Patent Application
20140294743
The present invention relates to new cosmetic and/or dermatological compositions for a topical use, in particular intended for controlling the darkening of the skin and/or preventing the photo-aging of keratinic materials in particular the skin under exposure of UV radiations comprising in a physiologically acceptable medium at least one merocyanine derivative comprising specific polar groups consisting of hydroxyl- and ether-functionalities of formula (1) or (2) which will be detailed below.
It relates also to cosmetic and/or dermatological compositions comprising in a physiologically acceptable medium at least one merocyanine of formula (1) or (2) and further a system for screening out both UVA radiation and UVB radiation
It is known that light radiation with wavelengths between 280 nm and 400 nm permits tanning of the human epidermis and that rays with wavelengths between 280 and 320 nm, which are known as UV-B rays, harm the development of a natural tan. This exposure is also susceptible to also induce an alteration of the biomechanical properties of epidermis which is expressed by the appearance of wrinkles leading to a premature ageing of the skin.
It is also known that UV-A rays, with wavelengths between 320 and 400 nm, penetrate more deeply into the skin than the UV-B rays. UV-A rays promote an immediate and persistent darkening of the skin. A daily exposure to the UVA radiation, even in a short time, in normal conditions, can generate a degradation of the collagen fibers and elastin which is expressed by a modification of the skin micro-relief, the appearance of wrinkles and an irregular pigmentation (ie brown spots, unhomogeneity of the complexion . . . ).
A protection against UVA and UVB radiations is therefore necessary. An efficient photoprotective product must protect both UVA and UVB radiations.
Many photoprotective cosmetic compositions for the skin have been proposed to date. They contain generally organic UV filters and inorganic UV filters which work according to their own chemical nature and according to their own physical properties by absorption, reflexion or diffusion of the UV radiations. They generally contain combinations of organic oil-soluble UV filters and/or organic water-soluble UV filters associated to metal oxide pigments as titanium dioxide (TiO2).
Many cosmetic compositions intended for limiting the darkening of the skin, improving the colour and the homogeneity of the complexion have been proposed to date. In order to obtain such compositions, it is well-known for a skilled man in the field of suncare products to use UV filters in particular UVB filters. Certain compositions may further contain UVA filters. This filtering system has to cover the UVB protection in order to limit and control the neo-synthesis of melanin promoting the global pigmentation but also has to cover the UVA protection in order to limit and control the oxidation of already present melanins leading to a darkening of the skin color.
But no composition contains a particular combination of UV filters which is specifically adapted to the photoprotection of the skin and particularly to an improvement of the quality of the skin both at the level of the colour and of its elasticity mechanical properties.
In an advantageous way, this improvement is particularly visible on already pigmented skins in order not to increase the pigmentary load in melanin neither the structure of the melanin which is already present into the skin.
In fact, most of the organic UV screening agents are aromatic compounds absorbing in the zone between 280 nm and 370 nm. Besides their filtering power of the solar radiation, the desired photoprotecting compounds must also present good cosmetic properties, a good solubility in usual solvents and in particular in fatty substances as oils, greases and also a good photostability alone and in association with other UV filters. They must be also colorless or at least present a cosmetically acceptable colour for the consumer.
One of the major drawbacks of those compositions known until this day is that those filtering systems are insufficiently photoprotective against UV radiations and particularly against long UVA radiations with wavelengths beyond 370 nm in order to control the photo-induced pigmentation and its evolution by an appropriate UV filtering system covering the whole UV spectrum.
Amongst all the compounds which were recommended for this effect, we can mention the particularly interesting UV filters family which consists in carbonated merocyanine derivatives which is disclosed in the U.S. Pat. No. 4,195,999 or the application WO2004/006878. Those compounds present very good filtering properties in the long UVA rays but have a little satisfactory solubility in usual solvents and in particular in fatty substances as the oils and a not satisfactory photostability for certain families of merocyanines
Therefore, there is still a need for finding new merocyanine compounds active in the long UVA which present good cosmetic properties, a good solubility in cosmetic oily or aqueous solvents, a good compatibility with other complementary UVA filters as the dibenzoylmethane derivatives, specifically regarding photostability and also a cosmetically acceptable colour for the consumer.
However, after considerable research conducted in the field of photoprotection mentioned above, the Applicant has now discovered, surprisingly, that this objective could be reached with a new family of merocyanine derivatives comprising specific polar groups consisting of hydroxyl- and ether-functionalities and corresponding to the formula (1) or (2) which will be detailed below.
This discovery forms the basis of the present invention.
A first object of the present invention relates to a cosmetic and/or dermatological composition comprising in a physiologically acceptable medium at least one merocyanine derivative of formula (1) or (2) which will be detailed below.
Another object of the present invention related to a cosmetic and/or dermatological composition comprising in a physiologically acceptable medium at least one merocyanine of formula (1) or (2) and further a system for screening out both UVA radiation and UVB radiation
Another object of the present invention related to a cosmetic and/or dermatological composition comprising in a physiologically acceptable medium at least one merocyanine derivative of formula (1) or (2) and at least one dibenzoylmethane derivative.
A third object of the present invention relates to a cosmetic process for controlling and/or improving the darkening of the skin under exposure to UV radiation and the homogeneity of the colour of the complexion which comprises the application onto the skin of a cosmetic composition as above defined.
Another object of the present invention relates to a cosmetic process for protecting the keratinic materials and particularly the skin against photo-ageing which comprises the application onto the keratinic material of a cosmetic composition as above defined.
Other characteristics, aspects and advantages of the present invention will emerge on reading the detailed description that follows.
The term “physiologically acceptable” means compatible with the skin and/or its integuments, which has a pleasant colour, odour and feel and which does not cause any unacceptable discomfort (stinging, tautness or redness) liable to put the consumer off using this composition.
The term “keratinic materials” includes the skin, the scalp, the hair, eyelashes, eyebrows and nails. In the rest of the present description, the expression “system for screening out both UVA radiation and UVB radiation” is intended to mean an agent for screening out UVA radiation with wavelengths between 320 and 400 nm and UVB radiation with wavelengths between 280 and 320 nm, constituted of either a mixture of several organic compounds and/or inorganic compounds for screening out said UV radiation, for example a mixture comprising a UVA screening agent and a UVB screening agent, or else an organic compound for screening out both UVA radiation and UVB radiation.
According to the present invention the merocyanine derivatives correspond to the following formula (1) or (2)
R1 and R2 independently of each other are hydrogen; C1-C22alkyl, C2-C22alkenyl, C2-C22alkinyl, which are optionally substituted by at least one hydroxy; or R1 and R2 together with the nitrogen atom linking them form a —(CH2)n— ring which is optionally interrupted by —O— or by —NH—;
R3 is a —(C═O)OR6group; or a —(CO)NHR6group;
R6 is C1-C22alkyl, C2-C22alkenyl, C2-C22alkinyl, C3-C22cycloalkyl or C3-C22cycloalkenyl, which is optionally substituted by one or more than one OH;
R4 and R5 are hydrogen; or R4 and R5 form a —(CH2)n— ring which is optionally substituted by C1-C4alkyl and/or interrupted by one or more than one —O— or by —NH—;
n is a number from 2 to 7;
R7 and R8 independently of each other are hydrogen; C1-C22alkyl, C2-C22alkenyl, C2-C22alkinyl, which is optionally interrupted by one or more than one O and/or substituted by one or more than one OH, C3-C22cycloalkyl or C3-C22cycloalkenyl, wherein said C3-C22cycloalkyl or C3-C22cycloalkenyl is optionally interrupted by one or more than one —O—;
or R7 and R8 together with the nitrogen atom linking them form a —(CH2)n— ring which is optionally interrupted by one or more than one —O—;
R9 and R10 are hydrogen; or R9 and R10 form a —(CH2)n— ring which is optionally substituted by C1-C4alkyl and/or interrupted by —O— or by —NH—;
R11 is C1-C22alkyl, C2-C22alkenyl, C2-C22alkinyl, C3-C22cycloalkyl or C3-C22cycloalkenyl, which is optionally interrupted by one or more than one 0; or C1-C22alkyl or C2-C22alkenyl which is substituted by C3-C22cycloalkyl or C3-C22cycloalkenyl, wherein said C3-C22cycloalkyl or C3-C22cycloalkenyl is optionally interrupted by one or more than one —O—;
with the proviso that
(I) at least one of R1, R2 and R6 is substituted by hydroxy;
(II) if one of R1 is hydroxyethyl, R2 is not hydrogen, methyl or ethyl or hydroxyethyl; and if R1 is hydrogen, R2 is not 1-hydroxy-3-methyl-but-2-yl;
(III) if R6 is substituted by one or more than one OH; one of R1 and R2 is C4-C22alkyl; or R1 and R2 together with the linking nitrogen form a piperidyl or morpholinyl radical;
(IV) at least one of R7 and R8, or R11 is interrupted by one or more than one —O—.
Preferred are compounds of formula (1) or (2), wherein
R1 and R2 independently of each other are hydrogen; C1-C22alkyl, C2-C22alkenyl, C2-C22alkinyl, which are optionally substituted by at least one hydroxy; or R1 and R2 together with the nitrogen atom linking them form a —(CH2)n— ring which is optionally interrupted by —O— or by —NH—;
R3 is a —(C═O)OR6group; or a —(CO)NHR6group;
R6 is C1-C22alkyl, C2-C22alkenyl, C2-C22alkinyl, C3-C22cycloalkyl or C3-C22cycloalkenyl, which is optionally substituted by one or more than one OH;
R4 and R5 are hydrogen; or R4 and R5 form a —(CH2)n— ring which is optionally substituted by C1-C4alkyl and/or interrupted by —O— or by —NH—;
n is a number from 2 to 7;
R7 and R8 independently of each other are hydrogen; C1-C22alkyl, C2-C22alkenyl, C2-C22alkinyl, which is optionally interrupted by one or more than one 0 and/or substituted by one or more than one OH; or R7 and R8 together with the nitrogen atom linking them form a —(CH2)n- ring which is optionally interrupted by one or more than one —O—;
R9 and R10 are hydrogen; or R9 and R10 form a —(CH2)n— ring which is optionally substituted by C1-C4alkyl and/or interrupted by —O— or by —NH—;
R11 is C1-C22alkyl, C2-C22alkenyl, C2-C22alkinyl, C3-C22cycloalkyl or C3-C22cycloalkenyl, which is optionally interrupted by one or more than one O;
with the proviso that
(I) at least one of R1, R2 and R6 is substituted by hydroxy;
(II) if one of R1 is hydroxyethyl, R2 is not hydrogen, methyl or ethyl or hydroxyethyl; and if R1 is hydrogen, R2 is not 1-hydroxy-3-methyl-but-2-yl;
(III) if R6 is substituted by one or more than one OH; one of R1 and R2 is C4-C22alkyl; or R1 and R2 together with the linking nitrogen form a piperidyl or morpholinyl radical;
(IV) at least one of R7 and R8, or R11 is interrupted by one or more than one —O—.
Preferred are compounds of formula (1) or (2), wherein R1 and R2 independently of each other are hydrogen; C4-C12alkyl; or hydroxy-C3-C12alkyl;
wherein at least one of R1 and R2 is hydroxy-C3-C12alkyl; and
R3, R4 and R5 are defined as in claim 1.
Preferred are also compounds of formula (1), wherein R6 is C8-C82alkyl, which is optionally substituted by one or more than one hydroxy.
More preferred are also compounds of formula (1), wherein
R6 is C1-C82alkyl which is substituted by one or more than one hydroxy;
one of R8 and R2 is C4-C22alkyl; or R8 and R2 together with the nitrogen atom linking them form a —(CH2)n-ring which is optionally interrupted by —O— and/or —NH—; and R4 and R5 and n are defined as in claim 1.
Preferred are compounds of formula (2), wherein
R11 is a radical of —(CH2)m—O—R12, wherein
R12 is C1-C12alkyl; or C1-C6alkoxy-C1-C6alkyl; m is a number from 1 to 5; and
R7, R8, R9, R10 and A are defined as in claim 1.
Even more preferred are compounds of formula (1) or (2) wherein
R1 and R2 and R7 and R8 respectively together with the linking nitrogen atom form a piperidyl radical or a morpholinyl radical.
Preferred are also compounds of formulas (1) and (2), wherein R4 and R5 and R9 and R10 respectively form a carbocyclic ring which contains 6 carbon atoms.
Most preferred are compounds of formula (1), wherein R1 and R2 independently of each other are hydrogen; or C1-C22alkyl; or hydroxy-C1-C22alkyl; or R1 and R2 together with the nitrogen atom are linked together to form a piperidyl or morpholinyl radical;
R3 is a —(C═O)OR6group; or a —(CO)NHR6group;
R6 is C1-C22alkyl, which may be substituted by one or more than one —OH;
R4 and R5 are hydrogen; or R4 and R5 are linked together to form a carbocyclic ring which contains 6 carbon atoms.
Most preferred are compounds of formula (1), wherein
R1 and R2 independently of each other are hydrogen; or hydroxy-C1-C22alkl; wherein at least one of R1 and R2 is hydroxy-C1-C22alkyl;
R3 is a —(C═O)OR6 group; or a —(C═O)NHR6 group; R6 is C1-C22alkyl; and
R4 and R5 are hydrogen; or R4 and R5 are linked together to form a carbocyclic ring which contains 6 carbon atoms.
Most preferred are compounds of formula (2), wherein R7 and R8 independently of each other are hydrogen or C1-C8alkyl, which is optionally interrupted by one or more than one —O—;
R11 is C1-C22alkyl; and
R9 and R10 are hydrogen; or R9 and R10 are linked together to form a carbocyclic ring which contains 6 carbon atoms.
Most preferred are compounds of formula (2), wherein
R7 and R8 together with the nitrogen atom form a morpholinyl or piperidyl radical;
R11 is C1-C22alkyl; which is interrupted by one or more than one —O—; and
R9 and R10 are hydrogen; or R9 and R10 are linked together to form a carbocyclic ring which contains 6 carbon atoms.
Even more preferred are compounds of formula (2), wherein
R11 is a radical of —(CH2)m—O—R12, wherein
R12 is C1-C4alkyl; or C1-C4alkoxy-C1-C4alkyl;
m is a number from 1 to 3;
R7 and R8, independently of each other are hydrogen; C1-C12alkyl, which is optionally interrupted by one or more than one O; or R7 and R8 together with the nitrogen atom form a morpholinyl or piperidyl radical;
R9 and R10 are hydrogen; or form a carbocyclic ring which contains 6 carbon atoms; and
The merocyanine compounds of the invention may be in the E/E-, E/Z- or Z/Z geometrical isomer forms.
Alkyl, cycloalkyl, alkenyl, alkylidene or cycloalkenyl may be straight chained or branched, monocyclic or polycyclic.
C1-C22alkyl is for example methyl, ethyl, n-propyl, isopropyl, n-butyl, sec.-butyl, isobutyl, tert.-butyl, n-pentyl, 2-pentyl, 3-pentyl, 2,2-dimethylpropyl, n-hexyl, n-octyl, 1,1,3,3-tetramethylbutyl, 2-ethylhexyl, nonyl, decyl, n-octadecyl, eicosyl or dodecyl.
Substituted alkyl is for example methoxyethyl, ethoxypropyl, 2-ethylhexyl, hydroxyethyl, chloropropyl, N,N-diethylaminopropyl, cyanoethyl, phenethyl, benzyl, p-tert-butylphenethyl, p-tert-octylphenoxyethyl, 3-(2,4-di-tert-amylphenoxy)-propyl, ethoxycarbonylmethyl-2-(2-hydroxyethoxy)ethyl or 2-furylethyl.
Hydroxysubstituted alkyl is for example hydroxymethyl, hydroxyethyl, hydroxypropyl, hydroxybutyl, hydroxypentyl, hydroxyhexyl, hydroxyheptyl, hydroxyoctyl, hydroxynonyl or hydroxydecyl.
C2-C22alkenyl is for example straight-chain C2-C12alkenyl or preferably branched C3-C12alkenyl. C1-C12alkyl, like vinyl, allyl, 2-propen-2-yl, 2-buten-1-yl, 3-buten-1-yl, 1,3-butadien-2-yl, 2-cyclobuten-1-yl, 2-penten-1-yl, 3-penten-2-yl, 2-methyl-1-buten-3-yl, 2-methyl-3-buten-2-yl, 3-methyl-2-buten-1-yl, 1,4-pentadien-3-yl, 2-cyclopenten-1-yl, 2-cyclohexen-1-yl, 3-cyclohexen-1-yl, 2,4-cyclohexadien-1-yl, 1-p-menthen-8-yl, 4(10)-thujen-10-yl, 2-norbornen-1-yl, 2,5-norbornadien-1-yl, 7,7-dimethyl-2,4-norcaradien-3-yl or the different isomers of hexenyl, octenyl, nonenyl, decenyl or dodecenyl.
C3-C12cycloalkyl is for example cyclopropyl, cyclobutyl, cyclopentyl, trimethylcyclohexyl or preferably cyclohexyl.
Examples of merocyanines according to the present invention are listed in Table A:
The most preferred merocyanines derivatives of the invention are selected in the group of the following compounds and their E/E-, E/Z- or Z/Z geometrical isomer forms:
According to a preferred embodiment of the invention, the compound 2-ethoxyethyl (2Z)-cyano{3-[(3-methoxypropyl)amino]cyclohex-2-en-1-ylidene}ethanoate (25) in its E/E and/or its E/Z geometrical isomer forms will be used.
The E/Z form has the following structure
The E/E form has the following structure
The Applicant discovered that those particular compounds have the following properties: better chemical stability after 2 months at 45° C. in ethanol/water 1/1 mixture at 0.5% of concentration, a less yellow coloring.
The merocyanine screening agent(s) in accordance with the invention may be present in the compositions according to the invention in a concentration from 0.1% to 10% and preferably from 0.2% to 5% by weight relative to the total weight of the composition
The compounds of formula (1) and (2) may be prepared according to known processes, as disclosed for example in J. Org. Chem. USSR (Engl. Transl.) 26(8), p. 1562f (1990); J. Heterocycl. Chem. 33(3), p. 763-766 (1996); Khimiya Geterotsiklicheskikh Soedinenii 11, p. 1537-1543 (1984); Khimiya Geterotsiklicheskikh Soedinenii 3, p. 397-404 (1982); Chem. Heterocycl. Comp. (Engl. Transl.) 24(8), 914-919 (1988) and in Synthetic Communications Vol. 33, No. 3, 2003, p 367-371.
The synthesis of the compounds used in the present invention is also disclosed in US2003/0181483A1, WO 0234710, Eur. J. Org. Chem. 2003, 2250-2253, J. Med. Chem. 1996, 39, 1112-1124 and J. Org. Chem., Vol. 37, No. 8, 1972, 1141-1145 as follows:
Vinylogene CH-acid compounds are reacted with acetales of amides.
In J. Heterocyclic Chem., 27, 1990, 1143-1151 aminoacrylic acid esters or aminoacrylnitriles are reacted with ethoxymethylenecyanoacetates in ethanol to the corresponding compounds used in the present invention.
Compounds of formula (1) and (2) wherein R4 and R5 or R9 and R10 together form a carbocyclic ring containing 6 C atoms, respectively, may be prepared according to procedures described in Pat. Appl. WO 2007/071582, in IP.com Journal (2009), 9(5A), 29-30 under the title “Process for producing 3-amino-2-cyclohexan-1-ylidene compounds” and in U.S. Pat. No. 4,749,643 on col, 13, line 66-col. 14, line 57 and the references cited therein.
The merocyanines of formula:
R′1 and R′2 independently of each other are hydrogen; C1-C22alkyl, C2-C22alkenyl, C2-C22alkinyl, which are optionally substituted by at least one hydroxy; or R′1 and R′2 together with the nitrogen atom linking them form a —(CH2)n- ring which is optionally interrupted by —O— or by —NH—;
R′3 is a —(C═O)OR′6group; or a —(CO)NHR′6group;
R′6 is C1-C22alkyl, C2-C22alkenyl, C2-C22alkinyl, C3-C22cycloalkyl or C3-C22cycloalkenyl, which is optionally substituted by one or more than one OH;
R′4 and R′5 are hydrogen; or R′4 and R′5 form a —(CH2)n— ring which is optionally substituted by C1-C4alkyl and/or interrupted by —O— or by —NH—;
n is a number from 2 to 7;
R′7 and R′8 independently of each other are hydrogen; C1-C22alkyl, C2-C22alkenyl, C2-C22alkinyl, which is optionally interrupted by one or more than one O and/or substituted by one or more than one OH; or R′7 and R′8 together with the nitrogen atom linking them form a —(CH2)n- ring which is optionally interrupted by —O—; R′9 and R′10 are hydrogen; or R′9 and R′10 form a —(CH2)n— ring which is optionally substituted by C1-C4alkyl and/or optionally interrupted by —O— or by —NH—;
R′11 is C1-C22alkyl, C2-C22alkenyl, C2-C22alkinyl, C3-C22cycloalkyl or C3-C22cycloalkenyl, which is optionally interrupted by one or more than one O;
are particularly suitable for protecting body care products from photolytic and oxidative degradation.
Preferably compounds of formula (1′) or (2′) are used wherein at least one of R1, R2, R3 and R6, R7 and R8, or R11 is substituted by hydroxy; and/or interrupted by one or more than one —O—.
Examples of compounds of formula (1′) and (2′) are those listed in Table A and the compound
According to the invention, the compositions may further contain one or more complementary hydrophilic, lipophilic or insoluble organic screening agents and/or one or more inorganic screening agents which are active in UVA and/or UVB radiations.
Examples of complementary UV filters that can be used in admixture with the compounds of formulas (1) and (2) are listed in the following Tables:
porphyra umbilicalis (INCI: Porphyra Umbilicalis) that are
Needless to say, a person skilled in the art will take care to select the optional additional screening agent(s) and/or the amounts thereof such that the advantageous properties intrinsically associated with the compositions in accordance with the invention are not, or are not substantially, adversely affected by the envisaged addition(s).
The additional organic screening agents are chosen more preferably from dibenzoylmethane derivatives; anthranilates; cinnamic derivatives; salicylic derivatives; camphor derivatives; benzophenone derivatives; β,β-diphenylacrylate derivatives; triazine derivatives; benzalmalonate derivatives, especially those mentioned in U.S. Pat. No. 5,624,663; benzimidazole derivatives; imidazolines; p-aminobenzoic acid (PABA) derivatives; benzotriazole derivatives; methylenebis-(hydroxyphenylbenzotriazole) derivatives as described in patent applications U.S. Pat. No. 5,237,071, U.S. Pat. No. 5,166,355, GB 2 303 549, DE 197 26 184 and EP 893 119; benzoxazole derivatives as described in patent applications EP 0 832 642, EP 1 027 883, EP 1 300 137 and DE 101 62 844; screening polymers and screening silicones such as those described especially in patent application WO 93/04665; a-alkylstyrene-based dimers, such as those described in patent application DE 198 55 649; 4,4-diarylbutadienes such as those described in patent applications EP 0 967 200, DE 197 46 654, DE 197 55 649, EP-A-1 008 586, EP 1 133 980 and EP 133 981; merocyanine derivatives such as those described in patent applications WO 04/006878, WO 05/058269 and WO 06/032741; the indanylidene screening agents of patents EP-A-0 823 418 and EP-A-1 341 752 and their mixtures.
As examples of organic UV-screening agents, mention may be made of those denoted hereinbelow under their INCI name:
Butylmethoxydibenzoylmethane, sold under the trade name Parsol 1789 by the company DSM Nutritional Products.
PABA,
Ethyl PABA,
Ethyl dihydroxypropyl PABA,
Ethylhexyl dimethyl PABA sold in particular under the name Escalol 507 by ISP,
Glyceryl PABA,
PEG-25 PABA sold under the name Uvinul P25 by BASF,
Homosalate sold under the name Eusolex HMS by Merck,
Ethylhexyl salicylate sold under the name Neo Heliopan OS by Symrise,
Dipropylene glycol salicylate sold under the name Dipsal by Lubrizol,
TEA salicylate sold under the name Neo Heliopan TS by Symrise.
Ethylhexyl methoxycinnamate sold especially under the trade name Parsol MCX by DSM Nutritional Products,
Isopropyl methoxycinnamate,
Isoamyl methoxycinnamate sold under the trade name Neo Heliopan E 1000 by Symrise,
Cinoxate,
DEA Methoxycinnamate,
Diisopropyl methylcinnamate,
Glyceryl ethylhexanoate dimethoxycinnamate
β,β-Diphenylacrylate derivatives:
Octocrylene sold especially under the trade name Uvinul N539 by BASF,
Etocrylene sold especially under the trade name Uvinul N35 by BASF,
Benzophenone-1 sold under the trade name Uvinul 400 by BASF,
Benzophenone-2 sold under the trade name Uvinul D50 by BASF,
Benzophenone-3 or Oxybenzone sold under the trade name Uvinul M40 by BASF,
Benzophenone-4 sold under the trade name Uvinul MS40 by BASF,
Benzophenone-5,
Benzophenone-6 sold under the trade name Helisorb 11 by Norquay,
Benzophenone-8 sold under the trade name Cyasorb UV-24 by Cytec,
Benzophenone-9 sold under the trade name Uvinul DS-49 by BASF,
Benzophenone-12,
n-hexyl 2-(4-diethylamino-2-hydroxybenzoyl)benzoate sold under the trade name Uvinul A+ or in the form of a mixture with octyl methoxycinnamate under the trade name Uvinul A+B by BASF,
1,1′-(1,4-piperazinediyl)bis[1-[2-[4-(diethylamino)-2-hydroxybenzoyl]phenyl]methanone (CAS 919803-06-8),
3-Benzylidenecamphor manufactured under the name Mexoryl SD by Chimex,
4-Methylbenzylidenecamphor sold under the name Eusolex 6300 by Merck,
Benzylidenecamphorsulfonic acid manufactured under the name Mexoryl SL by Chimex,
Camphor benzalkonium methosulfate manufactured under the name Mexoryl SO by Chimex,
Terephthalylidenedicamphorsulfonic acid manufactured under the name Mexoryl SX by Chimex,
Polyacrylamidomethylbenzylidenecamphor manufactured under the name Mexoryl SW by Chimex,
Phenylbenzimidazolesulfonic acid sold in particular under the trade name Eusolex 232 by Merck,
Disodium phenyl dibenzimidazole tetrasulfonate sold under the trade name Neo Heliopan AP by Symrise.
Drometrizole trisiloxane sold under the name Silatrizole by Rhodia Chimie, Methylenebis(benzotriazolyl)tetramethylbutylphenol sold in solid form under the trade name MIXXIM BB/100 by Fairmount Chemical, or in micronized form as an aqueous dispersion under the trade name Tinosorb M by BASF.
Bis(ethylhexyloxyphenol)methoxyphenyltriazine sold under the trade name Tinosorb S by BASF,
Ethylhexyltriazone sold in particular under the trade name Uvinul T150 by BASF,
Diethylhexylbutamidotriazone sold under the trade name Uvasorb HEB by Sigma 3V,
The silicone triazine substituted by two aminobenzoates groups as those disclosed in the patent EP0841341 in particular the compound 2,4-Bis(n-butyl 4′-aminobenzalmalonate)-6-[(3-{1,3,3,3-tetramethyl-1-[(trimethylsilyloxy]disiloxanyl}propyl)amino]-s-triazine, 2,4,6-Tris(diisobutyl 4′-aminobenzalmalonate)-s-triazine, 2,4,6-Tris(dineopentyl 4′-aminobenzalmalonate)-s-triazine, 2,4-Bis(dineopentyl 4′-aminobenzalmalonate)-6-(n-butyl 4′-aminobenzoate)-s-triazine,
the symmetrical triazine screening agents described in U.S. Pat. No. 6,225,467, patent application WO 2004/085412 (see compounds 6 and 9) or the document “Symmetrical Triazine Derivatives” IP.COM Journal, IP.COM INC West Henrietta, N.Y., US (20 Sep. 2004), especially 2,4,6-tris(biphenyl)-1,3,5-triazines (in particular 2,4,6-tris(biphenyl-4-yl-1,3,5-triazine) and 2,4,6-tris(terphenyl)-1,3,5-triazine which is also mentioned in Beiersdorf patent applications WO 06/035000, WO 06/034982, WO 06/034991, WO 06/035007, WO 2006/034992 and WO 2006/034985.
Menthyl anthranilate sold under the trade name Neo Heliopan MA by Symrise,
Ethylhexyl dimethoxybenzylidene dioxoimidazoline propionate,
Dineopentyl 4′-methoxybenzalmalonate, Polyorganosiloxane containing benzalmalonate functions, for instance Polysilicone-15, sold under the trade name Parsol SLX by DSM Nutritional Products.
1,1-Dicarboxy(2,2′-dimethylpropyl)-4,4-diphenylbutadiene,
2,4-Bis[5-1(dimethylpropyl)benzoxazol-2-yl-(4-phenyl)imino]-6-(2-ethylhexyl)imino-1,3,5-triazine, and mixtures thereof.
The most preferential additional organic screening agents are chosen from:
The additional organic UV-screening agents are preferably present in the compositions according to the invention in proportions ranging from 0.01% to 20% by weight relative to the total weight of the composition, and preferably ranging from 0.1% to 15% by weight relative to the total weight of the composition.
The additional mineral screening agents are chosen from coated or uncoated metal oxide pigments in which the mean size of the primary particles is preferentially between 5 nm and 100 nm (preferably between 10 nm and 50 nm), for instance titanium oxide (amorphous or crystallized in rutile and/or anatase form), iron oxide, zinc oxide, zirconium oxide or cerium oxide pigments, which are all UV-photoprotective agents that are well known per se.
The pigments may be coated or uncoated.
The coated pigments are pigments that have undergone one or more surface treatments of chemical, electronic, mechanochemical and/or mechanical nature with compounds as described, for example, in Cosmetics & Toiletries, February 1990, Vol. 105, pp. 53-64, such as amino acids, beeswax, fatty acids, fatty alcohols, anionic surfactants, lecithins, sodium, potassium, zinc, iron or aluminium salts of fatty acids, metal alkoxides (titanium or aluminium alkoxides), polyethylene, silicones, proteins (collagen, elastin), alkanolamines, silicon oxides, metal oxides or sodium hexametaphosphate.
As is known, silicones are organosilicon polymers or oligomers of linear or cyclic, branched or crosslinked structure, of variable molecular weight, obtained by polymerization and/or polycondensation of suitably functionalized silanes, and consist essentially of a repetition of main units in which the silicon atoms are linked together via oxygen atoms (siloxane bond), optionally substituted hydrocarbon-based radicals being directly attached via a carbon atom to the said silicon atoms.
The term “silicones” also includes the silanes required for their preparation, in particular alkylsilanes.
The silicones used for the coating of the pigments suitable for the present invention are preferably chosen from the group consisting of alkylsilanes, polydialkylsiloxanes and polyalkylhydrosiloxanes. More preferably still, the silicones are chosen from the group containing octyltrimethylsilane, polydimethylsiloxanes and polymethylhydrosiloxanes.
Of course, before being treated with silicones, the metal oxide pigments may have been treated with other surface agents, in particular with cerium oxide, alumina, silica, aluminium compounds or silicon compounds, or mixtures thereof.
Such metal oxide pigments, coated or non coated are in particular disclosed in the patent application EP-A-0 518 773. As commercial pigments, we can mention the products sold by the companies Sachtleben, Tayca, Merck et Evonik.
The coated pigments are more particularly titanium oxides that have been coated:
The uncoated titanium oxide pigments are sold, for example, by the company Tayca under the trade names “Microtitanium Dioxide MT 500 B” or “Microtitanium Dioxide MT 600 B”, by the company EVONIK under the name P 25, by the company Wacker under the name Transparent titanium oxide PW, by the company Miyoshi Kasei under the name UFTR, by the company Tomen under the name ITS and by the company CRODA under the name Tioveil AQ.
The uncoated zinc oxide pigments are, for example:
The coated zinc oxide pigments are, for example:
Elementis (ZnO dispersed at a concentration of 55% in C12-C15 alkyl benzoate with hydroxystearic acid polycondensate).
The uncoated cerium oxide pigments are sold, for example, under the name Colloidal Cerium Oxide by the company RHODIA.
The uncoated iron oxide pigments are sold, for example, by the company Arnaud under the names Nanogard WCD 2002 (FE 45B), Nanogard Iron FE 45 BL AQ, Nanogard FE 45R AQ and Nanogard WCD 2006 (FE 45R) or by the company Mitsubishi under the name TY-220,
The coated iron oxide pigments are sold, for example, by the company Arnaud under the names Nanogard WCD 2008 (FE 45B FN), Nanogard WCD 2009 (FE 45B 556), Nanogard FE 45 BL 345 and Nanogard FE 45 BL or by the company BASF under the name TRANSPARENT IRON OXIDE.
Mention may also be made of mixtures of metal oxides, especially of titanium dioxide and of cerium dioxide, including the silica-coated equal-weight mixture of titanium dioxide and of cerium dioxide, sold by the company IKEDA under the name Sunveil A, and also the alumina, silica and silicone-coated mixture of titanium dioxide and of zinc dioxide, such as the product M 261 sold by the company SACHTLEBEN, or the alumina, silica and glycerol-coated mixture of titanium dioxide and of zinc dioxide, such as the product M 211 sold by the company SACHTLEBEN.
According to the invention, coated or uncoated titanium oxide pigments are particularly preferred.
The inorganic UV filters according represents generally from 0.5 to 40%, preferably from 1 to 30%, by weight relating to the total weight of the composition.
According to their lipophilic character or their hydrophilic character, more or less pronounced, inorganic UV filters may be present in the oily phase, in the aqueous phase or in the two phases in an emulsion.
A particular form of the present invention relates to a composition comprising in a cosmetically acceptable medium at least one merocyanine derivative of formula (1) or (2) and at least one dibenzoylmethane derivative.
Among the dibenzoylmethane derivatives that may especially be mentioned, in a non-limiting manner, are:
It is most particularly preferred to use 4-(tert-butyl)-4′-methoxydibenzoylmethane or Butyl Methoxy Dibenzoylmethane or Avobenzone, sold under the trade name Parsol 1789 by the company DSM Nutritional Products, Inc.; this screening agent corresponds to the following formula:
The dibenzoylmethane derivative(s) may be present in the compositions in accordance with the invention in contents preferably ranging from 0.01% to 20% by weight, more preferentially from 0.1% to 10% by weight and even more preferentially from 0.1% to 6% by weight relative to the total weight of the composition.
A particular form of the present invention relates to a composition comprising in a cosmetically acceptable medium at least the compound 2-ethoxyethyl (2Z)-cyano{3-[(3-methoxypropyl)amino]cyclohex-2-en-1-ylidene}ethanoate (25) in its E/E and/or E/Z geometrical isomer forms and a dibenzoylmethane derivative as above defined and particularly the 4-(tert-butyl)-4′-methoxydibenzoylmethane or Butyl Methoxy Dibenzoylmethane or Avobenzone.
The aqueous compositions in accordance with the present invention may also comprise standard cosmetic adjuvants chosen especially from fatty substances, organic solvents, ionic or nonionic, hydrophilic or lipophilic thickeners, softeners, humectants, opacifiers, stabilizers, emollients, silicones, antifoams, fragrances, preserving agents, anionic, cationic, nonionic, zwitterionic or amphoteric surfactants, active agents, fillers, polymers, propellants, acidifying or basifying agents or any other ingredient usually used in cosmetics and/or dermatology.
The fatty substances may consist of an oil or a wax other than the apolar waxes as defined above, or mixtures thereof. The term oil means a compound that is liquid at room temperature. The term wax means a compound that is solid or substantially solid at room temperature and whose melting point is generally greater than 35° C.
Oils that may be mentioned include mineral oils (paraffin); plant oils (sweet almond oil, macadamia oil, blackcurrant seed oil or jojoba oil); synthetic oils, for instance perhydrosqualene, fatty alcohols, fatty amides (for instance isopropyl lauroyl sarcosinate sold under the name Eldew SL-205 by the company Ajinomoto), fatty acids or fatty esters, for instance the C12-C15 alkyl benzoate sold under the trade name Finsolv TN or Witconol TN by the company Witco, 2-ethylphenyl benzoate, for instance the commercial product sold under the name X-Tend 226® by the company ISP, octyl palmitate, isopropyl lanolate, diisopropyl sebacate sold under the trade name Dub Dis by the company Stearinerie Dubois and triglycerides, including capric/caprylic acid triglycerides, and dicaprylyl carbonate sold under the name Cetiol CC by the company Cognis, oxyethylenated or oxypropylenated fatty esters and ethers; silicone oils (cyclomethicone and polydimethylsiloxanes, or PDMS) or fluoro oils, polyalkylenes, and trialkyl trimellitates such as tridecyl trimellitate.
Waxy compounds that may be mentioned include carnauba wax, beeswax, hydrogenated castor oil, polyethylene waxes and polymethylene waxes, for instance the product sold under the name Cirebelle 303 by the company Sasol.
Among the organic solvents that may be mentioned are lower alcohols and polyols. These polyols may be chosen from glycols and glycol ethers, for instance ethylene glycol, propylene glycol, butylene glycol, caprylyl glycol, pentyleneglycol, dipropylene glycol or diethylene glycol.
A particularly interesting family of solvents that may be also mentioned includes the 4-carboxy-2-pyrrolidinone ester derivatives of formula (I), alone or as a mixture, and/or a salt and/or isomer and/or solvate thereof:
in which:
In formula (I), among the alkyl groups, mention may in particular be made of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-octyl, 2-ethylhexyl, dodecyl, hexadecyl, cyclohexyl or methylcyclohexyl groups.
The salts of the compounds described in the present invention comprise the conventional nontoxic salts of said compounds, such as those formed from cosmetically acceptable organic or inorganic acids or bases. Mention may be made of ammonium salts, alkanolamine salts such as triethanolamine salts, aminopropanediol salts, and salts of alkali metals or alkaline-earth metals, such as sodium, potassium, magnesium and calcium.
The preferred compounds are those of formula (I) in which R3 and R4 are hydrogen.
Preferably, R1 denotes a hydrogen atom or a linear C1-C18 or branched C3-C18 alkyl radical; and better still a linear C2-C18 or branched C3-C10 alkyl radical.
Preferably, R2 denotes a linear C2-C18 or branched C3-C18 alkyl radical; and better still a linear C3-C16 or branched C3-C12 alkyl radical; or a cyclohexyl, phenyl, benzyl or phenethyl radical; most preferably, R2 denotes a linear C4-C10 or branched C4-C10 alkyl radical; such as butyl and 2-ethylhexyl.
Among the compounds of formula (I), use will more particularly be made of the following products (a) to (bx):
The counterions indicated can be replaced by any organic or inorganic, cosmetically acceptable cationic counterion, preferably chosen from inorganic cations of alkali metals or alkaline-earth metals, such as Na, Mg, K and Ca, and organic cations such as ammonium NR4+, with R, which may be identical or different, representing H or a C1-C6 (hydroxy)alkyl.
The compounds which are even more preferred are the compounds of formulae (l), (n), (o), (ac), (am), (at), (au), (av), (ba), (bg), (bl), (bm), (bp), (br), (bw) and (bx).
The compounds of formula (I) can be obtained according to the syntheses described in the following articles: J. Org. Chem., 26, pages 1519-24 (1961); Tetrahedron Asymmetric, 12 (23), pages 3241-9 (2001); J. Industrial & Engineering Chem., 47, pages 1572-8 (1955); J. Am. Chem. Soc., 60, pages 402-6 (1938); and in patents EP0069512, U.S. Pat. No. 2,811,496, U.S. Pat. No. 2,826,588, U.S. Pat. No. 3,136,620, FR2290199 and FR2696744.
The compounds of formula (I) are preferably present, alone or as a mixture, in the cosmetic compositions according to the invention in an amount of from 0.5% to 40% by weight
Hydrophilic thickeners that may be mentioned include carboxyvinyl polymers such as the Carbopol products (carbomers) and the Pemulen products (acrylate/C10-C30-alkylacrylate copolymer); Caprylic/Capric Triglyceride and Sodium Acrylates Copolymer (Luvigel EM-BASF); polyacrylamides, for instance the crosslinked copolymers sold under the names Sepigel 305 (CTFA name: polyacrylamide/C13-14 isoparaffin/Laureth 7) or Simulgel 600 (CTFA name: acrylamide/sodium acryloyldimethyl taurate copolymer/isohexadecane/polysorbate 80) by the company SEPPIC; 2-acrylamido-2-methylpropanesulphonic acid polymers and copolymers, optionally crosslinked and/or neutralized, for instance poly(2-acrylamido-2-methylpropanesulphonic acid) sold by the company Clariant under the trade name Hostacerin AMPS (CTFA name: ammonium polyacryloyl dimethyl taurate or Simulgel 800 sold by the company SEPPIC (CTFA name: sodium polyacryolyl dimethyl taurate/polysorbate 80/sorbitan oleate); copolymers of 2-acrylamido-2-methylpropane sulphonic acid and of hydroxyethyl acrylate, for instance Simulgel NS and Sepinov EMT 10 sold by the company SEPPIC; cellulose derivatives such as hydroxyethyl cellulose; polysaccharides and especially gums such as xanthan gum; water-soluble or water-dispersible silicone derivatives, for instance acrylic silicones, polyether silicones and cationic silicones, and mixtures thereof.
Lipophilic thickeners that may be mentioned include synthetic polymers, such as the poly(C10-C30 alkyl acrylates) sold under the names Intelimer IPA 13-1 and Intelimer IPA 13-6 by the company Landec, or modified clays, such as hectorite and its derivatives, for instance the products sold under the name Bentone.
Of course, a person skilled in the art will take care to select the optional additional compound(s) mentioned above and/or the amounts thereof such that the advantageous properties intrinsically associated with the compositions in accordance with the invention are not, or are not substantially, adversely affected by the envisaged addition(s).
The compositions according to the invention may be prepared according to the techniques that are well known to those skilled in the art. They may in particular be in the form of a simple or complex emulsion (O/W, W/O, O/W/O or W/O/W) such as a cream, a milk or a cream-gel; in the form of an aqueous gel; in the form of a lotion; in the form of anhydrous oil; They may optionally be packaged as an aerosol and may be in the form of a mousse or a spray.
The compositions according to the invention are preferably in the form of an oil-in-water or water-in-oil emulsion.
The emulsification processes that may be used are of the paddle or impeller, rotor-stator or HHP type.
It is also possible, via HHP (between 50 and 800 bar), to obtain stable dispersions with droplet sizes that may be as low as 100 nm.
The emulsions generally contain at least one emulsifier chosen from amphoteric, anionic, cationic and nonionic emulsifiers, used alone or as a mixture. The emulsifiers are appropriately chosen according to the emulsion to be obtained (W/O or O/W).
As emulsifying surfactants that may be used for the preparation of the W/O emulsions, examples that may be mentioned include sorbitan, glycerol or sugar alkyl esters or ethers; silicone surfactants, for instance dimethicone copolyols, such as the mixture of cyclomethicone and of dimethicone copolyol, sold under the name DC 5225 C by the company Dow Corning, and alkyldimethicone copolyols such as laurylmethicone copolyol sold under the name Dow Corning 5200 Formulation Aid by the company Dow Corning; cetyldimethicone copolyol, such as the product sold under the name Abil EM 90R by the company Evonik, and the mixture of cetyldimethicone copolyol, of polyglyceryl isostearate (4 mol) and of hexyl laurate, sold under the name Abil WE 09 by the company Evonik. One or more co-emulsifiers may also be added thereto, which may be chosen advantageously from the group comprising polyol alkyl esters.
Polyol alkyl esters that may especially be mentioned include polyethylene glycol esters, for instance PEG-30 dipolyhydroxystearate, such as the product sold under the name Arlacel P135 by the company Croda.
Glycerol and/or sorbitan esters that may especially be mentioned include, for example, polyglyceryl isostearate, such as the product sold under the name Isolan GI 34 by the company Evonik, sorbitan isostearate, such as the product sold under the name Arlacel 987 by the company Croda, sorbitan glyceryl isostearate, such as the product sold under the name Arlacel 986 by the company Croda, and mixtures thereof.
Emulsifying polyoxyalkylenated silicone elastomers may especially be also mentioned as those disclosed in the documents U.S. Pat. No. 5,236,986, U.S. Pat. No. 5,412,004, U.S. Pat. No. 5,837,793, U.S. Pat. No. 5,811,487. Those silicone elastomers are preferably formulated under the form of a gel in a hydrocarbonated and/or a silicone oil. In those gels, the polyoxyalkylenated silicone elastomer is often under the form of spherical particles.
As example of polyoxyethylenated silicone elastomer, may be mentioned those sold by the company Shin Etsu, with the denominations:
Dimethicone/PEG-10 Dimethicone vinyl dimethicone crosspolymer), or those sold by the company Dow Corning under the commercial names:
Those products are generally in the form of oily gel containing the particles of silicone elastomer.
Preferably, KSG-210 is used (INCI name: Dimethicone/PEG-10/15 crosspolymer) which is at 25% in active material of silicone elastomer in a silicone oil.
Amongst water/oil emulsifiers, may be mentioned also the polyglycerolated silicone elastomers as those disclosed in the document WO-A-2004/024798.
As example of polyglycerolated silicone elastomers, may be mentioned those sold par the company Shin Etsu, with the denominations:
For the O/W emulsions, examples of emulsifiers that may be mentioned include nonionic emulsifiers such as oxyalkylenated (more particularly polyoxyethylenated) fatty acid esters of glycerol; oxyalkylenated fatty acid esters of sorbitan; oxyalkylenated (oxyethylenated and/or oxypropylenated) fatty acid esters, for instance the mixture PEG-100 stearate/glyceryl stearate sold, for example, by the company Croda under the name Arlacel 165; oxyalkylenated (oxyethylenated and/or oxypropylenated) fatty alkyl ethers; sugar esters, for instance sucrose stearate; fatty alkyl ethers of sugars, especially alkyl polyglucosides (APG) such as decylglucoside and laurylglucoside sold, for example, by the company Cognis under the respective names Plantaren 2000 and Plantaren 1200, cetostearyl glucoside optionally as a mixture with cetostearyl alcohol, sold, for example, under the name Montanov 68 by the company SEPPIC, under the name Tegocare CG90 by the company Evonik and under the name Emulgade KE3302 by the company Cognis, and also arachidyl glucoside, for example in the form of a mixture of arachidyl alcohol, behenyl alcohol and arachidyl glucoside, sold under the name Montanov 202 by the company SEPPIC. According to a specific embodiment of the invention, the mixture of the alkyl polyglucoside as defined above with the corresponding fatty alcohol can be in the form of a self-emulsifying composition, for example as disclosed in the document WO-A-92/06778; the hydrophobically modified inulines as Inuline Lauryl Carbamate as the product sold under the denomination INUTEC SP1 by the Company Beneo-ORAFTI.
According to a specific embodiment of the invention, the composition may also contain at least an emulsifier chosen among dimers surfactants named <<gemini surfactants>> and comprising two surfactant moieties identical or different, and constituted by an hydrophilic head group and a lipophilic linked to each others through the head groups, thanks to a spacer. Such surfactants are described in the patents DE19943681, DE19943668, DE 42 27 391 et DE 196 08 117; JP-A-11-60437; JP-A-8-311003; EP 0 697 244; EP0 697 245; EP0708 079; DE19622612 and JP-A 10-17593; WO 03024412, US5863 886; WO96/25388; WO96/14926; WO 96/16930, WO 96/25384WO9740124; WO9731890; DE19750246; DE 19750245; DE 19631225; DE 19647060. In order to have a more detailed description of the chemical structures and physico-chemical properties, one can refer to the following publications: Milton J. Rosen, Gemini Surfactants, Properties of surfactant molecules with two hydrophilic groups and two hydrophobic groups, Cosmetics & Toiletries magazine, vol. 113, December 1998, pages 49-55, Milton J. Rosen, Recent Developments in Gemini Surfactants, Allured's Cosmetics & Toiletries magazine, July 2001, vol 116, no 7, pages 67-70.
Among the dimers surfactant described above, the preferred compounds of the invention are anionic surfactants characterized by the following formula (I)
where
R1 and R3 represent a C8-C16 linear alkyl group,
R2 represents a C2-C8 alkylene group,
X and Y represent an (C2H4O)x-RF with x=10-15, and RF═—SO3M group where M represent an alkaline atom.
A preferred gemini surfactant is an anionic compound Sodium Dicocoyl ethylene diamine PEG-15 Sulfate (nom INCI) with formula:
One can use for example this gemini surfactant in the commercialized mixtures sold by Sasol company under the name CERALUTION®:
The preferred gemini surfactant is the mixture of Behenyl Alcohol, Glyceryl Stearate, Glyceryl Stearate Citrate and Sodium Dicocoyl ethylenediamine PEG-15 Sulfate (Ceralution® H).
Among other emulsifiers, may be used isophthalic acid polymers or sulfo isophthalic acid polymers, and specifically copolymers of phthalate/sulfo isophthalate/glycol as for example Diethylene Glycol/Phthalate/Isophthalate/1,4-cyclohexane-dimethanol copolymer (INCI name: Polyester-5sol under the name <<Eastman AQ polymer>> (AQ35S, AQ38S, AQ55S, AQ48 Ultra) by the company Eastman Chemical.
Among other emulsifiers, amphiphilic copolymers of 2-acrylamido 2-methylpropane sulfonic acid as those described in the patent EP1069142, can be used. The preferred amphiphilic AMPS copolymers are AMMONIUM ACRYLOYLDIMETHYLTAURATE/STEARETH-25 METHACRYLATE CROSSPOLYMER sold under the name Aristoflex HMS by the Company Clariant, AMMONIUM ACRYLOYLDIMETHYLTAURATE/STEARETH-8 METHACRYLATE COPOLYMER sold under the name Aristoflex SNC by the company Clariant.
When it is an emulsion, the aqueous phase of this emulsion may comprise a nonionic vesicular dispersion prepared according to known processes (Bangham, Standish and Watkins, J. Mol. Biol. 13, 238 (1965), FR 2 315 991 and FR 2 416 008).
The compositions of the invention may also contain at least one crosslinked non-emulsifying elastomer organo polysiloxane.
The term non-emulsifying elastomer organo polysiloxane
means an emulsifying elastomer organo polysiloxane which does not contain any hydrophilic chain as polyoxyalkylenated or polyglycerolated units.
Preferably, the non-emulsifying elastomer organo polysiloxane is obtained by addition reaction (a) of diorgano polysiloxane containing at least two hydrogen atoms each linked to a silicium atom and (b) of diorgano polysiloxane having at least two insaturated ethylenic groups linked to the silicium atom, in particular in presence (c) of a platinium catalyst as disclosed in the application EP-A-295886.
According to particular form of the invention, the non-emulsifying elastomer organopolysiloxane is under the form of powder.
As examples of non-emulsifying elastomer organopolysiloxanes under the form of powder, may be used those having the INCI name: DIMETHICONE/VINYL DIMETHICONE CROSSPOLYMER as the commercial products sold under the names “DOW CORNING 9505 COSMETIC POWDER”, “DOW CORNING 9506 COSMETIC POWDER” by the company DOW CORNING.
According a preferred embodiment of the invention, the non-emulsifying elastomer organopolysiloxane is mixed with at least one volatile or non-volatile hydrocarbonated and/or volatile or non-volatile silicone oil for forming a gel.
As examples of mixtures of oil/non-emulsifying elastomer organopolysiloxane, may be used those having the following INCI names:
DIMETHICONE AND DIMETHICONE/VINYL DIMETHICONECROSSPOLYMER as the commercial products sold under the name KSG6
,
KSG16
by the company SHIN ETSU,
The compositions according to the invention find their application in a large number of treatments, especially cosmetic treatments, of the skin, the lips and the hair, including the scalp, especially for protecting and/or caring for the skin, the lips and/or the hair, and/or for making up the skin and/or the lips.
Another object of the present invention consists of the use of the compositions according to the invention as defined above for the manufacture of cosmetic products for treating the skin, the lips, the nails, the hair, the eyelashes, the eyebrows and/or the scalp, especially care products, antisun protection products and makeup products.
The cosmetic compositions according to the invention may be used, for example, as makeup products.
The cosmetic compositions according to the invention may be used, for example, as care products and/or antisun protection products for the face and/or the body, of liquid to semi-liquid consistency, such as milks, more or less rich creams, cream-gels and pastes. They may optionally be packaged as an aerosol and may be in the form of a mousse or a spray.
The compositions according to the invention in the form of vaporizable fluid lotions in accordance with the invention are applied to the skin or the hair in the form of fine particles by means of pressurization devices. The devices in accordance with the invention are well known to those skilled in the art and comprise non-aerosol pumps or “atomizers”, aerosol containers comprising a propellant and also aerosol pumps using compressed air as propellant. These devices are described in patents U.S. Pat. No. 4,077,441 and U.S. Pat. No. 4,850,517.
The compositions conditioned in aerosol form in accordance with the invention generally contain conventional propellants, for instance hydrofluoro compounds, dichlorodifluoromethane, difluoroethane, dimethyl ether, isobutane, n-butane, propane or trichlorofluoromethane. They are preferably present in amounts ranging from 15% to 50% by weight relative to the total weight of the composition.
The compositions according to the invention may additionally, further, comprise additional cosmetic and dermatological active agents.
It will be possible especially to choose the additional active agents from moisturizers, desquamating agents, agents for improving the barrier function, depigmenting agents, antioxidants, dermo-decontracting agents, anti-glycation agents, agents for stimulating the synthesis of dermal and/or epidermal macromolecules and/or for preventing their degradation, agents for stimulating fibroblast or keratinocyte proliferation and/or keratinocyte differentiation, agents for promoting the maturation of the horny envelope, NO-synthase inhibitors, peripheral benzodiazepine receptor (PBR) antagonists, agents for increasing the activity of the sebaceous glands, agents for stimulating the energy metabolism of cells, tensioning agents, lipid restructuring agents, slimming agents, agents for promoting the cutaneous microcirculation, calmatives and/or anti-irritants, sebo-regulating or anti-seborrhoeic agents, astringents, cicatrizing agents, anti-inflammatory agents, anti-acne agents and agents which promote natural colouring of the skin.
A person skilled in the art will select the said active agent or agents as a function of the desired effect on the skin, hair, eyelashes, eyebrows or nails.
For caring for and/or making up skin which has aged, he or she will preferably select at least one active agent chosen from moisturizers, desquamating agents, agents for improving the barrier function, depigmenting agents, antioxidants, dermo-decontracting agents, anti-glycation agents, agents for stimulating the synthesis of dermal and/or epidermal macromolecules and/or for preventing their degradation, agents for stimulating fibroblast or keratinocyte proliferation and/or keratinocyte differentiation, agents for promoting the maturation of the horny envelope, NO-synthase inhibitors, peripheral benzodiazepine receptor (PBR) antagonists, agents for increasing the activity of the sebaceous glands, agents for stimulating the energy metabolism of cells, lipid restructuring agents, agents promoting the cutaneous microcirculation for the area around the eyes and agents which promote the natural colouring of the skin.
For caring for and/or making up greasy skin, the person skilled in the art will preferably select at least one active agent chosen from desquamating agents, sebo-regulating or antiseborrhoeic agents and astringents. According to a preferred embodiment, the cosmetic and/or dermatological active is a Depigmenting agent.
As depigmenting agents that can be used in accordance with the present invention, mention may in particular be made of vitamin C and derivatives thereof, and in particular vitamin CG, vitamin CP and 3-O ethyl vitamin C; arbutin and derivatives thereof, such as those described in applications EP895779 and EP524109, for instance alpha- and beta-arbutin; hydroquinone; aminophenol derivatives such as those described in applications WO 99/10318 and WO 99/32077, and in particular N-cholesteryl oxycarbonyl-para-aminophenol and N-ethyloxycarbonyl-para-aminophenol; iminophenol derivatives such as those described in application WO 99/22707; L-2-oxothiazolidine-4-carboxylic acid or procysteine and also salts or esters thereof; ferulic acid; lucinol and derivatives thereof; kojic acid; resorcinol and esters thereof; tranexamic acid and esters thereof; gentisic acid, homogentisate, or methyl gentisate or homogentisate; dioic acid; calcium D-pantethein sulphonate; lipoic acid; ellagic acid; vitamin B3; linoleic acid and derivatives thereof; ceramides and homologues thereof; derivatives of plants, for instance camomile, bearberry, the aloe family (vera, ferox, bardensis), mulberry or skullcap; a kiwi fruit (Actinidia chinensis) juice sold by Gattefosse; an extract of Paeonia suffructicosa root, such as the product sold by the company Ichimaru Pharcos under the name Botanpi Liquid B®, an extract of brown sugar (Saccharum officinarum), such as the extract of molasses sold by the company Taiyo Kagaku under the name Molasses Liquid, without this list being exhaustive. Mention may also be made of biphenyl compounds such as magnolol, honokiol, magnolignan, etc,
We can also mention hydroxylated diphenylmethane derivatives as those described in application WO 2004/105736 and particularly the compound of structure:
known as 4-(1-phenylethyl)-1,3-benzenediol or 4-(1-phenylethyl)-1,3-dihydroxybenzene or otherwise known as phenylethyl resorcinol or phenylethylbenzenediol or styryl resorcinol. This compound has a CAS number 85-27-8. Such a compound is sold under the name Symwhite 377® by the company Symrise.
Mention may be made especially of:
The self-tanning agents may be chosen from
The DHA may be used in free and/or encapsulated form, for example in lipid vesicles such as liposomes, especially described in patent application WO 97/25970.
In general, the self-tanning agent is present in an amount ranging from 0.01% to 20% by weight and preferably in an amount of between 0.1% and 10% of the total weight of the composition.
Other dyes that allow modification of the colour produced by the self-tanning agent may also be used.
These dyes may be chosen from synthetic or natural direct dyes.
These dyes may be chosen, for example, from red or orange dyes of the fluoran type such as those described in patent application FR 2 840 806. Mention may be made, for example, of the following dyes:
Acid Red 51;
These dyes may also be chosen from anthraquinones, caramel, carmine, carbon black, azulene blues, methoxalene, trioxalene, guajazulene, chamuzulene, Bengal rose, cosin 10B, cyanosin and daphinin.
These dyes may also be chosen from indole derivatives, for instance the monohydroxyindoles as described in patent FR 2 651 126 (i.e.: 4-, 5-, 6- or 7-hydroxy-indole) or the dihydroxyindoles as described in patent EP-B-0 425 324 (i.e.: 5,6-dihydroxyindole, 2-methyl-5,6-dihydroxyindole, 3-methyl-5,6-dihydroxyindole or 2,3-dimethyl-5,6-dihydroxyindole).
The cosmetic and/or dermatological active agents will be present in one of the compositions according to the invention in a content ranging from 0.001% to 20% by weight relative to the total weight of the composition, preferably from 0.01% to 10%, more preferably still from 0.5 to 5% and more preferably from 0.1 to 1% by weight relative to the total weight of the composition.
The following photoprotective formulations were produced; the amounts are given as weight percentages relating to the total weight of the composition.
55.33 grams of bis-(2-methoxyethyl)amine are reacted with 1,1,3,3-tetramethoxypropane in acetic acid, concentrated and treated with 21.48 grams of ethyl cyanoacetate in the presence of an organic base and a solvent.
The following base/solvent combinations are used:
The reaction temperature is between 0° C. and the boiling point of the solvent.
The reaction end point is confirmed by thin layer chromatography or high performance liquid chromatography.
After the reaction, the product (101) is obtained from the reaction mixture through ordinary product isolation by liquid-liquid separation, column chromatography or crystallization by addition of a poor solvent to the reaction mixture.
The desired product (1) is obtained in yields of 66% (36 grams) as a dark brownish oil which crystallized as yellow crystals (Melting point: 76.9° C.)
55.33 grams of bis-(2-methoxyethyl)amine are condensed with 1,1,3,3-tetramethoxypropane in acetic acid, concentrated and treated with 27.18 grams of 2-methoxyethyl-cyanoacetate in the presence of an organic base and a solvent.
The following base/solvent combinations are used:
After the reaction, the product (102) is obtained from the reaction mixture through silica gel column chromatography (eluent: toluene/acetone).
The desired product (2) is obtained in yields of 75% (45.44 grams) as a yellow powder (melting point: 92.2° C.)
55.33 grams of bis-(2-methoxyethyl)amine are condensed with 1,1,3,3-tetramethoxypropane in acetic acid, concentrated and treated with 29.85 grams of 2-ethoxyethyl-cyanoacetate in the presence of an organic base and a solvent
The following base/solvent combinations are used:
After the reaction, the product (103) is obtained from the reaction mixture through ordinary product isolation by liquid-liquid separation, column chromatography or crystallization by addition of a poor solvent to the reaction mixture.
The desired product (103) is obtained in yields of 66% (39.99 grams) as beige crystals (melting point: 58.3° C.)
70.67 grams of piperidine are condensed with 1,1,3,3-tetramethoxypropane in acetic acid, concentrated and treated with 59.72 grams of 2-ethoxyethyl cyanoacetate cyanoacetate in the presence of an organic base and a solvent.
The following base/solvent combinations are used:
After silica gel column chromatography (eluent: toluene/acetone) the pure product is obtained yielding dark yellow crystals. Melting point: 66-67° C.
132.83 grams of piperidine are condensed with 1,1,3,3-tetramethoxypropane in acetic acid, concentrated and treated with 133.38 grams of 2-(2-methoxyethoxy)-ethyl-cyanoacetate in the presence of an organic base and a solvent.
The following base/solvent combinations are used:
The desired product (5) is obtained in yields of 38% (82.4 grams) as an dark oil.
After column chromatography over silica gel and toluene/acetone (9:1) as eluent the product (105) crystallizes from water as orange crystals. Melting point: 43.5-45° C.
By using 5 grams of 3-(1-piperidinyl)-2-propenal and 7.39 grams of 2-(2-methoxyethoxy)ethyl-2-cyano acetic acid ester in the presence of a base and optionally a solvent the desired product is obtained in yields of 32% (3.5 grams) as an dark oil.
The following base/solvent combinations are used:
2.89 grams of piperidine are condensed with 1,1,3,3-tetramethoxypropane in acetic acid, concentrated and treated with 1.22 grams of 2-cyano-N-(2-hydroxyethyl)acetamide in the presence of an organic base and a solvent.
The following base/solvent combinations are used:
The reaction end point is confirmed by thin layer chromatography or high performance liquid chromatography.
After the reaction, the product (6) is obtained from the reaction mixture through ordinary product isolation by liquid-liquid separation, column chromatography or crystallization by addition of a poor solvent to the reaction mixture.
The desired product (6) is obtained as a brownish oil which crystallizes in form of yellow crystals (0.24 g, 10%).
Melting point: 139.4-141.0° C.
27.84 grams of piperidine are condensed with 1,1,3,3-tetramethoxypropane in acetic acid, concentrated and treated with 56.77 grams of (2,2-dimethyl-1,3-dioxolan-4-yl)methyl cyanoacetate in the presence of an organic base and a solvent.
The following base/solvent combinations are used:
74.74 grams of the compound (20) are obtained yielding yellow crystals.
70 ml of hydro chloride acid (1 N) are added to a solution of 74.74 grams of merocyanine compound (20) in 350 ml of ethanol. The reaction mixture is stirred for hours at 40° C. After adding water the product is extracted several times with ethyl acetate. The combined organic phases are dried with sodium sulphate, filtrated and concentrated under vacuum yielding the crude product as a brown oil.
After crystallization 34.44 grams of the product is yielded as a yellow powder.
Melting point: 101° C.
236.72 grams of piperidine are condensed with 1,1,3,3-tetramethoxypropane in acetic acid, concentrated and treated with 217.24 grams of 1-(2-hydroxy)pentyl cyanoacetate in the presence of an organic base and a solvent.
The following base/solvent combinations are used:
500 grams of the crude product (109) are obtained yielding a dark brown oil.
After column chromatography (silica gel, eluent: toluene/ethyl acetate) and crystallization 53.09 grams (23%) of the desired product are obtained yielding yellow crystals.
Melting point: 130° C.
1.81 grams of morpholine are treated with 1,1,3,3-tetramethoxypropane in acetic acid, concentrated and treated with 1.89 grams of (2,2-dimethyl-1,3-dioxolan-4-yl)methyl cyanoacetate in the presence of an organic base and a solvent.
The following base/solvent combinations are used:
2.99 grams of the crude product (110) are obtained yielding a dark brown oil.
After column chromatography (silica gel, eluent: toluene/acetone) and crystallization 1.17 grams (50%) of the compound (110) are obtained yielding yellowish crystals.
1 ml of hydro chloride acid (1 N) are added to a solution of 1.17 grams of merocyanine compound (21) in 5 ml of ethanol. The reaction mixture is stirred for 16 hours at room temperature.
The product is filtered off and washed with small amounts of ethanol and water. After drying under vacuum 0.36 grams of the product is yielded as a yellowish powder.
Melting point: 144.5-146.0° C.
83.40 grams of morpholine are condensed with 1,1,3,3-tetramethoxypropane in acetic acid and treated with 47.15 grams of 2-ethoxyethyl cyanoacetate in the presence of the organic base and a solvent.
The following base/solvent combinations are used:
32.58 grams of the compound (10) are obtained yielding yellow crystals.
Melting point: 81.5° C.
The merocyanine compound (12) is synthesized according to a method described on pages 367-371 in Synthetic Communications Vol. 33, No. 3, 2003.
By using 113.00 grams of ethyl-2-hydroxyethylaminoacrolein and 102.47 grams of n-butyl cyanoacetate 123.46 grams of the crude product are obtained yielding a brown oil.
After crystallization 23.29 g of the product is obtained yielding yellowish crystals.
Melting point: 78.0° C.
The merocyanine compound (13) is synthesized according to the synthesis of merocyanine 12 yielding the desired product as a brownish oil. 1H-NMR (CDCl3):
δ=7.73 (1H, d), 7.24 (1H, d), 5.5 (1H, t), 4.07-4.33 (5H, m), 3.44-3.55 (2H, m), 3.16-3.26 (2H, m), 1.67 (2H, m), 1.22-1.45 (12H, m), 0.9 (3H, m).
122.23 grams of 3-[(3-methoxypropyl)amino]-2-cyclohexen-1-one are alkylated with dimethylsulfate or alternatively with diethylsulfate and treated with 75.45 grams of ethyl cyanoacetate in approximately equimolar proportions in the presence of a base and optionally a solvent.
The following base/solvent combinations are used:
Completion of the alkylation reaction can be monitored for example by TLC, GC or HPLC methods.
162.30 grams of the product (115) are obtained yielding a brown oil.
After crystallization the product is obtained yielding yellowish crystals.
Melting point: 92.7° C.
101.00 grams of 3-[(3-methoxypropyl)amino]-2-cyclohexen-1-one are alkylated with dimethylsulfate or alternative with diethylsulfate and treated with 86.00 grams of 2-cyano-N-(3-methoxy-propyl)-acetamide in approximately equimolar proportions in the presence of a base and optionally a solvent.
The following base/solvent combinations are used:
The crude product (15) is obtained yielding a dark brown oil.
After silica gel column chromatography (eluent:
toluene/methanol 99:1) 81.8 grams of the product are obtained yielding yellowish crystals.
Melting point: 84.7-85.3° C.
111.0 grams of 3-[(2-ethylhexyl)amino]-2-cyclohexen-1-one are alkylated with dimethylsulfate or alternatively with diethylsulfate and are then treated with 64.10 grams of 2-cyano-N-(2-hydroxy-ethyl)-acetamide in the presence of a base and optionally a solvent.
The following base/solvent combinations are used:
The reaction temperature is between 60 to 120° C.
The crude product is obtained yielding brownish crystals.
After recrystallization 97 grams of the product were obtained yielding yellowish crystals. Melting point: 117-119° C.
100.56 grams of 3-[(2-hydroxypropyl)amino]-2-cyclohexen-1-one are alkylated with dimethylsulfate or alternatively with diethylsulfate and treated with 84.70 grams of isobutyl cyanoacetate in the presence of a base and optionally a solvent.
The following base/solvent combinations are used:
15.97 grams of the crude product (17) is obtained yielding a dark brown oil.
After silica gel chromatography (eluent: hexane/ethyl acetate) 45.67 grams of the product were obtained yielding yellowish crystals. Melting point: 106.7° C.
13.09 grams of 3-[(3-methoxypropyl)amino]-2-cyclohexen-1-one are alkylated with dimethylsulfate or alternatively with diethylsulfate and treated with 10.12 grams of isobutyl cyanoacetate in the presence of a base and optionally a solvent.
The following base/solvent combinations are:
15.97 grams of the crude product (27) are obtained yielding a dark brown oil.
After silica gel chromatography (eluent: toluene/acetone) 13.46 grams of the product were obtained yielding yellowish crystals. Melting point: 96.3° C.
222.62 grams of dipropylamine are condensed with 1,1,3,3-tetramethoxypropane in acetic acid and treated with 200.13 grams of (2,2-dimethyl-1,3-dioxolan-4-yl)methyl cyanoacetate in the presence of an organic base and a solvent as described on page 4 in US2003/0181483A1.
The following Base/solvent combinations are used:
327 grams of the crude product (22) are obtained yielding a brown oil.
317 ml of hydro chloride acid (1 N) are added to a solution of 327 grams of crude merocyanine (22) in 990 ml of ethanol.
The reaction mixture is stirred for 16 hours at room temperature.
After removal of ethanol in vacuum the reaction mass was taken up in water and the product is extracted several times with ethyl acetate.
The collected organic phases are concentrated in vacuum.
After silica gel column chromatography (eluent: toluene/ethyl acetate) and crystallization 70 grams of the desired product are obtained yielding yellowish crystals.
Melting point: 73° C.
66.43 grams of dibutylamine are condensed with 1,1,3,3-tetramethoxypropane in acetic acid and treated with 46.81 grams of (2,2-dimethyl-1,3-dioxolan-4-yl)methyl cyanoacetate in the presence of an organic base and a solvent.
The following Base/solvent combinations are used:
82.49 grams of the crude product (24) are obtained yielding a black oil.
80 ml of hydro chloride acid (1 N) are added to a solution of 82.5 grams of crude merocyanine (24) in 250 ml of ethanol. The reaction mixture is stirred for 16 hours at room temperature. After removal of ethanol in vacuum the reaction mass is taken up in water and the product is extracted several times with ethyl acetate.
The collected organic phases are concentrated in vacuum.
After silica gel column chromatography (eluent: toluene/acetone) 37.85 grams of the desired product are obtained yielding a brownish oil.
HPLC (210 nm): 99.3 A-%. 1H-NMR (CDCl3): δ=7.8 (1H, d), 7.2 (1H, d), 5.6 (1H, t), 4.27 (2H, m), 3.98 (1H, m), 3.5-3.7 (2H, m), 3.25-3.33 (4H, m), 3.00 (2H, s), 1.61 (4H, m), 1.35 (4H, m), 0.96 (6H, m).
148.4 grams of 3-[(3-methoxypropyl)amino]-2-cyclohexen-1-one are alkylated with dimethylsulfate or alternatively with diethylsulfate and treated with 130.00 grams of 2-ethoxyethyl cyanoacetate in the presence of an organic base and a solvent.
The following base/solvent combinations are used:
The UV shielding properties of the merocyanine derivatives are investigated by measuring their UV spectra in ethanol. In the following table the investigated absorption maxima (Amax) together with the corresponding A1%1cm values are listed.
All merocyanine compounds according to the present invention possess extraordinary high shielding properties in the UV region as indicated by A1%1cm cm values above 1500.
The UV protection efficacy of these compositions has been evaluated.
Aqueous and oil Phases A and B are prepared by mixing the raw materials under stirring at 80° C.; the obtained solutions are macroscopically homogeneous. Emulsions are prepared by slow introduction of the oil phase B1 in the aqueous phase under shearing using a rotor/stator Moritz homogenizer at the rotating speed of 4000 RPM during 15 minutes. The emulsion temperature is then decreased from 80° C. down to 40° C. under stirring. Oil phase B2 is then introduced in the emulsion under low shear. The emulsion is cooled down to room temperature under low shear. The emulsion is characterized by droplets which size is between 1 μm and 10 μm.
In vitro Evaluation protocol of UV protection efficacy The Persistant Pigmentation Darkening (PPD) is determined using the in vitro method described by B. L. Diffey in the paper J. Soc. Cosmet. Chem. 40, 127-133, (1989) for Sun Protection Factor (SPF). Measurements are carried out using a Labsphere UV-1000S spectrophotometer. Formulae are applied on a rough PPMA plate, to get a homogeneous film at the rate of 1 mg/cm2.
The percentage of residual amount of each UV filter (merocyanine compound and dibenzoylmethane compound) caused by the exposure to a solar simulator of a formula spread in a film having a thickness of about 20 μm was measure.
The evaluation was done by HPLC analysis of each UV filter in a solution after extraction of the film, by comparing exposed and non-exposed samples.
Solar simulator: Apparatus Oriel 1000W equipped with a 4 pouces outlet, a 81017 filter and a dichroic mirror. The samples were exposed in horizontal position.
UV-Meter: Apparatus OSRAM CENTRA equipped with two reading heads, one for the UVA radiation and the other one for the UVB radiation.
The simulator and UV meter are together calibred annually by spectroradiometry.
Exposure measurements were done at the beginning and at the end of the exposure by positioning the reading heads at the position of the sample.
The UV exposure was characterized by:
Each residual amount of each UV filter was measured by HPLC chromatography with a sensor having diodes bars.
Each residual amount of each UV filter was measured by HPLC chromatography with a sensor having diodes bars.
About 20 mg of the composition are spread on the surface of a rough melt silica disc.
3 films of composition were exposed to the solar simulator and 3 other films were used as control.
The samples were exposed 3 per 3 to the light of the simulator during a sufficient time delivering an UVA dose of 42 J/cm2.
At the end of the exposure, the disc was introduced in a bowl of 600 ml with 10 ml of appropriate solvent (ie generally ethanol). The disc and the bowl were then placed during 5 minutes in an ultrasonic tank.
The solutions were then transferred in appropriate bottles compatibles with the HPLC chromotograph.
It was observed that, in the composition 9, the photostability of the merocyanine compound of the invention and the photostability of the dibenzoylmethane are both satisfactory.
The chemical stability of the compounds can be assessed in a water/ethanol solution 1/1 with compounds solubilized at 0.5%.
These solutions could be acidified to check also stability toward acid media for example HCl 0.1M in a water/ethanol/isopropanol 50/40/10 (v/v/v).
Once the solution prepared, it is placed in an oven at 45° C. for 2 months for stability and 1 h at 60° C. for acidic stress. Then the solution is aliquoted (0.005% w/v in H2O/ACN 50/50) for liquid chromatography analysis to check disappearance or not.
UPLC Acquity (Waters) with diod array detector eλ (Waters).
Column: Acquity HSS T3 (Waters), length: 50 mm, Inner diameter: 2.1 mm, particles diameter 1.8 μm. Mobile phase A=ammonium acetate 20 mM, B=Acetonitrile.
Analysis: 1 μL injection
Elution time of compound 25: 2.56 min
Elution time of compound 15: 2.11 min
Acid media stability
These results show the superiority of compound 25 versus 15.
| Number | Date | Country | Kind |
|---|---|---|---|
| PCT/EP2011/062522 | Jul 2011 | EP | regional |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2012/064195 | 7/19/2012 | WO | 00 | 4/18/2014 |
