Patent Application
20090036615
This application claims benefit of Japanese Patent application No. 2007-201326 filed on Aug. 1, 2007, the contents of which are hereby incorporated by reference.
The present invention relates to a film-forming composition, specifically to a film-forming composition which is useful for cosmetics and drugs to protect the skin or hair.
As a film-forming agent to protect surfaces of the skin or hair by providing water repellency to the skin or hair, silicone resins have been widely used. However, a film made from the silicone resin tends to be hard to give twitchy feel to the skin, or the film tends to crack and fall off.
A skin conditioning agent has been presented which comprises 100 parts by weight of a silicone fluid having a viscosity of from 20 to 1,000,000 cSt at 25° C. and 1 to 200 parts by weight of a silicone resin. A film made from the agent, however, is sticky and does not have sufficient adhesion strength to the skin due to relatively large amount of the silicone fluid.
A polysiloxane having a high degree of polymerization of from 3,000 to 20,000 has been used as a film-forming agent for the skin or hair. A film made from the polysiloxane is not sticky, but is soft and has low adhesion strength and abrasion-resistance. To compensate these drawbacks, Japanese Patent Application Laid-Open No. S63-313713 and No. S64-43342 present compositions comprising the aforesaid silicone resin together with the polysiloxane. However, films made from the compositions are still sticky and not satisfactorily abrasion resistant.
Japanese Patent Application Laid-Open No. H04-45155 describes a composition comprising a blend of a specific silicone resin and a specific polysiloxane. A film made from the composition has improved adhesion strength, abrasion resistance and non-stickiness, but still remain rooms for improvement to meet recent high requirements of users.
An object of the present invention is to provide a film-forming composition which can form a film which is non-sticky and has an excellent abrasion resistance.
The present inventors have found that the object can be achieved by using a polysiloxane having a specific amount of a C7-30 aliphatic hydrocarbon side chains in combination with the aforesaid silicone resin.
The present invention is a film-forming composition in a solution form, comprising
(A) a Silicone resin comprising SiO2 units and R3SiO1/2 units, wherein R may be the same with or different from each other and is a C1-6 monovalent hydrocarbon group, with a molar ratio of the R3SiO1/2 units to the SiO2 units ranging from 0.5 to 1.5, said silicone resin may comprise R2SiO and RSiO3/2 units, wherein R is as defined above, provided that a total content of the R3SiO1/2 units and the SiO2 units is at least 80 mole % of all of the units,
(B) an organopolysiloxane represented by the following formula (I),
wherein R may be the same with or different from each other and is a C1-6 monovalent hydrocarbon group, R1 may be the same with or different from each other and is a monovalent group selected from the group consisting of C1-6 monovalent hydrocarbon groups, a hydroxyl group, C7-30 monovalent aliphatic hydrocarbon groups, —C3H6NH2 and —C3H6NHC2H4NH2, R2 may be the same with or different from each other and is a C7-30 monovalent aliphatic hydrocarbon group, R3 may be the same with or different from each other and is —C3H6NH2 or —C3H6NHC2H4NH2, a is an averaged number ranging from 450 to 2950, b is an averaged number ranging from 50 to 1500, c is an averaged number ranging from 0 to 50, provided that a+b+c ranges from 500 to 3,000, and
(C) an organic solvent,
wherein a weight ratio of component (A)/component (B) ranges from 65/35 to 85/15, and
a content of the component (C) is such that a total concentration of the components (A) and (B) ranges from 0.1 to 50.0 wt % of total weight of the composition.
The above composition can form a non-sticky and abrasion resistant film or coating on a substrate.
(A) Silicone Resin
In the R3SiO1/2, R2SiO, RSiO3/2 units, R is a monovalent hydrocarbon group having 1 to 6 carbon atoms. Examples of R include methyl, ethyl, propyl, butyl, pentyl, and hexyl and phenyl groups. A plurality of R′ in the silicone resin (A) may be the same with or different from each other. Preferably, 80% or more of R′ are methyl groups.
In the component (A), R3SiO1/2 and SiO2 units are essential units. R2 SiO and RSiO3/2 units may be contained, provided that a total content of R3SiO1/2 and SiO2 units is 80 mole % or higher, preferably 90 mole % or higher of all the units. A silicone resin having a total content of R3SiO1/2 and SiO2 units smaller than 80 mole % tends to be less soluble in an organic solvent.
A molar ratio of R3SiO1/2 units to SiO2 units ranges from 0.5 to 1.5, preferably from 0.7 to 1.2. A silicone resin having a ratio of R3SiO1/2 units to SiO2 units smaller than 0.5 tends to be less soluble in an organic solvent. On the other hand, a silicone resin having the ratio higher than 1.5 tends to form a sticky film.
(B) Organopolysiloxane
The organopolysiloxane (B) is represented by the above formula (I). The organopolysiloxane (B) can be prepared by a known method. For example, the one with c being 0 can be prepared by reacting an organohydrogenpolysiloxane represented by the following formula (II) with an C7-30 aliphatic hydrocarbon having terminal alkenyl groups to derive Si—R2 in the presence of a platinum catalyst,
wherein R may be the same with or different from each other and is a C1-6 monovalent hydrocarbon group, R4 is a hydrogen atom, a hydroxyl group or a C1-6 monovalent hydrocarbon group, a is an averaged number ranging from 450 to 2950, b is an averaged number ranging from 50 to 1500, provided that a+b ranges from 500 to 3,000.
Alternatively, the component (B) can be prepared by reacting a polysiloxane of the following formula (III) with a polysiloxane of the formula (IV) or a polysiloxane of the formula (V) in the presence of a basic catalyst such as phosphorous siliconate or potassium siliconate to cause rearrangement of siloxane units.
In the above formulas, R is as defined above, R2 is a C7-30 monovalent aliphatic hydrocarbon group, and R3 is —C3H6NH2 or —C3H6NHC2H4NH2, R5 is a hydroxyl group, C1-6 monovalent hydrocarbon group, C7-30 aliphatic hydrocarbon group, —C3H6NH2 or —C3H6NHC2H4NH, d is an integer of from 0 to 8, e is an integer of from 1 to 8, f is an integer of from 0 to 8, with d+e+f ranging from 3 to 8, g is an averaged number of from 0 to 3,000 and h is an averaged number of from 1 to 3,000, i is an averaged number of from 1 to 200, with h+i ranging from 1 to 3000.
In the formula (I), R is a monovalent hydrocarbon group having 1 to 6 carbon atoms. Examples of R include methyl, ethyl, propyl, butyl, pentyl, and hexyl and phenyl groups. In the formula (I), a, i.e., the averaged degree of polymerization of R2SiO units ranges from 450 to 2950, preferably from 600 to 2600. An organopolysiloxane with the degree of polymerization smaller than 450 tends to form a coating too soft to be abrasion resistant. On the other hand an organopolysiloxane with the degree of polymerization larger than 2950 is not miscible with the component (A) and tends to form a film which is sticky and may not be resistant to abrasion.
In the formula (I), R2 is a aliphatic hydrocarbon group having 7 to 30 carbon atoms. Examples of R2 include alkyl groups such as heptyl, octyl, nonyl, decyl, dodecyl, tetradecyl, hexadecyl, octadecyl, and icosyl groups; and cycloalkyl group such as methylcyclohexyl group. Particularly preferred are aliphatic hydrocarbon groups having 8 to 22 carbon atoms. In the formula (I), b ranges from 50 to 1,500, preferably from 100 to 800. If b is smaller than 50, a coating may not be resistant to abrasion. An organopolysiloxane having b larger than 1,500 tends to be immiscible with the component (A), so that a film may not be uniform, non-sticky or abrasion-resistant.
In the formula (I), R3 is —C3H6NH2 or —C3H6NHC2H4NH2. By the amino groups, adhesion strength of a coating can be increased. However, too many amino groups may make a coating sticky. In the formula (I), c therefore ranges from 0 to 50.
In the formula (I), the sum of a, b and c on average ranges from 500 to 3,000, preferably from 800 to 2,500. If the sum is smaller than the aforesaid lower limit, a coating may not be hard enough to be abrasion resistant. An organopolysiloxane having the sum larger than the aforesaid upper limit tends to be immiscible with the component (A), so that a film may not be uniform, non-sticky or abrasion-resistant.
A blending ratio of the component (A) to the component (B) ranges from 65/35 to 85/15, preferably from 70/30 to 80/20. If the ratio exceeds the aforesaid upper limit, a film may not be satisfactorily abrasion resistant. If the ratio is below the aforesaid lower limit, a coating tends to be sticky.
(C) Organic Solvent
The component (C) is used as a solvent for the components (A) and (B). Examples of the organic solvent include volatile siloxane, saturated aliphatic hydrocarbon, saturated cyclic hydrocarbons, aromatic hydrocarbons, chlorohydrocarbons, chlorofluorohydrocarbons, and alcohols. Particularly preferred are volatile organosiloxanes and light liquid isoparaffins having a boiling point at atmospheric pressure of from 100 to 250° C.
Examples of the volatile organosiloxane include cyclic siloxanes such as hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, trimethyltriethylcyclotrisiloxane, hexaethyltricyclosiloxane, diethyltetramethylcyclotrisiloxane, dimethyltetraethylcyclotrisilox ane, diethylhexamethylcyclotetrasiloxane, tetraethyltetramethylcyclo tetrasiloxane; linear siloxanes such as hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane, hexaethyldisiloxane, octaethyltrisiloxane; branched siloxanes such as methyltris(trimethylsiloxy)silane, phenyltris(trimethylsiloxy)silane.
Examples of light liquid isoparaffin include isoparaffins having 8 to 16 carbon atoms, and those commercial available under the trade names of Isopars C, E, G, H, L, and M supplied by Exxon Mobile Co., IP Solvents 1016, 1620, and 2028 supplied by Idemitsu Petrochemical Co., Ltd., Markasol R supplied by Maruzen Petrochemical Co., Nisseki Isosols 300 and 400 supplied by Nippon Petrochemical Co., and Shellsol 71 supplied by Shell Chemical Co. Among these isoparaffins are preferred, and isododecane is particularly preferred.
The component (C) is incorporated in the composition in such an amount that a total content of the components (A) and (B) ranges from 0.1 to 50 wt %, preferably from 1 to 30 wt %, of total weight of the composition. If the total content is lower than the aforesaid lower limit, a uniform coating may not be obtained. If the total content exceeds the aforesaid upper limit, a film may be too thick for the component (C) to fully evaporate, making the film sticky.
In addition to the aforesaid components (A) to (C), the present composition can contain commonly used additives such as antioxidants in an amount not to adversely affect the composition.
The present composition can be prepared by dissolving the components (A) and (B), and optional components, if desired, in the component (C) at room temperature.
The present invention will be explained with reference to the following Examples, but not limited thereto.
Film-forming compositions were prepared by dissolving components (A) and (B) according to the recipes as shown in Tables 1 and 2 in isododecane sold under the trade name “Markasol R” from Maruzen Petrochemical Co. From each of the compositions, two films were prepared by the following methods.
Heat and Dry Method
Ten grams of the composition was placed in an aluminum plate having an internal diameter of 60 mm and a depth of 10 mm, which was then placed in a hot-air circulation type oven at 150° C. After 3 hours, the plate was taken out from the oven and cooled to room temperature.
Apply on the Skin Method
On the face skin, 0.1 g of the composition was applied uniformly and left stood for 1 hour.
Evaluation
The films were evaluated according to the methods described below. The results are as shown in Table 2, wherein “Ex.” stands for Example, “Comp.Ex.” for Comparative Example, “Conc.” for concentration, “Trans.” for transparency, “Non-Stick.” for non-stickiness, and “Ab.Res.” for abrasion resistance.
(1) Transparency
Transparency of the films were evaluated by visual observation and rated according to the following criteria.
(2) Non-Stickiness
A surface of the films were touched by a finger and evaluated for non-stickiness and slickness, and rated according to the following criteria.
(3) Abrasion Resistance
A surface of the films were scrubbed by a finger nail and rated according to the following criteria.
Materials Used
(A) Silicone Resin
Silicone resin I consisting of (CH3)3SiO1/2 units and SiO2 units with (CH3)3 SiO1/2:SiO2=0.85:1;
Silicone resin II consisting of (CH3)3SiO1/2 units and SiO2 units with (CH3)3SiO1/2:SiO2=0.70:1
(B) Organopolysiloxane
Organopolysiloxanes represented by the following formula (VI) with the R2, R3, and the averaged numbers as shown in Table 1 were used.
The composition of the present invention can form a non-sticky and abrasion resistant film and therefore useful for cosmetics or drugs to protect surface of the skin or hair.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2007-201326 | Aug 2007 | JP | national |
