Patent Grant
8791058
This application is the U.S. National Phase of International Application No. PCT/FR2009/063670 filed on Oct. 19, 2009, which claims priority to French Application No. FR 08/05854 filed Oct. 22, 2008, both of which are incorporated by reference herein in their entireties.
The present invention relates to compositions for household care comprising a cationic nanogel, especially for treating and/or modifying hard or textile surfaces. The composition especially allows hydrophilization of hard surfaces, which is useful especially in cleaning or rinsing operations.
Household care compositions comprise various ingredients which, individually or in combination, give said compositions the usual properties for the use for which they are intended, or modify certain properties. Cleaning compositions, for example, often comprise surfactants. Certain compositions comprise polymers, for example in order to give them particular rheological properties (for example to thicken them) or in order to modify surface properties, especially by deposition.
There is a constant need for novel ingredients, especially for polymers, and for novel combinations, in order to design household care compositions that have new properties, improved properties, or more simply to conserve the same properties with simpler and/or more economical compositions.
The patent application filed at the European Patent Office on Sep. 20, 2007 under the number 07291118.3 describes, for example, the use of certain cationic linear statistical copolymers for improving foam stability especially in laundry-care foaming compositions. However, the compositions comprising this copolymer cannot prevent the redeposition of soiling on the laundry. There is a need for polymers for improving the foam stability and for improving the prevention of redeposition.
Document WO 2007/071591 describes the use of nanogels for treating hard surfaces. Said document especially teaches, in examples 3.1 and 3.2, that star copolymers containing cationic peripheral branches can facilitate the cleaning of bathroom surfaces. However, these copolymers require sequential multistep polymerization processes, which make them expensive. Relative to star copolymers, there is a need for compounds that are simpler to prepare and/or for compounds that have applicative advantages at least of the same order of magnitude, if not higher, and/or that moreover have other advantages. There is also a need for polymers that afford a longer-lasting treatment, for example that afford ease of cleaning even after more time and/or being subjected to treatments with water, for example during rinsing, splashing or cleaning in the absence of polymer. The document also teaches, in example 6.1, that nanogels composed of a neutral core C without peripheral branches afford good hydrophilization. There too there is also a need for polymers that afford a longer-lasting treatment, for example that afford ease of cleaning even after more time and/or being subjected to treatments with water, for example during rinsing, splashing or cleaning in the absence of polymer.
Moreover, nanogels or microgels and processes for preparing them have been described in the literature.
Document. WO 2004/048 429 describes a process for preparing microgels based on monofunctional and multifunctional monomers in which the reactivity of these two types of monomer is appropriately chosen so as to produce discrete particles with an average molecular mass of at least 105. In the examples, noncationic nanogels based especially on methyl (meth)acrylate are prepared.
Document WO 2004/048 428 describes microgels that are characterized by certain rheological properties. In the examples, noncationic nanogels based especially on methyl (meth)acrylate are prepared.
Document WO 0056792 describes gels prepared from triethylenically unsaturated monomers. In the examples, noncationic nanogels based especially on acrylamide are prepared.
Document WO 98/31739 describes the preparation of nanogels by controlled radical polymerization using nitroxides. In the examples, noncationic nanogels based especially on styrene monomers are prepared.
There is a need for other polymers, that may find use in compositions for household care.
The present invention satisfies at least one of the needs mentioned above, by proposing a composition for household care comprising a cationic nanogel, formed from chemically crosslinked macromolecules with a core C comprising:
the nanogel being different than a star copolymer comprising macromolecular branches at the periphery of the core,
the average size of the macromolecules preferably being from 5 to 500 nm and preferably from 30 to 170 nm.
The invention also relates to the use of the cationic nanogel in household care compositions. The cationic nanogel may especially be used as foam stabilizer, preferably on addition of soiling, and/or as anti-redeposition agent or as hydrophilization agent and/or as antisoiling agent. The invention also relates to the use of the compositions in the context of household care, for example in the context of treatment, preferably cleaning, of hard surfaces or textile surfaces.
The nanogels used for the invention are macromolecules. They are occasionally referred to as “polymer(s)” or “copolymer(s)” in the present patent application.
In the present patent application, the mean size of the macromolecules is defined as the mean hydrodynamic diameter measured by light scattering (dynamic light scattering).
In the present patent application, the term nanogel means a macromolecular copolymer compound with a core. A core is a chemically crosslinked macromolecule comprising units derived from a monomer comprising only one polymerizable function and units comprising at least two polymerizable functions. The nanogel of the invention is different than a nanogel comprising at the periphery of the core macromolecular branches, connected to the core. The term “core” is used as opposed to macromolecular branches at the periphery. Nanogels with a core and no peripheral branches are macromolecular architectures known to those skilled in the art. The term “star copolymer” is occasionally used to denote nanogels comprising macromolecular branches at the periphery of the core.
In the present patent application, the term “core C” means a nanogel comprising a chemically crosslinked polymeric core, but not comprising any macromolecular branches at the periphery of the core. They are microscopic macromolecules with intra-chain crosslinks. Such cores C may be obtained by copolymerization of a monomer C bearing only one polymerizable group and of a crosslinking monomer R bearing at least two polymerizable groups (crosslinking monomer), in the absence of surfactant, or in the presence of a small amount of surfactant (for example less than 10% by weight, preferably less than 5% by weight, or even less than 1% by weight or none at all). They are especially distinguished in this from “nanolatices”, which are polymers obtained by emulsion polymerization in the presence of large amounts of surfactants at thermodynamic equilibrium or close thereto.
In the present patent application, the term unit derived from a monomer denotes a unit that may be obtained directly from said monomer by polymerization. Thus, for example, a unit derived from an acrylic or methacrylic acid ester does not cover a unit of formula —CH2—CH(COOH)—, —CH2—C(CH3)(COOH)— or —CH2—CH(OH)—, respectively, obtained, for example, by polymerizing an acrylic or methacrylic acid ester, or vinyl acetate, respectively, followed by hydrolyzing. A unit derived from acrylic or methacrylic acid covers, for example, a unit obtained by polymerizing a monomer (for example an acrylic or methacrylic acid ester) and then by reacting (for example by hydrolysis) the polymer obtained so as to obtain units of formula —CH2—CH(COOH)—, or —CH2—C(CH3)(COOH)—. A unit derived from a vinyl alcohol covers, for example, a unit obtained by polymerizing a monomer (for example a vinyl ester) and then by reacting (for example by hydrolysis) the polymer obtained so as to obtain units of formula —CH2—CH(OH)—.
The following symbols are defined:
In the present patent application, the term “hydrophobic”, for a monomer, is used in its usual sense as “which has no affinity for water”; this means that the monomer can form a two-phase macroscopic solution in distilled water at 25° C., at a concentration of greater than or equal to 1% by weight, or that it has been categorized as hydrophobic in the present patent application.
In the present patent application, the term “hydrophilic”, for a monomer, is also used in its usual sense as “which has affinity for water”, i.e. which is incapable of forming a two-phase macroscopic solution in distilled water at 25° C. at a concentration of greater than or equal to 1% by weight, or that it has been characterized as hydrophilic in the present patent application.
The term cationic or potentially cationic units means units that comprise a cationic or potentially cationic group. The cationic units or groups are units or groups that bear at least one positive charge (generally associated with one or more anions such as the chloride ion, the bromide ion, a sulfate group or a methyl sulfate group), irrespective of the pH of the medium into which the nanogel is introduced. The potentially cationic units or groups are units or groups that may be neutral or bear at least one positive charge depending on the pH of the medium into which the nanogel is introduced. In this case, they will be referred to as potentially cationic units in neutral form or in cationic form. By extension, reference may be made to cationic or potentially cationic monomers.
The term anionic or potentially anionic units means units that comprise an anionic or potentially anionic group. The anionic units or groups are units or groups that bear at least one negative charge (generally associated with one or more cations such as cations of alkali metal or alkaline-earth metal compounds, for example sodium, or with one or more cationic compounds such as ammonium), irrespective of the pH of the medium in which the nanogel is present. The potentially anionic units or groups are units or groups that may be neutral or bear at least one negative charge, depending on the pH of the medium in which the nanogel is present. In this case, they will be referred to as potentially anionic units in neutral form or in anionic form. By extension, reference may be made to anionic or potentially anionic monomers.
The term neutral units means units that do not bear a charge, irrespective of the pH of the medium in which the nanogel is present.
The term “remanent antideposition and/or antiadhesion properties” means that the treated surface conserves these properties over time, including after subsequent contact with soiling (for example rainwater, water from the rinsing-water distribution network optionally containing rinsing products, splashes, fats, soaps, etc.). This remanence property may be observed beyond three rinsing cycles, or even, in certain particular cases where the rinses are numerous (for example in the case of toilets), beyond 6, 10 or 100 rinsing cycles.
The above expression “giving the surface antideposition properties” more particularly means that the treated surface, placed in contact with soiling in a predominantly aqueous medium, will not have a tendency to “take up” said soiling, which thus significantly reduces the deposition of soiling on the surface.
The above expression “giving the surface antiadhesion properties” more particularly means that the treated surface is only sparingly liable to interact with the soiling that is deposited thereon, which allows easy removal of the soiling from the soiled treated surface; specifically, during the drying of the soiling placed in contact with the treated surface, the bonds developed between the soiling and the surface are very weak; thus, breaking these bonds requires less energy (and thus less effort) during the cleaning operation.
When it is stated that the presence of the nanogel makes it possible “to improve the cleaning capacity” of a formulation, this means that, for the same amount of cleaning formulation (especially a washing-up formulation), the formulation containing the nanogel allows a larger number of soiled objects to be cleaned than a formulation that is free of nanogel.
In addition, the deposition on a hard surface of the nanogel affords this surface antistatic properties; this property is particularly advantageous in the case of synthetic surfaces.
The presence of the nanogel in formulations for treating a hard surface makes it possible to make the surface hydrophilic or to improve its hydrophilicity.
The hydrophilization property of the surface furthermore makes it possible to reduce the formation of fogging on the surface; this benefit may be exploited in cleaning formulations for glasses and mirrors, in particular in bathrooms. Furthermore, the rate of drying of the surface, immediately after its treatment by applying the polymer but also after subsequent and repeated contact with an aqueous medium, is very significantly improved.
The term “hard surfaces” should be taken in the broad sense; these are nontextile surfaces, which may be household, public or industrial surfaces.
They may be made of any material, especially such as:
The “hard surfaces” according to the invention are sparingly porous and nonfibrillar surfaces; they should thus be distinguished from textile surfaces (fabrics, carpets, clothing, etc. made of natural, artificial or synthetic materials).
Nanogel
The nanogel of the invention (core C) comprises:
crosslinking units R derived from a crosslinking monomer R comprising at least two polymerizable groups, and
core units C derived from at least one monomer C comprising only one polymerizable group, comprising
The polymerizable groups of the monomers C and R are preferably ethylenically unsaturated and preferably α-ethylenically unsaturated groups. The monomers C are thus preferably monoethylenically unsaturated monomers, preferably mono-α-ethylenically unsaturated monomers. The monomers R are thus preferably polyethylenically unsaturated monomers, preferably di- or triethylenically unsaturated, for example di-α-ethylenically unsaturated or tri-α-ethylenically unsaturated monomers.
It is not excluded for the units C and the monomers C to comprise several different units or to be derived from several different monomers. It is not excluded for the units Ccat and the monomers Ccat to comprise several different units or to be derived from several different monomers. It is noted that the units C or the monomers C may comprise both units Ccat and units CN or may be derived both from monomers Ccat and CN. The units C and the monomers C may also optionally comprise other types of units, or may optionally be derived from other monomers. The units C may especially also comprise zwitterionic units CZ, derived from zwitterionic monomers CZ, and/or anionic or potentially anionic units CA derived from anionic or potentially anionic monomers CA.
The nanogel may be obtained via a process using a controlled radical polymerization process, as outlined hereinbelow.
The nanogel is different than a star copolymer comprising a core C and macromolecular branches at the periphery of the core. The nanogel may have a control group or a residue of such a group at ends of the polymer molecules.
The nanogel may especially be in the form of powder, in the form of a dispersion in a liquid or in the form of a solution in a solvent. The last two forms may be likened to forms in dispersed media. The nanogel may be included, for example, in an aqueous medium (comprising water), for example in aqueous medium or the like. The form generally depends on the requirements associated with the use of the nanogel. It may also be associated with the process for preparing the nanogel.
The nanogel may especially be formed from crosslinked macromolecules with a mean size ranging from 5 to 500 nm and preferably from 30 to 170 nm. The sizes may be conventionally determined by light scattering techniques or X-ray diffraction techniques, in dispersed media.
The nanogel, and the process for preparing it, is preferably such that it does not form a crosslinked macroscopic macromolecular network (interchain crosslinking). If it is in dispersed medium, for example in aqueous medium, the nanogel advantageously has a viscosity (Brookfield) of less than 20 000 cP and preferably less than 10 000 cP, at 25° C., at a shear rate of 100 s−1 or less, or preferably at a shear rate of 10 s−1.
It has especially been noted that nanogels bearing cationic or potentially cationic units Ccat may have particularly small sizes, and that processes using monomers Ccat may make it possible to substantially reduce the size of the nanogels. The invention may make it possible to reduce the sizes in a simple manner.
The nanogel (core C) comprises polymerized units. All the units mentioned below may be envisioned, as may combinations thereof. Certain combinations are the subject of particular embodiments.
As examples of potentially cationic monomers Ccat from which the potentially cationic units Ccat may be derived, mention may be made of:
As examples of cationic monomers Ccat from which the cationic units Ccat may be derived, mention may be made of:
ammoniumacryloyl or acryloyloxy monomers such as
By way of example of hydrophilic neutral monomers CNphilic from which the hydrophilic neutral units CNphilic may be derived, mention may be made of:
As examples of hydrophobic neutral monomers CNphobic from which the hydrophobic neutral units CNphobic may be derived, mention may be made of:
As examples of anionic or potentially anionic monomers CA from which anionic or potentially anionic units CA may be derived, mention may be made of:
As examples of zwitterionic monomers CZ from which the zwitterionic units CZ may be derived, mention may be made of:
monomers bearing a carboxybetaine group,
monomers bearing a sulfobetaine group, for example sulfopropyldimethylammoniumethyl methacrylate (SPE), sulfoethyldimethylammoniumethyl methacrylate, sulfo-butyldimethylammoniumethyl methacrylate, sulfohydroxy-propyldimethylammoniumethyl methacrylate (SHPE), sulfo-propyldimethylammoniumpropylacrylamide, sulfopropyl-dimethylammoniumpropylmethacrylamide (SPP), sulfo-hydroxypropyldimethylammoniumpropylmethacrylamide (SHPP), sulfopropyldiethylammoniumethyl methacrylate or sulfohydroxypropyldiethylammoniumethyl methacrylate,
monomers bearing a phosphobetaine group, such as phostatoethyltrimethylammoniumethyl methacrylate,
mixtures or combinations thereof.
The crosslinking monomers R from which the crosslinking units R may be derived may be chosen especially froth organic compounds comprising at least two ethylenic unsaturations and not more than 10 unsaturations and that are known as being reactive via a radical route. Preferably, these monomers bear two or three ethylenic unsaturations.
Thus, mention may be made especially of acrylic, methacrylic, acrylamido, methacrylamido, vinyl ester, vinyl ether, diene, styrene, α-methylstyrene and allyl derivatives. These monomers may also contain functional groups other than ethylenic unsaturations, for example hydroxyl, carboxyl, ester, amide, amino or substituted amino, mercapto, silane, epoxy or halo functions.
The monomers belonging to these families are divinylbenzene and divinylbenzene derivatives, vinyl methacrylate, methacrylic acid anhydride, allyl methacrylate, ethylene glycol dimethacrylate, phenylene dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, polyethylene glycol 200 dimethacrylate, polyethylene glycol 400 dimethacrylate, 1,3-butanediol dimethacrylate, 1,4-butanediol dimethacrylate, 1,6-hexanediol dimethacrylate, 1,12-dodecanediol dimethacrylate, 1,3-glycerol dimethacrylate, diurethane dimethacrylate and trimethylolpropane trimethacrylate. For the multifunctional acrylate family, mention may be made especially of vinyl acrylate, bisphenol A epoxy diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, polyethylene glycol 600 diacrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, ethoxylated neopentyl glycol diacrylate, butanediol diacrylate, hexanediol diacrylate, aliphatic urethane diacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, propoxylated glycerol triacrylate, aliphatic urethane triacrylate, trimethylolpropane tetraacrylate, dipentaerythritol pentaacrylate. As regards the vinyl ethers, mention may be made especially of vinyl crotonate, diethylene glycol divinyl ether, 1,4-butanediol divinyl ether, triethylene glycol divinyl ether. For the allylic derivatives, mention may be made especially of diallyl phthalate, diallyldimethylammonium chloride, diallyl maleate, sodium diallyloxyacetate, diallylphenylphospine, diallyl pyrocarbonate, diallyl succinate, N,N′-diallyltartardiamide, N,N-diallyl-2,2,2-trifluoroacetamide, the allylic ester of diallyloxyacetic acid, 1,3-diallylurea, triallylamine, triallyl trimesate, triallyl cyanurate, triallyl trimellitate, triallyl-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione. For the acrylamido derivatives, mention may be made especially of N,N′-methylenebisacrylamide, N,N′-methylenebismethacrylamide, glyoxal bisacrylamide, diacrylamido acetic acid. As regards the styrene derivatives, mention may be made especially of divinylbenzene and 1,3-diisopropenylbenzene. In the case of diene monomers, mention may be made especially of butadiene, chloroprene and isoprene.
As polyethylenically unsaturated monomers, N,N′-methylenebisacrylamide (MBA), divinylbenzene (DVB), ethylene glycol diacrylate, triallyl cyanurate (TAC) or trimethylolpropane triacrylate are preferred.
These polyethylenically unsaturated monomers may be used alone or as mixtures.
If the nanogel comprises units CN, they may advantageously be units CNphilic derived from a hydrophilic neutral monomer CNphilic. The mole ratio between the units Ccat and the units CN, preferably CNphilic, may especially be between 1/99 and 99/1, preferably between 1/99 and 50/50, preferably between 1/99 and 40/60, preferably between 1/99 and 25/75, for example between 2/99 and 10/90.
Nanogels whose composition of units C is as follows may especially be prepared:
Processes that Are Useful for Preparing the Nanogel
All the processes for preparing nanogels as described above may be used.
Processes that are particularly advantageous use a controlled (or “living”) polymerization, with the aid of a control agent or group (occasionally referred to as a transfer group), for example via a controlled (or “living”) radical polymerization process. Such processes are known to those skilled in the art. It is mentioned that it is not excluded to use other methods, especially ring-opening polymerizations (especially anionic or cationic) or anionic or cationic polymerizations.
As examples of living or controlled radical polymerization processes, reference may be made especially to the following processes:
The controlled or living radical polymerizations using control agents or groups (or transfer agents or groups) containing a group —S—CS— (xanthates, dithioesters, trithiocarbonates, dithiocarbamates, dithiocarbazates, etc.) are particularly advantageous.
One practical process for preparing the nanogel is a preparation process comprising the following step a):
polymerization step a), preferably controlled radical polymerization, of a mixture of monomers comprising:
at least one polyethylenically unsaturated crosslinking monomer R, and
at least one monoethylenically unsaturated monomer C, comprising:
The mole ratio between the monomer(s) C and the monomer(s) R is preferably greater than or equal to 50/50 (=1), preferably greater than 60/40, for example from 60/40 to 99.99/0.01, for example from 60/40 to 99.9/0.1, preferably from 60/40 to 99/1, preferably from 80/20 to 99/1 and preferably between 90/10 and 95/5. The ratio between the units C and the units R may be identical.
According to one embodiment, the nanogel is obtained via a process using a controlled radical polymerization process using control groups. In this case, the mole ratio between the number of control groups (i.e. the molar amount of control agent multiplied by the number of control groups borne by an agent) and half of the number of polymerizable groups of the crosslinking monomer R (i.e. half the molar amount of monomer multiplied by the number of unsaturated groups in the monomer) is between 0.05 and 0.5, for example between 0.05 and less than 0.1 or between 0.1 and less than 0.2, or between 0.2 and less than 0.3, or between 0.3 and less than 0.4, or between 0.4 and 0.5.
The nanogel may especially have a molar mass (typically a weight-average molar mass, typically determined by MALS-coupled gas chromatography GC or by MALS-coupled steric exclusion chromatography) of greater than or equal to 100 000 g/mol, preferably greater than or equal to 350 000 g/mol, for example between 500 000 and 3 500 000 g/mol, for example between 1 000 000 and 2 000 000 g/mol.
The polymerization of step a) may especially be performed by placing the following in contact:
Such types of polymerization are known to those skilled in the art and have been the subject of many publications. Reference is made especially to the list established above.
It is mentioned that step a) may be followed by an optional step b) of chemical modification of the macromolecular chains and/or of deactivation of transfer groups borne by macromolecular chains, of destruction or purification of by-products of the chemical modification and/or deactivation.
Steps of chemical modification of the macromolecular chains are directed toward adding to the chains of functional groups, deleting groups from the macromolecular chains or substituting groups of macromolecular chains. These groups may especially be borne by units derived from monomers or borne at the ends of macromolecular chains. Such processes are known to those skilled in the art. Mention is made, for example, of total or partial hydrolysis steps, or total or partial crosslinking steps.
It is possible to perform the deactivation of transfer groups borne by the macromolecular chains, and/or purification and/or destruction of chemical modification and/or deactivation by-products. This may be a reaction for the purification or destruction of certain species, for example via processes such as hydrolysis, oxidation, reduction, pyrolysis, ozonolysis or substitution. An oxidation step with aqueous hydrogen peroxide solution is particularly suitable for treating sulfur species. It is mentioned that some of these reactions or operations may take place totally or partly during a chemical modification step.
The polymerization step a) will generally be performed in the presence of a control agent (or transfer agent) bearing a control group (or transfer group). The control group is preferably a group of formula —S—CS—. It is preferably a nonpolymeric transfer agent comprising a control group of formula —S—CS—. Control groups of formula —S—CS— and compounds comprising these groups, especially control agents, are known to those skilled in the art and are described in the literature. Reference is especially made to the list established above. They may especially be selected according to their reactivity toward certain monomers, and/or according to their solubility in the reaction medium.
The control group may especially comprise a group of formula —S—CS—Z— in which Z is an oxygen atom, a carbon atom, a sulfur atom, a phosphorus atom or a silicon atom, these atoms being, where appropriate, substituted so as to have a suitable valency.
An agent of xanthate type, containing a control group of formula —S—CS—O—, may especially be used.
As control agents that are particularly useful, mention is made of:
—O-ethyl-S-(1-methoxycarbonylethyl) xanthate of formula
(CH3CH(CO2CH3))S(C═S)OEt
dibenzyl trithiocarbonate of formula φ-CH2—S—CS—S—CH2-φ
phenylbenzyl dithiocarbonate of formula φ-S—CS—CH2-φ
N,N-diethyl S-benzyldithiocarbamate of formula (CH3—CH2)2N—CS—S—CH2-φ.
The polymerization step a) will generally be performed in the presence of a source of free radicals. However, for certain monomers, such as styrene, free radicals that can initiate the polymerization may be generated by a monoethylenically unsaturated monomer, at sufficiently high temperatures generally above 100° C. In this case, it is not necessary to add an additional source of free radicals.
The useful source of free radicals is generally a radical polymerization initiator. The radical polymerization initiator may be chosen from the initiators conventionally used in radical polymerization. Such an initiator may be, for example, one of the following initiators:
The amount of initiator to be used is preferably determined such that the amount of radicals generated is not more than 50 mol % and preferably not more than 20 mol % relative to the amount of control or transfer agent.
It is mentioned that the polymerization may be performed by heating, in a known manner, so as to initiate and/or maintain the polymerization process. It is possible, for example, to work at temperatures from 50° C. to 100° C. The degree of polymerization and the masses may be controlled by controlling the polymerization time. The polymerization may especially be stopped by lowering the temperature.
The polymerizations may be performed in any appropriate physical form, for example by solution polymerization in an aqueous medium (comprising water), for example in water or in an aqueous-alcoholic medium (for example water-ethanol) or in a solvent, for example an alcohol (for example ethanol) or THF, or by emulsion polymerization, preferably in inverse emulsion, where appropriate by controlling the temperature and/or the pH so as to make the species liquid and/or soluble or insoluble. The polymerization is preferably formed in solution, as opposed to polymerizations in a dispersed phase (emulsion, microemulsion, polymerization with precipitation of the formed polymer). It is preferred to conserve the nanogel in solution after such a polymerization.
It is pointed out that the nanogels are preferably obtained directly after the polymerization and the optional deactivation, removal or destruction of transfer groups, without a functionalization step after the polymerization.
The respective and relative amounts of monomer(s) C, of crosslinking monomer(s) R and of control agent may be varied so as to control the size of the macromolecules generated, and/or so as to control the nonformation of a macroscopic macromolecular network. A few indications are given below:
for constant amounts of monomer(s) C and of control agent, when the amount of monomer(s) R is increased, the molar masses and the polydispersity index are increased, and macroscopic macromolecular networks may be formed.
for constant amounts of monomer(s) C and of monomer(s) R, when the amount of control agent is decreased, the molecular masses and the polydispersity index are increased, and macroscopic macromolecular networks may be formed,
at constant amounts of control agent and of monomer(s) R, if units CN are present, when the Ccat/CN mole ratio is decreased, macroscopic macromolecular networks may be formed.
Preferably, the polymerization is performed in the presence of a control agent in an amount such that (Ncontrol*ncontrol/nT) is from 0.05% to 10%, preferably from 0.1% to 10% and preferably from 0.2% to 5%.
Preferably, the polymerization is performed in the presence of crosslinking monomers R in an amount such that (NR/2)*(nR/nT) is from 0.01 mol % to 40 mol %, preferably from 0.1 mol % to 40 mol % and preferably from 1 mol % to 40 mol %, for example from 5 mol % to 20 mol %.
The polymerization is preferably, especially in one or both of the ranges mentioned above, performed in the presence of a control agent and of crosslinking monomer(s) R in amounts such that r≧0.05, preferably r≧0.1, preferably r≧0.2, preferably r≧0.25 and preferably r≧0.3. The higher the value of r, the more remote a potential zone for formation of undesired macroscopic macromolecular networks. It is not excluded for the number r to be greater than or equal to 0.5 or 1.
Composition
The household care composition may especially be for treating, preferably cleaning, hard surfaces or textile surfaces. The household cleaning operations include maintenance performed within the private residential sector, and within the public institutional or industrial sector, for example in offices, hotels, restaurants or schools, where appropriate by service companies. The treatments of textile surfaces include washing operations, on finished textile articles.
According to one embodiment, the composition is a laundry washing composition, in a machine or by hand, advantageously by hand or in a semiautomatic machine, the nanogel being used as:
foam stabilizer, preferably on addition of soiling, and/or
an antiredeposition agent.
According to another embodiment, the composition is a composition for cleaning hard surfaces, the nanogel being used as hydrophilization agent and/or as antisoiling agent.
The invention also relates to a method for performing household care, comprising a step of placing a household surface, preferably a textile surface or a hard household surface, in contact with the composition, where appropriate after a preliminary dilution.
The composition is preferably a liquid composition, comprising a liquid application vector, for example water, an alcohol or a mixture. It usually comprises a surfactant.
The composition according to the invention may especially afford the hard surfaces to be treated hydrophilicity, antideposition and/or antiadhesion properties toward soiling. It may be, for example:
a cleaning or rinsing composition for household use; it may be multi-purpose or may be more specific, such as a cleaning or rinsing composition
A cleaning or rinsing composition for industrial or public-sector use; it may be multi-purpose or more specific, such as a composition for cleaning
The composition according to the invention may be in any form and may be used in many ways.
Thus, it may be in the form:
For correct working of the invention, the nanogel is present in the composition forming the subject of the invention in an amount that is effective for modifying and/or treating the surface. It may be, for example, in an amount that is effective for giving said surfaces hydrophilicity and/or antideposition and/or antiadhesion properties toward soiling liable to be deposited on said surfaces.
Said composition forming the subject of the invention may contain, depending on its application, from 0.001% to 10% of its weight of the nanogel.
The pH of the composition or the working pH of the composition according to the invention may range, depending on the applications and the surfaces to be treated, from 1 to 14, or even from 0.5 to 14. The extreme pH values are standard in applications of industrial or public-sector cleaning type. In the field of household applications, the pH values will rather be from 1 to 13, depending on the applications.
Said composition may be used for cleaning or rinsing hard surfaces, in an amount such that, after optional rinsing and drying, the amount of polybetaine (B) deposited on the surface is from 0.0001 to 10 mg/m2 and preferably from 0.001 to 5 mg/m2 of treated surface.
The composition, preferably a cleaning or rinsing composition according to the invention, may also comprise at least one surfactant. This may be nonionic, anionic, amphoteric, zwitterionic or cationic. It may also be a mixture or combination of one or more surfactants.
Among the anionic surfactants, examples that may be mentioned include:
A description of nonionic surfactants is given in U.S. Pat. No. 4,287,080 and U.S. Pat. No. 4,470,923. Mention may be made in particular of condensates of alkylene oxide, especially of ethylene oxide and optionally of propylene oxide, with alcohols, polyols, alkylphenols, fatty acid esters, fatty acid amides and fatty amines; amine oxides, sugar derivatives such as alkyl-polyglycosides or fatty acid esters and sugar esters, especially sucrose monopalmitate; long-chain (from 8 to 28 carbon atoms) tertiary phosphine oxides; dialkyl sulfoxides; block copolymers of polyoxyethylene and polyoxypropylene; polyalkoxylated sorbitan esters; fatty esters of sorbitan, poly(ethylene oxide) and fatty acid amides modified so as to give them a hydrophobic nature (for example fatty acid mono- and diethanolamides containing from 10 to 18 carbon atoms).
Mention may be made most particularly of:
Among the amphoteric surfactants, mention may be made of:
Among the zwitterionic surfactants, mention may be made of those described in U.S. Pat. No. 5,108,660.
The preferred zwitterionic surfactants are alkyldimethylbetaines, alkylamidopropyldimethylbetaines, alkyldimethylsulfobetaines or alkylamidopropyldimethylsulfobetaines such as Mirataine JCHA or H2CHA, Mirataine CBS sold by Rhodia or those of the same type sold by Sherex Company under the names Varion CADG Betaine and Varion CAS Sulfobetaine, products of condensation of fatty acids and protein hydrolysates. Other zwitterionic surfactants are also described in U.S. Pat. No. 4,287,080 and in U.S. Pat. No. 4,557,853.
Among the cationic surfactants, mention may be made especially of the salts of quaternary ammoniums of formula:
R1R2R3R4N′X−
in which
Mention may be made in particular of dodecyltrimethylammonium bromide, tetradecyltrimethylammonium bromide, cetyltrimethylammonium bromide, stearylpyridinium chloride, Rhodaquat® TFR and Rhodamine® C15 sold by Rhodia, cetyltrimethylammonium chloride (Dehyquart ACA and/or AOR from Cognis) and cocobis(2-hydroxyethyl)ethylammonium chloride (Ethoquad C12 from Akzo Nobel).
Mention may also be made of other cationic surfactants such as:
Mention may be made in particular of: dialkyldimethylammonium chlorides such as ditallowdimethylammonium chloride or methyl sulfate, etc., alkylbenzyldimethylammonium chlorides,
Additional examples of suitable surfactants are compounds generally used as surfactants denoted in the well-known manuals “Surface Active Agents”, volume I by. Schwartz and Perry, and “Surface Active Agents and Detergents”, volume II by Schwartz, Perry and Berch.
The surfactants may represent from 0.005% to 60%, especially 0.5% to 40% of the weight of the composition of the invention, as a function of the nature of the surfactant(s) and of the intended use of the cleaning composition.
Advantageously, the nanogel/surfactant(s) weight ratio is between 1/1 and 1/1000 and advantageously between 1/2 and 1/200.
The composition, preferably the cleaning or rinsing composition according to the invention, may also comprise at least one other additive, chosen especially from the usual additives present in compositions for cleaning or rinsing hard surfaces.
Mention may be made especially of:
The pH of the composition forming the subject of the invention or the working pH of said composition may range from 0.5 to 14 and preferably from 1 to 14.
The compositions of alkaline type, with a pH of greater than or equal to 7.5 and preferably greater than 8.5 for household uses (most particularly with a pH from 8.5 to 12 and especially from 8.5 to 11.5) are particularly suitable for removing greasy soiling and are particularly suited to kitchen cleaning. They may comprise from 0.001% to 5% and preferably from 0.005% to 2% of their weight of the nanogel.
The alkaline compositions generally comprise, in addition to the nanogel, at least one additive chosen from:
Said alkaline compositions may be in the form of a ready-to-use formulation or alternatively of a dry or concentrated formulation to be diluted especially in water before use; they may be diluted from 1 to 10 000-fold and preferably from 1 to 1000-fold before use.
Advantageously, a kitchen cleaning formulation comprises:
The pH of such a formulation is preferably from 7.5 to 13 and more preferentially from 8 to 12.
The compositions of acidic type, with a pH of less than 5, are particularly useful for removing soiling of mineral type; they are particularly suited to cleaning toilet pans.
They may comprise from 0.001% to 5% and preferably from 0.01% to 2% of their weight of the nanogel.
The acidic compositions generally comprise, in addition to the nanogel:
Said acidic compositions are preferably in the form of a ready-to-use formulation.
Advantageously, a formulation for cleaning toilet pans comprises:
A few other particular embodiments and applications of the composition of the invention are detailed hereinbelow.
Thus, the composition according to the invention may be used for the facilitated cleaning treatment of glass surfaces, especially glazing. This treatment may be performed by various known techniques. Mention may be made in particular of the cleaning of glazing by spraying with a jet of water using devices of Karcher® type.
The amount of nanogel introduced will generally be such that, during the use of the cleaning composition, after optional dilution, the concentration of nanogel is between 0.001 g/l and 2 g/l and preferably between 0.005 g/l and 0.5 g/l.
The glazing cleaning composition according to the invention comprises:
The glazing cleaning formulations comprising said polymer may also contain:
The pH of the composition is advantageously between 6 and 11.
The composition of the invention is also advantageous for the facilitated cleaning of kitchenware in an automatic machine. Said composition may be either a detergent (cleaning) formulation used in the wash cycle, or a rinsing formulation.
The detergent compositions for washing kitchenware in automatic dishwashers according to the invention advantageously comprise from 0.01% to 5% and preferably 0.1% to 3% by weight of the nanogel.
Said dishwasher detergent compositions also comprise at least one surfactant, preferably a nonionic surfactant, in an amount that may range from 0.2% to 10% and preferably from 0.5% to 5% of the weight of said detergent composition, the rest being formed from various additives and fillers, as already mentioned above. Thus, they may also comprise:
The pH is advantageously between 8 and 13.
The compositions for the facilitated rinsing of kitchenware in an automatic dishwasher according to the invention may advantageously comprise from 0.02% to 10% and preferably from 0.1%. to 5% by weight of the nanogel relative to the total weight of the composition.
Said compositions may also comprise from 0.1% to 20% and preferably 0.2% to 15% by weight, relative to the total weight of said composition, of a surfactant, preferably a nonionic surfactant.
Among the preferred nonionic surfactants, mention may be made of surfactants such as polyoxyethylenated C6-C12 alkylphenols, polyoxyethylenated and/or polyoxypropylenated C8-C22 aliphatic alcohols, ethylene oxide-propylene oxide block copolymers, optionally polyoxyethylenated carboxylic amides, etc.
Said compositions may also comprise from 0 to 10% and preferably from 0.5% to 5% by weight, relative to the total weight of the composition, of a calcium-sequestering organic acid, preferably citric acid.
They may also comprise an auxiliary agent such as a copolymer of acrylic acid and of maleic anhydride or acrylic acid homopolymers in a proportion of from 0 to 15% and preferably 0.5% to 10% by weight relative to the total weight of said composition.
The pH is advantageously between 4 and 7.
A subject of the invention is also a cleaning composition for the facilitated washing of kitchenware by hand.
Preferred detergent formulations of this type comprise from 0.1 to 10 parts by weight of the nanogel per 100 parts by weight of said composition and contain from 3 to 50 and preferably from 10 to 40 parts by weight of at least one surfactant, preferably an anionic surfactant, chosen especially from saturated C5-C24 and preferably C8-C16 aliphatic alcohol sulfates, optionally condensed with about 0.5 to 30, preferably 0.5 to 8 and most particularly 0.5 to 5 mol of ethylene oxide, in acidic form or in the form of a salt, especially an alkali metal (sodium), alkaline-earth metal (calcium, magnesium), etc. salt.
They are preferentially foaming liquid detergent aqueous formulations for the facilitated washing of kitchenware by hand.
Said formulations may also contain other additives, especially other surfactants, such as:
The pH of the composition is advantageously between 5 and 9.
Another particular embodiment of the invention consists of a composition for the facilitated external cleaning, especially of the bodywork, of motorized vehicles (cars, trucks, buses, trains, aircraft, etc.).
In this case also, it may be an actual cleaning composition or a rinsing composition.
The cleaning composition for motor vehicles advantageously comprises from 0.005% to 10% by weight of the nanogel relative to the total weight of said composition, and also:
The minimum amount of surfactant present in this type of composition is preferably at least 0.5% of the formulation.
The pH of the composition is advantageously between 8 and 13.
The composition of the invention is also particularly suitable for the facilitated cleaning of hard surfaces of ceramic type (tiles, baths, sinks, etc.), especially for bathrooms. It may especially facilitate the cleaning of soap scum.
The cleaning formulation advantageously comprises from 0.02% to 5% by weight of the nanogel relative to the total weight of said composition, and also at least one surfactant.
Preferred surfactants include nonionic surfactants, especially the compounds produced by condensation of alkylene oxide groups of hydrophilic nature with a hydrophobic organic compound that may be of aliphatic or alkylaromatic nature.
The length of the hydrophilic chain or of the polyoxyalkylene radical condensed with any hydrophobic group may be readily adjusted to obtain a water-soluble compound having the desired degree of hydrophilic/hydrophobic balance (HLB).
The amount of nonionic surfactants in the composition of the invention may be from 0 to 30% by weight and preferably from 0 to 20% by weight.
An anionic surfactant may optionally be present in an amount of from 0 to 30% and advantageously 0 to 20% by weight.
It is also possible but not obligatory to add amphoteric, cationic or zwitterionic detergents.
The total amount of surfactant compounds used in this type of composition is generally between 0.5% and 50%, preferably between 1% and 30% by weight and more particularly between 2% and 20% by weight relative to the total weight of the composition.
Said cleaning composition may also comprise other minor ingredients, such as:
The pH of the composition is advantageously between 2 and 12.
The composition according to the invention is also suitable for the facilitated rinsing of shower walls.
The aqueous compositions for rinsing shower walls comprise from 0.02% to 5% by weight and advantageously from 0.05% to 1% of the nanogel.
The other main active components of the aqueous shower rinsing compositions of the present invention are at least one surfactant present in an amount ranging from 0.5% to 5% by weight and optionally a metal-chelating agent as mentioned above, present in an amount ranging from 0.01% to 5% by weight.
The aqueous shower rinsing compositions advantageously contain water with, optionally, at least one lower alcohol in major proportion and additives in minor proportion (between about 0.1% and about 5% by weight, more advantageously between about 0.5% and about 3% by weight and even more preferentially between about 1% and about 2% by weight).
Certain surfactants that may be used in this type of application are described in U.S. Pat. Nos. 5,536,452 and 5,587,022, the content of which is incorporated by reference into the present description.
Preferred surfactants are polyethoxylated fatty esters, for example polyethoxylated sorbitan oleates and polyethoxylated castor oil. Particular examples of such surfactants are the products of condensation of 20 mol of ethylene oxide and of sorbitan monooleate (sold by Rhodia Inc. under the name Alkamuls PSMO-20® with an HLB of 15.0) and 30 or 40 mol of ethylene oxide and castor oil (sold by Rhodia Inc. under the name Alkamuls EL-620® (HLB of 12.0) and EL-719® (HLB of 13.6), respectively). The degree of ethoxylation is preferably sufficient to obtain a surfactant with an HLB of greater than 13.
The pH of the composition is advantageously between 7 and 11.
The composition according to the invention may also be used for the facilitated cleaning of vitroceramic plates.
Advantageously, the formulations for cleaniny vitroceramic plates of the invention comprise:
The pH of the composition is advantageously between 7 and 12.
As mentioned above, the composition according to the invention may also be used in the field of industrial cleaning, especially for the facilitated cleaning of reactors.
Advantageously, said compositions comprise:
The pH of such a composition is generally from 8 to 14.
Another subject of the invention consists of the use, in a composition, preferably comprising at least one surfactant, for the modification and/or treatment of hard surfaces, preferably for the cleaning or rinsing in aqueous or aqueous-alcoholic medium of hard surfaces, of the nanogel, for example as an agent for affording said surfaces properties of antideposition and/or anLiadhesion of soiling liable Lo be deposited on said surfaces.
Another subject of the invention consists of a process for treating and/or modifying hard surfaces, in order to improve the properties of compositions optionally comprising at least one surfactant, preferably for the cleaning or rinsing in aqueous or aqueous-alcoholic medium of hard surfaces, by addition of the nanogel to said compositions.
Another subject of the invention consists of a process for treating and/or modifying hard surfaces, preferably to facilitate the cleaning or rinsing of hard surfaces, by placing said surfaces in contact with a composition in aqueous or aqueous-alcoholic medium, comprising the nanogel and optionally at least one surfactant.
The nanogel is preferably used or is present in said composition in an amount that is effective for affording said surfaces properties of hydrophilicity antideposition and/or antiadhesion of the soiling liable to be deposited on said surfaces.
The nature and the amounts of the nanogel present or used in said composition, and similarly the other additives and various modes of application of said composition, have already been mentioned above.
The compositions of the invention may be foaming compositions. They may especially be compositions for washing up by hand or, in the case of manual or semi-automatic washing products, vehicle cleaning compositions. The nanogel in these compositions may stabilize the foam, especially on addition of soiling. Moreover, it may serve, in the case of washing products, as an antiredeposition agent.
Other details or advantages may emerge in the light of the examples thaL follow.
In these examples, the following abbreviations are used:
AM=acrylamide
MBA=N,N′-methylenebisacrylamide (crosslinking monomer)
MAPTAC=(3-methacrylamidopropyl)trimethylammonium chloride
APTAC=(3-acrylamidopropyl)trimethylammonium chloride
The examples marked by the letter C indicate comparative examples.
MBA=8 mol %−xanthate=2.9 mol %
0.92 g (4.42×10−1 mol) of xanthate EtOC(═S)SCH(CH3)COOCH3, 13.2 g of ethanol and 66.8 g of deionized water are placed in a two-necked round-bottomed flask on which is mounted a condenser. The reaction mixture is brought to 70° C. At this temperature, 0.153 g (3.98×10−4 mol) of V50 are added. At this moment, 2.01 g (0.013 mol) of MBA and 21.22 g (0.30 mol) of AM are added over 4 hours. During this time, at t0+2 hours and t0+4 hours, 0.052 (1.92×10−4 mol) of V50 are added, respectively. At the end of the addition, the reaction is continued for a further 2 hours.
(CES MALS) Mw=168 000. Conversion of the monomers (HPLC)>99%.
A linear copolymer containing 95 mol % of acrylamide and 5 mol % of MAPTAC, with an average molecular mass of 400 kg/mol, is prepared.
0.32 g (1.54×10−3 mol) of xanthate EtOC(═S)SCH(CH3)COOCH3, 35 g of ethanol and 51.6 g of deionized water are placed in a two-necked round-bottomed flask on which is mounted a condenser. The reaction mixture is brought to 70° C. At this temperature, 0.167 g (6.18×10−4 mol) of V50 are added. At this moment, 1.83 g (0.012 mol) of MBA, 18.4 g (0.26 mol) of AM and 3.02 g (0.014 mol) of MAPTAC are added over 4 hours. During this time, at t0+2 hours, 0.042 (1.54×10−4 mol) of V50 are added, respectively. At the end of the addition, the reaction is continued for a further 2 hours.
(CES MALS) Mw=2 900 000. Monomer conversion (HPLC)>99%.
0.32 g (1.54×10−3 mol) of xanthate EtOC(═S)SCH(CH3)COOCH3, 35 g of ethanol and 51.6 g of deionized water are placed in a two-necked round-bottomed flask on which is mounted a condenser. The reaction mixture is brought to 70° C. At this temperature, 0.162 g (5.99×10−4 mol) of V50 are added. At this moment, 1.83 g (0.013 mol) of MBA, 19.6 g (0.28 mol) of AM and 3.23 g (0.015 mol) of MAPTAC are added over 4 hours. During this time, at t0+2 hours, 0.042 (1.54×10−4 mol) of V50 are added, respectively. At the end of the addition, the reaction is continued for a further 2 hours.
(CES MALS) Mw=1 400 000. Monomer conversion (HPLC)>99%.
The mean size of the macromolecules, measured by the dynamic light scattering technique, is 98 nm.
The following compositions are prepared (per 1000 g of composition):
Formulation 1
0.8 g LABS (linear alkyl benzenesulfonate, anionic surfactant)
0.5 g Rhodasurf L7/90 (nonionic surfactant)
2 g sodium tripolyphosphate
test polymer: nature and amounts given in the results section
1.5 g Na2SO4
tap water up to 1000 g.
Formulation 2
0.8 g LABS (linear alkyl benzenesulfonate, anionic surfactant)
0.5 g Rhodasurf L7/90 (nonionic surfactant)
1.5 g sodium tripolyphosphate
test polymer: nature and amounts given in the results section
2 g Na2SO4
tap water up to 1000 g.
The foam index and the persistence of the foam are tested according to the protocol detailed below.
The soiling redeposition effect is tested on laundry with the aid of the protocol detailed below.
Foam Index and Foam Persistence Tests
The foam index and the foam persistence, for a test composition, are determined using the cylinder device below, according to the protocol below.
Description of the Cylinder Device
The device has six parallel Plexiglas® cylinders fixed to a rotating frame. Each cylinder has an inside diameter of 9 cm and a working height of 29 cm. Each cylinder comprises a graduated scale for measuring the foam height. The cylinders are fixed onto a rotating frame, each occupying a position equivalent to the others. The frame, driven by an electric motor, is made to rotate about itself, driving the cylinders in rotation along an axis perpendicular to their length crossing said cylinders at the middle of their length in the plane of the frame. The composition in a cylinder flows in the cylinder and hits its extremities (the bottom and the top) during the rotation, thus generating turbulence leading to the formation of foam. Each cylinder is closed with a removable cap, pierced with a hole 8 mm in diameter allowing the addition of additives (soiling, etc.). This hole is stoppered using a rubber stopper when the cylinders are placed in rotation. The foam height is determined by reading the graduated scale when the cylinders are in the vertical position after rotation:
Foam height=height of (foam+liquid composition)−height of liquid composition.
The foam height unit (FHU) is defined as follows: 10 FHU corresponds to a foam height of 25 mm.
The rotation speed is 20 revolutions per minute. The cylinders are placed in rotation in series of 10 rotations (which each last 30 seconds), followed by 3 minutes of standing between each series, so as to allow measurement of the foam height (performed at the end of the three minutes) and the optional addition of soiling.
Each cylinder contains 500 ml of test composition. The test composition has an initial controlled temperature of 20° C.
Protocol for Measuring the Foam Index:
500 ml of test composition are placed in a cylinder, taking care to avoid the formation of foam. The frame bearing the cylinders is then placed in rotation in six series of 10 rotations (total of 60 rotations), each series being followed by a waiting time of 3 minutes. The foam height in the cylinder after the 3 minutes is recorded.
The foam index is defined as the foam height, given as FHU, after the 6th 3-minute waiting period.
For the sake of accuracy, each measurement is repeated at least twice, and the foam index is the average.
Foam Persistence Protocol:
After the sixth series of (10 rotations+3 minutes of waiting time), an addition implementation is performed by adding to the cylinder 5 drops (0.15 g calibrated with a laboratory balance) of hot (80° C.) liquid soiling. The cylinder is then subjected to 10 subsequent rotations at 20 revolutions per minute. The foam height is then measured after 3 minutes following the 10 rotations (total of 60+10=70 rotations). The soiling addition implementation may be repeated by adding the soiling just after measuring the foam height and just before the subsequent rotation.
The rotations/waiting/measurement/addition of soiling implementation is repeated until the foam height reaches a value of less than 10 FHU.
For the sake of accuracy, each measurement is repeated at least twice, and the average is reported.
The foam height may be plotted or reported as a function of the number of rotations (the soiling is added only after 60 rotations). The foam height (foam persistence) during the addition of soiling is of particular interest. A small decrease in foam indicates stabilization of the foam in the presence of soiling.
Soiling Composition
The soiling used in the example is synthetic sebum simulating fat soiling, for instance that originating from human skin, mixed with a clay (bentonite) simulating particulate soiling (dust, etc.). The weight ratio between the synthetic sebum and the clay is 12/4.
Composition per 950 g of synthetic sebum:
Preparation: The ingredients are placed in a Pyrex® beaker and heated at 80° C. for 15 minutes, with magnetic stirring on a hotplate. The liquid formed is transparent and weakly colored. On cooling, it forms a white opaque waxy paste, which may be stored for several weeks in a freezer.
At the time of evaluation of the foam persistence, the final soiling is prepared by melting 12 of sebum, at 80° C. with mechanical stirring, and adding thereto 4 g of clay. The soiling, which has become opaque and slightly viscous, is stirred throughout the operation. A fresh sample of mixture is prepared for each new experiment, and the soiling is never kept for more than one hour.
Protocol for Testing the Redeposition of Soiling on Laundry
The test is performed in several steps:
preparation of the fabric—white cotton fabric is used. The finishing is removed by washing with hot water without washing product
measurement of the color of the fabric (white)—washing of the white fabric is performed with the test laundry product alone. After drying, the color of the fabric is measured using a colorimetric probe (LUCI reflectometer)
deposition of soiling (clay+water)—the soiling is deposited on the fabric, this soiling being formed from a water/bentonite mixture with 10 g of bentonite per 100 g of water. To deposit the soiling, the fabric is dipped in the mixture and is stirred using a tergotometer for 7 minutes
drying at room temperature
measurement of the color before washing
washing of the fabric
drying at room temperature
measurement of the color after washing
The test laundry product, used for the washes, is a Brazilian washing product of ACE brand, to which is added the test polymer. 0.025 g of active polymer is used per 5 g of washing product.
A percentage of removal of the soiling is calculated as follows:
“white”=specimen prewashed only
“before washing”=specimen prewashed and stained
“after washing”=specimen prewashed, stained and washed
The reflectometer is equipped with software that directly calculates the Delta E (experimental detergency) from the data recorded previously on the fabric before and after washing. This value corresponds to the recorded color variation and is expressed as follows:
Delta L=Lafter washing−Lbefore washing
Delta a=aafter washing−abefore washing
Delta b=bafter washing−bbefore washing
Similarly, by means of the data recorded on the fabric before and after staining, the software makes it possible to calculate the Delta E′ (theoretical maximum detergency) as follows:
Delta L′=Lwhite−Lbefore washing
Delta a′=awhite−abefore washing
Delta b′=bwhite−bbefore washing
% REMOVAL=100×EXPERIMENTAL DET./THEORETICAL DET.
The percentage of removal is reported below as a value related to the redeposition (the higher the value, the lower the redeposition).
Results
The following compositions are prepared:
The surface modification is evaluated using the compositions according to the following protocol.
Small black ceramic tiles are used. The first operation consists in preparing the tile. To do this, it suffices to clean it with ethanol using a paper towel. Half the surface is treated with the test composition (comprising a polymer) and the other half with the control composition. To do this, 5 drops of product are added and spread out using a paper towel. The tile dries for 1 minute and is then rinsed with a stream of 4.5 L/minute for 5 seconds on each side. The tile dries again in the vertical position. The soiling is prepared from a soap solution at 13% by mass in water and from a solution at 35% by mass in ethanol of MgCl2.6H2O. The soap solution is heated so as to make it liquid. 10.5 g of this solution are added to 18 g of ethanol, followed by addition of 1.5 mL of the MgCl2 solution. Five drops of the model soiling are immediately deposited (before precipitation) onto the tile on both halves. The soiling is then dried in an oven at 40° C. for 25 minutes. It is then rinsed off at a flow rate of 6 L/minute for 3 minutes. If the soiling leaves before the allotted time, the time is noted in order to make differentiations between the compositions, if necessary. The test consists in evaluating the amount of soiling that has left using a scale that goes from 0 to 5. The best compositions are those for which the note 5 is obtained. For the consecutive cycles, further soiling is added once the tile is dry, without adding further composition. The soiling is then dried in the oven, etc.
Results
The composition of the invention allows efficient and long-lasting treatment, which is resistant to rinsing.
A composition is prepared, comprising:
The kinetics of adsorption of the nanogel of the composition on a silicon oxide wafer (surface similar to that of a glass or ceramic surface, available from Silicon Inc., under the description “100 mm Silicon Wafers, single side polished, P-type, (100) orientation, thickness 500-550 microns, with 1000 (±3%) Angstroms SiO2 applied, clean room processed and packaged”) are monitored by reflectometry. The process is performed by comparison using a reference comprising distilled water and 10−3 M KCl, according to the method below:
The technique is based on light reflection: a polarized beam of an He—Ne laser (632.8 nm) penetrates a cell via a glass prism at the Brewster angle at the water/silicon interface) (71°) on a silicon wafer covered with a thin film of the adsorbent support to be studied. The beam is reflected and then split into two components (perpendicular Is and parallel Ip) and then recovered by photodiodes. The magnitude recorded during the adsorption is ΔS═S-So in volts. So is the value of S=Ip/Is in the presence only of the solvent in the cell with the substrate. The measurement is taken at the “stagnation” point. At this point, no flow exists, so as to avoid coupling between the molecule transport mechanism and its organization at the surface. The flow of solution of polymer to be studied is conveyed into the cell only by difference in level; it must be laminar of the order of 2 ml/minute. To calculate the adsorbed amount Γ, it is necessary to determine using an optical model the sensitivity factor As. This factor depends on the wavelength of the laser, the angle of incidence, the thickness of the adsorbent and the refractive indices of the solvent and of the surface. It is then possible to deduce the adsorbed amount Γ in mg/m2 via the relationship Γ=(1/As)(ΔS/So). (As=0.1711*dn/dc=0.1711*0.17=0.029).
The resistance of the adsorption to rinsing with a solution comprising distilled water and 10−3 M KCl is tested.
Results:
Compositions are prepared, comprising:
Treatment/modifications of the surfaces: 10 cm×15 cm glass plates are used. The plates are washed with a Decon 90 10% alkaline solution. Next, they are rinsed with tap water and then with distilled water. They are wiped with a paper towel (precision wipes, Kimtech, Kimberly-Clark) and sprayed with the above compositions. The tiles are again wiped with a paper towel and left to dry for about 30 minutes.
the contact angle of a drop of distilled water is measured using a goniometer (Rame-hart Inc. NRL C.A. Goniometer, model No. 100-00-230), before and after the above treatment/modification. The final value is reported. A low value for the final value indicates large hydrophilic character.
| Number | Date | Country | Kind |
|---|---|---|---|
| 08 05854 | Oct 2008 | FR | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2009/063670 | 10/19/2009 | WO | 00 | 6/27/2011 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2010/046342 | 4/29/2010 | WO | A |
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| 20110271460 A1 | Nov 2011 | US |
