COSMETIC

Abstract: A cosmetic composition acts as a film former resistant to various effects and comprises a copolymer of a fluoroalkyl (meth)acrylate and a long chain, linear alkyl (meth)acrylate. It may further comprise a volatile oil one or more solid fats.

Description: This invention relates to a cosmetic. More particularly, it relates to a cosmetic causing no irritation on the skin which contains copolymer(s) of long-chain alkyl (meth)acrylate(s) with (meth)acrylate(s) having a bonded fluoroalkyl group readily soluble in volatile oil for cosmetics as a film-forming component which makes said cosmetic resistant against water, oil and physical friction. Conventional cosmetics may be classified into those of aqueous, nonaqueous, emulsion and powder types. Among them, aqueous, emulsion and powder cosmetics are deteriorated by moisture such as sweat, tear, rain or snow, while emulsion, powder and nonaqueous ones are deteriorated by oil such as sebum and oily components of foods and drinks. Further-each of them is deteriorated by physical friction with, for example, clothes or cups, which makes it impossible to maintain its makeup effect. Thus it has been attempted to add polymer(s) to a cosmetic to thereby form a film on the skin after applying the cosmetic thereon, thus improving the adhesion between pigment and solid fat contained in the cosmetic and the skin and prolonging the duration of the makeup effect. In order to achieve this object, it has been mainly attempted to develop aqueous or emulsion type of cosmetics containing water-soluble polymers such as vinyl acetate or acrylic polymers as a film-forming component or nonaqueous type of cosmetics wherein oil-soluble polymers such as rosin, shellac or alkylcellulose are added as a film-forming component with a solvent. FR-A-2 258 166 discloses a process for waving or straightening hair by treatment with a composition containing copolymers of a flouroalkyl(meth)acrylate and an alkyl(meth)acrylate, either of the straight-chain or the branched type, having from 1 to 18 carbon atoms in the alkyl group. GB-1,049,063 discloses compositions providing a protective coating for the skin containing copolymers of (N-ethylperflouro-dodecanesulphonanido)-ethyl methacrylate and octadecyl- or dodecyl methacrylate. However the film of a cosmetic containing water-soluble polymer(s) exhibits an unsatisfactory water resistance although it is highly resistant against oil and physical friction. Further it is difficult to prepare rigid solid products such as sticks or pencils from aqueous or emulsion type of cosmetics. On the other hand, a cosmetic containing oil-soluble polymer(s) may be blended with solid fat to thereby form a solid product such as a stick or a pencil. The solid product thus produced forms a film which exhibits an excellent water resistance and a poor oil resistance. Conventional oil-soluble polymers such as rosin, shellac or alkyl-cellulose can not be dissolved in volatile oil for cosmetics such as low-boiling point hydrocarbons or dimethylpolysiloxane at room temperature so that cosmetics containing the same can not be homogeneously spread on the skin or mucosa. Thus these cosmetics give an unsatisfactory touch in application and poor adhesion to the skin or mucosa and exhibit a poor frictional resistance. In addition, many natural resins including rosin and shellac would show a sensitizing activity, which brings about a problem from the viewpoint of safety. Thus conventional cosmetics containing polymer(s) are far from satisfactory from various viewpoints including the duration of the makeup effect, touch, and obtained makeup condition. Therefore it has been required to develop a cosmetic containing highly safe polymer(s) which forms a film resistant against physical friction as well as water and oil and can be homogeneously dissolved in a solvent used for cosmetics while undergoing no decrease in the touch. It is also expected that such an cosmetic can be formulated into a solid product such as a stick or a pencil. Summary of the Invention The invention provides a cosmetic composition comprising: (A) 0.1 to 70 percent by weight of a co-polymer of a fluoroalkyl (meth) acrylate and a straight-chain alkyl (moth) acrylate having 18 or more carbon atoms in the alkyl group, and (B) 1 to 50 percent by weight of a volatile oil selected from the group consisting of straight or branched hydrocarbons and cyclic dimethylpolysiloxanes, each having a boiling point of not higher than 260°C. The copolymer to use in the invention is highly safe and readily soluble in a solvent mixture of low-boiling point hydrocarbons containing a large amount of highly safe volatile oil for cosmetics, such as a cyclic dimethylpolysiloxane, exhibits an excellent water resistance as well as an excellent oil resistance because of the presence of fluorine moiety in the copolymer(s) when applied to the skin, can be homogeneously spread on the skin because of its high solubility in solvents and forms a film showing satisfactory adhesion and a high frictional resistance. We have further found that the abovementioned polymer(s) is oil-soluble and readily soluble in a solvent so that it may be formulated into solid products such as oily sticks or pencils having an extremely-preferable touch and that the film-forming property of the polymer(s) and the effect of maintaining the makeup condition of the obtained film are both satisfactory, thus completing the present invention. Preferable examples of the long-chain alkyl (meth)acrylate used in the present invention are esters of straight-chain alkyl alcohols having eight or more carbon atoms, e.g. long-chain alcohols such as octyl, decyl, lauryl, cetyl, stearyl or behenyl alcohol with (meth)acrylic acid. Esters of long-chain alcohols having 18 or more carbon atoms are particularly preferable. Examples of the (meth)acrylate having a bonded fluoroalkyl group are known compounds having a bonded polyfluoroalkyl or perfluoroalkyl group, such as CH₂=CHCOOC₂H₄C₆F₁₃, CH₂=CHCOOC₂H₄C₈F₁₇, CH₂=CHCOOC₂H₄C₁₀F₂₁, CH₂=CHCOOC₂H₄C₁₂F₂₅, CH₂=C(CH₃)COOC₂H₄C₆F₁₃, CH₂=C(CH₃)COOC₂H₄C₈F₁₇, CH₂=C(CH₃)COOC₂H₄C₁₀F₂₁, CH₂=C(CH₃)COOC₂H₄C₁₂F₂₅, CH₂=CHCOOC₂H₄-(CF₂)₆-H, CH₂=CHCOOC₂H₄-(CF₂)₈-H, CH₂=C(CH₃)COOC₂H₄-(CF₂)₆-H and CH₂=C(CH₃)COOC₂H₄-(CF₂)₈-H. The long-chain alkyl (meth)acrylate and (meth)acrylate having a bonded fluoroalkyl group may be copolymerized preferably in a ratio by weight of 10 : 1 to 1 : 5, still preferably 7 : 1 to 1 ; 1, considering the relationship between the solublity and stickness. The copolymer may contain a third monomer unit. The molecular weight of the copolymer may be preferably 1000 to 2,000,000, still preferably 10,000 to 500,000, considering the relationship between the frictional resistance and stickness of the same. In addition to the copolymer(s) of long-chain alkyl (meth)acrylate(s) and (meth)acrylate(s) having a bonded fluoroalkyl group, which are the essential components, the cosmetic of the present invention may further contain conventional components such as various volatile and nonvolatile oils, surfactants, wetting agents, preservatives, antioxidants, perfumes and powder constitutents if required. The volatile oil preferably includes straight or branched hydrocarbons and cyclic dimethylpolysiloxanes, each having a boiling point of not higher than 260°c. Examples of the nonvolatile oils are straight-chain or branched hydrocarbons optionally unsaturated, synthetic ester oils derived from higher alcohols and fatty acids, higher alcohols, higher fatty acids and waxes. Examples of the surfactants are polyoxyethylene alkyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, sorbitan fatty acid esters, glycerol fatty acid esters, polyoxyethylene hardened castor oil and polyoxyethylene sorbitol fatty acid esters. Examples of the wetting agents are sorbitol, glycerol, propylene glycol, 1,3-buthylene glycol, maltitol, lactic acid, sodium lactate and polyethylene glycol. Examples of the preservatives are alkyl p-hydroxybenzoates, sodium benzoates, potassium sorbate and phenoxyethanol. Examples of the antioxidants are tocopherol, sesamol, sesamolin and lecithin. Examples of the powder constituents are titanium oxide, zinc oxide, ultramarine blue, chromium oxide, iron oxide, talc, sericite, mica, kaolin, micaceous titanium and organic pigments. The cosmetic of the present invention may furthermore contain conventional film-forming component(s) such as various resins including acrylate and vinyl acetate resins in addition to the copolymer(s) of the invention depending on the form of the products. The copolymer(s) of long-chain alkyl (meth)acrylate(s) with (meth)acrylate(s) having a bonded fluoroalkyl group are contained in the cosmetic of the present invention preferably in an amount of 0.1 to 70% by weight, more preferably 0.5 to 40% by weight, of the total cosmetic. A content of the same lower than 0.1% by weight might result in a poor film-forming effect, while a content of the same exceeding 70% by weight might sometimes result in insufficient dispersion caused by an unbalanced composition. When the composition contains a volatile oil, it preferably contains 0.1 to 50 wt.%, more preferably 1 to 30 wt. % , based on the oil, of the copolymer. The cosmetic of the present invention may be prepared by, for example, mixing the essential components, i.e. copolymer(s) of long-chain alkyl (meth)acrylate(s) and (meth)acrylate(s) having a bonded fluoroalkyl group, and other components, if any, by heating with the use of, e.g., a homomixer, a homodisperser or a three-roll mixer and formulating the mixture into a desired form if required. The cosmetic of the present invention may be appropriately used as a skin cosmetic and formulated into various makeup products such as foundation, lipstick, eyeliner, mascara, eyebrow or rouge. These skin cosmetics may be prepared by mixing the film-forming components comprising the above-mentioned copolymer(s) with volatile and nonvolatile oils including solid fats as well as other desired components by heating with the use of, for example, a homomixer, a homodisperser or a three-roll mixer and formulating the mixture into desired forms. Thus oily solid cosmetics such as sticks or pencils having excellent proprieties can be obtained. It is below disclosed how a copolymer to be used in the invention was produced. Referential Example 1 26.7 g of perfluoroalkyl methacrylate 80.0 g of stearyl methacrylate and 30 g of toluene were introduced into a four-necked flask and dissolved and mixed therein followed by stirring at 50°C for 0.5 hour under a nitrogen gas stream. Then 1.1 g of 2,2'-azobis-2,4-dimethylvaleronitrile was added thereto and the mixture was polymerized at 65°C for five hours under a nitrogen gas stream and then at 80°C for additional one hour to thereby give a white viscous solution. After the polymerization, the obtained solution was diluted with toluene and poured into ethanol to thereby precipitate a copolymer product, which was then filtered and dried in vacuo. Thus 102.4 g of a copolymer of perfluoroalkyl methacrylate with stearyl methacrylate was obtained. The monomer composition of the obtained copolymer was almost the same as that of the feed (the content of the perfluoroalkyl methacrylate was 25.1% by weight based on F%). Referential Example 2 The procedure of Referential Example 1 was repeated except that 50 g of perfluoroalkyl methacrylate 50 g of stearyl methacrylate, 50 g of toluene and 1.0 g of 2,2'-azobis-2,4-dimethylvaleronitrile were employed to thereby give 96.0 g of a copolymer of perfluoroalkyl methacrylate with stearyl methacrylate. The content of the perfluoroalkyl methacrylate in the polymer was 49.6% by weight and almost the same as that of the feed. Referential Example 3 The procedure of Referential Example 1 was repeated except that 26.7 g of polyfluoroalkyl methacrylate was employed to thereby give 101.4 g of a copolymer of polyfluoroalkyl methacrylate with stearyl methacrylate. The content of the polyfluoroalkyl methacrylate in the copolymer was 24.8% by weight and almost the same as that of the feed. Referential Example 4 The procedure of Referential Example 1 was repeated except that 50 g of polyfluoroalkyl methacrylate 50 g of stearyl methacrylate, 50 g of toluene and 1.0 g of 2,2'-azobis-2,4-dimethylvaleronitrile were employed to thereby give 97.0 g of a copolymer of polyfluoroalkyl methacrylate with stearyl methacrylate. The content of the polyfluoroalkyl methacrylate in the copolymer was 50.4% by weight and almost the same as that of the feed. Referential Example 5 The procedure of Referential Example 1 was repeated except that the stearyl methacrylate was replaced by behenyl methacrylate to thereby give 103.5 g of a copolymer of perfluoroalkyl methacrylate with behenyl methacrylate. The monomer composition of the copolymer was almost the same as that of the feed (the content of the perfluoroalkyl methacrylate was 24.9% by weight based on F%). Example 1 The solubility of rosin ester (mfd. by Arakawa Chemicals, Co., Ltd.), which was a conventional oil-soluble film-forming agent, in a volatile oil was compared with that of each copolymer of a long-chain alkyl (meth)acrylate with a (meth)acrylate having a bonded fluoroalkyl group prepared in Referential Examples 1 to 5 according to the present invention in the following manner. Table 1 shows the result. Solubility: 0.2 g of the rosin ester or the copolymer for use in the present invention and 1 g of a mixture of a low-boiling point hydrocarbon (IP Solvent 1620; mfd. by Idemitsu Oil Co., Ltd.) and a cyclic dimethylpolysiloxane (SH244; mfd. by Toray Silicone Co., Ltd.) were introduced in a screwed bottle followed by sealing. The mixture was stirred at 90°C for 30 min and allowed to stand for two days. Then the dissolution state in the bottle was observed with the naked eye. Criterion: o : clear dissolution, ▵ : white dispersion, x : separation (crystallization). Table 1 obviously suggests that each copolymer for use in the present invention has an extremely high solubility and can be dispersed or dissolved in cyclic dimethylpolysiloxane having a high safety by simply adding a small amount of the low-boiling hydrocarbon. Example 2 A solution of rosin ester or each copolymer prepared in Referential Examples 1 to 5 in a solvent mixture of IP1620 and SH244 of a weight ratio of 10/90 as used in Example 1 was mixed again by stirring at 90°C for 30 min. Immediately thereafter, 1 cc of the solution was dropped on a glass plate and allowed to stand at room temperature for two days. Then properties of the films thus formed on the plates were compared with each other. Table 2 shows the result. Criterion: o : good, ▵ : somewhat good, x : poor. Example 3 Lipsticks of the following composition were produced with the use of the rosin ester and copolymers for use in the present invention as a film-forming agent in the following manner. The effects of use of the obtained products were compared with each other. Table 3 shows the result. Composition parts by weight film-forming agent 10 IP Solvent 1620 7 SH244 49 candelilla wax 7 ceresin 3 pearlescent pigment 12 titanium oxide 1 organic pigment 1 100 Method for production: Four parts by weight of IP Solvent, one part by weight of ceresin and one part by weight of the organic pigment were mixed with a roll mill to give a pigment paste. Separately the residual amount of IP Solvent, SH244, the film-forming agent, the residual amount of the ceresin and candelilla wax were mixed by heating at 90°C and the above-mentioned pigment paste and the powder constituent were dispersed therein followed by molding in a container. Method for test: Spreadability - Each lipstick was applied on the skin and subjected to organoleptic evaluation. Homogeneity - do. Frictional resistance - Each lipstick was applied on the skin, allowed to stand at room temperature for a sufficient period and subjected to repeated friction under a given pressure with a sponge puff. The color migration thus induced was observed with the naked eye. Water resistance - Each lipstick was applied on the skin and allowed to stand at room temperature for a sufficient period. Then water was added dropwise thereto in an amount sufficient to moisten the whole film. After 10 min, the condition was observed with the naked eye. Oil resistance - Each lipstick was applied on the skin and allowed to stand at room temperature for a sufficient period. Then liquid paraffin was added dropwise thereto in an amount sufficient to moisten the whole film. After ten min, the condition was observed with the naked eye. Stickiness - Each lipstick was applied on the skin and allowed to stand at room temperature for a sufficient period. Then the stickiness thereof was evaluated by pressing with fingers. Criterion: o ○ : good, o : somewhat good, ▵ : somewhat poor, x : poor. The above result suggests that each cosmetic of the present invention can be homogeneously spread on application and the film formed after the application was highly resistant against friction, water and oil and showed a low stickiness. The stickiness tended to decrease with an increase in the chain-length of the alkyl (meth)acrylate or in the content of the fluorinated (meth)acrylate. Example 4 An eyeliner of the following composition was produced. Composition parts by weight copolymer of Ref. Ex. 1 10 IP Solvent 1620 8 SH244 52 candelilla wax 5 ceresin 3 microcrystalline wax 1.2 black iron oxide 20 polyoxyethylene sorbitan monolaurate 0.2 glycerol monostearate 0.4 perfume 0.2 100 The obtained eyeliner was extremely homogeneously spread and showed an excellent adhesion to the skin as well as high resistance against water and oil. Example 5 A stick-type foundation of the following composition was produced. Composition parts by weight copolymer of Ref. Ex. 4 10 SH244 4 IP Solvent 1620 39 candelilla wax 10 solid paraffin 6 cerisite 18 yellow iron oxide 4 red iron oxide 2 black iron oxide 2 titanium oxide 4.5 perfume 0.5 100 The obtained foundation was extremely homogeneously spread and showed an excellent adhesion to the skin as well as high resistance against water and oil with little stickiness. Example 6 A stick-type eye shadow of the following composition was produced. Composition parts by weight copolymer of Ref. Ex. 5 10 IP Solvent 1620 4 SH244 39 candelilla wax 8 ceresin 5 pearlescent pigment 20 mica 12 titanium oxide 1.8 perfume 0.2 100 The obtained eye shadow was homogeneously spread and showed an excellent adhesion to the skin as well as high resistance against water and oil with little stickiness. Example 7 An oily, solvent-type mascara of the following composition was produced. Composition parts by weight copolymer of Ref. Ex. 2 15 solid paraffin 15 IP Solvent 55 SH244 5 pigment 10 perfume a trace amount Method for production: Some portion of IP Solvent, SH244 and some portions of the copolymer and solid paraffin were mixed together and dissolved by heating. Separately the residual IP Solvent was mixed with the residual solid paraffin and the pigment paste was added thereto. The mixture was mixed with a roll mill and dispersed in the copolymer liquid part followed by cooling. Evaluation: The obtained mascara applied on eyelashes was highly resistant against water, i.e. not washed away by tear. It was further resistant against friction such as winks. Example 8 A stick-type eyebrow of the following composition was produced. Composition parts by weight copolymer of Ref. Ex. 5 10 IP Solvent 7 SH244 35 ceresin 1 solid paraffin 36 pigment 11 Method for production: All materials other than the pigment were molten and the pigment was added and thoroughly dispersed therein. The dispersion was mixed with a heated roll mill several times, cooled to room temperature and extruded with an extruder having a nozzle of an internal diameter of 3 mm. Evaluation: The obtained eyebrow was resistant against water and friction and hardly deteriorated. Example 9 A manicure of the following composition was produced. Composition parts by weight copolymer of Ref. Ex. 2 12 nitrocellulose 15 camphor 6 butyl acetate 25 ethanol 7 toluene 30 corolant an appropriate amount The obtained manicure was appropriate for application and showed an excellent adhesion to the nail.

Claims: A cosmetic composition comprising: (A) 0.1 to 70 percent by weight of a co-polymer of a fluoroalkyl (meth) acrylate and a straight-chain alkyl (meth) acrylate having 18 or more carbon atoms in the alkyl group, and (B) 1 to 50 percent by weight of a volatile oil selected from the group consisting of straight or branched hydrocarbons and cyclic dimethylpolysiloxanes, each having a boiling point of not higher than 260°C. A composition as claimed in claim 1, in which the weight ratio of the straight-chain alkyl (meth) acrylate to the fluoroalkyl (meth) acrylate is from 7:1 to 1:1. A composition as claimed in claim 1 or 2, characterised in that component (A) is present in an amount of from 0.5 to 40 percent by weight. A composition as claimed in any of claims 1 to 3, characterised in that component (B) is present in an amount of from 1 to 30 percent by weight. A composition as claimed in any one of claims 1 to 4 further comprising: (C) a powder component selected from one or more of titanium oxide, zinc oxide, ultramarine blue, chromium oxide, iron oxide, talc, sericite, mica, kaolin, micaceous titanium and organic pigments.

Inventors: FUKASAWA, JUNICHI, SATO, YUJI, SHIDA, JUN, YASUDA, YUTAKA
Applicants: KAO CORPORATION
Application year: 1986
Main classification: A61K7
IPC codes: A61K8, A61Q1, A61Q3