EMULSIFIED HAIR COSMETIC

Abstract: An emulsified hair cosmetic for providing easy combing and a feeling of smoothness to hair, and for protecting hair against heat and brushing, which comprises (i), a dimethylsilicone rubber of the formula: wherein R¹ and R² are methyl or hydroxyl; and n is an integer of 4000 to 9000, (ii) one or more specified polyalcohols, and (iii) one or more specified nonionic surfactants, the weight proportion of (iii):(i) being not more than 4:1 and the weight proportion of (iii):(ii) being in the range 1:2 to 2:1.

Description: The present invention relates to an emulsified hair cosmetic providing excellent easy combing and a feeling of smoothness to hair and protecting hair against heat and brushing. Various hair treating compositions such as a hair treatment preparation, a hair rinse, etc. have been used to provide gloss and elasticity to hair, or to take care of injured hair. For example, in order to provide gloss to hair, hair treating compositions in which oily ingredients such as silicone oil, higher alcohol, liquid paraffin, ester oil, etc. are formulated have been used. Further, in order to provide softness and antistatic effect to hair, hair treating compositions in which a cationic surfactant or a cationic high polymer is formulated have been used. Furthermore, in order to protect hair against heat (of drier, etc.), hair treating compositions in which a water-soluble high polymer is formulated have been used. However, when a hair treating composition in which the above oily ingredients are formulated is applied to hair it causes a feeling of extraneous matter, such as sticking. The hair treating composition itself also has stickiness, therefore the physical resistance against combing or brushing becomes large. Further, a hair treating composition in which cationic surfactant or cationic high polymer is formulated electrically adsorbs only at the part of a surface of hair charged negative, so that the adsorptivity is too low and the homogeneity and the combing are not satisfactory. Furthermore, hair treating compositions in which water-soluble high polymers are formulated have a remarkable sticking and adhesion themselves; therefore after treatment they cause a feeling of extraneous matter, such as stiffness, and combing is not satisfactory. A hair care product using a silicone rubber and, further, a skin care composition having water resistance and permanence properties in which a dimethyl silicone rubber is formulated (see JP-A-229810/1986) have been proposed. But they cause a large physical resistance against combing and a feeling of sticking. Moreover, it is very difficult to emulsify a silicone rubber because it is insoluble in water and ethanol and only slightly soluble in oily ingredients such as liquid paraffin etc. EP-A-285 364 of Shiseido Company Limited, which was published on 5 October 1988 and is therefore in Article 54(3) relationship with the present application, discloses hair cosmetic compositions containing high molecular weight dimethylpolysiloxanes with nonionic surfactant and water-soluble polyhydric alcohol. Example 3 in this document is an emulsified hair setting agent which contains glycerine with polyethylene glycol (120) hardened castor oil ester as surfactant. The problem addressed herein is to provide a novel emulsified cosmetic for hair, enabling easy combing and a feeling or smoothness to hair, and protecting hair against heat and brushing. According to the present invention, there is provided an emulsified hair cosmetic which comprises (i) a dimethylsilicone rubber of the formula: wherein R¹ and R² are methyl or hydroxy; and n is an integer of 4000 to 9000; (ii) one or more polyalcohols selected from propylene glycol, 1,3-butylene glycol and glycerin; and (iii) one or more nonionic surfactants selected from polyoxyethylene oleyl ether, polyoxyethylene cetyl ether, ethylene glycol stearate, diethylene glycol stearate, polyethylene glycol stearate, polyethylene glycol distearate and glyceryl stearate, the proportion by weight of the total amount of (iii) to that of (i) being not more than 4:1, and the weight proportion of (iii) to (ii) being in the range from 1:2 to 2:1. Emulsified hair cosmetics as described can provide excellent easy combing and smooth feeling to hair and protect hair against heat and brushing. The dimethyl silicone rubber used in the emulsified hair cosmetic of the present invention is represented by the following formula [I]: wherein R¹ and R² are methyl or hydroxy, and n is an integer of from 4000 to 9000. Representative examples of dimethyl silicone rubber of the formula [I] include Toshiba Silicone TSE-200 and TSE-200A manufactured by Toshiba Silicone Co., Ltd., Japan and the like, and one or more of them can be formulated in the emulsified hair cosmetic of the present invention in an amount of 0.01 to 10% by weight, preferably 0.5 to 2.0% by weight based on the total weight of the cosmetic. When the amount is less than 0.01% by weight, the effect for providing easy combing and a feeling of smoothness to hair becomes insufficient and, when the amount is more than 10% by weight, viscosity of the dimethyl silicone rubber itself increases and it becomes difficult to emulsify. Further, one or more of the above surfactant (iii) as nonionic surfactant can be formulated in the emulsified hair cosmetic of the present invention. The total amount of such surfactant is not 4-fold more than the amount of the silicone rubber of (i) and 0.5-fold more than the amount of the polyalcohol of (ii) and not 2-fold more than that. When the total amount of (iii) is 4-fold more than the amount of silicone rubber, the emulsification is stabilized but usability of the emulsion is adversely effected. Further, when the total amount of nonionic surfactant of (iii) is out of the range of 0.5-fold to 2-fold amount of polyalcohol of (ii), the emulsion becomes unstable (the emulsion becomes liable to separate with dry). Furthermore, oily ingredients (e.g., cyclic silicone, triglyceride, ester oil, wax, etc.), coloring agents, perfumery, pH adjustors (e.g., phosphoric acid, citric acid, etc.), humectants (e.g., pyrrolidone carboxylate, lactic acid, etc.), solvent (e.g., water, ethanol), antistatic agents (e.g., cationic surfactant) may be formulated in the emulsified hair cosmetic of the present invention so far as they do not deteriorate the properties of the composition. Emulsified hair cosmetics embodying the invention may be in the form of e.g. milky lotion, a blow-wave preparation, or a hair treatment preparation, and may be produced by a known method. For example, the polyalcohol is mixed with the nonionic surfactant, if necessary, with heating. Then, a small amount of water (e.g., the same amount as of surfactant) is added to the resulting mixture. Separately, the dimethylsilicone rubber is dissolved in a suitable solvent (e.g., silicone oil having a low viscosity, ester oils, hydrocarbons). The resulting solution is slowly added with stirring to the above mixture. After completion of the addition, the remaining water is added. The hair cosmetic of the present invention may be used in the same manner as a conventional hair cosmetic. The following Examples and Comparative Examples further illustrate the invention in detail. All the %'s in Examples and Comparative Examples are by weight. Examples 1 to 6 and Comparative Examples 1 to 7 Each milky lotion-like hair cosmetic was prepared by mixing the ingredients described in Table 1 and thereafter stirring according to a conventional method. The following items were evaluated by the use of these hair cosmetics. The results are also shown in Table 1. Evaluation Evaluation of a test sample was carried out according to the following method. (1) Sticking immediately after application Sticking immediately after application was evaluated by an organoleptic test of practical use involving five professional panelists (females in their twenties). (2) Resistance to combing after drying Human hair (2g) treated with each test treating composition and dried was attached to a rheometer (Fudo Kogyo Co., Ltd., Japan). Maximum drag applied to the rheometer upon combing was measured and resistance to combing was calculated from the following formula: (3) Number of hairs cut The number of hairs cut after 7200 times of combing (a bundle of hair weighing about 2g: 119 non-treated hairs) (4) Stability After being allowed to stand at 40°C for one month, separation (or creaming) was evaluated according to the following criteria. O: Stable x: Creaming or separation (5) Overall evaluation O: no sticking, easy combing and stable x: Sticking, bad combing or unstable Example 7 (a blow-wave preparation) Ingredient A Amount (%) 1) Propylene glycol 0.8 2) Polyoxyethylene oleyl ether (5 EO) 0.5 3) Polyoxyethylene stearate (2 EO) 0.2 4) Dimethyl silicone rubber (TSE 200A) 0.8 5) Polyoxyethylene lauryl ether sulfuric acid sodium salt 0.1 6) Hexamethylcyclotrisiloxane 8.0 Ingredient B Amount (%) 7) Water remainder Ingredient C Amount (%) 8) 95% Ethanol 20 Ingredient D Amount (%) 9) Perfume 0.1 To the ingredients 1) to 3), 5) and a part of 7) (about 0.8%) were mixed. The ingredient 4) was dissolved in the ingredient 6) and the solution and the ingredient 9) were slowly added with stirring to the above mixture. Then, the remainder of 7) was added to prepare a blow-wave preparation. Example 8 (a milky lotion type) Ingredient A Amount (%) 1) 1,3-Butylene glycol 1.8 2) Polyoxyethylene cetyl ether (5 EO) 1.2 3) Methyl silicone rubber (TSE 200) 1.0 4) Decamethylcyclopentasiloxane 19.0 Ingredient B Amount (%) 5) Carbopol 941 0.3 6) Water remainder Ingredient C Amount (%) 7) Triethanolamine 0.3 8) Water 2.7 Ingredient D Amount (%) 9) Perfume 0.1 The ingredients 1), 2) and a part of 6) (1.0%) were mixed, if necessary with heating. The ingredient 3) was dissolved in the ingredient 4) and the solution and the ingredient 9) were slowly added with stirring to the above mixture. The ingredients 5) and 6) were mixed. The ingredients 7) and 8) were mixed. Both mixture of the ingredients 5) and 6) as well as 7) and 8) were added to the above mixture to prepare a milky hair lotion. Example 9 (a hair rinse) Ingredient A Amount (%) 1) Stearyltrimethylammonium chloride 2.0 2) Dimethyl silicone rubber (TSE200A) 2.0 3) Octamethylcyclotetrasiloxane 8.0 4) Self-emulsifiable glyceryl monostearate 1.0 5) Ethylene glycol monostearate 1.0 Ingredient B Amount (%) 6) Glycerin 2.0 7) Preservative trace 8) Coloring agent trace 9) Water remainder Ingredient C Amount (%) 10) Perfume 0.1 The ingredients 1), 4) to 8) and a part of 9) (2.0%) were mixed with warming. The ingredient 2) was dissolved in 3) and the solution and the ingredient 10) were slowly added with stirring to the resulting mixture. The reminder of the ingredient 9) was added to the mixture to prepare a hair rinse.

Claims: Claims for the following Contracting States : AT, BE, CH, DE, FR, GB, GR, IT, LI, LU, NL, SE An emulsified hair cosmetic which comprises (i) a dimethylsilicone rubber of the formula: wherein R¹ and R² are methyl or hydroxyl; and n is an integer of from 4000 to 9000; (ii) one or more polyalcohols selected from propylene glycol, 1,3-butylene glycol and glycerin; and (iii) one or more nonionic surfactants selected from polyoxyethylene oleyl ether, polyoxyethylene cetyl ether, ethylene glycol stearate, diethylene glycol stearate, polyethylene glycol stearate, polyethylene glycol distearate and glyceryl stearate, the proportion by weight of (iii):(i) being not more than 4:1, and the proportion by weight of (iii):(ii) being in the range from 1:2 to 2:1. An emulsified hair cosmetic according to claim 1 wherein the amount of the ingredient (i) is 0.01 to 10% by weight. An emulsified hair cosmetic according to claim 2, wherein the ingredient (i) constitutes from 0.5% to 2% by weight of the total cosmetic. A method of treating hair to improve the hair cosmetically, the method comprising applying an emulsified cosmetic according to any one of claims 1 to 3 to the hair. Claims for the following Contracting State : ES A method of making an emulsified hair cosmetic which comprises mixing: (i) a dimethylsilicone rubber of the formula: wherein R¹ and R² are methyl or hydroxyl; and n is an integer of from 4000 to 9000; (ii) one or more polyalcohols selected from propylene glycol, 1,3-butylene glycol and glycerin; and (iii) one or more nonionic surfactants selected from polyoxyethylene oleyl ether, polyoxyethylene cetyl ether, ethylene glycol stearate, diethylene glycol stearate, polyethylene glycol stearate, polyethylene glycol distearate and glyceryl stearate, the proportion by weight of (iii):(i) being not more than 4:1, and the proportion by weight of (iii):(ii) being in the range from 1:2 to 2:1. A method according to claim 1 wherein the amount of the ingredient (i) is 0.01 to 10% by weight. A method according to claim 2, wherein the ingredient (i) constitutes from 0.5% to 2% by weight of the total cosmetic. A method of treating hair to improve the hair cosmetically, the method comprising applying to the hair an emulsified cosmetic which comprises (i) a dimethylsilicone rubber of the formula: wherein R¹ and R² are methyl or hydroxyl; and n is an integer of from 4000 to 9000; (ii) one or more polyalcohols selected from propylene glycol, 1,3-butylene glycol and glycerin; and (iii) one or more nonionic surfactants selected from polyoxyethylene oleyl ether, polyoxyethylene cetyl ether, ethylene glycol stearate, diethylene glycol stearate, polyethylene glycol stearate, polyethylene glycol distearate and glyceryl stearate, the proportion by weight of (iii):(i) being not more than 4:1, and the proportion by weight of (iii):(ii) being in the range from 1:2 to 2:1.

Inventors: AWAMURA, MASAKI, NANJO, MASASHI, YAMAMOTO, KAZUSHI
Applicants: SUNSTAR KABUSHIKI KAISHA
Application year: 1988
Main classification: A61K7
IPC codes: C08L83, A61Q5, A61K8