RESIN COMPOSITION FOR COSMETICS

Abstract: The present invention provides cosmetic resin compositions which have both of sufficient adhesive properties to hair and washability without spoiling any other characteristics required for hairstylings regarding the setting ability, feeling, combability, and anti-flaking property. The cosmetic resin composition of the present invention is characterized in that it comprises as a major ingredient an amphoteric urethane resin having one or more carboxyl groups and one or more tertiary amino groups in a single molecule.

Description: RESIN COMPOSITION FOR COSMETICS The present invention relates to aqueous cosmetic resin compositions which comprise as a major ingredient an amphoteric urethane resin and in particular to those compositions for use in skin-care or hair-care products as hairstyling compositions, conditioning agents, or viscosity-regulating agents Coventionally, base resins such as anionic acrylic resins, anionic/cationic amphoteric acrylic resins, or nonionic polyvinylpyrrolidone resins are used in hairstylings Such base resins, however, have drawbacks that they have poor feeling and combability, and also result in flaking, although they exhibit an excellent setting ability for fixedly styling the hair On the other hand, when the feeling and combability are put above other properties, different problems such as a poor setting ability will rise It is thus difficult to have all the characteristics required for hairstylings regarding the setting ability, feeling, combability and anti-flaking property, when the conventional resins as described above are used In order to solve the problems above, use of anionic urethane resins instead of the acrylic or other resins above has been proposed (Japanese Patent Publication (Kokai) No H6 (1994)-321741 ) When used as a base resin for a hairstyling, such a urethane resin allows the hairstyling to have conflicting properties such as a good setting ability, good feeling, good combability, and good anti-flaking property Such an anionic urethane resin, however, cannot be washed away satisfactorily with a shampoo or the like, and thus have a drawback in its poor washability In light of such circumstances, the present invention aims to provide a cosmetic resin composition which has both of a sufficient adhesive property to the hair and a sufficient washability without adversely affecting properties required for the hairstyling regarding the setting ability, feeling, combability, and anti-flaking property In order to achieve the above aim, the cosmetic resin composition of the present invention comprises as a major ingredient an amphoteric urethane resin having one or more carboxyl groups and one or more tertiary groups in a single molecule The present inventors have concentrated their efforts in research for base resins which have all the properties required for the hairstylings regarding the setting ability, the feeling, combing property, anti-flaking property, adhesive property to the hair, and washability As a consequence, the present inventors have finally found that such an aim can be achieved by the use of a resin composition which comprises as a major ingredient the amphoteric urethane resin having both carboxyl groups and tentary ammo groups in a single molecule The present invention has been thus completed on the basis of this finding Specifically, when a urethane resin is used as a main structure of the base resin, the desirable setting ability can be attained because of elasticity and toughness of the urethane resin, simultaneously with the feeling, combability, and anti-flaking property which are all intrinsically conflicting with the setting ability We have found, however, that such a urethane resin cannot be easily washed away from the hair when used in the hairstyling, because the molecular chains of the urethane resin are prone to intertangle with each other and thereby the form films, and that when the washability is preferential, the elasticity and toughness of the urethane resin are impaired After our further intensive efforts to solve such problems, we have found that by using the amphoteric urethane resins having both of carboxyl groups and tertiary ammo groups, it becomes possible to produce a hairstyling which is highly water-resistant in neutral water because of ionic bonds between the carboxyl groups and tertiary ammo groups, and which also exhibits excellent washability because of the cleavage of such ionic bonds when washed with shampoos or the like Furthermore, the amophoteπc urethane resin above has a better adhesive property compared to the conventional anionic urethane resin, since the cationic tertiary ammo groups contained in the molecular chain interact with the negatively charged surface of the hair In addition, a particularly good washability can be achieved by adjusting a ratio of the carboxyl groups to the tertiary ammo groups (a ratio between the numbers of respective functional groups) in the amphoteric urethane resin within a certain range Embodiments for carrying out the present invention are described below The cosmetic resin composition of the present invention comprises as a major ingredient the amphoteric urethane resin having the carboxyl groups and tertiary ammo groups in a single molecule Such a cosmetic resin composition is used in skin-care or hair-care products as a hairstyling agent, conditioning agent, or viscosity-regulating agent, and preferably as a hairstyling agent A composition "comprising as a major ingredient the amphoteric urethane resin" generally intends to mean that the composition also contains other ιngredιent(s) in addition to the resin, but the phrase is also intended to include a composition which consists of only the amphoteric urethane resin The amphoteric urethane resin as describe above may be prepared, for example, by reacting a polyol compound (Component A), a polyisocyanate compound (Component B), and a compound having one or more active hydrogens and one or more carboxyl groups (Component C) under the excessive presence of isocyanate groups to prepare a prepolymer containing the isocyanate groups, and then reacting the prepolymer containing the isocyanate groups with a compound having one or more active hydrogens and one or more tertiary ammo groups (Component D) Alternatively, the reaction sequence of Components C and D may be exchanged, that is the amphoteric urethane resin as described above may also be prepared by reacting Components A, B and D under the excessive presence of isocyanate groups to prepare a prepolymer containing the isocyanate groups, and then reacting the prepolymer containing the isocyanate groups with particular Component C According to such processes, the amphoteric urethane resin can be produced more easily and more safely compared to the conventional processes. In the processes above, an intended amphoteric urethane resin cannot be obtained when Component C and Component D are simulataneously reacted with Components A and B, because in such a procedure, the carboxyl groups in Component C firstly form salts with the tertiary ammo groups in Component D to become insoluble in the reaction system, and thereby precluding their reactions with the isocyanate compound in spite of the presence of OH groups Thus, the desired amphoteric urethane resin can be produced as described above by reacting Components A and B with one of Components C and D, and thereafter reacting with the other component The polyol compound used as Component A above is not specifically restricted so far as it is generally used in the production of the general polyurethane, and includes, for example, polyester polyols, polyether polyols, polycarbonate polyols, polybutadiene polyols, polyisoprene polyols, polyolefin polyols, and polyacrylate polyols Such polyol compounds are used alone or in combination with one or more other such compounds Among them, the polyester polyols and polyether polyols are particularly preferred Examples of such a polyester polyol are those obtained by polycondensation of at least one of dicarboxylic acids such as succmic acid, glutaπc acid, adipic acid, sebacic acid, azelaic acid, maleic acid, fumaπc acid, phthahc acid, and terephthahc acid with at least one of polyols such as ethylene glycol, propylene glycol, 1 ,4-butanedιol, 1 ,3-butanedιol, 1 ,6-hexanedιol, neopentyl glycol, 1 ,8-octanedιol, 1 ,10-decanedιol, diethylene glycol, spiroglycol, and tπmethylolpropane, as well as those obtained by ring-opening polymerization of lactones Examples of such a polyether polyol which may be used are those obtained by ring-opening addition polymerization of cyclic ethers such as ethylene oxide, propylene oxide, oxetane, and tetrahydrofuran with water or polyols used in synthesis of said polyester polyols, or with phenols such as bisphenol A, or primary or secondary amines Specific examples of such polyether polyol are polyoxyethylene polyols, polyoxypropylene polyols, polyoxytetramethylene polyols, those obtained by ring- opening addition polymerization of at least one of propylene oxide and ethylene oxide with bisphenol A (in the case of a copolymer, it may be a block or a random copolymer) The polyisocyanate compound used as Component B above is not specifically restricted, and includes, for example, organic diisocyanate compounds such as aliphatic diisocyanate, ahcyclic diisocyanate, aromatic diisocyanate compounds Such polyisocyanate compounds are used alone or in combination with one or more other such compounds Examples of the aliphatic diisocyanate compound includes ethylene dnsocyante, 2,2,4-tπmethylhexamethylene dnsocyante, and hexamethylene-1 ,6- dusocyanate Examples of the ahcyclic diisocyanate compound includes hydrogenated dιphenylmethane-4,4'-dιιsocyanate, cyclohexane-1 ,4-dιιsocyante, methylcyclohexylene diisocyanate, isophorone diisocyanate and norbornane diisocyanate Examples of the aromatic diisocyanate includes dιphenylmethane-4,4'-dιιsocyanate, xylylene diisocyanate, toluene diisocyanate, and naphthalene diisocyanate Among these compounds, hexamethylene-1 ,6-dιιsocyanate, isophorone diisocyanate, and norbornane diisocyanate are preferred in view of their low costs The compound having one or more active hydrogens and one or more carboxyl groups, used as Component C, is not specifically restricted so far as it has at least one active hydrogen and at least one carboxyl group in the molecule, and includes, for example, dimethylolpropionic acid (DMPA), dimethylolbutanoic acid, and polycaprolactonediol containing carboxyl group(s) The compound having one or more active hydrogens and one or more tertiary ammo groups, used as Component D, is not specifically restricted so far as it has at least one active hydrogen and at least one tertiary ammo group in the molecule, and includes, for example, N-alkyldialkanolamme compounds such as N-methyldiethanolamine and N- butyldiethanolamme, as well as dimethylaminoethanol. In the preparation of the prepolymers containing the isocyanate groups by using the components above, it is preferred to use a chain-lengthening agent It becomes possible by using the chain-lengthening agent to regulate various properties of the amphoteric urethane resin obtained as a final product The chain-lengthening agent which may be used is not specifically restricted, and includes low molecular weight polyols, amines, and the like Examples of such a low molecular weight polyol are glycols such as ethylene glycol, propylene glycol, 1 ,4-butanedιol, diethylene glycol, 1 ,6-hexanedιol, spiroglycol, bιs(β-hydroxyethoxy)benzene, and xylylene glycol, as well as tπols such as tπmethylolpropane and glycerin An example of the amine used for that purpose is methylenebιs(o-chloranιlιne) It is preferred for all of the polyol compound (Component A), the polyisocyanate compound (Component B), the compound having one or more active hydrogens and one or more carboxyl groups (Component C), the compound having one or more active hydrogens and one or more tertiary ammo groups (Component D), and the chain- lengthening agent described above to be polyfunctional compounds having 3 or more different functions, since use of such polyfunctional compounds results in improvement of physical properties such as heat-resistance of the polyurethane-urea polymers by formation of cross-links In production of the amphoteric urethane resins, a solvent may be optionally used, and it is particularly preferred to use a solvent in which both of the raw materials and the formed polyurethane are soluble Examples of such a solvent are amides such as N- methylpyrrolidone, dimethylformamide, and dimethylacetamide, ketones such as acetone and methyl ethyl ketone, and esters such as ethyl acetate, as well as cellosolve acetates and cellosolve ethers In addition, a polymerization catalyst well known in the art of the polyurethanes such as tertiary amine catalyst are dιazabιcyclo[2 2 2]octane (DABCO), tetramethylenediamine, N-methylmorpholine, and diazabicycloundecene (DBU) An example of the organomettalic catalyst is dibutyltin dilaurate A preferred amphoteric urethane resin prepared from the components above has a ratio of the carboxyl groups to the tertiary ammo groups (a ratio between the numbers of respective functional groups) which has been set at carboxyl group/tertiary ammo group = 1/10 to 10/1 This is because the amphoteric urethane resins in which the ratio of the carboxyl groups to the tertiary ammo groups has been set in the range above has a good washability The amphoteric urethane resin described above is dispersed in water to obtain an aqueous dispersion or solubilized in water to obtain an aqueous solution for the use in a skin-care or a hair-care product as a hairstyling agent, conditioning agent, or viscosity- regulating agent In this case, it is preferred to disperse the amphoteric urethane resin in water containing an aliphatic polyamine This is because when the excessive isocyanate groups are used in the polymerization while keeping the polymerization degree low and the polymer is reacted with the aliphatic polyamine while being dispersed in water, the NH and/or NH2 groups of the aliphatic polyamine rapidly react with the isocyanate groups, which allows the polymerization to proceed in water while forming urea bonds Such an aliphatic polyamine is not specifically restricted, and includes, for example, tπethylamine, ethylenediamine, propylenediamine, piperazine, diethylenetπamine, and the like It is noted that a silane coupling agent may also be added as an additive to said aqueous dispersions of the amphoteric urethane resin so as to improve their adhesion to other substrate Furthermore, various other addιtιve(s) such as a protective colloid an antibacterial agent or an antifungal agent may also be added to improve the storage stability The aqueous dispersion or aqueous solution of the amphoteric urethane resin thus prepared is used as a hair gel composition in combination with, for example, a thickening agent, ethanol, and deionized water Alternatively, such an aqueous dispersion or aqueous solution of the amphoteric urethane resin is used as hair foam composition in combination with, for example, various surfactants such as polyoxyethylene alkyl ether and a palm-oil fatty acid diethanolamide, a propellant (LPG), dimethyl ether, ethanol, and other various additives (a silicon-based compound, an amme-based compound) The followmgs are descriptions of working examples and a comparative example Example 1 Into a four-necked glass flask attached with a stirrer, thermometer, and nitrogen inlet tube, 100 g of isophorone diisocyanate (IPDI), 225 g of polyoxytetramethylene glycol (PTMG, MW = 2000), and 18 g of dimethylolpropionic acid (DMPA) were introduced, and 30 g of ethyl acetate as organic solvent and 0 02 g of dibutyltin dilaurate as a catalyst were added thereto The mixture was then heated to 80°C using an oil bath, and the reaction was allowed to proceed for 4 hours while maintaining that temperature The temperature was then lowered to 70°C, and 8 g of N-methyldiethanolamine (NMDEA) and 30 g of ethyl acetate were further added The reaction was allowed to proceed for additional 2 hours to obtain a solution of a polyurethane prepolymer having remaining NCO groups This polyurethane prepolymer having the remaining NCO groups was dispersed in 600 g of water containing 12 g of tπethylamine, and chain-lengthening reaction was allowed to proceed at 50°C for 3 hours to convert the prepolymers to higher molecular weight polymers The ethyl acetate was recovered from the resultant aqueous dispersion to obtain an aqueous dispersion of the amphoteric urethane resin which substantially contained no organic solvent Example 2 An aqueous dispersion of an amphoteric urethane resin was obtained as described in Example 1 except that the amount of the N-methyldiethanolamine (NMDEA) was changed to 4 g Example 3 An aqueous dispersion of an amphoteric urethane resin was obtained as described in Example 1 except that the amount of N-methyldiethanolamine (NMDEA) was changed to 13 g Comparative Example An aqueous dispersion of an anionic urethane resin was obtained as described in Example 1 except that N-methyldiethanolamine (NMDEA) was not used The aqueous dispersions thus obtained in Examples 1-3 and Comparative Example were used at blending ratios described below in the preparation of Hair Gel Compositions "a" - "d" Hair Gel Composition "a" To obtain component X, the ingredients shown below in Table 1 were blended with each other at the ratio indicated therein, and mixed until a viscous gel was obtained The component Y which was obtained by mixing the ingredients shown in Table 1 at the ratio indicated therein was then added to the component X above, and gently mixed to homogeneity so as to obtain Hair Gel Composition "a" Table 1 * 1 Structure 2001 (National Starch and Chemical Company) Hair Gel Compositions "b" and "c" Hair Gel Compositions "b" and "c" were prepared according to the procedure described above for Hair Gel Composition "a", except that the aqueous dispersions of Examples 2 and 3 were each used in Component Y shown above in Table 1 instead of the aqueous dispersion of Example 1 Hair Gel Composition of "d" Hair Gel Composition "d" was prepared according to the procedure described above for Hair Gel Composition "a", except that the water dispersion of Comparative Example was used in Component Y shown above in Table 1 instead of the water dispersion of Example 1 Hair Gel Compositions "a" - "d" thus obtained were used to evaluate their washability according to criteria described below The results are shown in Table 2 Washability Each Hair Gel Composition was applied on a glass plate to form a film 40 μm thick, and the film was then washed with a commercially available shampoo solution The washability thus evaluated is indicated according to the following criteria ®, the film could be washed away quite easily, θ, the film could be washed away easily, x, the film could not be washed away sufficiently Table 2 It is apparent from the results shown in Table 2 that all Hair Gel Compositions "a" - "c" employing the amphoteric urethane resins of Examples 1-3, respectively, have excellent washability, and that Hair Gel Composition "a" which employed the amphoteric urethane resin of Example 1 has particularly good washability This is probably because the ionic bonds between the carboxy group and the tertiary ammo group in the amphoteric urethane resin are cleaved with the shampoo solution On the contrary, Hair Gel Composition "d" which employed the anionic urethane resin of Comparative Example had quite poor washability, and thus was unsuitable for use as the hairstyling The feeling, setting ability, combability, anit-flaking property, and antistatic property were then evaluated using Hair Gel Compositions "a" - "d" according to the criteria described below The results are shown below in Table 3 Specifically, 1 0 g of each Hair Gel Composition was separately applied to a bundle of black virgin hair (length 15 cm, weight 3 0 g), and evaluated for the properties above after drying Feeling A hairstyling which resulted in the hair having excellent feeling or touch after drying is indicated by Θ Setting Ability A hairstyling which had an excellent setting ability without resulting in the tousled hair after drying is indicated by Θ Combability A hairstyling which resulted in the hair being easily combed after drying is indicated by Θ Anti-flaking property A hairstyling which resulted in the hair having no bloom on it at all after combing 10 times at dryness is indicated by ®, while a hairstyling which resulted in the hair having only slight bloom is indicated by ® Antistatic property A hairstyling which generated no static electricity at all after combing 10 times at dryness in indicated by ®, while a hairstyling which generated only slight static electricity is indicated by θ Table 3 As apparent from the results shown in Table 3, Hair Gel Compositions "a" - "c" which employed the amphoteric urethane resins of Examples 1-3, respectively, gave similar or even superior results for all the properties, compared to Hair Gel Composition "d" which employed the anionic urethane resin of Comparative Example In particular, it is shown that Hair Gel Compositions "a" - "c" have excellent anti-flaking and anti-static properties In another experiment, Hair Foam Compositions "a" - "d" were preparedusmg the water dispersions of Examples 1 -3 and Comparative Example at the ratios indicated below. Hair Foam Composition "a" To obtain the Component X, the ingredients shown below in Table 4 were combined with each other at the ratio indicated therein, and mixed to homogeneity The Component Y shown in Table 4 was then added to the Component X to obtain Hair Foam Composition "a" Table 4 * 1 NIKKOL BS-20 (Nikko Chemicals Co ) *2 Amycol CDE-1 (Miyoshi Yushi Co ) Hair Foam Compositions "b" and "c" Hair Foam Compositions "b" and "c" were prepared according to the procedure described above for Hair Foam Composition "a", except that the aqueous dispersions of Examples 2 and 3 were each used in the Component X shown above in Table 4 instead of the aqueous dispersion of Example 1 Hair Foam Composition "d" Hair Foam Composition "d" was prepared according to the procedure described above for Hair Foam Composition "a", except that the aqueous dispersion of Comparative Example was used in the Component X shown above in Table 4 instead of the aqueous dispersion of Example 1 Hair Foam Compositions "a" - "d" thus obtained were used to evaluate their washability, feeling, setting ability, combability, anti-flaking property, and anti-static property, according to the criteria described above The results of such evaluations were nearly the same as those obtained for Hair Gel Compositions "a" - "d" Thus, all Hair Foam Compositions ' a" - "c" which employed the amphoteric urethane resins of Example 1-3, respectively, had good washability, and exhibited similar or even superior properties also in other evaluations, compared to Hair Foam Composition "d" which employed the anionic urethane resin of Comparative Example In addition to the hairstylings described above, the cosmetic resin compositions of the present invention may be used in, for example, conditioning shaving creams and skin- care lotions Conditioning shaving cream To obtain the Component X, the ingredients shown below in Table 5 were mixed at the ratio indicated therein, and heated to 80°C Separately, the Component Y was obtained by mixing the ingredients shown in Table 5 at the ratio indicated therein and heating the mixture to 80°C The Components X and Y thus obtained were then mixed at 80°C, and cooled to 40°C To the cooled mixture, appropriate amounts of an antiseptic agent and a perfume were added to obtain an intended conditioning shaving cream Table 5 Skin-care lotion To obtain the Component X, the ingredients shown below in Table 6 were mixed at the ratio indicated therein, and heated to 80°C Separately, the Component Y was obtained by mixing the ingredients shown in Table 6 at the ratio indicated therein and heating the mixture to 80°C The Components X and Y thus obtained were then mixed and stirred at 80°C for 30 minutes To the mixture, 20% by weight of 2% Carbopol 940 in water was then added, and stirred to homogeneity The mixture was then cooled to 40°C to obtain an intended skin-care lotion Table 6 Effects of the Invention As described above, the cosmetic resin composition of the present invention comprises as a major ingredient the amphoteric urethane resin having the carboxyl groups and tertiary ammo groups, and thereby have all the properties required for the hairstylings regarding the setting ability, feeling, combability, anti-flaking property, adhesive property to hair and washability Specifically, when a urethane resin is used as a mam structure of the base resin, the desirable setting ability can be attained because of the elasticity and toughness of the urethane resin, simultaneously with the feeling, combability, and the anti-flaking property which are all intrinsically conflicting with the setting ability By using the amphoteric urethane resins having both of carboxyl groups and tertiary ammo groups, it becomes possible to produce a hairstyling which is highly water-resistant in neutral water because of ionic bonds between the carboxyl groups and the tertiary ammo groups, and which also exhibits excellent washability because of the cleavage of such ionic bonds when washed with shampoos or the like Furthermore, the amphoteric urethane resin above has a better adhesive property compared to the conventional anionic urethane resin, since the cationic tertiary ammo groups contained in the molecular chain interact with the negatively charged surface of the hair In addition, a particularly good washability can be achieved by adjusting a ratio of the carboxyl groups to the tertiary ammo groups (a ratio between the numbers of respective functional groups) in the amphoteric urethane resin within a certain range

Claims: What is claimed 1 A cosmetic resin composition characterized in that it comprises as a major ingredient an amphoteric urethane resin having one or more carboxyl groups and one or more tertiary am o groups in a single molecule 2 The cosmetic resin composition according to Claim 1 , which is a hair care composition 3 The cosmetic resin composition according to Claim 1 or 2, in which a ratio of the carboxyl groups to the tertiary ammo groups (a ratio between the numbers of respective functional groups) in said amphoteric urethane resin is carboxyl groups/tertiary groups = 1/10 to 10/1 4 The cosmetic resin composition according to any one of Claims 1 to 3, in which said amphoteric urethane resin is obtained by reacting the following Components (A) to (C) under the excessive presence of isocyanate groups to prepare a prepolymer containing the isocyanate groups, and then reacting said prepolymer containing the isocyanate groups with the following Component (D) (A) a polyol compound, (B) a polyisocyanate compound, (C) a compound having one or more active hydrogens and one or more carboxyl groups, (D) a compound having one or more active hydrogens and one or more tertiary ammo groups 5 The cosmetic resin composition according to any one of Claims 1 to 3, in which said amphoteric urethane resin is obtained by reacting the following Components (A), (B) and (D) under the excessive presence of isocyanate groups to prepare a prepolymer containing the isocyanate groups, and then reacting said prepolymer containing the isocyanate groups with the following Component (C) (A) a polyol compound, (B) a polyisocyanate compound, (C) a compound having one or more active hydrogens and one or more carboxyl groups, (D) a compound having one or more active hydrogens and one or more tertiary ammo groups 6 The cosmetic resin composition according to any one of Claims 1 to 5 in which said amphoteric urethane resin is dispersed or solubilized in water

Inventors: ASAOKA SEIJI, KOYAMA KATSUYA, SAKURAI TAKAHIRO, TSUZUKI TOSHITAKA, ASAOKA, SEIJI, KOYAMA, KATSUYA, SAKURAI, TAKAHIRO, TSUZUKI, TOSHITAKA
Applicants: ASAOKA SEIJI, KOYAMA KATSUYA, NAT STARCH CHEM INVEST, SAKURAI TAKAHIRO, TSUZUKI TOSHITAKA, ASAOKA, SEIJI, KOYAMA, KATSUYA, NATIONAL STARCH AND CHEMICAL INVESTMENT HOLDING CORPORATION, SAKURAI, TAKAHIRO, TSUZUKI, TOSHITAKA
Application year: 1999
Main classification: A61K7
IPC codes: A61K8, A61Q5, A61Q9, A61Q19