Drug – bio-affecting and body treating compositions – Live hair or scalp treating compositions
Reexamination Certificate
2002-05-29
2004-02-17
Venkat, Jyothsna (Department: 1615)
Drug, bio-affecting and body treating compositions
Live hair or scalp treating compositions
C424S070100, C424S401000
Reexamination Certificate
active
06692729
ABSTRACT:
The present invention relates to a cosmetic resin composition consisting essentially of amphoteric urethane resin and a cosmetic using such a resin composition, and particularly, to a cosmetic resin composition used for a skin care product a hair care product and the like as a hair fixative, a film forming agent, a conditioning agent, a viscosity controlling agent and the like, and a cosmetic using the same.
Conventionally, a cationic acrylic resin, an anionic acrylic resin, an amphoteric or an ionic/cationic acrylic resin, a nonionic polyvinyl pyrrolidone resin and the like are used as a base resin of a hair fixative. When such a resin is used as a base resin, hair is set stiff, resulting in a good setting property (stiffness), but feel and combability are inferior and also flaking may occur. On the other hand, when feel and combability come first, not only setting property becomes insufficient, but also problems such as stickiness and the like may occur. Thus, it is difficult for the conventional base resin to satisfy all properties required for a hair fixative, such as stiffness, feel, combability and anti-flaking property.
Then, an application of an anionic urethane resin as a base resin for a hair fixative is proposed as seen in Japanese Provisional Publication TOKKAIHEI 6-321741. When such an anionic urethane resin is used, a hair fixative having good stiffness, feel and anti-flaking property, which are inconsistent to each other, can be prepared. In this viewpoint, a hair fixative using such an anionic urethane resin is superior to a hair fixative using the above mentioned acrylic resin. However, when the anionic urethane resin is used, a problem of inferior shampoo removability may be caused.
Accordingly, it is an object of the present invention to provide a cosmetic resin composition for preparation of a hair fixative having all the properties of stiffness, shampoo removability, feel, gloss, combability and anti-flaking property and to provide a cosmetic using such a cosmetic resin composition.
In accordance with a first aspect of the present invention to achieve the object described above, there is provided a cosmetic resin composition consisting essentially of an amphoteric urethane resin having a carboxyl group and a tertiary amino group in one molecule thereof, the amphoteric urethane resin having polysiloxane linkage in its structure. In accordance with a second aspect of the present invention, there is provided cosmetics using the cosmetic resin composition.
The inventors of the present invention found that a hair fixative having stiffness, feel, combability, anti-flaking property and the like can be obtained by using an amphoteric urethane resin having a carboxyl group and a tertiary amino group in one molecule thereof as a base resin and filed a patent application about a resin composition consisting essentially of the amphoteric urethane resin Japanese Patent Application No. TOKUGANHEI 10-27595). Improvement in each property when using the amphoteric resin is due to the following reason. That is, using the urethane resin as a main skeleton of a base resin makes it possible that stiffness is compatible with feel, combability and anti-flaking property, which are originally contrary to each other, due to elasticity and toughness of the urethane resin. Further, by using the amphoteric urethane resin having a carboxyl group and a tertiary amino group, it becomes possible to prepare a hair fixative superior in waterproof against neutral water because the carboxyl group and the tertiary amino group are ion-bonded, and also superior in shampoo removability because the ion-bond is cut by shampoo. In addition, since the amphoteric urethane resin has a cationic tertiary amino group, which interacts with a negatively charged hair surface, in its molecular chains, better adhesion can be obtained compared with a conventional anionic urethane resin.
Thus, in the case where the amphoteric urethane resin is used as a base resin, shampoo removability can be improved compared with the case where the conventional anionic urethane resin is used. However, to obtain sufficient shampoo removability, there are compositional restrictions, to some degree, such as adjustment of molecular weight of the amphoteric urethane resin, choice of urethane skeleton or the like, which may be a defect of low degree of freedom in designing physical properties, such as hardness, flexibility or the like, important for polymer to be used for a hair fixative. Then, the inventors further made researches about the resin composition consisting essentially of the amphoteric urethane resin. As a result, it was found that further improvement in shampoo removability can be obtained by the amphoteric urethane resin even with a higher molecular weight or a low glass transition temperature by introducing a structural unit derived from an ethylene oxide in the structure of the amphoteric urethane resin as nonionic hydrophilic component, and hardness and elasticity of the base resin which contribute to feel or stiffness required for a hair fixative, can be widely controlled. Thus, the inventors have attained the present invention.
The present invention will hereinafter be described by way of embodiments thereof.
The cosmetic resin composition of the present invention consists essentially of an amphoteric resin having a carboxyl group and a tertiary amino group in one molecule thereof. The most characteristic point of the present invention is that the amphoteric urethane resin has a structural unit derived from an ethylene oxide in its structure. In addition, the phrase “consisting essentially of an amphoteric urethane resin” means generally preparation of the cosmetic resin composition of interest by adding other components into the amphoteric urethane resin, however, includes the case where the cosmetic resin composition consists only of the amphoteric urethane resin.
The above-mentioned amphoteric urethane resin having a structural unit derived from an ethylene oxide may be obtained, for example, by reacting a polyol compound [component (A)], a polyisocyanate compound [component (B)], a polyethylene oxide derivative [component (C)] having an active hydrogen and a compound [component (D)] having an active hydrogen and a carboxyl group with each other in excess of isocyanate groups so as to produce a prepolymer containing an isocyanate group and reacting the prepolymer with a compound [component (E)] having an active hydrogen and a tertiary amino group. Alternatively, the amphoteric urethane resin having a structural unit derived from an ethylene oxide may be obtained by changing the reaction order of the component (D) for the component (E) in excess of isocyanate groups so as to produce a prepolymer containing an isocyanate group and reacting the prepolymer with the component (D). The amphoteric urethane resin of interest can be produced more easily and more safely by such methods than the conventional method. In addition, if both the component (D) and the component (E) are simultaneously reacted together with the components (A) to (C) In the above methods, a carboxyl group of the component (D) and a tertiary amino group of the component (E) initially form a salt which becomes insoluble to the reaction system and a reaction with the isocyanate compound may not occur even in the presence of an OH group. As a result, the amphoteric urethane resin of interest cannot be produced. That is, as above mentioned, the amphoteric urethane resin having a structural unit derived from an ethylene oxide can be produced by firstly reacting one of the component (D) and the component (E) together with the components (A) to (C) and then reacting the other component (D) or (E).
The polyol compound of the component (A) is not specifically limited, but any of the polyol compounds generally used for producing polyurethane. Examples of the polyol compound include polyester polyol, polyether polyol, polycarbonate polyol, polybutadiene polyol, polyisoprene polyol, polyolefin polyol, polyac
Asaoka Seiji
Hashimoto Tomohiro
Koyama Katsuya
Sakurai Takahiro
Tsuzuki Toshitaka
Kaiser Karen G.
National Startch and Chemical Investment Holding Corporation
Venkat Jyothsna
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