Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1997-05-12
1998-10-27
Glass, Margaret W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
424 59, 424 709, 424 7012, 424 7803, 524837, C08L 3102, C08L 8304
Patent
active
058279202
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an emulsion composition. More specifically, it relates to an emulsion compositions having little stickiness to the skin, a superior rich feeling of use, and a good emulsion stability.
BACKGROUND ART
As the emulsion compositions for cosmetics creams, emulsions, etc. using various types of oil-based and water-based components and surfactants have been widely used in the past. In recent years, however, greater safety has been desired in cosmetics as well. From this viewpoint, the presence of surfactants has been considered a problem. Therefore, it may be considered to formulate an emulsion composition for a cosmetic without using a surfactant. As such a method, there is the method of formulating the emulsion composition for the cosmetic using an alkyl-modified carboxyvinyl polymer, but this emulsion composition is deficient in that it does not have a sufficiently good feeling of use, in particular, lacks rich feeling when applied to the skin, and suffers from stickiness and sliminess after drying.
DISCLOSURE OF INVENTION
Accordingly, the object of the present invention is to provide an emulsion composition, even without using a surfactant, having little stickiness or sliminess, a good rich feeling of use, and a good emulsion stability.
In accordance with the present invention, there is provided an emulsion composition comprising (i) an alkyl-modified carboxyvinyl polymer, (ii) a C.sub.12 to C.sub.28 higher alcohol which is solid at room temperature and (iii) a silicone oil, wherein the weight ratio of the component (i)/component (ii) is not more than 0.5.
BEST MODE FOR CARRYING OUT THE INVENTION
The present inventors engaged in intensive research to solve the above-mentioned problem and, as a result, found that, by incorporating, into the emulsion composition, an alkyl-modified carboxyvinyl polymer, a solid higher alcohol, and a silicone oil, wherein the weight ratio of the component (i)/component (ii) is made 0.5 or less, it is possible to obtain a good rich feeling of use having little stickiness or sliminess, and a high emulsion stability, whereby the present invention has been completed.
The emulsion composition of the present invention is characterized in that it substantially does not contain any surfactant. Further, the content of the solid higher alcohol is preferably 0.01 to 10% by weight and the content of the silicone oil is preferably 1 to 30% by weight.
The constitution of the emulsion composition of the present invention will now be explained.
The alkyl-modified carboxyvinyl polymer (powder) usable as the component (i) in the emulsion composition of the present invention may include an acrylic acid-methacrylic acid alkyl copolymer, for example, those commercially available under the brand names of CARBOPOL 1342, PEMULEN TR-1, and PEMULEN TR-2 (BF Goodrich Company). These alkyl-modified carboxyvinyl polymers may be used alone or in any mixtures of two or more types. Further, the formulation amount is preferably 0.01 to 10% by weight based upon the total weight of the emulsion composition. Further, from the viewpoint of the feeling of use, a range of 0.05 to 5% by weight based upon the total weight of the emulsion composition is more preferable. If the formulation amount is less than 0.01% by weight, the emulsification is difficult, whereas the amount 10% by weight, no further increase in the emulsification action and effect of improvement of the emulsion stability can be expected. Note that with a non-alkyl-modified carboxyvinyl polymer (for example, CARBOPOL 941 (BF Goodrich Co.), Hybis Wako-105 (Wako Pure Chemicals) etc. ordinarily used as a thickener, it is not possible to stably emulsify the oil component.
The C.sub.12 to C.sub.28 (preferably C.sub.6 to C.sub.22) higher alcohol usable as the component (ii) in the emulsion composition of the present invention and solid at room temperature (for example, 15.degree. to 20.degree. C.) may be used alone or in any mixture thereof. As specific examples, straight chain alcohols such as lauryl
REFERENCES:
patent: 5306485 (1994-04-01), Robinson et al.
patent: 5322689 (1994-06-01), Hughes et al.
patent: 5567426 (1996-10-01), Nadaud et al.
patent: 5585104 (1996-12-01), Ha et al.
patent: 5641493 (1997-06-01), Date et al.
Ito Kenzo
Kakoki Hiroyuki
Watanabe Kei
Glass Margaret W.
Shiseido Company Ltd.
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