Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2002-06-05
2004-07-06
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S400000, C510S130000, C514S937000, C514S938000
Reexamination Certificate
active
06759052
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cosmetic composition having light feel at the actual use and stability. More in detail, the present invention relates to an oily cosmetic composition which has good dispersing ability of powder in a case when powder is contained, light feel at the actual use, and has excellent stability, further has good fluidity in the case of liquid cosmetic composition. Furthermore, the present invention relates to a W/O type emulsified cosmetic composition which has good stability for preservation, good fluidity, good extending and spreading feature at the actual use and has light feel.
2. Description of the Prior Art
An oily composition is the formulation type which is broadly used in cosmetic use or pharmaceutical use, because it has excellent resistance to sweat and to water. Especially, in the case of makeup cosmetic, it is useful as the formation type which has good effect such as long lasting ability of makeup. Up to the present, for the purpose to improve the stability of the oily makeup cosmetic, especially to improve the dispersion stability of pigment (powder), the methods to blend solid oil or semi-solid oil by high concentration or to blend a gelling agent were carried out. Consequently, almost all of oily makeup cosmetics are a solid type. Further, silicone oil is frequently used to a cosmetic composition because of it's light feel and excellent water resistance, and expected to be a base oil of the oily makeup cosmetic compositions.
However, since above mentioned conventional oily makeup cosmetic composition contains solid oil, semi-solid oil or gelling agent to improve the dispersion stability of pigment in components, there are fusing and filling up process and cooling and solidifying process in the preparing process, and the form of product is mainly a solid type such as stick type. Further, since it contains solid oil or semi-solid oil, feeling such as extending or spreading is not so smooth. And, the blending of solid oil, semi-solid oil or gelling agent is effective when oil is hydrocarbon oil, ester oil or glyceride oil, however, when in the case which large quantity of silicone oil is contained, remarkable effect can not be expected.
Further, the W/O type emulsion is a formation type which is broadly used in cosmetic use or pharmaceutical use, because it has excellent resistance to sweat and to water, especially in the field of cosmetic composition it is noticed that it is the formation type which has an excellent effect such as long lasting ability of makeup. For the purpose to improve the stability of the W/O type emulsified cosmetic composition, a lot of countermeasures were took up to the present. For example, a method to provide a thixotropic feature to the outer phase oil, a method to blend solid oil or semi-solid oil to the outer phase oil by high concentration, a method to blend an electrolyte substance to the inner phase water, a method to gel the inner water, a method to raise the ratio of inner water or the method to increase the blending amount of the surface active agent can be mentioned.
Among the above mentioned method to improve the stability of the W/O type emulsified cosmetic composition, the method to provide a thixotropic feature to the outer phase oil is the most popular measure. Concretely, it is the method to blend an oil gelling agent such as organic modified clay mineral, sucrose carboxylic acid ester or dextrin carboxylic acid ester. For example, in JP Laid Open Publication 8-277302, there is a disclosure that the dextrin ester of normal chain fatty acid, branched fatty acid and/or unsaturated fatty acid is effective in providing high thixotropy as a gelling agent.
Silicone oil is broadly used to the cosmetic composition because of it's specific light feel and good water resistance. Especially, cyclic silicone oil such as octamethylcyclotetrasiloxane has light feel and volatile feature, it is expected to be used as an outer phase oil of W/O type emulsified cosmetic composition for the purpose to perform light feel on skin. However, the technique to improve the 'stability of said W/O type emulsified cosmetic composition is effective in the case when the outer phase oil is hydrocarbon oil, ester oil or glyceride oil, while, in the case when the outer phase oil contains high amount of cyclic silicone oil, remarkable effect can not be obtained.
The present invention is carried out concerning above mentioned circumstances, and the object of the present invention is to provide an oily cosmetic composition which is excellent in stability, further is excellent in fluidity in the case of liquid cosmetic composition and good dispersing ability of powder. Further, another object of the present invention is to provide an improved W/O type emulsified cosmetic composition containing higher amount of cyclic silicone oil in the outer phase oil, that is, stability of which is improved maintaining light feel, which is an original feature of cyclic silicone oil, further has an excellent fluidity and good dispersing ability of powder.
BRIEF SUMMARY OF THE INVENTION
The present invention is carried out based on the knowledge that carboxylic acid ester of inulin and/or hydrolyzed inulin whose degree of substitution by acyl group is larger than 1 are suited as the component to enhance the viscosity of cyclic silicone oil, namely as the gelling agent, and by blending these components in combination to cosmetic composition, the stability of the cosmetic composition can be improved.
That is, the present invention is the cosmetic compound containing (A) inulin carboxylic acid ester whose degree of substitution by acyl group is larger than 1 and/or hydrolyzed inulin carboxylic acid ester whose degree of substitution by acyl group is larger than 1 (shortened: carboxylic acid ester of inulin and/or hydrolyzed inulin whose degree of substitution by acyl group is larger than 1) and (B) cyclic silicone oil. Further, the present invention is the oily cosmetic composition, wherein said cosmetic composition further containing an oleophilic component. Furthermore, the present invention is a W/O type emulsified cosmetic composition, wherein said cosmetic composition further containing an aqueous component and an emulsifier.
As the desirable example of carboxylic acid which composes component (A), carboxylic acid of carbon number 14 to 22 can be mentioned. Further, a part or all of carboxylic acid of (A) is desirable to be palmitoyl group and/or stearoyl group. Furthermore, dextrin carboxylic acid ester whose degree of substitution by acyl group is 1.5 to 2.5 can be blended to above mentioned cosmetic composition. As the cyclic silicone oil of component (B), it is desirable to use at least one cyclic silicone oil selected from the group consisting of octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane.
Further, the present invention is the oily makeup cosmetic composition containing (A-1) 5-20 wt. % of a gelling agent containing more than 50 wt. % of (a) carboxylic acid ester of inulin and/or hydrolyzed inulin whose degree of substitution by acyl group is larger than 1 and (b) dextrin carboxylic acid ester whose degree of substitution by acyl group is 1.5 to 2.5 to the total weight of (A-1), (B) 30-90 wt. % of at least one cyclic silicone oil selected from the group consisting of octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane and (C) 0.1-40 wt. % of powder. Said component (A-1) is desirable to be a gelling agent containing more than 50 wt. % of (a) carboxylic acid ester of inulin and/or hydrolyzed inulin whose degree of substitution by acyl group is larger than 1 and (b) dextrin carboxylic acid ester whose degree of substitution by acyl group is 1.5 to 1.7 to the total weight of (A-1), wherein the blending ratio of (a) and (b) is (b)/(a)=0.5-2.
Furthermore, the present invention is a W/O type emulsified cosmetic composition containing (A-1) 1-20 wt. % of a gelling agent containing more
Inagawa Kei
Miyagawa Satsuki
Naito Noboru
Suzuki Kazuhiro
Watanabe Soichiro
Dodson Shelley A.
Kose Corporation
Sherman & Shalloway
LandOfFree
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