Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2002-02-19
2003-01-21
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S059000, C424S069000, C424S078020, C424S078030, C424S078080, C424S489000, C424S491000, C424S497000, C424S501000
Reexamination Certificate
active
06509025
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a cosmetic composition and, more particularly, to a method of preparing an impact resistant solid cosmetic composition. This method involves compression molding, into a dish mold, powder materials which contain spherical powders of organopolysiloxane elastomer.
BACKGROUND OF THE INVENTION
Conventionally, a spherical powder of an organopolysiloxane elastomer, having characteristic elasticity, has been developed as a powder for use in cosmetic compositions and has been incorporated into a variety of products. Such a powder exhibits favorable properties when incorporated into cosmetic compositions, i.e., the cosmetic composition containing such a powder exhibits good skin fittability and spreadability on the skin, imparts a light and smooth sensation when applied to the skin, has a soft-touch sensation, and does not irritate the skin (Japanese Patent Application Laid-Open (kokai) No. 2-243612 and Japanese Patent Publication (kokoku) Nos. 4-17162 and 4-66446).
However, when a spherical powder of organopolysiloxane elastomer is incorporated into a cosmetic composition in a large amount in order to fully realize favorable properties of the powder, the resultant solid cosmetic composition disadvantageously exhibits deteriorated strength against impact (hereinafter referred to as impact resistance).
SUMMARY OF THE INVENTION
In view of the foregoing, an object of the present invention is to provide a solid cosmetic composition having excellent strength against impact even when a spherical powder of organopolysiloxane elastomer is incorporated into the cosmetic composition in a large amount.
In order to overcome the drawbacks, the present inventors have conducted earnest studies on a spherical powder of organopolysiloxane elastomer, and have found that, among spherical powders of organopolysiloxane elastomer which have a mean particle size of 0.1-200 &mgr;m, a spherical powder of organopolysiloxane elastomer having a JIS A hardness of 50-100 does not impair the impact strength of a solid cosmetic composition even when the powder is incorporated into the cosmetic composition in a large amount, and provides a solid cosmetic composition having an excellent impact strength. The inventors have also found that a solid cosmetic composition containing a spherical powder of organopolysiloxane elastomer having a JIS A hardness of 50-100 exhibits excellent retention on the skin during use (hereinafter called “cosmetic retention”) and has properties conventionally considered favorable, e.g., exhibiting good skin fittability and spreadability on the skin; imparting a light and smooth sensation when applied by rubbing (hereinafter referred to as light and smooth application sensation); and imparting no strange sensation or irritation to the skin. The present invention has been accomplished based on these findings.
Accordingly, in one aspect of the present invention, there is provided a solid cosmetic composition containing a spherical powder of organopolysiloxane elastomer having a JIS A hardness of 50-100 that has a mean particle size of 0.1-200 &mgr;m (hereinafter referred to as “the solid cosmetic composition of the present invention”).
Preferably, the solid cosmetic composition contains the spherical powder of organopolysiloxane elastomer in an amount of 0.1-50.0 wt. % based on the entirety of the composition.
Particularly preferably, the solid cosmetic composition contains the spherical powder of organopolysiloxane elastomer having a JIS A hardness of 50-80.
As used herein, the term “mean particle size” refers to a value which. is obtained by measuring the diameters in a specific direction of particles under an optical microscope and dividing the sum of respective diameters of particles by the number of measured particles.
The term “JIS A hardness” refers to a hardness measured according to JIS K 6301 by use of the JIS A hardness meter.
The term “solid cosmetic composition” refers to a cosmetic composition which is solidified by compacting powder such as solid face powder, powdery foundation, two-way (i.e., usable with or without water) foundation, foundation usable with water, solid emulsified foundation, or solid cheek rouge.
In a first embodiment of the present invention concerning a method of producing an impact resistant solid cosmetic, a method is provided comprising compression molding into a dish mold powder materials comprising a spherical powder of organopolysiloxane elastomer having a JIS A hardness of 60-100, and a mean particle size of 0.1-200 mm, said elastomer constituting 0.1-50.0 wt % based on the entirety of the cosmetic.
In a second embodiment of the present invention concerning a method of producing an impact resistant solid cosmetic, a method is provided according to the first embodiment above, wherein the powder materials are compression molded at a pressure of between 200 kgf/cm
2
and 300 kgf/cm
2
.
In a third embodiment of the present invention concerning a method of producing an impact resistant solid cosmetic, a method is provided according to the first embodiment above, wherein the powder materials are compression molded at a temperature of between 10° C. and 30° C.
In a fourth embodiment of the present invention concerning a method of producing an impact resistant solid cosmetic, a method is provided according to the first embodiment above, wherein the compacted powder materials in the compacted cosmetic constitute 70.0-99.0 wt %, based on the entirety of the cosmetic.
In a fifth embodiment of the present invention concerning a method of producing an impact resistant solid cosmetic, a method is provided according to the first embodiment above, wherein the impact resistant solid cosmetic further comprises an oily ingredient.
In a sixth embodiment of the present invention concerning a method of producing an impact resistant solid cosmetic, a method is provided according to the fifth embodiment above, wherein the amount of the oily ingredient is 1.0-30.0 wt %.
In a seventh embodiment of the present invention concerning a method of producing an impact resistant solid cosmetic, a method is provided according to the first embodiment above, wherein the organopolysiloxane elastomer has a JIS A hardness of 60-80.
In an eighth embodiment of the present invention concerning a method of producing an impact resistant solid cosmetic, a method is provided according to the first embodiment above, wherein the cosmetic is selected from the group consisting of face powder, powdery foundation, two way foundation, formulations usable with water, solid emulsified formulation, and cheek rouge.
In a ninth embodiment of the present invention concerning a method of producing an impact resistant solid cosmetic, a method is provided according to the first embodiment above, said method comprising compression molding into a dish mold a mixture comprising 70.0-99.0 wt % of said powder materials and 1.0-30.0 wt % of an oily ingredient, said powder materials comprising a spherical powder of organopolysiloxane elastomer having a JIS A hardness of 60-100, and a mean particle size of 0.1-200 mm, said elastomer constituting 0.1-50.0 wt % based on the entirety of the cosmetic.
In a tenth embodiment of the present invention concerning a method of producing an impact resistant solid cosmetic, a method is provided according to the ninth embodiment above, wherein the powder materials are compression molded at a pressure of between 200 kgf/cm
2
and 300 kgf/cm
2
at a temperature of between 10° C. and 30° C.
In an eleventh embodiment of the present invention concerning a method for producing an impact resistant solid cosmetic, a method is provided according to the ninth embodiment above, wherein the powder materials are compression molded at a pressure of between 200 kgf/cm
2
and 300 kgf/cm
2
at a temperature of between 10° C. and 30° C.
In an eleventh embodiment of the present invention concerning a method for producing an impact resistant solid cosmetic, a method is provided according to the first embodiment above, wherein the powder materials are c
Miura Yoshimasa
Suzuki Fukuji
Takahashi Kazuo
Takata Sadaki
Dodson Shelley A.
Shiseido Company Ltd.
Townsend & Banta
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