Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-12-26
2003-02-25
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S069000
Reexamination Certificate
active
06524597
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pressed powder cosmetic composition which has smooth and soft touch feeling, is excellent in feeling upon use and does not crack easily by an external force.
2. Description of the Related Art
A pressed powder cosmetic composition such as foundation, face powder or eye shadow is usually prepared by press molding, that is, solidification of a raw material composition, which has been filled in a container, by compression. Since a conventionally-employed pressed powder cosmetic composition contains an oil in a relatively small amount, a high molding pressure is required in order to overcome its weak powder-to-powder binding power. The press-molded product thus obtained is usually very hard and lacks soft touch feeling.
Lowering in the hardness of a pressed powder cosmetic composition, on the other hand, decreases its powder-to-powder binding power, which tends to cause cracking of the molded product of the composition by an external force.
A pressed powder cosmetic composition can also be prepared by the solvent method (Japanese Patent Application Laid-Open No. 108073/1981) wherein a mixed slurry, which has been obtained by mixing base materials including powder with a low-boiling-point organic solvent, is filled in a container, followed by removal of the solvent to solidify the slurry.
Although the solvent method is advantageous because it permits uniform filling of the mixture in a container, it is accompanied with the drawbacks that evaporation of a large amount of the solvent from the slurry during drying causes shrinkage or cracks, and the press-molded product in the container tends to be cracked by an external force or tends to develop caking.
SUMMARY OF THE INVENTION
An object of the present invention is therefore to provide a pressed powder cosmetic composition which has smooth and moisturized touch feeling, is excellent in feeling upon use, for example, easy release of powder, and does not crack easily.
The present inventors have found that a pressed powder cosmetic composition capable of attaining the above-described object is available by the use of a specific powder and a polymer having a specific modulus of elasticity in combination with an oil.
In the present invention, there is thus provided a pressed powder cosmetic composition, which comprises the following components (A), (B) and (C):
(A) a water-repellent and oil-repellent powder selected from the group consisting of fluorine resin powders and a powder having a surface treated with a fluorine compound,
(B) a film-forming polymer having a modulus of elasticity not greater than 200 kg/cm
2
, and
(C) an oil.
The present invention makes it possible to provide a pressed powder cosmetic composition which has smooth and soft touch feeling, permits easy powder release therefrom and is therefore excellent in feeling upon use, is free from cracks and is not broken easily by an external force. The pressed powder cosmetic composition of the present invention is suited, for example, as makeup cosmetic compositions such as foundation, face powder, cheek rouge and eye shadow.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The water-repellent and oil-repellent powder to be used as Component (A) in the present invention is selected from fluorine resin powders each originally having a water-repellent and oil-repellent surface and powders each having a surface treated with a fluorine compound. Examples of the powder to be treated with a fluorine compound include inorganic powders such as silicic acid, silicic anhydride, magnesium silicate, talc, sericite, mica, kaolin, red iron oxide, clay, bentonite, titanium-coated mica, bismuth oxychloride, zirconium oxide, magnesium oxide, zinc oxide, aluminum oxide, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, iron oxide, ultramarine blue pigment, chromium oxide, chromium hydroxide, calamine, and carbon black, and complexes thereof; organic powders such as polyamide, polyester, polypropylene, polystyrene, polyurethane, vinyl resin, urea resin, phenol resin, silicon resin, acrylic resin, melamine resin, epoxy resin, polycarbonate resin, divinylbenzene styrene copolymer, silk powder, cellulose powder, metal salts of a long-chain alkyl phosphoric acid, and N-mono (long chain) alkylacyl basic amino acid and complexes thereof; and complex powder of the above-exemplified inorganic powder and organic powder.
As the fluorine compound for treating the surface of the above-exemplified powder, a polyfluoroalkylphosphoric acid (U.S. Pat. No. 3,632,744) represented by the following formula (a):
[C
x
F
2x+1
C
y
H
2y
O]
z
PO(OH)
3−z
(a)
wherein, x stands for 1 to 20, y stands for 1 to 5 and z stands for 1 or 2 can be mentioned as an example. Additional examples include fluoroalkyldi(oxyethyl)amine phosphate esters (Japanese Patent Application Laid-Open No. 250074/1987), fluoroalkyl-containing polymers (Japanese Patent Applications Laid-Open Nos. 167209/1980, 55481/1986, and 48803/1986), fluorine resins such as ethylene tetrafluoride (Japanese Patent Application Laid-Open No. 38707/1982), fluoroalcohols (Japanese Patent Applications Laid-Open No. 2251/1988 and 2252/1988), perfluoroepoxy compounds, sulfoamide type fluorophosphoric acid, perfluorosulfate salts, perfluorocarboxylate salts, perfluoroalkylsilanes (Japanese Patent Applications Laid-Open Nos. 318070/1989, 218603/1990, 160907/1989, 127477/1990, silane coupling agents such as “LP-1T, LP-4T and LP-8T”, each trade name; product of Shin-Etsu Silicone Co., Ltd.), fluorine-containing halogenated hydrocarbons (flon) such as trichlorotrifluoroethane (Japanese Patent Application Laid-Open No. 318070/1989), fluoroalkyl-containing polyhydric alcohols, fluoroalkyl-containing polyoxyethylene compounds (Japanese Patent Applications Laid-Open Nos. 180810/1989 and 180811/1989), fluoroalkyl-containing sulfoamide carboxylic acids, and fluoroalkyl-containing acrylate ester copolymers (U.S. Pat. No. 3,632,744).
Out of these, perfluoroalkylphosphoric acids and salts thereof, polyfluoroalkylphosphoric acids, fluoroalkyldi(oxyethyl)amine phosphate esters, perfluorosulfate salts, perfluorocarboxylate salts and perfluoroalkylsilanes are particularly preferred.
There is no particular limitation imposed on the method of treating the surface of a powder. It may be carried out in a manner known per se in the art. Based on 100 parts of the powder, the fluorine compound is preferably added in an amount of 0.05 to 20 parts by weight, more preferably 2 to 10 parts by weight for the surface treatment.
The water-repellent and oil-repellent powder as described above is incorporated into the pressed powder cosmetic composition of the present invention together with other powder as needed. The water-repellent and oil-repellent powder is preferably used in an amount not less than 50 wt. % in the whole powder components from the viewpoint of feeling upon use. The total amount of the powder in the whole composition is preferably 55 to 99.9 wt. %, especially 65 to 99.9 wt. %, more especially 75 to 99.9 wt. %.
As the other powder, those mentioned above for the surface treatment with a fluorine compound can be used without the surface treatment.
The film-forming polymer to be used in the invention as Component (B) is preferred to have a modulus of elasticity not greater than 200 kg/cm
2
, especially 1 to 200 kg/cm
2
, more especially 1 to 100 kg/cm
2
. When a polymer having a modulus of elasticity exceeding 200 kg/cm
2
is employed, the product available therefrom becomes poor in feeling upon use with deteriorated softness or smoothness.
In the present invention, the modulus of elasticity was measured in the following manner.
A sample film for measurement was prepared by weighing 10 g of a 10 wt. % solution or dispersion of a film-forming polymer on a TEFLON-made Petri dish of 5 cm in diameter, naturally drying it for 5 to 10 days to form a film (0.3 to 0.5 mm in thickness), and cutting the film into strips, each 15 mm lo
Howard S.
Kao Corporation
Page Thurman K.
LandOfFree
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