Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1999-04-26
2002-07-09
Dees, Jose′ G. (Department: 1619)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S069000, C424S059000, C424S063000, C424S705000, C428S403000
Reexamination Certificate
active
06416766
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a slurry for preparing cosmetic products and to such cosmetic products made through the use of this slurry. More specifically, the present invention provides a process for preparing smooth, adhesive, spreadable, long-lasting cosmetic products for external use, such as solid or solid-like, cake cosmetic products, such as make-up preparations, as well as liquid cosmetic products such as liquid foundation.
BACKGROUND OF THE INVENTION
Solid or solid-like, cake cosmetic products, such as make up preparations (e.g. face powder, powder foundation, eye shadow, mascara, rouge and the like) are conventionally produced by filling a cosmetic powder into a metal or plastic pan or case followed by molding the powder by a press. In particular, the conventional manufacturing process for preparing cosmetic products includes mixing pigments, and extender pigments and then atomizing them until the colors are well dispersed and uniform. Oily ingredients and auxiliary agents, such as anti-bacterial agents, are added to the pigments and extender pigments and mixed and are atomized to disperse the oily ingredients. The resulting mixture is then screened and further mixed until a uniform cosmetic powder is obtained. The cosmetic powder is filled into a pan or case and molded by a press.
This conventional process has several disadvantages:
i) Pigments and extender pigments have inherent strong hydrophilic properties; thereby, they will fade and/or discolor when contacted by perspiration, unless they are specially treated.
ii) The percentage of out-of-specification product is unacceptably high due to the non-uniformity of surface-color and/or surface-hardness of the molded cosmetic product.
iii) Multi-color molding and complex shape molding are quite expensive because of the cost of the shaping-mold, typically machined from metal.
iv) high labor costs are incurred, arising from the manual labor needed for adjustment and maintenance of equipment and the supply of bulk powder.
v) The loss of cosmetic powder during the molding process is significant.
vi) The work environment is undesirable due to the exposure of the workers to powdery dusty pigments and extender pigments.
It has previously been proposed to use pigments that have been made hydrophobic to solve the problem (i). For example, pigments or extender pigments and/or substrates that are surface-treated with silicone are strongly hydrophobic and can be used to prevent color fading and to improve the duration of use before reapplication. They can also be used for two-way cake (wet/dry application) cosmetics.
While the use of polysiloxanes ameliorates problem (i), the molding process becomes more complex and time consuming, and problems (ii), (iii), (iv), (v), and (vi) remain unsolved.
There have been some suggestions to solve problems (ii), (iii), (iv), (v), and (vi). For example, Japanese Patent 07-29904 and U.S. Pat. No. 4,967,810 suggest the use of a slurry in which pigments, extender pigments and/or substrates, and oily ingredients are dispersed in an organic solvent for injection into the pan or case by an injection machine. These proposals may reduce the severity of problems (ii), (iii), (iv), and (v), but problem (vi) remains unsolved. Further, the choice of usable oily ingredients is restricted depending on the kind or nature of the organic solvent used. For example, non-uniformity of the product is observed when an alcohol is used as the organic solvent with a silicone oil as the oily ingredient of the cosmetic product.
In co-pending parent application 08/658461, a simplified process is described, to decrease the labor intensity of the conventional processes, to improve the work environment, and to provide a smooth, adhesive, spreadable, and long-lasting cosmetic product.
The invention of the parent application was based upon the discovery that when the pigments or extender pigments and/or substrates are made hydrophobic in an aqueous environment with an agent having a lipophilic moiety, such as water-insoluble metal salts of fatty acids, acylamino acids, hydrogenated lecithin, acyl collagen and the like, and rinsed and dried but not completely dried, the pigments remain hydrophilic until full drying. In such state the oily materials are added and the mixture thus formed is kneaded to form an aqueous slurry, the oily materials are uniformly bound to the surface of the pigments and extender pigments and are not disassociated. The parent application thus provided an aqueous slurry for cosmetic products with good dispersal characteristics (without the need for any irritating surfactants for the purpose of dispersing pigments, as is normally required for acceptable dispersal), which comprised particles of pigments and/or extender pigments having a lipophilic moiety attached-to-the surface thereof. This is in contrast to a simple coating (not an attachment) as disclosed in the various Miyoshi U.S. Pat. Nos. 4,606,914, 4,623,074 and 4,863,800, used with the same general materials but which do require the use of surfactants for effecting a dispersion in an aqueous slurry; and a cosmetically acceptable oily ingredient dispersed in a liquid suspending medium consisting essentially of water.
SUMMARY OF THE INVENTION
It is an object of the present invention to improve both the characteristics and economics of the cosmetics made in accordance with the teachings of the parent application by including oily components into the aqueous medium or slurry but without detriment, without the need for surfactants for the purpose of dispersing pigments and whereby processing is also simplified.
It is a further object of the present invention to provide either an oil-in-water slurry composition with a resultant cosmetic having a fresher feel or a water-in-oil slurry composition having a creamier feel and better skin adhesion, with both slurry compositions being well dispersed without surfactants for helping effect such dispersal.
To avoid confusion, as used in the present application, the term “oily materials” refers to oil binders but which are not required to make a slurry during processing. “Oily components” may however be used to improve the quality of a product.
As used in the present application, the term “oily components” refers to oils needed to make the oil phase of an emulsion with at least one “oily component” being required to make the emulsion.
The term “oily ingredients” refers to all other oils such as used in referring to the prior art.
Generally the present invention comprises the aqueous slurry of the parent application made with the hydrophobidized materials, wherein a cosmetically acceptable oily component is included therein as a liquid suspending medium and wherein one of two continuous phases is formed: (a) oil in water (O/W), and (b) water-in-oil (W/O), depending on the relative amounts of oil and water, without the need for inclusion of irritating surfactants for the purpose of maintaining an emulsion by dispersing of the pigment particles. Factors that affect emulsion type include phase volume relations, ingredient interactions, surface characteristics of ingredients as well as other factors.
Pigments and extender pigments that have been hydrophobidized and completely dried have been surprisingly found to be utilizable in making the oil and water slurry emulsion without the necessity for surfactants for the purpose of dispersing pigments (in contrast to the parent application of a fully aqueous slurry wherein the pigments and extender pigments are not fully dried and are still hydrophilic). It is an unexpected discovery wherein a fully hydrophobidized material is acceptably dispersible into a stable emulsion in a slurry containing water and an oil component but without surfactants added for the purpose of dispersing pigments.
As in the parent application the hydrophobidizing agents include silicone, metal soaps and combinations thereof.
With the inclusion of an oil phase, the use of a back injection machine in the processing, as disclosed in the parent application, is not required a
Imai Isao
Kishida Shigeru
Kobayashi Masaru
Radcliffe Heidi A.
Dees Jose′ G.
Haghighatian Mina
U.S. Cosmetics Corporation
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