Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1999-05-12
2001-06-26
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S069000, C514S844000
Reexamination Certificate
active
06251411
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to compositions used in preparing cosmetic products and to such cosmetic products made therewith and specifically to liquid and solid cosmetic products for external use and having the characteristics of being smooth, adhesive, spreadable, and long-lasting.
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; whereby, 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, which is 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 problem (i). For example, pigments or extender pigments and/or substrates which 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 parent patent application U.S. Ser. No. 08/658,461, now U.S. Pat. No. 5,897,868 ('868 patent), 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 '868 patent 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 '868 patent 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 was in contrast to the simple non-attached coating 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. Though effective in processing and use and with superior resultant products, transportation of the slurry described in parent '868 patent is costly, due to the weight of liquid suspending medium.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a composition and a processing method which improves both the characteristics and economics of cosmetics made in accordance with the teachings of the parent '868 patent by including all the components required by the parent patent except the liquid suspending medium, whereby transportation cost of the composition for preparing cosmetic product is reduced while processing is still simplified, and without problems engendered by ambient moisture.
Generally the present invention provides a composition for cosmetic products, which comprises particles of pigments and/or extender pigments, water-soluble metal salt, and one or more hydrophobidizing agents. As in the parent application the hydrophobidizing agents include hydrogenated lecithin and water-soluble alkali salt of fatty acids, acylamino acids, and acyl collagen and combinations thereof. Means are further provided to prevent premature chemical interaction resulting from ambient moisture prior to the addition of a liquid suspending medium containing water.
When liquid suspending medium containing water is added to the composition, the pigments and/or extender pigments are made hydrophobic with hydrophobidizing agent having a lipophilic moiety attached to the surface.
DETAILED DESCRIPTION OF THE INVENTION
In accordance with the present invention, when liquid suspending medium containing water is added, pigments or extender pigments are made hydrophobic in an aqueous environment with an agent having a lipophilic moiety, such as a water-insoluble polyvalent metal salt of a fatty acid, an acylamino acid, hydrogenated lecithin, acyl collagen or like materials. In particular, the surface of the particles of the pigments and extender pigments carry lipophilic moieties (provided by the fatty acid etc.) linked to the surface of the particles by means of the polyvalent metal. Suitable polyvalent metals include alkaline earth metals, such as magnesium, and calcium, and other polyvalent metals, such as aluminum, titanium, zinc, zirconium and the like. This linking is more than just a coating as takes place in prior art materials such as disclosed in said Miyoshi patents, with resultant differences in dispersion properties as discussed above.
After the liquid suspending medium containing water is added and the mixture is kneaded, liquid suspending medium and an oily substance (if desirable but not required) are added until the resultant slurry reaches an appropriate viscosity. This slurry is then used for the preparation of cosmetic products. The slurry composition may be (but not necessarily) injected into the back of a container for the cosmetic product by an
Imai Isao
Kalriess William
Kishida Shigeru
Kobayashi Masaru
LePage Mark
Fubara Blessing
Greenberg & Traurig, LLP
Page Thurman K.
U.S. Cosmetics Corporation
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