Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-02-16
2002-06-04
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S489000, C424S078080, C424S078170, C524S865000, C524S866000, C524S860000, C524S506000, C524S588000, C528S032000, C528S033000
Reexamination Certificate
active
06399081
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an organic silicone resin powder comprising a copolymer;produced by polymerization reaction between a reactive group-containing organopolysiloxane and at least one kind of monomer or oligomer capable of reacting to the reactive group, which can improve the feel of cosmetics, wax, coating color and like materials when the powder is mixed therewith, specifically which can elevate spreadability of such materials as cited above, that is, enables the materials to be applied more evenly and more thinly, and further can ensure gloss in their outward appearance.
Further, the invention is concerned with a cosmetic material which contains an organic silicone resin powder comprising a copolymer produced by the polymerization reaction between an organopolysiloxane having reactive group(s) and at least one kind of monomer or oligomer capable of reacting to the foregoing reactive group(s) to improve adhesiveness as well as impressions created by the application thereof, such as a dry feel and a feeling of refreshment, and application characteristics, such as spreadability.
BACKGROUND OF THE INVENTION
The cosmetic materials currently in use comprise a composition containing an inorganic powder, such as titanium oxide, mixed with a resin of hydrocarbon type or silicone type for the purpose of improving the characteristics required therefor and advancing such improvements. The characteristics required for cosmetic materials, as mentioned above, include pleasant feels upon application, such as a dry feel and a feeling of refreshment, spreading properties, such as even and thin application, and texture, such as gloss and color.
For instance, the cosmetic material containing a hydrocarbon type of synthetic resin powder, such as powder of polyethylene resin, polyamide resin, acrylic resin, vinyl chloride resin or epoxy resin, is disclosed in Japanese Tokkai Sho 52-99236 (the term “Tokkai” as used herein means an “unexamined published patent application”).
As examples of a cosmetic material into which a resin of silicone type is compounded, mention may be made of the cosmetic material disclosed in Japanese Tokkai Hei 1-268615, which contains a powder of polyorganosilsesquioxane as a three-dimensionally cross-linked silicone, and the cosmetic material containing finely pulverized silicone rubber having elasticity as disclosed in Japanese Tokko Hei 7-53646 (the term “Tokko” as used herein means an “examined.:patent publication”).
As to the inorganic powder, on the other hand, red iron oxide and titanium oxide have hitherto been used as pigment, and tabular powders, such as mica and sericite, have so far been used as an essential component of nail color, nail coat, face powder, mascara or eyeliner.
Those inorganic powders have hydroxyl groups on their surfaces, so that they are generally used after undergoing silicone, fluoropolymer, metallic soap or activator treatment for weakening their surface activity and the cohesiveness thereof or making the surfaces hydrophobic.
However, the cosmetic materials containing the hydrocarbon type of synthetic resins as recited above are generally apt to have high hardness, and so the application thereof occasionally arises a uncomfortable feeling, such as a hard feel, in the users.
On the other hand, the cosmetic materials containing finely pulverized silicone rubber can wipe away a hard feel, but they are not easy to handle because of lack in fluidity and sometimes difficult to homogeneously mix with other ingredients because of their strong cohesiveness and their inferiority in compatibility.
In general those conventional fine silicone particles are prepared by an emulsion polymerization method. As a result, such particles have a spherical shape or a shape close thereto. While the spherical particles are used in a cosmetic material for the purpose of improving the sliding properties and reducing a tacky feel at the time the cosmetic material is applied to the skin, they lower the adhesiveness of the cosmetic material to the skin because of their shape. Therefore, it is usually tried to improve the adhesiveness by compounding an inorganic tabular powder, such as mica or sericite powder, into a cosmetic material.
However, those inorganic tabular powders have their specific gravity in the range of, 12-3, and so their specific gravity is greater than those of other ingredients to constitute a cosmetic material. In addition, they contain impurities because of natural materials, and so they are dull in color. Accordingly, when such heavy inorganic tabular powders are compounded into a liquid cosmetic material, they cause a problem of precipitation. Further, as the color of such powders become much darker when wetted by oil, compounding with them lowers the color saturation of the resultant cosmetic material.
SUMMARY OF THE INVENTION
The present invention is: made aiming chiefly at dissolving the aforementioned problems. More specifically, a first object of the invention is to provide an organic silicone powder which, when it is compounded with other ingredients into a composition, does not arise in users of the composition an uncomfortable feeling, such as a hard feel or a tacky touch, which is the problem of conventional resin powders of hydrocarbon or silicone type, and forms no sediment because of its low specific gravity, and further can improve the texture of the composition, including the gloss and the touch thereof, and the impressions that the users have upon application thereof, such as spreadability and feels.
A second object of the invention is to provide a method of producing the organic silicone resin powder as mentioned above.
A third object of the invention is to provide a cosmetic material comprising a powder which can impart improved moist or dry feel, and enhanced refreshing effect to the cosmetic material, can elevate not only application characteristics, including spreadability, but also adhesiveness, and further has improved specific gravity, compatibility and dispersibility to form no deposit.
One of the subject matters of the invention is an organic silicone resin powder that has a tabular shape the aspect ratio of which is greater than about 1 land comprises a copolymer produced by polymerization reaction between an organopolysiloxane containing at least one reactive group and at least one kind of monomer or oligomer capable of reacting to the reactive group. Therein, the reactive group may be a radical polymerizable group, while the monomer or oligomer may have radical polymerizability. This organic silicone resin powder may further comprise an inorganic powder.
Another subject matter of the invention is a method of producing an organic silicone resin powder having a tabular shape the aspect ratio of which is greater than about 1, with the method comprising the steps of forming a film from a copolymer produced by polymerization reaction between an organopolysiloxane containing at least one reactive group and at least one kind of monomer or oligomer capable of reacting to the reactive group, grinding the film into a powder, and then putting the powder through a sieve. Therein, the film may be formed using a biaxial extruder.
Still another subject matter of the invention is a cosmetic material which contains an organic silicone resin powder having a tabular shape the aspect ratio of which is greater about 1 and comprising: a copolymer produced by polymerization reaction between an organopolysiloxane containing at least one reactive group and at least one kind of monomer or oligomer capable of reacting to the reactive group. In such a cosmetic material, the foregoing organic silicone resin powder may be contained in a proportion of from about 0.01 to about 50 weight %. In addition, the number average molecular weight of the foregoing copolymers may be from about 2,000 to about 100,000. Further, the cosmetic material may further contain at least one ingredient selected from the group consisting of oils, surfactants and powders.
Herein, the term “aspect ratio” is defined as the b/a ratio, when
Miyadai Shinji
Nakanishi Tetsuo
Ono Ichiro
Di Nola-Baron Liliana
Millen White Zelano & Branigan P.C.
Page Thurman K.
Shin-Etsu Chemical Co. , Ltd.
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