Cosmetic raw materials, cosmetic products, and methods of...

Drug – bio-affecting and body treating compositions – Live hair or scalp treating compositions – Polymer containing

Reexamination Certificate

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C424S070122, C514S938000

Reexamination Certificate

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06238656

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
REFERENCE TO A MICROFICHE APPENDIX
Not applicable.
FIELD OF THE INVENTION
The present invention relates to a cosmetic raw material, a cosmetic product, and to a method for manufacturing a cosmetic product. More specifically, the invention concerns a cosmetic raw material which is a silicone oil and crosslinked silicone particles that can be uniformly dispersed in a cosmetic product; a cosmetic product which is prepared from the cosmetic raw material in combination with another cosmetic raw material, which has a good feeling on fingers and skin, good spreading characteristics, and good feeling during use, and which prevents hair from “flying away” and tangling, have good hair set retention, and add dryness and freedom from oiliness to hair; and a method of manufacturing the cosmetic product.
BACKGROUND OF THE INVENTION
It is known to improve the smoothness and touch sensation of a cosmetic product by utilizing a silicone oil, crosslinked silicone particles, or combinations of both as a cosmetic raw material from which a cosmetic product is prepared. Cosmetic products prepared by utilizing both a silicone oil and crosslinked silicone particles are known.
For example, Japanese Laid Open Patent Applications [Kokai] Hei 1-165,509 and Hei 1-190,757, describe cosmetic products formed by compounding crosslinked silicone particles having three dimensional net like structures, with a silicone oil of high or low viscosity.
Japanese Laid Open Patent Application [Kokai] Hei 1-207,354 describes a cosmetic product composed of a crosslinked silicone of a hydrosilation crosslinkable silicone composition and a silicone oil of low viscosity.
Japanese Laid Open Patent Application [Kokai] Hei 3-79,669 describes a cosmetic product prepared from a crosslinked silicone, a low viscosity silicone oil, a polyoxyalkylene modified silicone type surface active agent, and water.
Japanese Laid Open Patent Application [Kokai] Hei 3-271,211 describes a cosmetic foundation that comprises a silicone oil emulsion composed of a low viscosity silicone oil and a silicone which is a solid at room temperature.
Japanese Laid Open Patent Application [Kokai] Hei 6-502,646 (U.S. Pat. No. 5,154,849 issued Oct. 13, 1992), describes a skin cleansing composition composed of a silicone rubber and a silicone oil.
Japanese Laid Open Patent Application [Kokai] Hei 7-330,537 describes a cosmetic product composed of a high molecular weight silicone and a silicone rubber.
Japanese Laid Open Patent Application [Kokai] Hei 2-172,906, Hei 5-139,932, and Hei 10-36228 describe hair cosmetic products composed of a silicone oil and a crosslinked silicone particle. More specifically, Japanese Laid Open Patent Application [Kokai] Hei 2-243612 (U.S. Pat. No. 4,980,167 issued Dec. 25, 1990), and Hei 5-262987 describe hair cosmetic products comprised of a crosslinked silicone particle with a silicone oil.
However, since these cosmetic products are prepared from cosmetic raw materials comprising a silicone oil and crosslinked silicone particles compounded with another cosmetic raw material, their manufacture is a problem. In particular, the crosslinked silicone escannot be sufficiently dispersed in the cosmetic product; the silicone oil and the crosslinked silicone particles have poor affinity to each other; and when mixed together, they lose their original properties.
More specifically, when water based cosmetic products are prepared and a silicone oil and crosslinked silicone particles are dispersed in another cosmetic raw material, it becomes impossible to develop a sufficient shear force, such that the resulting cosmetic product either cannot acquire sufficient stability or it produces unpleasant sensations in its application.
BRIEF SUMMARY OF THE INVENTION
It is an object of the present invention to provide a cosmetic raw material that allows uniform dispersion of a silicone oil and crosslinked silicone particles in a cosmetic product; a cosmetic product prepared from the cosmetic raw material in combination with another cosmetic raw material, which is pleasant to the touch by the fingers and skin, which has good spreadability and a pleasant feeling when applied, which prevent hair from “flying away” and tangling, have good hair set retention, and add dryness and freedom from oiliness to hair; and to a method of manufacturing the cosmetic product.
The cosmetic raw material of the present invention is a silicone oil emulsion which contains crosslinked silicone particles having an average diameter of 0.05 to 100 &mgr;m, in silicone oil drops having an average diameter of 0.1 to 500 &mgr;m, dispersed in water. The diameter of the crosslinked silicone particles are smaller than the diameter of the silicone oil drops.
In another embodiment, the cosmetic raw material is characterized by being a silicone composition obtained by removing water from the above silicone oil emulsion, and which contains the crosslinked silicone particles dispersed in the silicone oil.
In a further embodiment, a cosmetic product is provided which is a cosmetic raw material prepared from the above silicone oil emulsion in combination with another cosmetic raw material.
In yet another embodiment, the cosmetic product is a cosmetic raw material prepared from the above silicone composition in combination with another cosmetic raw material.
In the final embodiment, there is provided a method of manufacturing a cosmetic product by compounding the cosmetic raw material prepared from the above silicone oil emulsion in combination with another cosmetic raw material.
These and other features of the invention will become apparent from a consideration of the detailed description.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
Not applicable.
DETAILED DESCRIPTION OF THE INVENTION
As noted above, the cosmetic raw material in one embodiment of the present invention is characterized by being a silicone oil emulsion having crosslinked silicone particles in silicone oil drops dispersed in water.
The crosslinked silicone particles contained in the emulsion can be produced by subjecting a crosslinkable silicone composition to a hydrosilation crosslinking reaction, a condensation crosslinking reaction, crosslinking with the use of an organic peroxide, or crosslinking caused by irradiation with high energy rays. Most preferable are hydrosilation and condensation crosslinking reactions.
There are no special limitations with regard to the type of the oil used in the emulsion for forming the silicone oil drops. Preferably, however, is should be a silicone oil having a linear, partially branched linear, cyclic, or branched molecular structure. Most preferably, the silicone oils should have a linear or a cyclic structure. It is preferred that the silicone oil not participate in the crosslinking reaction during the formation of the crosslinked silicone particles. In other words, when the crosslinked silicone particles are formed by a hydrosilation crosslinking reaction, it should be a silicone oil which does not contain in its molecules alkenyl groups or silicon bonded hydrogen atoms.
Thus, the silicone oil can be a dimethylpolysiloxane having both molecular terminals capped with trimethylsiloxy groups, a methylphenylpolysiloxane having both molecular terminals capped with trimethylsiloxy groups, a copolymer of methylphenylsiloxane and dimethylsiloxane having both molecular terminals capped with trimethylsiloxy groups, a copolymer of methyl-(3,3,3-trifluoropropyl)siloxane and dimethylsiloxane having both molecular terminals capped with trimethylsiloxy groups, a cyclic dimethylsiloxane, or a cyclic methylphenylsiloxane.
When the crosslinked silicone particles are formed by means of a condensation crosslinking reaction, the oil should not contain in its molecule any silanol groups, silicon bonded hydrogen atoms, or silicon bonded hydrolyzable groups. For example, the silicone oil

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