Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-06-29
2003-12-09
Padmanabhan, Sreeni (Department: 1617)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S078020, C424S078170, C514S063000, C514S772100, C556S400000
Reexamination Certificate
active
06660281
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to novel silicones for powder treatment, powders having the surface treated with such silicones, and cosmetic materials containing such surface-treated powders. More specifically, the invention is concerned with silicones that are used for surface treatment of powders to provide the treated powders with high affinity for general fats and oils, such as ester oils and glycerides, silicone oils and fluorinated oils, and further with cosmetic materials which contain the powders having the surface treated with the aforesaid silicones to acquire excellent dispersibility and stable emulsion state and ensure a dry feel for the users.
BACKGROUND OF THE INVENTION
In general the makeup is smeared with secretion from humans, such as sweat, tear and sebum. In particular, the leading cause of the makeup spoilage consists in that the powder in a cosmetic material is wetted excessively by the sebum secreted from the skin in addition to oil ingredients compounded in the cosmetic material. Therefore, with the intention of reducing the oil ingredients remaining on the skin after the makeup is done, it has been attempted to use volatile oils, such as octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane, as a part of the oil ingredients compounded in a cosmetic material.
Further, the rub and the water given to the makeup constitute external factors inhibiting the makeup effect from lasting long. For the purpose of preventing the makeup from coming off by contact with aqueous substances, such as sweat and tears, or maintaining the skin protecting effect by preventing a loss of water-soluble components and sebum in the skin, it has been carried out to heighten the water repellency by mixing a silicone oil in the cosmetic material. In recent years, the silicone oils, represented, e.g., by dimethylpolysiloxanes, have been prevailingly used as an oil ingredient for cosmetic materials because of their characteristics, including light feel, excellent water repellency and high safety.
On the other hand, the pigments represented by ferric oxide red and titanium dioxide, and powders such as mica and sericite are widely used in the field of cosmetics, including nail color, nail coat, face powder, mascara and eye liner. In using these powders for cosmetics, the powder surface is generally subjected to treatment with metal soap, alumina, silica or phosphoric acid for the purpose of imparting sufficient water repellency and safety to the powders.
For instance, the method ofusing 12 to 60 parts by weight of methylhydrogenpolysiloxanes per 100 parts by weight of powders to effect surface treatment of the powders is disclosed in Japanese Patent 2,719,303, and the method of using the straight-chain silicone having one alkoxy-modified end for surface treatment of powders is disclosed in Japanese Tokkai Hei 7-196946 (the term “Tokkai” as used herein means an “unexamined published patent application”). Although the powder treatment with silicones is a generally known art, it has been desired to develop special silicones capable of ensuring further improvements in compatibility between the treated powders and general oils, fluorinated oils or silicone oils, and besides, enhanced stability in emulsions containing both treated powders and those oils.
SUMMARY OF THE INVENTION
As a result of our intensive studies aiming at developing cosmetic materials having a light feel, sufficiently high water repellency and a makeup effect of long-duration, it has been found that the powders treated with one-end reactive silicone-grafted silicone compounds have extremely high water repellency, sufficient dispersibility in volatile oils, such as octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane, and good usability as powders for cosmetic materials, and besides, the cosmetic materials using them have a light feel, thereby achieving the present invention.
Therefore, a first object of the invention is to provide a powder-treating agent which has good affinity for fats and oils used in general cosmetic materials and can impart excellent capability for emulsification to the powder.
A second object of the invention is to provide a powder having good affinity for fats and oils used in general cosmetic materials and high capability for emulsification.
A third object of the invention is to provide a cosmetic material having excellent storage stability in an emulsified condition.
The above-described objects are attained with silicones represented by the following formula (1) as a powder-treating agent, a powder treated with the aforesaid silicones, and a cosmetic material containing the aforesaid powder:
R
1
a
R
2
b
R
3
c
SiO
(4−a−b−c)/2
(1)
wherein R
1
groups, which are the same or different, each represent an organic group selected from the class consisting of alkyl groups containing 1 to 30 carbon atoms, aryl groups, aralkyl groups, fluorinated alkyl groups and organic groups represented by the following formula (2); R
2
groups each represent a reactive substituent selected from the class consisting of a hydrogen atom, a hydroxyl group and alkoxy groups containing 1 to 6 carbon atoms, which is attached to a silicon atom in the siloxane chain directly or via a linkage group comprising at least one carbon, oxygen or silicon atom; R
3
groups each represent a silicone compound residue represented by the following formula (3); a is a number of from 1.0 to 2.5; b is a number of from 0.001 to 1.5; and c is a number of from 0.001 to 1.5
wherein R
4
is a hydrocarbon group containing 4 to 30 carbon atoms or an organic group represented by R
5
—(CO)—; R
5
is a hydrocarbon group containing 1 to 30 carbon atoms; d is an integer of from 0 to 15, e is an integer of from 0 to 50, and f is an integer of from 0 to 50; and x is an integer of from 1 to 5, and y is an integer of from 0 to 500.
The powders surface-treated with the aforementioned silicones have good affinity for oils generally used in cosmetic materials, such as other silicone oils, ester oils and hydrocarbon oils, and so they have excellent capability for emulsification. Therefore, the emulsions using the powders surface-treated with the present silicones have excellent storage stability, and so they can be effectively applied to cosmetic materials.
DETAILED DESCRIPTION OF THE INVENTION
As described above, the present silicone compounds are represented by formula R
1
a
R
2
b
R
3
c
SiO
(4−a−b−c)/2
(referred to as formula (1)).
Each R
1
group in formula (1) represents an organic group selected from the class consisting of 1-30C alkyl groups, aryl groups, aralkyl groups, fluorinated alkyl groups and organic groups represented by —C
d
H
2d
—O—(C
2
H
4
O)
e
(C
3
H
6
O)
f
R
4
(which is referred to as formula (2)), wherein d, e and f are each an integer and fall within the following ranges: 0≦d≦15, 0≦e≦50, 0≦f≦50; R
4
represents a 4-30C hydrocarbon group or an acyl group represented by R
5
—(CO)—; and R
5
represents a 1-30C hydrocarbon group.
Examples of an alkyl group as R
1
include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group and a decyl group; those of a cycloalkyl group as R
1
include a cyclopentyl group and a cyclohexyl group; those of an aryl group as R
1
include a phenyl group and a tolyl group; those of an aralkyl group as R
1
include a benzyl group and a phenetyl group; and those of a fluorinated alkyl group as R
1
include a trifluoropropyl group and a heptadecafluorodecyl group.
In addition, examples of an organic group represented by formula (2) include higher alcohol residues, such as residues of higher alcohols, such as cetyl alcohol, oleyl alcohol and stearyl alcohol, and polyoxyalkylene adducts thereof; higher alcohol alkenyl ether residues, and polyoxyalkylene adducts thereof; higher fatty acid residues, such as residues of oleic acid, stearic acid and behenic acid, and polyoxyalkylene adducts thereof; and higher fatty acid alkenyl ester resi
Nakanishi Tetsuo
Ono Ichiro
Sakuta Koji
Millen White Zelano & Branigan P.C.
Padmanabhan Sreeni
Shin-Etsu Chemical Co. , Ltd.
Wells Lauren Q.
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