Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Reexamination Certificate
2002-11-26
2004-06-08
Moore, Margaret G. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
C528S029000, C528S031000, C528S042000, C424S401000, C556S445000
Reexamination Certificate
active
06747115
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a silicone polymer which is insoluble in organic solvents because it has a three-dimensional crosslinked structure which swells up relative to fluorosilicone oils, to a paste-like composition formed by making the silicone compounds swell up in silicone oil, and to a cosmetic material.
BACKGROUND OF THE INVENTION
In various fields including that of cosmetic products, silicone oils have long been used as base oils on account of their safety.
In particular, with regard to skin care and make up, low viscosity silicone oils of 100 mm
2
/s are very popular on account of their excellent spreading properties, clean feel and high safety.
However, when for example a paste composition without fluidity is made up with a low viscosity silicone oil as base oil, the addition amount of thickener has to be increased, and consequently it is difficult to obtain a smooth, even composition. Moreover, the low viscosity silicone oil tends to separate and leak from the composition obtained, so stability was low. To solve this problem, organic materials such as dextrin fatty acid esters (Japanese Patent Laid-Open Sho 62-121764, 62-143971, 62-143970, 63-159489), cane sugar fatty acid esters (Japanese Patent Laid-Open Sho 63-235366), trimethylsilyl polyvinyl alcohol or trimethyl silyl oligosaccharides (Japanese Patent Laid-Open Sho 62-240335) and fatty acid ester group-containing cellulose ethers (Japanese Patent Laid-Open Sho 63-260955), or inorganic materials such as organically modified clay minerals (Japanese Patent Laid-Open Sho 62-45656, 62-54759, 63-72779), have been used as thickeners for low viscosity silicone oils.
However, when these organic or inorganic materials were used as thickeners, there was a problem in that the clean feel and high extendibility of the low viscosity silicone oil decline.
In this connection, a method was proposed obtain a uniform paste-like composition by using a specific silicone polymer as a thickener, and treating the low viscosity silicone oil under a shear force (Japanese Patent Laid-Open 2-43263).
However, in the field of cosmetic products, not only oil but also water must be blended with the composition as an essential component. In this case, surfactants are used according to the normal procedure, but it is difficult to disperse the silicone oil and water in a homogeneous, stable state. Also, although the silicone thickener disclosed in the aforesaid Japanese Patent Laid-Open 2-43263 has excellent thickening properties relative to the silicone oil, it does not disperse evenly when water is also blended in the composition. Moreover, some surfactants irritate the skin, and their use is therefore undesirable.
To solve this disadvantage, in Japanese Patent Laid-Open Hei 4-272932, and 5-140320, it was proposed to introduce a polyoxyalkylene group in the molecule of the silicone thickener.
At the same time, to improve the staying powers of the cosmetic material, it has been proposed to blend a silicone oil having excellent water repellence and oil repellence and a high fluorine content with the silicone oil. However, although these oils have a high water repellence and oil repellence, water and oil tend to separate from them in storage. Consequently, it was difficult to obtain a cosmetic material having excellent storage stability, and excellent functional properties when it was used on the skin.
Problems Which This Invention Attempts to Solve
It is therefore an object of this invention to provide a silicone polymer having a fluorine-modified oil with excellent water repellence and oil repellence as base oil, and which swells up relative to these oils, to a homogeneous paste-like composition using this silicone polymer, and to a cosmetic material comprising this composition.
Means to Solve the Above Problems
This invention, which was discovered as a result of intensive studies performed to achieve the above object, is a silicone polymer having a three-dimensional crosslinked structure obtained by polymerizing at least one selected from the group consisting of an organohydrogen polysiloxane represented by the general formula (A1):
R
1
a
R
2
b
H
c
SiO
(4−a−b−c)/2
, (A1)
and an organohydrogen polysiloxane represented by the general formula (A2):
R
1
d
H
e
SiO
(4−d−e)/2
, (A2)
and at least one selected from the group consisting of a polyoxyalkylene represented by the following general formula (B1):
C
f
H
2f−10
(C
g
H
2g
O)
n
C
f
H
2f−1
, (B1)
a polyoxyalkylene represented by the following general formula (B2):
a polyoxyalkylene represented the following general formula (B3):
and an organopolyoxy alkylene (B4) represented by the following general formula (B4):
R
1
j
R
5
k
SiO
(4−j−k)/2
, (B4)
which can contain (or dissolve and swell) its same weight or more of pentane-3,3,3-trifluoropropyl pentamethylcyclopentasiloxane (in the formula, R
1
, which may be the same or different, is a hydrocarbon group having 1 to 20 carbon atoms, which do not contain an aliphatic unsaturated bond and may be substituted or unsubstituted, whereof about 11 to 60 mole % is a fluorine-substituted monovalent hydrocarbon group, R
2
, which may be the same or different, is an organic group represented by the general formula —C
f
H
2f
O(C
g
H
2g
O)
n
R
6
, R
3
, which may be the same or different, is hydrogen atom or a monofunctional hydrocarbon group containing 1 to 10 carbon atoms which does not contain aliphatic unsaturated bonds and which may be substituted or unsubstituted, R
4
, which may be the same or different, is an organic group identical to R
3
or represented by —C
f
H
2f−1
, R
5
is a monofunctional hydrocarbon group having 2 to 10 carbon atoms containing a terminal vinyl group, and R
6
is a hydrogen atom or a monofunctional hydrocarbon group or acetyl group not containing aliphatic unsaturated groups, which may be substituted or and substituted, a is about 1.0-2.3, b is about 0.001 to 1.0, c is about 0.001-1.0, d is about 1.0-2.3, e is about 0.001-1.0, j is about 1.0-2.3, and k is about 0.001-1.0, and about 1.5≦a+b+c≦about 2.6, about 1.5≦d+e≦about 2.6, about 1.5≦j+k≦about 2.6, f is an integer in the range 2-6, g is 2, 3 or 4, h is an integer in the range 1-200, i is an integer in the range 1-20, and x is 0 or 1. ).
The silicone polymer obtained by polymerizing the organohydrogen polysiloxane expressed by the above general formula (A2) and the organopolysiloxane expressed by the above general formula (B4), or the silicone polymer obtained by polymerizing the organohydrogen polysiloxane expressed by the above general formula (A2) and the polyoxyalkylene expressed by the above general formula (B1), are preferred.
The paste-like silicone composition obtained by kneading a mixture of 100 weight parts of the above silicone polymer and 10-1000 weight parts of a fluorine-modified silicone oil, which is represented by the general formula (C):
R
1
m
SiO
(4−m)/2
(C)
having a viscosity of less than about 200 mm
2
/s at 25 degree C. (R
1
may be identical or different, are monofunctional hydrocarbon groups having 1 to 20 carbon atoms not containing an aliphatic unsaturated bond which may be substituted or unsubstituted, whereof about 11-60 mole % is a fluorine-substituted monofunctional hydrocarbon group, and m is 1.8-2.3), is a homogeneous paste, and cosmetic materials containing this paste-like silicone composition have good stability and are very easy-to-use.
This invention provides a cosmetic material wherein the above paste-like silicone composition is blended, or a cosmetic material comprising this cosmetic material as a component, comprising a) the above paste-like silicone composition, b) an oil and c) a compound having an alcoholic hydroxyl group in the molecular structure, wherein the blending amount of the a) paste-like silicone composition in the cosmetic material is 0.1-70.0 wt %.
At least part of this b) oil may be a liquid at ordinary temperature, and it is preferred that a
Millen White Zelano & Branigan P.C.
Moore Margaret G.
Shin-Etsu Chemical Co. , Ltd.
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