Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1998-10-23
2001-04-03
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S070100, C516S053000, C516S055000, C514S063000
Reexamination Certificate
active
06210690
ABSTRACT:
FIELD OF THE INVENTION
This invention relates in general to an emulsified composition, and more particularly to an water-in-oil type emulsified composition which gives gloss to hair or skin, is moist but not sticky and exhibits excellent stability.
BACKGROUND OF THE INVENTION
Silicone polymers are known to have superior water repellency, heat resistance and acid resistance and are frequently used in various industrial materials. In particular, they give gloss and have a refreshing texture without stickiness when used for cosmetic materials or quasi-drug materials and therefore they are used in various applications including skin care cosmetics, makeup cosmetics and hair cosmetics.
However, in order to obtain a stable emulsion, a surfactant or an organic modified clay mineral has to be blended in, and this deteriorates the non-sticking and refreshing feeling during use which is characteristic of silicone polymers, resulting in stickiness.
That is, it is difficult in terms of the emulsion stability to obtain a water-in-oil type emulsion by using only a silicone polymer for an emulsifier without additionally using a surfactant or an organic modified clay mineral. A solution for this problem is desired.
In order to solve this shortcoming, attempts have been made by, for example, using a polyether modified silicone for the emulsifier (Japanese examined patent publication Tokko Hei 5-32363) or by blending in various additives. However, this problem has not been solved up to this point.
The inventors conducted earnest investigation in view of the aforementioned problems and discovered that an emulsified composition which gives gloss to hair or skin, is moist but not sticky and exhibits excellent stability could be provided by using a water-in-oil type emulsion which contains high molecular weight polyether modified silicone with a specific polyoxyalkylene group content as a silicone polymer emulsifier and water soluble polymer, inorganic salt or amino acid salt for its stabilizer, thus completing the present invention.
The object of the present invention is to provide an emulsified composition which is moist but not sticky and exhibits excellent stability by using, for the emulsifier, polyether modified silicone rather than a surfactant or an organic modified clay mineral.
DISCLOSURE OF THE INVENTION
That is, the present invention provides an water-in-oil type emulsified composition containing one or more types chosen from among a group consisting of
(I) one or more types of polyether modified silicone represented by the following general formula [Chemical formula 1],
(II) oil,
(III) water or water and ethyl alcohol and
(IV) a water soluble polymer with a molecular weight of 2,000-300,000 whose content is 0.1-20 wt % of the total emulsified composition, 0.1-8 wt % inorganic salt or amino acid salt.
(In this formula, A denotes a group chosen from among a group consisting of a methyl group, phenyl group and a polyoxyalkylene group represented by the general formula —C
3
H
6
O(C
2
H
4
O)
a
(C
3
H
6
O)
b
R′ (where R′ denotes a group chosen from among a group consisting of a hydrogen atom, acyl group and alkyl group with a carbon number of 1-4, a denotes an integer 5-50 and b denotes an integer 5-50) and at least one of the three A's is an polyoxyalkylene. R denotes a methyl group or phenyl group, m denotes an integer 50-1,000 and n denotes an integer 1-40. The polyether modified silicone molecule contains 40 wt % or more of polyoxyalkylene groups and the molecular weight of the polyether modified silicone is 30,000 or more.)
The present invention also provides said waterin-oil type emulsified composition wherein said water soluble polymer is polyethylene glycol, said amino acid salt is sodium glutamate and said inorganic salt is sodium chloride, potassium chloride, magnesium chloride, calcium chloride, aluminum chloride, sodium sulfate, potassium sulfate, magnesium sulfate or aluminum sulfate.
The present invention also provides said waterin-oil type emulsified composition which contains hydrophobic powder.
The present invention also provides said waterin-oil type emulsified composition wherein said emulsified composition is a skin cosmetic.
The present invention also provides said waterin-oil type emulsified composition wherein said emulsified composition is a hair cosmetic.
BEST EMBODIMENTS OF THE INVENTION
The configuration of the present invention is described in detail below.
The polyether modified silicone used for the emulsifier in the present invention is organop olysiloxane containing polyoxyalkylene groups represented by the aforementioned [Chemical formula 1]. In the present invention, a commercial product (TS Polymer 50-IP from Toray Dow-Corning Silicone Co., Ltd.) can be used.
At least one of the three A's in the aforementioned [Chemical formula 1] of the polyether modified silicone has to be a polyoxyalkylene group represented by the general formula —C
3
H
6
O(C
2
H
4
O)
a
(C
3
H
6
O)
b
R′ and 40 wt % or more of polyoxyalkylene groups have to be contained in the polyether modified silicone molecules. Specific examples of the acyl group for R′ in the polyoxyalkylene group include a formyl group, acetyl group, propionyl group, butyroyl group, acryloyl group, benzoyl group and toluoyl group, and specific examples of the alkyl group with a carbon number of 1-4 include a methyl group, ethyl group, i-propyl group, n-propyl group, t-butyl group and n-butyl group. In the polyoxyalkylene group, if a or b is less than 5, then the polyether modified silicone will not exhibit a sufficient emulsifying effect. If a or b is more than 50, then the obtained emulsified composition will be sticky. The polyoxyalkylene group content is 40 wt % or more, and preferably in the range of 40-70 wt %. This is because the capability to emulsify nonpolar oil other than silicone oil decreases when the polyoxyalkylene group content is less than 40 wt %, and the obtained emulsified composition becomes sticky when it is more than 70 wt %. m is an integer 50-1,000 and n is an integer 1-40. This is because the emulsifying effect is not sufficient if m is less than 50 and n is less than 1, and the obtained emulsified composition becomes sticky if m is more than 1,000 and n is more than 40.
The molecular weight of the polyether modified silicone used in the present invention is 30,000 or more, and preferably 50,000 or more. This is because the capability to emulsify nonpolar oil other than silicone oil decreases when the molecular weight of the polyether modified silicone is less than 30,000.
The blend ratio of the polyether modified silicone used in the present invention is not limited in particular, but a preferable range is 0.1-30 wt %, and a more preferable range is 1-15 wt %. If the content of the polyether modified silicone is less than 0.1 wt % then stable emulsification becomes difficult and if it is more than 30 wt % then the emulsified composition may become sticky.
The oil ingredient used in the present invention is not limited in particular, and any oil which is used in emulsified compositions can be used. Examples of the silicone oil include diorgano polysiloxanes with low to high viscosity such as dimethyl polysiloxane, methylphenyl polysiloxane, methylhydrogen polysiloxane and dimethyl siloxane/methylphenyl polysiloxane copolymer, cyclic siloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane and tetramethyltetraphenyltetracyclosiloxane, cyclic siloxane solutions such as high polymer gum-like dimethyl polysiloxane, gum-like dimethylsiloxane/methylphenylsiloxane copolymer and gum-like dimethyl polysiloxane, diorgano polysiloxane containing alkyl groups with a carbon number of 6-50 such as trimethylsiloxy silicic acid and cyclic siloxane solutions of trimethylsiloxy silicic acid, and modified silicone oils such as amino modified silicone, alkyl modified silicone and perfluoroalkyl modified silicone. Examples of the non polar oil include hydrocarbon type oils such as squalane, liquid paraffin, light liquid paraffi
Nabeshima Hisaya
Nakama Yasunari
Omura Takayuki
Page Thurman K.
Pulliam Amy E
Shiseido Company Ltd.
Townsend & Banta
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