Dermatic cosmetic material

Details Dermatic cosmetic material Dermatic cosmetic material

2000-06-23

2003-01-07

Krass, Frederick (Department: 1614)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Cosmetic, antiperspirant, dentifrice

C424S065000, C424S066000, C424S067000, C424S068000, C514S770000, C514S827000, C514S828000, C514S938000

Reexamination Certificate

active

06503519

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a dermatic cosmetic material in which is mixed a paste composition comprising a three-dimensionally cross-linked silicone polymer and a silicone oil. In particular, the invention is concerned with an antiperspirant composition having characteristics that, when applied to the skin, it has neither tacky feel nor oily feel, spreads smoothly and provides a refreshing feeling to the skin, wherein are comprised an aluminum compound having an antiperspirant activity and the aforementioned paste composition. Further, the invention relates to a skin-care cosmetic material in which vitamin C is dispersed homogeneously in a stable condition owing to the incorporation of the aforementioned paste composition.
BACKGROUND OF THE INVENTION
Many antiperspirant cosmetics containing aluminum compounds as an active component in perspiration control are available. The antiperspirant compositions are used in any form of nonaqueous or aqueous liquid, solid and spray compositions.
In a case of nonaqueous liquid compositions, the foregoing active component is dispersed in oily ingredients; therefore such compositions have an oily feel. In addition, it is required to give them a good shake before their use because they cause sedimentation of the active component upon storage. Further, they have a drawback of tending to trickle down from the part to which they are applied. Then silicone oils are used as a dispersion medium for the active component with the intention of decreasing an oily feel. However, this measure cannot by itself get rid of the tendencies of the resultant compositions to deposit the active component upon storage and trickle down from the applied parts.
In another case of mixing waxy ingredients in a nonaqueous composition and forming the mixture into solid composition sticks, the sticks have a tacky feel arising from the waxy ingredients. Such a tacky feel is difficult to eliminate even when silicone oils are employed as oily ingredients. In still another case of mixing a clay mineral as thickener, e.g., montmorillonite, in a nonaqueous composition and making the resultant mixture into the creamy or gelled composition, this creamy or gelled composition cannot be rid of the tacky feel caused by the thickener. For instance, the stick composition utilizing dibenzylidene sorbitol as a gelling agent and propylene glycol as a dispersion medium has a very tacky feel. Even if it is attempted to mix silicone oils as a texture improver in the foregoing composition, the silicone oils cannot be dispersed homogeneously therein.
On the other hand, aqueous liquid compositions are prepared by dispersing the active component into water or a water-alcohol mixture. As the active component can be dissolved homogeneously in the dispersion medium, the sedimentation thereof can be prevented from occurring upon storage. However, the compositions still tend to trickle down from the applied parts.
While the aqueous compositions can be converted into creamy or gelled compositions by the use of a polyacrylic acid salt as a thickener, they are similar in drawback of having a tacky feel arising from the thickener to the foregoing nonaqueous compositions. So it has been attempted to convert the aqueous compositions into creamy compositions of oil-in-water or water-in-oil type by the use of emulsifiers. However, those compositions also have an irritant or tacky feel originating in the emulsifiers.
In the case where it is intended that various vitamins be compounded in cosmetic materials for the purpose of furnishing nutrition to the skin, water-soluble vitamin C is difficult to disperse homogeneously into the cosmetic materials in a stabilized condition. This is because the water solution of vitamin C is liable to undergo oxidative decomposition, and so it is inferior in storage stability. Even when such cosmetic materials are prepared as emulsions of oil-in-water or water-in-oil type, their storage stability problem cannot be resolved. Therefore, cases are known where the cosmetic materials are prepared as nonaqueous compositions whose dispersion medium is alcohol. When the silicone oils as texture improver are added to such compositions, however, it is difficult to obtain homogeneous dispersions.
SUMMARY OF THE INVENTION
Therefore, a first object of the invention is to provide dermatic cosmetic materials, including antiperspirant compositions in a gel state, particularly an antiperspirant composition of emulsifier-free emulsion type, which have no tacky feel arising from a thickener whether the compositions are aqueous or nonaqueous, and create comfortable feelings when applied to the skin.
A second object of the invention is to provide nonaqueous dermatic cosmetic materials of homogeneous paste type, including a vitamin C-containing skin-care cosmetic material, which contain a lower alcohol and a silicone oil as a dispersion medium and has high storage stability.
As a result of our intensive studies for attaining the aforementioned objects, it has been found that the antiperspirant composition giving a comfortable feeling to the applied skin and the vitamin C-containing skin-care composition having high storage stability can be obtained by using as a substrate a silicone composition paste comprising (i) a silicone polymer having hydrophilic polyoxyalkylene groups, wherein polyoxyethylene moieties are comprised, and a cross-linked structure and (ii) a silicone oil, thereby achieving the present invention.
Namely, the present invention provides a dermatic cosmetic material containing as a substrate a silicone composition paste comprising a silicone oil and a cross-linked silicone polymer having hydrophilic polyoxyalkylene groups in which polyoxyethylene moieties are comprised.
DETAILED DESCRIPTION OF THE INVENTION
The present silicone composition paste is a composition prepared by dispersing homogeneously in a silicone oil a cross-linked silicone polymer having hydrophilic polyoxyalkylene groups which is produced by addition polymerization reaction between an organohydrogenpolysiloxane and a compound having terminal aliphatic unsaturated groups. The organohydrogenpolysiloxane usable in this addition polymerization reaction is a hydrophilic polyoxyalkylene group-containing organohydrogenpolysiloxane represented by formula,
R
1
a
R
2
b
H
c
SiO
(4−a−b)/2
  (1),
an organohydrogenpblysiloxane represented by formula,
R
1
j
H
k
SiO
(4−j−k)/2
  (2),
or a mixture of these organohydrogenpolysiloxanes; while the compound having terminal aliphatic unsaturated groups usable in this addition polymerization reaction is a polyalkylene oxide represented by formula,
C
m
H
2m−1
(C
2
H
4
O)
p
(C
3
H
6
O)
q
C
m
H
2m−1
  (A),
an organopolysiloxane represented by formula,
R
1
d
R
3
e
SiO
(4−d−e)/2
  (B),
or a mixture of these compounds. Moreover, at least either the organohydrogenpolysiloxane represented by formula (1) or the polyalkylene oxide represented by formula (A) is the essential component in the aforementioned addition polymerization reaction. In those formulae, R
1
represents an alkyl group containing 1 to 18 carbon atoms, an aryl group, an aralkyl group or a monovalent halogenated hydrocarbon group; R
2
represents an organic group represented by —C
n
H
2n
O(C
2
H
4
O)
f
(C
3
H
6
O)
g
R
4
; R
3
represents a monovalent 2-10C hydrocarbon group having a terminal vinyl group; R
4
represents a hydrogen atom, a 1-10C saturated organic group, or a group represented by —CO—R
5
; R
5
represents a 1-5C saturated organic group; 1.0≦a≦2.5, 0.001≦b≦1.0, 0.001≦c≦1.0, 1.0≦d≦3.0, 0.001≦e≦1.5, 1.0≦j≦3.0, 0.001≦k≦1.5; f and p are each an integer of from 2 to 200; g and q are each an integer of from 0 to 200; and m and n are each an integer of from 2 to 6. More specifically, the present silicone composition paste includes the silicone composition disclosed in Japanese Tokkai Hei 4-272932 (the term “Tokkai” as used herein means an “unexamined published patent

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