Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-12-08
2003-07-01
Dees, Jose G. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S061000, C424S064000, C514S844000, C514S845000
Reexamination Certificate
active
06585985
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a novel lipstick composition or, more particularly, to a lipstick composition capable of imparting the users thereof with a comfortable feeling of use and sustainedly exhibiting excellent effects of cosmetic finishing.
One of the serious defects in conventional lipsticks in general as applied to the lips is the poor sustainability of the cosmetic finishing therewith sometimes to cause contamination of clothes or blurry spreading of the lipstick color. Various proposals and attempts have been made heretofore in order to provide a solution for this problem. For example, a proposal is made for the formulation of a lipstick composition by compounding the composition with a vaporizable oil agent so that the oil agent in the coating layer of the lipstick on the lips is lost by evaporation leaving the coloring materials and the waxy ingredients alone on the surface of the lipstick-coating layer resulting in an improvement of the sustainability of the lipstick finishing effect. According to another proposal, the vaporizable oil agent is admixed with a film-forming ingredient such as a polymeric resin to form a polymeric film on the lip surface after evaporation of the oil agent from the lipstick coating layer contributing to the improvement of the sustainability of the cosmetic finishing with the lipstick.
In particular, proposals are made in Japanese Patent Kokai 1-168067, 7-267826, 8-225432, 9-48709, 9-48710, 9-71510, 9-143033, 9-143034, 10-36223 and 10-167930, according to which the lipstick composition is admixed with a silicone resin as a type of the above mentioned film-forming resinous ingredient. The silicone resins disclosed there, however, are each strongly water-repellent and solid at room temperature to exhibit strong adhesion to the lip surface and the lipstick compositions formulated therewith are unsatisfactory in respect of the warm-keeping behavior.
On the other hand, Japanese Patent Kokai 7-330547 discloses a method for improving the sustainability of the lipstick finishing by compounding the lipstick composition with a polyoxyalkylene-modified organopolysiloxane having hydrophilicity. This hydrophilic modified organopolysiloxane absorbs moisture from the lip surface to be imparted with an increased viscosity by means of which the sustainability of the lipstick finishing can be improved. The adhesion of this lipstick composition to the lip surface, however, is not high enough because the modified silicone is liquid at the human body temperature.
SUMMARY OF THE INVENTION
The present invention accordingly has an object, in view of the above described problems and disadvantages in the conventional lipstick compositions formulated with a film-forming resinous ingredient, to provide an improved lipstick composition used in the preparation of a lipstick which never imparts the user with a disordered feeling of use but gives a comfortable feeling and is capable of giving an excellently aesthetic cosmetic finishing effect with sustainability.
Thus, the lipstick composition provided by the present invention is a uniform blend which comprises:
(a) from 0.1 to 30% by weight of a crosslinked organopolysiloxane compound having at least one hydrophilic organic group in a molecule, which is insoluble in an organic solvent;
(b) from 10 to 90% by weight of an oily compound selected from the group consisting of liquid hydrocarbon compounds, esters, higher fatty acids, higher alcohols and silicone oils;
(c) from 5 to 50% by weight of an oil or fat which is solid or semisolid having a melting point of 25° C. or higher; and
(d) from 1 to 50% by weight of a pigment,
the balance to 100%, if any, being constituted of substances permissible as an ingredient in a cosmetic preparation.
In particular, the hydrophilic crosslinked organopolysiloxane as the component (a) is a reaction product between an organohydrogenpolysiloxane represented by the average unit formula
R
a
H
b
SiO
(4-a-b)/2
, (I)
in which R is an optionally halogenated monovalent hydrocarbon group selected from the group consisting of alkyl groups having 1 to 8 carbon atoms, allyl group, aryl groups and aralkyl groups, the subscript a is a positive number in the range from 1.0 to 2.5 and the subscript b is a positive number in the range from 0.001 to 1.0 with the proviso that a+b is a positive number in the range from 1.5 to 2.8, and an alkenyl-terminated polyoxyalkylene compound represented by the general formula
C
m
H
2m-1
O(C
2
H
4
O)
x
(C
3
H
6
O)
y
C
m
H
2m-1
, (II)
in which the subscript x is a positive integer in the range from 2 to 200, the subscript y is 0 or a positive integer not exceeding 200 with the proviso that x+y is a positive integer in the range from 3 to 200 and the subscript m is a positive integer in the range from 2 to 6.
It is preferable that from 5 to 30% by moles of the groups denoted by R in the average unit formula (1) are optionally halogenated monovalent hydrocarbon groups having 6 to 30 carbon atoms, the balance to 100% being methyl groups.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The above described unique formulation of the inventive lipstick composition has been established on the base of the unexpected findings of the inventors that, when a lipstick composition is compounded with a hydrophilic crosslinked organopolysiloxane compound, this organopolysiloxane compound in the coating layer on the lip surface absorbs moisture from the lip surface to be imparted with an increased viscosity and to exhibit a gel-like consistency and rubbery elasticity so that the layer of the lipstick composition adhesively coating the lip surface can smoothly follow the movement of the lips and the sustainability of the lipstick finishing can be greatly improved without adversely affecting the desirable properties obtained by the formulation with a hydrophilic organopolysiloxane compound.
In the hydrophilic crosslinked organopolysiloxane compound as the component (a) of the inventive lipstick composition, the hydrophilic organic group can be selected from a wide variety of known hydrophilic groups including polyoxyethylene groups, poly(oxyethyleneoxypropylene) copolymeric groups, polyvinylpyrrolidone groups, acrylic acid group, methacrylic acid group, phosphoric acid groups, polyoxyethylene phosphate ester groups and quaternary ammonium-substituted alkyl groups, though not particularly limited thereto.
While the hydrophilic crosslinked organopolysiloxane compound as the component (a) must be insoluble in or not freely miscible with an organic solvent, the organic solvent used in this insolubility test is exemplified by aliphatic hydrocarbon solvents having a straighty linear or branched molecular structure such as pentane, hexane, decane, hexadecane and octadecane, aromatic hydrocarbon solvents such as benzene, toluene and xylene, alcoholic solvents such as methanol, ethanol, propanol, butanol, haxanol and decanol, halogenated hydrocarbon solvents such as chloroform and carbon tetrachloride and ketone solvents such as acetone and methyl ethyl ketone.
The hydrophilic crosslinked organopolysiloxane can be prepared by several different methods, each of which is known in the art of silicone chemistry, including:
(1) the hydrosilation addition reaction between an organohydrogenpolysiloxane and a polyoxyalkylene compound terminated at each molecular chain end with an aliphatically unsaturated group;
(2) the radical copolymerization reaction of an organopolysiloxane having a radical-polymerizable group and a hydrophilic polymer having a radical-reactive group;
(3) the hydrosilation addition reaction between an organohydrogenpolysiloxane and a polyoxyalkylene diacryloyl ester compound;
(4) the addition reaction between an amino-modified organopolysiloxane and a polyoxyalkylene diglycidyl ether;
(5) the condensation reaction between a carboxylic acid-modified organopolysiloxane and a polyoxyalkyleneglycol; and
(6) the hydrosilation addition reaction between a polyoxyalkylene-modified organohydrogenpolysiloxane and a vinyl gr
Dees Jos,e G.
Millen White Zelano & Branigan P.C.
Shin-Etsu Chemical Co. , Ltd.
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