Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
1997-12-19
2001-02-06
Moore, Margaret G. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C424S401000, C424S059000, C424S063000, C424S064000
Reexamination Certificate
active
06184277
ABSTRACT:
The present invention relates to a composition for the care and/or treatment of the skin, including the scalp, and/or the lips of human beings, containing an organopolysiloxane gel as gelling agent. This composition can be employed in the cosmetics or dermatological field. More particularly, this composition is in the form of a homogeneous anhydrous gel containing one or more treating oils. In particular, this composition allows the hydration and the nutrition of the skin, providing it with suppleness and softness.
Anhydrous gels based on crosslinked elastomeric organosiloxane, as described in U.S. Pat. No. 4,789,169, are known to be products intended to be applied to the skin, exhibiting good cosmetic properties like softness, a matte appearance and a nongreasy feel.
Most homogeneous gels are obtained by swelling resins with oils of silicone character, such as linear polydimethylsiloxanes (PDMS) and cyclomethicones, or nonpolar oils such as volatile or nonvolatile derivatives of paraffin originating from petroleum oil, or synthetic ones such as perhydrosqualane.
Although they impart some properties to the skin (antidehydrating property via a protective action or by opposing imperceptible loss of water—ILW), these oils are not in any case “treating” the skin. This is because care oils are of vegetable origin and polar in nature, such as triglycerides.
Unfortunately, these polar oils are capable of being gelled with elastomeric silicones only with very great difficulty; the mixture is either unfeasible or, if it does form, is unstable with the passage of time and granular and opaque in appearance. In addition, when employed as they are, these oils are too fluid to be easily applied to the skin. Furthermore, they give the skin a greasy feel, which is not very comfortable, and a shiny appearance.
The subject-matter of the invention is a composition for the care and/or treatment of the skin and/or of the lips enabling these disadvantages to be overcome. Surprisingly, it has been found that the use of fluid alkyldimethicone, also called silicone oil with an alkyl chain, allows the polar treating oils to be made compatible with organopolysiloxane resins and to produce translucent, even transparent, stable gels enabling the treating oils to be conveyed without restriction and in a pleasant manner.
The invention applies not only to the products for the care and/or treatment of the skin, including the scalp and the mucosae such as the lips and the inside of the eyelids, but also to lip make-up products which have care and/or treatment properties, and to make-up products for the skin, both of the face and of the body, which have a care and/or treating function.
More precisely, the subject-matter of the invention is a composition containing at least one partially crosslinked elastomeric solid organopolysiloxane as gelling agent, associated with a fatty phase containing at least one polar oil and at least one cosolvent with a silicone structure comprising at least one alkyl chain which is pendent and/or at the end of a silicone structure, this chain being linear or branched and containing from 3 to 12 carbon atoms.
This composition can be employed as it is or else can be incorporated into a more complex composition.
“Elastomeric” is intended to mean a deformable, flexible material which has viscoelastic properties and which exhibits especially the consistency of a sponge or of a flexible sphere.
The elastomeric organopolysiloxanes of the composition according to the invention have a remarkable oil-gelling power. They are not desiccant to the skin and contribute good cosmetic properties. These new elastomers produce compositions which are comfortable to apply, soft and which do not feel sticky. This softness is due especially to the texture of the organopolysiloxanes.
In addition, by virtue of the presence of polar oil, these compositions have treating and/or care properties.
The composition of the invention may take the form of paste, solid or cream. It may be an oil-in-water or water-in-oil emulsion or a solid or flexible anhydrous gel. It preferably takes the form of translucent or transparent anhydrous gel.
The cosolvent(s) is/are advantageously volatile oils, that is to say oils capable of evaporating at ambient temperature, especially from the skin and/or the lips. In this case, after evaporation of the volatile oil or oils, the compositions of the invention produce a homogeneous and uniform film which has a texture that is light and imparting coolness, this being despite the presence of two initially incompatible materials.
The elastomeric organopolysiloxanes of the composition according to the invention are in general partially or completely crosslinked and three-dimensional in structure. When included in a fatty phase, they are transformed, depending on the fatty phase content employed, from a product of spongy appearance when they are employed in the presence of low contents of fatty phase, to a more or less homogeneous gel, in the presence of larger quantities of fatty phase. The gelling of the fatty phase by these elastomers may be complete or partial.
The elastomers of the composition of the invention are generally conveyed in the form of gel comprising an elastomeric organopolysiloxane of three-dimensional structure, included in at least one hydrocarbon oil and/or a silicone oil.
The elastomeric organopolysiloxanes of the composition according to the invention may be selected from the crosslinked polymers described in European application EP-A-0 295 886, the disclosure of which is specifically incorporated by reference herein. According to EP-A-0 295 886, these organopolysiloxanes are obtained by an addition and crosslinking reaction, in the presence of a catalyst of the platinum type, of at least:
(a) an organopolysiloxane containing at least two C
2
-C
6
lower alkenyl groups per molecule; and
(b) an organopolysiloxane containing at least two hydrogen atoms bonded to a silicon atom per molecule.
The elastomeric organopolysiloxanes of the composition according to the invention may also be chosen from those described in U.S. Pat. No. 5,266,321, the disclosure of which is specifically incorporated by reference herein. According to this patent, the organopolysiloxanes are selected especially from:
i) the organopolysiloxanes including R
2
SiO and RSiO
1.5
units and optionally R
3
SiO
0.5
and/or SiO
2
units in which the radicals R, independently of one another, denote a hydrogen, an alkyl such as methyl, ethyl or propyl, an aryl such as phenyl or tolyl or an unsaturated aliphatic group such as vinyl, the weight ratio of the R
2
SiO units to the RSiO
5
, units ranging from 1/1 to 30/1;
ii) the organopolysiloxanes which are insoluble and swellable in a silicone oil, obtained by addition of an organohydropolysiloxane (1) and of an organopolysiloxane (2) containing unsaturated aliphatic groups, such that the quantity of hydrogen or of unsaturated aliphatic groups in (1) and (2) respectively ranges from 1 to 20 mol % when the organopolysiloxane is noncyclic and from 1 to 50 mol % when the organopolysiloxane is cyclic.
The organopolysiloxanes which are the subject-matter of the invention are, for example, those marketed under the names KSG6 by Shin-Etsu, TREFIL E-505C or TREFIL E-506C by Dow-Corning, GRANSIL by Grant Industries (SR-CYC, SR DMF10, SR-DC556), or those marketed in the form of gels already formed (KSG15, K5G17, KSG16, K5G18 by Shin-Etsu, GRANSIL SR 5CYC gel, GRANSIL SR DMF 10 gel, GRANSIL SR DC 556 gel, SF 1204 and JK 113 by General Electric. A mixture of these commercial products may also be employed.
The organopolysiloxane(s) is/are preferably present, as active substance, in a concentration preferably ranging from 0.1 to 80% of the total weight of the composition, and more preferably from 2 to 60%.
The volatile silicones containing an alkyl chain preferably correspond to the following formula (1):
R
1
(CH
3
)
2
Si—O—{—Si—(CH
3
)R
2
—O—}
n
—{—Si—(CH
3
)
2
—O—}
m
—Si(CH
3
)
2
R
1
(1)
in which:
R
1
and R
2
independently represent hydr
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal
Moore Margaret G.
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