Drug – bio-affecting and body treating compositions – Topical body preparation containing solid synthetic organic... – Skin cosmetic coating
Reexamination Certificate
2000-03-30
2002-07-16
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Topical body preparation containing solid synthetic organic...
Skin cosmetic coating
C424S401000, C424S063000, C424S061000, C424S059000, C424S065000, C424S064000, C424S069000, C424S070100
Reexamination Certificate
active
06419912
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a composition for caring for and/or making up the skin and/or lips of human beings exhibiting both hypoallergenic and freshness properties. This composition is in particular a care cream, an eyeliner, a face powder, an eyeshadow, a foundation or alternatively an antisun product, a deodorant cream or a conditioner. It is provided in the form of a more or less thick, water-in-oil, oil-in-water-in-oil or water-in-oil-in-water emulsion. The invention also relates to the use of particles of a specific organopolysiloxane in a hypoallergenic composition for the skin or lips.
Description of the Background
Water-in-oil (W/O) emulsions exhibit the disadvantage, with respect to an oil-in-water (O/W) emulsion, of comprising only a small amount of water and therefore contributing only a small degree of freshness to the skin or lips to which they are applied.
Furthermore, they often confer a greasy and glistening appearance on the skin, which does not allow them to be used or allows them to be used with difficulty in hot and humid environments and/or by users with greasy skin.
Furthermore, in order to disperse or emulsify the aqueous phase in the liquid fatty phase, it is necessary to use a certain amount of surfactants, which surfactants are often irritating and poorly tolerated by people with sensitive skin and can even lead to allergenic reactions.
The need therefore remains for a nongreasy hypoallergenic composition at the same time exhibiting freshness properties.
SUMMARY OF THE INVENTION
The Inventor has found, surprisingly, that it is possible, by using specific crosslinked organopolysiloxanes as sole emulsifier, to form hypoallergenic compositions comprising a W/O emulsion which are devoid of surfactant and which comprise a large amount of water.
Although there exist compounds of the crosslinked organopolysiloxane type which disperse in an aqueous medium, such as, for example, the compounds of KSG 20 or KSG 21 type sold by Shin Etsu, the specific chemical structure of which (cf. U.S. Pat. No. 5,236,986 of Shin Etsu) is responsible for the dispersion in an aqueous medium (presence of polar groups conferring surfactant properties on them), these compounds, in contrast to those of the composition of the invention, are not capable of emulsifying a large amount of water (namely, up to 70% by weight of water). They therefore do not allow freshness to be contributed, like the organopolysiloxanes of the composition according to the present invention.
A specific subject-matter of the present invention is a composition for caring for or making up the skin or lips of human beings which overcomes the various disadvantages mentioned above and which provides a make-up or a care product which exhibits improved cosmetic properties with respect to those of the products of the prior art, in particular properties of freshness, of slip and of non-drying of the skin and lips, without contributing greasiness, and which additionally exhibits properties of hypoallergenicity and of nonirritation of the skin and lips.
The invention applies not only to products for making up the lips and skin of human beings but also to products for caring for and/or treating human lips and skin, including the scalp.
Thus, the present invention provides a hypoallergenic composition suitable as a make up or care agent for keratinous substances, comprising:
an aqueous phase,
a liquid fatty phase, and
particles of a crosslinked solid elastomeric organopolysiloxane comprising at least one oxyalkylene group,
wherein
the aqueous phase is dispersed in the liquid fatty phase, and
the composition is devoid of cosurfactant.
The present invention also provides a method of preparing the inventive composition, comprising mixing the aqueous phase, liquid fatty phase, and particles of a crosslinked solid elastomeric organopolysiloxane comprising at least one oxyalkylene group.
The present invention also provides a method of treating skin, comprising applying the inventive composition to the skin.
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description.
DETAILED DESCRIPTION OF THE INVENTION
The term “cosurfactant” refers any amphiphilic compound capable of emulsifying an aqueous phase in a liquid fatty phase which has an HLB (hydrophile/lipophile balance) value of less than 6. The composition according to the invention preferably comprises less than 0.01% of cosurfactant.
The invention also relates to the use of particles of crosslinked elastomeric solid organopolysiloxane comprising at least one oxyalkylenated and more especially oxyethylenated group in a hypoallergenic and fresh care or make-up composition or for the manufacture of a hypoallergenic and fresh care or make-up composition or for sensitive and/or reactive skin and/or lips. In particular, this composition comprises an aqueous phase dispersion in a liquid fatty phase.
The term “elastomeric” refers to a flexible and deformable material having viscoelastic properties and in particular the consistency of a sponge or of a flexible sphere. Its modulus of elasticity is such that this material is resistant to deformation and has a limited ability to expand and to contract. This material is capable of returning to its original shape after it has been stretched. This elastomer is formed of polymeric chains of high molecular weight, the mobility of which is limited by a uniform network of crosslinking points.
The organopolysiloxanes of the composition of the invention comprise one or more oxyalkylene and in particular oxyethylene (OE) groups, for example from 1 to 40 oxyalkylene units, preferably from 1 to 20 and better still from 12 to 20 oxyalkylene units, which can form polyoxyalkylene and in particular polyoxyethylene chains. These groups can be pendant, at the chain end or intended to connect two parts of the silicone structure. The silicon atoms carrying these groups, indeed even these chains, advantageously number from 1 to 10 and better still from 1 to 6.
Although the invention relates more especially to organopolysiloxanes comprising oxyethylene groups(s) (namely, only comprising oxyethylene groups as oxyalkylene groups), it can also relate to organopolysiloxanes comprising oxypropylene group(s), that is to say only comprising oxypropylene groups as oxyalkylene groups. The organopolysiloxanes can also comprise both one or more oxyethylene (OE) group(s), for example 1 to 20, and one or more oxypropylene (OP) group(s), for example 0 to 20; these organopolysiloxanes are also known as organopolysiloxanes comprising alkylethoxy-propylene group(s). The number of oxyethylene groups is preferably greater than the number of oxypropylene groups.
Furthermore, the silicone structure forming the polymeric backbone of the organopolysiloxane comprising oxyalkylene group(s) is advantageously a polydimethylsiloxane (PDMS) structure, a portion of the methyl groups of which is optionally substituted by C
2
to C
30
and preferably C
8
to C
24
and better still from C
10
to C
20
alkyl groups or phenyl groups, either at the chain end or at pendant positions.
Furthermore, the organopolysiloxane comprising oxyalkylene group(s) can comprise one or more silicone backbone(s) connected to one another by one or more oxyalkylene and preferably oxyethylene groups as defined above or by one or more alkylene groups, the alkylene group number ranging from 1 to 20 and preferably from 1 to 10. The organopolysiloxane preferably comprises at least two polymeric backbones connected to one another.
The silicone backbone or backbones of these organopolysiloxanes of the composition according to the invention advantageously comprise from 26 to 80 silicon atoms.
The elastomeric organopolysiloxanes of the composition of the invention exhibit a notable ability to thicken a liquid fatty phase and to emulsify an aqueous phase in a liquid fatty phase; they swell in the liquid fatty phase. They
Di Nola-Baron Liliana
L'Oreal
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Page Thurman K.
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