Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-10-10
2002-05-28
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S059000, C424S060000, C424S400000, C424S401000
Reexamination Certificate
active
06395285
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present application relates to an anhydrous composition comprising, in a fatty phase, at least one crosslinked elastomeric solid polyorganosiloxane and at least one volatile fluoro oil with a density of greater than 1, and to the use of the composition, in particular, in cosmetics for treating, protecting, caring for, removing make-up from and/or cleansing the skin, the lips and/or the hair, and/or for making up the skin and/or the lips.
2. Description of the Background
Anhydrous compositions constitute excellent cosmetic or dermatological supports, in particular, as vehicles for active agents. These compositions thus make it possible to form a lipid film at the surface of the skin, which prevents transepidermal water loss and protects the skin against external attack. However, these compositions have the drawback of lacking in comfort and cosmetic pleasantness since, because of the absence of water, they lack a fresh sensation and appear particularly heavy and uncomfortable, even when they do not contain any nourishing oils known to give a greasy effect.
In order to overcome this disadvantage, the known practice has been to incorporate gels based on crosslinked elastomeric organosiloxanes, such as those described in U.S. Pat. No. 4,987,168, into anhydrous compositions. These gels improve the cosmetic qualities of these compositions, in particular by providing softness, a matt effect and a less greasy feel.
However, although the compositions obtained appear to be less greasy, they lack a fresh sensation when they are applied to the skin. A need continues to exist for anhydrous compositions for topical application which provide for an increased fresh and soft feeling when applied to the skin.
SUMMARY OF THE INVENTION
Accordingly, one object of the present invention is to provide an anhydrous composition for topical application which results in an improved feeling of freshness and softness upon application to the skin.
Briefly, this object and other objects of the present invention as hereinafter will become more readily apparent can be attained by an anhydrous composition which comprises, in a fatty phase, at least one elastomeric solid polyorganosiloxane which is at least partially cross-linked and at least one volatile fluoro oil having a density of greater than 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
It has now been discovered, unexpectedly, that the use of a volatile fluoro oil with a density of greater than 1 in an anhydrous composition allows the preparation of anhydrous compositions which have very good cosmetic properties and which provide a sensation of freshness and comfort when they are applied to the skin, which is not obtained with the compositions known in the art.
The term “fatty phase” as used in the present text means a phase comprising fatty substances and in particular oils.
According to the invention, the density of the volatile fluoro oil component of the composition is generally greater than about 1.1 and preferably greater than 1.2.
The expression “volatile fluoro oil” should be understood as meaning an oil having, at 25° C., a saturating vapor pressure at least equal to 50 Pa.
Suitable volatile fluoro oils which satisfy the above density and vapor pressure criteria include the following fluoro compounds:
1) perfluorocycloalkyls having formula (I) below:
in which n is 4 or 5, m is 1 or 2, and p is 1, 2 or 3, with the proviso that, when m=2, the groups are not necessarily alpha to each other;
2) perfluoroalkanes having formula (II) below:
CF
3
—(CF
2
)
m
—CF
2
X (II)
in which m is 2 to 8, and X represents Br or F;
3) fluoroalkyls or heterofluoroalkyls having formula (III) below:
CH
3
—(CH
2
)
n
—[Z]
t
—(CF
2
)
m
—CF
3
(III)
in which t is 0 or 1, n is 0, 1, 2 or 3, m is 2, 3, 4 or 5, and Z is O, S or NR, wherein R is hydrogen or a —(CH
2
)
p
—CH
3
group or a —(CF
2
)
p
—CF
3
group, wherein p is 2, 3, 4 or 5; and
4) perfluoromorpholine derivatives having formula (IV) below:
in which R is a C
1
-C
4
perfluoroalkyl radical.
Suitable perfluorocycloalkyl compounds of formula (I) include, in particular, perfluoromethylcyclopentane and perfluoro-1,3-dimethylcyclohexane, which are sold under the names “Flutec PC1®” and “Flutec PC3®” by the company BNFL Fluorochemicals Ltd., which have respective densities of 1.26 and 1.82, as well as perfluoro-1,2-dimethylcyclobutane.
Suitable perfluoroalkane compounds of formula (II) include, inter alia, dodecafluoropentane and tetradecafluorohexane, which are sold under the names “PF 5050®” and “PF 5060®” by the company 3M and which have respective densities of 1.63 and 1.68, or alternatively bromoperfluorooctyl sold under the name “Foralkyl®” by the company Atochem, which has a density of 1.95.
Suitable fluoro compounds of formula (III) include, for example, nonafluoromethoxybutane, sold under the name “MSX 4518®” by the company 3M, which has a density of 1.53, and nonafluoroethoxyisobutane, which has a density of 1.43.
Finally, suitable perfluoromorpholine derivatives include, for example, 4-trifluoromethylperfluoromorpholine, sold by the company 3M under the name “PF 5052®”, with a density equal to 1.7.
The fluoro compounds as described above are moreover characterized by a boiling point generally ranging from 25 and 65° C.
The amount of volatile fluoro oil in the composition of the invention can vary over a wide range and generally ranges from 0.5% to 60%, preferably from 5% to 50% by weight relative to the total weight of the composition.
The composition of the invention contains at least one at least partially crosslinked elastomeric solid polyorganosiloxane. The term “elastomer” means a flexible, deformable material which has viscoelastic properties and in particular the consistency of a sponge or a supple sphere. Its modulus of elasticity is such that this material withstands deformation and has a limited capacity to extension and contraction. This material is capable of regaining its original shape after it has been stretched. This elastomer is formed from high molecular weight polymer chains whose mobility is limited by a uniform network of crosslinking points.
The elastomeric polyorganosiloxanes used in the composition of the invention are partially or totally crosslinked. When included in an oily phase, they become transformed, depending on the amount of oily phase used, from a product of spongy appearance when they are used in the presence of small amounts of oily phase, into a homogeneous gel in the presence of larger amounts of oily phase. The gelation of the oily phase with these elastomers may be total or partial.
The elastomers of the invention can be conveyed in the form of a gel consisting of an elastomeric polyorganosiloxane, including at least one hydrocarbon-based oil and/or one silicone oil and/or one fluoro oil. Thus, the oily phase associated with the elastomeric polyorganosiloxane can consist of this or these oils.
The elastomeric polyorganosiloxanes used in the invention can be selected from the crosslinked polymers described in European Patent Application Number 0 295 886. According to the application, the elastomeric polyorganosiloxanes are prepared by addition reactions and crosslinking, in the presence of a platinum-type catalyst, of at least:
(a) one polyorganosiloxane containing at least two lower alkenyl groups per molecule, these alkenyl groups containing two to six carbon atoms; and
(b) one polyorganosiloxane containing at least two hydrogen atoms linked to a silicon atom per molecule.
The elastomeric polyorganosiloxanes used in the composition of the invention can also be selected from those described in U.S. Pat. No. 5,266,321. According to the patent, the elastomeric polyorganosiloxanes are selected, in particular, from:
i) polyorganosiloxanes comprising 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 each other, represent hydrogen, an alkyl radical such as methyl, ethyl or propyl,
Dodson Shelley A.
L'Oreal
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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