Drug – bio-affecting and body treating compositions – Live skin colorant containing – Lip
Reexamination Certificate
1998-09-30
2001-07-10
Dudash, Diana (Department: 1619)
Drug, bio-affecting and body treating compositions
Live skin colorant containing
Lip
C424S059000, C424S063000, C424S401000, C514S845000, C514S846000
Reexamination Certificate
active
06258345
ABSTRACT:
The invention relates to a stable topical composition comprising a liquid fatty phase in combination with a partially or completely crosslinked elastomeric organopolysiloxane. This composition is more especially intended for the cosmetic or dermatological field. It can constitute in particular a composition for caring for, treating, making up or removing make-up from the skin of the face or of the body, keratinous fibres (hair, eyelashes, eyebrows) and mucous membranes, such as the lips and the inner surfaces of the eyelids, of human beings.
It is known to use, in cosmetic or dermatological compositions, spherical particles, such as silica particles, for the purpose of conferring a degree of consistency on these compositions. Reference may in particular be made to the document by Shiseido EP-A-765,656. In these compositions, the higher the amount of particles, the thicker the composition. In addition, these particles have the property of absorbing fatty substances, and conferring a non-greasy appearance on these compositions, even in the presence of a large amount of fatty substances. This type of composition is much appreciated by consumers, in particular those with a skin with a greasy tendency. Unfortunately, the higher the amount of silica particles, the greater the instability of the composition. In addition, these particles confer a very rough and dry feel on the composition, thus limiting the use of this type of composition.
The inventors have developed a stable composition with a high level of spherical particles which does not exhibit the above disadvantages, while retaining the non-greasy property.
More specifically, the invention relates to a composition comprising at least one liquid fatty phase associated with a solid phase comprising particles of at least one partially or completely crosslinked elastomeric organopolysiloxane, wherein the particles in the solid phase represent at least 10% of the total weight of the fatty phase and, in addition, the composition comprises spherical organic particles with a particle diameter of less than 10 &mgr;m.
Another subject-matter of the invention is the use, in a composition comprising at least one liquid fatty phase associated with solid phase containing particles and further comprising spherical organic particle with a particle diameter of less than 10 &mgr;m, the particles in the solid phase representing at least 10% of the total weight of the fatty phase, of particles of one or more partially or completely crosslinked elastomeric organopolysiloxanes, in order to stabilize and/or to render homogeneous the said composition.
A further subject-matter of the invention is a process for the stabilization and/or homogenization of a composition comprising at least one liquid fatty phase associated with a solid phase containing particles, the particles in the solid phase representing at least 10% of the total weight of the fatty phase and further comprising spherical particles with a particle diameter of less than 10 &mgr;m, which process comprises using particles of at least one partially or completely crosslinked elastomeric organopolysiloxane in the solid phase.
By virtue of the presence of one or more solid elastomeric organopolysiloxanes, it is possible to obtain stable compositions comprising a high amount of spherical organic particles which can represent up to 40% by weight (as active material) of the total fatty phase.
“Stable composition” should be understood as meaning maintenance of the homogeneous appearance of the composition, without demixing, precipitation or flocculation of the particles, for at least 2 months at 45° C. “Elastomeric” is understood to mean a flexible and deformable material having viscoelastic properties and exhibiting in particular the consistency of a sponge or of a flexible sphere.
“Liquid fatty phase” should be understood as meaning a fatty phase which is liquid at room temperature, often known as oily phase.
According to the invention, it is additionally possible to combine, with the liquid fatty phase, a fatty phase which is solid or semi-solid at room temperature, for the purpose of modifying the rheology of the composition.
Although the invention applies to any technical field, it is intended more especially for the cosmetic and dermatological fields. The composition of the invention is well suited to topical application.
The elastomeric organopolysiloxanes of the composition according to the invention exhibit a notable oil-gelling power. They are not desiccating to the skin and contribute good cosmetic properties. These novel elastomers result in compositions which are comfortable on application, soft and nonsticky to the touch. This softness is due in particular to the texture of the organopolysiloxanes.
The combination of the invention also makes it possible to obtain care or make-up products intended in particular for softening blemishes of the contours of the skin, while contributing a natural appearance to it.
Preferably, the spherical organic particles have a particle diameter of less than 5 &mgr;m. Particle diameter should be understood as meaning the diameter of the unit particles. This is because the spherical particles may have a tendency to agglomerate, resulting in aggregates which can have particle diameters of greater than 5 &mgr;m, or even greater than 10 &mgr;m.
In particular, representative spherical organic particles to which the invention applies are polymeric particles chosen from microbeads of methylsilsesquioxane resins, such as, for example, those sold by Toshiba Silicone under the name Tospearl 145A®, microbeads of poly(methyl methacrylate)s, such as in particular those sold by Seppic under the name Micropearl M 100®, spherical particles of crosslinked polydimethylsiloxanes, such as in particular those sold by Dow Corning Toray Silicone under the name Trefil E 506 C® or Trefil E-505C®, spherical particles of polyamide and more especially of Nylon 12, such as in particular those sold by Atochem under the name Orgasol 2002 D Nat C05®, polystyrene microspheres, such as, for example, those sold by Dyno Particles under the name Dynospheres®, and their mixtures.
The “Trefils” are in particular spherical particles of crosslinked polymers disclosed in Application EP-A-0,295,886 of Toray Silicone Company. According to this application, they are obtained by addition and crosslinking reaction, in the presence of a catalyst of the platinum type, of at least:
(a) one organopolysiloxane having at least two lower alkenyl groups per molecule; and
(b) one organopolysiloxane having at least two hydrogen atoms bonded to a silicon atom per molecule.
The elastomeric organopolysiloxanes of the composition of the invention exhibit a three-dimensional structure. Depending on the level of the liquid fatty phase used in combination with these organopolysiloxanes, the latter are converted from a product with a spongy appearance, when they are used in the presence of low contents of fatty phase, to a more or less homogeneous gel, in the presence of larger amounts of fatty phase. The gelling of the liquid fatty phase by these elastomers can be complete or partial.
The elastomers of the composition of the invention are generally carried in the form of a gel composed of an elastomeric organopolysiloxane with a three-dimensional structure included in at least one hydrocarbon-comprising oil and/or one silicone oil.
The elastomeric organopolysiloxanes of the composition according to the invention can also be chosen from those disclosed in U.S. Pat. No. 5,266,321 of Kobayashi Kose, the disclosure of which is specifically incorporated by reference herein. According to this patent, they are chosen in particular from:
i) organopolysiloxanes comprising R
2
SiO and RSiO
1.5
units and optionally R
3
SiO
0.5
and/or SiO
2
units in which the R radicals, independently of one another, represent 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 ratio by weight of the R
2
SiO units to the RSiO
1.5
units ranging from
Contamin Jean-Claude
Rouquet Violaine
Berman Alysia
Dudash Diana
L'Oreal (S.A.)
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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