Drug – bio-affecting and body treating compositions – Inorganic active ingredient containing – Elemental sulfur or compound thereof
Reexamination Certificate
2002-07-16
2004-09-21
Venkat, Jyosthna (Department: 1615)
Drug, bio-affecting and body treating compositions
Inorganic active ingredient containing
Elemental sulfur or compound thereof
C424S401000
Reexamination Certificate
active
06793940
ABSTRACT:
The present invention relates to a composition for coating keratin fibers comprising comprising at least one dispersion of multiphase particules. The invention also relates to the use of this composition for making up keratin fibers, as well as to a process for making up these fibers. The composition and the makeup process according to the invention are more particularly intended for substantially longilinear human keratin fibers such as the eyelashes, the eyebrows and the hair, including false eyelashes and hairpieces. The composition can be a makeup composition, a makeup base, a composition to be applied to a makeup, also known as a top-coat, or alternatively a composition for cosmetically treating keratin fibers. More especially, the invention relates to a mascara.
Compositions for coating the eyelashes, known as mascara, generally comprise, in a known manner, at least one wax and at least one film-forming polymer to deposit a makeup film on the eyelashes and coat them, for example as described in document WO-A-95/15741. Users expect these products to have good cosmetic properties, such as adhesion to the eyelashes, lengthening or curling of the eyelashes, or alternatively good staying power of the mascara over time, in particular good resistance to rubbing, for example with the fingers or fabrics (handkerchiefs, towels). However, mascara compositions do not always allow good curling of the eyelashes to be obtained.
The aim of the present invention is to provide a composition for making up keratin fibers, and in particular the eyelashes, which applies easily and gives good curling of the keratin fibers.
It has been discovered that such a composition can be obtained by using a particle dispersion of particular multiphase particles, in a cosmetically acceptable medium.
The composition according to the invention applies easily and attaches well to keratin fibers such as the eyelashes. It is found that the eyelashes are curled quickly and easily after applying the composition thereto. The makeup is comfortable for the user to wear. The makeup is easily removed with standard makeup removers.
More specifically, a subject of the invention is a composition for coating keratin fibers, comprising a dispersion of multiphase particles in a cosmetically acceptable medium, the multiphase particles comprising at least one supple phase at least on the outside, comprising at least one supple polymer having at least one glass transition temperature of less than or equal to 60° C. and at least one rigid phase at least on the inside, the rigid phase being an amorphous material having at least one glass transition temperature of greater than 60° C., the supple polymer being at least partially attached by chemical grafting onto the rigid phase.
A subject of the invention is also a process for coating keratin fibers, especially the eyelashes, comprising the application to the keratin fibers of a composition as defined above.
A subject of the invention is also the use of a composition as defined above for curling the eyelashes.
A subject of the invention is also the use, in a mascara composition, of a dispersion of multiphase particles comprising at least one supple phase at least on the inside, comprising at least one supple polymer having at least one glass transition temperature of less than or equal to 60° C., and at least one rigid phase at least on the outside, the rigid phase being an amorphous material having at least one glass transition temperature of greater than 60° C., the supple polymer being at least partially attached by chemical grafting onto the rigid phase, the multiphase particles being dispersed in a cosmetically acceptable medium, to curl the eyelashes.
The glass transition temperature corresponds to the temperature at which the amorphous material changes from a glassy solid state to a rubbery state. This temperature may be measured by differential thermal analysis (DTA) and differential calorimetry (“DSC” method, for “Differential Scanning Calorimetry”). In particular, the glass transition temperature may be measured by differential calorimetry (DSC) according to ASTM standard D3418-97.
The expression “cosmetically acceptable medium” means a medium that is compatible with keratin materials, for instance human skin.
The particles according to the invention, also known as multiphase particles (or composites), are particles comprising at least one supple phase and at least one rigid phase.
The supple polymer of the particles in dispersion has at least one glass transition temperature of less than or equal to 60° C., especially ranging from −120° C. to 60° C., preferably less than or equal to 45° C,. especially ranging from −120° C. to 45° C. and preferentially less than or equal to 30° C., especially ranging from −120° C. to 30° C.
The supple polymer may be chosen from block polymers and/or random polymers. The expression “block polymers and/or random polymers” means polymers whose monomer distribution on the main chain or pendent chain members is in block and/or random form.
The supple polymer may be chosen from free-radical polymers, polycondensates and silicone polymers. The supple polymer may be chosen from polyacrylics, polymethacrylics, polyamides, polyurethanes, polyolefins, especially polyisoprenes, polybutadienes and polyisobutylenes (PIB), polyesters, polyvinyl ethers, polyvinylthio ethers, polyoxides, polysiloxanes and especially polydimethylsiloxanes (PDMS), and combinations thereof. The term “combinations” means copolymers that may be formed from monomers, leading to the formation of said polymers.
Preferably, the supple polymer may be chosen from poly(meth)acrylics, polyurethanes, polyolefins and polysiloxanes.
The amorphous material of the rigid phase has a glass transition temperature of greater than 60° C., especially greater than 60° C. and less than or equal to 200° C., preferably greater than or equal to 70° C., especially ranging from 70° C. to 200° C., in particular ranging from 70° C. to 150° C., and preferentially greater than or equal to 90° C., especially ranging from 90° C. to 150° C.
The amorphous material of the rigid phase may be a polymer, especially a block and/or random polymer. It may be a polymer chosen from polyacrylics, polymethacrylics such as, for example, poly((meth)acrylic acid), poly(meth)acrylamides, polyvinyls, polyvinyl esters, polyolfeins, polystyrenes, polyvinyl halides, for instance polyvinyl chloride (PVC), polyvinylnitriles, polyurethanes, polyesters, polyamides, polycarbonates, polysulfones, polysulfonamides, polycyclics containing a carbon-based ring in the main chain, for instance polyphenylenes or polyoxyphenylenes, and combinations thereof.
Preferably, the amorphous material of the rigid phase may be a polymer chosen from polyacrylics, polymethacrylics such as, for example, poly((meth)acrylic acid), poly(meth)acrylamides, polyvinyls, polyvinyl esters, polyolefins, polystyrenes, polyvinyl halides, for instance polyvinyl chloride (PVC), polyvinylnitriles, polyurethanes, polyamides and polyesters.
According to one preferred embodiment of the invention, the supple and rigid phases of the multiphase particles may comprise at least one free-radical polymer obtained by, or even essentially by, polymerization of monomers chosen from the group formed by:
(meth)acrylic acid esters, for instance alkyl (meth)acrylates, especially containing a C
1
-C
8
alkyl group,
vinyl esters of linear or branched carboxylic acids, such as vinyl acetate or vinyl stearate,
styrene and its derivatives, such as chloromethylstyrene or &agr;-methylstyrene,
conjugated dienes, such as butadiene or isoprene,
acrylamide, methacrylamide and acrylonitrile,
vinyl chloride,
(meth)acrylic acid.
The selection of monomers (nature and content), which may be a single monomer or a mixture of at least two monomers, of the supple polymer and of the amorphous material of the rigid phase, is determined by the glass transition temperature that it is desired to give to each polymer.
The polymers of the rigid and/or supple phases may be crosslinked with mon
Auguste Frederic
Tournilhac Florence
Finnegan Henderson Farabow Garrett & Dunner LLP
L'Oreal (S.A.)
Venkat Jyosthna
LandOfFree
Mascara comprising a particle dispersion does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mascara comprising a particle dispersion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mascara comprising a particle dispersion will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3203783