| Composition for coating keratin fibres, comprising a high dry extract that contains a sequenched polymer -> Monitor Keywords |
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Composition for coating keratin fibres, comprising a high dry extract that contains a sequenched polymerRelated Patent Categories: Drug, Bio-affecting And Body Treating Compositions, Live Hair Or Scalp Treating Compositions (nontherapeutic)Composition for coating keratin fibres, comprising a high dry extract that contains a sequenched polymer description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060099164, Composition for coating keratin fibres, comprising a high dry extract that contains a sequenched polymer. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The subject of the present invention is a cosmetic composition for coating keratin fibres comprising a block polymer. [0002] The invention also relates to a cosmetic process for making up or treating keratin fibres such as the eyelashes, the eyebrows and the hair. [0003] The composition according to the invention may be a makeup composition, also called mascara, a makeup base for keratin fibres or base coat, a composition to be applied over makeup, also known as top coat, or a composition for treating keratin fibres. More especially, the composition according to the invention is a mascara. [0004] The term "mascara" is understood as meaning a composition intended to be applied to the eyelashes: it may be a makeup composition for the eyelashes, a makeup base for the eyelashes, a composition to be applied over a mascara, also known as top coat, or a cosmetic treatment composition for the eyelashes. The mascara is more particularly intended for the eyelashes of human beings, but also for false eyelashes. [0005] Preferably, the composition according to the invention is a leave-in composition. [0006] Makeup compositions for the eyes, and in particular for the eyelashes, such as mascaras, may be provided in various forms: for example in the form of biphasic oil-in-water or O/W or water-in-oil W/O emulsions, or of aqueous or anhydrous dispersions. [0007] It is generally through the qualitative and quantitative choice of the waxes and polymers that the desired specificities of application are adjusted for the makeup compositions, such as their fluidity, their covering power and/or their curling power. Thus, it is possible to prepare various compositions which, when applied in particular to the eyelashes, induce varied effects of the lengthening, curling and/or thickening type (charging or volumizing effect). [0008] It is known from the prior art that the higher the content of solids (provided in part by a fatty phase consisting, for example, of one or more waxes or of one or more lipophilic polymers) in a composition, the greater the deposition of material on the eyelashes and therefore the more the result obtained will be volumizing. [0009] However, the increase in the content of solids in a composition, such as an emulsion or dispersion, causes an increase in the consistency of the product obtained and therefore a delicate and difficult application to the eyelashes because the product is thick and viscous, it forms a deposit with difficulty, in a heterogeneous manner and in packets. The increase in the content of solids is therefore often limited by the increase in consistency and does not exceed 45% of the total weight of the composition. This limitation on the content of solids is often linked to the impossibility of increasing, on the one hand, the wax content in the fatty phase which does not exceed 25% for reasons of feasibility (the compositions comprising between 20 and 25% by weight of wax are often very thick, compact, difficult to apply and have unsatisfactory cosmetic properties) and, on the other hand, of incorporating fat-soluble polymers in a large amount, which considerably increases the viscosity of the composition. [0010] Another means of increasing the content of solids is to incorporate solid particles such as fillers or pigments, but the increase in consistency also limits the maximum percentage of solids. Furthermore, the use of solid particles in a large quantity does not promote homogeneous and smooth deposition not only because of the consistency but also because of the size of the particles introduced, which gives a granular and unsmooth appearance to the deposit. [0011] That is generally the case for the so-called volumizing mascaras which are difficult to apply and which give a heterogeneous makeup. [0012] It is therefore difficult to obtain a makeup composition for the keratin fibres, comprising a high content of solids and therefore a satisfactory volumizing effect, which has easy and homogeneous application. [0013] Moreover, the increase in the content of solids and the nonhomogeneity of the deposit causes a poorer staying power of the composition film: the latter is not sufficiently resistant to rubbing, in particular of the fingers, and/or to water, during bathings and/or showers for example, or alternatively to tears or to sweat. The mascara then tends to crumble over time: grains become deposited and leave marks around the eye. [0014] The aim of the present invention is therefore to propose another route for formulating a composition for coating the keratin fibres leading to a keratin fibre charging effect, and which completely or partially solves the problems linked to conventional routes of formulation. In addition, the compositions according to the invention allow smooth and homogeneous application and lead to a makeup for keratin fibres exhibiting good staying power. [0015] The inventors have discovered that a composition of this type could be obtained using a particular block polymer. Surprisingly, the incorporation of such a polymer at high or very high contents (which may be up to 50% by weight) makes it possible to significantly increase the dry matter content of a composition for coating keratin fibres, while preserving a consistency which allows easy application to the keratin fibres, and leads, after application to keratin fibres, to a makeup film with good staying power over time: the film does not crumble. [0016] More precisely, a subject of the invention is a composition for coating keratin fibres comprising, in a cosmetically acceptable organic liquid medium, a film-forming linear ethylenic block polymer, called in the text that follows "block polymer", the said composition having a dry matter or dry extract content greater than or equal to 45% by weight. [0017] A subject of the invention is also a cosmetic process for making up or for the nontherapeutic care of keratin fibres, in particular the eyelashes, comprising the application of a composition as defined above to the keratin fibres. [0018] A subject of the invention is also the use of a composition as defined above for obtaining a makeup for the keratin fibres, in particular the eyelashes, which is charging and/or has good staying power. [0019] A subject of the invention is also the use of a film-forming linear ethylenic block polymer in a composition for coating keratin fibres, in order to obtain a composition that is easy to apply to the keratin fibres and/or leading to a makeup which is charging and/or has good staying power on the said keratin fibres. [0020] The term "cosmetically acceptable" organic liquid medium means an organic liquid medium that is compatible with the eyelashes or the skin. Protocol for Measuring the Dry Matter or Dry Extract Content [0021] The dry matter content, that is to say the content of nonvolatile material, may be measured in different ways; mention may be made for example of the methods based on drying in an oven, the methods based on exposure to infrared radiation and the chemical methods based on titration of water according to Karl Fischer. [0022] Preferably, the dry extract of the compositions according to the invention is measured on a Mettler Toledo HG 53 balance (Halogen Moisture Analyzer). [0023] A mascara sample (2-3 g) is deposited in an aluminium dish and subjected to a temperature of 120.degree. C. for 60 minutes. The measurement of the dry extract corresponds to the monitoring of the mass of the sample as a function of time. The final content of solids is therefore the percentage of the final mass (at the end of 60 min) relative to the initial mass: DE=(final mass/initial mass).times.100. 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