| Cosmetic or dermatological composition comprising at least one gradient copolymer, makeup comprising the cosmetic or dermatological composition and cosmetic method using the composition -> Monitor Keywords |
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Cosmetic or dermatological composition comprising at least one gradient copolymer, makeup comprising the cosmetic or dermatological composition and cosmetic method using the compositionRelated Patent Categories: Drug, Bio-affecting And Body Treating Compositions, Live Hair Or Scalp Treating Compositions (nontherapeutic), Polymer Containing (nonsurfactant, Natural Or Synthetic)Cosmetic or dermatological composition comprising at least one gradient copolymer, makeup comprising the cosmetic or dermatological composition and cosmetic method using the composition description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20050255068, Cosmetic or dermatological composition comprising at least one gradient copolymer, makeup comprising the cosmetic or dermatological composition and cosmetic method using the composition. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application claims benefit of U.S. Provisional Application No. 60/457,998, filed Mar. 28, 2003. [0002] This disclosure relates to novel topical cosmetic or dermatological compositions comprising at least one gradient copolymer comprising at least two monomeric residues, such as amphiphilic gradient copolymers, that may, for example, be soluble or dispersible in water and/or in organic solvents, and wherein the at least one gradient copolymer exhibits a mass polydispersity index (Ip) less then or equal to 2.5. [0003] In the area of cosmetics, we often aim to provide compositions that make it possible to obtain a deposit that is notably adhesive or film-forming, on the keratinous substances in question, such as the hair, skin, eyelashes or nails. [0004] For example, these compositions can supply colour (make-up or hair colouring compositions), gloss or matt appearance (compositions for skin care or make-up), physical properties, such as for shaping (hair-care compositions, for instance, for styling), and properties of care or protection (care compositions, for example, for moisturizing or for UV protection). [0005] Generally, cosmetic compositions call for such characteristics as good retentiveness and long-lasting quality of the cosmetic deposit, as well as good adhesion to the substrate. For example, it may be useful for the deposit to be able to withstand mechanical action, such as rubbing, transfer by contact with another object; resistance to water, sweat, tears, rain, sebum and oils. This may be true, for instance, in the case of make-up, such as in the area of lipsticks where the colour and gloss are required to be long-lasting and there should be no transfer of colour; and in the area of foundations, eyeshadows and powders, where the colour supplied is to be long-lasting, while maintaining the matt appearance of the initial complexion for as long as possible despite the secretion of sebum and sweat, as well as non-transfer. Furthermore, make-up compositions should be comfortable to wear and their texture should not be too sticky. [0006] To reconcile some of these varying properties within a single composition, we generally use a mixture of several polymers, with very different chemical natures, each polymer supplying one of the desired characteristics. However, the use of a mixture of polymers which possess different chemical natures may, for example, not be compatible, and can cause problems of demixing within the composition. [0007] The use of random polymers, for example conventional acrylic polymers obtained by classical radical polymerization and by random mixing of monomers, does not provide a satisfactory solution to these problems. In fact, the random polymers, known in the prior art, exhibit a dispersity in composition of the polymer chains, which may also lead to demixing of the polymers within the formulation. [0008] This disclosure overcomes at least one drawback of the prior art by proposing, as recited in the claims herein, a cosmetic or dermatological composition comprising at least one gradient copolymer, of the type that can avoid the problems of demixing within the formulation, while providing at least one desired cosmetic property. [0009] One aspect of the present disclosure is a cosmetic or dermatological composition comprising at least one gradient copolymer comprising at least two different monomeric residues, and displaying a mass polydispersity index (Ip) less than or equal to 2.5, ranging from 1.1 to 2.3, for example, ranging from 1.15 to 2.0, and further, for example, ranging from 1.2 to 1.9 or even to 1.8. [0010] The at least one gradient copolymer, as disclosed herein, can have a low dispersity in composition and the polymer chains comprising the gradient copolymers can have similar or the same structures. Therefore, such copolymers are compatible with one another and, as a result, the cosmetic compositions comprising these copolymers exhibit less than all of the drawbacks and limitations of the compositions of the prior art. [0011] For example, the at least one gradient copolymer, as disclosed herein, can be easily manipulated in water or in an organic solvent medium, while retaining its useful rheological properties. [0012] Furthermore, the at least one copolymers, disclosed herein, can be chosen from gradient copolymers, which comprise at least two different monomeric residues, and which may have a low mass polydispersity, as defined in paragraph [009], and, for instance, a low composition polydispersity. [0013] The mass polydispersity can be illustrated using the mass polydispersity index (Ip) of the copolymer, which is equal to the ratio of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn). [0014] A low mass dispersity reflects approximately identical chain lengths, which is the case for the gradient copolymers as disclosed herein. [0015] According to the disclosure, the at least one gradient copolymer has a mass polydispersity index less than or equal to 2.5, for example, ranging from 1.1 to 2.3, for instance, ranging from 1.15 to 2.0, or further, for example, from 1.2 to 1.9 or 1.8. [0016] Furthermore, the weight-average molecular weight of the at least one gradient copolymer can range from 5,000 g/mol to 1,000,000 g/mol, for instance, range from 5,500 g/mol to 800,000 g/mol, and further, for example, from 6,000 g/mol to 500,000 g/mol. [0017] The number-average molecular weight of the at least one gradient copolymer can also range from 5,000 g/mol and 1,000,000 g/mol, for example, from 5,500 g/mol and 800,000 g/mol, and even further, for example, from 6,000 g/mol and 500,000 g/mol. [0018] The weight-average (Mw) and number-average (Mn) molecular weights are determined by gel permeation liquid chromatography ("GPC") (wherein eluent THF, a calibration curve established with linear polystyrene standards, and refractometric detector are used). [0019] The at least one gradient copolymer, according to the present disclosure, could, for example, also have a low composition dispersity. For the purpose of this disclosure, low composition dispersity means that all the polymer chains of the at least one gradient copolymer, have a roughly similar composition (i.e. a concatenation of monomers) and are therefore generally homogeneous in composition. [0020] In order to show that all the polymer chains of the at least one gradient copolymer have a similar composition, liquid adsorption chromatography ("LAC") can be used to separate the chains of the copolymers according to their polarity, rather than according to their molecular weight. Without being bound by theory, it is believed that the chain's polarity reflects the chemical composition of the polymers of which the material is constituted. [0021] One may refer to the publication Macromolecules (2001), 34, 2667, which describes the LAC technique. [0022] For instance, the composition polydispersity can be defined from the LAC curve (the curve representing the proportion of polymers as a function of the elution volume): if we call the minimum value of the elution volume at mid-height of the curve V.sup.1/2 min, and the maximum value of the elution volume at mid-height of the curve V.sup.1/2 max, the composition polydispersity is regarded as low if the difference (V.sup.1/2max-V.sup.1/2m in) is less than or equal to 3.5, for example, ranging from 1 to 2.8 and further, ranging from 1.2 to 2.5. [0023] The LAC curve can be further defined by a Gaussian curve with the formula: 1 y = A w 2 .times. e - 2 ( x - x 0 ) 2 w 2 + y 0 [0024] wherein: Continue reading about Cosmetic or dermatological composition comprising at least one gradient copolymer, makeup comprising the cosmetic or dermatological composition and cosmetic method using the composition... Full patent description for Cosmetic or dermatological composition comprising at least one gradient copolymer, makeup comprising the cosmetic or dermatological composition and cosmetic method using the composition Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Cosmetic or dermatological composition comprising at least one gradient copolymer, makeup comprising the cosmetic or dermatological composition and cosmetic method using the composition patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. 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