Cosmetic and personal care compositions
AssigneeUnilever Home & Personal Care USA, Division of Conopco, Inc.
InventorsJean M.J. Frechet, Damian Hajduk, Ezat Khoshdel, Mingjun Liu, Ralph B. Nielsen, Euan Stuart Reid, Keith Leslie Rutherford
Life of this patent
Estimating the term…
Abstract
Cosmetic or personal care compositions, such as for styling hair, comprise a thermoplastic elastomer which is a block copolymer comprising a core polymer having a backbone comprising at least a proportion of C—C bonds and two or more flanking polymers. Each flanking polymer is covalently bound to an end of the core polymer and the copolymer is soluble at a level of at least 1% by weight in water at 25° C. The compositions comprise a cosmetically acceptable diluent or carrier.
Claims26
Cosmetic or personal care composition comprising a thermoplastic elastomer which is a block copolymer comprising a core polymer having a backbone comprising at least a proportion of C—C bonds and two or more flanking polymers, each flanking polymer being covalently bound to an end of the core polymer, wherein the copolymer is soluble at a level of at least 1% by weight in water at 25° C., and a cosmetically acceptable diluent or carrier.
Composition as claimed in any one of the preceding claims, wherein the block copolymer is linear or star-shaped.
Composition as claimed in any one of the preceding claims, wherein the block copolymer is a linear ABA block copolymer.
Composition as claimed in any one of the preceding claims, wherein the core polymer is a polymer of a (C1-C3 alkoxy) C1-C6 alkyl acrylate.
Composition as claimed in any one of the preceding claims, wherein the flanking polymers are polymers of N,N-dimethyl acrylamide.
Composition as claimed in any one of the preceding claims, wherein the copolymer is a poly(N,N-dimethyl acrylamide)-poly ((2-methoxyethyl) acrylate)-poly(N,N-dimethyl acrylamide) block copolymer.
Composition as claimed in any one of the preceding claims, which comprises from 0.1 to 10% by weight of the block copolymer.
Composition as claimed in any one of the preceding claims, wherein the core polymer has a weight average molecular weight of from 20 kDa to 500 kDa.
Composition as claimed in any one of the preceding claims, wherein the flanking polymers have a weight average molecular weight of from 200 Da to 50 kDa.
Composition as claimed in any one of the preceding claims, wherein the molar ratio of the core polymer to the flanking polymers is from 1:10 to 10:1.
Composition as claimed in any one of the preceding claims, wherein the block copolymer has a bond strength of at least 30 g at 25° C. and 30% relative humidity.
Composition as claimed in any one of the preceding claims, wherein the polymer has a viscosity of less than 15 cp as determined for 5 wt % polymer in 50 vol % aqueous ethanol solution at 25° C. using capillary viscometry and assuming a viscosity for deionised water of 1 mPas.
Composition as claimed in any one of the preceding claims, wherein the block copolymer has an elastic modulus of less than 0.45 Gpa.
Composition as claimed in any one of the preceding claims, which further comprises a fragrance or perfume.
Composition as claimed in any one of the preceding claims, which is a hairspray, mousse or gel for styling hair.
Dependencies are inferred from the claim text.