Block ethylenic copolymers cosmetic compositions containing them and cosmetic use of these copolymers

摘要

Linear block ethylenic copolymer comprising: at least two blocks with different glass transition temperatures (Tg); at least one of these blocks having a glass transition temperature of greater than or equal to 20° C.; said polymer also having mechanical parameters that satisfy at least one of the following three conditions: a Young's modulus E such that: 500 MPa<=E<=2000 MPa; an ultimate strain epsilonr such that: 5%<=EPSILONr<=50%; an ultimate strain energy wr such that: 0.1x10<5 >J/m<3><Wr<150X10<5 >J/m<3>. Cosmetic composition comprising said polymer. The copolymer makes it possible to improve the styling power and the hold of a hair lacquer, to increase the adhesion and the wear strength of a nail varnish and to improve the staying power of a makeup composition without the compositions being tacky.