Use in cosmetics of block ethylene copolymers with elastic character and compositions containing same
AssigneeL'oreal
InventorNathalie Mougin
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Abstract
The invention relates to the cosmetic use of block ethylenic copolymers of elastic nature comprising at least one rigid block having a glass transition temperature (Tg) of greater than or equal to 20° C. and at least one flexible block having a glass transition temperature (Tg) which is less than 20° C., said compolymers making it possible to obtain a film having an instantaneous recovery of between 5% and 100%. The invention also relates to cosmetic compositions containing these block ethylenic polymers of elastic nature.
Claims51
A method of making a cosmetic composition comprising incorporating block ethylenic copolymers of elastic nature into said composition, said block ethylenic copolymers of elastic nature comprising
- (a) at least one rigid block (A) having a glass transition temperature (Tg) of greater than or equal to 20° C., consisting of units derived from one or more ethylenic monomers, and
- (b) at least one flexible block (B) having a glass transition temperature (Tg) of less than 20° C., consisting of units derived from one or more ethylenic monomers,
- said copolymers allowing the production of a film having an instantaneous recovery of between 5% and 100%
- with the exclusion of block copolymers having flexible blocks consisting exclusively of ethylene, propylene, butylene, butadiene and/or isoprene units.
A cosmetic composition comprising, in a physiologically acceptable medium, at least one block ethylenic copolymer of elastic nature comprising
- (a) at least one rigid block (A) shaving a glass transition temperature (Tg) of greater than or equal to 20° C., consisting of units derived from one or more ethylenic monomers, and
- (b) at least one flexible block (B) having a glass transition temperature (Tg) of less than 20° C., consisting of units derived from one or more ethylenic monomers,
- said copolymers allowing the production of a film having an instantaneous recovery of between 5% and 100%
- with the exclusion of block copolymers having flexible blocks consisting exclusively of ethylene, propylene, butylene, butadiene and/or isoprene units.
Dependencies are inferred from the claim text.