Patent ID: 8183322

Claim:
A composition comprising a) at least one lactic acid homopolymer and b) at least one block copolymer with a polydispersity index ranging from 1.5 to 5, wherein the block copolymer comprises: at least one block A that is miscible with the lactic acid homopolymer and formed from monomers containing at least one methacrylate of formula CH 2 ═C(CH 3 )—COOR 1 in which R 1 is a linear or branched C 1 -C 3 alkyl group, a branched C 4 group, a C 3 -C 8 cycloalkyl group, a C 6 -C 20 aryl group, a C 7 -C 30 arylalkyl group containing a C 1 -C 4 alkyl group, a heterocyclic group or a heterocyclylalkyl group containing a C 1 -C 4 alkyl group, these groups being optionally substituted with one or more identical or different groups selected from the group consisting of halogen and hydroxyl groups, wherein block A comprises, in addition to methacrylate, at least one dialkylacrylamide monomer in which the linear or branched alkyl groups independently contain from 1 to 10 carbon atoms, and at least one block B that is immiscible with the lactic acid homopolymer and formed from monomers comprising one or more monomers selected from the group consisting of: alkyl acrylates of formula CH 2 ═CH—COOR 2 in which R 2 is a linear or branched C 1 -C 12 alkyl group optionally substituted with one or more identical or different groups selected from the group consisting of halogen and hydroxyl groups, and methacrylates of formula CH 2 ═C(CH 3 )—COOR 3 in which R 3 is a linear C 4 -C 12 alkyl group or a branched C 5 -C 12 alkyl group.