Patent ID: 8710152

Claim:
A block polymer comprising at least one first block, at least one second block, and an intermediate block linking the at least one first block and the at least one second block, wherein the first block consists essentially of at least one acrylate monomer of formula CH 2 ═CH—COOR 2 wherein R 2 is chosen from C 4 to C 12 cycloalkyl groups and at least one methacrylate monomer of formula CH 2 ═C(CH 3 )—COOR′ 2 wherein R′ 2 is chosen from C 4 to C 12 cycloalkyl groups, and wherein the second block comprises at least one acrylic acid monomer and at least one acrylate monomer with a glass transition temperature of less than or equal to 20° C. chosen from monomers of formula CH 2 ═CHCOOR 3 , wherein R 3 is chosen from linear or branched unsubstituted C 1 to C 12 alkyl groups, with the exception of the tert-butyl group, wherein the at least one acrylic acid monomer and the at least one acrylate monomer with a glass transition temperature of less than or equal to 20° C. chosen from monomers of formula CH 2 ═CHCOOR 3 are present in the block polymer in proportions by weight ranging from 10:90 to 20:80, wherein the intermediate block comprises at least one constituent monomer of the first block and at least one constituent monomer of the second block.