Block polymers and their process of preparation

A cosmetic composition comprising at least one block polymer, wherein the block polymer comprises:

• 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 CH2═CH—COOR2 wherein R2 is chosen from C4 to C12 cycloalkyl groups and at least one methacrylate monomer of formula CH2═C(CH3)—COOR′2 wherein R′2 is chosen from C4 to C12 cycloalkyl groups, and
• 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 acrylate monomers of formula CH2═CHCOOR3, wherein R3 is chosen from linear or branched unsubstituted C1 to C12 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 CH2═CHCOOR3 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.

A cosmetic process for making up and/or caring for keratinous substances, comprising applying to the keratinous substances a cosmetic composition comprising at least one block polymer, wherein the block polymer comprises:

• 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 CH2═CH—COOR2 wherein R2 is chosen from C4 to C12 cycloalkyl groups and at least one methacrylate monomer of formula CH2═C(CH3)—COOR′2 wherein R′2 is chosen from C4 to C12 cycloalkyl groups, and
• 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 CH2═CHCOOR3 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.

A process for improving the hold of a

• cosmetic composition while maintaining its gloss, comprising including in said cosmetic composition at least one block polymer, wherein the block polymer comprises:
• 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 CH2═CH—COOR2 wherein R2 is chosen from C4 to C12 cycloalkyl groups and at least one methacrylate monomer of formula CH2═C(CH3)—COOR′2 wherein R′2 is chosen from C4 to C12 cycloalkyl groups, and
• 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 CH2═CHCOOR3, wherein R3 is chosen from linear or branched unsubstituted C1 to C12 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 CH2═CHCOOR3 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.

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 CH2═CH—COOR2 wherein R2 is chosen from C4 to C12 cycloalkyl groups and at least one methacrylate monomer of formula CH2═C(CH3)—COOR′2 wherein R′2 is chosen from C4 to C12 cycloalkyl groups, and
• wherein the second block comprises at least one acrylic acid monomer and at least one monomer selected from isobutyl acrylate and 2-ethylhexyl acrylate,
• wherein the at least one acrylic acid monomer and the at least one monomer selected from isobutyl acrylate and 2-ethylhexyl acrylate 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.