Photodimerizable polymers comprising at least one polyoxyalkylene group, composition comprising same and cosmetic treatment process

Photodimerizable polymer (P) comprising at least one photodimerizable pendant group and at least one polyoxyalkylene pendant group, wherein the photodimerizable pendant group(s) are chosen from monovalent radicals of formulae (I) and (II) below:

• and also the geometrical isomers thereof,
• in which formulae (I) and (II):
• Y and Z denote, independently of each other, a nitrogen atom or a C(R) group with R representing a hydrogen atom or a (C1-C4)alkyl group such as methyl;
• A represents a bond or a divalent group chosen from (C1-C5)alkylene, arylene, heteroarylene, cycloalkylene, heterocycloalkylene, (thio)carbonyl and (C2-C5)alkenylene radicals and combinations thereof;
• B represents a monovalent group chosen from (C1-C5)alkyl radicals, aryl radicals, optionally cationic heteroaryl radicals, cycloalkyl radicals, optionally cationic heterocycloalkyl radicals, (thio)carbonyl radicals and (C2-C5)alkenyl radicals and combinations thereof;
• X represents a divalent group chosen from (C2-C5)alkylene, arylene, heteroarylene, cycloalkylene, heterocycloalkylene, (thio)carbonyl and (C2-C5)alkenylene radicals and combinations thereof;
• p represents an integer between 1 and 5 inclusive, in particular between 1 and 3;
• preferably, p is equal to 1;
• represents the bond which connects the part of the monovalent radical to the rest of the molecule;
• and
• each of the groups mentioned may optionally be substituted with one or more halogen atoms or groups chosen from the following:
• (C1-C6)alkyl, hydroxyl, amino, (di)(C1-C6)alkylamino, phenyl, carboxyl, (C1-C6)alkoxy, (C1-C6)alkoxy(thio)carbonyl, hydrogeno(thio)carbonyl, sulfonato R—O—S(O)2— or R—S(O)2—O−, amide RR′N—C(O)— or R—C(O)—N(R′)— or acyl R—C(O)—, ammonium R′R″N+— with R, R′ and R″, which may be identical or different, representing a hydrogen atom or a (C1-C4)alkyl group.