Block-graft copolymer

Claim 1

A block-graft copolymer comprising: a polymer block having a repeating unit represented by General Formula (I): ##STR13## wherein R 1 represents a hydrogen atom, methyl group or ethyl group; R 2 and R 3 may be the same or different and each represent an alkyl group having 1 to 3 carbon atoms or phenyl group; m represents an integer of 0 to 4; and A represents any one of polymer residual groups represented by General Formulas (II) to (IV) shown below, ##STR14## wherein R 4 may be the same or different and each represent methyl group, ethyl group or phenyl group; R 5 is as defined for R 4 or represents a group represented by the formula --Si(R 4 ) 3 ; and n is an integer of 1 to 1,000, ##STR15## wherein R 6 represents a hydrogen atom or methyl group; and B represents a group represented by the formula --COOR 2 , where R 2 is as defined above, ##STR16## --CH═CH 2 or --C(CH 3 )═CH 2 ; Y represents cumyl group, n-butyl group, s-butyl group or benzophenone residual group; and n is as defined above, ##STR17## wherein Y represents cumyl group, n-butyl group or s-butyl group, and n is as defined above, and at least one of polymer blocks having a repeating unit represented by General Formula (V): ##STR18## wherein R 7 represents a hydrogen atom, methyl group or ethyl group; M represents at least one selected from a group represented by the formula --CH═CH 2 , --C(CH 3 )═CH 2 , --COOCH 3 or --COOC 2 H 5 and phenyl group.