| abstract |
The present invention relates to a copolymer obtained by polymerization of monomers (A), (B), (C) and (D), wherein (A) is a monomer represented by formula (I); [Chemical 1] Wherein A is C 2 -C 4 alkylene, and B is C 2 -C 4 alkylene different from A, R is hydrogen or methyl, m is a number from 1 to 500, n Is a number from 1 to 500, and the sum m + n is equal to 2 to 1000.), (B) is a monomer represented by formula (II), [Chemical 2] (Wherein D is C 3 alkylene, and R is hydrogen or methyl, and o is a number from 2 to 500), (C) is an ethylenically unsaturated monomer containing an aromatic group , (D) is an ethylenically unsaturated monomer containing an alkyl residue. |