| abstract |
A polymerizable monomer is provided which is represented by the following formula (1): n n n n n n n n n n n n wherein R 1 represents a hydrogen atom or an alkyl group; A represents —CO— or —SO 2 —; and the moiety represented by the formula (1) is, at the part shown by an asterisk *, linked to a moiety represented by the following formula (2), at any position of a, b, c or d thereof; n n n n n n n n n n n n n n n n wherein the sites among a, b, c and d at which the moiety represented by the formula (2) is not linked to the moiety represented by the formula (1) each has a hydrogen atom or a substituent selected from the group consisting of an alkyl group, an alkoxy group and a sulfonic acid group, or any of which may connect at mutually adjoining positions to form a ring. |