| abstract |
A polymer containing a structural unit represented by the following formula (A). In the formula (A), each of P is a group represented by the following formula (P). L represents a linking group. a is an integer from 2 to 5, and b is an integer from 0 to 5. In the formula (P), each A is a nitrogen atom or CR. X is a single bond, O, S, C(R) 2 or NR. R is each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, or the like, or a single bond bonded to another P or L. Here, in (P)a, at least one R is represented by any one of the following formulas (3) to (7). □□□□ |