| 摘要 |
A copolymer comprising a repeating unit of the following formula (1) and a repeating unit of the following formula (2): (wherein, a ring A and ring B represent each independently an aromatic ring optionally having a substituent. X is —O—, —S—, —S(═O)—, —S(═O)2—, —Si(R1)2—Si(R1)2—, —Si(R1)2—, —, —B(R1)—, —P(R1)—, —P(═O)(R1)—, —O—C(R1)2— or —N═C(R1)—, and R1 represents a substituent. When there are two or more R1s in the same formula, they may be the same or different.) (wherein, Y is —O—, —S— or —C(═O)—. Ar1 represents an aryl group optionally having a substituent or a monovalent heterocyclic group optionally having a substituent, and there is no substituent connected to atoms of the ring of Ar1, the atoms being adjacent an atom of Ar1 connected to a nitrogen atom in the formula. R3 represents a substituent, and n represents an integer of from 0 to 3. When there are two or more R2s in the formula, they may be the same or different.).
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