| abstract |
Provided are: a highly durable polymer having a high hole-injection/transport capacity; and a composition for an organic electroluminescent element, which contains the polymer. The polymer contains a repeating unit represented by the following Formula (1) or a repeating unit represented by the following Formula (2) (wherein, Ar 1 and Ar 2 each represent an aromatic hydrocarbon group optionally having a substituent, or an aromatic heterocyclic group optionally having a substituent; X represents —C(R 7 )(R 8 )—, —N(R 9 )—, or —C(R 11 )(R 12 )—C(R 13 )(R 14 )—; R 1 and R 2 as well as R 3 and R 6 each independently represent an alkyl group optionally having a substituent; R 4 and R 5 each independently represent an alkyl group optionally having a substituent, an alkoxy group optionally having a substituent, or an aralkyl group optionally having a substituent; and R 7 to R 9 and R 11 to R 14 each independently represent hydrogen, an alkyl group optionally having a substituent, an aralkyl group optionally having a substituent, or an aromatic hydrocarbon group optionally having a substituent). |