Triazine ring-containing polymer and film forming composition containing same

A triazine ring-containing polymer comprising a repeating unit structure represented by formula (1) below, having at least one triazine ring terminal, and at least a part of the triazine ring terminal being blocked with an arylamino group having crosslinking group,

• wherein each of R and R′ independently represents a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, or an aralkyl group, and
• Ar represents at least one group selected from those represented by the formulae (2) to (13),
• wherein each of R1 to R92 independently represents a hydrogen atom, a halogen atom, a carboxy group, a sulfo group, an alkyl group having 1 to 10 carbon atoms, a halogenated alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms,
• each of R93 and R94 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms,
• each of W1 and W2 independently represents a single bond, CR95R96, C═O, O, S, SO, SO2, or NR97, wherein each of R95 and R96 independently represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, wherein R95 and R96 may form a ring together, wherein R97 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or a phenyl group,
• each of X1 and X2 independently represents a single bond, an alkylene group having 1 to 10 carbon atoms, or a group represented by formula (14),
• wherein each of R98 to R101 independently represents a hydrogen atom, a halogen atom, a carboxy group, a sulfo group, an alkyl group having 1 to 10 carbon atoms, a halogenated alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms,
• each of Y1 and Y2 independently represents a single bond or an alkylene group having 1 to 10 carbon atoms, and
• wherein the crosslinking group is a hydroxyalkyl group or a (meth) acryloyl-containing group.