Resin, copolymer, electronic substrate material, resin composition, coating liquid composition, cured product, film, sheet, and electronic substrate

A resin composition comprising:

• a first resin and a second resin, wherein
• the first resin is at least one resin selected from the group consisting of polycarbonate, polyester, and polyester polycarbonate,
• the first resin includes a structural unit represented by a formula (C1) below, and at least one structural unit selected from the group consisting of structural units represented by formulae (A1), (B1), and (D1) below, and
• the second resin is an epoxy resin,
• where in the formula (A1):
• Ax is a divalent group containing at least one group selected from the group consisting of a substituted or unsubstituted divalent aromatic hydrocarbon group, a substituted or unsubstituted divalent cyclic aliphatic hydrocarbon group, and a substituted or unsubstituted divalent acyclic aliphatic hydrocarbon group;
• a is a mole fraction of the structural unit represented by the formula (A1),
• in the formula (B1):
• b is a mole fraction of the structural unit represented by the formula (B1);
• and
• the structural unit represented by the formula (B1) is different from carbonyl groups in the formulae (A1), (C1), and (D1),
• in the formula (C1):
• R11 is a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, a substituted or unsubstituted cycloalkoxy group having 3 to 20 ring carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 14 carbon atoms;
• R12 is a group containing at least one selected from the group consisting of a substituted or unsubstituted monovalent aromatic hydrocarbon group, a substituted or unsubstituted monovalent cyclic aliphatic hydrocarbon group, a substituted or unsubstituted monovalent acyclic aliphatic hydrocarbon group, a substituted or unsubstituted divalent aromatic hydrocarbon group, a substituted or unsubstituted divalent cyclic aliphatic hydrocarbon group, and a substituted or unsubstituted divalent acyclic aliphatic hydrocarbon group;
• R131 to R138 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 ring carbon atoms, or a substituted or unsubstituted aryl group having 6 to 14 carbon atoms;
• c is a mole fraction of the structural unit represented by the formula (C1);
• and
• n represents 0, 1, 2, 3, or 4;
• and
• in the formula (D1):
• Dx is a divalent group containing at least one group selected from the group consisting of a substituted or unsubstituted divalent aromatic hydrocarbon group, a substituted or unsubstituted divalent cyclic aliphatic hydrocarbon group, and a substituted or unsubstituted divalent acyclic aliphatic hydrocarbon group;
• d is a mole fraction of the structural unit represented by the formula (D1),
• substituents for a “substituted or unsubstituted” group are bonded to each other to form a monocyclic ring, bonded to each other to form a fused ring, or not bonded to each other,
• each * in the formulae (A1), (B1), (C1), and (D1) represents a bond,
• when the first resin includes a plurality of structural units represented by the formula (A1), the plurality of structural units represented by the formula (A1) are identical to each other or different from each other,
• when the first resin includes a plurality of structural units represented by the formula (C1), the plurality of structural units represented by the formula (C1) are identical to each other or different from each other, and
• when the first resin includes a plurality of structural units represented by the formula (D1), the plurality of structural units represented by the formula (D1) are identical to each other or different from each other.