Epoxy polymer, epoxy resin, epoxy resin composition, resin sheet, b-stage sheet, cured product, c-stage sheet, metal foil with resin, metal substrate and method for manufacturing

An epoxy polymer comprising:

• a mesogen skeleton;
• and
• a structural unit represented by the following Formula (A):
• wherein, in Formula (A), each R5 independently represents an alkyl group having from 1 to 8 carbon atoms;
• and n represents an integer of 0 to 3,
• wherein the epoxy polymer is a reaction product obtained by reacting an epoxy compound that has a mesogen skeleton and two epoxy groups with a trihydric phenol compound that has three hydroxy groups on a single benzene ring as substituents with a ratio (Ep/Ph) between the number of equivalents of the epoxy groups of the epoxy compound (Ep) and the number of equivalents of the phenolic hydroxy groups of the trihydric phenol compound (Ph) being set in a range of from 100/30 to 100/15,
• wherein the trihydric phenol compound is at least one selected from the group consisting of 1,2,4-trihydroxybenzene and 1,3,5-trihydroxybenzene,
• wherein the epoxy polymer includes at least one selected from the group consisting of a structural unit represented by the following Formula (IA) and a structural unit represented by the following Formula (TB):
• wherein, in Formula (IA) and Formula (TB), each of R1 to R4 independently represents a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms;
• each R5 independently represents an alkyl group having from 1 to 8 carbon atoms;
• and n represents an integer of 0 to 3.