| 摘要 |
PROBLEM TO BE SOLVED: To provide an epoxy resin composition providing a cured product of an epoxy resin, having a high glass transition temperature and a low dielectric loss tangent, and containing a polyester having excellent solubility in a solvent as a curing agent. SOLUTION: The polyester having an aryloxycarbonyl group at the terminal of a molecular chain, and comprising an aromatic polybasic carboxylic acid residue and an aromatic polyhydric hydroxy compound residue is used as the curing agent of the epoxy resin. The cured product has a high crosslinking density because the whole ester bonds forming the molecular chain of the polyester can be crosslinking points, and the cured product exhibits a high glass transition temperature and a low dielectric loss tangent because a hydroxy group having a high polarity is not formed at curing. The epoxy resin composition containing the polyester has excellent solvent solubility because the crystallization of the molecular chain is suppressed because of the highly balky structure possessed by the polyester. COPYRIGHT: (C)2004,JPO
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