| 摘要 |
PROBLEM TO BE SOLVED: To provide a preliminarily hardened product and a hardened product of an epoxy resin composition having a stable and low dielectric loss tangent, high adhesion strength and high heat resistance and a method of producing the products. SOLUTION: The products are made from an epoxy resin composition consisting of an epoxy resin, an active ester compound and a hardening accelerator and have a content of a residual organic solvent of 0.10 wt.% or lower. The method comprises hardening preliminarily an epoxy resin composition consisting of an epoxy resin, an active ester compound, a hardening accelerator and an organic solvent while evaporating the solvent to a content of residual organic solvent of 0.10 wt.% or lower, heating the resultant preliminarily hardened product further to obtain a hardened product of a content of residual organic solvent of 0.10 wt.% or lower with a difference between the content of residual organic solvent of the preliminarily hardened product and that of the hardened product of 0.02% or smaller. COPYRIGHT: (C)2003,JPO
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