| 摘要 |
<p>PURPOSE:To produce a laminate prevented from undergoing deterioration of insulation and copper migration after moisture or water absorption by sandwiching at least one prepreg prepared by impregnation with a specified epoxy resin between metallic mirror plates and molding the assemblage under applied heat and pressure. CONSTITUTION:An epoxy resin varnish is obtained by mixing an epoxy resin (i) containing at least 50wt.% bisphenol A epoxy resin with 0.3-0.7 equivalent, per equivalent of component (i), of dicyandiamide (ii) as a curing agent and 0.1-1.0wt.%, based on component (i), triphenylphosphine or tricresylphosphine (iii) as a curing catalyst. A base such as a glass cloth is impregnated with this varnish to obtain a prepreg. At least one such prepreg is sandwiched between metallic mirror plates, and the assemblage is molded under applied heat and pressure to obtain a laminate.</p> |
