| 摘要 |
PURPOSE:To prevent possible void by a method wherein a base material impregnated with an insaturated resin varnish blended with a specified amount of an epoxy resin is used to form a belt-shaped laminated body, which is hardened by press molding after half-hardened without pressure applied. CONSTITUTION:A thermosetting insaturated resin is blended with an epoxy resin at a rate of 30-97wt% in the total to prepare an insaturated resin varnish. A base material such as glass cloth and glass paper or glass cloth and paper is impregnated with the insaturated resin varnish thus obtained and the resin-impregnated base material thus obtained is used to mold a belt-shaped laminated body. The laminated body is being transferred to be half-hardened without pressure applied and then, hardened by a press molding to obtain a laminated board. The insaturated resin available is insaturated polyester resin, diallylphthalate resin or the like and is diluted with vinyl monomer or the like to make a resin varnish with the addition of a polymerization initiator such as benzylperoxide. |
