| 摘要 |
PURPOSE:To obtain the titled laminated board having excellent punchability at ordinary temperature, heat resistance, etc., by successively impregnating sheets of a substrate with an undercoating resin consisting of a phenolic resin precondensate, etc., drying the impregnated sheets, impregnating the dried sheets with an overcoating resin containing a specific amount of antimony pentoxide, drying the obtained sheets, laminating and molding the resultant sheets of prepreg. CONSTITUTION:Sheets of a substrate are impregnated with an undercoating resin obtained by blending a phenolic resin precondensate with melamine resin and dried. The dried sheets are then impregnated with an overcoating resin prepared by blending antimony pentoxide sol in an amount of 2-20wt.%, preferably 3-10wt.% expressed in terms of solid in an oil-modified phenolic resin containing a flame-retardant resin and dried to provide sheets of prepreg, which are subsequently laminated and molded. |
