| 摘要 |
PURPOSE:To enhance resistance to tracking, resistance to flame, punchability and resistance to humidity by using melamine resin modified phenol resin blended with a flame retardant agent polyol of specified structure containing phosphorus to prepregs for surface layers and inner layers. CONSTITUTION:A fiber base is impregnated with varnish composed of melamine modified phenol resin of 5-20wt.% of melamine quantity to which polyol containing phosphorus represented by the Formula I and dried. Further the fiber base is impregnated with prepregs for surface layers prepared by impregnating the fiber base with flame retardant face coating resin and with melamine resin modified phenol resin having 10wt.% or more of melamine quantity and dried, on which prepregs for inner layers prepared by impregnating the fiber base with flame retardant face coating resin and dried is over lapped and heat pressurized. In the Formula I, R1 represents 1-4C alkyl and R2 and R3 represent 1-4C alkylene. A phenol resin laminate of superior resistance to flame, resistance to tracking, punchability and resistance to humidity can be manufactured by said process. |
