| 摘要 |
PURPOSE:To manufacture a laminated board having excellent drill-ability, dimensional stability and interlaminar strength, by impregnating a nonwoven glass cloth with a resin varnish containing cellulosic fiber and inorganic filler, combining the prepreg obtained by drying the above impregnated cloth with a glass cloth prepreg, and hot-pressing the laminate. CONSTITUTION:A resin varnish containing 100pts.(wt.) of solid resin component, 5-40pts. of cellulosic fiber and 40-100pts. of inorganic filler is impregnated and dried in a nonwoven glass cloth, and the obtained prepreg is combined with a glass cloth prepreg and hot-pressed to obtain the objective composite laminate. The cellulosic fiber is pretreated with a water-soluble phenolic resin or melamine resin. The inorganic filler is preferably one having low Mohs hardness.
|
