| 摘要 |
<p>PURPOSE:To obtain a laminated board more excellent in capacities such as a high frequency characteristic, humidity resistance, insulating resistance, heat resistance and chemical resistance, in obtaining a resin impregnated laminated board for an electric use, by performing the impregnation of a resin in plural times and impregnating a specific resin at first. CONSTITUTION:In obtaining a laminated board for an electric use by laminating a predetermined number of resin impregnated substrates each of which is obtained by impregnating the substrate with a fluorocarbon resin and melting said resin under heating, the impregnation of the resin is performed in plural times and, at first, tetrafluoroethylene/hexafluoropropylene copolymer or a fluorocarbon resin containing 0.5wt% or more of said copolymer is impregnated in a predetermined resin amount. On and after a second time, a 100% tetrafluoroethylene resin is impregnated in a predetermined resin amount. Thus obtained laminated board for an electric use is good in the close bonding strength of the fluorocarbon resin and the substrates and extremely excellent in capacities such as high frequency characteristic, humidity resistance, insulating resistance, heat resistance and chemical resistance.</p> |
