PREPREG, LAMINATED PLATE AND METALLIC FOIL-COATED LAMINATED PLATE

摘要

PROBLEM TO BE SOLVED: To improve flame retardancy, tracking resistance, insulation resistance and water absorption by impregnating a paper base material into a resin varnish for a first coat containing a water-soluble phenol resin and a nitrogen-containing water-soluble resin followed by impregnating a thermosetting resin varnish. ;SOLUTION: A paper base material is impregnated into a resin varnish for a first coat having 8-15 wt.% of nitrogen content in a solid water-soluble resin composed of a water-soluble phenol resin and a nitrogen-containing water-soluble resin in a molecule so that an adhesive amount of the first coat resin becomes 10-25 wt.% after drying, followed by drying. Next, the paper base material is impregnated into a resin varnish for a final coat composed of a thermosetting resin varnish such as a phenol resin, an epoxy resin, a melamine resin and an unsaturated polyester resin so that the total adhesive amount with the resin varnish for the first coat becomes 45-60 wt.%, preferably 50-55 wt.% after drying, followed by drying.;COPYRIGHT: (C)2000,JPO