Patent ID: 6558512
Filing Date: 2003-05-06
Classification: B32B,D21H,H05K,Y10T

Abstract:
A process for producing a prepreg comprising the steps of:(1) preparing a non-woven fabric comprising para-aramid fibers made by a wet type paper-making process; (2) incorporating a thermosetting resin binder into said non-woven fabric, to prepare a binder-containing non-woven fabric sheet comprising 95 to 70 mass % of the para-aramid fibers and 5 to 30 mass % of the thermosetting resin binder, based on the total mass of the para-aramid fibers and the thermosetting resin binder; (3) drying said binder-containing non-woven fabric sheet at 140 to 200Â° C.; (4) heating a plurality of said binder-containing non-woven fabric sheets together under pressure at a temperature of 30Â° C. or higher than the drying temperature in step (3) and up to 400Â° C., so as to integrate said plurality of said binder-containing non-woven fabric sheets, thereby preparing a base material; and (5) impregnating said base material or base materials with a thermosetting varnish and drying the same.