Resin-impregnated fabrics laminated to metal foil.

摘要

A woven or nonwoven fabric made of a mixture of at least two of meta-aramid, polyethylene terephthalate and glass fibers is impregnated with a solution of an adduct of an epoxy resin and a copolymer of acrylonitrile and butadiene having carboxyl groups at both chaim ends; as a preliminary reaction product or mixed with another epoxy resin. A curing agent maybe included in the solution. The dried impregnated fabric is dried and a metal foil, e.g. of copper, is placed over at least one face of the fabric base and is laminated thereto by heat and pressure. The resultant laminate is usable as a printed circuit board and can be bent to a desired shape.