Patent ID: 6258203
Filing Date: 2001-07-10
Classification: B32B,C08J,D21F,D21H,H05K,Y10S,Y10T

Abstract:
A method of producing a printed circuit board comprising:(a) using a foam-laid process for making non-woven fibrous webs to form a non-woven sheet or web comprising at least 50% by weight of a mixture of both fibrillated and straight acrylic fibers, and the balance at least one of substantially electrically non-conductive fibers, filler, and binder;(b) densifying the sheet or web from (a);(c) forming a printed circuit board layer using the sheet or web from (b);(d) combining the layer from (c) with other substantially electrically non-conductive layers; and(e) providing electrically conductive circuit elements on or between at least one of the layers from (c).