Patent ID: 6420441
Filing Date: 2002-07-16
Classification: C08J,H05K,Y10S

Abstract:
A method of preparing porous dielectric materials comprising the steps of:a) dispersing removable cross-linked polymeric porogen particles having a mean particle size of 1 to 200 nm in a polymerizable B-staged dielectric material; b) curing the B-staged dielectric material to form a dielectric matrix material without substantially degrading the porogen particles; and c) subjecting the dielectric matrix material to conditions which at least partially remove the porogen particles to form a porous dielectric material without substantially degrading the dielectric material; wherein the porogen particles are soluble in the B-staged dielectric material, wherein the polymeric porogen particles contain from 1 to 100% cross-linking agent based on the weight of the porogen and wherein the porogen particles are not reacted with the B-staged dielectric material.