Patent ID: 6391932
Filing Date: 2002-05-21
Classification: C08J,H01L,H05K

Abstract:
A method of preparing porous polyimide dielectric materials comprising the steps of: a) dispersing removable cross-linked polymeric porogen particles in B-staged polyimide dielectic material to form B-staged polyimide dielectric matrix material; b) forming a film of the B-staged polyimide dielectric matrix material; c) curing the B-staged polyimide dielectric matrix material to form a polyimide dielectric matrix material; and d) subjecting the polyimide dielectric matrix material to conditions which at least partially remove the porogen particles to form a porous polyimide dielectric material without substantially degrading the polyimide dielectric material; wherein the porogen particles are soluble in the B-staged polyimide dielectric matrix material and wherein the porogen particles comprise as polymerized units at least one monomer capable of hydrogen-bonding with the B-staged polyimide dielectric matrix material.