Patent ID: 6107357
Filing Date: 2000-08-22
Classification: C08J

Abstract:
A method for preparing a porous dielectric material, comprising:(a) admixing, in a suitable solvent, (i) a thermally labile porogen having a reactive site that enables covalent attachment to another molecular moiety, (ii) a thermally stable, low dielectric constant host polymer having a glass transition temperature T.sub.g, and (iii) a coupling agent effective to covalently bind to both the reactive site of the porogen and the host polymer;(b) heating the admixture to a temperature T.sub.C effective to couple the porogen to the host polymer via the coupling agent, whereby a polymeric matrix is formed in which the porogen is present as a discrete phase within a continuous phase formed by the host polymer; and(c) heating the polymeric matrix to a temperature T.sub.D effective to degrade the porogen without affecting the host polymer, thereby producing a dielectric material in the form of a porous structure, wherein T.sub.D is greater than T.sub.C but less than T.sub.g.