Patent ID: 6027858
Filing Date: 2000-02-22
Classification: G03F,H05K

Abstract:
A process of fabricating a laminate chip carrier containing a tented photoimageable dry film, said process comprising:(a) providing a dry dielectric film having a photoimageable epoxy based resin layer and a peelable polyester support layer, wherein said epoxy based resin layer comprises about 10% to about 80%, by weight, of a polyol resin which is a condensation product of epichlorohydrin and bisphenol A having a molecular weight of from about 40,000 to about 130,000; about 20% to about 90%, by weight, of an epoxidized multifunctional bisphenol A formaldehyde novolac resin having a molecular weight of from about 4,000 to about 10,000; about 0% to about 50%, by weight, of a halogenated epoxidized diglycidyl ether of bisphenol A having a molecular weight of from about 600 to about 2,500, and about 0.1 to about 15 parts by weight of the total weight of the epoxy resin system of a cationic photoinitiator;(b) vacuum laminating said photoimageable epoxy based resin layer of said dry dielectric film to at least one surface of a subcomposite having plated through holes therein wherein said dry dielectric film is stretched over said plated through holes during said laminating;(c) exposing the dry dielectric film of the structure provided in step (b) to a pattern of radiation under conditions effective to selectively harden portions of said photoimageable epoxy based resin layer, wherein said harden portions extend over one or more of said plated through holes; and(d) removing said peelable polyester support layer from said photoimageable epoxy based resin layer.