Patent ID: 6806033
Filing Date: 2004-10-19
Classification: C08G,G03F,H01L,H05K

Abstract:
The process of making a photoimaged dielectric having a glass transition temperature of at least about 140Â° C., comprising the steps ofa) preparing a resin mixture of a polyfunctional epoxy resin comprising triglycidyl ether of tris (hydroxy phenyl), and the condensation product of the bisphenol and epihalohydrin comprising a diglycidyl ether of a bisphenol A, b) incorporating into the mixture up to 10 PHR of a third epoxy resin capable of improving the flex fatigue life of the dielectric without lowering the glass transition temperature of the dielectric below about 140Â° C., c) incorporating an effective amount of a curing agent comprising a cationic photoinitiator into the mixture, d) exposing at least a portion of the mixture to a source of actinic radiation, and e) further processing the resin mixture to crosslink the exposed portion of the resin mixture.