Patent ID: 6835533
Filing Date: 2004-12-28
Classification: G03F,H05K,Y10T

Abstract:
A photoimageable dielectric epoxy resin system film comprising:a. from about 5 to 80% of phenoxy polyol resin which is the condensation product of epichlorohydrin and bisphenol A, having a molecular weight of from about 40,000 to 130,000; b. from about 0 to 90% of an epoxidized multifunctional bisphenol A formaldehyde novolac resin having a molecular weight of from about 4,000 to 10,000; c. from 20% to 50% of a diglycidyl ether of bisphenol A having a molecular weight of from about 600 to 2,500; d. less than 15% of a cationic photoinitiator; c. from about 15% to about 35% liquid epoxy resin, having a molecular weight of from about 200 to about 600; and f. from 0% to about 30% of a rheology modifier, and less than about 3% solvent.