公开(公告)号：CA1334566C

公开(公告)日：1995-02-28

申请号：CA611439

申请日：1989-09-14

Applicant: IBM

Inventor： DAY RICHARD A ,  GELORME JEFFREY D ,  RUSSELL DAVID J ,  WITT STEVEN J

IPC: C08G59/00 ,  C08G59/20 ,  C08G59/30 ,  C08G59/62 ,  C08G59/68 ,  C08L63/00 ,  G03F7/038

Abstract: An improved photoimagable cationically polymerizable epoxy based coating material is provided. The material includes an epoxy resin system consisting essentially of between about 10% and about 80% by weight of a polyol resin which is a condensation product of epichlorohydrin and bisphenol A having a molecular weight of between about 40,000 and 130,000; between about 20% and about 90% by weight of an epoxidized octafunctional bisphenol A formaldehyde novolak resin having a molecular weight of 4,000 to 10,000; and if flame retardancy is required between about 35% and 50% by weight of an epoxidized glycidyl ether of tetrabromo bisphenol A having a softening point of between about 60.degree.C and about 110.degree.C and a molecular weight of between about 600 and 2,500. To this resin system is added about 0.1 to about 15 parts by weight per 100 parts of resin of a cationic photoinitiator capable of initiating polymerization of said epoxidized resin system upon exposure to actinic radiation; the system being further characterized by having an absorbance of light in the 330 to 700 nm region of less than 0.1 for a 2.0 mil thick film. Optionally a photosensitizer such as perylene and its derivatives or anthracene and its derivatives may be added.