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AssigneeInternational Business Machines Corporation
InventorsNorman A. Card, Jr., Richard A. Day, Donald H. Glatzel, David J. Russell
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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 C. and about 110 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, and an effective amount of thixatropic agent. Optionally a photosensitizer such as perylene and its derivatives or anthracene and its derivatives may be added.
A photosensitive cationically polymerizable epoxy base imaging system comprising:
A photosensitive cationically polymerizable epoxy based imaging system comprising:
A photosensitive cationically polymerizable epoxy based imaging system comprising:
Dependencies are inferred from the claim text.