Method and composition for obtaining image reversal in epoxy for

Details Method and composition for obtaining image reversal in epoxy for Method and composition for obtaining image reversal in epoxy for

1992-09-10

1993-11-30

Kight, III, John

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430326, 430917, C03C 1725

Patent

active

052664449

ABSTRACT:
A method and composition are shown for producing a positive-acting photoimagible epoxy resin. In addition to the epoxy resin, the compositions include a dual component cross-linking system which combines a basic curing agent with an onium or arylonium salt. The onium or arylonium salt produces a protic acid upon exposure to irradiation causing a reaction with the basic curing agent which renders the agent ineffective as an epoxy curing agent during subsequent heating. During a subsequent bake operation, only the unexposed regions of the epoxy will cross-link. As a result, the exposed areas wash away, leaving only the cured reverse image.

REFERENCES:
patent: 4054451 (1977-10-01), Schlesinger et al.
patent: 4216288 (1980-08-01), Crivello
patent: 4299911 (1981-11-01), Ochi et al.
patent: 4439517 (1984-03-01), Irving
British Patent Specification 1 330 100.
Abstract of European Patent 0 295 211.
Abstract of European Patent 3 108 881.

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