Enhanced imaging composition containing an azinium activator

Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making

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430286, 430287, 430919, 430920, 522 25, G03C 176

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active

047435283

ABSTRACT:
An imaging composition is disclosed comprised of an organic component containing ethylenic unsaturation sites and capable of selective hardening by addition at the sites of ethylenic unsaturation, an azinium salt activator, a photosensitizer having a reduction potential which in relation to the reduction potential of the azinium salt activator is at most 0.1 volt more positive, and an image enhancing amount of benzene substituted with an electron donating amino group and one or more groups capable of imparting a net Hammett sigma value electron withdrawing characteristic of at least +0.20 volt to said benzene ring.

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patent: 4576975 (1986-03-01), Reilly
Research Disclosure, vol. 200, Dec. 1980, item 20036.
Specht, Martic, and Farid, "A New Class of Triplet Sensitizers", Tetrahedron, vol. 38, pp. 1203-1211, 1982.

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