Radiation-sensitive compositions comprising a photocrosslinkable

Details Radiation-sensitive compositions comprising a photocrosslinkable Radiation-sensitive compositions comprising a photocrosslinkable

1991-03-27

1992-08-25

Hamilton, Cynthia

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430286, 430292, G03F 7038

Patent

active

051418428

ABSTRACT:
Radiation-sensitive compositions which are especially useful in the production of negative-working lithographic printing plates comprise a photocrosslinkable polymer, containing the photosensitive group ##STR1## as an integral part of the polymer backbone, and a print-out composition which produces an optical density difference upon exposure to activating radiation and thereby enables the exposed image on the printing plate to be seen before the plate is processed. The print-out composition comprises a leuco form of a dye having one or more removable hydrogen atoms, the removal of which forms a compound colored differently from the leuco form; a photooxidant which has a photoscissionable nitrogen-oxygen bond, the photooxidant serving to convert the leuco dye to the differently colored form when the composition is exposed to activating radiation; and a heteroaromatic amine N-oxide which functions to improve the photo-efficiency of the print-out composition and thereby increase the print-out density.

REFERENCES:
patent: 3359109 (1967-12-01), Harder et al.
patent: 3481739 (1969-12-01), Wainer et al.
patent: 3582342 (1971-06-01), Itano et al.
patent: 3615454 (1971-10-01), Cescon et al.
patent: 3827887 (1974-08-01), Hazy et al.
patent: 4251619 (1981-02-01), Kurita
patent: 4425424 (1984-01-01), Altland et al.

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