Positive-working light sensitive diazo materials with azo dye

Details Positive-working light sensitive diazo materials with azo dye Positive-working light sensitive diazo materials with azo dye

1980-02-19

1981-10-20

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Diazo reproduction, process, composition, or product

Composition or product which contains radiation sensitive...

430179, 430191, 430192, 430193, 430292, 430293, 430294, 430302, G03C 160, G03C 154

Patent

active

042961947

ABSTRACT:
A positive working light-sensitive composition comprises in admixture (a) a first component which is an azo dye formed by reacting a p-amino-benzene diazonium salt and a compound including the grouping ##STR1## and (b) a second component which includes a o-quinone diazide and/or a diazonium compound and which, on exposure to light produces an acidic light decomposition product which is capable of reacting with the azo dye to produce a material having a color different to that of the azo dye. The composition exhibits a color change on exposure to light and is useful for the manufacture of light sensitive plates for use in lithographic printing plate production.

REFERENCES:
patent: 3046115 (1962-07-01), Schmidt et al.
patent: 3046117 (1962-07-01), Sus
patent: 3373021 (1968-03-01), Adams et al.
patent: 3890152 (1975-06-01), Ruckert et al.
patent: 3929488 (1975-12-01), Smith
patent: 3969118 (1976-07-01), Stahlhofen et al.
patent: 3984253 (1976-10-01), Nelson
patent: 4163672 (1979-08-01), Stahlhofen et al.

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