Positive-working light sensitive diazo materials with azo dye
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United States of America Patent
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Oct 20, 1981
Issued Date -
N/A
app pub date -
Feb 19, 1980
filing date -
Apr 12, 1977
priority date (Note) -
Expired
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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.
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