Negative-working diazo type photoreproduction having improved pH control
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United States of America Patent
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Dec 22, 1981
Grant Date -
N/A
app pub date -
Jun 18, 1980
filing date -
Jun 18, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Negative-working diazography formulation is comprised of (i) at least one hexafluorophosphate diazonium salt adapted to photolytically cleave into an acid catalyst, (ii) at least one acid labile enolic, preferably arylenolic blocked-coupler adapted to be converted in the presence of acid to an active azo-coupling component, and (iii) an effective amount of an additive, such as p-toluenesulfonyl benzamide, capable of controlling the pH of films prepared from said formulation when subjected to a clearing step as defined herein.
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