Negative-working diazo type photoreproduction having improved pH

Details Negative-working diazo type photoreproduction having improved pH Negative-working diazo type photoreproduction having improved pH

1980-06-18

1981-12-22

Louie, Jr., Won H.

Radiation imagery chemistry: process, composition, or product th

Diazo reproduction, process, composition, or product

Diazo-type process, i.e., producing dye image by reacting...

430174, 430180, 430181, 430179, G03C 152

Patent

active

043071708

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.

REFERENCES:
patent: 3420665 (1969-01-01), Bialczak

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