Radiation imagery chemistry: process – composition – or product th – Diazo reproduction – process – composition – or product – Diazo-type process – i.e. – producing dye image by reacting...
Patent
1979-08-14
1981-02-24
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Diazo reproduction, process, composition, or product
Diazo-type process, i.e., producing dye image by reacting...
430148, 430151, 430163, 430157, 430177, 430178, 430181, 430341, 430344, 430336, G03C 158, G03C 518, G03C 1727
Patent
active
042528844
ABSTRACT:
Negative-working diazography material is comprised of (i) at least one diazonium compound, (ii) at least one acid labile enolic, preferably phenolic blocked-coupler adapted to be converted in the presence of acid to an active azo-coupling component, and (iii) at least one light-sensitive acid progenitor. The diazonium compound can itself concurrently function as the acid progenitor, e.g., when complexed with a Lewis acid. Upon imagewise exposure to light, acid catalyst is photochemically liberated, thus unblocking coupler molecules such that dye image forms under alkaline developing conditions only where the material has been irradiated.
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Bowers Jr. Charles L.
James River Graphics Inc.
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