Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Patent
1981-05-11
1982-12-28
Brammer, Jack P.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
430913, 430916, 430920, 20415915, 20415918, 20415923, 252426, G03C 168
Patent
active
043662285
ABSTRACT:
A photopolymerizable composition, element and method of photopolymerizing the composition or element are disclosed wherein the composition comprises an addition polymerizable compound containing ethylenic unsaturation and a co-initiator including a photopolymerization activator and photosensitizer.
In one aspect of the invention, the photosensitizer is selected to be a coumarin having an absorption maximum between about 250 and about 550 nm, and a ##STR1## substituent in the 3-position wherein R.sup.1 is alkyl or alkenyl having 1-12 carbon atoms, or a carboxylic or heterocyclic group having 5-20 nuclear carbon and hetero atoms, the coumarin and the activator being present in an amount sufficient to provide, when the compound is coated, dried and exposed to a medium-pressure mercury light source, a speed which is at least about one-fifth that of the same composition coated, dried and exposed identically except with a co-initiator consisting of Michler's ketone and benzophenone.
In another aspect of the invention, the activator is selected to have the structure: ##STR2## wherein: J is --O--, --S-- or a carbon-to-carbon bond;
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Farid Samir Y.
Houle Conrad G.
Specht Donald P.
Brammer Jack P.
Eastman Kodak Company
Schmidt Dana M.
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