Positive acting composition yielding pre-development high visibi

Details Positive acting composition yielding pre-development high visibi Positive acting composition yielding pre-development high visibi

1981-06-15

1982-09-07

Bowers, Charles L.

Radiation imagery chemistry: process, composition, or product th

Diazo reproduction, process, composition, or product

Composition or product which contains radiation sensitive...

430190, 430191, 430192, 430292, 430326, G03C 154, G03C 160, G03F 708

Patent

active

043484719

ABSTRACT:
A colored, positive-acting, radiation-sensitive composition whose color is extinguished or greatly decreased in intensity upon irradiation comprising at least one acid-free resin, at least one acid-sensitive dyestuff and at least one positive-acting component which yields an acidic product upon irradiation; positive-acting elements comprising suitable support materials at least one surface of which has been coated with the above composition and lithographic printing plates comprising the above elements, wherein the support materials are lithographically suitable support materials, which have been imagewise exposed to radiation wherein there is a high contrast, before development, between the colored image areas and less intensely colored or colorless non-image areas, the image areas of said plates being additionally highly stable against aqueous alkaline developers after development to remove the exposed non-image areas of the composition and more highly colored than the non-image areas of the revealed substrate surface.

REFERENCES:
patent: 3969118 (1976-07-01), Stahlhofen et al.
patent: 4163672 (1979-08-01), Stahlhofen
patent: 4173470 (1979-11-01), Fahrenholtz et al.

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