G - Physics – 03 – C
Patent
G - Physics
03
C
96/251
G03C 5/00 (2006.01) G03C 1/68 (1980.01)
Patent
CA 1054425
METHOD OF PRODUCING POSITIVE POLYMER IMAGES ABSTRACT OF THE DISCLOSURE Positive polymer images are produced on substrates having applied thereto a layer of photopolymerizable compo- sition containing (1) a non-gaseous ethylenically unsatur- ated compound capable of polymerization by free-radical initiated chain propagation, (2) a dinitroso compound which is a noninhibitor of free-radical polymerization and is photochemically converted by ultraviolet radiation to an inhibitor of free-radical polymerization, and (3) a photo- activatable organic free-radical generating system. These images are produced by imagewise exposing a portion of the photopolymerizable layer through a transparency bearing an opaque image to ultraviolet radiation that converts the di- nitroso compound to an inhibitor of free-radical polymeriza- tion, exposing a greater portion of the photopolymerizable layer, including the area exposed to the imagewise exposure radiation, to actinic radiation that activates the free- radical generating system but does not convert the dinitroso compound to an inhibitor of free-radical polymerization, whereby a positive polymeric image is formed in the areas not exposed to the imagewise exposure radiation.
218892
E.i. Du Pont de Nemours And Company
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