Photosensitive compositions containing a copolymer derived...

Details Photosensitive compositions containing a copolymer derived... Photosensitive compositions containing a copolymer derived...

G - Physics

03

F

96/179, 96/43

G03F 7/033 (2006.01)

Patent

CA 1105758

ABSTRACT OF THE DISCLOSURE A photosensitive resin composition comprising (I) a copolymer containing (A) 10 to 95 mol % of a conjugated diole- finic hydrocarbon, (B) 5 to 90 mol % of an .alpha.,.beta.-ethylenically un- saturated carboxylic acid and (C) 0 to 85 mol % of a monoolefini- cally unsaturated compound, (II) a photosensitizer and/or a photo- sensitive crosslinking agent, and, if necessary, (III) a photo- polymerizable unsaturated monomer. Said copolymer may have been reacted with an inorganic base, an alkali metal salt or an amine compound in a proportion of 0.05 to 1.0 equivalent per equivalent of the carboxyl group of the .alpha.,.beta.-ethylenically unsaturated car- boxylic acid in said copolymer. This photosensitive resin com- position is excellent in storage stability, quick in photosetting upon exposure to actinic light rays including ultraviolet rays, that is, high in sensitivity, capable of development with water or a dilute aqueous alkaline solution and possesses satisfactory rubber elasticity, and a printing plate formed from the composi- tion is excellent in water resistance though the composition is developable with an aqueous developing solution, so that the composition can be used for a flexographic printing plate, to which an aqueous flexographic printing ink can be applied.

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