Lithographic printing plate and process

Details Lithographic printing plate and process Lithographic printing plate and process

B - Operations, Transporting

41

N

101/61

B41N 1/08 (2006.01) B41N 3/03 (2006.01) G03F 7/016 (2006.01) G03F 7/38 (2006.01)

Patent

CA 1155707

ABSTRACT OF THE DISCLOSURE Lithographic printing plate having (a) a substrate with a hydrophilic, anionic, negatively charged surface; (b) a layer on said surface of a light sensitive, cationic, positively charged diazonium material which: (i) when selectively and incompletely exposed to actinic light becomes adhered to the substrate in the exposed areas; and (ii) couples in situ after exposure when treated with an anionic material in a reaction medium to form a reaction product which is insoluble in the reaction medium in the exposed areas but soluble in the unexposed areas thereby simultaneously reinforcing the diazonium material in the exposed areas and removing coupled diazonium material from the unexposed areas.

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