Aluminum lithographic plate with visible image and process

Details Aluminum lithographic plate with visible image and process Aluminum lithographic plate with visible image and process

B - Operations, Transporting

41

N

96/257

B41N 1/08 (2006.01)

Patent

CA 1162788

ABSTRACT OF THE DISCLOSURE The disclosure describes a lithographic printing plate comprising an aluminum surface which has been treated to render it hydrophilic and negatively charged coated simultaneously or sequentially with a light sensitive, cationic, positively charged diazonium material and a cationic dye. The coated surface is capable of having its solubility altered upon exposure to actinic light and there- after developed to produce a visible, dyed image and a hydrophilic background free of the diazonium material and dye. Also described is a process which comprises coating an aluminum surface which has been treated to render it hydrophilic and negatively charged, simultaneously or sequentially, with a light sensitive, cationic, positively charged diazonium material and a cationic dye, selectively exposing the coated surface to actinic light to alter the solubility of the diazonium material, and developing the exposed coated surface to produce a visible, dyed image and a hydrophilic background free of the diazonium material and dye.

422070

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