Lithographic printing precursor and method of making a...

Details Lithographic printing precursor and method of making a... Lithographic printing precursor and method of making a...

B - Operations, Transporting

41

C

B41C 1/00 (2006.01) B41C 1/10 (2006.01) B41N 1/08 (2006.01) B41N 3/03 (2006.01) C09D 11/00 (2006.01)

Patent

CA 2507559

A method of preparing offset lithographic plates using specially formulated aqueous ink jet inks is described. The inks may either be pigment based and provide oleophilic images on specially formulated hydrophilic plate surfaces, or may contain chemical switches which provide the image on the plate by causing its surface to switch from hydrophilic to oleophilic or vice-versa. The lithographic printing plates comprise a coating, said coating comprising polyvinyl alcohol, polyacrylic acid, hydrophobic water-based amulsion with a PH of 7 or below aminoplast and a teast one metting agent.

L'invention concerne un procédé de préparation de plaques lithographiques décalées au moyen d'encres pour jet d'encre aqueuses spécialement préparées. Ces encres peuvent être à base de pigment et engendrer des images oléophiles sur des surfaces de plaques hydrophiles spécialement préparées ou elles peuvent renfermer des permutations chimiques permettant de produire l'image sur la plaque, pour ce faire, la surface de la plaque passe d'un état hydrophile à un état oléophile ou inversement.

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