Heteropolysaccharide s-119 in lithographic fountain solutions

Details Heteropolysaccharide s-119 in lithographic fountain solutions Heteropolysaccharide s-119 in lithographic fountain solutions

B - Operations, Transporting

41

N

6/6

B41N 3/08 (2006.01)

Patent

CA 1185053

TITLE OF THE INVENTION USE OF S-119 IN LITHOGRAPHIC FOUNTAIN SOLUTIONS ABSTRACT OF THE INVENTION Polysaccharide S-119 is used as a desensitizer in lithographic fountain solutions to maintain non-image areas on a lithographic printing plate in a hydrophilic condition in order to prevent scumming or ink pickup in said areas. S-119 is prepared in aqueous solution which is added to phosphoric acid etch in water plus alcohol to provide a gum concentration of 20 - 1000 ppm by weight in the fountain solution.

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