Use of S-119 in lithographic fountain solutions

Details Use of S-119 in lithographic fountain solutions Use of S-119 in lithographic fountain solutions

1981-08-03

1982-08-31

Lusignan, Michael R.

Stock material or miscellaneous articles

Composite

Of metal

252 792, 252 794, 252 795, 156639, 427384, 428532, 430302, 430309, 536 1, 536114, B32B 1504, C09K 1304, C09K 1306, C09K 1302

Patent

active

043472893

ABSTRACT:
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.

REFERENCES:
patent: 3276360 (1966-10-01), Stimson et al.
patent: 3489561 (1970-01-01), Pickard
patent: 4259451 (1981-03-01), Steenberger et al.

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