Substractive developer for negative working lithographic plates

Details Substractive developer for negative working lithographic plates Substractive developer for negative working lithographic plates

1974-08-26

1976-05-04

Klein, David

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 33, G03F 702, G03C 534

Patent

active

039544729

ABSTRACT:
A subtractive developer for negative working lithographic plates comprising an aqueous solution of an alcohol, preferably n-propanol, a small quantity of ammonium sulfite, and polyvinylpyrolidone in the range of 0.05 - 0.12% by weight. The developer may also contain a small quantity of ammonium sulfate or ammonium chloride.

REFERENCES:
patent: 3669660 (1972-06-01), Golda et al.
patent: 3738850 (1973-06-01), Radell et al.
Kodak Databook-Processing, Chemicals & Formulas, 1954 (Fifth ed.)-"Reduces" pp. 56-59.

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