C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
400/1326, 96/189
C09K 3/00 (2006.01) G03C 5/38 (2006.01) G03F 7/02 (1980.01)
Patent
CA 1111980
Abstract of the Disclosure An aqueous solution is provided which is suitable for use as a desensitizing gum for treating imaged litho- graphic printing plates, comprising (1) water, (2) an active polymer component for rendering non-image areas of a lithographic printing plate hydrophilic, comprised of a polyacrylamide-based polymer or copolymer or a blend of polyacrylamide and polyacrylic acid, or the like, said polymer or copolymer or blend having an average molecular weight of from 5,000 to 106 and having from 3 to 7 percent of the carbonyl sites as carboxyl groups, said active polymer component being present in an amount of from 3 to 30 weight percent of active polymer component, based on the weight of the active polymer component and the water, and (3) a suitable polyoxyalkylene glycol in an amount which is effective to reduce tackiness while the compo- sition, said polyoxyalkylene glycol being selected from printing properties of a plate treated with said compo- sition, said polyoxyalkylene glycol being selected from the group consisting of (a) a polyethylene glycol with an average molecular weight of at least 200, (b) a poly- propylene glycol with an average molecular weight of at least 200; (c) a mixture of components from (a) and (b); (d) a triether of glycerine with a mixture of polypro- pylene and polyethylene oxides, and (e) a triether of glycerine with polypropylene oxides. The solution is particularly suited for treating imaged lithographic printing plates since, unlike earlier solution, it does not go through a tacky state when drying.
320605
Smart & Biggar
The Dow Chemical Company
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