Method for treating imaged lithographic printing plates

Printing – Planographic – Processes of lithographic printing

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Details

101457, 101465, 106 2, 260 296E, B41M 106

Patent

active

042468434

ABSTRACT:
A method for treating imaged lithographic printing plates with a solution 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 about 5,000 to about 10.sup.6 and having from about 3 to about 70 percent of the carbonyl sites as carboxyl groups, said active polymer component being present in an amount of from about 3 to about 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 composition is drying and which does not adversely affect the printing properties of a plate treated with said composition, said polyoxyalkylene glycol being selected from the group consisting of (a) a polyethylene glycol with an average molecular weight of about 200 to about 800; (b) a polypropylene glycol with an average molecular weight of about 200 to about 600; (c) a mixture of components from (a) and (b); (d) a triether of glycerine with a mixture of polypropylene 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 solutions, it does not go through a tacky state when drying.

REFERENCES:
patent: 3547632 (1970-12-01), Nadeau
patent: 3745028 (1973-07-01), Rauner
patent: 3829319 (1974-08-01), Suzuki et al.
patent: 4116896 (1978-09-01), Garrett et al.

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