Aqueous 2-propoxyethanol containing processing composition for lithographic printing plates
AssigneeAmerican Hoechst Corporation
InventorJohn E. Walls
Life of this patent
Estimating the term…
Abstract
A developer suitable for machine and hand processing may now be made which accomplishes the aforementioned objects which is an aqueous solution comprising 2-propoxyethanol as a detackifying agent, an adjuvant solvent, a nonionic surfactant with a hydrophile-lipophile balance over about 17, and an inorganic salt. A developer/finisher may be prepared by adding thereto a water-soluble polymeric film former which is preferably polyvinyl pyrrolidone. A suspending agent, e.g. polyethylene glycol, is added to hand processing solutions.
Claims11
An aqueous developer for lithographic printing plates comprising in admixture
- (a) 2-propoxyethanol as a detackifying agent;
- (b) a nonionic surfactant having a hydrophile-lipophile balance greater than about 17;
- and
- (c) an inorganic salt.
An aqueous developer/finisher for lithographic printing plates comprising in admixture
- (a) 2-propoxyethanol as a detackifying agent;
- (b) a nonionic surfactant having a hydrophile-lipophile balance greater than about 17;
- (c) an inorganic salt;
- and
- (d) a water soluble polymeric film former.
Dependencies are inferred from the claim text.