Method of treating lithographic printing plates with 2-propoxyethanol
AssigneeAmerican Hoechst Corporation
InventorJohn E. Walls
Life of this patent
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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.
Claims12
The method of developing a lithographic printing plate having resin binders in photosensitive coatings adherent thereupon, comprising treating said printing plate with a solution comprising 2-propoxyethanol as a detackifying agent, to remove the nonimage portions.
A method for simultaneously developing and finishing a lithographic printing plate having resin binders in photosensitive coatings adherent thereupon, comprising treating said printing plate with an aqueous solution comprising a detackifying agent comprising 2-propoxyethanol to remove the nonimage protion and impart oleophilicity to the image and hydrophilicity to the nonimage portions of said printing plate.
Dependencies are inferred from the claim text.