Intermediate coating compositions and long running planographic plates prepared therewith

Claim 1

A subbase coating composition for photolithographic plates comprising a salt formed from the reaction product of a water soluble polyacrylic resin containing carboxy groupings and a polyalkylenimine-urea-aldehyde resin, said polyacrylic resin being selected from the group consisting of polymers of acrylamide, hydrolyzed acrylamide, acrylic acids and salts thereof, and having a molecular weight range of from 10,000 to 200,000, wherein said polyalkylenimine-urea-aldehyde resin is a product made according to a process which comprises the steps of: a. heating and reacting a polyalkylenimine resin having the following general formula: ##STR2## wherein R 1 and R 2 are alike or different and are selected from the group consisting of hydrogen, lower alkyl, water and urea to form from about 10 to about 30 percent of a polyurea reaction product, while water and ammonia are removed; b. adding thereto and reacting additional urea; c. methylolating the reaction mixture with an aldehyde to form said polyalkylenimine-urea-aldehyde resin; wherein said salt is characterized by the reaction of carboxy groups of said polyacrylic resin with the tertiary amino groups of the polyalkylenimine resin.