Developer for printing plates
AssigneeBorden, Inc.
InventorJohn Nicholas Kirch
Life of this patent
Estimating the term…
Abstract
This composition includes 50 to 85% by weight water, 10 to 25% relatively non-volatile inert organic solvent, 0.1 to 5% of a medium foamer detergent and 5 to 15% of a N-alkyl-2-pyrrolidone lubricant.
Claims9
Developer composition for developing an exposed photosensitive coating on a substrate to remove therefrom non-image areas comprising, on weight basis, 50 to 85% water;
- 10 to 25% relatively non-volatile solvent selected from C.sub.1 to C.sub.6 alkyl alcohols, Cellosolve, Cellosolve acetate, butyl Cellosolve, methyl Cellosolve, and mixtures thereof;
- 0.1 to 5% of a detergent selected from the group consisting of nonionic, anionic and cationic detergents of the mild variety;
- and 5 to 15% of a pyrrolidone lubricant.
Developer composition comprising, on weight basis, 74% water;
- 14% organic solvent selected from cellosolve and cellosolve acetate;
- 2% detergent selected from the group consisting of nonionic, anionic and cationic detergents of the mild variety;
- and 10% N-methyl-2-pyrrolidone.
Developer composition for developing on a substrate an exposed photosensitive coating containing halogenated polyester, organic polyacrylate, metal acrylate and a photoinitiator, said composition comprising 50 to 85% water;
- 10 to 25% relatively non-volatile solvent selected from C.sub.1 to C.sub.6 alkyl alcohols, Cellosolve, Cellosolve acetate, butyl Cellosolve, methyl Cellosolve and mixtures thereof;
- 0.1 to 5% of a detergent selected from the group consisting of nonionic, anionic and cationic detergents of the mild variety;
- and 5 to 15% of a pyrrilidone lubricant;
- said photosensitive coating is hardened on exposure to light to form an image in the clear areas of negative transparency through which light passes to cause a reaction in the lightsensitive coating although other areas remain unaffected where light is blocked and is thus prevented from affecting the light sensitive coating.
Dependencies are inferred from the claim text.