Inventors:
Barbara S. Zasloff - Rockville MD
International Classification:
B41M 506
C08L 512
Abstract:
A method for limiting the diffusion of ink through a planographic plate comprising a polymetric matrix containing liquid, as for example an agar matrix, is described. Incorporated in the matrix is a diffusion inhibitor which has a binding affinity for the water soluble dye comprising the ink. The additives are cationic or anionic surfactants and the dyes employed are anionic or cationic. When an anionic surfactant a cationic dye is used and vice-versa.