Controlling ink diffusion in watercolor copying

Details Controlling ink diffusion in watercolor copying Controlling ink diffusion in watercolor copying

1979-12-21

1982-03-30

Coughenour, Clyde I.

Printing

Planographic

Lithographic plate making, and processes of making or using...

106 145, 106 19, 106208, 428914, 252316, B41M 506, C08L 512

Patent

active

043218709

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.

REFERENCES:
patent: 478892 (1892-07-01), Schwartz
patent: 1386995 (1921-08-01), Dorel
patent: 2013584 (1935-09-01), Schwanhausser
patent: 2294429 (1942-09-01), Stutz
patent: 2677700 (1954-05-01), Jackson
patent: 2893890 (1959-07-01), Harvey
patent: 3336244 (1967-08-01), Rockoff
patent: 3506749 (1970-04-01), Weissman
patent: 3559576 (1971-02-01), Vrancken
patent: 3853797 (1974-12-01), Pelzig

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