Desensitizing gum for lithographic printing

Details Desensitizing gum for lithographic printing Desensitizing gum for lithographic printing

1985-07-29

1986-07-22

Kittle, John E.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

430302, 101451, 101465, 1014631, 106 2, G03F 700, B41N 300

Patent

active

046019740

ABSTRACT:
A desensitizing gum for a lithographic printing plate and a gumming up process thereof are disclosed. The gum is comprised of water having dispersed therein 5 to 35 wt %, based on the total weight of the gum, of a film-forming, water-soluble compound selected from the group consisting of enzyme-decomposed dextrine and enzyme-decomposed etherified dextrine. The desensitizing gum exerts a desensitizing action on non-image areas of a lithographic printing plate and does not cause image blinding of image areas even when the plate is stored for a long period of time.

REFERENCES:
patent: 3019106 (1962-01-01), Adams
patent: 3467537 (1969-09-01), Pickard
patent: 3619217 (1971-11-01), West
patent: 4213887 (1980-07-01), Walls et al.
patent: 4370404 (1983-01-01), Tachikawa et al.
patent: 4475460 (1984-10-01), Matsumoto
Davidson et al, Water-Soluble Resins, Van Nostrand Reinhold (1962), New York.
Strauss, The Lithographer's Manual, Waltwin Publishing Co. (1958), New York.

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