Desensitizing compositions for lithographic platemaking and prin

Details Desensitizing compositions for lithographic platemaking and prin Desensitizing compositions for lithographic platemaking and prin

1975-01-31

1977-07-05

Welsh, M. J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 296WB, 260 296MP, 260 296H, C08L 3326

Patent

active

040339190

ABSTRACT:
A desensitizing composition comprises an aqueous solution comprising (i) a polymer containing structural units derived from acrylamide and from 1% by weight to 25% by weight of structural units containing carboxyl groups and (ii) desensitizing acidic material in an amount such that the pH of the solution is less than 5.5. The carboxyl group containing structural units may be derived from acrylic acid and/or an acrylic acid salt and the desensitizing acidic material may be phosphoric acid. The composition may be used as a substitute for gum arabic solution in lithographic plate making processes and lithographic printing processes.

REFERENCES:
patent: 3373021 (1968-03-01), Adams et al.
patent: 3560417 (1971-02-01), Pizzi
patent: 3619217 (1971-11-01), West
patent: 3734873 (1973-05-01), Anderson et al.
patent: 3761259 (1973-09-01), Arai et al.
patent: 3839500 (1974-10-01), Dexter
Merk Index, 5th Ed., Merk & Co., Rahway, NJ, 1940, p. 2.
Coupe, Science of Printing Technology, Cassell, London, pp. 90-95.

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