Method for developing lithographic printing plates

Details Method for developing lithographic printing plates Method for developing lithographic printing plates

1992-07-23

1994-05-31

Dote, Janis

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

430302, 430325, 430331, 430175, 430176, 430157, G03F 730, G03F 732, G03F 7021

Patent

active

053168925

ABSTRACT:
A negative-working lithographic printing plate having a radiation-sensitive layer comprising a diazo resin, an acid-substituted ternary acetal polymer and an unsaturated polyester is developed with an aqueous developing composition comprising an organic solvent, an anionic surface active agent, sodium oxalate, sodium nitrate or an alkali metal tetraborate an aliphatic monocarboxylic acid, an aliphatic dicarboxylic acid and sufficient alkaline buffering system to provide an alkaline pH. The method effectively avoids problems of blinding and background sensitivity which are of critical concern in the printing art.

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