Process of developing posi-type lithographic printing plate with

Details Process of developing posi-type lithographic printing plate with Process of developing posi-type lithographic printing plate with

1982-05-20

1984-08-21

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

430165, 430175, 430176, 430192, 430309, 430278, 430428, 430429, 430490, G03F 708

Patent

active

044670273

ABSTRACT:
A developer composition of an alkaline aqueous solution containing a reducing inorganic salt, typically an alkali metal salt of sulfurous acid such as sodium sulfite, is found to be applicable for development of a lithographic printing plate material containing a photosensitive o-quinonediazide compound and an organic polymer, with reduced deterioration in developing capacity caused by the air and enhanced stability with lapse of time. In particular, a developer composition composed of an alkaline aqueous solution of pH 11 or higher containing a water-soluble sulfurous acid salt is effective for developing both of a lithographic printing plate material having a nega-type photosensitive layer containing a photosensitive diazo compound and an organic polymer, and a lithographic printing plate material having a posi-type photosensitive layer containing an o-quinonediazide compound and an organic polymer.

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patent: 3868254 (1975-02-01), Wemmers
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patent: 4141733 (1979-02-01), Guild
patent: 4259434 (1981-03-01), Yamasue et al.
patent: 4294911 (1981-10-01), Guild

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