Process for preparing positive or negative lithographic printing

Details Process for preparing positive or negative lithographic printing Process for preparing positive or negative lithographic printing

1990-05-01

1992-06-30

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

430175, 430176, 430309, 430326, 430331, 430325, G03F 732, G03F 7021, G03F 7022

Patent

active

051262290

ABSTRACT:
A developer composition comprises an aqueous alkaline solution which contains at least one alkali-soluble mercapto compound and/or thioether compound. The developer composition is excellent in developing properties and provides lithographic printing plates which do not cause background contamination of non-image areas during printing, when it is used in developing PS plates. It can be stored for a long time. The developer composition further makes it possible to develop both negative and positive working PS plates if its pH value is not less than 12.

REFERENCES:
patent: 3474719 (1969-10-01), Levinos
patent: 3864131 (1975-02-01), Tanaka et al.
patent: 4299912 (1981-11-01), Shiba et al.
patent: 4361639 (1982-11-01), Kanada et al.
patent: 4370404 (1983-01-01), Tachikawa et al.
patent: 4467027 (1984-08-01), Yamamoto et al.

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