Diazo lithographic printing plate developing process

Details Diazo lithographic printing plate developing process Diazo lithographic printing plate developing process

1981-06-17

1983-07-05

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

430146, 430175, 430309, 430331, G03F 708

Patent

active

043918972

ABSTRACT:
Process for removing unexposed diazo from a silicated aluminum lithographic printing plate having a hydrophilic, anionic, negatively charged surface and a layer of a light sensitive, cationic diazo material which has been selectively exposed to actinic light in an image area. The plate is contacted after exposure with a solution of an anionic material in water. Anionic material from the solution ionically couples with unexposed diazo material and the solution still containing anionic material dissolves the coupled product from the unexposed areas producing a clean, hydrophilic background.

REFERENCES:
patent: 2714066 (1955-07-01), Jewett
patent: 2826501 (1958-03-01), Hodgins
patent: 3091533 (1963-05-01), Hodgins
patent: 3660097 (1972-05-01), Mainthia
patent: 3669660 (1972-06-01), Golda et al.
patent: 3751257 (1973-08-01), Dahlman
patent: 3891439 (1975-06-01), Katz et al.
patent: 4186006 (1980-01-01), Kobayashi et al.

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