Process for the production of a lithographic printing plate of d

Details Process for the production of a lithographic printing plate of d Process for the production of a lithographic printing plate of d

1991-11-20

1993-09-07

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

To produce printing surface

430 96, G03G 5087

Patent

active

052427722

ABSTRACT:
According to the present invention, a lithographic printing plate of direct image type capable of preventing the occurrence of background stains and having good printing durability and a process for the production thereof are provided. The process comprises (a) forming an image on a lithographic printing plate precursor comprising a base and a light-insensitive image receptive layer provided on the base, wherein the image receptive layer comprises resin grains comprising at least one polymer component having (1) at least one of a functional group represented by at least one of Formula (I) and Formula (II): ##STR1## wherein --W.sub.1 -- and --W.sub.2 -- each respectively represents --SO.sub.2 --, --CO-- or --OOC--; n.sub.1 and n.sub.2 each respectively represents 0 or 1; and X represents a halogen atom, or (2) having at least one of a formyl group and a functional group represented by Formula (III): ##STR2## wherein R.sub.1 and R.sub.2, which are the same or different, each represents hydrocarbon groups or R.sub.1 and R.sub.2 are organic residual radicals which are combined with each other to form a ring and then (b) subjecting a non-image area other than the image area to oil-desensitizing treatment with a solution containing a hydrophilic compound containing a substituent having a Pearson's nucleophilic constant, n, of at least 5.5.

REFERENCES:
patent: 4971870 (1990-11-01), Kato et al.
patent: 5041348 (1991-08-01), Kato et al.

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