Developing method for printing plates for waterless offset print

Details Developing method for printing plates for waterless offset print Developing method for printing plates for waterless offset print

1988-05-11

1990-10-16

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

430162, 430175, 430309, 430331, G03F 7021, G03F 732

Patent

active

049634720

ABSTRACT:
A developing method for printing plates employing waterless offset processes is disclosed. The plates comprise a support coated with a photosensitive layer based on a diazonium salt polycondensation product and a super-imposed ink-repellent, crosslinked silicone elastomer layer, whereby said developer is characterized in that it contains a predominant proportion of compounds of the general formula R--(O--CH.sub.2 --CH.sub.2 --).sub.n --O--R, where R denotes C.sub.m H.sub.2m+1, n denotes an integer from 1 to 25 and m denotes an integer from 1 to 5. The present invention is particularly suitable for developing printing plates where the photosensitive layer comprises a diazonium salt polycondensation product comprising recurrent A--N.sub.2 X and B units which are mutually linked by bridge members, especially methylene groups, which are derived from carbonyl compounds capable of condensation, A being the radical of an aromatic diazonium compound capable of condensation with formaldehyde, and B being the radical of a compound which is free of diazonium groups and is capable of condensation with formaldehyde, particularly of an aromatic amine, a phenol, a phenol ether, an aromatic thioether, an aromatic hydrocarbon, an aromatic heterocyclic compound or an organic acid amide.

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English Abstract of West Germany Pat. No. 3,543,961, published 6/1986.

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