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US 4,539,287 AGranted
Process for improving the printing quality of photohardenable reproduction materials
AssigneeE. I. Du Pont de Nemours and Company
InventorsMario Grossa, Dieter H. Tigler, Hubert Weinert
Life of this patent
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Abstract
Process for improving the printing quality of photohardenable reproduction materials for the production of relief printing plates whose surface has been abraded before imagewise exposure, by filling in the abraded relief with the photohardenable material itself or with a thermoplastic binder.
Claims10
A process for improving the printing quality of dry photohardenable reproduction materials for the production of relief printing plates consisting essentially of
- (a) abrading the dry photohardenable surface of the material which consists essentially of a photopolymerizable or photocrosslinkable compound, a thermoplastic binder, and an initiator and/or an initiator system thereby forming a rough surface in the photohardenable material with grooves in the range of about 5 to 20 .mu.m depth.
- (b) smoothing the abraded dry photohardenable surface by filling in the abraded surface by a treatment taken from the group consisting of
- (1) heat and/or pressure treatment,
- (2) treatment with an organic solvent and/or solvent mixture for the thermoplastic binder of the photohardenable material, and
- (3) treatment with a thermoplastic binder dissolved in a solvent,
- the surface having a depth of grooves no greater than about 2 .mu.m after the treatment
- (c) exposing the smoothed surface imagewise to actinic radiation, and
- (d) removing the unexposed areas of the smoothed surface by liquid development.
5 more elements
Dependencies are inferred from the claim text.