Protective overcoat useful for enhancing an article resistance to ambient humidity
US5997993A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1997 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Nov 20, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a lithographic printing plate precursor element capable of being used on a printing press immediately after imagewise exposure without the requirement of bath processing. A preferred embodiment has in order (a) a substrate; and (b) a photoresist photohardenable upon imagewise exposure to actinic radiation, the photoresist comprising (i) a macromolecular organic binder; (ii) a photopolymerizable ethylenically unsaturated monomer having at least one terminal ethylenic group capable of forming a high polymer by chain-propagated polymerization, and (iii) a polymerization initiator activatable by actinic radiation; and (c) an on-press removable polyphosphate-containing overcoat. The polyphosphate-containing overcoat imparts the plate with a non-tacky surface and an enhanced resistance to the adverse influence of ambient humidity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.