Processless direct write printing plate having heat sensitive crosslinked vinyl polymer with organoonium group and methods of imaging and printing
US6190830A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1999 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | May 11, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/368
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An imaging member, such as a negative-working printing plate, can be prepared using a hydrophilic heat-sensitive imaging layer comprised of a hydrophilic heat-sensitive, crosslinked vinyl polymer containing recurring organoonium groups. The imaging member can also include a photothermal conversion material such as carbon black or an infrared radiation absorbing dye. The heat-sensitive polymer has recurring units containing an organoammonium, organophosphonium or organosulfonium group that reacts to provide increased oleophilicity (ink receptivity) in response to heat. Heat is preferably generated by laser irradiation in the IR region of the electromagnetic spectrum. The heat-sensitive polymer is considered "switchable" in response to heat. The imaging member can be used in printing methods without the usual wet processing steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.