Imaging cylinder containing heat sensitive thiosulfate polymer and methods of use
US6136503A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1999 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Mar 2, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/145
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An imaging member, such as a printing cylinder, is composed of a hydrophilic imaging layer formed from a heat-sensitive composition (for example, by spray coating) having a hydrophilic heat-sensitive polymer containing heat-activatable thiosulfate groups, and optionally a photothermal conversion material. Upon application of energy that generates heat, such as from IR irradiation, the polymer is crosslinked and rendered more hydrophobic. The exposed imaging member can be contacted with a lithographic printing ink and a fountain solution and used for printing with or without post-imaging wet processing. This imaging member is particularly useful for direct write imaging using IR lasers or thermal printing heads. In preferred embodiments, the imaging member is an on-press printing cylinder that is prepared, imaged and used on press.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.