Lithographic printing forms
US6485890B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2001 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | May 18, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/165
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Thermally imageable lithographic printing plate precursors and heat-sensitive compositions for use in these printing plate precursors are disclosed. The compositions contain an aqueous developer soluble polymer, such as a phenolic resin; a compound that reduces the aqueous developer solubility of the polymer; and optionally, and infrared absorber. Examples of compounds that reduce the aqueous developer solubility of the polymer are those that contain at least one quarternized nitrogen atom, such as quinolinium compounds, benzothiazolium compounds, pyridinium compounds, and imidazoline compounds. On thermal imaging, the irradiated areas become more soluble in the aqueous developer and can be removed to form a positive image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.