Subbing layers for use with thermographic materials
US6296999A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1998 |
| Grant date | Oct 2, 2001 |
| Priority date | — |
| Expiry date | Aug 20, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/91
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A substantially light-insensitive black and white thermographic material comprising a polymeric or polymer-coated support, a subbing layer on the support and on the same side of the support as the subbing layer a thermosensitive element containing a substantially light-insensitive organic silver salt, a reducing agent therefor in thermal working relationship therewith and a binder, wherein the subbing layer contains a binder, less than 20% by weight of silica and covalently bonded acid groups in the binder, if present, are either substantially present as free acid or substantially present as acid salts and has a leachable non-fluoro-halide ion content into water at room temperature over a period of 120 minutes of less than 0.6 mg/m.sup.2 ; and a process for producing the substantially light-insensitive thermographic material comprising the steps of: coating the support with a subbing layer-composition thereby forming the subbing layer; producing one or more aqueous coating compositions together containing the substantially light-insensitive organic silver salt, the reducing agent and the binder; and applying the one or more aqueous coating compositions to the same side of the suppo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.