Chromogenic compositions containing stabilized phenolic coupler compounds, recording materials and processes utilizing same
US4439512A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1982 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | Nov 18, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/913
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Phenylurethane compounds formed by the reaction between a phenolic coupler compound and an organic isocyanate compound are utilized to form phenolic coupler compounds in situ in order to react with chromogenic compounds present in the sensitive layer of recording or reproducing materials. The phenolic coupler compounds can also be stabilized by blocking the phenolic hydroxyl with carbonate, an alkyl ether, organosilylated ether or organophosphoric acid ester, some of which are novel compounds. These stabilized derivatives of the stabilized phenolic coupler compound will decompose by application to sufficient thermal energy or suitable liquid or gaseous fluid to form the phenolic coupler compound in situ. The phenolic coupler compound is formed in situ by applying thermal energy to the sensitive layer or by applying to the sensitive layer a liquid or gaseous fluid which is able to decompose the stabilized phenolic coupler compound and release the phenolic coupler compound. Preferred chromogenic compounds include spiropyrans, triphenylmethane derivatives, ferric salts, non-photosensitive silver salts and diazonium compounds. Use in a diazo process is particularly beneficial. Sensitiv…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.