Recording material and process of using
US5196297A · kind A · utility
61Cited by
14References
45Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1986 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Dec 5, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/165
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to novel recording materials which employ color-forming di- and triarylmethane compounds possessing certain S-containing ring-closing moieties, namely, or thiolactone, dithiolactone or thioether ring-closing moiety and to a method of forming color by contacting these dye precursor compounds with a Lewis acid material capable of opening the thiolactone, dithiolactone or thioether ring-closing moiety whereby the compound is rendered colored, that is, converted to its chromophore color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.