Color developers for pressure-sensitive or heat-sensitive recording papers
US4531139A · kind A · utility
9Cited by
6References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 21, 1983 |
| Grant date | Jul 23, 1985 |
| Priority date | — |
| Expiry date | Oct 21, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/3336
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A color developer for use in pressure-sensitive or heat-sensitive recording papers comprise N-monosubstituted sulfonamides which contain at least one electron-withdrawing group within five atoms of the amido group of the sulfonamide. The N-monosubstituted sulfonamide may be in the form of an N-substituted, N'-mono or di-substituted sulfamide, or a polyfunctional molecule containing such an N-monosubstituted sulfonamide as the functional or impeding group thereof. The maximum color developing potential is realized when these compounds are used in conjunction with a source of metal or metal compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.