Pressure-sensitive or heat-sensitive recording material
US4716424A · kind A · utility
4Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 13, 1983 |
| Grant date | Dec 29, 1987 |
| Priority date | — |
| Expiry date | May 13, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/3336
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A pressure- or heat-sensitive recording material which, in its color reactant system, contains as a color developer for the color former, at least one substituted resorcinol compound of the formula ##STR1## or a corresponding zinc or aluminium salt, in which R is a carboxyl- or aroyl-free substituent which has a positive Hammett para-sigma value and which is capable of forming, together with the adjacent hydroxyl group, an intramolecular hydrogen bond in the form of a six-membered ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.