Highly concentrated stable solutions of color-forming agents: for pressure-sensitive recording materials
US4783196A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1987 |
| Grant date | Nov 8, 1988 |
| Priority date | — |
| Expiry date | Feb 5, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/1366
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Highly concentrated stable solutions of color-forming agents of the general formula ##STR1## wherein x denotes hydroxyl, alkoxy, alkenyloxy, aralkoxy, cycloalkoxy, aryloxy, acyloxy, alkylamino, dialkylamino, acrylamino, aralkylamino or arylamino and PA0 R denotes alkyl, alkenyl or aralkyl, further isocyclic or heterocyclic rings can be fused onto the rings A, B, C and D and the cyclic and acyclic radicals and the rings A, B, C and D can carry further non-ionic substituents which are customary in dyestuff chemistry, or mixtures thereof, in water-insoluble organic solvents from the group comprising optionally chlorinated hydrocarbons, vegetable oils and phthalic acid esters are used for the preparation of pressure-sensitive recording materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.