Color-developer for pressure-sensitive recording sheets
US4400492A · kind A · utility
12Cited by
18References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1981 |
| Grant date | Aug 23, 1983 |
| Priority date | — |
| Expiry date | Mar 24, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L61/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a color-developer for pressure-sensitive recording sheets, comprising a co-condensate of a reaction intermediate of a p-substituted phenol and a trifunctional or higher phenol, or a polyvalent metal salt of said co-condensate, said reaction intermediate being obtained by the reaction of said p-substituted phenol under acidic conditions with formaldehyde or a substance capable of generating formaldehyde.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.