Process for the preparation of cationic naphtholactam dyestuffs
US4283540A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 1978 |
| Grant date | Aug 11, 1981 |
| Priority date | — |
| Expiry date | Sep 18, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B57/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Water-soluble cationic dyestuffs are prepared by the reaction of dyestuffs of the formula ##STR1## wherein R and R.sub.1 represent alkyl, PA1 R.sub.2 represents alkyl, aralkyl, cycloalkyl or aryl or represents alkylene which is bonded to the ring A in the o-position relative to the nitrogen atom, and An.sup.- represents an anion, and wherein the said radicals, the ring A and the naphthalene ring can contain nonionic substituents customary in dyestuff chemistry, and wherein at least one of the radicals R and R.sub.1 contains a hydroxyl group or a halogen atom or another group which can be split off as an anion, with polyhydric alcohols in the presence of a catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.