Method for preparation of an anthraquinone colorant composition
US6861541B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 2004 |
| Grant date | Mar 1, 2005 |
| Priority date | — |
| Expiry date | Jan 15, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B1/325
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed herein is a method for producing a 1-[4-(biphenyl-4-carbonyl)]phenylaminonthraquinone colorant composition where the method comprises: reacting 4-halobenzoic acid with about 1 mole to about 4 moles of a halogenating agent per mole of said 4-halobenzoic acid to form a 4-halobenzoyl halide composition; reacting in the presence of a first catalyst composition, said 4-halobenzoyl halide composition with biphenyl, in a solvent, to form a 1-[4-(biphenyl-4-carbonyl)]halobenzene composition, and reacting in the presence of a second catalyst composition and an acid scavenger, said 1-[4-(biphenyl-4-carbonyl)]phenylaminonthraquinone with a 1-aminoanthraquinone, in a reaction medium comprising a dipolar aprotic solvent, to form said 1-[4-(biphenyl-4-carbonyl)]phenylaminoanthraquinone colorant composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.