Process for the preparation of highly chromatic perylene pigments
US6224665A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2000 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Jan 25, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0034
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention relates to a process for preparing perylene pigment compositions by reaction of PA0 (a) a perylene tetracarboxylic compound; PA0 (b) about 0.01 to about 20% by weight, relative to the perylene tetracarboxylic compound, of a non-pigmentary cyclic anhydride or imide of formula (I) ##STR1## PA1 wherein W is O or NR.sup.1 (where R.sup.1 is hydrogen, a metal, or optionally substituted alkyl, cycloalkyl, aralkyl, or aryl), R.sup.2, R.sup.3, and R.sup.4 are various combinations of substituents and/or fused-on rings, and the dotted line is an optional double bond representing R.sup.2 -C=C--R.sup.3 ; PA0 (c) ammonia or a primary alkyl, aralkyl, or aryl amine; PA0 optionally in the presence of PA0 (d) a solvent and/or PA0 (e) one or more dispersants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.