Process for conditioning organic pigments
US6013126A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1998 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Nov 25, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0014
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention relates to a process for conditioning organic pigments by PA1 (a) grinding a crude organic pigment at a temperature of about 0.degree. C. to about 100.degree. C. in the presence of (i) about 1 to about 10 parts by weight, relative to the organic pigment, of an inorganic salt and (ii) about 1 to about 5 parts by weight, relative to the organic pigment, of a liquid in which the organic pigment and salt are substantially insoluble, to form a pigment paste; PA1 (b) grinding the pigment paste at a temperature of about 0.degree. C. to about 100.degree. C. in the presence of about 0.05 to about 1 parts by weight, relative to the organic pigment, of a C.sub.8 -C.sub.10 alkanoic acid to form a treated pigment paste; PA1 (c) stirring the treated pigment paste with water or water containing an acid and/or an organic liquid to complete the conditioning of the organic pigment; and PA1 (d) isolating the conditioned organic pigment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.