Process for preparing modified pigments
US7972428B2 · kind B2 · utility
2Cited by
32References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2006 |
| Grant date | Jul 5, 2011 |
| Priority date | — |
| Expiry date | Feb 25, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/64
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for preparing a modified pigment having attached at least one organic group is described. This process comprises the step of combining, in any order, a colored pigment, an aromatic amine, a base, and an aqueous medium to form a mixture, and then combining the mixture and a diazotizing agent to form the modified pigment. The aromatic amine comprises at least two carboxylic acid groups, preferably being vicinal. The resulting modified colored pigment can be used in an inkjet ink composition to produce printed images having good overall properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.