Modification of chargeable pigment particles
US6235829A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 24, 1998 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Jul 24, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/90
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a method for making a non-polar suspension of chargeable pigment particles. A suspension of pigment particles is formed in a non-polar solvent, wherein the pigment particles are inherently ionic or are chargeable, and possess surface anchoring groups on the surface of the pigment particles. The pigment particles are contacted with a polymeric resin comprising a hydrophobic region that is soluble or solvatable in the non-polar solvent and a reactive group that reacts with the surface-anchoring groups on the surface of the pigment particle. The resultant coated pigment particles are stable in non-polar suspensions. In certain embodiments of the present invention, a covalent bond is formed between the pigment and the surface modifying polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.