Pigment dispersions containing dispersants prepared by controlled radical polymerization having hydrophilic and hydrophobic segments
US6642301B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2002 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Aug 13, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/009
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A pigment dispersion comprising pigment, an aqueous carrier selected from water and a mixture of water and at least one organic solvent, and a pigment dispersant is described. The pigment dispersant is prepared by controlled radical polymerization, e.g., atom transfer radical polymerization, and has polymer chain structure represented by the following general formula I,&phgr;-(G)p-(E)s-T  IIn general formula I, G is a residue of at least one radically polymerizable ethylenically unsaturated monomer; E is a hydrophilic residue of at least one radically polymerizable ethylenically unsaturated monomer; G and E are different from one another; &phgr; is a hydrophobic residue of or derived from the initiator, and is free of said radically transferable group; T is or is derived from the radically transferable group of the initiator; p and s represent average numbers of residues occurring in a block of residues; p and s are each individually selected such that the pigment dispersant has a number average molecular weight of at least 250.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.