Amphoteric dispersants and their use in inkjet inks
US7932306B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2008 |
| Grant date | Apr 26, 2011 |
| Priority date | — |
| Expiry date | Jul 28, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D153/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present disclosure provides a black ink-jet ink, having a pH greater than 7, comprising a first aqueous vehicle, a carbon black pigment, and an amphoteric polymeric dispersant, wherein the amphoteric polymeric dispersant is a block copolymer comprising an A block and a B block, wherein the A block is a segment consisting essentially of an amine monomer; and the B block is a segment comprising an acidic monomer and at least one hydrophobic monomer; wherein the dispersant is neutralized, and with the proviso that the acid number is greater that the amine number, and the B block does not contain an amine monomer. The disclosure further pertains to an ink set comprising this black ink and at least a second ink which contains a reactive species with appropriate cationic agent, salt, or pH capable of destabilizing the carbon black dispersion. Still further, the disclosure pertains to a method of printing wherein the black ink and second ink are printed in an adjacent relationship, thereby minimizing penetration, feathering and/or bleed of the black pigment and improving print quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.