Pigment based inks for reliable high speed inkjet printing
US8348411B2 · kind B2 · utility
13Cited by
8References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2009 |
| Grant date | Jan 8, 2013 |
| Priority date | — |
| Expiry date | Apr 25, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/322
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An aqueous ink composition having at least one of dispersed pigments and anionic charged polymer, and further including a lower level, relative to the concentration of pigment and anionic charged polymer, of a polyvalent metal oxide particle dispersion, wherein the ink composition has a pH of greater than 4 and the polyvalent metal oxide particles have a negative zeta potential at the pH of the ink composition. These ink compositions are effective in reducing the damage and failure of silicon-based inkjet print heads caused by ink-induced dissolution and stress cracking of the silicon-based materials found in the print heads.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.