Pigment dispersing agent and offset printing ink composition employing the same
US5000792A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1989 |
| Grant date | Mar 19, 1991 |
| Priority date | — |
| Expiry date | Jun 2, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K23/22
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A pigment dispersing agent comprising the reaction product of a polyester having a free carboxyl group, of which the acid value is in the range of from 10 to 60, with an amine compound of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are alkylene radicals which can be the same or different, each containing from 2 to 6 carbon atoms, and R.sub.3 is a radical of the formula CH.sub.3 -- or C.sub.2 H.sub.5 --, wherein said reaction being conducted in the range of from 0.8 to 1.0 of equivalent molar ratio of the amino groups having active hydrogen of said amine compound to the free carboxyl groups of said polyester. Application of the dispersing agent to nonaqueous paint or printing inks enables pigments to be dispersed in the vehicle at higher concentrations with low viscosity than in the prior art, and the dispersions thus obtained exhibit high coloring power and excellent storage stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.