Method for preparing organic pigments
US6440207B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 2000 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Mar 3, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2650/50
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention relates to a process for preparing dispersible organic pigments by(a) milling a mixture containing(1) one or more organic pigments,(2) at least about 1% by weight, relative to the organic pigment, of one or more aromatic polyalkylene oxide dispersants,(3) 0 to about 10 parts by weight, relative to the organic pigment, of a milling liquid in which the organic pigment is substantially insoluble,(4) 0 to about 50% by weight, relative to the organic pigment, of one or more milling additives other than dispersant (2), and(5) 0 to about 20% by weight, relative to the organic pigment, of one or more surface treatment additives;(b) optionally, adding to the milled pigment(6) one or more liquids in which the organic pigment is substantially insoluble in amounts such that the total solids content is not reduced below about 10%, and(7) one or more multivalent metal salts and/or one or more quaternary ammonium salt; and(c) isolating the milled organic pigment
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.