Continuous method of producing phthalocyanine pigment dispersions in organic solvent
US4522654A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1983 |
| Grant date | Jun 11, 1985 |
| Priority date | — |
| Expiry date | Dec 23, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0032
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A continuous method for producing a dispersion of phthalocyanine blue pigment in an organic solvent is disclosed. The method involves the following two steps: PA0 (A) mixing a phthalocyanine crude pigment at about 10 to 50% by weight with from about 5 to 20% by weight of surfactant in a binder containing an organic solvent, and PA0 (B) continuously pumping the blend of (A) through at least two shot mills in series in which the shot grinding media range in size from 0.1 to 2.5 mm. diameter and grinding the blend until the particle size of the crude is reduced to where the solvent dispersion has suitable pigment tinctorial strength for use in inks and coatings. The dispersion of blue pigment produced by this method is especially useful in paste inks and organic solvent-based coatings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.