Preparation of phthalocyanine pigments
US5393339A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1994 |
| Grant date | Feb 28, 1995 |
| Priority date | — |
| Expiry date | May 11, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B47/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention relates to an improved process for preparing metal phthalocyanine pigments comprising PA1 (a) heating at a temperature of about 150.degree. C. to about 200.degree. C. a mixture comprising PA2 (i) a phthalocyanine-forming material based on phthalic acid, PA2 (ii) at least about 25 mole percent, relative to the phthalocyanine-forming material (i), of a metal donor, PA2 (iii) at least about 100 mole percent, relative to the phthalocyanine-forming material (i), of a nitrogen donor, PA2 (iv) 1 to about 20 percent by weight, relative to the phthalocyanine-forming material (i), of a catalyst, and PA2 (v) about 250 to about 400 percent by weight, relative to the phthalocyanine-forming material (i), of a di(C.sub.1 -C.sub.3 alkyl) phthalate solvent; and PA1 (b) isolating the metal phthalocyanine pigment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.