Copper phthalocyanine pigment process
US4386966A · kind A · utility
3Cited by
4References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1981 |
| Grant date | Jun 7, 1983 |
| Priority date | — |
| Expiry date | Dec 14, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0019
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Premilled semichloro copper phthalocyanine or partially sulfonated semichloro copper phthalocyanine is slurried and stirred with sulfuric acid (50-60% and preferably 55-59% in the case of semichloro copper phthalocyanine and 50-61% and preferably 58-61% in the case of partially sulfonated semichloro copper phthalocyanine) at 50.degree.-85.degree. C., preferably 65.degree.-75.degree. C. for 1/2 to 4 hours. The slurry is diluted with to less than 35% sulfuric acid concentration and stirred at 60.degree.-95.degree. C. for 1/2 to 4 hours. The resulting highly transparent pigment is filtered and dried.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.