Process for producing polyhalogenated phthalocyanine
US5286855A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1991 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Nov 7, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B47/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for producing a polyhalogenated phthalocyanine containing not more than 0.02 part by weight of water-insoluble inorganic impurities derived from aluminum chloride per 100 parts by weight of phthalocyanine before halogenation, which comprises the following steps A, B and C; PA0 step A of halogenating phthalocyanine in titanium tetrachloride in the presence of aluminum chloride, PA0 step B of evaporating titanium tetrachloride and sublimating aluminum chloride by heating the halogenation reaction mixture, thereby recovering aluminum chloride as a mixture with titanium tetrachloride and obtaining a polyhalogenated phthalocyanine, and PA0 step C of recycling aluminum chloride isolated from the mixture with titanium tetrachloride or said mixture to the step A.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.