Synthesis of bis(phthalocyanylalumino)tetraphenyldisiloxanes
US5817805A · kind A · utility
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5References
18Claims
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Key dates
| Filing date | Feb 21, 1997 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Feb 21, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B47/067
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A cyan pigment, bis(phthalocyanylalumino)tetraphenyldisiloxane is prepared in a single reaction mixture. A phthalonitrile is reacted at high temperature with an aluminum salt in the presence of an ammonia donor such as urea, in an inert, high boiling organic solvent. The resulting reaction product is cooled and without isolation, refluxed in an aqueous solution of a pyridine compound containing dichlorodiphenylsilane. The desired cyan pigment is then isolated.
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