Process for preparing modified .beta.-quinacridone pigment
US5229515A · kind A · utility
12Cited by
12References
10Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 7, 1991 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Jun 7, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0027
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for preparing a modified beta quinacridone polytype having identified color space values which comprises the steps of dry pre-milling beta phase quinacridone, deaggregating the pre-milled product in an alcohol-base medium and ripening the deaggregated product in the presence of an oxidizing agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.