Modified gamma-quinacridone pigment
US5223624A · kind A · utility
12Cited by
10References
3Claims
0Family size
Inventors
Key dates
| Filing date | Aug 22, 1991 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Aug 22, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0027
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A new gamma quinacridone polytype having a yellowish-red color and a distinct X-ray diffraction pattern, said new form being prepared directly in high yield in pigmentary form by oxidation of 6,13-dihydroquinacridone in a basic dimethylsulfoxide medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.