Finely divided highly transparent diketopyrrolopyrrole pigments
US5476949A · kind A · utility
25Cited by
6References
22Claims
0Family size
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Key dates
| Filing date | Jul 21, 1994 |
| Grant date | Dec 19, 1995 |
| Priority date | — |
| Expiry date | Jul 21, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B57/004
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Finely divided 1,4-diketopyrrolo[3,4-c]pyrroles of the formula ##STR1## where A and B are each independently of the other a radical of the formula ##STR2## wherein at least 84% by weight of the particles have a Stokes equivalent diameter of .ltoreq.0.25 .mu.m, and mixtures thereof. The substituents R.sub.1 and R.sub.2 are defined in claim 1. These pigments are notable for a very pure hue and outstanding transparency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.