Crystal modification of a diketopyrrolopyrrole pigment
US5871575A · kind A · utility
7Cited by
10References
10Claims
0Family size
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Key dates
| Filing date | Aug 22, 1997 |
| Grant date | Feb 16, 1999 |
| Priority date | — |
| Expiry date | Aug 22, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0033
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A diketopyrrolopyrrole of formula ##STR1## in its .beta.-modification. The novel .beta.-modification is also suitable as pigment for coloring high molecular weight organic materials. In comparison to the .alpha.-modification, it has a shade shifting towards blueish red, enhanced color strength and chroma as well as an enhanced resistance to heat.
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