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US 5,871,575 AGranted
Crystal modification of a diketopyrrolopyrrole pigment
AssigneeCiba Specialty Chemicals Corporation
InventorsThomas Ruch, Olof Wallquist
Life of this patent
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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.
Claims10
A diketopyrrolopyrrole of formula ##STR6## in its .beta.-modification, wherein the X-ray diffraction pattern consists of the following diffraction lines:
- ______________________________________ Interplanar spacings Double glancing angles Relative intensity (d values in .ANG.) (2 .O slashed.) % ______________________________________ 13.8817 6.362 100 4.9411 17.938 24 4.6743 18.971 26 4.5976 19.290 21 4.4193 20.076 11 3.3932 26.242 35 3.3195 26.836 33 3.0419 29.337 12. ______________________________________
Dependencies are inferred from the claim text.