Organic compounds -- part of the class 532-570 series – Organic compounds – Chalcogen in the nitrogen containing substituent
Reexamination Certificate
2001-10-24
2004-07-13
Raymond, Richard L. (Department: 1624)
Organic compounds -- part of the class 532-570 series
Organic compounds
Chalcogen in the nitrogen containing substituent
Reexamination Certificate
active
06762299
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is situated in the field of dioxazine pigments, especially the benzimidazolonedioxazines.
Benzimidazolonedioxazine pigments are described in DE-A-44 42 291, EP-A-0 911 337, DE-A-197 27 079, and GB-A-22 84 427, and feature shades of red to blue.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide dioxazine pigments having high color strengths, good dispersibility, good light stability, and good weather fastness. A further object is to provide dioxazine pigments with a particularly red hue.
It has been found that mixed crystals of different compounds of the formula (1) below surprisingly achieve these objects.
REFERENCES:
patent: 3929719 (1975-12-01), Pugin et al.
patent: 4986852 (1991-01-01), Dietz et al.
patent: 5035747 (1991-07-01), Dietz et al.
patent: 5565563 (1996-10-01), Kaul et al.
patent: 5708188 (1998-01-01), Hao et al.
patent: 6162261 (2000-12-01), Kempter et al.
patent: 44 42 291 (1995-06-01), None
patent: 197 27 079 (1999-01-01), None
patent: 0 321 919 (1989-06-01), None
patent: 0 704 497 (1996-04-01), None
patent: 0 889 046 (1999-01-01), None
patent: 0 911 337 (1999-04-01), None
patent: 2 284 427 (1995-06-01), None
Born Roland
Kempter Peter
Plueg Carsten
Schmidt Martin U.
Bisulca Anthony A.
Clariant GmbH
Raymond Richard L.
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