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Elementis pigment patents Granular pigments



Published August 11, 2005
Elementis pigment patents Granular pigments
Patent No. U.S. 6,758,893 B2
Elementis Pigments has received a patent for a process for the preparation of granules of iron oxide or chromium oxide, that is comprised of mixing iron oxide or chromium oxide with about one-30% weight water to form a damp powder; pressure extruding the damp powder through at least one die containing numerous holes, thereby forming cylindrical extrudates; drying the extrudates, so that a final water content of the extrudates is less than approximately one percent weight; and crumbling some or all of the extrudates to form granules.



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