US Patent:
20100064942, Mar 18, 2010
Inventors:
Terry J. Detrie - Washington PA, US
Raymond E. Barnes - Wadsworth OH, US
Jacqueline C. Livingston - Washington OH, US
Gary L. Nuccetelli - Scenery Hill PA, US
Richard A. Pipoly - Garfield Heights OH, US
Daniel R. Swiler - Washington PA, US
Lei Wang - Washington PA, US
Assignee:
FERRO CORPORATION - Cleveland OH
International Classification:
C09C 3/06
Abstract:
The potential for release of soluble chromium (VI) ions in the production or processing of certain pigments is reduced by use of certain additives. The additives include aluminum metaphosphate, aluminum fluoride, tungsten oxide, tungstic acid, and mono-ammonium phosphate. The pigments are those which contain chromium and have a corundum crystal structure.