Wilfried Burow - Krefeld, DE Wolfgang Oehlert - Wheeling WV
Assignee:
Bayer AG
International Classification:
C01G 4902
US Classification:
106456
Abstract:
Pure-coloured iron oxide yellow pigments having a silking index of less than 5 and a heat resistance of greater than 220. degree. C. in polyethylene for at least 5 minutes are obtained by oxidation of metallic iron with nitrobenzene in an acid medium in the presence of compounds of elements chosen from main groups 3 and 4 of the periodic table.