Patent ID: 6063180
Filing Date: 2000-05-16
Classification: C01P,C09C,G03G

Abstract:
Magnetic iron oxide-containing granules comprising 95.0 to 99.8 wt. % of a magnetic iron oxide-containing compound and 0.2 to 5.0 wt. % of a binder, wherein the magnetic iron oxide-containing compound has an iron content of 50 to 73 wt. %, wherein the granules have the following properties: a lightness under brightening L* of 40 to 79 CIELAB units, a color cast a* of -1 .0 to 4.0 CIELAB units, a color cast b* of 0.0 to -7.0 CIELAB units, an average particle size of 30 to 250 .mu.m, and a residue of less than 2 wt. % in a flow properties test having a 1 mm sieve and 400 strokes and wherein the binder comprises a compound selected from the group consisting of polysiloxanes, polyesters, polyalcohols, long-chain fatty acids having more than 10 carbons, fatty acid esters having more than 10 carbon atoms, organometallic compounds and polyvinyl alcohols.