Particles suitable as carriers for electrophotography
AssigneeBASF SE
InventorsJoerg Adel, Norbert Mronga, Erwin Czech
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Abstract
Particles (I) which are suitable as carriers for electrophotography consist of a) a magnetic core and b) a shell of alumina, chromium oxide, molybdenum oxide, tungsten oxide, silica, tin oxide or zirconium oxide or a mixture thereof and particles (II) consist of a) a magnetic core and b) a shell of titanium oxide and are obtainable by decomposing a titanium tetraalcoholate in the gas phase by reaction with steam and/or oxygen in the presence of agitated cores, and these particles are used in electrophotographic two-component developers.
Claims10
Carrier particles for electrophotography consisting of
- a) a magnetic core and
- b) a shell consisting of molybdenum oxide, tungsten oxide or a mixture thereof.
An electrophotographic two-component developer, comprising carrier particles consisting of
- a) a magnetic core and
- b) a shell consisting of molybdenum oxide, tungsten oxide or tin oxide or a mixture thereof,
- and toner particles.
A process for the preparation of carrier particles for electrophotography consisting of
- a) a magnetic core and
- b) a shell consisting of molybdenum oxide, tungsten oxide or a mixture thereof, consisting of decomposing a volatile metal compound selected from the group consisting of compounds of molybdenum, compounds of tungsten and a mixture thereof by reaction with steam or oxygen or both in the gas phase in the presence of heated, agitated magnetic core particles to thereby obtain said carrier particles.
Dependencies are inferred from the claim text.