Single component toner for improved magnetic image character recognition

Single component toner for improved magnetic image character recognition

Magnetic toner particles are disclosed. The magnetic toner particles contain at least one polymeric binder and at least one magnetic additive, wherein the surface of the toner particle contains particles of positively chargeable inorganic fine powder particles. The inorganic fine powder particles ha...

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Hauptverfasser: CONTOIS, ROBERT E, PUTNAM, DAVID D, MARSH, DANA G, CRICHTON, JOHN F
Format: Patent
Sprache:eng ; fre ; ger
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CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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creator CONTOIS, ROBERT E
PUTNAM, DAVID D
MARSH, DANA G
CRICHTON, JOHN F
description Magnetic toner particles are disclosed. The magnetic toner particles contain at least one polymeric binder and at least one magnetic additive, wherein the surface of the toner particle contains particles of positively chargeable inorganic fine powder particles. The inorganic fine powder particles have a mean volume average particle size of from about 0.5 to about 7 mu m, and a cleaning ratio of from about 0.1 to about 5.0 and a cleaning ratio being the volume fraction of particles between 0 and 1.0 mu m, divided by the volume fraction of particles greater than 1.0 mu m; and the toner particles having on the surface thereof a flowability improving agent having a BET surface area of at least about 30 m /g. Methods of forming electrostatic images are further disclosed. Also, images formed from the magnetic toner particles are further disclosed and have excellent character void frequency, total void area, and suitable magnetic signal strengths. Developers containing the magnetic toner particles of the present invention are also disclosed.
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The magnetic toner particles contain at least one polymeric binder and at least one magnetic additive, wherein the surface of the toner particle contains particles of positively chargeable inorganic fine powder particles. The inorganic fine powder particles have a mean volume average particle size of from about 0.5 to about 7 mu m, and a cleaning ratio of from about 0.1 to about 5.0 and a cleaning ratio being the volume fraction of particles between 0 and 1.0 mu m, divided by the volume fraction of particles greater than 1.0 mu m; and the toner particles having on the surface thereof a flowability improving agent having a BET surface area of at least about 30 m /g. Methods of forming electrostatic images are further disclosed. Also, images formed from the magnetic toner particles are further disclosed and have excellent character void frequency, total void area, and suitable magnetic signal strengths. 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subjects CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
title Single component toner for improved magnetic image character recognition
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