RESIN COATED CARRIER, TWO-COMPONENT DEVELOPER, DEVELOPMENT DEVICE, AND IMAGE FORMING APPARATUS

PROBLEM TO BE SOLVED: To provide a resin coated carrier for stably charging toner with an external additive having a large particle size added thereto for a long time and preventing blocking of a developer; a two-component developer; a developing device; and an image forming apparatus. SOLUTION: The...

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Main Authors IWAMATSU TADASHI, HAYASHI MASATOMO, KAMOTO TAKANORI, SEKI NOBUHIRO, MATSUURA NATSUKI, WADA OSAMU, YOSHIOKA NOBUYUKI
Format Patent
LanguageEnglish
Published 05.08.2010
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To provide a resin coated carrier for stably charging toner with an external additive having a large particle size added thereto for a long time and preventing blocking of a developer; a two-component developer; a developing device; and an image forming apparatus. SOLUTION: The resin coated carrier is produced so as to satisfy the following formulas (1) and (2). Formula (1): log(Mb/Ma)>2. Formula (2): 0.5≤-log(A/B)≤2.5. In formula (1), Ma represents a weight average molecular weight of a silicone resin having a minimum weight average molecular weight, and Mb represents a weight average molecular weight of a silicone resin having a maximum weight average molecular weight, both silicon resins being included in a resin coating layer 2b. In formula (2), A represents a volume resistivity value (Ω/cm) in an electric field of 1,000 V/cm that is obtained by conducting a stirring test, and B represents a volume resistivity value (Ω/cm) in an electric field of 1,000 V/cm before the stirring test. COPYRIGHT: (C)2010,JPO&INPIT
Bibliography:Application Number: JP20090011421