BINARY SYSTEM DEVELOPER

PURPOSE: To provide a developer which contains specific carrier and specific toner, which has a sufficient chargeability with no charge control agent, which scatter little toner and which is excellent in image quality. CONSTITUTION: A binary system developer is composed of carrier and toner containi...

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Bibliographic Details
Main Authors FUNATO MASATOMI, KUBO NORIO, KAWADA HIDEAKI, HATASE YOSHITERU, ASANO TERUMICHI, ISHIMARU SEIJIROU
Format Patent
LanguageEnglish
Published 22.03.1996
Edition6
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:PURPOSE: To provide a developer which contains specific carrier and specific toner, which has a sufficient chargeability with no charge control agent, which scatter little toner and which is excellent in image quality. CONSTITUTION: A binary system developer is composed of carrier and toner containing toner particles which in turn contain fixing resin, magnetic powder dispersed in the resin. The fixing resin contains styrene-acrylic group resin having an anionic polar group. This styrene acrylic group resin has a peak molecular weight of 4,000 to 30,000, and a weight-average molecular weight of 70,000 to 200,000, and has an acid value of 4 to 20. The magnetic powder is contained by 0.1 to 5 weight parts with respect to 100 weight parts of the fixing resin. Each of the carrier particles is composed of a core particle and a cover layer. The core particle is made of a magnetic material which is exhibited by MOFe3 (where M is metal such as Cu, Zn). The cover layer is composed of a resin composition containing methyl silicone resin and methylated melamine resin, the weight-average molecular weight of the methylated melamine resin being more than 700.
Bibliography:Application Number: JP19940212221