JPH027062B

PURPOSE:To prevent the decrease in image density in a developer and sticking thereof on a background part by using a small grain-size carrier mixed with a binder resin and needlelike magnetic powder. CONSTITUTION:The compounding ratio by weight of the binder resin and magnetic powder in a carrier is...

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Bibliographic Details
Main Authors YOSHIKAWA HIROAKI, AMAGAI YOSHIMI
Format Patent
LanguageEnglish
Published 15.02.1990
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:PURPOSE:To prevent the decrease in image density in a developer and sticking thereof on a background part by using a small grain-size carrier mixed with a binder resin and needlelike magnetic powder. CONSTITUTION:The compounding ratio by weight of the binder resin and magnetic powder in a carrier is made (20:80)-(40:60). Polystyrene, polyacrylate, polyamide, etc. and a copolymer of monomers constituting said polymers are usable as the binder resin. The amt. of the magnetic carrier to be compounded in the carrier is 40-80wt% and at least 10% needlelike magnetic powder is used for the magnetic powder. The needlelike magnetic powder having 0.1-3mu average grain size and >=2 ratio between the long axis/short axis is used and pulverous powders of needlelike magnetite, needlelike ferrite, gamma-Fe2O3, etc. are usable. The average grain size of the carrier is 10-40mum.
Bibliography:Application Number: JP19830098808