Magnetic carrier and two-components developer
AssigneeCanon Kabushiki Kaisha
InventorsYoshinobu Baba, Koh Ishigami, Naoki Okamoto, Tomoko Endo
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Abstract
The present invention provides an image of high image quality by using a magnetic carrier coated with a novel coating resin composition. Further, the present invention stably provides a good image which is hardly influenced by environmental fluctuation and long-term use and has a superior stability of a charging amount when left to stand especially under high temperature and high humidity environments. The present invention also provides a magnetic carrier characterized in that a carrier core surface is coated with a copolymer containing at least, as copolymerization components, an acrylic monomer having a specific structure and an acrylic macromonomer having a specific structure.
Claims8
A magnetic carrier wherein a carrier core surface is coated with a copolymer whose copolymerization components are a monomer having a structure represented by the following formula (A1) and a macromonomer having a structure represented by the following formula (A2):
- wherein R1 represents a hydrocarbon group having 4 or more carbon atoms and R2 represents H or CH3;
- wherein A represents a polymer whose polymerization component is one or two or more compounds selected from the group consisting of methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, styrene and acrylonitrile, and R3 represents H or CH3.
Dependencies are inferred from the claim text.