Electrophotographic carrier comprising a coating of a grafted fluoropolymer
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United States of America Patent
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-
Sep 26, 2000
Grant Date -
N/A
app pub date -
May 25, 1999
filing date -
May 26, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A carrier composition is provided for electrophotographic development. Core particles are coated with a graft copolymer of a fluoropolymer and methyl methacrylate. The core particles preferably are a material selected from steel, nickel, iron, ferrites, passivated iron, or mixtures or alloys thereof. The fluoropolymer preferably is a polymer selected from chlorotrifluoroethylene, polyvinylidene fluoride, polytrifluoroethylene, polytetrafluoroethylene, copolymers of vinylidene fluoride and hexafluoropropylene, and copolymers of vinylidene fluoride and tetrafluoroethylene. In a preferred carrier composition, the coating consists of two layers. The exterior layer is a graft copolymer made of a fluoropolymer and methyl methacrylate.
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