US Patent No. 9,250,546

MEMBER FOR ELECTROPHOTOGRAPHY, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS


Patent No. 9,250,546
Issue Date February 02, 2016
Title Member For Electrophotography, Process Cartridge, And Electrophotographic Apparatus
Inventorship Naoto Kameyama, Kawasaki (JP)
Kenji Onuma, Machida (JP)
Rieko Sakamoto, Kawasaki (JP)
Yasushi Shimizu, Yokohama (JP)
Koichi Sato, Kawasaki (JP)
Kimihiro Yoshimura, Yokohama (JP)
Akira Watanabe, Yokohama (JP)
Maho Tanaka, Tokyo (JP)
Shigeki Takishita, Moriya (JP)
Hiroshi Tominaga, Kashiwa (JP)
Keiji Karube, Toride (JP)
Takenori Sueoka, Tsukuba (JP)
Assignee Canon Kabushiki Kaisha, Tokyo (JP)

Claim of US Patent No. 9,250,546

1. A member for electrophotography having a multilayer structure or a single-layer structure, comprising an outermost layer
which satisfies the following A, B and C:
A: the outermost layer has perfluoropolyether and a binder resin, and
in the outermost layer, the ratio of the number of fluorine atoms to the number of carbon atoms ((number of fluorine atoms)/(number
of carbon atoms)) is 0.10 or more and 0.40 or less;

B: in a 19F-NMR spectrum of the outermost layer, the relaxation time T2 of a peak derived from CF2 moieties of perfluoropolyether is 13 milliseconds or more at 22° C.; and

C: the total sum of the contents of CF3 moieties, CF2 moieties, and CF moieties in the binder resin is 5% by mass or less.