Process cartridge

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12235606
APP PUB NO 20220100113A1
SERIAL NO

17480797

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A process cartridge includes a photosensitive member, a toner, and a developing roller, a surface layer of the photosensitive member has a Martens hardness of 245 to 300 N/mm2, the developing roller has a single-layered surface layer containing a substrate and a binder resin; when an elastic modulus of the binder resin in a first region is E1, and an elastic modulus of the binder resin in a second region is E2, E1≥200 MPa and 10 MPa≤E2≤150 MPa are satisfied; the elastic modulus in the second region continuously decreases from that in the first region; the toner comprises a toner particle and an external additive A; the external additive A is a silica particle having a major diameter of 40 to 400 nm; and a coverage of the external additive A with respect to surface of the toner particle is 5.0% or more.

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Patent Owner(s)

  • CANON KABUSHIKI KAISHA

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kawaguchi, Shintaro Kanagawa, JP 20 164
Sato, Masamichi Shizuoka, JP 65 606
Tanaka, Masatake Kanagawa, JP 55 977
Uesugi, Tomoya Shizuoka, JP 15 213

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