ELECTROPHOTOGRAPHIC MEMBER, METHOD FOR PRODUCING SAME, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC IMAGE-FORMING DEVICE

WIPO Patent Application WO/2022/230638

A1

Provided is an electrophotographic member that, even with a low-hardness urethane elastomer, exhibits a rapid deformation recovery and can suppress streak-shaped image defects. The electrophotographic member comprises a shaft core and an elastic layer disposed on the outer circumference of the shaft core. The elastic layer contains a urethane elastomer that has a matrix and a plurality of domains dispersed in the matrix. The elastic modulus of the domains, measured in the cross section of the thickness direction of the elastic layer, is lower than the elastic modulus of the matrix, and the micro-rubber hardness of the elastic layer at a temperature of 23°C is 20 to 50. In an indentation test on the elastic layer using a nanoindenter at 23°C, wherein the test comprises indentation with a Vickers indenter at a loading rate of 10 mN/30 sec, holding for 60 seconds at a load of 10 mN, and then unloading, the strain after unloading for 5 seconds is not more than 1 µm.

WATANABE MASAHIRO (JP)
SATO KANA (JP)
HINO TETSUO (JP)
OGAWA RYO (JP)
HIRATANI TAKAYUKI (JP)

PCT/JP2022/017332

November 03, 2022

April 08, 2022

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CANON KK (JP)

F16C13/00; C08G18/40; G03G15/00; G03G15/02; G03G15/08; G03G15/10

JP2004133287A	2004-04-30
JP2012103581A	2012-05-31
JP2020166259A	2020-10-08
JPH0934216A	1997-02-07
JP2021074334A	2021-05-20
JP2021161240A	2021-10-11
JP2022011865A	2022-01-17
JP2022044046A	2022-03-16

IEEE TRANSACTIONS ON SYSTEMS, MAN, AND CYBERNETICS, vol. 9, no. 1, January 1979 (1979-01-01), pages 62 - 66

OKABE Yuzuru et al. (JP)

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