Carrier core material and electrophotographic development carrier using same and electrophotographic developer

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11556070
APP PUB NO 20210132520A1
SERIAL NO

16492488

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Abstract

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According to the present invention, there is provided a carrier core material that is formed of ferrite particles in which 48 to 52 mass % of Fe, 16 to 22 mass % of Mn, 1.0 to 3.5 mass % of Mg and 0.05 to 0.5 mass % of Ca are included, and when an electrical resistance value with an applied voltage of 500 V in an environment (in an L/L environment) in which the temperature is 10° C. and the relative humidity is 35% is RL (Ω·cm), and an electrical resistance value with an applied voltage of 500 V in an environment (in an H/H environment) in which the temperature is 30° C. and the relative humidity is 70% is RH (Ω·cm), formula (1) below is satisfied.

description='In-line Formulae' end='lead'0.1≤(log RL−log RH)≤0.3  (1)description='In-line Formulae' end='tail'

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Patent Owner(s)

Patent OwnerAddress
DOWA ELECTRONICS MATERIALS CO LTD4-14-1 SOTOKANDA CHIYODA-KU TOKYO 101-0021
DOWA IP CREATION CO LTD7 CHIKKOU-SAKAEMACHI OKAYAMA-SHI OKAYAMA 702-8053

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ishikawa, Yohei Okayama, JP 68 849
Kawauchi, Takeshi Okayama, JP 19 32
Miyano, Hiroyuki Okayama, JP 9 29

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