Toner, developer, and image formation device

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United States of America Patent

PATENT NO 9921503
SERIAL NO

15122087

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Abstract

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A toner including: a pigment; polyester resin A that is insoluble in tetrahydrofuran (THF); and polyester resin B that is soluble in THF, wherein the toner satisfies requirements (1) to (3) below:

    (1) the polyester resin A includes one or more aliphatic diols including from 3 through 10 carbon atoms, as a component constituting the polyester resin A;(2) the polyester resin B includes at least an alkylene glycol in an amount of 40 mol % or more, as a component constituting the polyester resin B; and(3) a glass transition temperature (Tg1st) of the toner at first heating in differential scanning calorimetry (DSC) of the toner is from 20° C. through 50° C.

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Patent Owner(s)

  • RICOH COMPANY, LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Amemori, Suzuka Shizuoka, JP 29 343
Chiba, Susumu Shizuoka, JP 21 205
Mizoguchi, Yuka Shizuoka, JP 28 80
Nagai, Shinsuke Shizuoka, JP 11 43
Nagata, Kohsuke Shizuoka, JP 17 93
Nakayama, Shinya Shizuoka, JP 108 1768
Sugimoto, Tsuyoshi Shizuoka, JP 86 1249
Yamada, Hiroshi Shizuoka, JP 691 7936

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