TONER AND DEVELOPER

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United States of America Patent

APP PUB NO 20130149642A1
SERIAL NO

13682022

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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To provide a toner, which contains a first binder resin, and a second binder resin, wherein the first binder resin is a block polymer containing at least a polyester skeleton A having, in a repeating structure thereof, a constitutional unit formed by dehydration condensation of hydroxycarboxylic acid, and a skeleton B that does not have, in a repeating structure thereof, a constitutional unit formed by dehydration condensation of hydroxycarboxylic acid, and the first binder resin has glass transition temperature Tg1 and Tg 2 as measured by differential scanning calorimetry at a heating rate of 5° C./min, wherein the Tg1 is −20° C. to 20° C., and the Tg2 is 35° C. to 65° C., and wherein the second binder resin is a crystalline resin.

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Patent Owner(s)

Patent OwnerAddress
RICOH COMPANY LTD3-6 NAKAMAGOME 1 CHOME OHTA-KU TOKYO 143-8555

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
AMEMORI, Suzuka Shizuoka, JP 29 350
MAKABE, Keiji Shizuoka, JP 27 265
MORIYA, Yoshihiro Shizuoka, JP 44 539
NAKAJIMA, Yukiko Kanagawa, JP 36 516
NEMOTO, Taichi Shizuoka, JP 62 367
SABU, Akiyoshi Shizuoka, JP 44 752
YAMADA, Masahide Shizuoka, JP 82 1327
YAMASHITA, Daiki Kanagawa, JP 35 428
YAMAUCHI, Yoshitaka Shizuoka, JP 63 510

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