Toner

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United States of America Patent

PATENT NO 8614043
APP PUB NO 20130130171A1
SERIAL NO

13666332

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Abstract

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A toner including a core particle, an inner shell layer covering the core, and an outer shell layer covering the inner shell layer is provided. The core particle includes a resin P. The inner shell layer includes fine particles of a resin A. The outer shell layer includes fine particles of a resin B. The toner satisfies the following formulae (1) to (3):

description='In-line Formulae' end='lead'4.5≦T½(P)−Tfb(P)≦14  (1)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'20≦T½(A)−Tfb(A)≦40  (2)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'23.5≦T½(B)−Tfb(B)≦40  (3)description='In-line Formulae' end='tail'

wherein T½(P), T½(A), and T½(B) represent ½ method temperatures of the resins P, A, and B, respectively, and Tfb(P), Tfb(A), and Tfb(B) represent flow beginning temperatures of the resins P, A, and B, respectively, and wherein the ½ method temperatures and the flow beginning temperatures are measured by a flowtester.

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Patent Owner(s)

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

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Awamura, Junichi Shizuoka, JP 69 1392
Honda, Takahiro Shizuoka, JP 77 1009
Nagatomo, Tsuneyasu Shizuoka, JP 51 757
Ogawa, Satoshi Nara, JP 195 1906
Uchinokura, Osamu Shizuoka, JP 70 1570
Watanabe, Masaki Shizuoka, JP 291 4509
Yamashita, Hiroshi Shizuoka, JP 467 5965

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