Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
Image formation method
A toner includes a polyol-based resin having multiple hydroxyl groups in a molecular chain thereof in which a ratio of epoxy group to hydroxyl group is from 0.990 to 1.010. A stirring and transfer device satisfies 1000000≦α×β×γ≦16000000, wherein α represents a number of rotation per minute, β (mm) represents a pitch and γ (mm) represents a transfer path length of the stirring and transfer device. A temperature Tin (° C.) in a development device during stirring and transfer of a two component developing agent satisfies 3020 C.<Tin<60° C., and the toner satisfies Y≦−0.5X+45, 5≦X<40, 5≦Y≦35, wherein X (%) represents a degree of agglomeration of a mother toner particle and Y (%) represents a degree of agglomeration of the toner which has been preserved at 55° C. for 24 hours.
Ricoh Company Limited
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Fumihiro Hiroshi Hisashi Yasuo Hiroyuki Takahiro
Sasaki Yamada Nakajima Asahina Fushimi Honda