Ricoh Company, Ltd.

Yoshitsugu Kimura

Daisuke Inoue

Ryota Inoue

Masana Shiba

Rintaro Takahashi

Tomoki Murayama

Junichi Awamura

Naohiro Watanabe

Shingo Sakashita

Akio Takei

A toner including a binder resin, wherein a toner extract obtained by drying an extraction liquid obtained through Soxhlet extraction of the toner with tetrahydrofuran (THF) has glass transition temperature Tg in a range of from 35&#xb0; C. through 55&#xb0; C., and a moisture-content change rate of the toner extract before and after leaving the toner extract to stand for 3 days in an environment of 40&#xb0; C. and 70% RH is 0.5% or less, and wherein a specific-surface-area change rate of the toner before and after leaving the toner to stand for 3 days in an environment of 40&#xb0; C. and 70% RH is in a range of from 15% through 50%.

Toner, toner stored unit, and image forming apparatus

A toner comprising a binder resin and a release agent, wherein the toner has a difference of 30 or less between a maximum value and a minimum value among peak intensities in a range of Molecular weight M&#xb1;300 where Molecular weight M is a molecular weight selected from a range of from 300 through 5,000 in a molecular weight distribution of tetrahydrofuran (THF)-soluble components in the toner as measured by gel permeation chromatography (GPC), and wherein the peak intensities are defined as relative values assuming a maximum peak value in molecular weights of 20,000 or less is 100, in a molecular weight distribution curve taking an intensity as a vertical axis and a molecular weight as a horizontal axis as measured by GPC.

A toner including a binder resin and a release agent, wherein the toner has a component soluble in a 50% by mass aqueous methanol solution in an amount of 0.10% by mass to 0.60% by mass, and wherein the toner has a flowing-out beginning temperature (Tfb) of 55.0&#xb0; C. to 100.0&#xb0; C. as determined by a flowtester method.

Toner, image forming apparatus, and process cartridge

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Kanagawa, Japan

Yoshitsugu Kimura