Ricoh Company, Ltd.

Ricoh Technology, Ltd.

Yasuo Kamada

Hiroshi Yamada

Akio Takei

Toma Takebayashi

Yoko Arai

Chiaki Tanaka

Akinori Saitoh

Taichi Nemoto

Satoshi Izumi

Koichiro Oyama

Atsumi Yamabe

Junichi Awamura

Takahiro Honda

Daichi Hisakuni

Hiroyuki Takeda

Ryuuta Yoshida

Akira Tanaka

Masahiro Yukikawa

Yuuichi Satoh

The present disclosure provides a toner having excellent low-temperature fixing, heat-resistant-storage property, cleaning performance, and filming resistance. A toner containing toner base particles having a crystalline polyester resin and an amorphous polyester resin includes a plurality of organic particles disposed at least partially embedded in a surface of the toner base particles. A percentage of the crystalline polyester resin occupying the surface of the toner base particles is 4% to 20%, a volume average particle size of the organic particles is 10 nm to 40 nm, and a standard deviation of a distance between adjacent particles of the organic particles that are not in contact is 500 nm or less.

Toner, developing agent, toner stored unit, and image forming apparatus

A toner includes toner particles, each including: a toner base particle including a binder resin, a colorant, and wax; and resin particles on a surface of the toner base particle, wherein Formulae 1 to 3 below are satisfied, where M is a volume average primary particle diameter (nm) of the resin particles, and L is a distance (nm) between the resin particles present next to one another on the surface of the toner base particle:  (Formula 1)5 (nm)<≤60 (nm); and  (Formula 2)0.40≤[(nm)/(nm)]<0.90.  (Formula 3)

Toner and production method thereof, and toner stored unit, image forming apparatus, and image forming method

A toner includes toner base particles each including: a binder resin, a colorant, and wax; and resin particles on surfaces of the toner base particles. A standard deviation of a distance between the resin particles next to each other on the surfaces of the toner base particles is less than 500 nm.

Toner and production method thereof, toner stored unit, image forming apparatus, and image forming method

Provided is a toner including toner base particles and resin particles. Each toner base particle includes a binder resin, a colorant, and wax. Each resin particle e has a core-shell structure including a core and a shell, where a glass transition temperature TgA of the shell is higher than a glass transition temperature TgB of the core. A surface of each toner base particle is covered with the resin particles. A storage elastic modulus G'1 of the toner at 70° C. during heating is 1.0×10Pa or greater but 1.0×10Pa or less, and a storage elastic modulus G′2 of the toner at 100° C. during heating is 1.0×10Pa or greater but 5.0×10Pa or less, as the toner is measured by a rheometer.

Toner, developer, toner storage unit, image forming apparatus, and image forming method

An image forming apparatus includes an image bearer, a developing unit configured to develop a latent image formed on the image bearer with a toner to form a toner image, and a transfer member including a contact area that comes in contact with the image bearer. The toner image is primary transferred from the image bearer to the transfer member. A speed difference between the image bearer and the transfer member at the contact area is 0.1% or greater but 0.8% or less. The toner has an average circularity of 0.971 or greater but 0.986 or less and a shape factor SF-2 of 110 or greater but 119 or less. The speed difference is represented by the following formula:Speed difference [%]={(1&#x2212;2)/2}&#xd7;100&#x2003;&#x2003;[Speed difference]where V1 is a linear speed of the image bearer, and V2 is a linear speed of the transfer member.

Image forming apparatus and image forming method

A particulate polyamide is provided. The particulate polyamide is porous and includes at least one of polyamide 4 and polyamide 3. In addition, the particulate polyamide has a particle diameter (d50) of from 10 &#x3bc;m to 1,000 &#x3bc;m and a particle diameter dispersion degree (Dv/Dn) of not greater than 3.0, wherein Dv represents the volume average particle diameter of the particulate polyamide, and Dn represents the number average particle diameter of the particulate polyamide.

Particulate polyamide, and method for preparing the particulate polyamide

A toner is provided. The toner contains a polyester resin. The toner has a glass transition temperature (Tg1st) at first temperature rising of differential scanning calorimetry (DSC) of from 45&#xb0; C. to 65&#xb0; C. The toner includes a component insoluble in tetrahydrofuran (THF) having two glass transition temperatures (Tga1st and Tgb1st) at the first temperature rising of DSC, where Tga1st is in a range of &#x2212;45&#xb0; C. to 5&#xb0; C. and Tgb1st is in a range of 45&#xb0; C. to 70&#xb0; C. The toner includes a component soluble in THF having a glass transition temperature (Tg2nd) at second temperature rising of DSC of from 40&#xb0; C. to 65&#xb0; C.

Toner, developer, and image forming device

To provide a method for producing a polymer, which contains: bringing a ring-opening polymerizable monomer containing an amide bond, and a compressive fluid into contact with each other to melt or dissolve the ring-opening polymerizable monomer containing an amide bond, followed by allowing the ring-opening polymerizable monomer containing an amide bond to react through ring-opening polymerization in the presence of a basic organic metal catalyst and a cocatalyst, to thereby obtain a polymer product.

Method for producing polymer

A polymer production apparatus, including: supplying unit containing first supplying unit to supply raw materials containing monomer, and second supplying unit to supply compressive fluid; contacting unit to bring the monomer and the compressive fluid into contact together; and outlet configured to discharge reaction product of the monomer, wherein reaction unit is provided between the contacting unit and the outlet, where the reaction unit is to pass the monomer from the contacting unit side to the outlet side, while allowing the monomer to carry out a polymerization reaction in the presence of the compressive fluid, and wherein the reaction unit contains circulation unit containing first pipe and second pipe, where a fluid is passed through the first pipe from the contacting unit side to the outlet side, and the second pipe is to return the fluid from return port provided upstream extrusion unit to inlet provided upstream the return port.

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Shizuoka, Japan

Yasuo Kamada