Canon Kabushiki Kaisha

Katsuhisa Matsunaka

Kazuo Kishino

Masahiro Suzuki

Takeshi Suzuki

Masaaki Takahashi

Yasuhiro Miyahara

Katsuya Abe

Naoki Akiyama

Hiroyuki Sakakibara

Jun Miura

Yutaka Arai

Hiroaki Sakai

Atsushi Iwasaki

Toshinori Nakayama

Shuichi Tamura

Shigeaki Takada

Daigo Matsuura

Akeshi Asaka

Yuji Kitano

Hiroshi Mano

Akira Kato

Satoshi Nishida

Koji Sato

Minoru Hayasaki

Aoji Isono

Hideyuki Yano

Isamu Takeda

Michio Uchida

Hiroto Sugimoto

Norio Hashimoto

Yuko Sekihara

Matsutaka Maeda

Mamo Matsumoto

Yasuharu Notoya

Shinsuke Takahashi

Yoko Kuruma

Jiro Ishizuka

Atsuyoshi Abe

Yuki Nishizawa

Masayuki Tamaki

Kenji Hashimoto

Masahito Omata

Sho Taguchi

Hiroki Muramatsu

Takuji Oishi

Naofumi Murata

Kimitaka Ichinose

Hidekazu Maruta

Koichi Kakubari

Shoji Umehara

Yoshihito Oshima

Yusuke Baba

Yoji Tomoyuki

Makoto Souma

Keigo Kaji

Ryo Yashiro

Osamu Soutome

Nobuyuki Kume

Yo Imaizumi

Yosuke Kitagawa

Noritaka Inoue

Ko Nakano

Ken-ichi Ogawa

Tomohira Kasumi

An electrophotographic member including: a base member; an elastic layer having a thickness of from 100 &#x3bc;m to 500 &#x3bc;m, and containing a cured product of an addition-curable silicone rubber composition; and a cured product layer arranged between the base member and the elastic layer, the cured product layer containing a cured product of a composition containing an organopolysiloxane having a Si&#x2014;H group and a silane coupling agent having an alkenyl group. A peel adhesive strength between the elastic layer and the base member is a specific range. The elastic layer undergoes a cohesive failure in a peel test from the base member. The ratio (HU2/HU1) of a universal hardness HU2 on the inner surface of the elastic layer to a universal hardness HU1 at a position reached by cutting the elastic layer from its outer surface in its depth direction by 10 &#x3bc;m is a specific range.

Electrophotographic member and fixing device

A pressure roller, and the pressure roller to be used in a fixing apparatus of in an image forming apparatus, the fixing apparatus configured to heat a toner image formed on a recording material and fix the toner image on the recording material, the pressure roller including a first elastic layer, and a second elastic layer provided on an outside of the first elastic layer, wherein a thermal conductivity of the first elastic layer is higher than a thermal conductivity of the second elastic layer, and wherein the first elastic layer contains a plurality of void portions, hole pathway portions joining the plurality of void portions to each other, and a needle-shaped high thermal conductive filler.

Pressure roller for fixing apparatus, fixing apparatus and image forming apparatus

Provided is a fixing member includes: a substrate; and an elastic layer on the substrate, wherein the elastic layer contains a rubber and fillers dispersed in the rubber, and wherein an average value of area ratios of large-particle diameter fillers is 20% or more and 40% or less, and the large-particle diameter fillers have an average array degree fof 0.00 or more and 0.15 or less, an average value of an area ratios of small-particle diameter fillers is 10% or more and 20% or less, the small-particle diameter fillers have an average array degree fof 0.20 or more and 0.50 or less, and the small-particle diameter fillers have an average array angle &#x3a6;of 60&#xb0; or more and 120&#xb0; or less.

Endless shaped fixing belt and heat fixing device having endless belt shape heating member

Provided is a fixing member for a heat fixing apparatus which can further improve utilization efficiency of heat for heat fixing of an unfixed toner. A fixing member having an endless belt shape includes a substrate and an elastic layer on the substrate, wherein the elastic layer includes silicone rubber and a filler dispersed in the silicone rubber, and when a thermal conductivity of the elastic layer in a thickness direction is defined as &#x3bb;nd, a thermal conductivity of the elastic layer in a circumferential direction is defined as &#x3bb;td, and a thermal conductivity of the elastic layer in a width direction is defined as &#x3bb;md, &#x3bb;nd is 1.30 W/(m&#xb7;K) or more, and &#x3bb;nd, &#x3bb;td, and &#x3bb;md satisfy a relationship as shown below &#x3bb;nd&#x3e;&#x3bb;md&#x3e;&#x3bb;td.

Fixing member and heat fixing apparatus

The present disclosure provides a fixing member that has a substrate, and a single layer of an elastic layer on the substrate, the elastic layer having a thickness of 100 &#x3bc;m or more, and containing a binder and a filler, wherein the elastic layer contains the filler in a content of 30% by volume or more to 60% by volume or less based on the total volume of the elastic layer, and wherein, when a surface of the elastic layer facing to the substrate is defined as a first surface, and a surface of the elastic layer opposed to the first surface is defined as a second surface, an average value of ratios of an element derived from the filler is 0.0 atomic % or more to 6.0 atomic % or less in a region having a thickness of 6 &#x3bc;m, from the first surface toward the second surface.

Fixed member and heat fixing apparatus

A liquid silicone rubber mixture, includes an organopolysiloxane having two or more unsaturated aliphatic groups in a molecule thereof; an organohydrogenpolysiloxane having two or more hydrogen atoms bonded to a silicon atom in a molecule thereof; a hydrosilylation catalyst; hollow particles each having a layer containing a thermoplastic resin as a shell; a compound having a hydroxyl group and/or an ether bond in its molecule so that a sum of a number of the hydroxyl group and a number of the ether bond is two or more; and a polycarboxylic acid. A pressurizing member of a fixing device for use in an electrophotographic image forming apparatus includes an elastic layer containing a silicone rubber on a substrate.

Liquid silicone rubber mixture, and pressurizing member of a fixing device for an electrophotographic image forming apparatus

The present disclosure provides an electrophotographic member having an elastic layer containing graphite particles dispersed in a silicone rubber and having a high thermal conductivity in the thickness direction. The electrophotographic member includes a substrate and an elastic layer on the substrate, the elastic layer containing a cured product of an addition-curable liquid silicone rubber mixture including an addition-curable liquid silicone rubber and graphite particles, and the graphite particles having a DBP oil absorption number of 40 cm/100 g or more and lower than 80 cm/100 g.

Addition-curable liquid silicone rubber mixture, electrophotographic member and production method therefor, and fixing apparatus

Provided is an electrophotographic member, the member including an elastic layer that is formed by graphite particles dispersed in a silicone rubber and has high thermal conductivity in the thickness direction. The electrophotographic member has a substrate and an elastic layer on the substrate, in which the elastic layer contains a cured product of an addition-curable liquid silicone rubber mixture including graphite particles, the dibutyl phthalate (DBP) oil absorption number of the graphite particles is from 80 cm/100 g to 150 cm/100 g, the thermal conductivity in the thickness direction of the elastic layer is from 1.1 W/(m&#xb7;K) to 5.0 W/(m&#xb7;K), and the modulus in tension of the elastic layer is from 0.1 MPa to 4.0 MPa.

Addition-curable liquid silicone rubber mixture, electrophotographic member, method for producing the same, and fixing apparatus

The present invention is directed to providing a fixing member that can form high quality electrophotographic images. The fixing member includes a substrate, an elastic layer on the substrate and a surface layer bonded to the elastic layer with an adhesive layer. The surface layer contains a fluorine resin. The surface layer having a thermal resistance in the thickness direction of 3.0&#xd7;10m&#xb7;K/W or more and 1.3&#xd7;10m&#xb7;K/W or less and the peel adhesion strength between the surface layer and the elastic layer is 3.0 N/cm or more and 20.0 N/cm or less, while the elastic layer undergoes a cohesive failure in a peel test between the surface layer and the elastic layer and the fluorine resin contains a tetrafluoroethylene/perfluoroethyl vinyl ether copolymer, the polymerization ratio of perfluoroethyl vinyl ether in the copolymer being 3.0 mol % or more and 5.8 mol % or less.

Fixing member, fixing apparatus and electrophotographic image forming apparatus

A fixing member is provided, including a release layer containing a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), wherein a content of the perfluoroalkyl vinyl ether (PAVE) based on all PFAs in the release layer is 3.0 mol % or more and 5.8 mol % or less, and an elastic layer having an indentation elastic modulus Eat a surface thereof and an indentation elastic modulus Eat a position in a depth of 50 &#x3bc;m from the surface, Eand Ebeing measured at a temperature of 150&#xb0; C., and Eis larger than Eand Ebeing 17 MPa or more and 24 MPa or less.

Fixing member, fixing device, and image forming apparatus

An image heating apparatus configured to heat an image formed on a recording material includes a cylindrical rotatable member including a conductive layer, a magnetic core inserted through the rotatable member, a coil helically wound around an outer side of the magnetic core within the rotatable member, and an inverter configured to supply an alternating current to the coil. A frequency of the alternating current supplied from the inverter is within a range of 20.5 to 100 kHz. The conductive layer generates heat by electromagnetic induction due to an alternating magnetic field produced from the alternating current supplied to the coil. The coil is wound at an interval of 1 mm or longer.

Image heating apparatus

An elastic layer includes a needle-shaped filler and a void and has a porosity of 20 vol % or more and 60 vol % or less. The elastic layer contains a first area and a second area. The first area extends from a surface of the elastic layer opposite to a surface facing the mandrel toward the mandrel and has a thickness of 30% of the thickness of the elastic layer. The second area is a central area in a thickness direction of the elastic layer and has a thickness of 40% of the thickness of the elastic layer. The needle-shaped filler in the second area has an orientation degree of 50% or lower. The needle-shaped filler in the first area has an orientation degree higher than that of the needle-shaped filler in the second area.

Elastic roller with needle-shaped filler and fixing device

The present invention relates to a fixing member including a surface layer containing PFA, the fixing member being excellent in wear resistance and having high release properties to a toner. The fixing member includes a base member, an elastic layer provided on the surface of the base member, and a surface layer, wherein the surface layer contains a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer having a particular partial structure, and has a surface having a contact angle of 67 degrees or more as measured in a mixed liquid for a wetting tension test having a wetting tension of 31.0 mN/m.

Fixing member, method for manufacturing the same, fixing apparatus, and image forming apparatus

A fixing member includes a substrate and an elastic layer on the substrate. The elastic layer comprises a cured product of a silicone rubber composition containing an anatase titanium oxide particle and an addition-curable silicone rubber, and undergoes cohesive failure in 90&#xb0; peel test specified in JIS K6854-1: 1999. In the fixing member, an allyl group bound to a silicon atom is present at the interface between the substrate and the elastic layer.

Electrophotographic image forming fixing member, method for manufacturing said fixing member, and electrophotographic image forming apparatus

Growing community of inventors

Inagi, Japan

Katsuhisa Matsunaka