Toray Industries, Inc.

Sumitomo Chemical Company, Limited

Dai Nippon Printing Co., Ltd.

Kuraray Co., Ltd.

Toppan Printing Co., Ltd.

Jsr Corporation

Konica-minolta Holdings, Inc.

Dainippon Ink and Chemicals, Incorporated

Sumitomo Bakelite Company Limited

Nec Corporation

Hitachi Chemical Company, Ltd.

Akimitsu Tsukuda

Masanori Sueoka

Atsushi Sawamoto

Nobuyasu Kai

Toshihiro Tsuzuki

Nobuaki Ito

Hideki Moriyama

Kazumasa Yoneyama

Kei Ikoma

Ken Sumiyoshi

Kazushige Takechi

Noboru Oshima

Ichiro Fujieda

Yoshiyuki Ono

Atsushi Kumano

Motoyuki Suzuki

Katsuya Fujisawa

Hisatomo Yonehara

Toshimasa Eguchi

Yoshiki Matsuoka

Kazuo Genda

Tokuo Ikari

Norimasa Sekine

Toshiya Ieki

Shigenori Yamaoka

Tatsumi Takahashi

Yasuo Tsuruoka

Mitsuhiro Horiuchi

Kenta Nishibara

Dai Nishimura

Masahiro Kimura

Hiroyuki Tanaka

Takashi Mimura

Yasushi Takada

Jun Sakamoto

Shigetoshi Maekawa

Risa Taniguchi

Junji Michizoe

Kenta Nishihara

Kazuma Matsui

Yuuichi Nakajima

Hiroko Tanaka

Kohei Sato

Keiichi Kamon

Do Kyun Kim

Naoki Imazu

A low cost porous film has high thermal dimensional stability and good adhesion with electrodes and also has excellent battery characteristics. The porous film includes a porous base and a porous layer containing particles A and particles B disposed at least on one side thereof, wherein the particles A contain a polymer having at least one selected from the monomer unit group a that consists of fluorine-containing (meth)acrylate monomer units and silicon-containing monomer units whereas the particles B are inorganic particles.

Porous film including porous base and porous layer having inorganic particles and resin particles containing fluoro (meth)acrylate-containing or silicon-containing polymer, separator for secondary batteries, and secondary battery

A porous film includes a porous substrate, and a porous layer laminated on at least one surface of the porous substrate. The porous layer contains an organic resin different from a resin constituting the porous substrate. A height of a projection of the porous layer in an interface between the porous substrate and the porous layer is 200 nm or more, and a distance between projections is 1 &#x3bc;m or more.

Porous film, separator for secondary batteries, and secondary battery

At low cost, a porous film has high thermal film rupture resistance and outstanding battery characteristics. The porous film has a porous layer on at least one surface of a porous substrate, and if the surface porosity of the porous layer is defined as &#x3b1; and the cross-sectional void ratio of the porous layer is defined as &#x3b2;, then &#x3b1;/&#x3b2; does not exceed 90%.

Porous film, separator for rechargeable battery, and rechargeable battery

A porous film includes a porous substrate, and a porous layer provided on at least one surface of the porous substrate. The porous layer includes the following resin A and resin B, and satisfies that &#x3b1;/&#x3b2; is less than 1.0, where &#x3b1; is a surface opening ratio of the porous layer and &#x3b2; is a cross-sectional porosity of the porous layer. The resin A is a resin having a melting point of 150&#xb0; C. or higher, or a resin having no substantial melting point. The resin B is a resin having a melting point of lower than 150&#xb0; C., or an amorphous resin.

A secondary battery separator includes a porous base material; and a porous layer stacked on at least one surface of the porous base material, the porous layer being mainly composed of inorganic particles, and two or more organic resins having different melting points, the porous layer including a fluororesin as at least one of the organic resins, the secondary battery separator satisfying at least one of (A) and/or (B): (A) the porous layer has a melting point of 130&#xb0; C. or higher and 20&#xb0; C. or higher and lower than 130&#xb0; C.; and (B) the porous layer has a melting point of 130&#xb0; C. or higher, and includes an amorphous organic resin.

Secondary battery separator and secondary battery

A laminated film includes, at least on one side thereof, a layer containing a hardening resin, having a total thickness of 1 to 100 &#x3bc;m, a light transmittance of 70% or more at a wavelength of 400 nm, a Young's modulus of 5 GPa or more when applying a nanoindenter to make a 1 &#x3bc;m depression in the thickness direction into the surface of the hardening layer, and undergoing a rate of deformation of 500 ppm or less after applying a stress of 0.5 MPa for 30 minutes.

Multilayer film

An ion-permeable membrane is substantially free of holes and has excellent ion permeability, heat resistance, strength, and flexibility, and can form a battery electrolyte membrane that uses the ion-permeable membrane, and an electrode composite. The polymer-ion-permeable membrane has a per-unit-thickness puncture strength of 0.3-3.0 N/&#x3bc;m and a membrane resistance of 3.0-100.0 &#x3a9;&#xb7;cmat 25&#xb0; C.

Polymer-ion-permeable membrane, composite-ion-permeable membrane, battery electrolyte membrane, and electrode composite

An ion-permeable membrane is substantially free of holes and has excellent ion permeability, heat resistance, strength, and flexibility. A battery electrolyte membrane uses the ion-permeable membrane, and can form an electrode composite body. The polymer-ion-permeable membrane has an average radius of free volume of 0.32-0.50 nm.

An aromatic polyamide porous film has a total number of branch points of pores in an area of 3 cubic micrometers obtained by three-dimensional structural analysis is 2,000 to 20,000, which ensures high rate characteristics and is also capable of suppressing deterioration of cycle characteristics and storage characteristics as well as abnormal heat generation, when used as a separator for battery, and also has excellent heat resistance; and a separator for battery and a battery, each including the aromatic polyamide porous film.

Aromatic polyamide porous film, separator for battery, and battery

The present invention relates to a retardation film using polyester having a photoelastic coefficient of &#x2212;40&#xd7;10Pato 40&#xd7;10Pa. The present invention also relates to a polyester resin for optical use which contains a phosphorus compound, and an alicyclic component and a fluorene derivative component as constituents, and satisfies the following equations (6) and (7):100&#xb0; C.&#x2266;glass transition temperature&#x2266;150&#xb0; C.&#x2003;&#x2003;(6)and1.0&#x2266;(/2+)/&#x2266;5.0&#x2003;&#x2003;(7),wherein Ma is the number of moles of an alkali metal element contained in 1 ton of the polyester resin, Mb is the number of moles of an alkaline earth metal element contained in 1 ton of the polyester resin, Mc is the sum of the number of moles of a zinc element (Zn), a cobalt element (Co) and a manganese element (Mn) contained in 1 ton of the polyester resin, and P is the number of moles of a phosphorus element contained in 1 ton of the polyester resin.

Retardation film and polyester resin for optical use

A porous film includes aromatic polyamide as a constituent component that has high heat resistance, high air permeability and high affinity to electrolytes. It is a porous aromatic polyamide film including aromatic polyamide and a hydrophilic polymer, wherein the hydrophilic polymer accounts for 12 to 50 parts by mass per 100 parts by mass of the aromatic polyamide, the thickness being 2 to 30 micrometers, the Gurley air permeability being 0.5 to 300 seconds/100 ml, and the thermal shrinkage rate being &#x2212;0.5 to 1.0% at 200&#xb0; C.

Aromatic polyamide porous film and separator for capacitor or battery using the same

A conventional liquid crystal display comprises a number of components, so that a manufacturing cost cannot be reduced. Furthermore, a large-area substrate has problems in shipping. According to this invention, a liquid-crystal panel is prepared by forming individual optically functional films, a TFT device and a light-emitting device on a long thin film and then laminating the film by a transfer process. A base film to be a substrate in a liquid-crystal panel preferably has a thickness of 10 &#x3bc;m to 200 &#x3bc;m, a curvature radius of 40 mm or less as a measure of flexibility and a coefficient of thermal expansion of 50 ppm/&#xb0; C. or less. Furthermore, it more preferably gives a variation of &#xb1;5% or less in mechanical and optical properties to a thermal history at 200&#xb0; C.

Light-condensing film, liquid-crystal panel and backlight as well as manufacturing process for light-condensing film

A polyamide having at least an alicyclic or aromatic group exhibiting a light transmittance of 80% or more in the wavelength region of 450 to 700 nm is produced by using an aramide polymer comprising specific structural units at an amount of 50 mol % or more. Colorless transparent alicyclic or aromatic polyamide films having high rigidity and high thermal resistance are provided by using the polyamide. Further, the invention provides various optical members made by using the polyamide or the polyamide films, and polyamide copolymers.

Alicyclic or aromatic polyamides, polyamide films, optical members made by using the same, and polyamide copolymers

The problem addressed by this invention is to provide an aromatic polyamide porous film excellent in the capability of being thinned and capable of easily exhibiting stable porosity properties even if it is used for a long period of time at high temperature. This invention can be achieved by an aromatic polyamide porous film that contains an aromatic polyamide as a main component and is such that when an atomic force microscope is used to measure a range of S &#x3bc;mat least on one surface, the sectional area S(10) &#x3bc;mobtained at a depth of 10 nm from the surface and the sectional area S(20) &#x3bc;mobtained at a depth of 20 nm from the surface satisfy the following formulae simultaneously.0.01&#x2266;(10)/&#x2266;0.35&#x2266;(20)/(10)&#x2266;20

Aromatic polyamide porous film, process for producing the same and secondary battery

A compound having an oxadiazole structure which is obtained by dehydration-cyclization of a compound having a carbohydrazide structure using a chemical agent selected from acids and bases. The dehydration-cyclization of the compound having a carbohydrazide structure can be conducted under mild conditions at low cost.

Method for producing a film of an aromatic amide oxadiazole polymer containing an oxadiazole structure and the film so produced

Growing community of inventors

Otsu, Japan

Akimitsu Tsukuda