Tonen Chemical Corporation

Toray Battery Separator Film Co., Ltd.

Toa Nenryo Kogyo Kabushiki Kaisha

Toray Industries, Inc.

Toray Tonen Specialty Separator Godo Kaisha

Tonen Corporation

Tonen Chemical Company

Kawabi & Associates

Koichi Kono

Kotaro Takita

Patrick Brant

Norimitsu Kaimai

Takeshi Ishihara

Satoshi Miyaoka

Hidehiko Funaoka

Hiroyuki Ozaki

Zerong Lin

Shigeaki Kobayashi

Jeffrey Lawrence Brinen

Kohtaro Kimishima

Donna Jean Crowther

Kenji Miyasaka

Jyoichi Tabuchi

Kazuhiro Yamada

Shoichi Mori

Shintaro Kikuchi

Kotaro Kimishima

Kenkichi Okamoto

Toshihiko Kaneda

Go Sato

Takuji Itoh

Masami Sugata

Tetsuro Nogata

Soichiro Yamaguchi

Tomiko Matsumoto

Tatsuya Takashima

Jeffery Lawrence Brinen

Teiji Nakamura

Kazuki Kiso

Shuichi Sawada

Rumi Iwasaki

Kazuo Saeki

Satoshi Miyaoki

A polyolefin microporous membrane is disclosed. The membrane includes a polyolefin resin having an MFR value of not greater than 2.0 g/10 min, and a crystal nucleating agent. The polyolefin microporous membrane has an air permeation resistance scaled to a thickness of 20 &#x3bc;m of from 100 to 500 sec/100 cc, a porosity of from 20% to 60%, and a mean flow pore size of not greater than 100 nm.

Polyolefin microporous membrane, production method therefor, and battery separator

A polyolefin microporous membrane is disclosed. The polyolefin microporous membrane includes a polyolefin resin, where the polyolefin resin contains at least 80 mass % polypropylene resin, and where the polyolefin microporous membrane has a maximum pore size of less than 30.0 nm and a mean flow pore size of less than 20.0 nm.

Polyolefin microporous membrane, method for producing same, and battery separator

A polyolefin microporous membrane is disclosed. The membrane includes at least one microporous membrane layer, where the microporous membrane layer has an air permeability between about 100 sec/100 cc and about 220 sec/100 cc, a pin puncture strength of at least 550 gf, and a crystallization half time tof from 10 to 35 minutes when subjected to isothermal crystallization at 117&#xb0; C. The air permeability and the pin puncture strength are normalized to a thickness of 16 &#x3bc;m.

Polyolefin microporous membrane and production method thereof

A polyolefin microporous membrane includes a polyethylene composition, and 0.5% or more but less than 5% by mass of polypropylene, wherein the polyethylene composition includes polyethylene having a mass average molecular weight of 2.5&#xd7;10to 5&#xd7;10and ultrahigh molecular weight polyethylene having a mass average molecular weight of 1&#xd7;10to 3&#xd7;10in an amount of more than 5% by mass and not more than 50% by mass based on 100% by mass of polyethylene composition and has a molecular weight distribution (Mw/Mn) of 5.0 to 300, and the polyolefin microporous membrane has an injection of electrolyte of 20 seconds or less and a uniform polypropylene distribution in at least one plane perpendicular to the thickness direction.

Polyolefin microporous film and method of producing same

A multilayer microporous membrane including polymer and having a shutdown temperature of &#x2266;130.5&#xb0; C. and a storage stability of 0.3V or less.

Microporous polymeric membranes, battery separators, and production methods therefor

A polyolefin microporous membrane is produced by forming a gel-like molding using a polyolefin resin containing polypropylene, and stretching the molding in at least one direction, followed by washing, the polyolefin microporous membrane having an injection of electrolyte of 20 seconds or less and a uniform polypropylene distribution in at least one plane perpendicular to the thickness direction.

Polyolefin microporous film and method for producing same

A microporous membrane includes a low melting polypropylene, the low melting polypropylene being a polypropylene homopolymer or copolymer having an MFR&#x2267;2.0&#xd7;10, a Tm of 85.0&#xb0; C. to 130.0&#xb0; C., and a Te-Tm&#x2266;10&#xb0; C.

Microporous film, methods for making such film, and use for such film as battery separator film

A multi-layer, microporous polyolefin membrane having at least three layers, which comprises first microporous layers made of a polyethylene resin for constituting at least both surface layers, and at least one second microporous layer comprising a polyethylene resin and polypropylene and disposed between both surface layers, the heat of fusion (&#x394;H) of the polypropylene measured by differential scanning calorimetry being 90 J/g or more, and the polypropylene content in the second microporous layer being 50% or less by mass based on 100% by mass of the total of the polyethylene resin and the polypropylene.

Multi-layer microporous polyolefin membrane and battery separator

The invention relates to microporous membranes comprising polymer and having well-balanced permeability, shutdown temperature, and pin puncture strength. The invention also relates to methods for making such membranes, and the use of such membranes as battery separator film in, e.g., lithium ion secondary batteries.

Microporous membranes, methods for making such membranes, and the use of such membranes as battery separator film

The invention relates to microporous membranes comprising polymer and having well-balanced permeability, shutdown temperature, and pin puncture strength. The invention also relates to methods for making such membranes, and the use of such membranes as battery separator film in, e.g., lithium ion secondary batteries. The membrane has a shutdown temperature &#x3c;130.5&#xb0; C.

The invention relates to microporous polymeric membranes suitable for use as battery separator film. The membrane comprises polyethylene, polypropylene, and polymethylpentene. The invention also relates to a method for producing such a membrane, batteries containing such membranes as battery separators, methods for making such batteries, and methods for using such batteries.

Microporous film, process for production of the film, and use of the film

The present invention relates to microporous membranes comprising polymer and having well-balanced permeability and heat shrinkage, especially heat shrinkage at elevated temperature. The invention also relates to methods for making such membranes, and the use of such membranes as battery separator film in, e.g., lithium ion secondary batteries.

The invention relates to microporous membranes having high meltdown temperature, high air permeability, and high puncture strength. The invention also relates to the production of such membranes and the use of such membranes as battery separator film.

Microporous membranes, methods for making these membranes, and the use of these membranes as battery separator films

A microporous polyethylene membrane made of a polyethylene resin having a ratio (mass-average molecular weight/number-average molecular weight) of 5 to 300 and comprising 1% or more by mass of ultra-high-molecular-weight polyethylene having a mass-average molecular weight of 7&#xd7;10or more, the microporous polyethylene membrane comprising (a) a coarse-structure layer having an average pore diameter of more than 0.04 &#x3bc;m, which is formed on at least one surface, and (b) a dense-structure layer having an average pore diameter of 0.04 &#x3bc;m or less, an area ratio of the coarse-structure layer to the dense-structure layer in a membrane cross section being 0.1 to 0.8.

Microporous polyethylene membrane, its production method, and battery separator

A microporous membrane comprising layers, wherein at least one layer comprises a first polymer having a Tm in the range of 115.0&#xb0; C. to 130.0&#xb0; C. and an Mw of from 5.0&#xd7;10to 4.0&#xd7;10, and the membrane has a shutdown temperature&#x2266;130.5&#xb0; C. and a rupture temperature&#x2267;170.0&#xb0; C.

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Asaka, Japan

Koichi Kono