Toray Battery Separator Film Co., Ltd.

Tonen Chemical Corporation

Toray Tonen Specialty Separator Godo Kaisha

Toray Industries, Inc.

Kotaro Kimishima

Sadakatsu Suzuki

Koichi Kono

Patrick Brant

Kotaro Takita

Hiroyuki Ozaki

Satoshi Ueki

Zerong Lin

Jeffrey Lawrence Brinen

Naoki Mizuno

Shintaro Kikuchi

Fumiyasu Nomura

Norimitsu Kaimai

Kazuhiro Yamada

Shigeaki Kobayashi

Osamu Kitamura

Kazuki Kiso

Jeffery Lawrence Brinen

Akihisa Maki

A method for plasma-treating a porous body, comprising the steps of generating plasma using an inert gas or a mixed gas of an inert gas and a reactive gas, (a) blowing the resultant plasma gas to the porous body at a flow rate per a unit area of the porous body of 0.002 to 2 L/minute/cm, (b) sucking the porous body in a plasma gas atmosphere, or (c) sucking the porous body while blowing the plasma gas to the porous body at said flow rate, thereby treating the plasma the surfaces and pores of said porous body with plasma.

Method and apparatus for plasma-treating porous body

A method for removing a process solvent (P-sol) from a polymer extrudate, especially in connection with a process for producing a microporous membrane. The method involves contacting the extrudate with chlorinated hydrocarbon (CHC) and hydrofluoroether (HFE) in a first stage; contacting the extrudate from the first stage with HFE in a second stage; combining the first and second waste streams and then separating the P-sol from the combined streams to make an HFE-CHC stream; cooling the HFE-CHC stream to make an HFE-rich phase and a CHC-rich phase; and conducting the CHC-rich phase and/or the HFE-rich phase to step (A).

Method for removing diluent from a polymer extrudate, and its applications

The invention relates to a method for removing diluent from a polymer extrudate, especially in connection with a process for producing a microporous membrane. The method involves contacting the extrudate with a second solvent in a first stage; contacting the extrudate from the first stage with a third solvent in a second stage; conducting a first stream away from the first stage and/or conducting a second stream away from the second stage; and cooling at least a portion of the first and/or second stream and separating therefrom at least one of a first phase rich in the second solvent or a second phase rich in the third solvent.

Method for removing diluent from an extrudate of a polymer solution

The invention relates to a microporous membrane. The membrane can have an average thickness of 23 ?m or more, an air permeability in a range of about 20 sec/100 cmto 100 sec/100 cm, a pin puncture strength of 2,450 mN or more, and a heat shrinkage ratio of 12% or less at 105&#xb0; C. The membrane can be produced from a polyolefin solution made by combining a membrane-forming solvent and at least one polyolefin resin containing polyethylene having a viscoelastic angular frequency ??0#191 of at least about 0.01 rad/sec.

Microporous polyolefin membrane comprising a polyethlene resin having a specific viscoelastic angular frequency, its production method, battery separator and battery comprising the same

A microporous polyethylene membrane having well-balanced permeability, mechanical properties, heat shrinkage resistance, compression resistance, electrolytic solution absorbability, shutdown properties and meltdown properties, with an average pore diameter changing in a thickness direction is produced by melt-blending a polyethylene resin and a membrane-forming solvent to prepare a solution A having a resin concentration of 25 to 50% by mass and a solution B having a resin concentration of 10 to 30% by mass, the resin concentration in the solution A being higher than that in the solution B, (a) simultaneously extruding the resin solutions A and B through a die, cooling the resultant extrudate to provide a gel-like sheet in which the resin solutions A and B are laminated, and removing the membrane-forming solvent from the gel-like sheet, or (b) extruding the resin solutions A and B through separate dies, removing the membrane-forming solvent from the resultant gel-like sheets A and B to form microporous polyethylene membranes A and B, and alternately laminating the microporous polyethylene membranes A and B, while easily controlling the average pore diameter distribution in the microporous polyethylene membrane in a thickness direction.

Production method of microporous polyethylene membrane and battery separator

A microporous composite membrane comprising a microporous polyolefin membrane and a polypropylene-based coating layer formed on at least one surface of the microporous polyolefin membrane, the polypropylene having a mass-average molecular weight within a range of 5,000-500,000, and solubility of 0.5 g or more in 100 g of toluene at a temperature of 25&#xb0; C., and the microporous composite membrane having air permeability (converted to the value at 25-&#x3bc;m thickness) of 50-10,000 seconds/100 cc.

Microporous composite membrane and its producing method and use

A microporous polyolefin membrane comprising a polyethylene resin, and polypropylene having a weight-average molecular weight of 6&#xd7;10or more and a heat of fusion of 90 J/g or more (measured by a differential scanning calorimeter), a fraction having a molecular weight of 1.8&#xd7;10or more being 10% or more by mass of the polypropylene.

Microporous polyolefin membrane, its production method, and battery separator

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Yokohama, Japan

Kotaro Kimishima