Toray Battery Separator Film Co., Ltd.

Toray Tonen Specialty Separator Godo Kaisha

Tonen Chemical Corporation

Kohtaro Kimishima

Patrick Brant

Koichi Kono

Kotaro Takita

Hiroyuki Ozaki

Zerong Lin

Jeffrey Lawrence Brinen

Takeshi Ishihara

Norimitsu Kaimai

Sadakatsu Suzuki

Mitsuhiro Nishida

The invention relates to a microporous membrane having a relatively low heat shrinkage values along planar axes of the membrane. The invention also relates to a battery separator formed by such microporous membrane, and a battery comprising such a separator. Another aspect of the invention relates to a method for making the multi-layer, microporous polyolefin membrane, a method for making a battery using such a membrane as a separator, and a method for using such a battery.

Microporous films, methods for their production, and applications thereof

The invention relates to a multi-layer, microporous membrane having appropriate permeability, pin puncture strength, shutdown temperature, shutdown speed, meltdown temperature, and thickness uniformity. The invention also relates to a battery separator formed by such multi-layer, microporous membrane, and a battery comprising such a separator. Another aspect of the invention relates to a method for making the multi-layer, microporous polyolefin membrane, a method for making a battery using such a membrane as a separator, and a method for using such a battery.

Multi-layer, microporous membrane, battery separator and battery

A method for producing a thermoplastic resin micro-porous film wherein a thermoplastic resin and a solvent (A) are melted and kneaded together to prepare a solution, the solution is extruded and cooled to prepare a formed product in a gel state, and the residual solvent (A) is removed from the formed product, characterized in that in the step of removing the solvent (A) use is made of a non-aqueous solvent (B) which is compatible with the solvent (A) and not compatible with the thermoplastic resin, and has a boiling point of 100&#xb0; or higher and a flashing point of 0&#xb0; or higher. The use of the non-aqueous solvent (B) provides a production method which allows the removal of a solvent with good efficiency and also with the reduction of a fear of environmental pollution and catching fire.

Method for producing microporous thermoplastic resin membrane

The invention relates to a multi-layer, microporous polyolefin membrane having appropriate permeability, pin puncture strength, shutdown temperature, shutdown speed, meltdown temperature, and thickness uniformity. The invention also relates to a battery separator formed by such multi-layer, microporous membrane, and a battery comprising such a separator. Another aspect of the invention relates to a method for making the multi-layer, microporous polyolefin membrane, a method for making a battery using such a membrane as a separator, and a method for using such a battery.

Disclosed herein is a polymer composition, its manufacture and use, said composition may comprise greater than about 90 mole % propylene monomer, and having a unique combination of properties, including one or more of the following: a heat of fusion of more than about 108 J/g, a melting point of 165&#xb0; C. or higher, a Melt Flow Rate so low that it is essentially not measurable and a molecular weight of greater than about 1.5&#xd7;10. Further disclosed herein are blends or mixtures of the present novel polymer composition and products, such as, for example, microporous film structures and the like comprising same.

Polymeric material and its manufacture and use

Disclosed herein is multi-layer, microporous polyolefin membrane comprising a first porous layer comprising primarily a polyethylene, and a second porous layer comprising a polyethylene resin and polypropylene, the polypropylene having a weight-average molecular weight of 6&#xd7;10or more and a heat of fusion (measured by a differential scanning calorimeter) of 90 J/g or more, a fraction of the polypropylene having a molecular weight of 5&#xd7;10or less being 5% or less by mass.

Microporous membrane, battery separator and battery

Disclosed herein is a multi-layer, microporous polyolefin membrane comprising a first porous layer of a polyethylene, and a second porous layer comprising a polyethylene, and polypropylene having a weight-average molecular weight of 6&#xd7;10or more and a fraction having a molecular weight of 1.8&#xd7;10or more being 10% or more by mass.

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Yokohama, Japan

Kohtaro Kimishima