Asahi Kasei E-materials Corporation

Asahi Kasei Kabushiki Kaisha

Keitaro Ameyama

Masahiro Ohashi

Yuzuru Sakakibara

Hiroshi Miyazawa

Takashi Shuto

Satoshi Hashimoto

Kimio Imaizumi

Koichiro Azuma

Masatoshi Ikemi

An object is to provide a separator excellent in adhesiveness to electrodes and a separator for an electricity storage device also excellent in handling performance. A separator for an electricity storage device having a polyolefin microporous film and a thermoplastic polymer coating layer covering at least a part of at least one of surfaces of the polyolefin microporous film, in which the thermoplastic polymer coating layer, on the polyolefin microporous film, has a portion containing a thermoplastic polymer and a portion not containing the thermoplastic polymer in a sea-island configuration, the thermoplastic polymer coating layer contains the thermoplastic polymer having at least two glass-transition temperatures, at least one of the glass-transition temperatures is in a range of less than 20&#xb0; C. and at least one of the glass-transition temperatures is in a range of 20&#xb0; C. or more.

Separator for electricity storage device, laminate and porous film

Disclosed is a laminated separator including a first polyolefin microporous layer and a second polyolefin microporous layer which is laminated on the first polyolefin microporous layer and which is different from the first polyolefin microporous layer, wherein at least one of the first microporous layer and the second microporous layer includes an inorganic particle having a primary particle size of 1 nm or more and 80 nm or less.

Laminated separator, polyolefin microporous membrane, and separator for electricity storage device

A separator for electricity storage devices which comprises: a base comprising a porous film; and a thermoplastic polymer arranged on at least one surface of the base. The thermoplastic polymer has a dispersion (&#x3c3;), defined by the following numerical equation using the areas (Si) of Voronoi polygons obtained by Voronoi tessellation, of 0.01-0.7. (In the equation, Si is the measured area of each Voronoi polygon, m is an average of the measured areas of the Voronoi polygons, and n is the total number of the Voronoi polygons).

Separator for electricity storage device

Disclosed is a laminated polyolefin microporous membrane having a two-type three-layer structure in which first polyolefin microporous layers are surface layers and a second polyolefin microporous layer is an intermediate layer which is different from the first polyolefin microporous layer, in which at least one of the first polyolefin microporous layers and the second polyolefin microporous layer comprises a polypropylene-based resin in which a mass ratio of polypropylene to propylene copolymer is 0 or more and 2.29 or less, and a melting point of the polypropylene copolymer is 120&#xb0; C. or higher and 145&#xb0; C. or lower. Also disclosed is a method of making the same.

Laminated polyolefin microporous membrane including propylene copolymer and method of producing the same

Laminated polymicroporous membrane including propylene copolymer and method of producing the same

The disclosure provides a laminated polyolefin microporous membrane having propylene-&#x3b1;-olefin copolymer and methods of producing the same. The laminated polyolefin microporous membrane has a two-type three layer structure in which first polyolefin microporous layers are surface layers and a second polyolefin microporous layer is an intermediate layer which is different from the first polyolefin microporous layer.

Growing community of inventors

Tokyo, Japan

Keitaro Ameyama