Asahi Kasei E-Materials Corporation

Asahi Kasei Battery Separator Corporation

Asahi Kasei Kabushiki Kaisha

Yuzuru Sakakibara

Keitaro Ameyama

Masahiro Ohashi

Xun Zhang

Yuka Sato

Kosuke Mizobuchi

Provided is a microporous film which has a surface A and a surface B opposite to the surface A. In one embodiment, the microporous film has a ratio (F/F) of a dynamic friction coefficient Fof the surface B to a dynamic friction coefficient Fof the surface A of 1.2 to 20. In another embodiment, the microporous film is a single layer having a thickness of 3-18 μm, a number Nof pores on the surface A is 10-100/μm, a number Nof pores on the surface B is 20-200/μm, and N/Nis 0.2-0.96. In addition, a total area Sof pores on the surface A is 0.02-0.5 μm/μm, a total area Sof pores on the surface B is 0.01-0.3 μm/μm, and S/Sis 1.1-10. Furthermore, in another embodiment, a number Wof protrusion-like bodies on the surface B is 0.2-1000/100 μm.

Microporous film, and method for producing same

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

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

Yuzuru Sakakibara