Laminated polyolefin microporous membrane including propylene-α-olefin copolymer and method of producing the same
AssigneeAsahi Kasei E-Materials Corporation
InventorsMasahiro Ohashi, Keitaro Ameyama, Yuzuru Sakakibara
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Abstract
The disclosure provides a laminated polyolefin microporous membrane having propylene-α-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.
Claims9
A laminated polyolefin microporous membrane comprising 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,
- wherein each of the first polyolefin microporous layers comprises a polyolefin resin comprising 50 to 99% by mass of polypropylene and 1 to 50% by mass of propylene-α-olefin copolymer based on a total amount of the polyolefin resin,
- wherein a content of the α-olefin in the propylene-α-olefin copolymer is more than 1% by mass and 15% by mass or less, and
- wherein each of the first polyolefin microporous layers comprises more than 30% by mass and 60% by mass or less of an inorganic filler based on a total mass of the inorganic filler and the polyolefin resin.
Dependencies are inferred from the claim text.