Polyolefin microporous membrane
AssigneeToray Industries, Inc.
InventorsYukiko Miura, Naofumi Yasuda, Nobuaki Suzuki
Life of this patent
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Abstract
A polyolefin microporous membrane has a microporous structure with a small pore size and a highly superior air permeability and the like. The polyolefin microporous membrane includes at least a first layer and a second layer, wherein the first layer is composed of a first polyolefin resin containing polyethylene, wherein the second layer is composed of a second polyolefin resin containing polyethylene and polypropylene, and wherein the polyolefin microporous membrane satisfies (I) and (II); and the like. (I) The polyolefin microporous membrane has an air resistance of from 10 to 200 sec/100 ml. (II) The polyolefin microporous membrane has a bubble point pore size of from 5 to 35 nm.
Claims10
-9. (canceled)
A polyolefin microporous membrane comprising at least a first layer and a second layer,
- wherein said first layer is composed of a first polyolefin resin containing polyethylene,
- said second layer is composed of a second polyolefin resin containing polyethylene and polypropylene, and
- said polyolefin microporous membrane satisfies (I) and (II):
- (I) said polyolefin microporous membrane has an air resistance of 10 sec/100 ml or more and 200 sec/100 ml or less;
- and
- (II) said polyolefin microporous membrane has a bubble point pore size of 5 nm or more and 35 nm or less.
Dependencies are inferred from the claim text.