Separator
AssigneeNitto Denko Corporation
InventorsNaofumi Kosaka, Keisuke Shimokita, Hironao Ootake, Asami Doi, Mizuho Chiba, Akiko Takahashi
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Abstract
A separator containing a substrate and a release layer formed on at least one side of the substrate wherein the separator shows a strain of not more than 7% when a load of 5N/20 mm is applied for one minute in the pulling direction, and when the substrate is cut in half in the thickness direction to divide the separator into two, an apparent elastic modulus in the pulling direction of one of the divided separators is larger than an apparent elastic modulus in the pulling direction of the other divided separator.
Claims5
A separator comprising a substrate and a release layer, wherein
- the separator shows a strain of not more than 7% when a load of 5N/20 mm is applied for one minute in a pulling direction,
- when the substrate is cut in half in the thickness direction to divide the separator into two, an apparent elastic modulus (E1) in the pulling direction of one of the divided separators is larger than an apparent elastic modulus (E2) in the pulling direction of the other divided separator, and the release layer is included in the divided separator having the elastic modulus (E1),
- the separator satisfies E1≥1.4×E2,
- the substrate comprises:
- a porous film;
- and
- a solid film laminated on one side of the porous film,
- the release layer is formed on the solid film,
- the porous film is a polyolefin foam,
- the solid film is a polyolefin film, and
- the release layer is formed from a silicone release agent.
Dependencies are inferred from the claim text.