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US 2019/0318884 A1Published application
Separator for capacitor
AssigneeKuraray Co., Ltd.
InventorsTomohiro HAYAKAWA, Toshimichi KUSUNOKI, Masami KAWAKAMI
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Abstract
An object of the present invention is to provide: a capacitor separator which not only has a high strength but also exhibits a low internal resistance when used in a capacitor; and a method of producing the same. The present invention relates to A capacitor separator comprising fibrillated fibers consisting of a polyvinyl alcohol-based resin in an amount of not less than 30% by weight based on a total weight of the separator.
Claims9
1:
- A capacitor separator, comprising:
- fibrillated fibers consisting of a polyvinyl alcohol-based resin in an amount of not less than 30% by weight based on a total weight of the capacitor separator.
2:
- The capacitor separator according to claim 1, wherein the fibrillated fibers are in a cotton-like form.
3:
- The capacitor separator according to claim 1, wherein the fibrillated fibers have an aspect ratio of 500 or higher.
4:
- The capacitor separator according to claim 1, comprising the polyvinyl alcohol-based resin as a binder in an amount of not greater than 15% by weight.
5:
- The capacitor separator according to claim 1, wherein the fibrillated fibers have a CSF of 5 to 500 ml.
6:
- The capacitor separator according to claim 1, having a thickness of from 20 to 80 μm and a specific tensile strength of not less than 30 N·m/g.
7:
- A method of producing the capacitor separator according to claim 1, the method comprising:
- fibrillating readily fibrillatable polyvinyl alcohol fibers that comprise a polyvinyl alcohol and a polyalkylene oxide.
8:
- The method according to claim 7, wherein a weight ratio of the polyalkylene oxide in the readily fibrillatable polyvinyl alcohol fibers is 3 to 40% by weight with respect to a total amount of the polyvinyl alcohol and the polyalkylene oxide.
9:
- A capacitor comprising the capacitor separator according to claim 1.