Nitto-denko Corporation

Yuichi Takamura

Hiroki Kigami

Yoshinari Takayama

Shigeki Kawabe

Hiroomi Hanai

Jun Iwata

Eisuke Kurogi

Kodai Ueda

A provided stretched porous polytetrafluoroethylene membrane has an air permeability of 4 cm/(sec·cm) or more, as expressed in terms of Frazier air permeability, in a thickness direction, and has a total cohesion of 1.9 (N/20 mm)or more, the total cohesion being expressed by a product of a peel cohesion in a first in-plane direction and a peel cohesion in a second in-plane direction perpendicular to the first direction. The above stretched porous membrane is highly air-permeable and, for example, when included in a filter member, being less likely to suffer breakage at the time of handling the member or placing the member on a housing or the like.

Stretched porous polytetrafluoroethylene membrane, air-permeable medium using the same, and filter member using the same

An adhesive tape includes: a substrate made of a fluorine resin; and a silicone-based adhesive agent layer disposed on one surface of the substrate. The adhesive tape has a thickness of 50 &#x3bc;m or more. An adhesive strength of an adhesive surface to the other surface of the substrate after a friction test is 4.0 N/19 mm or more. The friction test is performed according to a test method for coefficient of friction specified in JIS K7125: 1999, and performed in a state where: a contact surface, of a sliding piece used in the test method, brought into contact with a surface to be tested is covered with a single fiber cloth (cotton, for friction) specified in JIS L0803: 2011; the other surface of the substrate is defined as the surface to be tested; and the number of times of reciprocation is set to 10 times.

Adhesive tape

The present invention relates to a pressure-sensitive adhesive tape for battery containing: a substrate; and a pressure-sensitive adhesive layer provided on at least one side of the substrate, in which the pressure-sensitive adhesive tape has a thickness change ratio of 20% or less after immersion in a mixed solvent of ethylene carbonate/diethyl carbonate [former/latter (volume ratio)=1/1] at 60&#xb0; C. for 8 hours; and a 180&#xb0; peeling adhesive strength (against aluminum foil, peel temperature: 25&#xb0; C., peel rate: 300 mm/minute) of 0.5 N/10 mm or more after the above immersion.

Pressure-sensitive adhesive tape for battery and battery using the pressure-sensitive adhesive tape

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Osaka, Japan

Yuichi Takamura