POROUS POLYTETRAFLUOROETHYLENE FILM AND WATERPROOF AIR-PERMEABLE MEMBER

Provided is a porous polytetrafluoroethylene (PTFE) membrane that satisfies the following expressions: 0.2 ‰¤ F ‰¤ 4.0; 0.2 ‰¤ R ‰¤ 1.0; and R ‰¥ -0.1F + 0.5, for the Frazier number F [cm 3 /sec/cm 2 ] and the water entry pressure R [MPa]. This porous PTFE membrane may be a single-layer membrane. Th...

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Bibliographic Details
Main Authors ISHII, Kyoko, AIZAWA, Seiji
Format Patent
LanguageEnglish
French
German
Published 28.04.2021
Subjects
AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G
CHEMISTRY
COMPOSITIONS BASED THEREON
GENERAL PROCESSES OF COMPOUNDING
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
WORKING-UP
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Summary:Provided is a porous polytetrafluoroethylene (PTFE) membrane that satisfies the following expressions: 0.2 ‰¤ F ‰¤ 4.0; 0.2 ‰¤ R ‰¤ 1.0; and R ‰¥ -0.1F + 0.5, for the Frazier number F [cm 3 /sec/cm 2 ] and the water entry pressure R [MPa]. This porous PTFE membrane may be a single-layer membrane. This porous PTFE membrane has the properties suitable for use as a waterproof air-permeable membrane, and achieves a good balance between high water resistance and high air permeability.
Bibliography:Application Number: EP20120876169