Black porous polytetrafluoroethylene membrane, method for producing same, gas-permeable membrane and ventilation member using same
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United States of America Patent
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Apr 11, 2017
Grant Date -
Jun 18, 2015
app pub date -
Jun 3, 2013
filing date -
Aug 2, 2012
priority date (Note) -
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Abstract
Provided is a black porous polytetrafluoroethylene membrane including a porous polytetrafluoroethylene membrane dyed black. A whiteness of a principal face of the black porous polytetrafluoroethylene membrane as measured according to JIS L 1015 (Hunter method) is 18.0 to 23.0%, and the whiteness of the principal face falls within a range of 18.0 and 25.0% after heating at 350° C. for 1 minute. This black porous PTFE membrane is suitable as a gas-permeable membrane that blocks entry of water and/or dust and that allows permeation of gases; specifically, the black porous PTFE membrane is suitable, for example, as a waterproof sound-transmitting membrane, a waterproof gas-permeable membrane, and a dustproof gas-permeable membrane.
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