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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9616391 B1

PDFFull Text
Date of Patent:
Apr. 11, 2017

Filed:

Jun. 03, 2013

Black porous polytetrafluoroethylene membrane, method for producing same, gas-permeable membrane and ventilation member using same

Applicant:

Nitto Denko Corporation, Ibaraki-shi, Osaka, JP;

Inventors:

Masaaki Mori, Osaka, JP;

Yuri Horie, Osaka, JP;

Assignee:

NITTO DENKO CORPORATION, Osaka, JP;

Attorney:

Hamre, Schumann, Mueller & Larson, P.C.

Primary Examiner:

Jason M Greene

Int. Cl.
CPC ...
B01D 71/36 (2006.01); B01D 53/22 (2006.01); B29C 55/00 (2006.01); C08L 27/18 (2006.01); B01D 69/02 (2006.01); B01D 39/16 (2006.01); B29C 55/14 (2006.01); B01D 67/00 (2006.01); D06P 7/00 (2006.01); B29K 105/00 (2006.01); B29K 27/18 (2006.01); B29K 105/04 (2006.01); B29L 7/00 (2006.01);
U.S. Cl.
CPC ...
B01D 71/36 (2013.01); B01D 39/1692 (2013.01); B01D 67/002 (2013.01); B01D 67/0027 (2013.01); B01D 69/02 (2013.01); B29C 55/005 (2013.01); B29C 55/14 (2013.01); C08L 27/18 (2013.01); D06P 7/005 (2013.01); B01D 2325/38 (2013.01); B29K 2027/18 (2013.01); B29K 2105/0032 (2013.01); B29K 2105/04 (2013.01); B29K 2995/002 (2013.01); B29L 2007/008 (2013.01);
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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