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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 9440382 B1

PDFFull Text
Date of Patent:
Sep. 13, 2016

Filed:

Aug. 19, 2011

Method of manufacture of polytetrafluoroethylene stretched film, and polytetrafluoroethylene stretched film

Applicants:

Hiroki Uehara, Kiryu, JP;

Takeshi Yamanobe, Kiryu, JP;

Yasumasa Yukawa, Ichihara, JP;

Yasuhiko Matsuoka, Ichihara, JP;

Inventors:

Hiroki Uehara, Kiryu, JP;

Takeshi Yamanobe, Kiryu, JP;

Yasumasa Yukawa, Ichihara, JP;

Yasuhiko Matsuoka, Ichihara, JP;

Assignee:

National University Corporation Gunma University, Gunma, JP;

Attorneys:

Nixon Peabody LLP

Khaled Shami

Primary Examiner:

Jeffrey Wollschlager

Int. Cl.
CPC ...
B29C 43/14 (2006.01); B29C 55/00 (2006.01); B29C 55/12 (2006.01); B29C 55/16 (2006.01); B29C 43/00 (2006.01); C08J 5/18 (2006.01); C08L 27/18 (2006.01); B29C 47/92 (2006.01); B29C 43/36 (2006.01); B29C 47/00 (2006.01); B29C 43/56 (2006.01); B29K 27/18 (2006.01);
U.S. Cl.
CPC ...
B29C 43/14 (2013.01); B29C 43/003 (2013.01); B29C 43/006 (2013.01); B29C 47/0057 (2013.01); B29C 47/92 (2013.01); B29C 55/00 (2013.01); B29C 55/12 (2013.01); B29C 55/16 (2013.01); C08J 5/18 (2013.01); C08L 27/18 (2013.01); B29C 47/0004 (2013.01); B29C 47/0026 (2013.01); B29C 2043/3605 (2013.01); B29C 2043/366 (2013.01); B29C 2043/561 (2013.01); B29C 2947/92266 (2013.01); B29C 2947/92514 (2013.01); B29C 2947/92704 (2013.01); B29C 2947/92761 (2013.01); B29K 2027/18 (2013.01); B29K 2995/0053 (2013.01); C08J 2327/18 (2013.01); C08L 2205/02 (2013.01);
Abstract

A method of manufacturing a PTFE stretched film that has higher tensile strength at its breaking point. In the method, a resin composition is obtained by mixing an emulsion of PTFE (A) with a number average molecular weight of 5×106 or more and an emulsion of PTFE (B) with a number average molecular weight of 1×106 to 4×106 so that the solid content ratio (A/B) of the PTFE (A) and the PTFE (B) is 99/1 to 10/90. The mixed emulsion is subjected to compression molding in a melted state under a reduced-pressure atmosphere to obtain a film.

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