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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 10730219 B1

PDFFull Text
Date of Patent:
Aug. 04, 2020

Filed:

Oct. 18, 2017

Method for producing fluororesin film

Applicant:

Agc Inc., Chiyoda-ku, JP;

Inventors:

Yoshiaki Higuchi, Chiyoda-ku, JP;

Seigo Kotera, Chiyoda-ku, JP;

Assignee:

AGC Inc., Chiyoda-ku, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Jacob T Minskey

Assistant Examiner:

Virak Nguon

Int. Cl.
CPC ...
B29C 48/08 (2019.01); B29C 48/30 (2019.01); B29C 48/305 (2019.01); B29C 48/25 (2019.01); C08F 214/26 (2006.01); B29C 48/92 (2019.01); C08F 214/18 (2006.01); B29K 27/12 (2006.01); B29L 7/00 (2006.01); B29C 48/88 (2019.01); B29C 48/00 (2019.01);
U.S. Cl.
CPC ...
B29C 48/08 (2019.02); B29C 48/2511 (2019.02); B29C 48/2515 (2019.02); B29C 48/30 (2019.02); B29C 48/3001 (2019.02); B29C 48/305 (2019.02); B29C 48/92 (2019.02); C08F 214/18 (2013.01); C08F 214/262 (2013.01); C08F 214/265 (2013.01); B29C 48/022 (2019.02); B29C 48/914 (2019.02); B29C 2948/926 (2019.02); B29C 2948/92704 (2019.02); B29C 2948/92904 (2019.02); B29K 2027/12 (2013.01); B29L 2007/008 (2013.01);
Abstract

To provide a method for producing a fluororesin film, whereby defects due to deterioration (such as fish-eyes due to gelation) of a melt-processable fluororesin are less likely to occur during the production. A method for producing a fluororesin film, which comprises extruding a fluororesin material containing a melt-processable fluororesin through an extruder die, wherein the temperature of the extruder die is from 305 to 355° C., and the average flow velocity vof the fluororesin material as obtained by v=Q/A, is at least 1×10m/sec. Here, when the distance from the flow inletof the extruder die to the end of the manifoldof the extruder die is set to be x=1, Qis the flow rate (m/sec) of the fluororesin material flowing in the manifoldat a position of x=0.95 from the flow inlet, and Ais the cross-sectional area (m) of the manifoldat a position of x=0.95 from the flow inlet

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