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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 9790358 B1

PDFFull Text
Date of Patent:
Oct. 17, 2017

Filed:

Apr. 20, 2015

Blended fluoropolymer compositions

Applicant:

Whitford Corporation, Elverson, PA (US);

Inventors:

Leonard W. Harvey, Downington, PA (US);

Michael Coates, Elverson, PA (US);

Julie K. Wright, Widnes, GB;

Assignee:

Whitford Corporation, Elverson, PA (US);

Attorney:

Faegre Baker Daniels LLP

Primary Examiner:

Nicole M Buie-Hatcher

Int. Cl.
CPC ...
C08L 27/18 (2006.01); C08L 29/10 (2006.01); C08L 27/12 (2006.01); C08L 27/24 (2006.01); C08J 3/00 (2006.01); C08J 3/12 (2006.01); C09D 5/03 (2006.01); C09D 127/18 (2006.01); C09D 127/12 (2006.01); C09D 129/10 (2006.01);
U.S. Cl.
CPC ...
C08L 27/18 (2013.01); C08J 3/005 (2013.01); C08J 3/12 (2013.01); C08L 27/12 (2013.01); C08L 27/24 (2013.01); C08L 29/10 (2013.01); C09D 5/03 (2013.01); C09D 127/12 (2013.01); C09D 127/18 (2013.01); C09D 129/10 (2013.01); C08J 2327/18 (2013.01); C08L 2201/50 (2013.01); C08L 2205/02 (2013.01); C08L 2205/025 (2013.01); Y10T 428/2982 (2015.01);
Abstract

Blended fluoropolymer compositions are provided. In one embodiment, a liquid dispersion of a first fluoropolymer is blended with a liquid dispersion of a second fluoropolymer. The first fluoropolymer may be polytetrafluoroethylene (PTFE), such as a low molecular weight PTFE (LPTFE) that has been polymerized via a dispersion or emulsion polymerization process, and which has not been agglomerated, irradiated, or thermally degraded. The LPTFE may be in the form of an aqueous dispersion, having a mean particle size of less than 1.0 microns (μm), with the LPTFE having a first melt temperature (T) of 332° C. or less. The second fluoropolymer may be a melt processable fluoropolymer (MPF), such as fluorinated ethylene propylene (FEP), in the form of an aqueous dispersion, and having a mean particle size of less than 1.0 microns (μm). Blending of the dispersions facilitates interaction of the LPTFE and MPF on a submicron level to facilitate intimate blending such that, when the blended fluoropolymer composition is dried, a crystal structure representing a true alloy of the fluoropolymers is formed, having melt characteristics that differ from those of the individual fluoropolymers. The blended fluoropolymer composition may be used to provide a coating having improved impermeability, stain resistance, abrasion resistance, smoothness, and higher contact angles.

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