Invention Grant
- Patent Title: Blended fluoropolymer compositions
- Patent Title (中): 混合的含氟聚合物组合物
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Application No.: US12468580Application Date: 2009-05-19
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Publication No.: US08691344B2Publication Date: 2014-04-08
- Inventor: Leonard W. Harvey , Michael Coates , Julie K. Wright
- Applicant: Leonard W. Harvey , Michael Coates , Julie K. Wright
- Applicant Address: US PA Elverson
- Assignee: Whitford Corporation
- Current Assignee: Whitford Corporation
- Current Assignee Address: US PA Elverson
- Agency: Faegre Baker Daniels LLP
- Main IPC: B05D3/02
- IPC: B05D3/02

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 (Tm) of 332° C. or less. The second fluoropolymer may be a melt processible fluoropolymer (MPF), such as methylfluoroalkoxy (MFA), fluorinated ethylene propylene (FEP), or perfluoroalkoxy (PFA), for example, 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.
Public/Granted literature
- US20090317553A1 BLENDED FLUOROPOLYMER COMPOSITIONS Public/Granted day:2009-12-24
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