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Assignee3M Innovative Properties Company
InventorsKlaus Hintzer, Tamon Aoki, Tatsuo Fukushi, Florian D. Jochum, Peter J. Scott, Yuta Suzuki, Karl D. Weilandt, Steffen Vowinkel
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Described herein is a latex blend comprising (i) an amorphous perfluoropolymer and (ii) an aqueous dispersion of semi crystalline fluoropolymer particles, wherein the particles comprise a TFE homopolymer or a TFE copolymer comprising no more than 1 wt % of a second fluorinated monomer, wherein the semi crystalline fluoropolymer particles (a) have an MFI (372° C. with 2.16 kg) of less than 50 g/10 min or (b) are not melt processible and have an SSG of less than 2.190, wherein the semi crystalline fluoropolymer particles have an average diameter greater than 100 nm.
A latex blend comprising an amorphous perfluoropolymer latex and an aqueous dispersion of semi crystalline fluoropolymer particles, wherein the semi crystalline fluoropolymer particles comprise a tetrafluoroethylene copolymer wherein the tetrafluoroethylene copolymer is derived from (a) tetrafluoroethylene and (b) greater than zero and no more than 1 wt % of a fluorinated vinyl ether monomer, a fluorinated allyl ether monomer, or combinations thereof, wherein the semi crystalline fluoropolymer particles (i) have a melt flow index (372° C. with 2.16 kg) of less than 50 g/10 min or (ii) are not melt processible and have an standard specific gravity of less than 2.200, and wherein the semi crystalline fluoropolymer particles have an average diameter greater than 100 nm and wherein the latex blend after agglomeration and drying, comprises less than 500 ppb of extractable C8-C14 fluorinated alkanoic acids.
Dependencies are inferred from the claim text.