3M Innovative Properties Company

Karl D Weilandt

Klaus Hintzer

Tilman C Zipplies

Harald Kaspar

Tatsuo Fukushi

Yuta Suzuki

Kai Helmut Lochhaas

Denis Duchesne

Lisa P Chen

Peter J Scott

Herbert Koenigsmann

Helmut Traunspurger

Florian D Jochum

Jens Schrooten

Allen M Sohlo

Tamon Aoki

Steffen Vowinkel

Mark W Muggli

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.

Latex blends of amorphous perfluorinated polymers and articles derived therefrom

Method of reducing the amount of a fluorinated acid or its salts from a fluoropolymer, the method comprises: (i) providing a composition containing particles of the fluoropolymer, (ii) contacting the fluoropolymer particles with a treatment composition comprising at least one organic liquid; and, optionally, further comprising (iii) isolating, washing and subjecting the fluoropolymer to drying treatment, and wherein the fluoropolymer contains units derived from tetrafluoroethene (TFE) and is selected from the group of fluoroelastomers and the group of fluoropolymers having a melting point of less than 150° C. Also provided are fluoropolymer and compositions containing such polymers that are essentially free of fluorinated acids and their salts.

Fluoropolymers with very low amounts of a fluorinated alkanoic acid or its salts

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Afton, MN, United States of America

Karl D Weilandt