E.i. Dupont De Nemours and Company

Allan Harold Olson

Clay Woodward Jones

Ralph Munson Aten

Thomas Joseph Leck

Michael Fryd

Subhash Vishnu Gangal

Dewey Lynn Kerbow

Dana P Carlson

Peter L Huesmann

Copolymers of tetrafluoroethylene and perfluoro(ethyl vinyl ether) having perfluoro(ethyl vinyl ether) content of at least 3 wt % exhibit excellent toughness even at melt viscosities of no greater than 25.times.10.sup.3 Pa.s. The copolymers can advantageously be made by aqueous dispersion copolymerization of the monomers in the absence of alkaline buffer and preferably in the absence of organic solvent.

Tetrafluoroethylene copolymer

An aqueous dispersion contains melt-fabricable fluoropolymer particles and acrylic copolymer particles, said acrylic copolymers having a decomposition temperature of less than 340.degree. C., wherein the dispersion contains about 75 to about 95 wt % of fluoropolymer and about 5 to about 25 wt % of acrylic copolymer, based on combined weights of the two polymers. Coated articles comprise a substrate coated with a primer layer, optional intermediate coats, and a topcoat with at least the topcoat being formed from the aqueous dispersion.

Tetrafluoroethylene copolymer coating composition

A tetrafluoroethylene-perfluoro(alkyl vinyl ether copolymer in which heat unstable carbinol end-groups (--CH.sub.2 OH groups) present have been protected against heat degradation by treating the copolymer with NH.sub.3 or NH.sub.3 producing compounds.

Heat stable tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymers

Hollow glass bubble-containing aqueous dispersions of tetrafluoroethylene polymer having good shelf life are provided, said dispersions also containing nonionic surfactant and water soluble electrolyte.

Stabilized suspension of glass bubbles in an aqueous dispersion of

Tetrafluoroethylene polymer coating dispersions when coated on glass fabric improve acid resistance of the fabric if the dispersions contain a selected silane, siloxane and water repellant.

Growing community of inventors

Parkersburg, WV, United States of America

Allan Harold Olson