E.i. Dupont De Nemours and Company

Charles W Stewart, Sr

Richard A Morgan

Colin Anolick

George R Chapman, Jr

Donnan E Priester

Robert Clayton Wheland

Robert E Tarney

Viacheslav Alexandrovich Petrov

Paul Douglas Brothers

Bruce E Smart

William Howard Tuminello

Anestis L Logothetis

Mark Elliot Wagman

Rita S McMinn

John G Van Alsten

Lewis E Crenshaw

Vivian M Robinson

Andrew Edward Feiring

William Brown Farnham

Weiming Qiu

Subhash Vishnu Gangal

Jerrel Charles Anderson

Peter Dwight Spohn

Dewey Lynn Kerbow

Ausat A Khan

Randall Allen Vogel

Herbert F McShane, Jr

Peter N Plimmer

Novel copolymers of fluorinated olefins and maleic anhydride, maleic acid, dichloromaleic anhydride or dichloromaleic acid may be made by using as solvents for the maleic anhydride or acid a perfluorinated alkyl carboxylic acid, or liquid or supercritical hexafluoropropylene or carbon dioxide. The resulting polymers are useful as adhesives or compatibilizing agents for fluoropolymers, and in coatings.

Copolymers of maleic anhydride or acid and fluorinated oleffins

Copolymers of maleic anhydride or acid and fluorinated olefins

Disclosed herein are novel amorphous tetrafluoroethylene-hexafluoropropylene (TFE-HFP) dipolymers, and other copolymers containing TFE, HFP and a third monomer, many of which are more random than previous amorphous TFE-HFP copolymers, as well as a novel high productivity continuous process for making these polymers. The polymers are particularly useful in the form of coatings, films and encapsulants.

Amorphous tetrafluoroethylene-hexafluoropropylene copolymers

Copolymers of tetrafluoroethylene (TFE) and hexafluoropropylene (HFP) having high HFP content and end-of-melting temperature, T.sub.m (end), as low as 200.degree. C. are disclosed. Exceptional performance as a processing aid in polyolefins results from having T.sub.m (end) of the TFE/HFP copolymer close to the processing temperature of the polyolefin. These TFE/HFP copolymers are soluble in fluorinated cyclic solvents. Copolymer/solvent systems copolymer at significant concentrations in selected solvents are fluid and stable at room temperature.

Low melting tetrafluoroethylene copolymer and its uses

Disclosed herein are novel amorphous tetrafluoroethylene/hexafluoropropylene (TFE/HFP) copolymers, which are more random than previous amorphous TFE/HFP copolymers, as well as a novel high productivity continuous process for making these polymers. The polymers are particularly useful in the form of coatings, films and encapsulants.

Amorphous tetrafluoroethylene/hexafluoropropylene copolymers

Low-melting tetrafluoroethylene copolymer and its uses

Fluoroelastomers and fluoroplastics are plasticized with high-boiling fluorinated aliphatic cyclic structures to enhance processibility or to improve final properties.

Plasticized fluoropolymers

Low-melting tetrafluorethylene copolymer and its uses

Extruded shaped structures of amorphous polyarylate copolymers, having a tensile elongation at break of at least 80% at 25.degree. C., are made by drawing a molten extrudate of the copolymer at a temperature at least 100.degree. C. above the glass transition temperature of the copolymer.

Preparing shaped structure of polyarylate copolymers having high tensile

The subject invention provides a composition having excellent extrusion characteristics comprising a difficulty-melt-processible polymer and 0.002-0.5 wt. % of one or more fluoropolymer process aids wherein the fluoropolymer has a fluorine to carbon ratio of at least 1:2, is capable of forming a die-coating film under the prevailing conditions of extrusion temperature and pressure, and contains an effective amount of polar functional polymer chain end groups, --W, wherein --W is selected from --COF, --SO.sub.2 F, --SO.sub.3 M, --OSO.sub.3 M, --COOR, and --COOM, wherein R is C.sub.1-3 alkyl and M is hydrogen, a metal cation, preferably an alkali or alkaline earth metal cation, or a quaternary ammonium cation.

Fluoropolymer process aids containing functional groups

Shaped structure of polyarylate copolymers having high tensile

Polymer blend composition having improved processibility and comprising:

Processing aid for polymers

A melt-processable thermoplastic composition consisting essentially of a blend of a melt processable thermoplastic fluorocarbon polymer and about 0.05 to about 0.5 percent by weight of an elastomeric copolymer of tetrafluoroethylene and a perfluoro(alkyl vinyl ether) exhibits improved processing properties.

Melt processable TFE copolymers with improved processability

A low smoke and flame-resistant fluoropolymer composition, useful as insulation in a plenum cable and comprised of a base polymer of ethylene units, tetrafluoroethylene and/or chlorotrifluoroethylene units, and fluorine-containing, non-telogenic termonomer units; a metal oxide; and a polytetrafluoroethylene drip suppressant.

Low smoke and flame-resistant composition

Growing community of inventors

Newark, DE, United States of America

Charles W Stewart, Sr