E.i. Dupont De Nemours and Company

Robert E Tarney

Donnan E Priester

Charles W Stewart, Sr

George R Chapman, Jr

Richard A Morgan

Rita S McMinn

Lewis E Crenshaw

William Howard Tuminello

Mark Elliot Wagman

John G Van Alsten

John B Campbell

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

Low-melting tetrafluorethylene copolymer and its uses

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

Improved process for extruding through a die a difficultly-melt-processible polymer, especially a polymer containing an additive such as an antiblock agent. There is first extruded through the die a polymer resin containing 0.001 to 1 wt. % of a copolymer of tetrafluoroethylene and a functional-group-containing monomer that is terminated in a -CF.sub.2 W group wherein W is selected from -SO.sub.2 F, -SO.sub.2 Cl, -SO.sub.3 M, -COOR and -COOM, R is a C.sub.1-3 alkyl radical and M is H, a metal cation or an ammonium or quaternary ammonium cation, and thereafter there is extruded through the die the difficultly-melt-processible polymer admixed with 0.001-1 wt. % of a fluoropolymer process said having a fluorine to carbon ratio of at least 1:2.

Extrusion process for difficultly-melt-processible polymers

Dichlorobutene is treated with aqueous inorganic alkali in the presence of a catalytic amount of a quaternary ammonium compound catalyst to dehydrochlorinate the dichlorobutene and directly form chloroprene.

Dehydrohalogenation of 3,4-dichloro-1-butene

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Hockessin, DE, United States of America

Robert E Tarney