E.i. Dupont De Nemours and Company

Dupont Dow Elastomers Inc.

Donnan E Priester

George R Chapman, Jr

Charles W Stewart, Sr

Robert E Tarney

Rita S McMinn

Richard A Morgan

Lewis E Crenshaw

William Howard Tuminello

Mark Elliot Wagman

Charles Winfield Stewart

William L Phillips

John G Van Alsten

Lee A Gorthey

Processability of non-fluorinated melt-processible polymers is improved by introducing a process aid comprising a fluoroelastomer latex or aqueous fluoropolymer dispersion to the non-fluorinated polymer and extruding the blend.

Process aid for melt processible polymers

Polar-side-group-containing extrusion adjuvants, such as ethylene diamine tetraacetic acid or ionomer, that counteract the deleterious effect of certain additives such as zinc stearate, used in polyolefins on the performance of fluoropolymer processing aids in polyolefins are taught.

Processing aid system for polyolefins

A processing aid system composition containing fluoropolymer processing aid, polar-side-group-containing extrusion adjuvant, and poly(oxyalkylene) polymer enhances extrusion of polyolefins.

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

An extrusion process for difficultly melt processible resins, for example, a difficultly-melt-processible hydrocarbon polymer, having improved processibility and having incorporated therein an elastomeric fluorocarbon copolymer, for example, an amorphous vinylidene fluoride copolymer, and a crystalline vinylidene fluoride polymer.

Process and processing aid for extruding a hydrocarbon polymer

Process of melt extruding through an extrusion die whose surface is coated with one or more metal oxides, M.sub.x O.sub.y, wherein M is a metal selected from the group consisting of Ti, Zr, Cr, Fe, Ni, Pd, Pt, Cu, Ag, Au, Al and Si, and x and y are selected to satisfy the valencies of M, a difficultly-melt-processible polymer containing 0.002-2 parts by weight, based on the weight of the polymer, of at least one melt-processible fluorocarbon polymer processing aid having a fluorine to carbon ratio of at least 1:2 and having metal oxide-reactive sites capable of reacting with or physically associating with the metal oxide of the die surface.

Process for melt extrusion of polymers

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

Polymer blend composition having improved processibility and comprising:

Processing aid for polymers

Improved polymer blend composition having improved processibility and comprising:

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Wilmington, DE, United States of America

Donnan E Priester