E.i. Dupont De Nemours and Company

Other

Engelhard-clal

The Chemours Company Fc, LLC

Charles Joseph Noelke

Kenneth Wayne Leffew

Ralph Birchard Lloyd

Peter Gideon Gelblum

Velliyur Nott Mallikarjuna Rao

Steven Henry Swearingen

William George O'Brien

David William Johnson

Norman Herron

Robert Clayton Wheland

Paul Douglas Brothers

Clay Woodward Jones

Ronald Earl Uschold

Ralph Munson Aten

John James Barnes

David John Van Bramer

Richard D Lanam

David Archer Wells

Michael Gene McClusky

Brian Edward Kipp

Joseph Gerard Biondo

Raymond C Harker

Barry Asher Mahler

Mark B Shiflett

Ralph Newton Miller

William H Manogue

Daniel N Levy

Velliyur Nott Mall Rao

Particles comprising a bulk of fluoropolymer and a nucleus of fluorinated ionomer, dispersions of such particles, articles and coatings made from such particles.

Fluoropolymer particles having a nucleus of fluorinated ionomer

A method for capturing certain fluorinated vinyl monomers from a gaseous mixture using ionic liquids is described. The gaseous mixture is contacted with at least one ionic liquid, whereby at least a portion of the fluorinated vinyl monomer is absorbed by the ionic liquid. The method is useful for reducing emissions of fluorinated vinyl monomers and for increasing the product yields in the manufacture of polymers from these monomers.

Capture of fluorinated vinyl monomers using ionic liquids

A process for making an aqueous dispersion of fluorinated ionomer particles by providing dispersed particulate of fluorinated ionomer in an aqueous polymerization medium and polymerizing at least one fluorinated monomer having an ionic group in the aqueous polymerization medium in the presence of the dispersed particulate of fluorinated ionomer and initiator to form the aqueous dispersion of particles of fluorinated ionomer.

Fluorinated ionomer produced by aqueous polymerization using dispersed particulate of fluorinated ionomer

A process for making an aqueous dispersion of fluorinated ionomer particles by polymerizing in a first polymerization step at least one fluorinated monomer having an ionic group in an aqueous polymerization medium in the presence of initiator, the polymerizing providing dispersed particulate of fluorinated ionomer, polymerizing in a second polymerization step at least one fluorinated monomer having an ionic group in the aqueous polymerization medium in the presence of the dispersed particulate of fluorinated ionomer and initiator to form the aqueous dispersion of particles of fluorinated ionomer, and suspending the first polymerization step prior to beginning the second polymerization step.

Fluorinated ionomer produced by aqueous polymerization using dispersed particulate of fluorinated ionomer produced in situ

A process for making an aqueous dispersion of fluoropolymer particles by providing dispersed particulate of fluorinated ionomer in an aqueous polymerization medium and polymerizing at least one fluorinated monomer in the aqueous polymerization medium in the presence of the dispersed particulate of fluorinated ionomer and initiator to form the aqueous dispersion of particles of fluoropolymer.

Fluoropolymer produced by aqueous polymerization using dispersed particulate of fluorinated ionomer

A process for making an aqueous dispersion of fluoropolymer particles by polymerizing in a first polymerization step at least one fluorinated monomer having an ionic group in an aqueous polymerization medium in the presence of initiator, the polymerizing providing dispersed particulate of fluorinated ionomer, and polymerizing in a second polymerization step at least one fluorinated monomer in the aqueous polymerization medium in the presence of the dispersed particulate of fluorinated ionomer and initiator to form the aqueous dispersion of particles of fluoropolymer.

Fluoropolymer produced by aqueous polymerization using dispersed particulate of fluorinated lonomer produced in situ

A process for reducing the fluorosurfactant content of an aqueous fluoropolymer dispersion by filling a container with fluoropolymer dispersion, inserting into the container a fabric pouch containing a fluorosurfactant sorbent so that the sorbent contacts the fluorosurfactant-containing aqueous fluoropolymer dispersion in the container and retains the fluorosurfactant to reduce fluorosurfactant content of said fluorosurfactant-containing aqueous fluoropolymer dispersion, and removing the fabric pouch from the container.

Process for removing fluorosurfactant from an aqueous fluoropolymer dispersion using sorbent pouches

A process for reducing the fluorosurfactant content of an aqueous fluoropolymer dispersion by filling a shipping container with fluoropolymer dispersion and contacting the dispersion with a fluorosurfactant sorbent in the shipping container.

Removing fluorosurfactant from aqueous fluoropolymer dispersions

A process for reducing the fluorosurfactant content of a stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion by passing dispersion through a first fixed bed of anion exchange resin to reduce fluorosurfactant content. The first fixed bed has a working zone which moves though the column as the ion exchange resin is saturated. The process includes monitoring a property of the dispersion as the dispersion exits the fixed bed to determine break though of the working zone indicating saturation of the fixed bed. The property being monitored is selected from the group consisting of pH and conductivity.

Monitoring column breakthrough in a process for removing fluorosurfactant from aqueous fluoropolymer dispersions

A process for reducing fluorosurfactant content of a stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion comprising passing said stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion through a fixed bed of ion exchange resin beads comprising a polymer and functional groups to reduce fluorosurfactant content, the ion exchange resin beads being monodisperse.

Removing fluorosurfactant from aqueous fluoropolymer dispersions using monodisperse ion exchange resin

A gold-lined pyrolysis reactor is used to pyrolyze compounds to form fluoroolefins like tetrafluoroethylene and hexafluoropropylene in high yield, with minimum to no formation of perfluoroisobutylene, chlorotrifluoroethylene, coke, salts, or polymer.

Synthesis of perfluoroolefins

This invention relates to a process for the synthesis of diacyl peroxide by contacting acyl halide and peroxide complex in compatible aprotic solvent substantially free of compounds oxidizable by the peroxide complex or the reaction products of organic acyl halide with peroxide complex and the initiation of polymerization with diacyl peroxide in the aprotic solvent.

Polymerization employing diacyl peroxide made in aprotic solvent

The present invention relates to the pyrolysis of hydrochlorofluorocarbons to form fluoromonomers such as tetrafluoroethylene, the pyrolysis being carried out in a reaction zone lined with nickel and mechanically supported by a jacket of other corrosion resistant metal, the nickel lining providing an improved yield of valuable reaction products.

Pyrolysis process

A layered article having a curved surface made of a supporting metal metallurgically bonded to a supported metal.

Metallurgically bonded layered article having a curved surface

The present invention relates to the co-pyrolysis of fluoroform and chlorodifluoromethane to form a mixture of useful fluoroolefin and saturated HFCs, notably, tetrafluoroethylene and hexafluoropropylene and CF CHF and CF CHFCF , respectively.

Growing community of inventors

Wilmington, DE, United States of America

Charles Joseph Noelke