The Chemours Company Fc, LLC

E.i. Dupont De Nemours and Company

Adam Paul Smith

Paul Douglas Brothers

Peter Arnold Morken

Subhash Vishnu Gangal

Jon Lee Howell

Phan Linh Tang

Stephen James Getty

Gregory Allen Chapman

Dipti Dilip Khasnis

Vincent Franco

Alexander Anthony Marchione

Benjamin Weaver Messmore

Xiaolin Liu

Edward Patrick Carey

Steven Furyk

Michael Deemer

Andrii Matsnev

Cameron Parrish

A composition comprising a mixture of fluoropolyether acids or salts having a number average value of about 800 to about 2500 g/mol. The amount of fluoropolyether acids or salt in the mixture having a molecular weight of not more than 500 g/mol is not more than 50 ppm by weight of the total amount of fluoropolyether acids or salts in the mixture. The amount of fluoropolyether acids or salts in the mixture having a molecular weight of 2500 g/mol or greater is not more than 40% by weight of the total amount of fluoropolyether acids or salts in the mixture. Preferably the fluoropolyether acids or salts comprise an anionic group selected from the group consisting of carboxylate, sulfonate, sulfonamide anion and phosphonate. Also disclosed is an aqueous dispersion polymerization process for fluoropolymer manufacture employing polymerization agent comprising the specified mixture of fluoropolyether acids or salts.

Aqueous polymerization of fluorinated monomer using a mixture of fluoropolyether acids or salts

Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating fluoropolymer from said aqueous medium by separating wet fluoropolymer resin from the aqueous medium and drying to produce fluoropolymer resin. The process comprises exposing the wet fluoropolymer resin to an oxygen source during drying.

Drying wet fluoropolymer resin and exposing to oxygen source to reduce discoloration

Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises: heating the fluoropolymer resin to a temperature of about 160&#xb0; C. to about 400&#xb0; C.; and exposing the heated fluoropolymer resin to an oxygen source.

Fluoropolymer resin treatment employing heating and oxygen source to reduce discoloration

Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises exposing the aqueous fluoropolymer dispersion to ultraviolet light in the presence of an oxygen source.

Fluoropolymer dispersion treatment employing ultraviolet light and oxygen source to reduce fluoropolymer resin discoloration

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Adam Paul Smith