The Chemours Company Fc, LLC

E.i. Dupont De Nemours and Company

Koninklijke Philips Corporation N.v.

Dipti Dilip Khasnis

Paul Douglas Brothers

Peter Arnold Morken

Subhash Vishnu Gangal

Ronald Earl Uschold

Stephen James Getty

Gerard Cnossen

Phan Linh Tang

Gregory Allen Chapman

Marcel Rene Boehmer

Vincent Franco

Adam Paul Smith

Alexander Anthony Marchione

Subash Vishnu Gangal

Maria Suriaatmaja

Luc Gpj D'Haenens

Walter André Jules Stoks

Benjamin Weaver Messmore

Steven Furyk

Michael Deemer

Andrii Matsnev

Cameron Parrish

Xiaolin Liu

Edward Patrick Carey

Walter A J Stoks

Luc G P J D'HAENENS

A process is provided for the polymerization of fluoromonomer to an dispersion of fluoropolymer particles in an aqueous medium in a polymerization reactor, by (a) providing the aqueous medium in the reactor, (b) adding the fluoromonomer to the reactor, (c) adding initiator to the aqueous medium, the combination of steps (b) and (c) being carried out essentially free of hydrocarbon-containing surfactant and resulting in the kickoff of the polymerization of the fluoromonomer, and (d) metering hydrocarbon-containing surfactant into the aqueous medium after the kickoff of polymerization, e.g. after the concentration of the fluoropolymer in the aqueous medium is at least 0.6 wt %, the metering being at a rate reducing the telogenic activity of said surfactant while maintaining surface activity.

Aqueous polymerization of perfluoromonomer using hydrocarbon surfactant

Process for polymerizing fluoromonomer to form an aqueous dispersion of fluoropolymer particles including: (a) providing an aqueous medium in a polymerization reactor, (b) adding nucleating additive comprising polyalkylene oxide having a number average molecular weight of about 50 to about 2000 to the aqueous medium in an amount of about 0.1 ppm to about 50 ppm based on water in the aqueous medium, (c) exposing the nucleating additive to oxidizing agent to form a dispersion of oleophilic nucleation sites in the aqueous medium; (d) pressurizing the reactor by adding fluoromonomer, and (e) adding polymerization initiator to the aqueous medium to cause the polymerizing of the fluoromonomer to form fluoropolymer particles dispersed in the aqueous medium.

Employing polyalkylene oxides for nucleation in aqueous polymerization of fluoromonomer

A process is provided for polymerizing fluoromonomer in an aqueous medium, wherein a dispersion of essentially surfactant-free hydrocarbon-containing oleophilic nucleation sites is first formed in the aqueous medium, and then polymerization is commenced to form a dispersion of fluoropolymer particles at the oleophilic nucleation sites, wherein the nucleation sites can be derived from hydrocarbon-containing compound. The surfactant used to stabilize the fluoropolymer dispersion can also be hydrocarbon-containing.

Nucleation in aqueous polymerization of fluoromonomer

A polymerization process is provided, comprising polymerizing fluoromonomer in an aqueous medium to form a dispersion of fluoropolymer particles in the aqueous medium, said polymerizing being carried out in the presence of (i) polymerization initiator, and (ii) hydrocarbon-containing surfactant stabilizing the dispersion of fluoropolymer particles, the hydrocarbon-containing surfactant being passivated to reduce its the telogenic behavior.

Reducing the telogenic behavior of hydrocarbon-containing surfactants in aqueous dispersion fluoromonomer polymerization

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

A sol-gel coating composition comprising fluoropolymer particles is disclosed. The fluoropolymer particles are distributed homogeneously in the coating, leading to scratch-resistant anti-stick and low-friction coatings that are suitable, for example, for electrical and non-electrical domestic appliances.

Fluoropolymer-containing sol-gel coating

Growing community of inventors

Wilmington, DE, United States of America

Dipti Dilip Khasnis