Fluoropolymer resin treatment employing sorbent to reduce fluoropolymer resin discoloration

摘要

A 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 the fluoropolymer from the aqueous medium to obtain fluoropolymer resin. The process comprises contacting the aqueous fluoropolymer dispersion with sorbent.

主权项

1. Process for reducing thermally induced discoloration of fluoropolymer resin, said fluoropolymer resin produced by polymerizing in the presence of hydrocarbon surfactant which causes said thermally induced discoloration and wherein all of the monovalent substituents on the carbon atoms of the hydrocarbon surfactant are hydrogen and wherein said fluoropolymer resin has an initial thermally induced discoloration value (Li) about 20 L units on the CIELAB color scale below the L value of equivalent fluoropolymer resin of commercial quality manufactured using ammonium perfluorooctanoate fluorosurfactant, said process comprising:
polymerizing fluoromonomer in the presence of said hydrocarbon surfactant in an aqueous dispersion medium to form aqueous fluoropolymer dispersion; contacting the aqueous fluoropolymer dispersion with sorbent; and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin.