Employing pretreatment and fluorination of fluoropolymer resin to reduce discoloration
AssigneeE. I. Du Pont de Nemours and Company
InventorsPaul Douglas Brothers, Gregory Allen Chapman, Subhash Vishnu Gangal
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Abstract
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 the aqueous medium by separating fluoropolymer resin in wet form from the aqueous medium and drying to produce fluoropolymer resin in dry form. The process comprises: pretreating the aqueous fluoropolymer dispersion and/or the fluoropolymer resin in wet or dry form; and exposing the fluoropolymer resin in dry form to fluorine.
Claims14
Process for reducing thermally induced discoloration of fluoropolymer resin, said fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium by separating fluoropolymer resin in wet form from the aqueous medium and drying to produce fluoropolymer resin in dry form, said process comprising:
- pretreating the aqueous fluoropolymer dispersion and/or the fluoropolymer resin in wet or dry form;
- and
- exposing the fluoropolymer resin in dry form to fluorine.
Dependencies are inferred from the claim text.