Patent · US Expired

Emulsifier free aqueous emulsion polymerization process for making fluoropolymers

US7074862B2 · kind B2 · utility

29Cited by

40References

19Claims

0Family size

Assignee

3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

Harald Kaspar · Altötting, DE
Klaus Hintzer · Woodbury, US
Greta Dewitte · Beveren, BE
Werner Schwertfeger · Altötting, DE

Key dates

Filing date	Apr 30, 2002
Grant date	Jul 11, 2006
Priority date	—
Expiry date	Apr 30, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F14/26
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Emulsifier free fluoropolymer manufacturing method in which (a) a chain transfer agent, or a mixture of chain transfer agents are used wherein the chain transfer agents do not yield more than 0.4 weight % relative to the monomer feed of water soluble fluorinated compounds, or (b) a chain transfer agent or a mixture of chain transfer agents selected from alkanes, dialkyl ethers, hydrofluoroethers and/or hydrofluorocarbons.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.