Patent · US Expired

Aqueous dispersions of polytetrafluoroethylene having a low amount of fluorinated surfactant

US7294668B2 · kind B2 · utility

5Cited by

81References

9Claims

0Family size

Assignee

3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

Tilman C. Zipplies · Burghausen, DE
Klaus Hintzer · Woodbury, US
Michael C. Dadaias · Eggenfelden, DE
Gernot Loehr · Altötting, DE

Key dates

Filing date	Feb 7, 2006
Grant date	Nov 13, 2007
Priority date	—
Expiry date	Feb 7, 2026

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L71/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

An aqueous non-melt processible polytetrafluoroethylene dispersion having non-melt processible polytetrafluoroethylene particles in an amount of 30 to 70% by weight and an amount of non-ionic surfactant between 2 and 15% by weight based on the weight of polytetrafluoroethylene solids. The dispersion is free of fluorinated surfactant or contains fluorinated surfactant in amounts of not more than 200 ppm based on the amount of polytetrafluoroethylene solids. At least part of the non-melt processible polytetrafluoroethylene particles comprise an effective amount of ionic end groups in the polytetrafluoroethylene polymer chains.

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