Polymer membranes on the basis of polyvinylidene fluoride, a process for the production thereof and their use

Patent 5151193 Issued on September 29, 1992. Estimated Expiration Date:

November 2, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Hydrophilic PVDF semipermeable membrane
Patent #: 4810384
Issued on: 03/07/1989
Inventor: Fabre

Stable membranes from sulfonated polyarylethers Patent #: 4990252
Issued on: 02/05/1991
Inventor: Tomaschke, et al.

Inventors

Assignee

Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

Application

No. 613861 filed on 11/02/1990

US Classes:

210/651, Removing specified material210/490, Integral or coated layers210/500.41, Sulfone210/500.42, Vinyl264/41PORE FORMING IN SITU (E.G., FOAMING, ETC.)

Examiners

Primary: Spear, Frank

Attorney, Agent or Firm

Ostrolenk, Faber, Gerb & Soffen

International Class

B01D 069/00

Foreign Application Priority Data

1989-02-15 DE

Abstract

The present invention relates to polymer membranes on the basis of polyviidene fluoride (PVDF), a process for the production thereof and their use for ultrafiltration. The membranes are produced according to known techniques from homogeneous solutions containing 5 to 30% by weight of PVDF and 0.01 to 30% by weight of sulfonic acids and/or their salts, obtainable by sulfonation of the polyetheretherketones of formula (I) and/or subsequent neutralization of the sulfonic acids. The membranes are then treated with methanolic solutions containing 0.1 to 5% by weight of the above-mentioned sulfonic acids and/or their salts. This process supplies membranes having excellent hydrophilic properties, high thermal and mechanical stabilities and high trans-membrane flows.--(--O--p--C6 H4 --O--p--C6 H4 --CO--p--C6 H4 --)n -- (I)