Process for the preparation of polyether amide solutions, steam-

Details Process for the preparation of polyether amide solutions, steam- Process for the preparation of polyether amide solutions, steam-

Filed on

1996-12-20

Date issued

1999-01-12

Examiner

Hampton-Hightower, P.

Patent Class

Synthetic resins or natural rubbers -- part of the class 520 ser

SubClass

Synthetic resins

SubSubClass

From carboxylic acid or derivative thereof

Other Related Categories

528322, 528332, 528335, 528336, 528368, 264 41, 264 49, 264204, 264344, 210490, 210492, 21050038, C08G 6926, C08G 7310

Type

Patent

Status

active

Patent number

058591753

Description

ABSTRACT:
Process for the preparation of polyether-amide solutions, steam-sterilizable dialysis membranes obtainable using the polyether-amide solutions, and a process for the production of these membranes.
Polycondensation of one or more dicarboxylic acid derivatives of the formula I ##STR1## with one or more aromatic diamines of the formula II ##STR2## and, if appropriate, m-phenylenediamine, in aprotic polar solvents is known.
As a result of passing ammonia, in an amount sufficient to neutralize the HCl formed, into the polymer solution obtained after the end of the polycondensation and filtering off the ammonium chloride formed, it is possible to prepare neutral, salt-free and particularly storage-stable polyether-amide solutions which can be further processed to membranes without isolation of the polymer. The resulting membranes are steam-sterilizable, chemically and thermally stable and show efficiency data in the region of that of good high-flux dialysis membranes.
Flat and hollow fiber membranes for ultrafiltration.

REFERENCES:
patent: 4900443 (1990-02-01), Wrasidlo
patent: 5152894 (1992-10-01), Haubs et al.
patent: 5562826 (1996-10-01), Schneider et al.
E. Wetzels et al., "Hamodialyse, peritonediaylse, Membranplasmaphorese und verwandt Verfahren", Springer Verlag, 3. Auflage, 1986, list of contents.
Wallhausser, "Praxis der Sterlisation, Desinfektion, Konservierung", 3. Auflage, Thieme Verlag, 1981, list of contents.
"Polyamide -- The evolution of a Synthetic Membrane for Renal Therapy" ed. by S. Shaldon et al., contribution to Nephrology Nr. 96, Karger Verlag, 1992.

Affiliated with

Also associated with

Rating

Process for the preparation of polyether amide solutions, steam- does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the preparation of polyether amide solutions, steam-, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of polyether amide solutions, steam- will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1517370