Patent · US Expired

Process of using a semi-permeable membrane of acrylonitrile copolymers

US4252652A · kind A · utility

24Cited by

5References

1Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Klaus Elfert · Krefeld, DE
Hans J. Rosenkranz · Krefeld, DE
Gerhard D. Wolf · Dormagen, DE
Francis Bentz

Key dates

Filing date	Sep 12, 1979
Grant date	Feb 24, 1981
Priority date	—
Expiry date	Sep 12, 1999

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D71/421
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A disulphimide group-containing acrylonitrile copolymer semi-permeable membrane which comprises: PA0 (A) from 99 to 50% by weight of acrylonitrile units; PA0 (B) from 1 to 50% by weight of units of an acrylonitrile-copolymerizable ethylenically unsaturated monomer containing one or two disulphimide groups; and PA0 (C) from 0 to 30% by weight of units of one or more other acrylonitrile-copolymerizable olefinically unsaturated monomer, the sum of the percentages amounts to 100. The semi-permeable membranes may be used in reverse osmosis and ultrafiltration.

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