Patent · US Active

Composite membranes and methods of preparation thereof

US9022227B2 · kind B2 · utility

11Cited by

29References

6Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Young-Hye Na · San Jose, US
Ratnam Sooriyakumaran · San Jose, US
Ankit Vora · San Jose, US

Key dates

Filing date	Mar 21, 2011
Grant date	May 5, 2015
Priority date	—
Expiry date	Mar 5, 2034

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D2325/48
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A polymeric membrane includes an active layer over a support, wherein the active layer includes at least two chemically distinct polyamide films. A first one of the films is in contact with the support, and a second one of the films is not in contact with the support. The second polyamide film is crosslinked with the first polyamide film at an interface therewith, and the second polyamide film includes a structure having a side chain group including an ammonium salt.

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