Patents Assigned to Nitto Denko K.K. - Justia Patents Search

Patents Assigned to Nitto Denko K.K.

Composite or asymmetric fluorine-containing polyimide membrane, a process for manufacturing the same and a method for the separation and concentration of gas using the same

Patent number: 5178940

Abstract: A composite or asymmetric membrane for separating and concentrating a particular component from a mixture of gases. The asymmetric membrane is of a fluorine-containing aromatic polyimide resin of the 6FDA type. The composite membrane has a thin film of an elastomeric polymer formed on a supporting film of a fluorine-containing aromatic polyimide resin of the 6FDA type.

Type: Grant

Filed: May 6, 1992

Date of Patent: January 12, 1993

Assignee: Nitto Denko K.K.

Inventors: Kenji Matsumoto, Xu Ping