The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 2013
Filed:
Sep. 10, 2010
Chunqing Liu, Schaumburg, IL (US);
Raisa Minkov, Skokie, IL (US);
Syed A. Faheem, Huntley, IL (US);
Man-wing Tang, Cerritos, CA (US);
Lubo Zhou, Inverness, IL (US);
Jeffery C. Bricker, Buffalo Grove, IL (US);
Chunqing Liu, Schaumburg, IL (US);
Raisa Minkov, Skokie, IL (US);
Syed A. Faheem, Huntley, IL (US);
Man-Wing Tang, Cerritos, CA (US);
Lubo Zhou, Inverness, IL (US);
Jeffery C. Bricker, Buffalo Grove, IL (US);
UOP LLC, Des Plaines, IL (US);
Abstract
The present invention discloses high performance polybenzoxazole membranes prepared from aromatic poly(o-hydroxy amide) membranes by thermal cyclization and a method for using these membranes. The polybenzoxazole membranes were prepared by thermal treating aromatic poly(o-hydroxy amide) membranes in a temperature range of 200° to 550° C. under inert atmosphere. The aromatic poly(o-hydroxy amide) membranes used for making the polybenzoxazole membranes were prepared from aromatic poly(o-hydroxy amide) polymers comprising pendent phenolic hydroxyl groups ortho to the amide nitrogen in the polymer backbone. In some embodiments of the invention, the polybenzoxazole membranes may be subjected to an additional crosslinking step to increase the selectivity of the membranes. These polybenzoxazole membranes showed significantly improved permeability for gas separations compared to the precursor aromatic poly(o-hydroxy amide) membranes and are not only suitable for a variety of liquid, gas, and vapor separations, but also can be used in catalysis and fuel cells.