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:
Aug. 13, 1991
Filed:
Dec. 06, 1990
Robert C Schucker, Baton Rouge, LA (US);
Exxon Research and Engineering Company, Florham Park, NJ (US);
Abstract
A multi-block polymer comprising an oxazolidone prepolymer chain extended with a second compatible prepolymer, the membrane made therefrom and the use of said membrane in aromatics/non-aromatics separations is disclosed. The multi-block polymer comprises an oxazolidone containing prepolymer chain extended with a second compatible prepolymer, said second prepolymer selected from the group of prepolymers produced by combining (a) and (A) diisocyanate with a monomer selected from (B) polyester dianhydride or corresponding tetraacid or diacid-diester, and diamine in an A/B mole ratio ranging from about 2.0 to 1.05, preferably 2.0 to 1.1; (b) an (A) dianhydride or its corresponding tetraacid or diacid-diester with a monomer selected from (B) epoxy, diisocyanate, polyester and diamine in an A/B mole ratio ranging from about 2.0 to 1.05, preferably about 2.0 to 1.1, or (c) an (A) diamine with a monomer selected from (B) epoxy, diisocyanate, dianhydride, or its corresponding tetraacid or diacid-diester in an A/B mole ratio ranging from about 2.0 to 1.05, preferably about 2.0 to 1.1, and mixtures thereof. The membranes made from these multi-block polymers comprising thin dense films of said polymer deposited on a micro-porous support are also claimed. The membranes are useful for separating aromatic hydrocarbons from mixtures of same with non-aromatic hydrocarbons under perstraction or pervaporation conditions.