Multi-block polymer comprising an oxazolidone prepolymer...

C - Chemistry – Metallurgy – 07 – C

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C07C 15/02 (2006.01) B01D 67/00 (2006.01) B01D 69/10 (2006.01) B01D 71/62 (2006.01) B01D 71/80 (2006.01) C07C 7/144 (2006.01) C08G 18/00 (2006.01) C08G 18/06 (2006.01) C10G 31/11 (2006.01)

Patent

CA 2096437

2096437 9210276 PCTABS00013 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) an (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.

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