Multi-block polymer comprising a urea prepolymer chain extended

Liquid purification or separation – Filter – Material

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502 4, B01D 7154

Patent

active

050985701

ABSTRACT:
The present invention is directed to a multi-block polymeric material comprising a urea prepolymer chain extended with a second compatible prepolymer selected from the group of prepolymers comprising (a) an (A) dianhydride or its corresponding tetraacid or diacid-diester combined 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, and (b) an (A) diamine combined with a monomer selected from (B) epoxy and 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 present invention is also directed to membranes of the above recited multi-block polymeric material, especially membranes comprising them, dense films of said multi-block polymeric material deposited on a microporous support layer producing a thin film composite membrane. The membranes of the multi block polymeric material, especially the thin film composite membranes are useful for separating aromatic hydrocarbons from mixtures of same with non-aromatic hydrocarbons under perstraction or pervaporation conditions.

REFERENCES:
patent: 4914064 (1990-04-01), Schucker

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