Multi-block polymer comprising a first prepolymer, made by combining epoxy with diamine, chain extended with a compatible second prepolymer, the membrane made therefrom and its use in separations

摘要

The present invention is directed to a multi-block polymeric material comprising a first prepolymer, made by combining epoxy with diamine, chain extended with a second, different compatible prepolymer selected from the group of prepolymers comprising (a) and (A) diisocyanate combined with a monomer selected from (B) epoxy, polyester, dianhydride or its corresponding tetraacid or diacid-diester, and diamaine in an A/B mole ratio ranging from about 2.0 to 1.05, (b) an (A) polyester combined with (B) epoxy, in an A/B mole ratio ranging from a bout 2.0 to 1.05, (c) an (A) dianhydride or its corresponding tetraacid or diacid-diester combined with one mole of a monomer selected from (B) epoxy, diisocyanate, polyester, and diamine in an A/B mole ratio ranging from about 2.0 to 1. 05, and (d) an (A) diamine combined with a monomer selected from (B) diisocyanate and dianhydride or its corresponding tetraacid or diacid- diester in an A/B mole ratio ranging from about 2.0 to 1.05, and mixtures thereof.