Multi-block polymer comprising a first amide acid prepolymer, ch

Details Multi-block polymer comprising a first amide acid prepolymer, ch Multi-block polymer comprising a first amide acid prepolymer, ch

1990-12-06

1992-07-14

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

21050027, 21050028, 21050037, B01D 6100

Patent

active

051300176

ABSTRACT:
The present invention is directed to a multi-block polymeric material comprising a first amide acid prepolymer, made by combining (A) a diamine with (B) a 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, chain extended with a second, different, compatible prepolymer selected from the group of prepolymers comprising (A) a dianhydride or its corresponding tetraacid or diacid-diester combined with a monomer selected from (B) epoxy, diisocyanate and polyester in an A/B mole ratio ranging from about 2.0 to 1.05, preferably about 2.0 to 1.1.
The present invention is also directed to membranes of the above recited multi-block polymeric materials, especially membranes comprising thin, dense films of said multi-block polymeric material deposited on a micro porous 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.

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