Patent ID: 7393383
Filing Date: 2008-07-01
Classification: B01D,C08L,Y02C,Y02P

Abstract:
1. A membrane for fluid separation comprising: a) a polyimide polymer, and b) a blend polymer selected from the group consisting of a polyamide polymer, a polyamide-imide polymer, and mixtures thereof, wherein said polyimide polymer comprises a plurality of first repeating units of a formula (I), wherein said formula (I) is: in which R 1 or said formula (I) is a moiety having a composition selected from the group consisting of a formula (A), a formula (B), a formula (C), and mixtures thereof, wherein said formula (A), said formula (B), and said formula (C) are: in which R 4 of said formula (I) is a moiety having a composition selected from the group consisting of a formula (Q), a formula (S), a formula (T), and mixtures thereof, wherein said formula (Q), said formula (S), and said formula (T) are: in which Z of said formula (T) is a moiety having a composition selected from the group consisting of a formula (L), a formula (M), a formula (N), and mixtures thereof, wherein said formula (L), said formula (M), and said formula (N) are: wherein said polyamide polymer comprises a plurality of second repeating units of a formula (II), wherein said formula (II) is: in which R a of said formula (II) is a moiety having a composition selected from the group consisting of a formula (a), a formula (b), a formula (c), a formula (d), a formula (e), a formula (f), a formula (g), and mixtures thereof, wherein said formula (a), said formula (b), said formula (c), said formula (d), said formula (e), said formula (f), and said formula (g) are: in which Z′ of said formula (g) is a moiety having a composition selected from the group consisting of a formula (h), a formula (j), a formula (k), a formula (I), and mixtures thereof, wherein said formula (h), said formula (j), said formula (k), and said formula (I) are: in which X, X 1 , X 2 , and X 3 of said formulas (a), (b), (d), (f), (g), (h), (j), and (I) are moieties selected independently from a group consisting of hydrogen, and an alkyl group having 1 to 6 carbon atoms, and in which Z″ of formula (I) is selected from a group consisting of a formula (m), and a formula (p), wherein said formula (m) and said formula (p) are: in which X of formula (p) is a moiety selected from a group consisting of hydrogen, and an alkyl group having 1 to 6 carbon atoms, and in which R 2 of formula (II) is a moiety selected from a group consisting having a formula (q), a formula (s), and mixtures thereof, wherein said formula (q) and said formula (s) are: wherein said polyamide-imide polymer comprises a plurality of third repeating units, wherein said third repeating units are moieties selected from the group consisting of said formula (I), said formula (II), a formula (III), or mixtures thereof, wherein said formula (III) is: in which R a of formula (III) is a moiety having a composition selected from the group consisting of said formula (a), said formula (b), said formula (c), said formula (d), said formula (e), said formula (f), said formula (g), and mixtures thereof, and R 3 of said formula (III) is a formula (t), wherein said formula (t) is: