Porous membranes made up of organopolysiloxane copolymers

Patent metadata

Field	Value
Publication number	US-9475010-B2
Application number	US-200913057216-A
Country	US
Kind code	B2
Filing date	Aug 13, 2009
Priority date	Aug 22, 2008
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

The object of the invention is porous membranes (M) comprising organopolysiloxane/polyurea/polyurethane/polyamide/polyoxalyl diamine copolymers of the general formula (1), where R, X, Y, D, E, F, B, B′, m, n, a, b, c and d have the meanings indicated in claim 1 , with the proviso that at least 10% of the R H groups present in structural elements E, F and bound to nitrogen indicate hydrogen, and a method for the production of the membranes (M) and use thereof for separating material mixtures.

First claim

The invention claimed is:

1. Porous membranes (M) consisting of organopolysiloxane/polyurea copolymers of the general formula (1):

where the structural element E has the general formulae (2a)

where the structural element F is selected from the general formulae (3a-f)

where
R is a monovalent, optionally fluorine- or chlorine-substituted hydrocarbon radical having 1 to 20 carbon atoms,
R H is hydrogen or a monovalent, optionally fluorine- or chlorine-substituted hydrocarbon radical having 1 to 22 carbon atoms,
X is an alkylene radical having 1 to 20 carbon atoms, in which nonadjacent methylene units may be replaced by groups —O—, or is an arylene radical having 6 to 22 carbon atoms,
Y is a divalent, optionally fluorine- or chlorine-substituted hydrocarbon radical having 1 to 20 carbon atoms,
D is an optionally fluorine-, chlorine-, C 1 -C 6 -alkyl- or C 1 -C 6 -alkyl ester-substituted alkylene radical having 1 to 700 carbon atoms, in which nonadjacent methylene units may be replaced by groups —O—, —COO—, —OCO— or —OCOO—, or is an arylene radical having 6 to 22 carbon atoms,
B and B′ are each a reactive or nonreactive end group which is bonded covalently to the polymer,
m is an integer from 1 to 4000,
n is an integer from 1 to 4000,
a is an integer of at least 1,
b is an integer from 0 to 40,
c is an integer from 0 to 30, and
d is an integer greater than 0,
with the proviso that at least 10% of the radials R H are hydrogen,

wherein said membranes have an asymmetrical construction comprising: (a) a separation selective outer layer comprising the copolymers; and (b) a porous understructure comprising the copolymers, such that the membranes are sufficiently porous so as to separate mixtures.

2. The porous membranes (M) as claimed in claim 1 , wherein R denotes a monovalent unsubstituted hydrocarbon radical having 1 to 6 carbon atoms.

3. The porous membranes (M) as claimed in claim 1 , wherein a denotes a number of not more than 50.

4. The porous membranes (M) as claimed in claim 1 , wherein n denotes a number from 15 to 400.

5. A process for preparing the porous membranes (M) as claimed in claim 1 , from organopolysiloxane/polyurea copolymers of the above general formula (1), by a phase inversion process, wherein, from a solution of organopolysiloxane/polyurea copolymers solvent (L), a film is produced and the solvent (L)-comprising film is contacted with a precipitating medium (F).

6. The process as claimed in claim 5 , wherein solvent (L) and precipitating medium (F) are removed from the solvent (L)-comprising film by evaporation.

7. The process as claimed in claim 5 , wherein the solvent (L)-comprising polymer film is immersed into a precipitation bath filled with precipitating medium (F).

8. The process as claimed in claim 5 , wherein the solvent (L) or a solvent mixture (L) which was used for preparing the solution dissolves in the precipitating medium (F).

9. A method for separating a mixture, said method comprising using the porous membranes (M) as claimed in claim 1 to separate the mixture.

Assignees

• Hoelzl Manfred
• Kirschbaum Frauke
• Wacker Chemie Ag

Inventors

• Hoelzl Manfred
• Kirschbaum Frauke

Classifications

• B01D71/54

  Polyureas; Polyurethanes · CPC title

• B01D71/56 Primary

  Polyamides, e.g. polyester-amides · CPC title

• B01D71/70

  Polymers having silicon in the main chain, with or without sulfur, nitrogen, oxygen or carbon only · CPC title

• B01D69/12

  Composite membranes; Ultra-thin membranes · CPC title

• B01D69/02

  characterised by their properties · CPC title