Semipermeable, porous, asymmetric polyether amide membranes

Details Semipermeable, porous, asymmetric polyether amide membranes Semipermeable, porous, asymmetric polyether amide membranes

B - Operations, Transporting

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B01D 69/10 (2006.01) B01D 69/06 (2006.01) B01D 71/52 (2006.01) B01D 71/56 (2006.01) B01D 71/66 (2006.01) C08G 69/26 (2006.01) C08G 69/40 (2006.01) C08G 69/42 (2006.01)

Patent

CA 2081260

Abstract of the disclosure: Semipermeable, porous, asymmetric polyether amide membranes 1. A semipermeable, porous, asymmetric membrane, which contains a polyaramide which contains one or more of the recurring structural units of the formula (I) Image (I) and, based on the sum of (II) and (III), up to 15 to 100 molar % of structural units of the formula (II) Image (II) and, based on the sum of (II) and (III), up to 0 to 85 molar % of structural units of the formula (III) Image (III) where the ratio of the sum of (II) and (III) to (I) is 0.90 to 1.10, and the symbols -Ar-, -X- and -Y- have the following meaning: -Ar- is a divalent, aromatic or heteroaromatic radical, where the two carbonyl groups of the Ar radical are located on unadjacent ring carbon atoms (i.e. in para- or meta-position) and the Ar radical is unsubstituted or substituted by one or two branched or unbranched C1-C3-alkyl or C1-C3-alkoxy radicals, aryl or aryloxy radicals or C1-C6-perfluoroalkyl or C1-C6-perfluoroalkoxy radicals or by fluorine, chlorine, bromine or iodine; -X- is a group -C(CH3)2-, -C(CF3)2-, -CO-, -SO-, -SO2-, -CH2-, -S- or -O- or a direct bond and -Y- is a group -SO2-, Image , -CH2-, -O-, -S- -C(CH3)2-, Image or -C(CF3)2- or a direct bond. The polyaramide has a Staudinger index in the range of 50 to 1090 cm3/g, preferably of 100 to 500 cm3/g. In a preferred instance, the membrane i arranged on a support layer, permeable for flowable media, composed of plastic nonwoven web, for example of polyethylene terephthalate or polypropylene, or is arranged on a fabric.

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