公开(公告)号：DE19516908A1

公开(公告)日：1995-11-16

申请号：DE19516908

申请日：1995-05-09

Applicant: HOECHST AG

Inventor： ALTHOFF OLAF DR ,  FALK UWE DR ,  SCHEUNEMANN UDE DR ,  PRAS WERNER DR ,  HICKEL WERNER DR

IPC: B01D53/22 ,  B01D69/12 ,  B01D71/32 ,  B01D71/36 ,  B01D71/38 ,  B05D1/20 ,  B32B5/18 ,  B32B27/00 ,  B32B27/08 ,  B32B27/16 ,  B32B27/30 ,  B01D67/00 ,  B01D61/36

Abstract: A composite membrane comprises a porous base membrane (A) and a fluorine-contg. perm-selective layer (C) 10-500 nm thick consisting of a copolymer of: (a) 10-80 mole% units of a vinyl ester of formula (I); (b1) 5-40 mole% vinyl alcohol units of formula (II) or (b2) 5-50 mole% units of formula (III); and (c) at least 10 mole% fluoro-olefin, with the OH gp.-contg. chains crosslinked with one another. In the formula, R1-R3 = H, alkyl, cycloalkyl or aryl, with a total of 5-30 C atoms over all 3 gps.; R4 = OH, opt. with up to 10% of the gps. R4 replaced by -OCOR5 (with R5 = Me, Et or Pr); R6 = 1-6C linear or branched alkylene. Also claimed is a process for the prodn. of this membrane, by dissolving the above terpolymer in a solvent, mixing with a polyfunctional isocyanate, spreading the soln. on water, evaporating the solvent and transferring the layer (C) thus obtd. to a base membrane (A). Also claimed is a membrane as described above in which the copolymer in layer (C) is uncrosslinked. Preferably, R1-R3 = alkyl or cycloalkyl with a total of 7-9 C atoms, pref. with at least one of these gps. = Me; R6 = 1,4-butylene.

公开(公告)号：DE4416330A1

公开(公告)日：1995-11-16

申请号：DE4416330

申请日：1994-05-09

Applicant: HOECHST AG

Inventor： SCHEUNEMANN UDE DR ,  ALTHOFF OLAF DR ,  HICKEL WERNER DR ,  APPEL GUNTHER ,  BAUER JACQUELINE ,  GEIS GERHARD

IPC: B01D69/12 ,  B01D71/70 ,  B32B5/18 ,  C08J3/24 ,  C08J5/18 ,  C08L83/02 ,  C08L83/04 ,  B01D67/00 ,  B01D61/36 ,  B01D53/22

Abstract: The prodn. of composite membranes comprises spreading a soln. of a polymer (I) in a volatile solvent on water. Allowing the solvent to evaporate, crosslinking the polymer and transferring the film obtd. to a supporting membrane. Also claimed is a composite membrane with polymer layer(s) on a porous base membrane, obtd. by this process. (I) is a polysiloxane which is pref. crosslinked via OH gps. on the polymer, with the aid of a bi-, tri- or tetra-functional silane with hydrolysable SiO- gps. as crosslinker (II), pref. triacetoxy-methyl-silane (TACMS), in the presence of a catalyst, pref. a tin salt. Alternatively, (I) may be a polymer contg. olefinic double bonds, which is crosslinked by irradiation. Pref. polymer layer is a protective layer of polysiloxane, crosslinked via OH gps. to a structure contg. units of formula Si(O-)4, R-Si(O-)3 or RR Si(O-)2 (with R, R = alkyl, phenyl or vinyl), or a silicone which is crosslinked by irradiation.