公开(公告)号：DE4437424A1

公开(公告)日：1996-04-25

申请号：DE4437424

申请日：1994-10-20

Applicant: HOECHST AG

Inventor： GEIS GERHARD ,  MUELLER HANS-KARL ,  PRAS WERNER DR ,  SCHEUNEMANN UDE DR ,  ZIMMERMANN ANDREAS DR

IPC: C08J3/12 ,  C01B33/14 ,  C01B33/145 ,  C01B33/16 ,  C04B14/06 ,  C04B20/00 ,  C04B30/02 ,  C04B38/08 ,  C08J3/20 ,  C08K3/36 ,  C08L101/00 ,  C09J1/00 ,  C09J11/04 ,  C09K21/00 ,  C09D5/02 ,  C09D5/18 ,  F16L59/00

Abstract: The invention concerns a composition containing 30-95 % by volume aerogel particles and at least one aqueous binder. The aerogel particles are less than 0.5 mm in diameter and are preferably provided with hydrophobic surface groups. The invention also concerns a method of producing said particles and the use thereof.

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.