Keil & Weinkauf
Vinyl polymer membranes
 A membrane of a vinyl polymer which contains groups of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each hydrogen, methyl, methoxy, fluorine or trifluoromethyl and R.sup.5 is --CH.sub.2 --CH.sub.2 -- or ##STR2## covalently bonded to the polymer chain, and the use of the said membrane. 
BASF Aktiengesellschaft
B Y Y C H C B
B01D Y10T Y02E C01B H01M C01B B01D
inventional additional additional inventional inventional additional additional
Axel Hans-Josef Peter
Sanner Sterzel Neumann