Liquid purification or separation – Filter – Material
Patent
1986-03-17
1988-04-05
Spear, Frank
Liquid purification or separation
Filter
Material
264 41, B01D 1300
Patent
active
047357215
ABSTRACT:
The present invention is directed to a process for the preparation of a segmented, aliphatic-aromatic polyether-copolycarbonate containing structural units conforming to ##STR1## wherein --D-- is a diphenolate radical and units conforming to ##STR2## wherein --O--Polyether--O-- is an aliphatic polyether-diolate radical, by the phase boundary process in which aliphatic polyether diol and a mixture of dihydroxy compounds are reacted with a carbonic acid halide which is employed in molar excess in relation to the dihydroxy compounds and in which the aqueous phase is kept at a pH value of at least 13 and where the polycondensation reaction is carried out in a reactor by addition of an amine catalyst.
The invention is further directed to the polyether polycarbonate which is obtained by the process and to the preparation of membranes from said polyether copolycarbonate.
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Dhein Rolf
Lange Ralf
Schreckenberg Manfred
Waldenrath Werner
Bayer Aktiengesellschaft
Gil Joseph C.
Harsh Gene
Preis Aron
Spear Frank
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