Modified poly(2,6-dimethyl-p-oxyphenylene), a process for its preparation and its use in gas mixture separation membranes
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United States of America Patent
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Dec 15, 1992
Grant Date -
N/A
app pub date -
Jul 10, 1990
filing date -
Jul 11, 1989
priority date (Note) -
Expired
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Abstract
An amorphous modified poly(2,6-dimethyl-p-oxyphenylene) (PPO) is described with a glass transition temperature (Tg) within the range of 170.degree.-220.degree. C., of which the macromolecules contain units having trialkylsilyl groups bonded to the nucleus and/or to the methyl: ##STR1## together with units having hydroxyethyl groups bonded to the nucleus and/or to the methyl: ##STR2## This modified PPO is prepared by metalating PPO with a metalating agent and reacting the formed metalated PPO with a trialkylsilyl halide and with ehtylene oxide in succession. The use of the thus modified PPO for the preparation of flat, including asymmetric, membranes useful in gas mixture separation processes is described.
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