Process for preparing modified poly-(2,6-dimethyl-p-oxyphenylene)
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United States of America Patent
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Dec 8, 1992
Grant Date -
N/A
app pub date -
Dec 6, 1990
filing date -
Dec 12, 1989
priority date (Note) -
Expired
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Abstract
A process for preparing a modified, amorphous poly-(2,6-dimethyl-p-oxyphenylene) (PPO) comprises: (a) metalating PPO with a metalating agent, and (b) functionalizing such a metalated PPO by reacting the PPO with a trialkylsilyl halide and/or ethylene oxide; and is characterized in that the reaction of metalation is carried out in an inert liquid vehicle which contains PPO in an at least partially suspended solid form, by operating under metalating conditions of gradually adding metalating agent to such a suspension, either continuously or as discrete portions. Depending on the functionalizing agents used, and on the sequence of addition thereof, the process makes it possible to obtain PPO polymers which are modified with trialkyl-silyl, hydroxyethylene and/or ethyleneoxytrialkyl-silyl functional groups. The modified PPO polymers are particularly suitable for preparing flat membranes, including asymmetrical membranes, for the separation of gas mixtures.
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