Modified poly-(2,6-dimethyl-p-oxyphenylene), process for...

Details Modified poly-(2,6-dimethyl-p-oxyphenylene), process for... Modified poly-(2,6-dimethyl-p-oxyphenylene), process for...

C - Chemistry, Metallurgy

08

J

18/24, 402/8

C08J 5/22 (2006.01) B01D 71/52 (2006.01) C08G 65/48 (2006.01) C08J 9/28 (2006.01)

Patent

CA 2031977

CASE 3170 1. "MODIFIED POLY-(2,6-DIMETHYL-P-OXYPHENYLENE), PROCESS FOR PREPARING IT AND ITS USE IN MEMBRANES FOR SEPARATING GAS MIXTURES" Abstract A modified, amorphous poly-(2,6-dimethyl-p- oxyphenylene) (PPO) having a glass transition temperature (Tg) comprised within the range of temperatures of from 170 to 220° C, contains in its macromolecule: * units functionalized with ethyleneoxy-trialkyl-silyl moieties Image (A) * units functionalized with trialkyl-silyl moieties [-Si(R'R''R''')]: 2. Image Image (B) * units functionalized with hydroxy-ethylene moeties (-CH2-CH2-OH): Image Image (C) * together with unaltered 2,6-dimethyl-p-oxymethylene units: Image Such a modified PPO is prepared by metallating PPO with a metallating agent and causing such a metallated PPO to react with ethylene oxide and a trialkyl-silyl- halide in the stated sequence. The use of modified PPO for the preparation of flat, also asymmetrical, membranes, useful in the processes of separation of gas mixtures, is disclosed.

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