Eniricerche S.p.a.

Agip Petroli

Snam S.p.a.

Amalia Assogna

Arnaldo Roggero

Alberto Gandini

Raffaello Sisto

Claudio Valentini

Alessandro Stopponi

Ugo Pedretti

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.

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

A process for preparing a modified, amorphous poly-(2,6-dimethyl-p-oxyphenylene) (PPO) comprises:

Process for preparing modified poly-(2,6-dimethyl-p-oxyphenylene)

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Amalia Assogna