Hollow fibres of modified poly-(2,6-dimethyl-p-oxy-phenylene)
AssigneeEniricerche S.p.A.
InventorsAlessandro Stopponi, Claudio Demofonti, Claudio Valentini, Raffaello Sisto, Ugo Pedretti
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Abstract
A hollow fiber of amorphous, hydroxy-ethylated poly-(2,6-dimethyl-p-oxyphenylene) (PPO-OH) with a glass transition temperature (Tg) of from 180.degree. to 200.degree. C. is disclosed, which is formed by a high-density, microporous layer on a macroporous backing, and having an outer diameter comprised within the range of from 450 to 550 .mu.m and an inner diameter comprised within the range of from 250 to 400 .mu.m. The process for preparing the hollow fibre and the use of said fibre in the processes of separation of gas mixtures are disclosed as well.
Claims3
The hollow fibre of amorphous, hydroxyethylated poly-(2,6-dimethyl-p-oxyphenylene) (PPO--OH) with glass transition temperatures (Tg) of from 180.degree. to 200.degree. C., containing in its macromolecule the following units:
- ##STR2## wherein the monomeric units are randomly distributed along the macromolecular chain, and wherein, per each 100 total units (x+y+z+w=100), the x units are comprised within the range of from 30 to 40, the y units are comprised within the range of from 10 to 20, the z units are comprised within the range of from 30 to 60, the w units are comprised within the range of from 0 to 10;
- with the fibre furthermore consisting of a thin, dense, layer on a macroporous backing, and having an outer diameter comprised within the range of from 450 to 550 .mu.m;
- and an inner diameter comprised within the range of from 250 to 400 .mu.m.
Dependencies are inferred from the claim text.