Gas separating material
AssigneeUbe Industries, Ltd.
InventorsHiroshi Makino, Yoshihiro Kusuki, Takashi Harada, Hiroshi Shimazaki
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Abstract
A gas separating material having excellent heat and chemical resistance, mechanical strength and gas-separating function, comprises a gas separating layer consisting of at least one dense film having a thickness of from 0.1 to 20 microns and comprising at least one aromatic imide polymer which comprises at least 80 molar % of at least one type of recurring unit of the formula (I): ##STR1## wherein R represents a divalent aromatic radical.
Claims5
A gas separating material comprising a gas separating layer consisting essentially of at least one dense film having a thickness of from 0.1 to 20 microns, said film comprising at least one aromatic imide polymer having at least 80 molar % of at least one type of recurring unit of the formula:
- ##STR14## wherein R represents a divalent aromatic radical selected from the group consisting of those of the formulae (IV) and (V):
- ##STR15## wherein R.sup.1 and R.sup.2 respectively represent, independently from each other, a member selected from the group consisting of a hydrogen atom, a lower alkyl radical having 1 to 3 carbon atoms and a lower alkoxy radical having 1 to 3 carbon atoms, and A represents a divalent bond selected from the group consisting of --O--, --S--, --CO--, --SO.sub.2 --, --SO--, --CH.sub.2 --, and --C(CH.sub.3).sub.2 --, and ##STR16## wherein R.sup.1 and R.sup.2 are as defined above, said dense film exhibiting a ratio of gas permeability coefficient of hydrogen gas to that of carbon monoxide gas (PH.sub.2 /PCO) of more than 65 and a ratio of gas permeability coefficient of oxygen gas to that of nitrogen gas (PO.sub.2 /PN.sub.2) of from 7.0 to 20.
Dependencies are inferred from the claim text.