Aromatic polysulphones
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United States of America Patent
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-
Dec 2, 1997
Grant Date -
N/A
app pub date -
Oct 15, 1996
filing date -
Dec 2, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An aromatic polyethersulphone incorporating sub-unit (1) where A is an electron withdrawing group, the designation 'o,p' represents that the bond is at the ortho or para position to the A group, and X is selected from: OH; --O M where M is an organic or inorganic cation (other than hydrogen) and n is at least 1; --NR1R2 where R1 and R2 are the same or different and are selected from hydrogen and alkyl, aryl, aminoalkylene or ammonoalkylene groups; and --OR3 where R3 is an alkyl or aryl group; either as the only sub-units of the polymer or in combination with comonomer units. The polymer are useful for the production of membranes for separation processes: ##STR1##
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