Sulphonated polyarylethersulphone copolymers
AssigneeImperial Chemical Industries PLC
InventorJohn B. Rose
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Abstract
A polyarylethersulphone copolymer which is a hydrophilic sulphonated copolymer derived by controllably sulphonating a copolymer having the repeat unit of formula ##STR1## together with the repeat unit B of formula ##STR2## substantially all the units A being sulphonated after sulphonation and substantially all the units B remaining non-sulphonated after sulphonation. The sulphonation is effected using 98% w/w sulphuric acid.
Claims6
A polyarylethersulphone copolymer which is a hydrophilic sulphonated copolymer having 1 to 99 mole % of repeat units based on the repeat unit which, with no sulphonation, has the formula ##STR11## wherein substantially all of said repeat units are sulphonated, the sulphonation present being in the sub-units ##STR12## with monosulphonation thereof in the case of the ether linkages being ortho or para disposed and disulphonation thereof in the case of the ether linkages being meta disposed;
- and 99 to 1 mole % of substantially non-sulphonated repeat units of formula ##STR13##
Dependencies are inferred from the claim text.