Sulphonated polyaryl-ether-sulphones and membranes thereof

Details Sulphonated polyaryl-ether-sulphones and membranes thereof Sulphonated polyaryl-ether-sulphones and membranes thereof

1975-12-23

1977-10-18

Lee, Lester L.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

210 23H, 260 49, 427244, 427245, 427384, 427391, 428218, 428411, C08G 7523

Patent

active

040547078

ABSTRACT:
Novel sulphonated polyaryl-ether-sulphone resins are described which are particularly suitable for producing semi-permeable membranes, in particular for reverse osmosis. These resins consist essentially of a plurality of units of the formula: ##STR1## and, optionally, a plurality of units of the formula: ##STR2## in which A.sub.1, A.sub.2, A.sub.3, A.sub.4 and A.sub.5 each represents a phenylene radical at least one of which is substituted by an optionally salified sulpho (--SO.sub.3 H) radical, the relative proportions of units of formula (I) and (II) and the degree of substitution by sulpho radicals being such that the number of sulpho groups is from about 0.1 to about 5 milliequivalents per gram of dry resin.

REFERENCES:
patent: 3554972 (1971-01-01), Cornell
patent: 3709841 (1973-01-01), Quentin

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