Isatin copolymers having intrinsic microporosity
AssigneeDow Global Technologies LLC
InventorsRobert E. Hefner, Jr., Brian L. Cramm
Life of this patent
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Abstract
A copolymer including a repeating unit represented by Formula I: wherein: L is a divalent hydrocarbon group comprising from 1 to 12 carbon atoms; and L′ is optional and when present is represented by Formula II: wherein: Y, Y′ and Y″ if present, are independently selected from: a carboxylic acid, sulfonic acid, phosphorous acid and phosphoric acid and their corresponding salt or ester; imino, amide, nitrile, hydrogen, hydroxyl and alkyl comprising from 1 to 6 carbon atoms; and A, A′ and A″ if present, are independently selected from an arylene moiety, with the proviso one or both Y″ and A″ may not be present.
Claims10
A copolymer comprising a repeating unit represented by:
- wherein:
- L is a divalent hydrocarbon group comprising from 1 to 12 carbon atoms;
- and L′ is optional and when present is represented by:
- wherein:
- Y, Y′ and Y″ are independently selected from:
- a carboxylic acid, sulfonic, phosphorous acid and phosphoric acid and their corresponding salt or ester;
- imino, amide, nitrile, hydrogen, hydroxyl and alkyl comprising from 1 to 6 carbon atoms;
- and A, A′ and A″ are independently selected from an arylene moiety, with the proviso one or both Y″ and A″ are optional and may not be present.
Dependencies are inferred from the claim text.