Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Ion-exchange polymer or process of preparing
Reexamination Certificate
2007-01-09
2007-01-09
Lipman, Bernard (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Ion-exchange polymer or process of preparing
C525S326200, C525S344000, C525S366000
Reexamination Certificate
active
10984031
ABSTRACT:
Methods are provided to make acid functional fluoropolymers by: a) dehydrofluorinating a starting fluoropolymer with a dehydrofluorinating agent to form an unsaturated fluoropolymer; b) adding an acidifiable nucleophilic functionalizing agent to a double bond of the unsaturated fluoropolymer; and c) acidifying the added acidifiable function. Acid functional fluoropolymers and ion conducting membranes thereof are also provided, including acid functional fluoropolymer having pendent groups according to the formula: —X—Ar—An, wherein X is selected from O, S or NR, where R is selected from H and C1–C30 alkyl or aryl, which are optionally substituted, wherein Ar is a C6–C30 aromatic group, which is optionally substituted, wherein A is an acidic function or salt thereof, wherein a can be independently chosen to be 1, 2 or 3.
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Hamrock Steven J.
Hardy L. Charles
Jing Naiyong
Mao Shane S.
3M Innovative Properties Company
Dahl Philip Y.
Lipman Bernard
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