Patent ID: 6610789
Filing Date: 2003-08-26
Classification: C08F,C08L,H01M,Y02E

Abstract:
A block copolymer comprising the following segments Câ€² and the following segments D and having a number-average molecular weight of from 5Ã—103 to 5Ã—106:Segments Câ€²: segments made of a copolymer comprising repeating units based on a perfluorovinyl ether having a â€”SO2X group, wherein X is a fluorine atom, a chlorine atom or OM wherein M is a hydrogen atom, an alkali metal atom or NR1R2R3R4, wherein each of R1, R2, R3 and R4 which are independent of one another, is a hydrogen atom or a monovalent organic group, and repeating units based on tetrafluoroethylene, wherein the repeating units based on the perfluorovinyl ether are contained in an amount of at least 20 mol %; and Segments D: segments made of an amorphous perfluoropolymer having no ion exchange groups and having alicyclic structures in its main chain.