Patent ID: 7157548
Filing Date: 2007-01-02
Classification: C08G

Abstract:
1. A sulfonated polyimide comprising the repeating units of Formula 2, wherein A i) a tetravalent aromatic radical which includes at least one aromatic carbon ring having 6 to 10 carbon atoms and is substituted by one or more substituents chosen from among alkyl groups and alkoxy groups having 1 to 10 carbon atoms and halogen atoms, or ii) a tetravalent aromatic radical which includes at least one aromatic carbon ring having 5 to 10 atoms including one or more heteroatoms chosen from among S, N and O and is substituted by one or more substituents chosen from among alkyl groups and alkoxy groups having 1 to 10 carbon atoms and halogen atoms; Ar Ar i) a divalent aromatic radical which includes at least one aromatic carbon ring having 6 to 10 carbon atoms and is substituted by one or more substituents chosen from among alkyl groups and alkoxy groups having 1 to 10 carbon atoms and halogen atoms, or ii) a divalent aromatic radical which includes at least one aromatic carbon ring having 5 to 10 atoms including one or more heteroatoms chosen from among S, N and O and is substituted by one or more substituents chosen from alkyl groups and alkoxy groups having 1 to 10 carbon atoms and halogen atoms; B represents a divalent aliphatic radical with a N atom having a —SO.sub.3H group and two or more groups chosen from among —O— group and —CO— group; and the repeating number x represents a whole number from 2 to 20 and the repeating number y represents a whole number from 2 to 30.