Patent ID: 7799893
Filing Date: 2010-09-21
Classification: B01D,C08G,H01M,Y02E,Y02P

Abstract:
1. A polybenzazole block copolymer comprising: at least one block (B1) comprising recurring units R1, more than 50% by moles of said recurring units comprising at least one of a benzimidazole group of formula 1a and a benzimidazole group of formula 1b, and at least one sulfonic acid group of formula 2; wherein E in formula 1a can be a substituted or non-substituted carbon atom or nitrogen atom, and Q in formula 1a and 1b can be a hydrogen atom or a group comprising a sulfonic acid group; and at least one block (B2) comprising recurring units R2, more than 50% by moles of said recurring units comprising at least one selected from the group consisting of a benzoxazole group of formula 3a, a benzoxazole group of formula 3b, a benzothiazole group of formula 4a and a benzothiazole group of formula 4b, wherein E′ and E″ in formula 3a and 4a, respectively, can be independently substituted or non-substituted carbon atom or nitrogen atom, and the block (B2) is substantially free from sulfonic acid groups.