Patent ID: 7601785

Claim:
A sulfonated multiblock copolymer, which comprises a hydrophilic block (X) having a repeating unit represented by the following formula 1a, and a hydrophobic block (Y) having a repeating unit represented by the following formula 2, wherein number (m) of the repeating unit of formula 1a in the hydrophilic block (X) and number (n) of the repeating unit of formula 2 in the hydrophobic block (Y) satisfy the conditions of 4≦m≦400 and 4≦n≦400: Ar 1 —O—Ar 2a —O [Formula 1a] Ar 1 —O—Ar 3 —O [Formula 2] wherein Ar 1 is a bonding unit represented by the following formula 3; Ar 2a is a bonding unit represented by the following formula 4a; and Ar 3 is a bonding unit represented by the following formula 5; wherein A is a direct bond, —O—, —S—, —CO—, —SO 2 —, —C(CH 3 ) 2 —, or —C(CF 3 ) 2 —; and each of R 1 to R 8 independently represents a hydrogen atom, C1˜C6 alkyl group, C2˜C6 alkenyl group, C2˜C6 alkynyl group, nitro group, chlorine, bromine, oxo or a hydroxy group; wherein each of x and x′ independently represents a number satisfying the conditions of 0≦x≦1 and 0≦x′≦1, with the proviso that 0<x+x′≦2; and each of R 9 to R 22 independently represents a hydrogen atom, C1˜C6 alkyl group, C2˜C6 alkenyl group, C2˜C6 alkynyl group, nitro group, chlorine, bromine, oxo or a hydroxy group; and wherein B is a direct bond, —O—, —S—, —CO—, —SO 2 —, —C(CH 3 ) 2 —, or —C(CF 3 ) 2 —; and each of R 23 to R 30 independently represents a hydrogen atom, C1˜C6 alkyl group, C2˜C6 alkenyl group, C2˜C6 alkynyl group, nitro group, chlorine, bromine, oxo or a hydroxy group.