Patent ID: 8211588

Claim:
A sulfonated poly(arylene sulfone) comprising a first repeating unit represented by Formula 1A below, a second repeating unit represented by Formula 1B below, a third repeating unit represented by Formula 1C below, and a fourth repeating unit represented by Formula 1D below: where R 1 s are the same as or different from each other, and are a C1-C10 alkyl group, a C2-C10 alkenyl group, a phenyl group, or a nitro group, p is an integer in the range of 0 to 4, R 2 is hydrogen, a methyl group or an ethyl group, R 3 is a C2-C10 alkenyl group, M is Na, K, or H, and k is in the range of about 0.1 to about 0.9 mole, m is in the range of about 0.1 to about 0.9 mole, and the sum of n and o is in the range of about 0.1 to about 0.5 mole.