Patent ID: 6844399

Claim:
A surface sulfonated article prepared from a substantially random interpolymer comprising: (1) from 1 to 65 mole percent of polymer units derived from (a) at least one vinyl or vinylidene aromatic monomer, or (b) a combination of at least one vinyl or vinylidene aromatic monomer containing an aromatic ring Ar, and at least one hindered aliphatic or cycloaliphatic vinylidene monomer; and (2) from 35 to 99 mole percent of polymer units derived from at least one aliphatic α-olefin having from 2 to 20 carbon atoms; and (3) from zero to 20 mole percent of polymer units derived from a diene containing from 4 to 20 carbon atoms; and wherein from 0.001 to 30 mole percent of the polymer units contained in said interpolymer contains one or more groups represented by the formula —SO 3 − M where M is hydrogen, NH 4 + or a group 1, 2, 7, 11 or 12 metal.