Polymer compositions including a poly(ether sulfone) blend and articles made therefrom

An article comprising a surface configured to contact a protein, the surface comprising a polymer composition, the polymer composition comprising:

• component (a):
• from about 50 wt. % to about 98.5 wt. % of a poly(ether sulfone), PES polymer (M1);
• component (b):
• from about 1 wt. % to about 40 wt. % of a polysulfone, PSU polymer (M2), or
• from about 1 wt. % to about 40 wt. % of a poly(phenyl ether sulfone), PPSU polymer (M3), or
• from about 1 wt. % to about 40 wt. % of a mixture of the PSU polymer (M2) and the PPSU polymer (M3);
• optionally from about 1 wt. % to about 40 wt. % of at least one clay mineral filler (F) wherein all the wt. % are relative to the total weight of the polymer composition and with the proviso that if the polymer composition comprises from about 1 wt. % to about 7 wt. % of the PPSU polymer (M3), the clay mineral filler (F) is present from at least about 7 wt. % to about 40 wt. %,
• wherein the PES polymer (M1) comprises at least 80 mol. % of recurring units (RPES) of formula (II):
• wherein:
• each Ri, equal to or different from each other, is selected from the group consisting of a halogen, an alkyl, an alkenyl, an alkynyl, an aryl, an ether, a thioether, a carboxylic acid, an ester, an amide, an imide, an alkali or alkaline earth metal sulfonate, an alkyl sulfonate, an alkali or alkaline earth metal phosphonate, an alkyl phosphonate, an amine, and a quaternary ammonium, and
• each i, equal to or different from each other, is an integer ranging from 0 to 4.