Compositions containing emulsion polymer with improved surface after storage in hot and humid conditions

comprising A) polymer compositions of 0 to 98 parts by weight based on the sum of A and B, of one or a mixture of several different thermoplastic polymers B and B) 2 to 100 parts by weight, based on the sum of a and B, from B1) at least one graft polymer produced by the process of emulsion polymerization, B2) optionally at least one graft polymer produced in the polymerization process in bulk, in suspension or in solution, B3) optionally at least one (co) polymer of rubber-free vinyl, and C) 0 to 30 parts by weight of at least one polymer additive commercially available, adding the sum of the parts by weight of a and B 100, characterized in that (i) the graft polymer according to component B1 produced by emulsion polymerization procedure was precipitated with at least one alkaline earth metal salt selected from the group of magnesium or calcium in a basic medium (pH> 7), and (ii) the graft polymer according to component B1 produced by process of emulsion polymerization containing conditioned by producing at least a sodium salt and at least one salt alkaline as (i), introducing the metal ions in the molar ratio Na / (Mg + Ca) of at least 0.10 and at most 1.0.