Fillers, with the exception of layered silicates, which have a surface coating, wherein this surface coating comprises a water-soluble polyamide or a plurality of water-soluble polyamides, characterized in that at least one of these water-soluble polyamides is produced by polycondensation from the following monomer components: (a) at least one linear-aliphatic, branched-aliphatic, cycloaliphatic, and/or aromatic dicarboxylic acid having 6 to 36 C atoms, preferably having 6 to 18 C atoms, particularly preferably having 6 to 12 C atoms; and 25-100 mol.% in relation to the total of the molar quantities of the monomer components + + of at least one diamine selected from the group consisting of 4-oxaheptane-1,7-diamine, 4,7-dioxadecane-1,10-diamine, 4,7-dioxa-5-methyl-decane-1,10-diamine, 6-oxa-undecane-1,11-diamine, 4,8-dioxa-undecane-1,11-diamine, 4,8-dioxa-5-methyl-undecane-1,11-diamine, 4,8-dioxa-5,6-dimethylundecane-1,11-diamine, 4,9-dioxa-dodecane-1,12-diamine, 4,7,10-trioxa-tridecane-1,13-diamine, 4,7,10-trioxa-5,8-dimethyl-tridecane-1,13-diamine, 4,11-dioxa-tetradecane-1,14-diamine, 4,7,11-trioxa-tetradecane-1,14-diamine, 4,7,10,13-tetraoxa-hexadecane-1,16-diamine, 4,7,10,13,16-pentaoxa-nonadecane-1,19-diamine and 4,17-dioxa-eicosane-1,20-diamine; and 0-50 mol.% in relation to the total of the molar quantities of the monomer components + + of at least one linear-aliphatic, branched-aliphatic, cycloaliphatic, and/or aromatic diamine having 2 to 36, preferably 4 to 18, particularly preferably 6 to 15 C atoms; and 0-50 mol.% in relation to the total of the molar quantities of the monomer components + + of at least one compound from the group consisting of oligooxyethylene diamines, polyoxyalkylene diamines, and polyalkylene glycols; and (c) 0-45 mol.% of at least one lactam and/or at least one amino carboxylic acid; wherein the molar quantity of the monomer component (a) in relation to the total of the molar quantities of the monomer components + + has a molar ratio in the range of 0.8 to 1.2, and wherein the fraction of the monomer component (c) relates to the molar total of all monomer components (a)+ + + +(c) forming the at least one water-soluble polyamide. (a) at least one linear-aliphatic, branched-aliphatic, cycloaliphatic, and/or aromatic dicarboxylic acid having 6 to 36 C atoms, preferably having 6 to 18 C atoms, particularly preferably having 6 to 12 C atoms; and 25-100 mol.% in relation to the total of the molar quantities of the monomer components + + of at least one diamine selected from the group consisting of 4-oxaheptane-1,7-diamine, 4,7-dioxadecane-1,10-diamine, 4,7-dioxa-5-methyl-decane-1,10-diamine, 6-oxa-undecane-1,11-diamine, 4,8-dioxa-undecane-1,11-diamine, 4,8-dioxa-5-methyl-undecane-1,11-diamine, 4,8-dioxa-5,6-dimethylundecane-1,11-diamine, 4,9-dioxa-dodecane-1,12-diamine, 4,7,10-trioxa-tridecane-1,13-diamine, 4,7,10-trioxa-5,8-dimethyl-tridecane-1,13-diamine, 4,11-dioxa-tetradecane-1,14-diamine, 4,7,11-trioxa-tetradecane-1,14-diamine, 4,7,10,13-tetraoxa-hexadecane-1,16-diamine, 4,7,10,13,16-pentaoxa-nonadecane-1,19-diamine and 4,17-dioxa-eicosane-1,20-diamine; and 0-50 mol.% in relation to the total of the molar quantities of the monomer components + + of at least one linear-aliphatic, branched-aliphatic, cycloaliphatic, and/or aromatic diamine having 2 to 36, preferably 4 to 18, particularly preferably 6 to 15 C atoms; and 0-50 mol.% in relation to the total of the molar quantities of the monomer components + + of at least one compound from the group consisting of oligooxyethylene diamines, polyoxyalkylene diamines, and polyalkylene glycols; and (c) 0-45 mol.% of at least one lactam and/or at least one amino carboxylic acid;