Polymer composition comprising a) at least 20.0 wt.-%, based on the total weight of the polymer composition, of at least one biodegradable polymer resin, b) from 0.1 to 20.0 wt.-%, based on the total weight of the polymer composition, of at least one polyolefin selected from polyethylene and/or polypropylene, and c) from 5.9 to 60.0 wt.-%, based on the total weight of the polymer composition, of an inorganic filler material dispersed in the at least one polyolefin and the at least one biodegradable polymer resin, wherein the inorganic filler material consists of i) from 1.0 to 50.0 wt.-%, based on the total weight of the inorganic filler material, of at least one acidic inorganic filler material, wherein the at least one acidic inorganic filler material is selected from the group comprising talc, silica, clay and mixtures thereof, and ii) from 50.0 to 99.0 wt.-%, based on the total weight of the inorganic filler material, of at least one alkaline inorganic filler material, wherein the at least one alkaline inorganic filler material is selected from at least one calcium carbonate source, magnesium carbonate, magnesium hydroxide and mixtures thereof, wherein at least 1 % of the accessible surface area of the at least one acidic inorganic filler material and/or the at least one alkaline inorganic filler material is covered by a coating comprising a) at least one aliphatic carboxylic acid having a total amount of carbon atoms from C4 to C24 and/or reaction products thereof, preferably by a coating comprising stearic acid and/or reaction products thereof, and/or b) at least one mono-substituted succinic anhydride consisting of succinic anhydride mono-substituted with a group selected from a linear, branched, aliphatic and cyclic group having a total amount of carbon atoms from C2 to C30 in the substituent and/or reaction products thereof, and/or c) a phosphoric acid ester blend of one or more phosphoric acid mono-ester and/or reaction products thereof and one or more phosphoric acid di-ester and/or reaction products thereof, wherein the accessible surface area is defined as in the description. a) at least 20.0 wt.-%, based on the total weight of the polymer composition, of at least one biodegradable polymer resin, b) from 0.1 to 20.0 wt.-%, based on the total weight of the polymer composition, of at least one polyolefin selected from polyethylene and/or polypropylene, and c) from 5.9 to 60.0 wt.-%, based on the total weight of the polymer composition, of an inorganic filler material dispersed in the at least one polyolefin and the at least one biodegradable polymer resin, wherein the inorganic filler material consists of i) from 1.0 to 50.0 wt.-%, based on the total weight of the inorganic filler material, of at least one acidic inorganic filler material, wherein the at least one acidic inorganic filler material is selected from the group comprising talc, silica, clay and mixtures thereof, and ii) from 50.0 to 99.0 wt.-%, based on the total weight of the inorganic filler material, of at least one alkaline inorganic filler material, wherein the at least one alkaline inorganic filler material is selected from at least one calcium carbonate source, magnesium carbonate, magnesium hydroxide and mixtures thereof, i) from 1.0 to 50.0 wt.-%, based on the total weight of the inorganic filler material, of at least one acidic inorganic filler material, wherein the at least one acidic inorganic filler material is selected from the group comprising talc, silica, clay and mixtures thereof, and ii) from 50.0 to 99.0 wt.-%, based on the total weight of the inorganic filler material, of at least one alkaline inorganic filler material, wherein the at least one alkaline inorganic filler material is selected from at least one calcium carbonate source, magnesium carbonate, magnesium hydroxide and mixtures thereof, a) at least one aliphatic carboxylic acid having a total amount of carbon atoms from C4 to C24 and/or reaction products thereof, preferably by a coating comprising stearic acid and/or reaction products thereof, and/or b) at least one mono-substituted succinic anhydride consisting of succinic anhydride mono-substituted with a group selected from a linear, branched, aliphatic and cyclic group having a total amount of carbon atoms from C2 to C30 in the substituent and/or reaction products thereof, and/or c) a phosphoric acid ester blend of one or more phosphoric acid mono-ester and/or reaction products thereof and one or more phosphoric acid di-ester and/or reaction products thereof,