A process for producing a nonwoven fabric, the process comprising the following steps: a) providing a surface-treated calcium carbonate-containing filler material, the surface-treated calcium carbonate-containing filler material comprising a calcium carbonate-containing filler material and a surface-treatment layer on at least a part of the surface of said calcium carbonate-containing filler material, wherein the surface-treatment layer is formed by contacting the calcium carbonate-containing filler material with a surface treatment agent, wherein the surface treatment agent comprises at least one mono-substituted succinic anhydride and/or mono-substituted succinic acid and/or a salt thereof, wherein the at least one mono-substituted succinic anhydride and/or mono-substituted succinic acid and/or salt thereof consist(s) of succinic anhydride and/or succinic acid and/or salt thereof mono-substituted with a group selected from any linear, branched, aliphatic and cyclic group having a total amount of carbons from C2 to C30 in the substituent; b) providing a first polylactic acid polymer, preferably having a melt flow rate MFR, measured at 210°C / 2.16 kg, in the range of 10 to 40 g/10 min, as measured according to EN ISO 1133:2011; c) providing a second polylactic acid polymer being the same or different from the first polylactic acid polymer and preferably having a melt flow rate MFR, measured at 210°C / 2.16 kg, in the range of 10 to 40 g/10 min, as measured according to EN ISO 1133:2011; d) forming a masterbatch by compounding the surface-treated calcium carbonate-containing filler material of step a) in an amount of from 20 to 80 wt.-%, preferably from 40 wt. % to 60 wt.-%, based on the total weight of the masterbatch, with the first polylactic acid polymer of step b); e) mixing the masterbatch of step d) with the second polylactic acid polymer of step c) to obtain a mixture; f) forming the mixture of step e) into fibers; g) forming a fibrous web from the fibers of step f); and h) forming the non-woven fabric by calendering or hydroentanglement of the fibrous web of step g). a) providing a surface-treated calcium carbonate-containing filler material, the surface-treated calcium carbonate-containing filler material comprising a calcium carbonate-containing filler material and a surface-treatment layer on at least a part of the surface of said calcium carbonate-containing filler material, wherein the surface-treatment layer is formed by contacting the calcium carbonate-containing filler material with a surface treatment agent, wherein the surface treatment agent comprises at least one mono-substituted succinic anhydride and/or mono-substituted succinic acid and/or a salt thereof, wherein the at least one mono-substituted succinic anhydride and/or mono-substituted succinic acid and/or salt thereof consist(s) of succinic anhydride and/or succinic acid and/or salt thereof mono-substituted with a group selected from any linear, branched, aliphatic and cyclic group having a total amount of carbons from C2 to C30 in the substituent; wherein the surface treatment agent comprises at least one mono-substituted succinic anhydride and/or mono-substituted succinic acid and/or a salt thereof, wherein the at least one mono-substituted succinic anhydride and/or mono-substituted succinic acid and/or salt thereof consist(s) of succinic anhydride and/or succinic acid and/or salt thereof mono-substituted with a group selected from any linear, branched, aliphatic and cyclic group having a total amount of carbons from C2 to C30 in the substituent; b) providing a first polylactic acid polymer, preferably having a melt flow rate MFR, measured at 210°C / 2.16 kg, in the range of 10 to 40 g/10 min, as measured according to EN ISO 1133:2011; c) providing a second polylactic acid polymer being the same or different from the first polylactic acid polymer and preferably having a melt flow rate MFR, measured at 210°C / 2.16 kg, in the range of 10 to 40 g/10 min, as measured according to EN ISO 1133:2011; d) forming a masterbatch by compounding the surface-treated calcium carbonate-containing filler material of step a) in an amount of from 20 to 80 wt.-%, preferably from 40 wt. % to 60 wt.-%, based on the total weight of the masterbatch, with the first polylactic acid polymer of step b); e) mixing the masterbatch of step d) with the second polylactic acid polymer of step c) to obtain a mixture; f) forming the mixture of step e) into fibers; g) forming a fibrous web from the fibers of step f); and h) forming the non-woven fabric by calendering or hydroentanglement of the fibrous web of step g).