A process for the surface-treatment of a calcium carbonate-comprising material, the process comprising the steps of: a) providing an aqueous suspension of at least one calcium carbonate-comprising material having a solids content in the range from 5 to 90 wt.-%, based on the total weight of the aqueous suspension, b) adjusting the pH-value of the aqueous suspension of step a) to a range from 7.5 to 12, c) adding at least one surface-treatment agent to the aqueous suspension obtained in step b) in an amount ranging from 0.05 to 10 mg surface treatment agent per m 2 of the surface area of the at least one calcium carbonate-comprising material as provided in step a), wherein the at least one surface treatment agent is a compound according to Formula (I), wherein R 1 is a hydrolysable alkoxy group, and R 2 , R 3 and R 4 are independently from each other selected from the group consisting of hydrogen, a hydroxyl group, an alkyl group, a vinyl group, an alkoxy group, an acyloxy group, an acryloxy group, a methacryloxy group, an ethacryloxy group, a carboxyl group, an epoxy group, an anhydride group, an ester group, an aldehyde group, an amino group, an ureido group, an azide group, a halogen group, a phosphonate group, a phosphine group, a sulphonate group, a sulphide group or disulphide group, an isocyanate group or masked isocyanate group, a thiol group, a phenyl group, a benzyl group, a styryl group and a benzoyl group, and u, v and w are independently from each other an integer from 0 to 24, d) mixing the aqueous suspension obtained in step c) at a temperature in the range from 30 to 120°C, and e) drying the aqueous suspension during or after step d) at a temperature in the range from 40 to 160°C at ambient or reduced pressure until the moisture content of the obtained surface-treated calcium carbonate-comprising material is in the range from 0.001 to 20 wt.-%, based on the total weight of the surface-treated calcium carbonate-comprising material. a) providing an aqueous suspension of at least one calcium carbonate-comprising material having a solids content in the range from 5 to 90 wt.-%, based on the total weight of the aqueous suspension, b) adjusting the pH-value of the aqueous suspension of step a) to a range from 7.5 to 12, c) adding at least one surface-treatment agent to the aqueous suspension obtained in step b) in an amount ranging from 0.05 to 10 mg surface treatment agent per m 2 of the surface area of the at least one calcium carbonate-comprising material as provided in step a), wherein the at least one surface treatment agent is a compound according to Formula (I), wherein R 1 is a hydrolysable alkoxy group, and R 2 , R 3 and R 4 are independently from each other selected from the group consisting of hydrogen, a hydroxyl group, an alkyl group, a vinyl group, an alkoxy group, an acyloxy group, an acryloxy group, a methacryloxy group, an ethacryloxy group, a carboxyl group, an epoxy group, an anhydride group, an ester group, an aldehyde group, an amino group, an ureido group, an azide group, a halogen group, a phosphonate group, a phosphine group, a sulphonate group, a sulphide group or disulphide group, an isocyanate group or masked isocyanate group, a thiol group, a phenyl group, a benzyl group, a styryl group and a benzoyl group, and u, v and w are independently from each other an integer from 0 to 24, d) mixing the aqueous suspension obtained in step c) at a temperature in the range from 30 to 120°C, and e) drying the aqueous suspension during or after step d) at a temperature in the range from 40 to 160°C at ambient or reduced pressure until the moisture content of the obtained surface-treated calcium carbonate-comprising material is in the range from 0.001 to 20 wt.-%, based on the total weight of the surface-treated calcium carbonate-comprising material. <EOS>