High solids precipitated calcium carbonate with cationic additive

A process for producing an aqueous suspension of precipitated calcium carbonate comprising the steps of:

• i) providing a calcium oxide containing material, the calcium oxide containing material having a minimum calcium oxide content of at least 75 wt.-%, based on the total weight of the calcium oxide containing material,
• ii) providing at least one cationic polymer comprising monomer units, the at least one cationic polymer being a quaternized ammonium compound which consists of monomer units, the monomer units each being a quaternized ammonium compound,
• iii) preparing a milk of lime by mixing water, the calcium oxide containing material of step i), and the at least one cationic polymer of step ii) to obtain a milk of lime, wherein the calcium oxide containing material and the water are mixed in a weight ratio from 1:1 to 1:5, and wherein the at least one cationic polymer is present in an amount from 0.01 to 0.5 wt.-%, based on the total weight of the calcium oxide containing material, and
• iv) carbonating the milk of lime obtained in step iii) to form an aqueous suspension of precipitated calcium carbonate.