Process for producing a white UV-absorbing surface-reacted calcium carbonate doped with a titanium species, a white UV-absorbing surface-reacted calcium carbonate and use thereof

A process for producing a white UV-absorbing surface-reacted calcium carbonate doped with a titanium species comprising the steps of:

• a) providing a calcium carbonate-comprising material,
• b) providing a calcium phosphate selected from monocalcium phosphate and/or dicalcium phosphate,
• c) providing at least one titanium comprising substance, and
• d) treating the calcium carbonate-comprising material of step a) with the calcium phosphate of step b) in an aqueous medium to form an aqueous suspension and
• e) grinding the aqueous suspension of step d) at a pH value of at least 4.2 to form an aqueous suspension of a white UV-absorbing surface-reacted calcium carbonate doped with a titanium species,
• wherein the calcium carbonate-comprising material of step a) and the calcium phosphate of step b) in combination have a calcium ion to phosphate ion molar ratio (Ca2+:PO43−) in the range from 1.75:1 to 100:1, and
• wherein the at least one titanium comprising substance of step c) is added before and/or during and/or after step d) and/or before and/or during step e).