Abstract: Chelated titanate coupling agent was used to modify precipitated calcium carbonate (PCC), after that the slurry was collected and calcined at 550 ℃ to obtain modified PCC.The modified PCC was characterized by XRD, XPS and FTIR.It can be inferred from the results that calcium titanate crystal and oxide of Ti4+ exist on the surface of the modified PCC.The modified PCC is used as filler to prepare handsheets.Brightness increases slightly, mechanical properties decrease to some extent and filler retention don't change apparently for handsheet with modified PCC as filler compared to control PCC.

Key words: titanate coupling agent;precipitated calcium carbonate;calcium titanate;papermaking