Reactive surface treatment of calcium carbonate by using aminocapronic acid and silanes

Surface area of precipitated calcium carbonate was modified by using difuncional compound - aminocapronic acid. This modification led to increase the porosity of the filler. As a result of the modification the z potential of the water dispersions of the filler changed. We also tried to modify CaCO3 by using silanes coupling agents as a second modifying agent of the calcium carbonate so that interaction between fillers particles and elastomers matrix increased. The activity of modified fillers in butadiene-acrylonitrile NBR and its carboxylated modification XNBR was studied.