A method for the preparation of zinc containing calcium carbonate particles for c.g. cosmetics, rubber, and other polymer materials, is disclosed. As compared to rubber formulations with zinc oxide and core materials added separately, formulations including the present coated particles may have a higher transparency, lower Mooney viscosity and lower minimum torque, improved dispersability, a higher modulus at 100% and/or at 300% elongation, a higher tensile strength, better aging resistance, better abrasion resistance, lower density, and/or lower heat build up in rubber formulation. Thus, rubber products containing the prepared particles may enjoy similar or better properties than comparative products that include a conventional filler and/or zinc oxide per se, and the present coated particles may result in cost savings for the corresponding product formulations.
