Through our NYCO brand, Imerys is able to offer wollastonite in a range of particle sizes and aspect ratios as a highly effective functional filler in a variety of adhesive and sealant applications. Applications include structural, high temperature, pressure sensitive, hot melt, heat activated and UV curable adhesives and sealants.
Traditionally, the main reason for using fillers in adhesive and sealant formulations was to reduce costs. As the market’s demands on these applications have advanced, however, functional properties have increased in importance. Due to the chemistry and acicular structure of wollastonite, it has become a commercial mineral reinforcement in these applications, providing improved mechanical properties, sag resistance, rheology, cold temperature crack resistance and tensile strength.
The selection of the right product is dependent on the type of adhesive and sealant being produced, the desired performance criteria, and, if replacing an existing filler, the particle size and attributes of that filler. Through our long experience and expertise, we are able to offer a range of products for a variety of customer needs, from high brightness grades for wet-room sealants to fine and coarse powder grades for tile adhesives and grouts to chemically modified high-aspect-ratio grades for moisture sensitive systems and applications requiring excellent peel strength performance.
Most of our wollastonite grades are available in chemically modified formulations to enhance mechanical properties and dispersion if required. New product developments include wollastonite grades with very low moisture content and uptake designed specifically for reactive adhesives and sealants based on a range of polymer systems. In addition, the recent introduction of platy alluminosilicate Phyllomat F and surface treated Phyllocoat have increased the pallet of options for optimal properties, offering sufficient mechanical characteristics so as to maintain adhesive strength to the substrate during service life, as well as to provide enhanced barrier effects.