MINERAL FILLERS | ADDITIVES
NatFeel has a nucleating effect that promotes crystallisation and increases the glass transition temperature, says Ercoli Malacari. This effect raises the use temperature above the boiling point of water so that the plastic compound can be used in hot food or hot beverage applications, including thermoformed coffee pods. The high purity of NatFeel meets demanding food contact requirements and minimises the presence of elements (such as fluorine) that might affect compostability certification, says Ercoli Malacari. In PBS and PBSA, NatFeel serves primarily to increase stiffness, which makes it possible to use the plastics in rigid packaging. The talc product also reduces polymer shrinkage while preserving dimensional stability (ie, limited or no deforma- tion). In addition, if properly dispersed, the filler can increase barrier properties in films.
Fillers in recyclates Mineral fillers can further reduce the carbon footprint of compounds containing recycled material, says Thorsten Hilgers, Project Manager Thermoplastics at HPF Minerals. He notes that the Industrial Minerals Association Europe has pub-
lished performance data for selected high-volume industrial minerals that provides average repre- sentative environmental footprint values for industrial minerals in Europe, based on ISO 14040-14044 standards. “We are in the process of developing company specific – or rather product specific – footprints, taking into account our multiple efforts to implement sustainable meas- ures,” says Hilgers. “Comparing these data with other materials like metals or polymers it can be stated that the environmental footprint of these natural industrial minerals is rather small.” Functional fillers also add reinforcement. For
example, the company’s needle-shaped wollas- tonite Tremin 939 is used as a reinforcing filler in both recyclates and virgin polymers. The latest from HPF Minerals is the Rescofil
odor-absorbing filler for thermoplastic compounds containing post-consumer recyclate. At 5 wt.% in a PCR PP, for example, the filler successfully reduced odor below the “clearly noticeable” threshold level of three in olfactometric testing according to the VDA 270 standard. HPF has also previously investigated the performance of its high-performance mineral fillers
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