Surface durability is a critical attribute to maintain the perceived quality of polypropylene (PP) vehicle interior parts. Silicone additives are known to improve the processing and surface characteristics of plastics. Yet, the newer UHMW siloxane masterbatch additives surpass lower-molecular-weight additives such as polydimethylsiloxane (PDMS) fluids or amides in terms of molded-in surface stability. They are supplied as dry, free-flowing pellets and used in very low concentrations for producing highly scratch-resistant interior components made of PP and other thermoplastic polyolefins (TPOs).
The siloxane masterbatch additives of Dow Corning are formulated as a fine-particle-size dispersion of UHMW silicone in a carrier resin, compatible with that of the end product. Unlike silicone fluids or various organic additives, the UHMW siloxane additives remain stable in finished components. They can add a softer, silky feel and provide long-lasting antiscratch performance without exuding. They do not create stickiness or add volatile organic compounds (VOCs). Printing and painting are unaffected.