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Silicone - masterbatches, oils, gums and powders- as additives for thermoplastics, elastomers and TPE

SpecialChem / Nov 24, 2003

The silicone oils or gums have beneficial effects as additives in other polymers but their incorporation is difficult. Some producers as Dow Corning, DuPont, Micropol propose free flowing powders or masterbatches of silicone in different plastics, thermoplastics and TPE. Potential applications are various. The level of the silicone, fluid or gum, varies from 10 % to 50 %. The silicone form can be oil from more or less high viscosity, or UHMW gum from more or less high molecular weight (Mn up to 300,000 with viscosity above 15 million cst). The most current thermoplastic matrices are polyethylene (HDPE, LDPE, LLDPE), polypropylene, high impact polystyrene, polyacetal, nylon 6, EVA, Hytrel. The particle sizes of the silicone in the masterbatch are less than 10 microns with an average value in the order of 2 microns. The silicone masterbatches are often approved for food contact. In USA, some specific grades are agreed FDA (regulation 121-2514) for polymeric coatings used as a food contact surface.

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