Clariant Masterbatches Division said its CESA-extend additive masterbatches have received Food and Drug Administration sanction for food-contact packaging applications.
CESA-extend helps extruders boost melt strength and throughput for lower-viscosity resins such as PET, recycled PET and regrind. The additive masterbatch restores the resin's intrinsic viscosity, making a stiffer extrudate that is less prone to sagging.
Clariant of Holden, Mass., uses an oligmeric reactant, Joncryl ADR 4368 from Johnson Polymer LLC of Sturtevant, Wis., to restore intrinsic viscosity. CESA-extend masterbatches can be made with a range of carrier resins. Besides polyesters, they can improve processability of polycarbonate, thermoplastic urethanes, polylactic acid and nylons, according to Clariant.
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