PROCESSING | PROCESS AIDS AND LUBRICANTS
Khan concluded that when choosing a master-
batch, film producers should be aware of possible interactions with any PPAs in the base resin formulation and preferably use a single chemistry of PFAS-free PPA to avoid the potential of antago- nistic effects. The latest introduction from CAI Performance Additives is the ST-PA229C series of lubricant additives for polyesters. The company says the new additives offer improvements over traditional lubricants (including silicone, Montan wax and others) and can be used in PET, PBT, and PET/PBT alloys. Benefits are said to include improved dispersion and compatibility of fillers such as flame retardants and enhanced flow (increased melt flow index). The additive can also broaden the tempera- ture range at which PET crystallisation begins, which can lead to shorter cycle times and energy savings in converting processes, such as injection moulding or film or sheet extrusion. CAI’s ST-PA210 lubricating agent is suitable for
use in resins including polystyrene and bioplastics such as PLA, where it can also increase flow and enhance dispersion of fillers such as carbon black and talc. The company says that data from a
third-party lab study that simulated the impact of processing on the additive material suggests only trace amounts remain after processing. CAI CEO Richard Marshall says this means that using such an additive would not affect food-contact suitability of end-use products such as food and beverage containers.
Bio-based solutions A recent study investigating the performance of Cargill’s bio-based IncroMax 100 additive in biaxially oriented PET (BOPET) films found it provided advantages in the orientation process as well as efficient lubrication during extrusion and in post-extrusion processing. The organic migrating additive is made from 100% bio-based carbon content (tested according to ASTM D6866) and has food contact approval statements available. IncroMax 100 provides multiple benefits across the BOPET manufacturing process, according to Emile Homsi, Associate Director of R&D for Polymer Additives at the company. During film extrusion, it acts as both an internal and external lubricant; post-extrusion it helps with release from the film rollers; and in the final film product it provides
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