New Styrenic Copolymers Bring High Productivity

Thermoformers reportedly can double production rates for food containers with new styrenic copolymers from Nova Chemicals, Moon Township, Pa.

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Thermoformers reportedly can double production rates for food containers with new styrenic copolymers from Nova Chemicals, Moon Township, Pa. We first reported on these grades last December. The latest data show that Dylark FG 2500, an SMA, and Zylar EX 720, a clear styrene-acrylic, provide increased toughness and broad temperature performance. Zylar EX 720, an alternative to PET, PVC, PP, and SBC blends, boasts excellent clarity and toughness at temperatures down to -40 F. It remains ductile at freezer temperatures and reportedly processes more easily than PP. It can be downgauged in many applications because it is 20% stiffer than competing materials. For instance, Clear Pack Co., a thermoformer in Franklin Park, Ill., used Zylar EX 720 to replace PP in produce trays. The company reduced tray thickness from 50 to 30 mils and doubled production to 100 parts/min. Dylark FG 2500, Nova’s first SMA resin for applications other than auto instrument panels, provides “freezer-to-microwave” performance from -40 F to 250 F. The material maintains stiffness even during elevated microwave heating, unlike competing filled and unfilled PPs, Nova claims.