ExxonMobil Chemical touts Vistamax propylene-based elastomers to boost performance of polypropylene in thermoforming of beverage cups, containers and lids.
Use of homopolymer PP can lack detail, provide incomplete forming or cracking during manufacture, claims the Houston-based company. Low flexibility and poor low-temperature impact resistance of PP can damage products during handling. Poor clarity is often a problem when a polyethylene-based impact modifier is added.
ExxonMobil said Honghua Machinery Plastics & Rubber Co. Ltd. of Hongua, China, has studied the main materials used in packaging thermoforming and found many problems can be avoided using Vistamaxx elastomers. For applications requiring a balance of impact resistance, clarity and stiffness, Honghua developed a dry blend of 5 to 10 percent Vistamaxx 3020 with PP. This helped prevent cup breakage during production and transportation. In another approach a low dosage of Vistamaxx 6102 added to PP boosts impact resistance and maintains clarity, while avoiding die-cutting problems at low cost.
Vistamaxx readily blends with homopolymer PP and random copolymer PP. Increased flow can reduce processing temperature and increase processing rate.
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