A new family of metallocene-based PP copolymers reportedly offers unprecedented “glass-like” clarity similar to PC and PETG, along with good physical properties and processability. Developed by Basell North America Inc., a LyondellBasell company, Wilmington, Del., the new Pristene family initially contains two nucleated grades: RM 2091, said to be the “first of its kind” low-MFR (3.5 g/10 min.) PP copolymer for use in extrusion blow molding, injection-blow, and extrusion/thermoforming; and RM 2073, a high-fl ow (40 MFR) grade for injection molding. Both grades allow molders to achieve 2% haze in 1-mmthick plaques, compared with 6% to 10% haze values for existing PP resins. The 2% haze in test plaques translates into haze levels of 5% to 6% in injection and blow molded parts, depending on the thickness. Pristene RM 2091 blow molding grade boasts excellent melt strength and is being aimed at baby bottles, food/beverage containers, and personal-care items, as a BPA-free alternative to PC. It also offers better chemical resistance and lower cost than PETG for cosmetics packaging. It is suitable for hot-fill bottles and for applications requiring toughness at refrigerator temperatures. Pristene RM 2073 injection molding grade is said to offer excellent shear-thinning behavior for improved molding productivity and potential for reduced wall thickness. It also boasts improved chemical resistance. Potential applications include food and beverage packaging, foodservice trays/covers, drink cups, pitchers, storage containers, CD/DVD cases, and medical devices. Compared with PC, RM 2073 exhibits better ESCR and lower processing temperatures. (302) 683-8000 • www.lyondellbasell.com
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