Commercialized four years ago by ExxonMobil Chemical, Houston, Vistamaxx olefinic TPE was used originally for spunbond nonwovens because of its elasticity. Now, Vistamaxx is being used to toughen PP copolymers and styrenic TPEs without reducing clarity. Vistamaxx is a metallocene-catalyzed, elastic PP random copolymer of clear crystalline PP with amorphous domains of ethylene copolymer and syndiotactic PP. Vistamaxx 6202, with 0.861 g/cc density and MFR of 18 g/10 min, is being blended at 15% to 25% with clear PP copolymer to improve low-temperature impact. Higher levels of Vistamaxx 6202 in PP produced “No Break” results in notched Izod impact tests at down to -20 C (see chart). Another grade, Vistamaxx 6100 can be used to reduce cost in TPE compounds of SEBS, PP, and oil. In a compound with 30% SEBS, 20% PP, and 50% oil, substituting 10% to 30% of the SEBS fraction with Vistamaxx 6100 substantially improves tensile and tear strength. (330) 849-5272 • www.exxonmobilchemical.com
ExxonMobil Chemical Co.
13501 Katy Freeway W3-460
Houston, TX 77079
Phone (281) 870-6000 Fax (281) 870-6661