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Carbon Black Filled Metallocene Ethylene-Octene Copolymers

Recently, the innovative metallocene based catalyst technology has offered a new class of olefin polymers with molecular structures different from the traditional polyolefins produced with Ziegler-Natta catalysts. Metallocene polyolefins exhibit improved clarity, flexibility and impact resistance in comparison with conventional polyolefins. The object of this study was to evaluate the electrical and mechanical properties of a carbon black filled conductive polymer using a metallocene based ethylene copolymer, Engage ® EG-8100, which is produced by Dow Plastics. Carbon black contents from 8 to 10% by weight in Engage® were shown to be suitable for anti-static applications. Furthermore, carbon black-filled Engages® in the range from 12 to 20 weight percent of carbon black contents were suitable for electro-static discharge (ESD) applications. Flexural modulus, hardness, tear resistance, secant modulus, tensile strength and elongation at break were measured. The results showed a significant change in the dependence on carbon loading level at a critical concentration around 12%, which is near the percolation concentration. The relative resistivity of the 15 and 20% filled compositions showed a strong dependence on elongation.