Abstract
AbstractThe activities of two (n‐BuCp)2ZrCl2 catalysts supported on methylaluminoxane (MAO)‐treated polymer particles were evaluated. The supports were spherical polymeric particles, containing macropores and prepared by suspension polymerization of 2‐hydroxyethyl methacrylate, divinyl benzene, ethyl styrene, and styrene. Both catalysts had a Zr content of 0.31 mass % and an Al/Zr ratio of 185; the supports for one of the catalysts contained 59 mass % 2‐hydroxyethyl methacrylate, whereas the support for the other catalyst had a 2‐hydroxyethyl methacrylate content of 10 mass %. Ethylene homo‐ and ethylene/1‐hexene copolymerization activities were determined for gas‐phase operation at temperatures of 50 to 90°C and ethylene pressures of ≈1.4 MPa. Polymerization activities were strong functions of temperature and 1‐hexene concentration; copolymerization activities of up to 23,200 kg PE/(mol Zr h−1) were obtained for 1‐h polymerization runs. The product particle morphology was excellent, mostly spherical particles essentially without fines. Scanning electron microscopy showed that the spherical copolymer particles, for all copolymerization conditions, consisted of well‐defined concentric spherical shells. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90:1319–1330, 2003
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