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Received January 10, 2002
Accepted March 5, 2002
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Preparation of Inorganic MgCl2-Alcohol Adduct and Its Application in Organometallic HYBRID Catalysts for Ethylene Polymerization
Division of Chemical Engineering, College of Engineering, Seoul National University, Shinlim-Dong, Kwanak-Ku, Seoul 151-742, Korea
Korean Journal of Chemical Engineering, July 2002, 19(4), 557-563(7), 10.1007/BF02699295
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Abstract
Inorganic support, MgCl2-alcohol adduct, for use in the impregnation of organometallic catalysts, was prepared by the recrystallization method using alcohol. Since MgCl2-alcohol adduct has two functional groups in the molecule, i.e., hydroxyl (-OH) and chlorine (-Cl) groups, it is suitable for the impregnation of both metallocene and Ziegler-Natta hybrid catalysts. The hybrid catalysts were prepared in order to control the molecular weight (Mw) and the molecular weight distribution (MWD) in ethylene polymerization. The polyethylene produced by the Ziegler-Natta/Metallocene hybrid catalysts showed two melting temperatures and a bimodal MWD, corresponding to products arising from each of the individual catalysts. This suggests that these hybrid catalysts acted as individual active species and produced a blend of polymers.
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References
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Cho HS, Choi KH, Choi DJ, Lee WY, Korean J. Chem. Eng., 17(2), 205 (2000)
Cho HS, Chung JS, Lee WY, J. Mol. Catal. A-Chem., 159, 203 (2000)
Cho HS, Chung JS, Han JH, Ko YG, Lee WY, J. Appl. Polym. Sci., 70(9), 1707 (1998)
D'Agnillo L, Soares JBP, Penlidis A, J. Polym. Sci. A: Polym. Chem., 36(5), 831 (1998)
Ishihara N, Kuramoto M, Uoi M, Macromolecules, 21, 3356 (1988)
Kaminsky W, Scheirs J, "Metallocene-Based Polyolefins," John Wiley & Sons, New York, 173 (2000)
Kaminsky W, Bark A, Arndt M, Makromol. Chem. Macromol. Symp., 47, 83 (1991)
Kim I, Woo SI, Korean J. Chem. Eng., 7(2), 95 (1990)
Ko YG, Cho HS, Choi KH, Lee WY, Korean J. Chem. Eng., 16(5), 562 (1999)
Magalhaes DNT, Filho ODC, Coutinho FMB, Eur. Polym. J., 27, 827 (1991)
Magalhaes DNT, Filho ODC, Coutinho FMB, Eur. Polym. J., 27, 1093 (1991)
Park HM, Lee WY, Eur. Polym. J., 28, 1417 (1992)
Razavi A, U.S. Patent, 5,914,289 (1999)
Sinn H, Kaminsky W, Adv. Organomet. Chem., 18, 99 (1980)
Soga K, Kaminaka M, Macromol. Chem. Phys., 195, 1369 (1994)
Soga K, Kaminaka M, Makromol. Chem. Rapid Commun., 12, 367 (1991)
Soga K, Kaminaka M, Macromol. Chem. Rapid Commun., 13, 221 (1992)
Woo SI, Ko YS, Han TK, Park JW, Huh WS, "Olefin Polymerization Catalyzed over Zeolite-Supported Metallocene Catalysts," Proceeding of Metallocenes '96, Schotland Business Research, Germany, 271 (1986)
Zambelli A, Pellecchia C, Oliva L, Longo P, Grassi A, Makromol. Chem., 192, 223 (1991)
