Process for the gas-phase polymerization of olefins

Details Process for the gas-phase polymerization of olefins Process for the gas-phase polymerization of olefins

C - Chemistry, Metallurgy

08

F

C08F 10/00 (2006.01) C08F 2/34 (2006.01) C08F 4/642 (2006.01) C08F 210/16 (2006.01)

Patent

CA 2088681

Process for the gas-phase polymerization of olefins of the formula CH2 -CHR in which R is hydrogen or an alkyl or aryl radical with 1 to 8 carbon atoms carried out in one or more reactors having a fluidized or mechanically agitated bed, using a catalyst obtained by reaction of a titanium halide or haloalcoholate and optionally an electron-donor compound supported on an active Mg dihalide with an Al-trialkyl compound and optionally an electron-donor compound, comprising the steps of: a) contacting the catalyst components; b) prepolymerizing propylene or mixtures of propylene with minor amounts of ethylene or an alpha-olefin to form a crystalline propylene polymer; and c) polymerizing one or more CH2 = CHR olefins in the gas phase in the presence of the prepolymer-catalyst system obtained in b) while maintaining in the gas phase an alkane in a molar concentration with respect to the olefin of from 20 to 80 %.

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