Process for the preparation of random copolymers

Details Process for the preparation of random copolymers Process for the preparation of random copolymers

C - Chemistry, Metallurgy

08

F

402/645

C08F 210/06 (2006.01) C08F 2/34 (2006.01) C08F 4/64 (2006.01)

Patent

CA 1324234

- 24 - PROCESS FOR THE PREPARATION OF RANDOM COPOLYMERS Abstract of the Invention A process for the copolymerization of at least the two comonomers, propylene and ethylene, comprising contacting the comonomers in the gas phase in at least one reaction zone, under polymerization conditions, with a catalyst system comprising (i) a solid catalyst precursor, which includes magnesium; titanium; a halogen which is chlorine, bromine, or iodine, or mixtures thereof; and a polycarboxylic acid ester containing two coplanar ester groups attached to adjacent carbon atoms; (ii) a hydrocarbyl aluminum cocatalyst; and (iii) a silicon compound containing at least one silicon-oxygen-carbon group wherein the atomic ratio of aluminum to titanium is in the range of about 5 to about 300, with the proviso that the temperature in the reaction zone is in the range of about 50°C to about 150°C; the molar ratio of aluminum to silicon compound is in the range of about 0.5 to about 100: the propylene partial pressure is in the range of about 50 to about 600 psi; and the ethylene partial pressure is in the range of about 0.25 to about 25 psi .

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