C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/418, 402/613
C08F 2/34 (2006.01) C08F 10/00 (2006.01) C08F 210/06 (2006.01) C08F 210/16 (2006.01)
Patent
CA 2023653
Case 1297/B206(2) ABSTRACT OF THE DISCLOSURE PROCESS FOR PREPARING IN GAS PHASE ELASTOMERIC COPOLYMERS OF PROPYLENE The present invention relates to a process for manufacturing in gas phase copolymers of propylene with 20 to 80% by weight of ethylene and/or 1-butene and optionally one or more C5 to C12 alpha-olefins. The catalyst used in the process is obtained by contacting a spherical MgCl2 support containing an organic electron-donor D1 free from labile hydrogen with an internal electron-donor D3 chosen from aromatic carboxylic acid esters, and then with TiCl4, the support having a well-defined diameter ant a narrow particle size distribution. The process comprises in a first stage a prepolymerisation performed by contacting propylene with the catalyst and a cocatalyst consisting of a trialkylaluminium and/or of an alkylaluminium halide not complexed with an external electron-donor. In a second stage, the copolymer is obtained by contacting the prepolymer with an alpha-olefin mixture containing 20 to 80% by volume of propylene.
Bailly Jean-Claude Aandre
Bordere Louis
Bp Chemicals Limited
Fetherstonhaugh & Co.
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