| abstract |
A process for preparing a 1-butene homopolymer or a 1-butene / alpha olefin copolymer comprising contacting 1-butene or 1-butene with one or more alpha olefins under polymerization conditions in the presence of a catalyst system, comprising: Wherein the alpha olefin is selected from ethylene, propylene or alpha olefins of the formula CH 2 = CHZ, wherein Z is a C 3 -C 20 alkyl radical: (a) a solid component comprising a Ti compound and an internal electron-donor compound supported on MgCl 2 (b) alkylaluminum cocatalysts; And (c) a compound of formula (I) as external donor: [Wherein, R 1 , R 2 , R 3 , R 4 and R 5 are hydrogen atoms or C 1 -C 20 hydrocarbon radicals, or two R 1 , R 2 , R 3 and R 4 are bonded to C 5 -C 20 may form a saturated or unsaturated ring. |