Abstract:
A gas-phase process for the homopolymerization or copolymerization of propylene with other olefins, including carrying out the polymerization in the presence of a catalyst system made from or containing: (a) a solid catalyst component made from or containing Mg, Ti, halogen, an electron donor selected from 1.3-diethers and an olefin polymer in a specific amount; (b) an aluminum alkyl compound and (c) an external electron donor (ED) compound, wherein components (b) and (c) being employed in amounts such that the Al/(ED) molar ratio ranges from about 2 to about 200.
Abstract:
A pre-polymerized catalyst component for the polymerization of olefins, characterized by comprising a non-stereospecific solid catalyst component, comprising Ti, Mg and a halogen and an amount of a (co)polymer of an alpha-olefin CH 2 =CHR1, wherein R is a C 1 C 12 hydrocarbon group, ranging from 0.1 up to 500g per g of said solid catalyst component, said (co)polymer being characterized by an isotacticity, expressed in terms isotactic pentads, of higher than 60% molar and by an intrinsic viscosity, measured in tetraline at 135°C, of at least 1.0 dL/g.
Abstract:
Spherical adducts comprising a MgCl 2 , an alcohol ROH in which R is a C1-C10 hydrocarbon group, present in a molar ratio with MgCl 2 ranging from 0.5 to 6 and less than 20% mol based on the mol of MgCl 2 of a compound of formula Mg(OR 1 ) 2 in which R 1 is selected from C1-C10 alkyl groups or R 2 CO groups in which R 2 is selected from C1-C6 alkyl or aryl groups.
Abstract:
Solid adducts comprising MgCl2 and an alcohol ROH in which R is a C1-C20 hydrocarbon group, in which the amount of alcohol ranges from higher than 42% to 60% by weight and the porosity determined with Hg method due to pores up to 1 μm and expressed in cm3/g, is such that the value of its ratio with the amount of alcohol in percentage falls above the straight line defined by the equation y=−0.0158x+1.03 in which y is the porosity of the adduct and x is the alcohol percentage by weight.