Abstract:
A terpolymer containing propylene, ethylene and 1-hexene obtainable by the step of copolymerizing propylene, ethylene and 1-hexene in the presence of a catalyst system comprising the product obtained by contacting the following components: (a) a solid catalyst component comprising a magnesium halide, a titanium compound having at least a Ti-halogen bond and at least two electron donor compounds one of which being present in an amount from 40 to 90% by mol with respect to the total amount of donors and selected from succinates and the other being selected from 1,3 diethers, (b) an aluminum hydrocarbyl compound, and (c) optionally an external electron donor compound. wherein in the terpolymer (i) the content of 1-hexene derived units ranges from 0.5 to 5.0 wt%; (ii) the content of ethylene derived units is higher than 1.4 t% and fulfils the following relation (1): C �¢ 2
Abstract:
A process for the preparation of propylene polymer compositions carried out in the presence of a catalyst system comprising (a) a solid catalyst component having average particle size ranging from 15 to 80 μm comprising a magnesium halide, a titanium compound having at least a Ti-halogen bond and at least two electron donor compounds one of which being present in an amount from 50 to 90% by mol with respect to the total amount of donors and selected from succinates and the other being selected from 1,3 diethers, (b) an aluminum alkyl and optionally (c) an external electron donor compound, and comprising the following steps: (i) contacting the catalyst components (a), (b) and optionally (c); (ii) pre-polymerizing up to forming amounts of polymer from about 0.1 up to about 1000 g per gram of solid catalyst component (a); (iii) polymerizing propylene producing a propylene (co)polymer being for at least 85% by weight of insoluble in xylene at 25° C. and (iv) in a successive step, carried out in gas-phase, polymerizing mixtures of ethylene with α-olefins CH2═CHR in which R is a hydrocarbon radical having 1-10 carbon atoms, to produce the said ethylene copolymer.
Abstract:
Propylene terpolymers are prepared by polymerizing propylene, ethylene and an alpha-olefin selected from the group of C4-C8 alpha-olefins in the presence of a catalyst system obtained by contacting a solid catalyst component comprising a magnesium halide, a titanium compound having at least a Ti-halogen bond and at least two electron donor compounds one of which being present in an amount from 40 to 90% by mol with respect to the total amount of donors and selected from succinates and the other selected from 1,3 diethers, an aluminum hydrocarbyl compound, and optionally an external electron donor compound.
Abstract:
A propylene, ethylene, 1-butene terpolymer containing from 0.5 wt% to 2.2 wt% of ethylene derived units and from 6.0 wt% to 20.0 wt% of 1 butene derived units; wherein: i) the ratio C2wt%/C4wt% ranges from 0.09 to 0.06; wherein C2wt% is the weight per cent of ethylene derived units and C4wt% is the weight per cent of 1-butene derived units; ii) the Melt flow rate ranges from 0.4 to 54 g/10 min; iii) the xylene soluble fraction at 25°C is lower than 15.0 wt% the minimum value being 5.0 wt%.
Abstract:
A propylene ethylene 1-butene terpolymer wherein: (i) the content of ethylene derived units ranges from 0.5 wt% to 2.0 wt%, (ii) the content of 1-butene rangesfrom 5.0 wt% to 8.0 wt%, (iii) the melting point (Tm) ranges from 136°C to 148°C; wherein said terpolymer is obtained with a polymerization process carried out in a gas-phase polymerization reactor comprising at least two interconnected polymerization zones.
Abstract:
A polyolefin compositions comprising: A) From 77 wt% to 90 wt%, of a propylene homopolymer having the fraction soluble in xylene at 25°C lower than 2 wt%; B) from 10 wt% to 23 wt% of a copolymer of ethylene with one C 4 -C 10 alpha-olefin containing from 20 wt% to 30 wt%, of said C 4 -C 10 alpha-olefin derived units; said composition having - the value of melt flow rate (MFR) at 230 °C, 2.16 kg of from 0.5 to 4.5 g/10 min; - the total content of ethylene of from 10 wt% to 18 wt%; - the value of the intrinsic viscosity of the total fraction soluble in Xylene at 25°C (AMXSIVtot) is less than 1.5 dl/g.