Abstract:
Halogenated alcohols used in gas phase polymerization of ethylene in combination with a Ti based catalyst component and aluminum alkyls as co-catalyst allows to efficiently suppress ethane formation and to simultaneously increase the polymerization activity.
Abstract:
The present disclosure relates to copolymer of butene-1 with hexene-1, particularly suited for the preparation of pipes, having the following features: 1) a content of hexene-1 comonomer units from 2 to 4% by weight; 2) a melting temperature TmI equal to or higher than 115°C.
Abstract:
A process for the polymerisation of olefins in the presence of a solid catalyst component and a catalyst activator, the process being performed in a gas-phase reactor having interconnected polymerization zones, where the growing polymer particles flow upward through a first polymerization zone (riser) under fast fluidization conditions, leave said riser and enter a second polymerization zone (downcomer) through which they flow downward under the action of gravity, leave said downcomer and are reintroduced into the riser, thus establishing a polymer circulation between said riser and said downcomer, the process being characterized in that said solid catalyst component has an average size P50 ranging from 20 μm to 65 μm and the gas flows upward in said first polymerization zone at a velocity ranging from 0.8 to 2.0 m/s.
Abstract:
A butene-1 polymer having: a) a Melt Flow Rate value of from 20 to less than 100 g/10 min., measured according to ISO 1133 at 190°C with a load of 2.16 kg; • b) an intrinsic viscosity (IV) measured in tetrahydronaphthalene (THN) at 135°C equal to lower than 0.95 dl/g; • c) a Mw/Mn value equal to or lower than 3.5, the lower limit being of 1.5; • d) a Mz value of 180,000 g/mol or higher; • e) a comonomer content, when comonomer is present, of up to 5% by weight.
Abstract:
A butene-1 polymer having: a) a Melt Flow Rate value of from 100 to 300 g/10 min., measured according to ISO 133 at 190°C with a load of 2.16 kg; b) an intrinsic viscosity (IV) measured in tetrahydronaphthalene (THN) at 135°C equal to lower than 0.70 dl/g; c) a Mw/Mn value equal to or lower than 2.8; d) a Mz value of 90,000 g/mol or higher; e) a comonomer content, when comonomer is present, of up to 10% by mole.
Abstract:
A butene-1 polymer composition having MFR values of from 400 to 2000 g/10 min, measured according to ISO 1133 at 190°C with a load of 2.16 kg, comprising: A) a butene-1 homopolymer or a copolymer of butene-1 with one or more comonomers selected from ethylene and higher alpha-olefins, having a copolymerized comonomer content of up to 5% by mole; B) a copolymer of butene-1 with one or more comonomers selected from ethylene and higher alpha-olefins, having a copolymerized comonomer content of from 6% to 25% by mole; said composition having a total copolymerized comonomer content from 5% to 18% by mole, referred to the sum of A) and B), and a content of fraction soluble in xylene at 0°C of 65% by weight or more, determined on the total weight of A) and B).
Abstract:
A butene-1 polymer composition having MFR values of from 400 to 2000 g/10 min, measured according to ISO 1133 at 190°C with a load of 2.16 kg, comprising: A) a butene-1 homopolymer or a copolymer of butene-1 with one or more comonomers selected from ethylene and higher alpha-olefins, having a copolymerized comonomer content of up to 5% by mole; B) a copolymer of butene-1 with one or more comonomers selected from ethylene and higher alpha-olefins, having a copolymerized comonomer content of from 6% to 20% by mole; said composition having a total copolymerized comonomer content from 4% to 15% by mole, referred to the sum of A) and B), and a content of fraction soluble in xylene at 0°C of 60% by weight or less, determined on the total weight of A) and B).
Abstract:
A catalyst system for the (co)polymerization of olefins, comprising (A) a solid catalyst component comprising a titanium compound supported on magnesium dichloride (B) an aluminum alkyl compound and (C) an halogenated organic ester of formula A-COOR in which R is a C 1 C 10 hydrocarbon group and A is a C 1 C 5 saturated or unsaturated hydrocarbon group in which at least one of the hydrogen atoms is replaced by chlorine. Said catalyst systems has improved polymerization activity and reduced ethane generation.
Abstract:
Feeding a supported antistatic compound that does not comprise a transition- metal-based catalyst component to an olefin polymerization reactor allows avoiding the formation of polymer agglomerates in the reactor while at the same time minimizing negative effects on catalyst yield.
Abstract:
There is described a process for the continuous solution polymerization comprising polymerizing olefins of formula CH2=CHR, wherein R is hydrogen or a hydrocarbon radical having from 1 to 8 carbon atoms, and wherein one of the olefins has at least five carbon atoms, in the presence of a polymerization catalyst and in the absence of an inert solvent, at a polymerization temperature (Tp) satisfying the following relationship: Tp ≥ Tm + 20°C wherein Tm is the melting temperature of the obtained polymer.