Abstract:
A processfor the preparation of propylene polymer compositions comprising from 50 to 90 % by weight of a propylene (co)polymer fraction insoluble in xylene at 25°C, and from 10 to 50% by weight of an ethylene copolymer fraction soluble in xylene at 25°C, said process comprising: (i)a first step of polymerizing propylene in the optional presence of ethylene and/or C 4 - C 10 alpha olefins, to produce a propylene (co)polymer being for at least 85% by weight insoluble in xylene at 25°C; and (ii)a successive step, carried out in gas-phase, in the presence of the product coming from step (i), of copolymerizing a mixture of ethylene with one or more α-olefins CH 2 =CHR in which R is a hydrocarbon radical having 1-10 carbon atoms, to produce an ethylene copolymer; the process being carried out in the presence of a catalyst system comprising: the product obtained by contacting: (a) a solid catalyst component comprising a magnesium halide, a titanium compound having at least a Ti-halogen bond and at least two internal electron donor compounds one of which being present in an amount from 35 to 90% by mol with respect to the total amount of donors and being selected from succinates and the other being selected from 1,3-diethers, the total amount of internal electron donor compounds being lower than 14.0% by weight with respect to the total weight of the solid catalyst component; with (b) an aluminum hydrocarbyl compound, and optionally with (c) an external electron donor compound.
Abstract:
A polyolefm 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 C4-C10 alpha-olefin containing from 20 wt% to 30 wt%, of said C4-C10 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.
Abstract:
A terpolymer containing propylene, ethylene and an alpha olefins of formula CH2=CHZ wherein Z is an hydrocarbon group having from 2 to 10 carbon atoms wherein: (i) the content of ethylene derived units ranges from 0.5 wt% to 5.0 wt%; (ii) the content of alpha olefin derived units ranges from 1.0 wt% to 5.0 wt%; (iii) the area of the DSC curve after the peak of the melting point (Tm) represents more than 22%; of the total area of the DSC curve; (iv) the polydispersity index (PI) ranges from 2.0 to 7.0.
Abstract:
A fiber comprising a terpolymer containing propylene, ethylene and an alpha olefin of formula CH2=CHZ wherein Z is an hydrocarbon group having from 2 to 10 carbon atoms, wherein: (i) the content of ethylene derived units ranges from 0.5 wt% to 5.0 wt%; (ii) the content of alpha olefin derived units ranges from 1.0 wt% to 5.0 wt%; (iii) the amount (Wt%) of alpha-olefin (C6), the amount (Wt%) of ethylene (C2) and the melting point (Tm) of the terpolymer fulfil the following relation: Tm>157-6*(C2+0.8C6) (iv) the melt flow rate (MFR) (ISO 1133 230°C, 2.16 kg) ranges from 10 to 100 g/10 min.
Abstract:
Articles, particularly pressure pipes, having high strength as well as high stiffness and very good impact resistance even at low temperatures can be obtained by using a heterophasic polyolefϊn composition comprising (percent by weight) 70-90% of a random copolymer of propylene with 0.5-6% of 1-hexene, and 10-30% of a polymer of ethylene with a C 3 -C 10 α- olefϊn and optionally a diene, wherein the polymer of ethylene has an ethylene content higher than 45% and an intrinsic viscosity [η] value from 3 to 5 dl/g. A particular advantage of the present invention is that articles comprising the above heterophasic polyolefϊn composition show a low ductile to brittle transition temperature (DBTT).
Abstract:
A polyolefin composition having good transparency and mechanical properties comprising, all percent amounts being by weight: A) from 70 to 98% of a propylene homopolymer or copolymer having haze of 25% or less and melting temperature of 130°C or higher; and B) from 2 to 30% of a butene-1 copolymer containing from 0.5 to 30% of one or more comonomer(s).
Abstract:
A propylene ethylene copolymer having: i) xylene soluble fraction at 25°C ranging from 30 wt% to 48 wt%; ii) intrinsic viscosity of the fraction soluble in xylene at 25°C ranging from 2.8 to 4.3 dl/g; iii) melt flow rate, MFR, measured according to ISO 1133 at 230 °C with a load of 2.16 kg, ranging from 0.2 g/10 min to 10 g/10 min; iv) an ethylene derived units content ranging from 10.3 wt% to 15.4 wt% v) the ethylene derived units content on the fraction insoluble in xylene at 25°C ranging from 6.1 wt% to 9.0 wt%; vi) the ethylene derived units content on the fraction soluble in xylene at 25°C ranging from 18.2. wt% to 30.2 wt%; vii) the 13C-NMR sequences PEP measured on the fraction insoluble in xylene at 25°C ranging from 4.1mol% to 6.5mol% and the 13C-NMR sequences PEP measured on the fraction soluble in xylene at 25°C ranging from 10.5 mol% to 14.2 mol%.
Abstract:
A mixture comprising: T1) from 99 wt% to 75 wt% of bitumen, and T2) from 1 wt% to 25 wt% of polymer composition comprising the following components, A) 5-35% by weight of a propylene homopolymer; B) 20-50% by weight; of an ethylene homopolymer; and C) 30-60% by weight of a terpolymer of ethylene, propylene and 1-butene derived units.
Abstract:
A polyolefin composition comprising a first heterophasic polyolefin polymer A) comprising a crystalline propylene homopolymer matrix, a propylene ethylene copolymer having an ethylene content ranging from 20.0 wt% up to 35.0 wt%, a propylene ethylene copolymer having an ethylene content ranging from 55.0 wt% up to 70.0 wt%, and a second heterophasic polyolefin polymer B) comprising a crystalline propylene homopolymer matrix, a propylene ethylene copolymer having an ethylene content ranging from 40.0 wt% up to 50.0 wt%, and an ethylene exolefin copolymer having an ethylene content ranging from 65.0 wt% up to 85.0 wt%.
Abstract:
An injection molded article comprising a propylene based composition comprising: Tl) from 90 wt % to 50 wt% of a propylene homopolymer; T2) from 10 wt % to 50 wt% of a polymer composition comprising: A) 5-35% by weight of a propylene homopolymer or a propylene ethylene copolymer; B) 25-50% by weight; of a copolymer of ethylene and a C3-C8 alpha-olefin containing from 0.1% to 20% by weight of alpha-olefin units; and C) 30-60% by weight of a copolymer of ethylene and propylene containing from 25% to 75% by weight of ethylene units;