Abstract:
A polypropylene composition comprising: A) from 88.0 wt. % to 98.0 wt. %, of a copolymer of propylene containing from 0.8 wt. % to 4.8 wt. % of 1-hexene derived units; said random copolymers of propylene having: - a Melt Flow Rate: measured according to ISO 1133 (230 °C, 5 Kg) ranging from 0.5 to 4.4 g/10 min; B) from 2.0 wt. % to 12.0 wt. % of a terpolymer of propylene ethylene and 1-hexene having a content of ethylene derived units ranging from 35 wt. % to 60 wt. %; and a content of 1-hexene derived units ranging from 1 wt. % to 6 wt. %; wherein the polypropylene composition is endowed with a Melt Flow Rate: measured according to ISO 1133 (230 °C, 5 Kg) ranging from 0.5 to 5.0 g/10 min.
Abstract:
A propylene 1-hexene copolymer containing from 5.7 to 7.7% by weight, of 1-hexene derived units having: a) solubility in xylene at 25° C ranging from 7.0 wt% to 15.0 wt%; b) the melting temperature, measured by DSC ranging from 143.0 °C to 148.0° C; c) Melt Flow Rate (MFR, measured according to ASTM D 1238, 230°C/2.16 kg, from 3.5 to 8.0 g/10 min. d) content of 1-hexene derived units in the fraction soluble in xylene at 25°C ranging from 13.5 wt% to 18.5 wt%
Abstract:
A polyolefin composition comprising: A) from 19 wt% to 50 wt% of a propylene ethylene copolymer having an ethylene derived units content ranging from 1.5 wt% to 6.0 wt% B) from 50 wt% to 81 wt% of a propylene ethylene 1-butene terpolymer having an ethylene derived units content ranging from 1.5 wt% and 6.0 wt% and 1-butene derived units content of between 4.8 wt% and 12.4 wt%; the sum of the amount of component A) and B) being 100; the composition being characterized by the following features: - molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than 4.0; - the creep and recovery curve measured on the polymer fuse at 200°C measured accordingto the procedure reported in the characterizing section shows a maximum value between 600 and 200 seconds lower than 53x10 -4 1/Pa.
Abstract:
Polyolefin compositions comprising: (A) 5-35% by weight of a propylene-based polymer containing 90% by weight or more of propylene units and containing 10% by weight or less of a fraction soluble in xylene at 25°C (XS A ); (B) 25-50% by weight, of an ethylene homopolymer containing 5% by weight or less of a fraction soluble in xylene at 25°C (XS B ) referred to the weight of (B); and (C) 30-60% by weight, of a copolymer of ethylene and propylene containing from 25% to 75% by weight of ethylene units and containing from 55% to 95% by weight, of a fraction soluble in xylene at 25°C (XS C ). The composition has 20% by weight or less of a fraction obtained in the second fractionation step in a preparative fractionation method.
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 terpolymer compositions comprising: A) From 80 wt% to 97 wt%; of a propylene, ethylene, 1-butene terpolymer having: i) the content of ethylene derived units ranging from 0.5 wt% to 3.2 wt%; ii) the content of 1-butene derived units ranging from 7.2 wt% to 14.8 wt% B) From 20 wt% to 3 wt%; of a propylene, ethylene, 1-butene terpolymer having: i) the content of ethylene derived units ranging from 0.5 wt% to 3.2 wt%; ii) the content of 1-butene derived units ranging from 14.4 wt% to 26.5 wt%; and the terpolymer composition has the melt flow rate, MFR, measured according to ISO 1133 at 230 °C with a load of 2.16 kg, ranging from 3.0 g/10 min to 20.0 g/10 min; the sum of the amounts of A) and B) being 100 wt%.
Abstract:
A propylene composition comprising (percent by weight): A) 70%-95%, of a propylene homopolymer having a Polydispersity Index (P.I.) value of from 4.6 to 10, a fraction insoluble in xylene at 25 °C, higher than 90 %, and MFR L (Melt Flow Rate according to ISO 1133, condition L, i.e. 230°C and 2.16 kg load) from 47 to 90 g/10 min; B) 5%-30%, of a copolymer of propylene containing from 40% to 34.5% extremes included of ethylene derived units; the composition having an intrinsic viscosity of the fraction soluble in xylene at 25 °C comprised between 3 and 5 dl/g.
Abstract:
Fibers comprising a polypropylene obtainable by a process comprising the steps of: (i) polymerizing propylene 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, to obtain a polypropylene precursor having a melt flow rate MFRl; (ii) subjecting the thus-obtained polypropylene precursor to visbreaking to obtain a visbroken polypropylene having a melt flow rate MFR2; (iii) spinning the visbroken polypropylene obtained in the previous step; wherein MFR2 is comprised between from 15 to 40 g/10min, the ratio MFR2/MFR1 is comprised between 8 and 18, both MFRl and MFR2 being measured according to ISO method 1133 (230° C, 2.16 kg).
Abstract:
A polymer composition comprising (per cent by weight): a) 70-84% of a crystalline propylene polymer having an amount of isotactic pentads (mmmm), measured by 13 C-MNR on the fraction insoluble in xylene at 25° C, higher than 97.5 molar %; b) 8 -15% of an elastomeric copolymer of ethylene and propylene, the copolymer having an amount of recurring units deriving from ethylene ranging from 25 to 50 wt% and being partially soluble in xylene at ambient temperature; the polymer fraction soluble in xylene at ambient temperature having an intrinsic viscosity value ranging from 2.5 to 3.5 dl/g; and c) 8-15% of ethylene homopolymer having an intrinsic viscosity value ranging from 1.5 to 4 dl/g; said composition having a value of melt flow rate ranging from 55 to 90 g/10 min, and the amount of hexane extractables lower than 3.5 wt%,.
Abstract:
A polypropylene composition comprising: A) from 76 wt% to 95 wt% of a propylene homopolymer having: - fraction soluble in xylene at 25°C comprised between 2.0 wt% and 4.5 wt%; - melt flow rate (MFR L according to ISO 1133, condition L, i.e. 230°C and 2.16 kg load) ranging from 60.0 to 110.0 g/10 min; B) from 5 wt% to 24 wt%, of a copolymer of propylene and ethylene containing from 75 wt% to 90.0 wt%, of ethylene derived units; wherein in the polypropylene composition: the content of ethylene derived units in the fraction soluble in xylene at 25°C is lower than - the content of ethylene derived units of component B) and ranges from 51.0 wt% to 74.0 wt%, the polypropylene composition has at least two melting points, the higher ranging from 156.0 °C to 166.0 °C and the lower ranging from 90.0 °C to 125.0°C; and the sum of the amounts of component A) and B) being 100 wt%.