Abstract:
A film comprising a polypropylene composition comprising: A) from 50 wt% to 90 wt%; of a propylene homopolymer; B) from 10 wt% to 50wt%; of a copolymer of propylene with from 30.0 wt% to 70.0wt%, of ethylene derived units; the sum of the amount of component A) and B) being 100; the composition having: i) an intrinsic viscosity of the fraction soluble in xylene at 25 °C comprised between 2.2 and 4.0 dl/g; ii) a MFR L (Melt Flow Rate according to ISO 1133, condition L, i.e. 230°C and 2.16 kg load) from 0.5 to 50 g/10 min; iii) a xylene soluble fraction ranging from 20 wt% to 50 wt%; the polypropylene composition being obtained by a two steps polymerization process wherein the catalyst system contains bismuth.
Abstract:
A process for the preparation of polyolefins carried out in the presence of an antistatic composition comprising: a) a compound of formula R-OH wherein R represents hydrogen or a linear or branched, saturated alkyl group having from 1 to 15 carbon atoms; and b) an oligomeric or polymeric organic compound having one or more terminal hydroxyl groups and a viscosity at 40 °C of at least 20 mm 2 /sec (DIN 51562).
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: - the ratio C2wt%/C4wt% is comprised between 0.22 and 3.0, where C2wt% is the weight per cent of ethylene derived units and C4wt% is the weight per cent of 1-butene derived units; - the content of xylene soluble fraction at 25°C is comprised between 2 and 15 wt%; - molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than 4.0; recoverable compliance at 200°C having a maximum value between 800 and 1200 seconds lower than 65x10 -5 Pa -1 .
Abstract:
Process for the preparation of a porous propylene carried out in the presence of a catalyst system comprising (a) a Ziegler-Natta catalyst containing 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 comprising the following steps: i) contacting the catalyst components (a) and (b) for a period of time ranging from 1 to 60 minutes, at a temperature ranging from 35 to 55°C; optionally, ii) pre-polymerizing with one or more olefins of formula CH 2 =CHR, where R is H or a C 1 -C 10 hydrocarbon group, up to forming amounts of polymer from about 0.1 up to about 1000 g per gram of solid catalyst component (a); and iii) polymerizing propylene in the optional presence of minor amounts of ethylene and/or C 4 -C 10 alpha olefins producing said porous propylene (co)polymer.
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 polypropylene composition for injection-moulded drainage systems comprising 78-84 wt% of a crystalline propylene polymer, 8 to less than 13 wt% of an elastomeric copolymer and 8 to less than 13 wt% of polyethylene. The said composition exhibits a flexural modulus value higher than 1400 MPa, a melt flow rate (MFR), determined according to ISO method 1133 (230° C and 2.16 kg), of from 1.5 to 5.0 g/10 min, and a value of Izod impact resistance at 0° C of more than 6 kJ/m2 according to ISO method 180/1 A.
Abstract translation:一种用于注射成型的排水系统的聚丙烯组合物,其包含78-84重量%的结晶丙烯聚合物,8至小于13重量%的弹性体共聚物和8至小于13重量%的聚乙烯。 所述组合物显示高于1400MPa的挠曲模量值,根据ISO方法1133(230℃和2.16kg)测定的熔体流动速率(MFR)为1.5至5.0g / 10min,值为 根据ISO方法180/1 A,0℃下的悬臂梁式冲击强度大于6kJ / m 2。
Abstract:
A process is disclosed for the polymerization of olefins in gas phase carried out in a reactor having two interconnected polymerization zones, a first zone (riser) and a second zone (downcomer), wherein the growing polymer particles: a) flow through the riser under fast fluidization conditions established by feeding a mixture of gas and liquid; b) leave the riser and enter the downcomer, through which they flow downward in a densified form; c) leave the downcomer and are reintroduced into the riser, thus establishing a circulation of polymer between the riser and the downcomer; and wherein the reactor is operated at a temperature which is between 0° C and 5° C above the dew point of the riser gas at the operating pressure, so that in the riser, besides the growing polymer particles and gas flow, an amount of liquid is also present.
Abstract:
A nucleated propylene polymer composition comprising: A) from 77 wt% to 91 wt%, of a propylene homopolymer having a fraction insoluble in xylene at 25 °C higher than 95 %; B) from 9 wt % to 23 wt%, of a copolymer of propylene with from 28.0 wt% to 42.0 wt% of ethylene derived units; the composition having an intrinsic viscosity of the fraction soluble in xylene at 25 °C comprised between 1.0 dl/g and 1.9 dl/g, a fraction soluble in xylene at 25 °C comprised between 9.0 wt% and 21.0 wt%, a total melt flow rate (Melt Flow Rate according to ISO 1133, condition L, i.e. 230°C and 2.16 kg load) comprised between 1.5 and 5 g/10 min and the value of the relation (I): 22.5+0.2*MFR-1.2*Xs+0.2*IV is higher than 5.9; wherein MFR is the melt flow rate of the nucleated composition (Melt Flow Rate according to ISO 1133, condition L, i.e. 230°C and 2.16 kg load); IV is the intrinsic viscosity of the fraction soluble in xylene at 25 °C; and Xs is the fraction soluble in xylene at 25°C; wherein the amount of A+B is equal to 100 wt% and wherein the nucleated agent is selected from the group consisting of aromatic or aliphatic carboxylic acids, aromatic metal phosphates, sorbitol derivatives and talc.
Abstract:
A polypropylene composition comprising: A) from 50 wt% to 90 wt%; of a propylene homopolymer; B) from 10 wt% to 50wt%; of a copolymer of propylene with from 30.0 wt% to 70.0wt%, of ethylene derived units; the sum of the amount of component A) and B) being 100; the composition having: i) an intrinsic viscosity of the fraction soluble in xylene at 25 °C comprised between 2.2 and 4.0 dl/g; ii) a MFR L (Melt Flow Rate according to ISO 1133, condition L, i.e. 230°C and 2.16 kg load) from 0.5 to 100 g/10 min; iii) a xylene soluble fraction ranging from 20 wt% to 50 wt%; the polypropylene composition being obtained by a two steps polymerization process wherein the catalyst system contains bismuth.
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 ), both the amount of propylene units and of the fraction XS A being referred to the weight of (A); (B) 25-50% by weight, of a copolymer of ethylene and a C 3 -C 8 alpha-olefin containing from 0.1% to 15% by weight of alpha-olefin units and containing 75% by weight or less of a fraction soluble in xylene at 25 °C (XS B ), both the amount of ethylene units and of the fraction XS B being referred to the weight of (B); and (C) 30-60% by weight, of a copolymer of ethylene and propylene containing from 45% 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 ), both the amount of ethylene units and of the fraction XS c being referred to the weight of (C).