Abstract:
A polyolefin composition comprising: A) from 85.0 wt% to 99.5 wt%; of a propylene 1-hexene copolymer B) from 0.5 wt% to 15.0 wt%; of a propylene, ethylene copolymer composition comprising: b1) from 12 wt% to 52 wt%; of a propylene homopolymer or a propylene/ethylene copolymer b2) from 48 wt% to 88 wt% of a propylene ethylene copolymer having a content of ethylene derived units ranging from 15.0 wt% to wt% to 42.0 wt%; wherein the resulting polyolefin composition has an melt flow rate (230°C/5 kg.. ISO 1133) ranging from 0.2 g/lOmin to 4.0 g/10min; the sum A+B being 100 and the sum b1+b2 being 100.
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 consumable filament for use in an extrusion-based additive manufacturing system comprising a propylene ethylene copolymer having: - ethylene derived units content ranging from 3.0 wt% to 12.0 wt%; - MFR L (Melt Flow Rate according to ISO 1133, condition L, i.e. 230°C and 2.16 kg load) from 4 to 20 g/10 min; and - xylene solubles measured at 25°C comprised between 3 wt% and 30 wt%.
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 gas-phase process for the homo or copolymerization of propylene with other olefins, carried out in the presence of a catalyst system comprising: (a) a solid catalyst component comprising Mg, Ti, halogen, an electron donor selected from 1.3-diethers and an olefin polymer in a specific amount; (b) an aluminum alkyl compound and (c) an external electron donor compound selected from specific classes; said components (a) and (c) being employed in amounts such that the Al/(ED) molar ratio ranges from 2 to 200. The process is capable to give polypropylene product having good morphological properties, high stereoregularity, and capable to show self- extinguishing properties such that the negative effects caused by the fine catalyst particle polymerization can be selectively solved or mitigated.
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:
A solid catalyst component for the polymerization of olefins comprising Mg, Ti, halogen and an electron donor of formula (I) or (II) When activated with an aluminum alkyl and optionally an external electron donor is capable to give high activity and stereo specificity in the polymerization of olefins.
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:
A propylene ethylene copolymer characterized by the following features: ethylene content of between 1.8 and 10.0% by weight; molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than 4.0; the content of xylene soluble fraction (XS) and ethylene content (C2) fulfill the following relation: XS
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.