Borealis

A multistage ethylene polymerisation process for producing ethylene copolymers is described. The process comprises:a) polymerising ethylene in the presence of a solid Ziegler-Natta catalyst component comprising titanium, and a co-catalyst in a first polymerisation stage to produce a first polymer component;b) polymerising ethylene in the presence of the solid Ziegler-Natta catalyst component, the cocatalyst and the first polymer component in a second polymerisation stage to produce a second polymer component;wherein ethylene is polymerised with an alpha-olefin comonomer having from 3 to 10 carbon atoms in the first polymerisation stage and/or the second polymerisation stage; andwherein the first polymerisation stage and/or the second polymerisation stage takes place in the presence of an external donor selected from bi-(oxygen containing ring) compounds of formula (I):in which:n is independently at each occurrence an integer selected from 1 and 2;m is independently at each occurrence an integer selected from 0 and 1;each of R^1a, R^1b, R^2a, R^2b, R^3a, R^3b, R^4a, R^4b, R^5a and R^5b is independently selected from hydrogen, linear or branched C₁ to Cs alkyl, C₃ to Cs alkylene, or wherein two or more of R^1a, R^1b, R^2a, R^2b, R^3a, R^3b, R^4a, R^4b, R^5a and R^5b can form a ring;wherein the two oxygen-containing rings can be individually saturated, partially unsaturated or unsaturated

The present invention relates to a polypropylene composition comprising a heterophasic propylene-ethylene copolymer having a melt flow rate MFR<2> in the range of from 50 to 250 g/10 min, a mixed plastics polypropylene blend originating from post-consumer waste and/or post-industrial waste and having a melt flow rate MFR<2>, in the range of from 10 to 50 g/10 min, an elastomer of ethylene and one or more alpha-olefin comonomer(s) having from 4 to 10 carbon atoms, having a melt temperature of from 100 to 135°C, and a glass transition temperature Tg of from -45 to -75°C,, an inorganic filler and additives, an article comprising said polypropylene composition and the use of said polypropylene composition for injection molding of articles.

The invention concerns a solution polymerization process for producing an ethylene-1-butene copolymer, the process comprising the steps of a) feeding ethylene, 1-butene, a metallocene catalyst system and a solvent into a first reactor, b) polymerizing in the first reactor ethylene and 1-butene in the presence of the metallocene catalyst system and the solvent at a pressure of from 50 to 300 bar and a temperature of from 95 to 135 °C to form the ethylene-1-butene copolymer, wherein the metallocene catalyst system comprises, or consists of, (i) a metallocene complex of formula (I), <img class="EMIRef" id="35359059-d4ab-4a24-bcca-769fb6cff1c9-ia01" /> wherein M is Hafnium, R are the same or different from each other and can be a saturated linear or branched C<1> to C<10> alkyl, preferably all R are the same and are a linear or branched C<1> to C<3> alkyl, more preferably all R are a C<1> alkyl group, R<1> is an unsubstituted C<6> to C<10> aryl, preferably phenyl and R<2> is a C<4> to C<20> cycloalkyl group or a C<4> to C<6> alkenyl groups, X is a C<1> to C<6> alkyl, preferably methyl, and (ii) a cocatalyst. c) withdrawing the ethylene-1-butene copolymer from the first reactor, characterized in that the ethylene-1-butene copolymer has a melt flow rate MFR<2>, measured according to ISO1133 at 190 °C and a load of 2.16 kg, in the range of from 0.1 to 990 g/10 m in or in the range of from 47 to 990 g/10 min.

The invention relates to a polyolefin composition comprising a heterophasic polypropylene copolymer (HECO), wherein the heterophasic polypropylene copolymer comprises a matrix (M) being a propylene homopolymer (PPH) and an elastomeric propylene copolymer (EPC) dispersed in said matrix (M), having the following properties: a total ethylene (C2) content, as determined according to CRYSTEX QC analysis , in the range from 0.5 to less than 7.0 wt.-% (based on the total weight of the heterophasic propylene copolymer) combined with a melting Temperature T<m> (as determined by DSC analysis according to ISO 11357) in a range from 145°C to 162°C, and stress-whitening (SW) intensity lower than 3.5 (as determined according to the method described in the experimental section).

The present invention relates to a process for producing a heterophasic propylene-ethylene copolymer via visbreaking using specific peroxide radical initiators, to certain heterophasic propylene-ethylene copolymers defined by a storage modulus ratio (G'₀₀₃)/(G'₀₀₁), and to films comprising said heterophasic propylene-ethylene copolymers.

The present invention relates to a power cable comprising a conductor, an inner semiconductive layer, an insulation layer and an outer semiconductive layer, obtainable by a process comprising the steps of a) preparing a semiconductive polypropylene composition (S-PP), which comprises a first heterophasic copolymer of propylene and ethylene (HECO1), carbon black and a dielectric fluid comprising at least one alkylaryl hydrocarbon, b) preparing a polypropylene composition (I-PP), which comprises a second heterophasic copolymer of propylene and ethylene (HECO2) and is free of a dielectric fluid, c) coating the conductor with an inner semiconductive layer comprising the semiconductive polypropylene composition (S-PP); d) coating the inner semiconductive layer with an insulation layer comprising the polypropylene composition (I-PP), and e) coating the insulation layer with an outer semiconductive layer comprising the semiconductive polypropylene composition (S-PP),a process for producing the power cable, andthe use of the dielectric fluid comprising at least one alkylaryl hydrocarbon in the semiconductive composition (S-PP) for increasing the Weibull alpha-value of the power cable to a value of at least 35 kV/mm.

The present invention relates to a power cable comprising a conductor, an inner semiconductive layer, an insulation layer and an outer semiconductive layer, obtainable by a process comprising the steps of a) preparing a semiconductive polypropylene composition (S-PP), which comprises a first heterophasic copolymer of propylene and ethylene (HECO1), carbon black and a wax of copolymer propylene and ethylene, b) preparing a polypropylene composition (I-PP), which comprises a second heterophasic copolymer of propylene and ethylene (HECO2) and is free of a dielectric fluid, c) coating the conductor with an inner semiconductive layer comprising the semiconductive polypropylene composition (S-PP); d) coating the inner semiconductive layer with an insulation layer comprising the polypropylene composition (I-PP), and e) coating the insulation layer with an outer semiconductive layer comprising the semiconductive polypropylene composition (S-PP),a process for producing the power cable, andthe use of a wax of a copolymer of propylene and ethylene in the semiconductive composition (S-PP) for increasing the Weibull alpha-value of the power cable to a value of at least 35 kV/mm.

The present invention relates to a method for providing a recycled plastics extrudate RE with a desired color value and color distribution from recycled plastics flakes RF comprising the following steps: providing a stream of recycled mixed-color plastics flakes RF, measuring the color values of at least a part of the stream of the recycled mixed-color plastics flakes RF and determining the color distribution from the measured color values, predicting the color values of the recycled plastics extrudate RE based on the measured color values of the recycled mixed-color plastics flakes RF by applying a color prediction tool CPT, pre-adjusting the color values of the recycled mixed-color plastics flakes RF by changing the color composition of the recycled mixed-color plastics flakes RF to meet the desired color values of the recycled plastics extrudate RE by removing at least one color fraction of the recycled mixed-color plastics flakes RF in at least one sorting unit from at least a part of the stream of the recycled mixed-color plastics flakes RF and/or by adding at least one color fraction of plastics flakes to the recycled mixed-color plastics flakes RF during homogenization; homogenizing the color pre-adjusted recycled mixed-color plastics flakes RF; and extruding the color pre-adjusted recycled plastics flakes RF to obtain the recycled plastics extrudate RE with the desired color values while measuring the final color of the recycled plastics extrudate RE.

The present invention relates to a high density polyethylene composition, comprising (A) from 60 to 97 wt.-%, based on the total weight of the high density polyethylene composition, of a high density multimodal polyethylene copolymer having a polymer density of at least 950 kg/m³ and a MFR₅ determined according to ISO 1133 (190 °C, 5 kg) of not more than 0.50 g/10 min, and (B) from 3 to 40 wt.-%, based on the total weight of the high density polyethylene composition, of an ultra-high molecular weight polyethylene homopolymer having a nominal viscosity molecular weight Mv of 2,000,000 to 5,000,000 g/mol different from component (A); and wherein said high density multimodal polyethylene copolymer (A) comprises a copolymer of ethylene with at least one alpha olefin comonomer having from 4 to 12 carbon atoms, and said high density polyethylene composition has an MFR₂₁ of 3.0 g/10 min or less and a density of at least 958 kg/m³ including pigments, if present. The invention further relates to a process for the preparation of the above high density polyethylene composition and to an article, preferably a pipe or a pipe fitting comprising the high density polyethylene composition.

The present invention relates to a polyolefin blend with a good balance between stiffness and toughness. The polyolefin blend has (i) a melt flow rate MFR<2> (ISO 1133, 230 °C, 2.16 kg) in the range of from 1.0 to 20.0 g/10 min; and (ii) a Charpy Notched Impact Strength (ISO 179-1eA, 23 °C) of more than 4.0 kJ/m<2>; and it comprises (A) 80 to 98 wt.-% of a recycled polyethylene-polypropylene composition (A) with specific characteristics; and (B) 2 to 20 wt.-% of a specifically selected polypropylene (B). The present invention further relates to a method of preparing the polyolefin blend, an article comprising the same and the use of the polyolefin blend in automotive and/or packaging applications. Still further, the present invention is directed to the use of the polypropylene (B) for improving the balance between stiffness and toughness of a recycled polyethylene-polypropylene composition (A) by blending both components.