Abstract: The invention relates to a heterophasic alpha-olefÊn random copolymer composition with a melting temperature (Tm) of at least 130° C. and a flexural modulus of not higher than 1000 MPa5 whereby the inventive composition comprises an al-pha-olefin random copolymer component (A) of at least two alpha-olefÊn (co)polymer fractions (i) and (ii) having a different comonomer content, whereby at least one of the fractions is an alpha-olefÊn random copolymer, and a rubber component (B).

Abstract: The invention refers to a process for preparing a Group 2 metal/transition metal olefin polymerisation catalyst component in particulate form having an improved high temperature activity and the use thereof in a process for polymerising olefins.

Abstract: The invention relates to a heterophasic alpha-olefÊn random copolymer composition with a melting temperature (Tm) of at least 130° C. and a flexural modulus of not higher than 1000 MPa5 whereby the inventive composition comprises an al-pha-olefin random copolymer component (A) of at least two alpha-olefÊn (co)polymer fractions (i) and (ii) having a different comonomer content, whereby at least one of the fractions is an alpha-olefÊn random copolymer, and a rubber component (B).

Abstract: The present invention relates to a process for the production of catalysts, particularly of Ziegler-Natta type of catalysts for olefin polymerisation, to the catalysts as such, and to their use in polymerising olefins.

Abstract: A process for producing a Gp 2/transition metal olefin polymerisation catalyst component, in which a Gp 2 complex is reacted with a transition metal compound so as to produce an oil-in-oil emulsion, the disperse phase containing the preponderance of the Gp 2 metal being selectively sorbed on a carrier to provide a catalyst component of excellent morphology. Polymerisation of olefins using a catalyst containing such a component is also disclosed.

Abstract: The invention refers to a process for preparing a Group 2 metal/transition metal olefin polymerisation catalyst component in particulate form having an improved high temperature activity and the use thereof in a process for polymerising olefins.

Abstract: The present invention relates to an antioxidant composition comprising (a) 0.01-0.5% by weight of sterically hindered phenolic compound, (b) 0.01-0.5% by weight of phosphorous compound, and (c) 0.01-1% by weight of sulphurcontaining compound. Said antioxidant composition reduces degradation of plastic materials during processing and end-use and thus, increases the long term thermal stability of those plastic materials. Moreover, this invention relates to methods for producing a final polymeric article with an increased long term thermal stability and stabilization against ageing by radical decomposition processes and polymeric intermediate materials as well as polymeric articles comprising the inventive antioxidant composition.

Abstract: The present invention relates to a process for the production of catalysts, particularly of Ziegler-Natta type of catalysts for olefin polymerisation, to the catalysts as such, and to their use in polymerising olefins.

Abstract: A catalyst having high activity independent of the hydrogen concentration and low gel productivity in the polymerization of ethylene has been prepared.

Abstract: A cable-sheating composition and its use as outer sheath for a power cable or a communication cable are disclosed. The cable-sheating composition is a multimodal, preferably bimodal, mixture of olefin polymers, preferable ethylene plastics, having a density of about 0.915-0.955 g/cm3 and a melt flow rate of about 0.1-0.3 g/10 min, said olefin polymer mixture comprising at least a first and a second olefin polymer, of which the first has a density and a melt flow rate selected from (a) about 0.930-0.975 g/cm3 and about 50-2000 g/10 min and (b) about 0.88-0.93 g/cm3 and about 0.1-0.8 g/10 min.

Abstract: In the polymerization of C3-C12-&agr;-olefins, the activity of the catalyst and the isotacticity and molecular weight of the polymer product can be adjusted and improved in a controlled manner by a new process wherein A) a catalyst system is prepared by bringing a support which comprises magnesium chloride, a derivative thereof or a reagent forming it into contact with at least titanium tetrachloride or a reagent forming it, in order to produce a titanated support; by bringing the titanated support into contact with at least a group 1, 2 or 13 metal compound which contains a C1-C10-alkyl and activates titanium tetrachloride to a catalytically active titanium group, in order to produce an activated support; and by bringing a substance selected from among the said support, titanated support and activated support into contact with at least one donor or a reagent forming it, in order to produce a catalyst system B) polymerization is carried out using the catalyst system by bringing it into contact with at least

Abstract: A multimodal polymer composition for fiber optical cables and a fiber optical cable comprising the composition are disclosed. The composition is characterized in that it comprises a multimodal polyethylene with a density of 0.920-0.965 g/cm3 and a viscosity at a shear stress of 2.7 kPa (&eegr;2.7kPa) of at least 150 kPa.s, said multimodal polyethylene comprising a low molecular weight (LMW) ethylene homo- or copolymer fraction and a high molecular weight (HMW) ethylene copolymer fraction, said multimodal polymer composition having a weight ratio of the LMW fraction to the HMW fraction of (35-55):(65-45). Preferably, the multimodal polyethylene is a bimodal polyethylene and has a shear thinning index (SHI), defined as the ratio of the viscosities at shear stresses of 2.7 and 210 kPa, respectively, of SHI2.7/210=20-150. Also, preferably, the multimodal polyethylene has a MFR5 of 0.1-2.0 g/10 min and a melt strength at 190° C. of at least 4 g.

Abstract: An insulating composition for communication cables (2) is disclosed as well as a telesingle wire (2) which comprises the insulating composition and a telecommunication cable (1) which comprises a plurality of telesingle wires (2) including the insulating composition. The insulating composition comprises a multimodal olefin polymer mixture, obtained by polymerization of at least one &agr;-olefin in more than one stage having a density of about 0.920-0.965 g/cm3, a melt flow rate (MFR2) of about 0.2-5 g/10 min, an FRR21/2≧60, and an environmental stress cracking resistance (ESCR) according to ASTM D 1693 A/10% Igepal, of at least 500 hrs, said olefin polymer mixture comprising at least a first and a second olefin polymer, of which the first is selected from (a) a low molecular weight (MW) olefin polymer with a density of about 0.925-0.975 g/cm3 and a melt flow rate (MFR2) of about 300-20 000 g/10 min, and (b) a high molecular weight (MW) olefin polymer with a density of about 0.880-0.

Abstract: The invention relates to polyethylene compositions containing 85-99.5 weight % of component A, which is a linear (co)polymer of ethylene having a bimodal weight distribution, and 0.5-15 weight % of component B having a unimodal molecular weight distribution. Component A is 40-60% by weight of a low molecular weight component (A1) having a weight average molecular weight between 5,000 and 50,000 g/mol, and a molecular weight distribution Mw/Mn between 2.5 and 9 and 60-40% by weight of a high molecular weight component (A2) having a weight average molecular weight between 300,000 and 900,000 g/mol, and a molecular weight distribution M/w/Mn between 4.5 and 12. Component B is a linear ethylene polymer having a molecular weight between 150,000-600,O00 g/mol and an average molecular weight which is higher than the average molecular weight of component (A1) but lower than the average molecular weight of component (A2) and a density controlled within the range of 910-960 kg/m.sup.3.

Abstract: Ethene having a profitable .alpha.-olefin distribution and an .alpha.-olefin copolymer have been prepared with a process comprising reacting of at least the following components with each other:a) a procatalyst comprising a halogen compound of a transition metal in any of groups 4 to 8 of the periodic table of elements,b) a cocatalyst comprising an organohalogenous compound of a metal in group 2 or 3 of the periodic table of elements,c) ethene andd) one or more .alpha.-olefins copolymerizing with ethene, being characterised in that the organohalogenous compound of the metal in group 2 or 3 is prepared by reacting the organic compound of the metal in group 2 or 3 and a catalytically non-toxic halogen compound during copolymerization, or not earlier than 3 hours before copolymerization.

Abstract: A method and apparatus for taking a sample from a flowing suspension formed by polymer particles and hydrocarbon diluent in a olefin polymerization process including at least one filter situated at a plane of an inside surface of a transfer conduit between reactors. Each filter includes perforations or pores having a size to prevent substantially any of the catalyst used in the polymerization process from passing through the filter, e.g., smaller than the smallest particle size of a catalyst used in the polymerization process. The pore or perforation size of each filter is preferably 0.1-10 .mu.m, preferably between 0.2-1 .mu.m. A pressure difference permits at least partial vaporization of the sample as it passes through the filter.

Abstract: The invention relates to a process for the preparation of a high activity procatalyst for the production of ethylene polymers. The process according to the present invention comprises the following steps:(a) contacting the inorganic support with an alkyl metal chloride which is soluble in non-polar hydrocarbon solvents, and has the formula(R.sub.n MeCl.sub.3-n).sub.m (1)wherein R is a C.sub.1 -C.sub.20 aklyl group, Me is a metal of group III(13) of the periodic table, n=1 or 2 and m=1 or 2, to give a first reaction product,(b) contacting said first reaction product with a compound or mixture containing hydrocarbyl and hydrocarbyl oxide linked to magnesium which is soluble in non-polar hydrocarbon solvents, to give a second reaction product, and(c) contacting said second reaction product with a titanium compound which contains chlorine, having the formulaCl.sub.x Ti(OR.sup.IV).sub.4-x (2)wherein R.sup.IV is a C.sub.2 -C.sub.20 hydrocarbyl group and x is 3 or 4, to give said procatalyst.

Abstract: A method of compounding a multimodal, preferably a bimodal polymer composition comprising a low molecular weight ethylene polymer and a high molecular weight ethylene polymer is described. The composition is compounded during a relatively long time at a low temperature which lies in a narrow temperature range including the melting point of the low molecular weight ethylene polymer. More particularly, the polymer composition is compounded, without addition of a beat transfer medium, in a temperature range from about 10.degree. C. below to about 10.degree. C. above the melting point of the low molecular weight ethylene polymer during a time of more than 10 seconds. The viscosity ratio between the ethylene polymers in said temperature range preferably is from about 5:1 to about 1:5.

Abstract: The invention relates to a method for preventing fouling in polymerization reactors, in particular in loop reactors, in which alpha-olefins are polymerized or copolymerized in particle form in the presence of catalysts. A mixture of alpha-olefin-acrylonitrile copolymers and polymeric polyamines is added into a reactor in order to prevent the fouling of the reactor.

Abstract: The invention relates to a procatalyst for the production of ethylene polymers, which procatalyst comprises an inorganic support, a chlorine compound carried on said support, a magnesium compound carried on said support, a titanium compound carried on said support, whereby the chlorine compound can be different from or the same as the magnesium compound and/or the titanium compound. The activity balance AB of the procatalyst in specified polymerization conditions, isAB>3.2wherein AB=?(A+A'):2!.multidot.?log (MFR.sub.2 ':MFR.sub.2):(A-A')!, A means polymerization activity expressed an kg PE/g cat .multidot.h, MFR.sub.2 means the melt flow rate in g/min units at a load of 2,16 kg, according to the standard ISO 1133, the absence of the upper index ' means low melt flow rate polymerization and the presence of the upper index ' means high melt flow polymerization. This means that the catalyst activity is relatively independent of the presence of chain transfer agents.