Abstract: A polyethylene composition is disclosed which comprises from 45 to 55 wt % of an ethylene polymer (A) having a density of at least 968 kg/m3, and from 55 to 45 wt % of an ethylene polymer (B) having a density of 920 to 955 kg/m3, wherein the composition has a density of 952 to 961 kg/m3, a high load melt index HLMI of 18-28 g/10 min, a ratio of HLMI/ML of 80-150, and a melt elastic modulus G? (G?=3000) of 1200-1600 Pa, where HLMI and ML2 are measured according to ISO1133 at a temperature of 190° C. under loads of 21.6 kg and 2.16 kg respectively.

Abstract: A polyethylene composition is disclosed which comprises from 45 to 55 wt % of an ethylene polymer (A) having a density of at least 968 kg/m3, and from 55 to 45 wt % of an ethylene polymer (B) having a density of 920 to 955 kg/m3, wherein the composition has a density of 952 to 961 kg/m3, a high load melt index HLMI of 18-28 g/10 min, a ratio of HLMI/ML of 80-150, and a melt elastic modulus G? (G?=3000) of 1200-1600 Pa, where HLMI and ML2 are measured according to ISO1133 at a temperature of 190° C. under loads of 21.6 kg and 2.16 kg respectively.

Abstract: A composition suitable for use in pressure pipes and pipe fittings is disclosed comprising polymer of ethylene and from 0.5 to 5 wt % of a C4-C8 alpha-olefin which has a natural density of 935-956 kg/m3, a melt index MI5 of 0.15-0.5 g/10 min, a dynamic complex viscosity at 100 rad/s and 190° C. (?100) of no more than 2500 Pa·s, a relationship between ?100 and dynamic complex viscosity measured in Pa·s at 0.01 rad/s and 190° C. (?0.01) defined by the equation ?0.01>115000+30. ?100, and an environmental stress crack resistance as measured by a notched pipe test performed according to ISO13479:1997 on 110 mm SDR 11 pipes at 80° C. and a pressure of 9.2 bar, of greater than 1000 hours, or: wherein the C4-C8 alpha-olefin is 1-hexene or 1-octene.

Abstract: A polyethylene resin comprising from 44 to 55 wt % of a high molecular weight polyethylene fraction, and from 45 to 56 wt % of a low molecular weight polyethylene fraction; the high molecular weight polyethylene fraction comprising a linear low density polyethylene having a density of from 0.913 to 0.923 g/cm3, and an HLMI of from 0.02 to 0.2 g/10 min; and the low molecular weight polyethylene fraction comprising a high density polyethylene having a density of at least 0.969 g/cm3 and an MI2 of greater than 100 g/10 min; wherein the relationship between the density D of the resin in g/cm3 and the weight fraction of the low molecular weight fraction P1 is defined by 0.055P1+0.916<D<0.034P1+0.937.

Abstract: A composition suitable for use in pressure pipes and pipe fittings is disclosed comprising polymer of ethylene and from 0.5 to 5 wt % of a C4-C8 alpha-olefin which has a natural density of 935-956 kg/m3, a melt index MI5 of 0.15-0.5 g/10 min, a dynamic complex viscosity at 100 rad/s and 190° C. (?100) of no more than 2500 Pa·s, a relationship between ?100 and dynamic complex viscosity measured in Pa·s at 0.01 rad/s and 190° C. (?0.01) defined by the equation ?0.01>115000+30. ?100, and an environmental stress crack resistance as measured by a notched pipe test performed according to ISO13479:1997 on 110 mm SDR 11 pipes at 80° C. and a pressure of 9.2 bar, of greater than 1000 hours, or: wherein the C4-C8 alpha-olefin is 1-hexene or 1-octene.

Abstract: A polyethylene resin comprising from 44 to 55 wt % of a high molecular weight polyethylene fraction, and from 45 to 56 wt % of a low molecular weight polyethylene fraction; the high molecular weight polyethylene fraction comprising a linear low density polyethylene having a density of from 0.913 to 0.923 g/cm3, and an HLMI of from 0.02 to 0.2 g/10 min; and the low molecular weight polyethylene fraction comprising a high density polyethylene having a density of at least 0.969 g/cm3 and an MI2 of greater than 100 g/10 min; wherein the relationship between the density D of the resin in g/cm3 and the weight fraction of the low molecular weight fraction P1 is defined by 0.055P1+0.916<D<0.034P1+0.937.

Abstract: An ethylene polymer composition having a density of at least 950 kg/m3, a fluidity index MI5 of 0.05 to 2 g/10 min and a content of alpha-olefin containing from 4 to 10 carbon atoms of from 0.15 to 1 mole %, containing from 53 to 63% by weight based on the total weight of the composition of an ethylene polymer fraction (A) having a fluidity index MI2 of at least 100 g/10 min a density of at least 969 kg/m3 and a molecular weight distribution Mw/Mn greater than 4, and from 37 to 47% by weight based on the total weight of the composition of a copolymer fraction (B) of ethylene and from 0.32 to 2.7 mole % of at least one alpha-olefin containing from 4 to 10 carbon atoms, a fluidity index MI5 to 0.001 to 0.5 g/10 min, a density of no more than 930 kg/m3 and a molecular weight distribution Mw/Mn greater than 4, wherein the ratio of the MI2 of fraction (A) to the MI5 of fraction (B) is greater than 20,000.

Abstract: A polyethylene resin comprising a blend of from 35 to 49 wt % of a first polyethylene fraction of high molecular weight and 51 to 65 wt % of a second polyethylene fraction of low molecular weight, the first polyethylene fraction comprising a linear low density polyethylene having a density of up to 0.928 g/cm3, and an HLMI of less than 0.6 g/10 min and the second polyethylene fraction comprising a high density polyethylene having a density of at least 0.969 g/cm3, and an MI2 of greater than 100 g/10 min, and the polyethylene resin, having a density of greater than 0.951 g/cm3 and an HLMI of from 1 to 100 g/10 min.

Abstract: A fuel tank for a vehicle is disclosed, comprising at least one component which is blow-moulded multimodal poly-ethylene having a polydispersity Mw/Mn of at least 4, formed of at least two blocks, each having a polydispersity Mw/Mn of less than 4.

Abstract: A polyethylene resin comprising from 44 to 55 wt % of a high molecular weight polyethylene fraction, and from 45 to 56 wt % of a low molecular weight polyethylene fraction; the high molecular weight polyethylene fraction comprising a linear low density polyethylene having a density of from 0.913 to 0.923 g/cm3, and an HLMI of from 0.02 to 0.2 g/10 min; and the low molecular weight polyethylene fraction comprising a high density polyethylene having a density of at least 0.969 g/cm3 and an MI2 of greater than 100 g/10 min; wherein the relationship between the density D of the resin in g/cm3 and the weight fraction of the low molecular weight fraction P1 is defined by 0.055P1+0.916<D<0.034P1+0.937.

Abstract: A polyethylene resin comprising from 35 to 49 wt. % of a first polyethylene fraction of high molecular weight and from 51 to 65 wt. % of a second polyethylene fraction of low molecular weight, the first polyethylene having a density of up to 0.930 g/cm3, and an HLMI of less than 0.6 g/10 min and the second polyethylene fraction comprising a high density polyethylene having a density of at least 0.969 g/cm3 and an MI2 of greater than 10 g/10 min, and the polyethylene resin, having a density of great 0.946 g/cm3, an HLMI of from 1 to 100 g/10 min, a dynamical viscosity, measured at 0.01 radians/second, greater than 200,000 Pa.s and a ratio of the dynamical viscosities measured at, respectively 0.01 and 1 radians/second greater than 8.

Abstract: A fuel tank for a vehicle is disclosed, comprising at least one component which is injection-moulded multimodal polyethylene resin having a polydispersity Mw/Mn of at least 3. Preferably the polyethylene resin is bimoldal and the injection-moulded component forms one or more of the walls of the tank.

Abstract: A composition is disclosed having a density of at least 950 kg/m3, a fluidity index MI5 of 0.05 to 2 g/10 min and a content of alpha-olefin containing from 4 to 10 carbon atoms of from 0.15 to 1 mole %, comprising:—from 53 to 63% by weight based on the total weight of the composition of an ethylene polymer fraction (A) having a fluidity index MI2 of at least 100 g/10 min, a density of at least 969 kg/m3 and a molecular weight distribution Mw/Mn greater than 4, and −37 to 47% by weight with based on the total weight of the composition of a copolymer fraction (B) of ethylene and from 0.32 to 2.7 mole % of at least one alpha-olefin containing from 4 to 10 carbon atoms, a fluidity index MI5 Of 0.001 to 0.5 g/10 min, a density of no more than 930 kg/m3 and a molecular weight distribution Mw/Mn, greater than 4,—wherein the ratio of the MI2 of fraction (A) to the MI5 of fraction (B) is greater than 2000.

Abstract: A polyethylene resin comprising a blend of from 35 to 49 wt % of a first polyethylene fraction of high molecular weight and 51 to 65 wt % of a second polyethylene fraction of low molecular weight, the first polyethylene fraction comprising a linear low density polyethylene having a density of up to 0.928 g/cm3, and an HLMI of less than 0.6 g/10 min and the second polyethylene fraction comprising a high density polyethylene having a density of at least 0.969 g/cm3, and an MI2 of greater than 100 g/10 min, and the polyethylene resin, having a density of greater than 0.951 g/cm3 and an HLMI of from 1 to 100 g/10 min.

Abstract: A polyethylene resin comprising from 35 to 49 wt. % of a first polyethylene fraction of high molecular weight and from 51 to 65 wt. % of a second polyethylene fraction of low molecular weight, the first polyethylene having a density of up to 0.930 g/cm3, and an HLMI of less than 0.6 g/10 min and the second polyethylene fraction comprising a high density polyethylene having a density of at least 0.969 g/cm3 and an MI2 of greater than 10 g/10 min, and the polyethylene resin, having a density of greater than 0.946 g/cm3, an HLMI of from 1 to 100 g/10 min, a dynamical viscosity, measured at 0.01 radians/second, greater than 200,000 Pa.s and a ratio of the dynamical viscosities measured at, respectively 0.01 and 1 radians/second greater than 8.

Abstract: The invention concerns a method for producing ethylene homopolymers or copolymers comprising at least 90 mol % of units derived from ethylene which consists in: contacting in polymerising conditions, the monomers with a catalytic system including: (a) a catalytic solid comprising a metallocene of a transition metal of groups 4 to 6 of the periodic table containing at least a cyclopentadiene ligand capable of being substituted and a support, (b) at least an organoaluminium compound selected among compounds of general formula (1): AlTx(Y′)yX′z wherein: T is a hydrocarbon group containing 1 to 30 carbon atoms; Y′ is a group selected among —OR′, —SR′ and NR′R″ with R′ and R″ independently representing a hydrocarbon group containing 1 to 30 carbons atoms; X′ is a halogen atom: x verifies the relationship 0<x≦3; y verifies the relationship 0≦y<3; z verifies the relationship 0≦2<3, and x+y+z=3, and (c) at least

Abstract: The invention concerns a method for producing ethylene homopolymers or copolymers comprising at least 90 mol % of units derived from ethylene which consists in: contacting in polymerising conditions, the monomers with a catalytic system including: (a) a catalytic solid comprising a metallocene of a transition metal of groups 4 to 6 of the periodic table containing at least a cyclopentadiene ligand capable of being substituted and a support, (b) at least an organoaluminium compound selected among compounds of general formula (1): AITx(Y′)yX′z wherein: T is a hydrocarbon group containing 1 to 30 carbon atoms; Y′ is a group selected among —OR′, —SR′ and NR′R″ with R′ and R″ independently representing a hydrocarbon group containing 1 to 30 carbon atoms; X′ is a halogen atom: x verifies the relationship 0<x≦3; y verifies the relationship 0≦y<3; z verifies the relationship 0≦z<3, and x+y+z=3, and (c) at least

Abstract: Process for polymerizing alpha-olefins, in which at least one alpha-olefin is placed in contact, under polymerizing conditions, with a catalytic system comprising

Abstract: Process for polymerizing alpha-olefins, in which at least one alpha-olefin is placed in contact, under polymerizing conditions, with a catalytic system comprising (a) a solid catalyst comprising (i) a compound of a transition metal from groups 4 to 6 of the Periodic Table, containing at least one cyclopentadiene ligand which may be substituted, (ii) an activator chosen from aluminoxanes and ionizing agents, and (iii) a porous polymeric support, and (b) at least one organoaluminium compound corresponding to the general formula R3−nAl(Y′)n in which 0.

Abstract: Asymmetric silicon-bridged metallocenes represented by the general formula: wherein M represents a transition metal selected from Ti, Zr and Hf. X and X′ represent a halogen atom, R1, R2, R3 represent alkyl groups containing 1 or 2 carbon atoms or hydrogen atoms, providing that at least two of R1, R2, R3 are alkyl groups, and R4 and R5 represent alkyl or aryl group containing from 1 to 10 carbon atoms. A process for their preparation and polymerization of olefins in the presence of the asymmetric silicon-bridged metallocenes are disclosed.