Abstract: A process for the production of a composition for screening solar radiation which comprises a transparent polymer incorporating an interference pigment comprising a platelet shaped material is disclosed, which process comprises the steps of incorporating the interference pigment into the polymer, and then stretching the resultant polymer in at least one direction to at least twice its original length in that direction. The resultant composition has improved radiation screening properties.

Abstract: Process for heating a polymer-containing stream being transferred from a polymerisation reactor to a degassing vessel, comprising passing the stream through a heater comprising a transfer line for the stream and means for heating the transfer line, wherein the ratio of the stream velocity at the outlet of the heater to that at the inlet, Vo/Vi is at least 1.1, typically between 1.2 and 4.

Abstract: A process comprising polymerizing in a loop reactor an olefin monomer optionally together with an olefin comonomer in the presence of a polymerization catalyst in a diluent to produce a slurry comprising solid particulate olefin polymer and the diluent wherein the Froude number is maintained at or below 20 is disclosed.

Abstract: A polyethylene composition is disclosed having an unpigmented density of at least 946 kg/m3 and a melt index MI5 of 0.05 to 2 g/10 min, and comprising from 48 to 49.5% by weight based on the total weight of the composition of an ethylene polymer fraction (A) having a density of at least 969 kg/m3, and from 50.5 to 52% by weight with based on the total weight of the composition of a copolymer fraction (B) of ethylene and 1-hexene having a melt index MI5 of 0.001 to 0.5 g/10 min and a density of no more than 930 kg/m3.

Abstract: A process comprising polymerising an olefin monomer optionally together with an olefin comonomer in the presence of a polymerisation catalyst in a diluent in a loop reactor which comprises at least 2 horizontal sections and at least 2 vertical sections to produce a slurry comprising solid particulate olefin polymer and the diluent wherein the Froude number in at least 20% of the length of the vertical sections of the reactor loop is less than 85% of the Froude number in at least 20% of the length of the horizontal sections of the loop is disclosed.

Abstract: A process comprising polymerising in a loop reactor an olefin monomer optionally together with an olefin commoner in the presence of a polymerisation catalyst in a diluent to produce a slurry comprising solid particulate olefin polymer and the diluent wherein the Froude number is maintained at or below 20 is disclosed.

Abstract: A process comprising polymerising in a loop reactor of continuous tubular construction an olefin monomer optionally together with an olefin comonomer in the presence of a polymerisation catalyst in a diluent to produce a slurry comprising solid particulate olefin polymer and the diluent wherein the internal diameter of at least 50% of the total length of the reactor is at least 700 millimeters and the solids concentration in the reactor is at least 20 volume % is disclosed.

Abstract: A process comprising polymerizing an olefin monomer optionally together with an olefin comonomer in the presence of a polymerization catalyst in a diluent in a loop reactor which comprises at least 2 horizontal sections and at least 2 vertical sections to produce a slurry comprising solid particulate olefin polymer and the diluent wherein the Froude number in at least 20% of the length of the vertical sections of the reactor loop is less than 85% of the Froude number in at least 20% of the length of the horizontal sections of the loop is disclosed.

Abstract: A screw cap is disclosed comprising a composition based on a multimodal ethylene polymer having a standard density (SD) greater than 950 kg/m3 and a melt flow index MI2 of less than 10 g/10 min, said multimodal ethylene polymer comprising from 35 to 65 wt %, based on the total weight of the multimodal ethylene polymer, of a fraction of ethylene polymer (A) having an SD(A) of more than 965 kg/m3 and a melt flow index MI2(A) of at least 10 g/10 min, and from 65 to 35 wt % based on the total weight of the multimodal ethylene polymer, of a fraction of a copolymer (B) of ethylene and at least one alpha-olefin containing from 3 to 12 carbon atoms, and having a melt flow index MI2(B) of less than 10 g/10 min and a content of said alpha-olefin(s) of from 0.1 to 5 mol %. This composition is said to demonstrate an excellent balance between ESCR, injectability and impact resistance, together with excellent organoleptic properties.

Abstract: A screw cap is disclosed comprising a composition based on a multimodal ethylene polymer having a standard density (SD) greater than 950 kg/m3 and a melt flow index MI2 of less than 10 g/10 min, said multimodal ethylene polymer comprising from 35 to 65 wt %, based on the total weight of the multimodal ethylene polymer, of a fraction of ethylene polymer (A) having an SD(A) of more than 965 kg/m3 and a melt flow index MI2(A) of at least 10 g/10 min, and from 65 to 35 wt % based on the total weight of the multimodal ethylene polymer, of a fraction of a copolymer (B) of ethylene and at least one alpha-olefin containing from 3 to 12 carbon atoms, and having a melt flow index MI2(B) of less than 10 g/10 min and a content of said alpha-olefin(s) of from 0.1 to 5 mol %. This composition is said to demonstrate an excellent balance between ESCR, injectability and impact resistance, together with excellent organoleptic properties.

Abstract: A process for the separation of volatile material from particulate polymer discharged from a polymerisation reactor in the form of a polymer slurry and which has been substantially freed from unreacted monomer in an earlier separation step, comprising (a) feeding the particulate polymer to a purge vessel and causing it to move through the vessel in substantially plug-flow mode, (b) heating the particulate polymer in the purge vessel to a temperature greater than 30° C.

Abstract: A process for the polymerisation of olefins is disclosed wherein at least part of a stream, preferably a catalytically active stream, withdrawn from a polymerisation reactor is passed through a fractionator so as to remove hydrogen and active fines.

Abstract: The invention relates to a polymer of ethylene which has a ?o/?2 ratio of at least 13; and a high load melt index HLMI lower than 8 g /10 min, and a value of tan ? at ?/?c=0.01 of less than 1.3, where ? is G?/G?, ? is the frequency at which G? and G? are measured and we is the frequency at which G?=G?, and G and G? are respectively the elastic modulus and viscous modulus, both measured in Pa at 190° C.; a process for making the polymer using a catalyst comprising chromium supported on a silica-titania support is also described.

Abstract: A process comprising polymerising an olefin monomer optionally together with an olefin comonomer in the presence of a polymerisation catalyst in a diluent in a loop reactor which comprises at least 2 horizontal sections and at least 2 vertical sections to produce a slurry comprising solid particulate olefin polymer and the diluent wherein the Froude number in at least 20% of the length of the vertical sections of the reactor loop is less than 85% of the Froude number in at least 20% of the length of the horizontal sections of the loop is disclosed.

Abstract: A drawn tape, fibre or filament comprising a multimodal resin having a density of at least 940 kg/m3 a melt index MI5 of 0.05 to 5 g/10 min, and a molecular weight distribution of the resin being less than 40.