Frankfurt a., Germany
Frankfurt a., Germany

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Patent
Basell Polyolefine GmbH | Date: 2015-05-13

A slurry polymerization process comprising polymerizing monomers in a reactor comprising baffles, a first slurry feed line for returning cooled slurry from a cooler and optionally a second slurry feed line for transferring reactor slurry from a previous reactor of a cascade of polymerization reactors, wherein the baffle top, the first slurry feed line discharge end and the second slurry feed line end are located below the reactor liquid level.


A process for polymerizing or copolymerizing ethylenically unsaturated monomers in the presence of free-radical polymerization initiators, wherein the polymerization is carried out in a continuously operated tubular reactor at temperatures from 100C to 350C and pressures in the range from 180 MPa to 340 MPa with a specific reactor surface area A_(sp) of 2 m^(2)/(t/h) to 5.5 m^(2)/(t/h) and the tubular reactor has a specific ratio RD_(sp) of from 0.0050 MPa^(-1) to 0.0069 MPa^(-1) and an inner surface which has a surface roughness Ra of 2 m or less.


Patent
Basell Polyolefine GmbH | Date: 2016-07-20

The present disclosure relates to a polyethylene composition with improved swell ratio and mechanical properties for use in preparing blow-moulded articles and having the following features:


The invention relates to a polyethylene molding composition having a multimodal molar mass distribution particularly suitable for blow molding films having a thickness in the range from 8 to 200 m. The molding composition has a density at a temperature of 23 C. in the range from 0.953 to 0.960 g/cm^(3 )and an MFR_(190/5 )of the final product after extrusion in the range from 0.10 to 0.50 dg/min. The composition comprises from 30 to 60% by weight of a first ethylene polymer fraction made of a homopolymer A having a first molecular weight, from 22 to 40% by weight of a second ethylene polymer fraction made of a further homopolymer or first copolymer B of ethylene and at least one first comonomer from the group of olefins having from 4 to 8 carbon atoms, the first copolymer B having a second molecular weight higher than the first molecular weight, and from 10 to 30% by weight of a third ethylene polymer fraction made of a second copolymer C having a third molecular weight higher than the second molecular weight. The molding composition of the invention allows to produce thin films having improved processability without impairing the mechanical properties.


Patent
Basell Polyolefine GmbH | Date: 2014-09-24

The present disclosure relates to a polyethylene composition comprising copolymers of ethylene with 1-alkenes, or mixtures of ethylene homopolymers and said copolymers of ethylene with 1-alkenes, wherein the polyethylene composition has a molar mass distribution width (MWD) M_(w)/M_(n )of from 7 to 15, a density of from 0.942 to 0.954 g/cm^(3), a weight average molar mass M_(w )of from 20,000 g/mol to 500,000 g/mol, a MIE of from 1.0 to 3.0 g/10 min, a MIF of from 100 to 200 g/10 min, and a ratio MIF/MIE of from 40 to 50.


Patent
Basell Polyolefine GmbH | Date: 2014-02-04

A multilayer fiber ABA comprising:


Patent
Basell Polyolefine GmbH | Date: 2014-06-04

Polyethylene composition with improved swell ratio and mechanical properties, particularly suited for preparing blow-moulded articles, said composition having the following features:1) density from 0.945 to less than 0.952 g/cm^(3);2) ratio MIF/MIP from 15 to 30;3) Shear-Induced Crystallization Index SIC from 2.5 to 5.5.


The present technology relates to a process for polymerizing or copolymerizing ethylenically unsaturated monomers in the presence of free-radical polymerization initiators, wherein the polymerization is carried out in a continuously operated tubular reactor at temperatures from 100 C. to 350 C. and pressures from 180 MPa to 340 MPa, with a specific reactor surface area A_(sp )of 2 m^(2)/(t/h) to 5.5 m^(2)/(t/h), and the tubular reactor has a specific ratio RD_(sp )of 0.0050 MPa^(1 )to 0.0069 MPa^(1 )and an inner surface which has a surface roughness Ra of 2 m or less.


Process for preparing a polyolefin polymer comprising the steps ofa) forming a particulate polyolefin polymer by polymerizing one or more olefins in the presence of a polymerization catalyst system in a polymerization reactor;b) discharging the formed polyolefin particles from the polymerization reactor;c) degassing the polyolefin particles by a process comprising at least a final step of contacting the polyolefin particles with a nitrogen stream in a degassing vessel; andd) transferring the polyolefin particles from the vessel, in which the contacting of the polyolefin particles with the nitrogen stream is carried out, to a melt mixing device, in which the polyolefin particles are melted, mixed and thereafter pelletized, without passing the particles through a buffering device,wherein the degassing vessel is only partly filled with polyolefin particles and the empty volume within the degassing vessel is sufficient to take up additional polyolefin particles for at least 3 hours if the transfer of polyolefin particles of step d) from the degassing vessel to the melt mixing device is discontinued and the discharge of polyolefin particles from the polymerization reactor according to step b) is continued with unchanged rate.


Patent
Basell Polyolefine GmbH | Date: 2016-04-27

The present disclosure relates to a polyethylene composition with improved swell ratio and mechanical properties, particularly suited for preparing blow-moulded articles, said composition having the following features:

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