Frankfurt a., Germany
Frankfurt a., Germany

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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: 2017-01-17

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:


Patent
Basell Polyolefine GmbH | Date: 2017-05-03

An ethylene polymer composition having an eta (0.01) equal to or higher than 35,000 Pa.s, comprising, all per cent amounts being by weight: A) 25-75% of an ethylene polymer selected from ethylene homopolymers, copolymers of ethylene with 10% or less of one or more olefin comonomers, and mixtures of said homopolymers and copolymers; B) 25-75% of a copolymer of ethylene and propylene containing from 45% to 70% of ethylene; wherein eta (0.01) is the complex shear viscosity at an angular frequency of 0.01 rad/s, measured with dynamic oscillatory shear in a plate-plate rotational rheometer at a temperature of 200 C, and the amounts of A) and B) are referred to the total weight of A) + B).


Patent
Basell Polyolefine GmbH | Date: 2017-04-05

Ethylene polymer composition having a fusion enthalpy H fus, measured by Differential Scanning Calorimetry with a heating rate of 20C per minute, of 60 J/g or more, comprising, all per cent amounts being by weight: A) 25-55% of an ethylene polymer containing 10% or less, referred to the weight of A), of a fraction XS A soluble in xylene at 25C; B) 45-75% of a copolymer of ethylene and propylene containing from 45% to 70%, of ethylene and 60% or more of a fraction XS B soluble in xylene at 25C, both ethylene and XS B amounts being referred to the weight of B); wherein the amounts of A) and B) are referred to the total weight of A) + B).


Patent
Basell Polyolefine GmbH | Date: 2017-03-29

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.


Patent
Basell Polyolefine GmbH | Date: 2017-03-08

The present disclosure relates to a continuous process for the preparation of ethylene homopoly- mers or ethylene copolymers comprising polymerizing ethylene or copolymerizing ethylene and one or more other olefins in the presence of a chromium catalyst in a gas-phase polymerization reactor which is equipped with a cycle gas line for withdrawing reactor gas from the reactor, lead- ing the reactor gas through a heat-exchanger for cooling and feeding the reactor gas back to the reactor, wherein the polymerization is carried out at a temperature from 30C to 130C and a pressure of from 0.1 to 10 MPa and an aliphatic carboxylic acid ester having from 8 to 24 carbon atoms is added.


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.


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.


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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