Basell Polyolefine GmbH

Frankfurt a., Germany

Basell Polyolefine GmbH

Frankfurt a., Germany
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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: 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.


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: 2017-05-03

A process for the preparation of polyethylene by polymerizing in a slurry ethylene and optionally one or more C3 to C10 alpha-olefins in a reactor system comprising a polymerization reactor and one or more first heat exchangers located outside the polymerization reactor where the slurry in the polymerization reactor is cooled by withdrawing slurry from the polymerization reactor, cooling the slurry in the one or more first heat exchangers and returning the cooled slurry to the polymerization reactor, wherein the one or more first heat exchangers are cooled by a first coolant having a temperature of 29C or higher.


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

A slurry polymerization process for the preparation of polyethylene in the presence of a Ziegler catalyst and aluminum alkyl in at least one polymerization reactor, in which process suspension medium comprising a concentration of aluminum alkyl is recycled to the polymerization, the concentration of aluminum alkyl in the recycled suspension medium is determined; and the amount of fresh aluminum alkyl fed to the polymerization is adjusted to maintain a targeted aluminum alkyl concentration in the recycled suspension medium.


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

A method for controlling a slurry polymerization for the preparation of polyethylene, where the polyethylene is formed in a polymerization reactor comprising a vapor section by contacting a Ziegler-type catalyst, ethylene, and either hydrogen or, as comonomer(s), one or more C3 to C10 alpha-olefins or hydrogen and one or more C3 to C10 alpha-olefins, wherein the ethylene partial pressure is maintained by adjusting the flow rate of the catalyst to the polymerization reactor and the hydrogen/ethylene and comonomer/ethylene partial pressure ratios are maintained by adjusting the flow rates of hydrogen and/or of the one or more comonomers to the polymerization reactor.


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

Ethylene polymer composition comprising, all per cent amounts being by weight: A) 30-60% of an ethylene polymer containing 10% or less, referred to the weight of A), of a fraction XSA soluble in xylene at 25C; B) 40-70% of a copolymer of ethylene with at least one olefin of formula HC2=CHR, where R is a alkyl radical, linear or branched, having from 2 to 8 carbon atoms, containing 65-90% of ethylene and 55-15% of a fraction XSB soluble in xylene at 25C, both ethylene and XSB amounts being referred to the weight of B), the intrinsic viscosity [] of the XSB fraction ranging from 0.8 to 3.2 dl/g; wherein the amounts of A) and B) are referred to the total weight of A) + B).


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: 2017-01-17

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: 2017-04-05

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).

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