Abstract: The invention relates to a process for producing a polypropylene film having a small dynamic coefficient of friction (CoF) and to a film obtained by this process. The invention further relates to the use of a polypropylene composition in a film forming process in order to reduce the required amount of slip agent for achieving a certain CoF and, alternatively, to the use of a polypropylene composition in a film forming process in order to reduce the required storage time for achieving a certain CoF.
Type:
Grant
Filed:
May 13, 2005
Date of Patent:
November 10, 2009
Assignee:
Borealis Technology Oy
Inventors:
Johannes Wolfschwenger, Manfred Kirchberger, Peter Niedersuess, Holger Poehler, Peter Denifl, Timo Leinonen
Abstract: The present invention relates to a process for the production of catalysts, particularly of Ziegler-Natta type of catalysts for olefin polymerisation, to the catalysts as such, and to their use in polymerising olefins.
Type:
Grant
Filed:
June 6, 2007
Date of Patent:
October 27, 2009
Assignee:
Borealis Technology Oy
Inventors:
Thomas Garoff, Kari Pesonen, Päivi Waldvogel, Timo V. Laine, Peter Denifl, Jarmo Lindroos
Abstract: The present invention concerns a multimodal polyethylene composition comprising a base resin comprising three ethylene homo- or copolymer fractions (A), (B) and (C) with different weight average molecular weight Mw, wherein a) fraction (A) has an MFR21 equal or lower than 20 g/10 min, b) fraction (B) has a lower weight average molecular weight than fraction (C), c) fraction (C) has a lower weight average molecular weight than fraction (A), d) the composition has a viscosity at a shear stress of 747 Pa (eta747) of 350 kPas or higher, and e) the composition has a MFR5 of 0.15 g/10 min or higher and a white spot area of 1% or below. Furthermore, the present invention relates to a process for the production of such a composition as well as to the use of such a composition for the production of a pipe, for moulding applications, and wire and cable applications.
Type:
Application
Filed:
November 2, 2005
Publication date:
October 8, 2009
Applicant:
BOREALIS TECHNOLOGY OY
Inventors:
Mats Baeckman, Bill Gustafsson, Eric Van Praet, Remko Van Marion
Abstract: The present invention relates to a multimodal polyethylene composition wherein (i) the composition has an MFR2 of 0.1 to 100 g/10 min, (ii) the shear thinning index SHI(1,100) and the log MFR2 of the composition satisfy the following relation: SHI(1,100)??10.58 log MFR2 [g/10 min]/(g/10 min)+12.94, and (iii) the composition has an environmental stress crack resistance ESCR of 10 h or more. Furthermore, the present invention relates to a process for the production of said composition, an injection moulded article, in particular a cap or closure, comprising said composition and to the use of said composition for the production of an injection moulded article.
Type:
Application
Filed:
November 2, 2005
Publication date:
October 8, 2009
Applicant:
BOREALIS TECHNOLOGY OY
Inventors:
Katrin Nord-Varhaug, Svein Staal Eggen, Hans Joerg Fell
Abstract: The present invention provides for a method for preparing a storable fluidic olefin polymerisation catalyst composition, said catalyst comprising an organometallic compound of a transition metal of Group 3 to 10 of the Periodic Table (IUPAC), or of an actinide or lanthanide, and the use of such composition for polymerising ?-olefins.
Abstract: The present invention relates to a polyethylene resin comprising A) a first ethylene homo- or copolymer fraction, and B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower molecular weight than fraction (B), characterized in that the polymer resin powder obtained directly after the final polymerisation step has a particle size distribution PSD95/5 equal to or smaller than 12. Furthermore, the invention relates to a process for the production of a polymer composition comprising: (i) a step in which ethylene monomers, and optionally further alpha-olefin-comonomers, are polymerised in liquid phase in the presence of a polymerisation catalyst, (ii) a step in which ethylene monomers, and optionally further alpha-olefin comonomers, are polymerised in the gas phase in the presence of a polymerisation catalyst, and (iii) obtaining a polymer resin powder after the final polymerisation step wherein the powder has a particle size distribution PSD95/5 equal to or smaller than 12.
Type:
Grant
Filed:
April 27, 2006
Date of Patent:
September 22, 2009
Assignee:
Borealis Technology Oy
Inventors:
Remko Van Marion, Bill Gustafsson, Mats Baeckman, Erik Van Praet
Abstract: The present invention relates to a crosslinkable polymer composition, comprising (i) a polyolefin, (ii) a polar copolymer, and (iii) a glycerol ester compound.
Type:
Application
Filed:
June 1, 2006
Publication date:
September 10, 2009
Applicant:
Borealis Technology Oy
Inventors:
Annika Smedberg, Perry Nylander, Detlef Wald, Nigel Hampton
Abstract: The present invention relates to a crosslinkable polymer composition, comprising (i) an unsaturated polyolefin having a total amount of carbon-carbon double bonds/1000 carbon atoms of more than 0.37, and (ii) at least one ether and/or ester group containing additive selected from the group consisting of polyethylene glycol, a glycerol ester compound, polypropylene glycol, an amido group containing fatty acid ester, ethoxylated and/or propoxylated pentaerythritol, an alpha-tocopherol ester, an ethoxylated and/or propoxylated fatty acid, and derivatives thereof.
Abstract: A power or communications cable having an outer sheath layer made of a polyethylene composition including a base resin which comprises (A) a first ethylene homo- or copolymer fraction, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower molecular weight than fraction (B), and the base resin has a molecular weight distribution Mw/Mn of more than 14.
Type:
Grant
Filed:
June 28, 2006
Date of Patent:
August 25, 2009
Assignee:
Borealis Technology Oy
Inventors:
Remko Van Marion, Roger Carlsson, Hans Eklind, Irene Helland
Abstract: The present invention relates to a process for preparing a propylene random copolymer comprising polymerization of propylene with a comonomer, said comonomer being ethylene or an ?-olefin comprising at least four carbon atoms, in the presence of a catalyst in a multistage process comprising polymerization of propylene with a comonomer in a first reaction zone including at least one slurry reactor to give a first polymerization product, transferring said first product to a second reaction zone including at least one gas phase reactor and polymerisations of propylene with a comonomer in said gas phase reactor in the presence of said first polymerization product, wherein the temperature in the gas phase reactor is at least 10° C. higher than in the slurry reactor and to a polymer obtainable by this process.
Type:
Grant
Filed:
August 9, 2007
Date of Patent:
August 25, 2009
Assignee:
Borealis Technology Oy
Inventors:
Pirjo Jaaskelainen, Norbert Hafner, Paivi Pitkanen, Markus Gahleitner, Olli Tuominen, Wilfried Toltsch
Abstract: A process for producing bimodal linear low-density polyethylene polymer compositions, useful for making films. The polymer compositions have a melt flow rate MFR2 of 0.4 to 1.0 g/10 min and a density of 918 to 925 kn/m3. The process to produce the polymer compositions involves copolymerizing ethylene with an alpha-olefin comonomer in a loop reactor to produce a low molecular weight polymer having a melt flow rate MFR2 of 50 to 500 g/10 min and a density of 945 to 953 kg/m3. The polymerization is continued in a gas phase reactor to produce a high molecular weight polymer, such that the final polymer composition has the desired properties. The final composition contains from 41 to 48% by weight of the low molecular weight polymer and from 59 to 52% by weight of the high molecular weight polymer. The resulting films have an excellent visual appearance and good mechanical properties. The compositions can easily be converted to films. The process can be operated a long time without a shutdown.
Type:
Grant
Filed:
June 19, 2003
Date of Patent:
August 18, 2009
Assignee:
Borealis Technology Oy
Inventors:
Jari Äärilä, Irene Helland, Ole Jan Myhre, Jorunn Nilsen, Markku Vahteri
Abstract: The present invention relates to a multimodal polyethylene composition for pipes which comprises polyethylene composition comprising a base resin which comprises (A) an ethylene homo- or copolymer fraction, and (B) an ethylene copolymer fraction comprising at least one alphaolefin comonomer having at least 4 carbon atoms, wherein (i) fraction (A) has a lower average molecular weight than fraction (B), and (ii) the comonomer content and the density d of the base resin satisfy the following relation: comonomer [mol %]>?0.0612 d [kg/m3] mol %/(kg/m3)+58.6, and (iii) the base resin comprises mom than 0.5 mol % of at least one alpha-olefin comonomer having at leant 4 carbon atoms. Furthermore, the present invention relates to a process for the production or said composition, a pipe comprising said composition and to the use of said composition for the production of a pipe.
Type:
Application
Filed:
November 2, 2005
Publication date:
August 13, 2009
Applicant:
BOREALIS TECHNOLOGY OY
Inventors:
Bill Gustafsson, Mats Baeckman, Erik Van Praet
Abstract: The present invention in a first embodiment concerns a multimodal, preferably bimodal, polyethylene composition comprising a base resin which comprises (A) a first ethylene homo- or copolymer fraction, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower molecular weight than fraction (B), the ratio of the MFR2 of fraction (A) and the MFR5 of the base resin being from 200 to 1500, and the composition has a white spot area of 1% or below. In a second embodiment, the present invention concerns a polyethylene composition comprising a base resin comprising (A) a first ethylene homo- or copolymer fraction, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower molecular weight than fraction (B), the ratio of the MFR2 of fraction (A) and the MFR5 of the base resin being from 200 to 1500, and the composition has a rating in the ISO 18553 white spot rating test of below 4.5.
Type:
Application
Filed:
November 2, 2005
Publication date:
August 6, 2009
Applicant:
BOREALIS TECHNOLOGY OY
Inventors:
Mats Baeckman, Bill Gustafsson, Eric Van Praet, Remko Van Marion
Abstract: Medium to large volume containers having improved environmental stress crack resistance are blow moulded from bimodal high density polyethylene.
Type:
Grant
Filed:
August 15, 2000
Date of Patent:
August 4, 2009
Assignee:
Borealis Technology Oy
Inventors:
Jorunn Nilsen, Svein Eggen, Lars Thorn, Hege Vale Baann
Abstract: The present invention relates to particulate olefin polymerisation catalyst components comprising an alkaline earth metal, a compound of a transition metal and an electron donor, characterized in that the catalyst particle size distribution of the catalyst component is essentially monomodal and has a SPAN value below 1.2, where SPAN is defined as: (Particle diameter at 90% cumulative size)?(Particle diameter at 10% cumulative size)/(Particle diameter at 50% cumulative size).
Type:
Application
Filed:
May 31, 2007
Publication date:
July 23, 2009
Applicant:
BOREALIS TECHNOLOGY OY
Inventors:
Petri Rekonen, Peter Denifl, Timo Leinonen
Abstract: The present invention relates to a polypropylene resin with low shrinkage, excellent impact strength and high stiffness and scratch resistance which comprises A) less than 70 wt % of a propylene polymer A having a melt flow rate (MFR2) between 0.01 and 100 g/10 min, B) more than 20 wt % of an ethylene-propylene copolymer B, containing at least 40 wt % propylene and having an intrinsic viscosity between 1 and 3.5 dl/g, and C) less than 20 wt % of an ethylene polymer C with a density between 905 and 930 kg/m3 and a melt flow rate (MFR2) between 0.01 and 10 g/10 min, to the use of said resin for the production of a molded or extruded article and to an article comprising said resin.
Type:
Application
Filed:
November 13, 2006
Publication date:
May 28, 2009
Applicant:
Borealis Technology Oy
Inventors:
Doris Machl, Klaus Bernreitner, Christelle Grein
Abstract: The present invention relates to a process for the preparation of multimodal ethylene homo- or copolymers in at least two stages, the process comprising preparation of a first ethylene homo- or copolymer fraction in a loop reactor in slurry phase, preparation of a second ethylene homo- or copolymer fraction in a gas phase reactor, by using a catalyst not containing an inorganic oxide support, and operating the gas phase reactor in such conditions that at least part of the gas is recycled, and that at least a part of the recycled gas is condensed and the (partially) condensed gas is re-introduced into the gas phase reactor.
Type:
Application
Filed:
August 8, 2006
Publication date:
May 28, 2009
Applicant:
BOREALIS TECHNOLOGY OY
Inventors:
Henrik Andtsjö, Michiel Bergstra, Ralf Karlsson, Klaus Nyfors, Urban Thorngren
Abstract: The present invention provides a heterophasic polypropylene composition comprising a selective cross-linkable dispersed phase, a method for the production thereof, and their use in different applications. The cross-linkable reaction can be carried out at a temperature of 10 to 40° C. under a humidity of below 85% and with cross-linking degree of at least 30%.
Abstract: A process for producing at least two different propylene polymer grades, in which process the isotacticity of the polymer is changed while keeping the melt flow rate of the polymer at a predetermined level during a transition of production from a first polymer grade to a second. The process is carried out in a polymerization arrangement comprising at least one polymerization reactor, where propylene is polymerized, optionally with comonomers, under polymerization conditions in the presence of hydrogen as a molecular weight controlling agent and a Ziegler-Natta catalyst system. The catalyst system comprises a catalyst component and an external donor. During a transition of production from the first polymer grade to the second, the external donor is changed, but the hydrogen feed is kept at a predetermined level.