US20080139750A1 - Polyethylene Molding Composition for Producing Blown Films Having Improved Processability - Google Patents

Polyethylene Molding Composition for Producing Blown Films Having Improved Processability Download PDF

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US20080139750A1
US20080139750A1 US11/885,356 US88535606A US2008139750A1 US 20080139750 A1 US20080139750 A1 US 20080139750A1 US 88535606 A US88535606 A US 88535606A US 2008139750 A1 US2008139750 A1 US 2008139750A1
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copolymer
weight
molecular weight
molding composition
ethylene
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Joachim Berthold
Lutz-Gerd Heinicke
Gerhardus Meier
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Basell Polyolefine GmbH
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Basell Polyolefine GmbH
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Priority to DE102005009896A priority Critical patent/DE102005009896A1/en
Priority to DE102005009896.7 priority
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Priority to PCT/EP2006/060223 priority patent/WO2006092378A1/en
Publication of US20080139750A1 publication Critical patent/US20080139750A1/en
Assigned to BASELL POLYOLEFINE GMBH reassignment BASELL POLYOLEFINE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BERTHOLD, JOACHIM, HEINICKE, LUTZ-GERD, MEIER, GERHARDUS
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04Homopolymers or copolymers of ethene
    • C08L23/06Polyethene
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18Manufacture of films or sheets
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04Homopolymers or copolymers of ethene
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04Homopolymers or copolymers of ethene
    • C08L23/08Copolymers of ethene
    • C08L23/0807Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04Homopolymers or copolymers of ethene
    • C08L23/08Copolymers of ethene
    • C08L23/0807Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815Copolymers of ethene with aliphatic 1-olefins
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J2323/00Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04Homopolymers or copolymers of ethene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J2323/00Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04Homopolymers or copolymers of ethene
    • C08J2323/06Polyethene
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J2423/00Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04Homopolymers or copolymers of ethene
    • C08J2423/08Copolymers of ethene
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00Applications
    • C08L2203/16Applications used for films
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/02Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/03Polymer mixtures characterised by other features containing three or more polymers in a blend
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04Homopolymers or copolymers of ethene
    • C08L23/08Copolymers of ethene

Abstract

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 μm. The molding composition has a density at a temperature of 23° C. in the range from 0.953 to 0.960 g/cm3 and an MFR190/5 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.

Description

  • This application is the U.S. national phase of International Application PCT/EP2006/060223, filed Feb. 23, 2006, claiming priority to German Patent Application 102005009896.7 filed Mar. 1, 2005; the disclosures of International Application PCT/EP2006/060223, and German Patent Application 102005009896.7, each as filed, are incorporated herein by reference.
  • FIELD OF THE INVENTION
  • The present invention relates to a polyethylene (PE) molding composition having a multimodal molar mass distribution, i.e. a molding composition comprising a plurality of ethylene polymer fractions having distinct molar masses.
  • In the present description and in the following claims, unless otherwise indicated, the term “polymer” is used to indicate both a homopolymer, i.e. a polymer comprising repeating monomeric units derived from equal species of monomers, and a copolymer, i.e. a polymer comprising repeating monomeric units derived from at least two different species of monomers, in which case reference will be made to a binary copolymer, to a terpolymer, etc. depending on the number of different species of monomers used.
  • The multimodal PE molding composition of the invention is particularly useful for producing blown films.
  • The invention also relates to a process for preparing this PE molding composition.
  • The invention further relates to a blown film produced from the above-mentioned molding composition by a blown film process.
  • PRIOR ART
  • Polyethylene is used on a large scale for producing films by a blown film extrusion process thanks to the mechanical strength, processability, good chemical resistance and low intrinsic weight of polyethylene.
  • So, for example, EP-A-0 603 935 describes a molding composition based on polyethylene which has a bimodal molar mass distribution and is suitable for producing films and moldings having good mechanical properties.
  • However, the prior art films made of bimodal polyethylene have an inadequate processability, in particular in terms of bubble stability during processing, and an insufficient drawing capability. Attempts to attain an improved bubble stability inevitably resulted in an unacceptable worsening of the mechanical properties, particularly in terms of Dart Drop Impact strength (DDI), which is determined in accordance with ASTM D 1709, method A.
  • SUMMARY OF THE INVENTION
  • The technical problem underlying the present invention is therefore that of providing a novel PE molding composition having an improved processability in the blown film extrusion process without impairing the mechanical strength, particularly in terms of DDI. More in particular, the mechanical strength of films produced from the novel PE molding composition of the invention, expressed as DDI, should not be lower than 280 g for a film having a thickness of 20 μm.
  • For the purpose of the present description and of the claims which follow, except where otherwise indicated, all numbers expressing amounts, quantities, percentages, and so forth, are to be understood as being modified in all instances by the term “about”. Also, all ranges include any combination of the maximum and minimum points disclosed and include any intermediate ranges therein, which may or may not be specifically enumerated herein.
  • The above-mentioned technical problem is solved by a PE molding composition having a multimodal molar mass distribution, a density at a temperature of 23° C. in the range from 0.953 to 0.960 g/cm3 and a MFR190/5 of the final product after extrusion in the range from 0.10 to 0.50 dg/min, the polyethylene molding composition comprising:
      • from 30 to 60% by weight of a first ethylene polymer fraction made of an ethylene 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, said first copolymer B having a second molecular weight higher than said first molecular weight, and
      • from 10 to 30% by weight of a third ethylene polymer fraction made of a second copolymer C of ethylene and at least one second comonomer, said second copolymer C having a third molecular weight higher than said second molecular weight,
      • all percentages being based on the total weight of the molding composition.
  • In the present description and in the following claims, the melt flow rate MFR190/5 is the melt flow rate measured in accordance with ISO 1133 at 190° C. and under a load of 5 kg. The density is determined in accordance with ISO1183.
  • Advantageously, the films produced from the novel PE molding composition of the invention have a better bubble stability, a reduced melt pressure and adequate mechanical properties when compared to the prior art films, in the sense that the DDI is above 280 g for a film having a thickness of 20 μm.
  • The polyethylene molding composition of the invention has a density at a temperature of 23° C. in the range from 0.953 to 0.960 g/cm3, preferably from 0.955 to 0.959 g/cm3, and a broad trimodal molar mass distribution.
  • According to a preferred embodiment of the invention, the polyethylene molding composition comprises:
      • from 42 to 52% by weight of the first ethylene polymer fraction, i.e. of the homopolymer A,
      • from 27 to 38% by weight of the second ethylene polymer fraction, i.e. of a further homopolymer or of the first copolymer B, and
      • from 15 to 25% by weight of the third ethylene polymer fraction, i.e. of the second copolymer C.
  • The second copolymer B preferably contains, in addition to ethylene, predetermined proportions, preferably from 0.1 to 1.0% by weight based on the weight of the second copolymer B, of at least one first olefin comonomer having from 4 to 8 carbon atoms.
  • Examples of such comonomer(s) are 1-butene, 1-pentene, 1-hexene, 1-octene and 4-methyl-1-pentene and mixture thereof.
  • In an analogous manner, the second copolymer C is preferably a copolymer of ethylene and of at least one second comonomer preferably selected from the group of olefins having from 4 to 8 carbon atoms, more preferably from the above-mentioned list of comonomers.
  • Preferably, the at least one second comonomer is present in an amount of from 1 to 15% by weight, based on the weight of the second copolymer C.
  • Furthermore, the PE molding composition of the invention has a melt flow rate MFR190/5 of the final product after extrusion in accordance with ISO 1133, in the range from 0.10 to 0.50 g/10 min, preferably from 0.32 to 0.42 g/10 min.
  • Preferably, the PE molding composition of the invention has a viscosity number VN3, measured in accordance with ISO/R 1191 in decalin at a temperature of 135° C., in the range from 270 to 400 cm3/g, in particular from 320 to 400 cm3/g.
  • If, as provided by a preferred embodiment of the invention described more in detail in the following, the PE molding composition is prepared by means of a cascaded polymerization process comprising at least three successive polymerization stages comprising a first stage, a second stage and a third stage, the trimodality of the composition of the invention can be described in terms of viscosity numbers VN, measured in accordance with ISO/R 1191, of the ethylene polymer fractions formed in the different subsequent polymerization stages.
  • Here, the different viscosity numbers will be indicated as explained in the following.
  • The viscosity number VN1 shall be used to indicate the viscosity number measured on the polymer after the first polymerization stage. The viscosity number VN1 is identical to the viscosity number VNA of the homopolymer A.
  • According to a preferred embodiment of the invention, the viscosity number VN1 is in the range from 60 to 110 cm3/g, more preferably from 60 to 110 cm3/g.
  • The viscosity number VN2 shall be used to indicate the viscosity number measured on the polymer after the second polymerization stage. The viscosity number VN2 is therefore the viscosity number of the mixture of homopolymer A plus further homopolymer or first copolymer B. The viscosity number of the further homopolymer or of the first copolymer B formed in the second polymerization stage can be instead determined only mathematically.
  • According to a preferred embodiment of the invention, the viscosity number VN2 is in the range from 250 to 400 cm3/g, preferably from 300 to 370 cm3/g.
  • The viscosity number VN3 shall be used to indicate the viscosity number measured on the polymer after the third polymerization stage. The viscosity number VN3 is therefore the viscosity number of the mixture of homopolymer A plus further homopolymer or first copolymer B plus second copolymer C. The viscosity number of the second copolymer C formed in the third polymerization stage can be instead determined only mathematically.
  • According to a preferred embodiment of the invention, the viscosity number VN3 is in the range from 270 to 400 cm3/g, in particular from 320 to 440 cm3/g.
  • The PE molding composition of the invention may further comprise additional additives. Such additives may be, for example, heat stabilizers, anti-oxidants, UV stabilizers, light stabilizers, metal deactivators, peroxide-destroying compounds, basic co-stabilizers in amounts of from 0 to 10% by weight, preferably from 0 to 5% by weight, but also fillers, reinforcing materials, plasticizers, lubricants, emulsifiers, pigments, optical brighteners, flame retardants, antistatics, blowing agents or combinations of these in total amounts of from 0 to 50% by weight, based on the total weight of the composition.
  • The present invention also relates to a process for preparing a polyethylene molding composition as described above, comprising the step of polymerizing ethylene, said at least one first comonomer and said at least one second comonomer in suspension at a temperature preferably in the range from 20 to 120° C., more preferably from 70 to 90° C. and, still more preferably, from 80 to 90° C., and at a pressure preferably in the range from 2 to 10 bar and, preferably, in the presence of a Ziegler catalyst.
  • The process for preparing the PE molding composition is preferably carried out in the presence of a catalytic system comprising a highly active Ziegler catalyst comprising a transition metal compound and a co-catalyst, preferably an organo-aluminum compound, by means of a multistage reaction sequence comprising at least three successive polymerizations.
  • Preferably, the polymerization is carried out in multiple successive polymerization stages comprising a first stage, a second stage, and a third stage performed in corresponding multiple reactors comprising a first reactor, a second reactor and a third reactor arranged in series.
  • The polymerization is preferably carried out in a cascaded suspension polymerization as described in EP-A-1 228 101.
  • The molar mass in each polymerization stage is preferably adjusted by means of a chain transfer agent, preferably hydrogen, and preferably in such a manner that the above-mentioned preferred values of viscosity numbers are obtained after each polymerization stage.
  • The PE molding composition of the invention is particularly suitable for the production of blown films by the blown film extrusion process. A possible way to carry out such process is detailed in the following.
  • The polyethylene molding composition is preferably firstly plasticized at temperatures in the range from 200 to 250° C. in an extruder. Subsequently, the plasticized polyethylene is extruded in the molten state through an annular die so as to form a bubble having a substantially tubular form. The bubble is cooled, preferably by means of compressed air, and subsequently collapsed by means of rollers and rolled up into a film.
  • The molding composition of the invention can be processed particularly well by the film blowing process because this composition ensures an improved drawing capability and an adequate film bubble stability even under the typical processing conditions of large scale industrial plants. In other words, thanks to the drawing capability, particularly thin films having a regular and constant thickness may be produced.
  • Thanks to the bubble stability, the film bubble coming out from the annular die remains stable even at high take-off speeds and shows no tendency to alter its geometry neither in axial direction nor in radial direction. Preferably, the bubble has a frost line delimiting the molten material from the solidified material oscillating not more than ±2 cm in axial direction during the shock test (performed as detailed in following Example 3) at a maximal take-off speed.
  • The invention further relates to a film comprising a PE molding composition as described above and having a thickness in the range from 8 to 200 μm, preferably from 10 to 100 μm, more preferably from 8 to 50 μm and, still more preferably, from 8 to 10 μm. Preferably, the DDI of a film having a thickness of 20 μm is higher than 280 g.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • The present invention will be further described by means of the following preferred embodiments without restricting the scope of the invention.
  • EXAMPLE 1 Polymerization (Invention)
  • Ethylene was polymerized in a continuous process performed in a cascaded mode in three reactors reciprocally arranged in series. A Ziegler catalyst prepared by the method of EP-A 401 776, Example 1, was used, having an extremely high responsiveness to hydrogen and an activity sufficient to carry out the cascaded polymerization, since this catalyst was able to maintain the activity over a long period, from 1 to 8 hours.
  • The catalyst had in particular the following analytical composition:
  • Ti  6.2% by weight Mg 70.8% by weight Cl  23.0% by weight.
  • The catalyst was pre-activated by means of a sufficient amount of triethylaluminum and then fed into a first reactor in an amount of 4.8 mmol/h.
  • Sufficient suspension medium, in particular hexane, ethylene and hydrogen were additionally fed in the first reactor. The amount of ethylene (=46 kg/h) and the amount of hydrogen (=55 g/h) were set in such a manner that a percentage of 16.8% by volume of ethylene and a percentage of 68% by volume of hydrogen were measured in the gas space (gas temperature for the analytical measurement=5±1° C.) of the first reactor. The remainder was a mixture of nitrogen and vaporized suspension medium.
  • The polymerization in the first reactor was carried out at a temperature of 84° C. and under a pressure of 8.8 bar, corresponding to 0.88 MPa.
  • The suspension from the first reactor was then conveyed into a second reactor arranged in series with and downstream of the first reactor. The percentage of hydrogen in the gas space (gas temperature for the analytical measurement=5±1° C.) in the second reactor was reduced to 8.6% by volume by means of an intermediate H2 depressurization. An amount of 30.7 kg/h of ethylene together with a very small amount of a first comonomer, namely 1-butene, were introduced into the second reactor. 62.5% by volume of ethylene, 8.6% by volume of hydrogen and 0.4% by volume of 1-butene were measured in the gas space of the second reactor; the remainder was a mixture of nitrogen and vaporized suspension medium.
  • The polymerization in the second reactor was carried out at a temperature of 84° C. and under a pressure of 2.7 bar, corresponding to 0.27 MPa.
  • The suspension from the second reactor was conveyed via a further intermediate depressurization operated without off-gas into a third reactor arranged in series with and downstream of the second reactor. The hydrogen concentration was set to 14.6% by volume in the gas space by introducing hydrogen. Apart from 19.2 kg/h of ethylene, 240 g/h of a second comonomer equal to the first comonomer introduced in the second stage, namely 1-butene, and 6.9 g/h of hydrogen were additionally introduced into the third reactor.
  • A percentage of ethylene of 66% by volume, a percentage of hydrogen of 14.6% by volume and a percentage of 1-butene of 1% by volume were measured in the gas space of the third reactor (gas temperature for the analytical measurement=5±1° C.); the remainder was a mixture of nitrogen and vaporized suspension medium.
  • The polymerization in the third reactor was carried out at a temperature of 84° C. and under a pressure of 3 bar, corresponding to 0.3 MPa.
  • The suspension medium was separated off from the polymer suspension leaving the third reactor and the powder was dried and passed to pelletization.
  • The polyethylene molding composition prepared as described above had a density of 0.957 g/cm3, viscosity numbers VN1, VN2 and VN3, proportions WA, WB and WC of the homopolymer A, of the first copolymer B and, respectively, of the second copolymer C and melt flow rates MFR1, MFR2 and MFR3 which are reported in Table 1 below.
  • TABLE 1 Example 1 wA [% by weight] 48 wB [% by weight] 32 wC [% by weight] 20 VN1 [cm3/g] 81 VN2 [cm3/g] 337 VN3 [cm3/g] 365 MFR1(190° C./1.2 kg) [g/10 min] 85 MFR2(190° C./5 kg)[g/10 min] 1.1 MFR3(190° C./5 kg) [g/10 min] 0.65 MFRpellets(190° C./5 kg) [g/10 min] 0.39
  • The abbreviations for the physical properties in Table 1 have the following meanings:
      • WA, WB, WC=proportion of homopolymer A, first copolymer B and, respectively, second copolymer C in the total molding composition=reactor split, determined by the amount of ethylene fed into the respective reactor;
      • VN1, VN2, VN3=viscosity number of the polymer leaving the first, second and, respectively, third reactor measured in accordance with ISO/R 1191 in decalin at a temperature of 135° C.;
      • MFR1, MFR2, MFR3=melt flow rate of the polymer leaving the first, second and, respectively, third reactor, measured in accordance with ISO 1133 with indication of the temperature and the load;
      • MFRpellets=melt flow rate of the final product after extrusion.
    EXAMPLE 2 Film Preparation (Invention)
  • From the molding composition so prepared, a film was produced in the following way.
  • A film having a thickness of 20 μm was produced on an Alpine film blowing plant comprising an extruder with a diameter d1 of 50 mm and a length of 21×d1(=1.05 m) and an annular die having a diameter d2 of 120 mm and a gap width of 1 mm. The film was produced at a blow-up ratio of 4:1 and a neck length of 7.5×d2(=90 cm). The melt temperature of the molding composition in the extruder was 205-210° C.
  • The film properties are shown in Table 2 below.
  • EXAMPLE 3 Film Preparation (Comparison)
  • A 20 μm film was produced using a commercial film raw material from Borealis, which is commercially available under the designation FS 1560, on the same plant and under the same conditions described in Example 2 with the exception that the melt temperature of the molding composition in the extruder was 205-215° C.
  • The film properties are shown in Table 2 below.
  • TABLE 2 Example 2 (invention) Example 3 (comparison) Take-off: 58 m/min + + Shock test: + + Take-off: 63 m/min + + Shock test: + Take-off: 70 m/min + Shock test: + Take-off: 77 m/min + Shock test: + Take-off: 87 m/min + Shock test: + DDI [g] 290 310 Specks No specks high specks count Melt pressure [bar] 330 340
  • More in particular, the film bubble stability was determined by the following procedure, including a preliminary test and a shock test as detailed below.
  • In the preliminary test, the take-off speed was set at predetermined increasing take-off speeds, namely ar 58, 63, 70, 77 and 87 m/min(=maximum rolling-up speed). After the respective take-off speed had been attained and the neck length had been adjusted to 90 cm by adjusting the cooling air blower, the axial oscillation of the film bubble was observed.
  • The test was considered finished and passed at a given speed if the axial oscillation of the bubble being formed was in the range of ±2 cm over a period of observation of one (1) minute.
  • The shock test was subsequently carried out at the same take-off speed setting as in the preliminary test.
  • In the shock test, the bubble was made axially oscillate. This was performed by fully opening the iris of the cooling air blower for a period of about 7 s. The iris was then reset to the initial position. The opening and closing of the iris was monitored via the pressure of the cooling air. At room temperature greater than 25° C., however, the opening of the above-mentioned iris alone is not sufficient to set the film bubble into oscillation. Accordingly, at temperatures greater than 25° C., the iris was firstly opened and then shut completely for a maximum of 3 s, after which it was reset to the initial position, always monitoring by means of the air pressure. The shock test was considered passed at a given take-off speed if the oscillations of the film bubble had abated to ±2 cm within 2 minutes.
  • This was made for each one of the above-mentioned increasing take-off speeds. If the shock test or the preliminary test was not passed at a particular take-off speed, the stability grade corresponding to the previous lower take-off speed was awarded.
  • The dart drop impact strength of the films was determined according to the standard ASTM D 1709, method A.
  • The assessment of specks was carried out visually.

Claims (13)

1. A polyethylene molding composition having a multimodal molar mass distribution; a density at a temperature of 23° C. measured in accordance with ISO 1183, in the range from 0.953 to 0.960 g/cm3; and an MFR190/5, measured in accordance with ISO 1133, of the final product after extrusion in the range from 0.10 to 0.50 dg/min, said polyethylene molding composition comprising:
from 30 to 60% by weight of a first ethylene polymer fraction made of an ethylene 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 selected from the group of olefins having from 4 to 8 carbon atoms, said first copolymer B having a second molecular weight higher than said first molecular weight of the homopolymer A; and
from 10 to 30% by weight of a third ethylene polymer fraction made of a second copolymer C of ethylene and at least one second comonomer, said second copolymer C having a third molecular weight higher than said second molecular weight of the copolymer B,
all percentages being based on the total weight of the molding composition.
2. The polyethylene molding composition according to claim 1, comprising:
from 42 to 52% by weight of the first ethylene polymer fraction;
from 27 to 38% by weight of the second ethylene polymer fraction, the first copolymer B containing from 0.1 to 1.0% by weight, based on the weight of copolymer B, of said at least one first comonomer; and
from 15 to 25% by weight of the third ethylene polymer fraction, the second copolymer C containing from 1 to 15% by weight, based on the weight of the second copolymer C, of said at least one second comonomer.
3. The polyethylene molding composition according to claim 1, wherein said first comonomer and said second comonomer are independently selected from 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene and mixtures thereof.
4. The polyethylene molding composition according to claim 1, wherein the density is from 0.955 to 0.959 g/cm3 and the MFR190/5 of the final product after extrusion is in the range from 0.32 to 0.42 g/10 min.
5. The polyethylene molding composition according to claim 4, further comprising a viscosity number VN3, measured in accordance with ISO/R 1191 in decalin at a temperature of 135° C., in the range from 270 to 400 cm3/g.
6. A process for preparing a polyethylene molding composition comprising
from 30 to 60% by weight of a first ethylene polymer fraction made of an ethylene 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 selected from the group of olefins having from 4 to 8 carbon atoms, said first copolymer B having a second molecular weight higher than said first molecular weight of the homopolymer A; and
from 10 to 30% by weight of a third ethylene polymer fraction made of a second copolymer C of ethylene and at least one second comonomer, said second copolymer C having a third molecular weight higher than said second molecular weight of the copolymer B.
all percentages being based on the total weight of the molding composition,
wherein the polyethylene molding composition has a multimodal molar mass distribution; a density at a temperature of 23° C., measured in accordance with ISO 1183, in the range from 0.953 to 0.960 g/cm3; and an MFR190/5, measured in accordance with ISO 1133, of the final product after extrusion in the range from 0.10 to 0.50 dg/min,
the process comprising the step of polymerizing ethylene, said at least one first comonomer and said at least one second comonomer in suspension at temperatures in the range from 20 to 120° C., at a pressure in the range from 2 to 10 bar and in the presence of a Ziegler catalyst comprising a transition metal compound and an organo-aluminum compound.
7. The process according to claim 6, wherein said polymerization step is carried out in multiple successive polymerization stages comprising a first stage, a second stage, and a third stage performed in corresponding multiple reactors comprising a first reactor, a second reactor and a third reactor arranged in series, wherein the first, second and third stages each comprise a molar mass of a polyethylene composition and a hydrogen concentration, wherein the molar mass of the polyethylene composition prepared in each stage is adjusted in each case by means of hydrogen.
8. The process according to claim 7, wherein the hydrogen concentration in the first polymerization stage is adjusted to obtain in the homopolymer A a viscosity number VN1, measured in accordance with ISO/R 1191 in the range from 70 to 110 cm3/g.
9. The process according to claim 7, wherein the hydrogen concentration in the second polymerization stage is adjusted to obtain in a mixture of homopolymer A plus homopolymer or copolymer B a viscosity number VN2, measured in accordance with ISO/R 1191, in the range from 250 to 400 cm3/g.
10. The process according to claim 7, wherein the hydrogen concentration in the third polymerization stage is adjusted to obtain in a mixture of homopolymer A plus first homopolymer or copolymer B plus second copolymer C a viscosity number VN3, measured in accordance with ISO/R 1191, in the range from 280 to 400 cm3/g.
11. A process comprising forming a blown film having a thickness in the range from 8 to 200 μm, the film comprising a polyethylene molding composition having a multimodal molar mass distribution; a density at a temperature of 23° C., measured in accordance with ISO 1183, in the range from 0.953 to 0.960 g/cm3; and an MFR190/5, measured in accordance with ISO 1133, of the final product after extrusion in the range from 0.10 to 0.50 dg/min said polyethylene molding composition comprising:
from 30 to 60% by weight of a first ethylene polymer fraction made of an ethylene 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 selected from the group of olefins having from 4 to 8 carbon atoms, said first copolymer B having a second molecular weight higher than said first molecular weight of the homopolymer A; and
from 10 to 30% by weight of a third ethylene polymer fraction made of a second copolymer C of ethylene and at least one second comonomer, said second copolymer C having a third molecular weight higher than said second molecular weight of the copolymer B,
all percentages being based on the total weight of the molding composition.
12. The process according to claim 11, wherein the blown film is formed via a blown film process comprising the step of melting the polyethylene molding composition to obtain a polyethylene melt, extruding the polyethylene melt by forcing the polyethylene melt through an annular die to form a bubble having a frost line oscillating at a maximum of ±2 cm in axial direction during the shock test at a maximal take-off speed.
13. A blown film having a thickness in the range from 8 to 200 μm; a dart drop impact DDI, measured in accordance with ASTM D 1709 method A, of more than 280 g, measured on a film having a thickness of 20 μm, comprising a polyethylene molding composition having a multimodal molar mass distribution; a density at a temperature of 23° C. measured in accordance with ISO 1183, in the range from 0.953 to 0.960 g/cm3; and an MFR190/5, measured in accordance with ISO 1133, of the final product after extrusion in the range from 0.10 to 0.50 dg/min, said polyethylene molding composition comprising:
from 30 to 60% by weight of a first ethylene polymer fraction made of an ethylene 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 selected from the group of olefins having from 4 to 8 carbon atoms, said first copolymer B having a second molecular weight higher than said first molecular weight of the homopolymer A; and
from 10 to 30% by weight of a third ethylene polymer fraction made of a second copolymer C of ethylene and at least one second comonomer, said second copolymer C having a third molecular weight higher than said second molecular weight of the copolymer B,
all percentages being based on the total weight of the molding composition.
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090105422A1 (en) * 2005-08-25 2009-04-23 Basell Polyolefine Gmbh Multimodal polyethylene molding composition for producing pipes having improved mechanical properties
US20090272721A1 (en) * 2005-09-28 2009-11-05 Tadahiro Ohmi Athmosphere-Controlled Bonding Apparatus, Bonding Method, and Electronic Device
US20090306299A1 (en) * 2006-12-22 2009-12-10 Basell Polyolefine Gmbh Multimodal polyethylene composition, mixed catalyst and process for preparing the composition
US20100010163A1 (en) * 2005-06-30 2010-01-14 Basell Polyolefine Gmbh Polyethylene Molding Composition for Producing Injection-Molded Finished Parts
US8501884B2 (en) 2007-04-13 2013-08-06 Basell Polyolefine Gmbh Polyethylene and catalyst composition and process for the preparation thereof
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US9605092B2 (en) 2013-08-05 2017-03-28 Ineos Europe Ag Polymerisation process
US9963529B1 (en) 2017-04-19 2018-05-08 Nova Chemicals (International) S.A. Multi reactor solution polymerization

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Citations (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4336352A (en) * 1979-08-24 1982-06-22 Asahi Kasei Kogyo Kabushiki Kaisha Blend of three ethylene polymers
US4447587A (en) * 1981-06-20 1984-05-08 Hoechst Aktiengesellschaft Process for the preparation of a polyolefin, and a catalyst for this process
US4461873A (en) * 1982-06-22 1984-07-24 Phillips Petroleum Company Ethylene polymer blends
US4536550A (en) * 1983-04-21 1985-08-20 Asahi Kasei Kogyo Kabushiki Kaisha Polyethylene composition
US4859749A (en) * 1987-07-16 1989-08-22 Hoechst Aktiengesellschaft Process for the preparation of a polyolefin with a wide molecular mass distribution
US5136924A (en) * 1990-01-26 1992-08-11 Sig Schweizerische Industrie-Gesellschaft Silencer for firearms
US5242548A (en) * 1988-08-19 1993-09-07 Youngner Philip G Vacuum distillation apparatus
US5258161A (en) * 1992-06-15 1993-11-02 Union Carbide Chemicals & Plastics Technology Corporation Blown film extrusion
US5338589A (en) * 1991-06-05 1994-08-16 Hoechst Aktiengesellschaft Polyethylene molding composition
US5350807A (en) * 1993-06-25 1994-09-27 Phillips Petroleum Company Ethylene polymers
US5422400A (en) * 1991-10-25 1995-06-06 Maruzen Polymer Company, Ltd. Method for producing an ethylenic polymer composition
US5576400A (en) * 1991-07-23 1996-11-19 Mitsubishi Kasei Corporation Process for producing olefin polymer
US5648309A (en) * 1990-06-01 1997-07-15 Hoechst Aktiengesellschaft Process for the preparation of a poly-1-olefin
US5882750A (en) * 1995-07-03 1999-03-16 Mobil Oil Corporation Single reactor bimodal HMW-HDPE film resin with improved bubble stability
US6156845A (en) * 1995-10-18 2000-12-05 Chisso Corporation Polyolefin composition and method of making
US6248831B1 (en) * 1999-12-06 2001-06-19 Union Carbide Chemicals & Plastics Technology Corporation High strength polyethylene film
US6329054B1 (en) * 1995-07-10 2001-12-11 Borealis Polymers Oy Cable and method for using a cable-sheathing composition including an ethylene polymer mixture
US6344522B1 (en) * 1992-12-21 2002-02-05 Solvay Polyolefins - Europe Belgium Process for the preparation of a composition containing ethylene polymers, composition containing ethylene polymers and use thereof
US6407185B1 (en) * 1992-12-21 2002-06-18 Solvay (Societe Anonyme) Process for the preparation of a composition containing ethylene polymers, composition containing ethylene polymers and use thereof
US20030149180A1 (en) * 2001-08-17 2003-08-07 Dow Global Technologies Inc. Bimodal polyethylene composition and articles made therefrom
US6642323B1 (en) * 1998-05-08 2003-11-04 Borealis Technology Oy Process to produce a homogeneous polyethylene material
US6713561B1 (en) * 1999-09-24 2004-03-30 Basell Polyolefine Gmbh Polyethylene moulding compound with an improved ESCR/stiffness relation and an improved swelling rate, a method for the production thereof and the use thereof
US6900266B2 (en) * 2001-06-14 2005-05-31 Solvay Polyolefins Europe-Belgium Method of compounding a multimodal polyethylene composition
US20060052542A1 (en) * 2002-12-24 2006-03-09 Bassell Polyolefine Gmbh Polyethylene composition for producing l-ring drums
US20060074194A1 (en) * 2002-12-24 2006-04-06 Basell Polyolefine Gmbh Polyethylene blow molding composition for producing jerry cans
US20060074193A1 (en) * 2002-12-24 2006-04-06 Basell Polyolefine Gmbh Polyethylene blow molding composition for producing large containers
US20060155058A1 (en) * 2002-12-19 2006-07-13 Basell Polyolefine Gmbh Polyethylene blow molding composition for producing small containers
US20060178482A1 (en) * 2005-02-07 2006-08-10 Kwalk Tae H Polyethylene blend compositions
US7101629B2 (en) * 2003-12-05 2006-09-05 Univation Technologies, Llc Polyethylene films
US20080199674A1 (en) * 2005-03-01 2008-08-21 Basell Polyolefine Gmbh Polyethylene Molding Composition for Producing Blown Films Having Improved Mechanical Properties and Processability
US20090105422A1 (en) * 2005-08-25 2009-04-23 Basell Polyolefine Gmbh Multimodal polyethylene molding composition for producing pipes having improved mechanical properties

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3918646A1 (en) 1989-06-08 1990-12-13 Hoechst Ag Process for preparing a poly-l-olefin
DE4017661A1 (en) 1990-06-01 1991-12-05 Hoechst Ag A process for producing a poly-1-olefin
JP3045548B2 (en) 1990-12-28 2000-05-29 日本石油化学株式会社 Polyethylene composition
FI96216C (en) 1994-12-16 1996-05-27 Borealis Polymers Oy Process for the preparation of polyethylene
PT837915E (en) 1995-07-10 2001-12-28 Borealis Tech Oy Coating composition
EP0905151A1 (en) 1997-09-27 1999-03-31 Fina Research S.A. Production of polyethylene having a broad molecular weight distribution
US6242548B1 (en) 1999-05-13 2001-06-05 Dyneon Llc Fluoroplastic polymers with improved characteristics
DE10259491A1 (en) 2002-12-19 2004-07-01 Basell Polyolefine Gmbh Polyethylene moulding material for production of blow-moulded containers comprises low-mol. wt. ethylene homopolymer, high-mol. wt. copolymer of ethylene and 4-8C olefin, and ultrahigh-mol. wt. ethylene copolymer
DE102004055587A1 (en) 2004-11-18 2006-05-24 Basell Polyolefine Gmbh Polyethylene molded mass, useful for the external covering of electro cables, comprises low molecular ethylene homopolymers, high molecular copolymers of ethylene and other 4-8C olefin and of ultrahigh molecular ethylene copolymer
DE102004055588A1 (en) 2004-11-18 2006-05-24 Basell Polyolefine Gmbh Polyethylene molded mass, useful for preparing protective coating for steel tubes, comprises low molecular ethylene homopolymers, high molecular copolymers of ethylene and other 4-8C olefin and of ultrahigh molecular ethylene copolymer

Patent Citations (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4336352A (en) * 1979-08-24 1982-06-22 Asahi Kasei Kogyo Kabushiki Kaisha Blend of three ethylene polymers
US4447587A (en) * 1981-06-20 1984-05-08 Hoechst Aktiengesellschaft Process for the preparation of a polyolefin, and a catalyst for this process
US4461873A (en) * 1982-06-22 1984-07-24 Phillips Petroleum Company Ethylene polymer blends
US4536550A (en) * 1983-04-21 1985-08-20 Asahi Kasei Kogyo Kabushiki Kaisha Polyethylene composition
US4859749A (en) * 1987-07-16 1989-08-22 Hoechst Aktiengesellschaft Process for the preparation of a polyolefin with a wide molecular mass distribution
US5242548A (en) * 1988-08-19 1993-09-07 Youngner Philip G Vacuum distillation apparatus
US5136924A (en) * 1990-01-26 1992-08-11 Sig Schweizerische Industrie-Gesellschaft Silencer for firearms
US5648309A (en) * 1990-06-01 1997-07-15 Hoechst Aktiengesellschaft Process for the preparation of a poly-1-olefin
US5338589A (en) * 1991-06-05 1994-08-16 Hoechst Aktiengesellschaft Polyethylene molding composition
US5576400A (en) * 1991-07-23 1996-11-19 Mitsubishi Kasei Corporation Process for producing olefin polymer
US5422400A (en) * 1991-10-25 1995-06-06 Maruzen Polymer Company, Ltd. Method for producing an ethylenic polymer composition
US5258161A (en) * 1992-06-15 1993-11-02 Union Carbide Chemicals & Plastics Technology Corporation Blown film extrusion
US6344522B1 (en) * 1992-12-21 2002-02-05 Solvay Polyolefins - Europe Belgium Process for the preparation of a composition containing ethylene polymers, composition containing ethylene polymers and use thereof
US6407185B1 (en) * 1992-12-21 2002-06-18 Solvay (Societe Anonyme) Process for the preparation of a composition containing ethylene polymers, composition containing ethylene polymers and use thereof
US5350807A (en) * 1993-06-25 1994-09-27 Phillips Petroleum Company Ethylene polymers
US5882750A (en) * 1995-07-03 1999-03-16 Mobil Oil Corporation Single reactor bimodal HMW-HDPE film resin with improved bubble stability
US6329054B1 (en) * 1995-07-10 2001-12-11 Borealis Polymers Oy Cable and method for using a cable-sheathing composition including an ethylene polymer mixture
US6156845A (en) * 1995-10-18 2000-12-05 Chisso Corporation Polyolefin composition and method of making
US6642323B1 (en) * 1998-05-08 2003-11-04 Borealis Technology Oy Process to produce a homogeneous polyethylene material
US6713561B1 (en) * 1999-09-24 2004-03-30 Basell Polyolefine Gmbh Polyethylene moulding compound with an improved ESCR/stiffness relation and an improved swelling rate, a method for the production thereof and the use thereof
US6248831B1 (en) * 1999-12-06 2001-06-19 Union Carbide Chemicals & Plastics Technology Corporation High strength polyethylene film
US6900266B2 (en) * 2001-06-14 2005-05-31 Solvay Polyolefins Europe-Belgium Method of compounding a multimodal polyethylene composition
US20030149180A1 (en) * 2001-08-17 2003-08-07 Dow Global Technologies Inc. Bimodal polyethylene composition and articles made therefrom
US20060155058A1 (en) * 2002-12-19 2006-07-13 Basell Polyolefine Gmbh Polyethylene blow molding composition for producing small containers
US20060052542A1 (en) * 2002-12-24 2006-03-09 Bassell Polyolefine Gmbh Polyethylene composition for producing l-ring drums
US20060074194A1 (en) * 2002-12-24 2006-04-06 Basell Polyolefine Gmbh Polyethylene blow molding composition for producing jerry cans
US20060074193A1 (en) * 2002-12-24 2006-04-06 Basell Polyolefine Gmbh Polyethylene blow molding composition for producing large containers
US7101629B2 (en) * 2003-12-05 2006-09-05 Univation Technologies, Llc Polyethylene films
US20060178482A1 (en) * 2005-02-07 2006-08-10 Kwalk Tae H Polyethylene blend compositions
US20080199674A1 (en) * 2005-03-01 2008-08-21 Basell Polyolefine Gmbh Polyethylene Molding Composition for Producing Blown Films Having Improved Mechanical Properties and Processability
US20090105422A1 (en) * 2005-08-25 2009-04-23 Basell Polyolefine Gmbh Multimodal polyethylene molding composition for producing pipes having improved mechanical properties

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Cornelia, Vasile and Mihaela Pascu. Practical Guide to Polyethylene. Rapra Technology Limited Edition. Published by iSmithers Rapra Publishing 2005. p 119. *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8633125B2 (en) 2004-04-26 2014-01-21 Basell Polyolefine Gmbh Catalyst composition for preparation of polyethylene
US9000095B2 (en) 2005-06-30 2015-04-07 Basell Polyolefine Gmbh Polyethylene molding composition for producing injection-molded finished parts
US20100010163A1 (en) * 2005-06-30 2010-01-14 Basell Polyolefine Gmbh Polyethylene Molding Composition for Producing Injection-Molded Finished Parts
US9051458B2 (en) 2005-08-25 2015-06-09 Basell Polyolefine Gmbh Multimodal polyethylene molding composition for producing pipes having improved mechanical properties
US20090105422A1 (en) * 2005-08-25 2009-04-23 Basell Polyolefine Gmbh Multimodal polyethylene molding composition for producing pipes having improved mechanical properties
US20090272721A1 (en) * 2005-09-28 2009-11-05 Tadahiro Ohmi Athmosphere-Controlled Bonding Apparatus, Bonding Method, and Electronic Device
US8722833B2 (en) 2006-12-22 2014-05-13 Basell Polyolefine Gmbh Multimodal polyethylene composition, mixed catalyst and process for preparing the composition
US20090306299A1 (en) * 2006-12-22 2009-12-10 Basell Polyolefine Gmbh Multimodal polyethylene composition, mixed catalyst and process for preparing the composition
US8501884B2 (en) 2007-04-13 2013-08-06 Basell Polyolefine Gmbh Polyethylene and catalyst composition and process for the preparation thereof
US9090719B2 (en) 2009-06-03 2015-07-28 Basell Polyolefine Gmbh Polyethylene composition and finished products made thereof
GB2498936A (en) * 2012-01-31 2013-08-07 Norner Innovation As Polyethylene with multi-modal molecular weight distribution
US9605092B2 (en) 2013-08-05 2017-03-28 Ineos Europe Ag Polymerisation process
US9963529B1 (en) 2017-04-19 2018-05-08 Nova Chemicals (International) S.A. Multi reactor solution polymerization

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Owner name: BASELL POLYOLEFINE GMBH,GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BERTHOLD, JOACHIM;HEINICKE, LUTZ-GERD;MEIER, GERHARDUS;REEL/FRAME:024211/0635

Effective date: 20070830

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION