EP4587491A1 - Composition de polyéthylène pour moulage par soufflage ayant un comportement de gonflement amélioré - Google Patents

Composition de polyéthylène pour moulage par soufflage ayant un comportement de gonflement amélioré

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Publication number
EP4587491A1
EP4587491A1 EP23771832.5A EP23771832A EP4587491A1 EP 4587491 A1 EP4587491 A1 EP 4587491A1 EP 23771832 A EP23771832 A EP 23771832A EP 4587491 A1 EP4587491 A1 EP 4587491A1
Authority
EP
European Patent Office
Prior art keywords
polyethylene composition
mif
mie
weight
equal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23771832.5A
Other languages
German (de)
English (en)
Inventor
Ulf Schueller
Sebastian Wilhelm
Harald Schmitz
Bernd Lothar Marczinke
Andreas Maus
Elke Damm
Gerhardus Meier
Eric D. Day
Sameer D. Mehta
Harilaos Mavridis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Basell Polyolefine GmbH
Original Assignee
Basell Polyolefine GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US17/945,336 external-priority patent/US20240093010A1/en
Application filed by Basell Polyolefine GmbH filed Critical Basell Polyolefine GmbH
Publication of EP4587491A1 publication Critical patent/EP4587491A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/001—Multistage polymerisation processes characterised by a change in reactor conditions without deactivating the intermediate polymer
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00—Polymerisation catalysts
    • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
    • C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
    • C08F4/62—Refractory metals or compounds thereof
    • C08F4/64—Titanium, zirconium, hafnium or compounds thereof
    • C08F4/646—Catalysts comprising at least two different metals, in metallic form or as compounds thereof, in addition to the component covered by group C08F4/64
    • C08F4/6465—Catalysts comprising at least two different metals, in metallic form or as compounds thereof, in addition to the component covered by group C08F4/64 containing silicium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00—Polymerisation catalysts
    • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
    • C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
    • C08F4/62—Refractory metals or compounds thereof
    • C08F4/64—Titanium, zirconium, hafnium or compounds thereof
    • C08F4/647—Catalysts containing a specific non-metal or metal-free compound
    • C08F4/649—Catalysts containing a specific non-metal or metal-free compound organic
    • C08F4/6491—Catalysts containing a specific non-metal or metal-free compound organic hydrocarbon
    • C08F4/6492—Catalysts containing a specific non-metal or metal-free compound organic hydrocarbon containing aliphatic unsaturation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00—Polymerisation catalysts
    • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
    • C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
    • C08F4/62—Refractory metals or compounds thereof
    • C08F4/64—Titanium, zirconium, hafnium or compounds thereof
    • C08F4/65—Pretreating the metal or compound covered by group C08F4/64 before the final contacting with the metal or compound covered by group C08F4/44
    • C08F4/651—Pretreating with non-metals or metal-free compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00—Polymerisation catalysts
    • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
    • C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
    • C08F4/62—Refractory metals or compounds thereof
    • C08F4/64—Titanium, zirconium, hafnium or compounds thereof
    • C08F4/65—Pretreating the metal or compound covered by group C08F4/64 before the final contacting with the metal or compound covered by group C08F4/44
    • C08F4/652—Pretreating with metals or metal-containing compounds
    • C08F4/654—Pretreating with metals or metal-containing compounds with magnesium or compounds thereof
    • C08F4/6543—Pretreating with metals or metal-containing compounds with magnesium or compounds thereof halides of magnesium
    • C08F4/6545—Pretreating with metals or metal-containing compounds with magnesium or compounds thereof halides of magnesium and metals of C08F4/64 or compounds thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/14—Peroxides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions 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
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethylene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions 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
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms
    • C08L23/0815—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms with aliphatic 1-olefins containing one carbon-to-carbon double bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
    • C08F2500/04—Broad molecular weight distribution, i.e. Mw/Mn > 6
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
    • C08F2500/07—High density, i.e. > 0.95 g/cm3
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
    • C08F2500/09—Long chain branches
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
    • C08F2500/12—Melt flow index or melt flow ratio
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
    • C08F2500/13—Environmental stress cracking resistance
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
    • C08F2500/14—Die swell or die swell ratio or swell ratio
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
    • C08F2500/17—Viscosity
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
    • C08F2500/27—Amount of comonomer in wt% or mol%
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
    • C08F2500/39—Tensile storage modulus E'; Shear storage modulus G'; Tensile loss modulus E''; Shear loss modulus G''; Tensile complex modulus E*; Shear complex modulus G*
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2810/00—Chemical modification of a polymer
    • C08F2810/20—Chemical modification of a polymer leading to a crosslinking, either explicitly or inherently
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2308/00—Chemical blending or stepwise polymerisation process with the same catalyst
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2314/00—Polymer mixtures characterised by way of preparation
    • C08L2314/02—Ziegler natta catalyst

Definitions

  • POLYETHYLENE COMPOSITION FOR BLOW MOLDING HAVING AN IMPROVED SWELL BEHAVIOR FIELD OF THE INVENTION [0001] The present disclosure relates to a polyethylene composition which is suitable for producing small articles by blow molding.
  • US 2022/0048016A1 relates to mixed catalyst systems comprising a group 4 bis(phenolate) complex and a 2,6-bis(imino)pyridyl iron complex, polyolefins, such polyethylene, compositions made therefrom and articles made therefrom.
  • US 2013/0085244 A1 the preparation of long chain branching in high density polyethylene by using metallocene catalysts is disclosed.
  • the WO 2007/015927 A1 discloses various processes including continuous fluidized-bed gas-phase polymerization processes for making a high strength and high density polyethylene copolymer.
  • a method of modifying a polyethylene is disclosed. In the method ethylene or a mixture of ethylene and a C3-C10 a-olefin is polymerized in an organic solvent with a Ziegler or single-site catalyst to form an initial polyethylene solution.
  • the WO 2016/141020 A1 relates to catalysts comprising two heterogeneous chromium catalysts for the polymerization of olefins.
  • compositions suited for the said use are disclosed in WO2018095700, WO2018095701 and WO2018095702.
  • Said compositions due to a proper selection of their molecular structure and rheological behavior, achieve a particularly high Environmental Stress Cracking Resistance (ESCR) in a broad density range, in combination with an extremely smooth surface of the final article, with reduced gel content.
  • ESCR Environmental Stress Cracking Resistance
  • a critical aspect of blow molding which may require optimization, is the swelling behavior of the polymer composition.
  • the overall quality level and quality consistence of the blow molded article strongly depend upon swelling.
  • FR7382C 1 For instance, in extrusion blow molding the parison swell is of high importance. [0013] The parison swell has two components: weight swell and diameter swell. [0014] Weight swell can occur during the short time the molds are open and the parisons are dropping. The parisons may actually shrink in length and concurrently their walls thicken and become heavier. [0015] A too high weight swell should be avoided, especially for the production of blown articles with thin, constant wall thickness and low weight. Die adjustments could be critical. [0016] If the resin used has too high a weight swell, an attempt is often made to reduce weight by decreasing the die gap.
  • the precursor polyethylene composition (I) has the following additional features: 2 I ) MIF from 20 to 50 g/10 min., preferably from 25 to 45 g/10 min.; 3 I ) density from 0.948 to 0.955 g/cm 3 , in particular from 0.950 to 0.954 g/cm 3 ; 4 I ) ER values from 2 to 4, preferably from 2 to 3.5.
  • the ratio 4)/4 I ), which is between the ER 4) of the final polyethylene composition (after contacting with the radical initiator) and the ER 4 I ) of the precursor polyethylene composition (I), is from 1.1 to 2.5.
  • the expression “polyethylene composition” is intended to embrace, as alternatives, both a single ethylene polymer and an ethylene polymer composition, in particular a FR7382C 4 composition of two or more ethylene polymer components, preferably with different molecular weights, such composition being also called “bimodal” or “multimodal” polymer in the relevant art.
  • the present polyethylene composition consists of or comprises one or more ethylene copolymers.
  • Suitable types of additives for preparing polyethylene compositions are, for example, antioxidants, melt stabilizers, light stabilizers, acid scavengers, lubricants, processing aids, antiblocking agents, slip agents, antistatic agents, antifogging agents, pigments or dyes, nucleating agents, flame retardants or fillers. It is common that several additives are added. The multiple additives can be different types of additives. It is however also possible that several representatives of one type of additives are added to the polyethylene composition. Additives of all these types are generally commercially available and are described, for example, in Hans Zweifel, Plastics Additives Handbook, 5th Edition, Kunststoff, 2001.
  • the molecular weight calibration was established by using monodisperse polystyrene (PS) standards from Polymer Laboratories (now Agilent Technologies, Reifenberger Str. 130, 71034 Boeblingen, Germany)) in the range from 580g/mol up to 11600000g/mol and additionally with Hexadecane. [0144] The calibration curve was then adapted to Polyethylene (PE) by means of the Universal Calibration method (Benoit H., Rempp P. and Grubisic Z., & in J. Polymer Sci., Phys. Ed., 5, 753(1967)).
  • LCBI Long Chain Branching index
  • the LCB Index is determined as described in the following.
  • ER is determined by the method of R. Shroff and H. Mavridis, "New Measures of Polydispersity from Rheological Data on Polymer Melts," J. Applied Polymer Science 57 (1995) 1605 (see also U.S. Pat. No.
  • the sample is heated with 20K/min up to 200 °C and cooled down also with 20K/min to the test temperature, in order to erase the thermal history.
  • the isothermal test begins immediately after and the time is recorded until crystallization occurs.
  • the time interval until the crystallization heat flow maximum (peak), tmaxDSC, is determined using the vendor software (TA Instruments).
  • the melt viscosity ⁇ 0.02 value is multiplied by the tmaxDSC value and the product is normalized by a factor of 100000 (10 ⁇ 5).
  • Weight swell and Diameter swell (Uniloy test) [0166] The determination of weight and diameter swell was carried out by simulating industrial process conditions with a Uniloy reciprocating type blow molding machine model 5630, with a 1 gallon center fill bottle mold with an approximate parison drop time of 1.1s. [0167] Weight swell was determined by adjusting the bottle weight to the desired amount, 90 g, with the reference resin Petrothene LR732002 and then comparing to the weight of a bottle of the resin being examined, produced under the same machine parameters. [0168] Thus the weight swell is given by: W B -90 wherein WB is the weight of the tested bottle, in grams.
  • Diameter swell was determined by measuring the length of the flash on the bottle via graduated markings, from top (including the protruding top flash) down to and along the bottle handle at the same bottle weight as the reference resin, namely 90 g. The mold relative to the parison was adjusted so that the reference resin top flash edge fell on the 9 cm mark on the handle. [0170] The machine parameters were: Motor load/AMP. – ⁇ 40 amps; Screw speed – ⁇ 370 rpm (adjusted to adjust parison tail length); Hyd.
  • the said reference resin Petrothene LR732002 is an ethylene polymer produced with a Cr catalyst, having FNCT 6 MPa / 50°C, measured as previously described, of about 0.4 hours.
  • Other features of Petrothene LR732002 are: Density: 0.953 g/cm 3 ; MIF: 36 g/10 min; MIF/MIE: 100; ER: 5.4.
  • the diameter swell was considered satisfactory when falling within the range of 8 to 10 cm.
  • Cast Film Measurement [0174] The Film measurement of gels was carried out on an OCS extruder type ME 202008-V3 with 20 mm screw diameter and a screw length of 25 D with a slit die width of 150 mm.
  • the cast line is equipped with a chill roll and winder (model OCS CR-9).
  • the optical equipment consists of a OSC film surface analyzer camera, model FTA-100 (flash camera system) with a resolution of 26 ⁇ m x 26 ⁇ m. After purging the resin first for 1 hour to stabilize the extrusion conditions, inspection and value recording take place for 30 minutes afterwards.
  • the resin was extruded at 220°C with a take-off speed of ca.2.7 m/min to generate a film with thickness 50 ⁇ m.
  • the chill roll temperature was 70°C.
  • the said inspection with the surface analyzer camera provided the total content of gels and the content of gels with diameter of higher than 450 ⁇ m, as reported in Tables 1 to 3.
  • Comonomer content [0178] The comonomer content is determined by means of IR in accordance with ASTM D 6248 98, using an FT-IR spectrometer Tensor 27 from Bruker, calibrated with a chemometric model for determining butyl- side-chains in PE for hexene as comonomer.
  • TNOA tri-n-octylaluminum
  • CMMS cyclohexylmethyl-dimethoxysilane

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  • Chemical & Material Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Chemical & Material Sciences (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

Composition de polyéthylène particulièrement adaptée à la fabrication d'articles creux moulés par soufflage, présentant les caractéristiques suivantes : 1) densité de 0,948 à 0,955 g/cm 3 ; 2) rapport MIF/MIE de 60 à 120 ; 3) MIF de 15 à 45 g/10 min ; 4) valeurs ER de 2 à 5,0 ; ladite composition pouvant être obtenue par mise en contact d'une composition de polyéthylène précurseur avec un initiateur radicalaire.
EP23771832.5A 2022-09-15 2023-09-13 Composition de polyéthylène pour moulage par soufflage ayant un comportement de gonflement amélioré Pending EP4587491A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US17/945,336 US20240093010A1 (en) 2022-09-15 2022-09-15 Polyethylene composition for blow molding having an improved swell behavior
EP22196048 2022-09-16
PCT/EP2023/075136 WO2024056729A1 (fr) 2022-09-15 2023-09-13 Composition de polyéthylène pour moulage par soufflage ayant un comportement de gonflement amélioré

Publications (1)

Publication Number Publication Date
EP4587491A1 true EP4587491A1 (fr) 2025-07-23

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EP23771832.5A Pending EP4587491A1 (fr) 2022-09-15 2023-09-13 Composition de polyéthylène pour moulage par soufflage ayant un comportement de gonflement amélioré

Country Status (7)

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EP (1) EP4587491A1 (fr)
JP (1) JP2025529119A (fr)
KR (1) KR20250061763A (fr)
CN (1) CN119768443A (fr)
CA (1) CA3266797A1 (fr)
MX (1) MX2025002676A (fr)
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WO2024056729A1 (fr) 2024-03-21
KR20250061763A (ko) 2025-05-08
JP2025529119A (ja) 2025-09-04
CA3266797A1 (fr) 2024-03-21
CN119768443A (zh) 2025-04-04

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