DE10325483A1 - Polyethylene composition for producing small blow moldings, e.g. container, includes low-molecular-mass ethylene homopolymer, high-molecular-mass copolymer made from ethylene and olefin, and ultrahigh-molecular-mass ethylene copolymer - Google Patents
Polyethylene composition for producing small blow moldings, e.g. container, includes low-molecular-mass ethylene homopolymer, high-molecular-mass copolymer made from ethylene and olefin, and ultrahigh-molecular-mass ethylene copolymer Download PDFInfo
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- DE10325483A1 DE10325483A1 DE2003125483 DE10325483A DE10325483A1 DE 10325483 A1 DE10325483 A1 DE 10325483A1 DE 2003125483 DE2003125483 DE 2003125483 DE 10325483 A DE10325483 A DE 10325483A DE 10325483 A1 DE10325483 A1 DE 10325483A1
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- -1 Polyethylene Polymers 0.000 title claims abstract description 27
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 24
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 24
- 239000000203 mixture Substances 0.000 title claims abstract description 23
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 239000005977 Ethylene Substances 0.000 title claims abstract description 19
- 229920001577 copolymer Polymers 0.000 title claims abstract description 10
- 229920001038 ethylene copolymer Polymers 0.000 title claims abstract description 6
- 229920001519 homopolymer Polymers 0.000 title claims abstract description 5
- 150000001336 alkenes Chemical class 0.000 title claims description 4
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 title claims description 4
- 238000000071 blow moulding Methods 0.000 title description 6
- 150000001875 compounds Chemical class 0.000 claims abstract description 18
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000001257 hydrogen Substances 0.000 claims abstract description 12
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 12
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 9
- 239000003054 catalyst Substances 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 6
- 238000009826 distribution Methods 0.000 claims abstract description 6
- 239000000178 monomer Substances 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims abstract description 3
- 150000003623 transition metal compounds Chemical class 0.000 claims abstract description 3
- 238000000465 moulding Methods 0.000 claims description 29
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims description 12
- 239000000725 suspension Substances 0.000 claims description 5
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 claims description 4
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 claims description 3
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 230000008961 swelling Effects 0.000 claims description 2
- 239000000155 melt Substances 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000000375 suspending agent Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000002902 bimodal effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000011005 laboratory method Methods 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000006078 metal deactivator Substances 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010557 suspension polymerization reaction Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F10/02—Ethene
-
- 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
- C08F297/00—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer
- C08F297/06—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the coordination type
- C08F297/08—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the coordination type polymerising mono-olefins
- C08F297/083—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the coordination type polymerising mono-olefins the monomers being ethylene or propylene
- C08F297/086—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the coordination type polymerising mono-olefins the monomers being ethylene or propylene the block polymer contains at least three blocks
-
- 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—Polyethene
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2311/00—Use of natural products or their composites, not provided for in groups B29K2201/00 - B29K2309/00, as reinforcement
- B29K2311/10—Natural fibres, e.g. wool or cotton
-
- 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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft eine Polyethylen Formmasse mit multimodaler Molmassenverteilung, die sich besonders eignet zum Blasformen von Kleinhohlkörpern mit einem Fassungsvermögen im Bereich von 200 bis 2000 ml, und ein Verfahren zum Herstellen dieser Formmasse in Gegenwart eines katalytischen Systems aus Ziegler Katalysator und Cokatalysator über eine mehrstufige, aus aufeinanderfolgenden Flüssigphasenpolymerisationen bestehenden Reaktionsabfolge. Die Erfindung betrifft ferner aus der Formmasse durch Blasformen hergestellte Kleinhohlkörper.The The present invention relates to a polyethylene molding compound with multimodal Molar mass distribution, which is particularly suitable for blow molding Small hollow bodies with a capacity in Range from 200 to 2000 ml, and a method of making them Molding compound in the presence of a catalytic system made from Ziegler catalyst and Cocatalyst over a multi-stage, from successive liquid phase polymerizations existing reaction sequence. The invention further relates to the molding compound produced by blow molding.
Polyethylen wird in großem Umfang zur Herstellung von Formteilen aller Art verwendet, zu denen ein Werkstoff mit besonders hoher mechanischer Festigkeit, hoher Korrosionsbeständigkeit und absolut zuverlässiger Langzeitbeständigkeit benötigt wird. Polyethylen hat zudem den besonderen Vorteil, dass es daneben auch eine gute chemische Beständigkeit aufweist und ein geringes Eigengewicht besitzt.polyethylene will be great Scope used for the production of molded parts of all kinds, including one Material with particularly high mechanical strength, high corrosion resistance and absolutely reliable Long-term stability needed becomes. Polyethylene also has the particular advantage that it is wrong also has good chemical resistance and has a low weight.
Die
Ein
Werkstoff mit einer noch weiter verbreiterten Molmassenverteilung
ist in der
Die bekannten bimodalen Produkte zeichnen sich aber insbesondere durch eine relativ geringe Schmelzefestigkeit bei der Verarbeitung aus. Dabei kommt es immer wieder zum Aufreißen der Formteile im Schmelzezustand während der Verfestigung und damit zu unannehmbaren Instabilitäten im Extrusionsprozess. Ferner wird, insbesondere bei der Herstellung dickwandiger Behälter, eine Ungleichmäßigkeit der Wanddicke beobachtet, deren Ursache ein Abfließen der Schmelze vom oberen in räumlich tiefer gelegene untere Bereiche ist.The Known bimodal products are particularly characterized by a relatively low melt strength during processing. The molded parts repeatedly tear open in the molten state while solidification and thus unacceptable instabilities in the extrusion process. Furthermore, especially in the manufacture of thick-walled containers unevenness the wall thickness observed, the cause of which is a drainage of the Melt from the top in spatially lower lower areas.
Aufgabe der vorliegenden Erfindung war somit die Entwicklung einer Polyethylen Formmasse, mit der sich gegenüber allen bekannten Werkstoffen eine noch bessere Verarbeitung zu Kleinhohlkörpern nach dem Blasformverfahren ermöglichen lässt. Insbesondere soll die Formmasse durch ihre besonders hohe Schmelzefestigkeit einen stabilen Extrusionsprozess über eine lange Zeitdauer ermöglichen und durch ihre gezielt eingestellte Schwellrate eine optimale Wanddickensteuerung zulassen.task the present invention was thus the development of a polyethylene Molding compound with which to face each other all known materials even better processing into small hollow bodies allow the blow molding process leaves. In particular, the molding composition should have a particularly high melt strength enable a stable extrusion process over a long period of time and an optimal wall thickness control thanks to its specifically set threshold rate allow.
Ein Vorschlag für die Lösung dieser Aufgabe findet sich bereits in der noch nicht veröffentlichten deutschen Patentanmeldung Nr. 102 59 491.0.On Suggestion for the solution this task can already be found in the unpublished German Patent application No. 102 59 491.0.
Inzwischen wurde als weitere Lösung dieser Aufgabe eine Formmasse der eingangs genannten Gattung gefunden, deren Kennzeichenmerkmale darin zu sehen sind, dass sie 50 bis 58 Gew.-% eines niedermolekularen Ethylenhomopolymers A, 18 bis 22 Gew.-% eines hochmolekularen Copolymers B aus Ethylen und einem anderen Olefin mit 4 bis 8 C-Atomen und 22 bis 28 Gew.-% eines ultrahochmolekularen Ethylen-copolymers C enthält, wobei alle Prozentangaben bezogen sind auf das Gesamtgewicht der Formmasse.meanwhile was as another solution this task found a molding compound of the type mentioned, the distinguishing features of which can be seen in that they are 50 to 58 % By weight of a low molecular weight ethylene homopolymer A, 18 to 22 % By weight of a high molecular weight copolymer B of ethylene and one other olefin with 4 to 8 carbon atoms and 22 to 28 wt .-% of an ultra high molecular weight Contains ethylene copolymer C, where all percentages are based on the total weight of the Molding compound.
Die Erfindung betrifft ferner auch ein Verfahren zum Herstellen dieser Formmasse in kaskadierter Suspensionspolymerisation und Kleinhohlkörper mit einem Fassungsvermögen im Bereich von 200 bis 2000 ml aus dieser Formmasse mit ganz hervorragenden mechanischen Festigkeitseigenschaften.The The invention also relates to a method for producing the same Molding compound in cascaded suspension polymerization and small hollow body with a capacity in the range of 200 to 2000 ml from this molding compound with very excellent mechanical strength properties.
Die erfindungsgemäße Polyethylen Formmasse besitzt eine Dichte bei einer Temperatur von 23°C im Bereich von 0,955 bis 0,965 g/cm3 und eine breite trimodale Molmassenverteilung. Das hochmolekulare Copolymer B enthält nur geringe Anteile an weiteren Olefinmonomereinheiten mit 4 bis 8 C-Atomen, nämlich von 0,3 bis 0,6 Gew.-%. Beispiele für solche Comonomere sind 1-Buten, 1-Penten, 1-Hexen, 1-Octen oder 4-Methylpenten-1. Das ultrahochmolekulare Ethylenhomo- oder -copolymer C enthält ebenfalls eines oder mehrere der vorstehend genannten Comonomeren in einer Menge im Bereich von 1 bis 2 Gew.-%.The polyethylene molding composition according to the invention has a density at a temperature of 23 ° C. in the range from 0.955 to 0.965 g / cm 3 and a broad trimodal molecular weight distribution. The high molecular copolymer B contains only small amounts of further olefin monomer units with 4 to 8 carbon atoms, namely from 0.3 to 0.6% by weight. Examples of such comonomers are 1-butene, 1-pentene, 1-hexene, 1-octene or 4-methylpentene-1. The ultra-high molecular weight ethylene homo- or copolymer C also contains one or more of the above-mentioned comonomers in an amount in the range from 1 to 2% by weight.
Die erfindungsgemäße Formmasse besitzt ferner einen Schmelzflussindex gemäß ISO 1133, ausgedrückt als MFI190/5, im Bereich von 0,7 bis 1,6 dg/min oder, ausgedrückt als MFI190°C/6, im Bereich von 18 bis 25 dg/min.The molding composition according to the invention also has a melt flow index according to ISO 1133, expressed as MFI 190/5 , in the range from 0.7 to 1.6 dg / min or, expressed as MFI 190 ° C./6 , in the range from 18 to 25 dg / minute
Das Polyethylen wird durch Polymerisation der Monomeren in Suspension bei Temperaturen im Bereich von 70 bis 90°C, vorzugsweise von 80 bis 90°C, einem Druck im Bereich von 2 bis 10 bar und in Gegenwart eines hochaktiven Ziegler-Katalysators erhalten, der aus einer Übergangsmetallverbindung und einer aluminiumorganischen Verbindung zusammengesetzt ist.The Polyethylene is suspended by polymerizing the monomers at temperatures in the range from 70 to 90 ° C, preferably from 80 to 90 ° C, one Pressure in the range of 2 to 10 bar and in the presence of a highly active Obtained Ziegler catalyst, that of a transition metal compound and an organic aluminum compound is composed.
Die Polymerisation wird dreistufig, d.h. in drei hintereinander geschalteten Stufen geführt, wobei die Molmasse jeweils mit Hilfe von zudosiertem Wasserstoff geregelt wird.The polymerization has three stages, ie three successively connected stages, the molar mass being regulated with the aid of added hydrogen.
Die erfindungsgemäße Polyethylen Formmasse kann neben dem Polyethylen noch weitere Zusatzstoffe enthalten. Solche Zusatzstoffe sind beispielsweise Wärmestabilisatoren, Antioxidantien, UV-Absorber, Lichtschutzmittel, Metalldesaktivatoren, peroxidzerstörende Verbindungen, basische Costabilisatoren in Mengen von 0 bis 10 Gew.-%, vorzugsweise 0 bis 5 Gew.-%, aber auch Füllstoffe, Verstärkungsmittel, Weichmacher, Gleitmittel, Emulgatoren, Pigmente, optische Aufheller, Flammschutzmittel, Antistatika, Treibmittel oder Kombinationen von diesen in Gesamtmengen von 0 bis 50 Gew.-%, bezogen auf das Gesamtgewicht der Mischung.The polyethylene according to the invention Molding compound can contain other additives in addition to the polyethylene. Such additives are, for example, heat stabilizers, antioxidants, UV absorbers, Light stabilizers, metal deactivators, peroxide-destroying compounds, basic costabilizers in amounts of 0 to 10% by weight, preferably 0 to 5% by weight, but also fillers, reinforcing agents, Plasticizers, lubricants, emulsifiers, pigments, optical brighteners, Flame retardants, antistatic agents, blowing agents or combinations of these in total amounts of 0 to 50 wt .-%, based on the total weight the mixture.
Die erfindungsgemäße Formmasse eignet sich besonders gut zur Herstellung von Kleinhohlkörpern nach dem Blasformverfahren, indem die Polyethylen Formmasse zunächst in einem Extruder bei Temperaturen im Bereich von 200 bis 250°C plastifiziert und dann durch eine Düse in eine Blasform ausgepresst und dort abgekühlt wird.The Molding composition according to the invention is particularly well suited for the production of small hollow bodies the blow molding process, in which the polyethylene molding compound is initially in plasticized in an extruder at temperatures in the range of 200 to 250 ° C. and then through a nozzle pressed into a blow mold and cooled there.
Die erfindungsgemäße Formmasse lässt sich besonders gut nach dem Blasformverfahren zu Kleinhohlkörpern verarbeiten, weil sie eine Schwellrate im Bereich von 115 bis 130% besitzt, und die damit hergestellten Kleinhohlkörper weisen besonders hohe mechanische Festigkeit auf, weil die erfindungsgemäße Formmasse eine Kerbschlagzähigkeit (ISO) im Bereich von 8 bis 14 kJ/m2 und eine Spannungsrissfestigkeit (FNCT) im Bereich von 7 bis 15 h besitzt.The molding composition according to the invention can be processed particularly well into small hollow bodies by the blow molding process because it has a swelling rate in the range from 115 to 130%, and the small hollow bodies produced therewith have particularly high mechanical strength because the molding composition according to the invention has a notched impact strength (ISO) in the range from 8 to 14 kJ / m 2 and has a stress crack resistance (FNCT) in the range from 7 to 15 h.
Die KerbschlagzähigkeitISO wird nach der ISO 179-1/1eA/DIN 53453 bei –30°C gemessen. Die Dimension der Probe beträgt 10 × 4 × 80 mm, wobei eine V-Kerbe mit einem Winkel von 45°, einer Tiefe von 2 mm und einem Kerbgrundradius von 0,25 mm eingenutet wird.The impact strength ISO is measured according to ISO 179-1 / 1eA / DIN 53453 at –30 ° C. The dimension of the sample is 10 × 4 × 80 mm, whereby a V-notch with an angle of 45 °, a depth of 2 mm and a notch base radius of 0.25 mm is grooved.
Die
Spannungsrissfestigkeit der erfindungsgemäßen Formmasse wird nach einer
internen Messmethode ermittelt und in h angegeben. Diese Labormethode
ist von M. Fleißner
in Kunststoffe 77 (1987), S. 45 ff, beschrieben und entspricht der
inzwischen geltenden ISO/CD 16770. Die Publikation zeigt, dass zwischen
der Bestimmung des langsamen Risswachstums im Zeitstandversuch an
rundum gekerbten Probestäben
und dem spröden
Ast der Zeitstandsinnendruckprüfung
nach ISO 1167 ein Zusammenhang besteht. Eine Verkürzung der
Zeit bis zum Versagen wird durch die Verkürzung der Rissinitiierungszeit
durch die Kerbe (1,6 mm/Rasierklinge) in Ethylenglykol als spannungsrissförderndem
Medium bei einer Temperatur von 80°C und einer Zugspannung von
3,5 MPa erreicht. Die Probenherstellung erfolgt, indem drei Probekörper mit
den Abmessungen 10 × 10 × 90 mm
aus einer 10 mm dicken Pressplatte herausgesägt werden. Die Probekörper werden
rundum mit einer Rasierklinge in einer eigens dafür angefertigten
Kerbvorrichtung (siehe
Beispiel 1example 1
Die Polymerisation von Ethylen wurde in einem kontinuierlichen Verfahren in drei hintereinander in Serie geschalteten Reaktoren betrieben. In den ersten Reaktor wurde ein Ziegler Katalysator, der nach der Vorschrift der WO 91/18934, Beispiel 2, hergestellt wurde und in der WO die Operations-Nummer 2.2 hat, in einer Menge von 0,08 mmol/h eingespeist, zusätzlich ausreichend Suspensionsmittel (Hexan), Ethylen und Wasserstoff. Die Menge an Ethylen (= 75,6 kg/h) und die Menge an Wasserstoff (= 68 g/h) wurden so eingestellt, dass im Gasraum des ersten Reaktors ein prozentualer Anteil von 25 bis 26 Vol.-% Ethylen und ein prozentualer Anteil von 65 Vol.-% Wasserstoff gemessen wurden, der Rest war ein Gemisch aus Stickstoff und verdampftem Suspensionsmittel.The Polymerization of ethylene was carried out in a continuous process operated in three reactors connected in series. A Ziegler catalyst was installed in the first reactor Regulation of WO 91/18934, Example 2, was prepared and in WO has operation number 2.2, in an amount of 0.08 mmol / h fed, additionally sufficient suspending agent (hexane), ethylene and hydrogen. The amount of ethylene (= 75.6 kg / h) and the amount of hydrogen (= 68 g / h) were set so that in the gas space of the first reactor a percentage of 25 to 26 vol .-% ethylene and a percentage Proportion of 65 vol .-% hydrogen were measured, the rest was a Mixture of nitrogen and evaporated suspending agent.
Die Polymerisation in dem ersten Reaktor wurde bei einer Temperatur von 84°C durchgeführt.The Polymerization in the first reactor was at a temperature of 84 ° C carried out.
Die Suspension aus dem ersten Reaktor wurde danach in einen zweiten Reaktor überführt in dem der prozentuale Anteil an Wasserstoff im Gasraum auf 7 bis 9 Vol.-% reduziert war und in den neben einer Menge von 28 kg/h an Ethylen zusätzlich eine Menge von 120 g/h an 1-Buten zugegeben wurden. Die Reduzierung der Menge an Wasserstoff erfolgte über eine H2-Zwischenentspannung. Im Gasraum des zweiten Reaktors wurden 73 Vol.-% Ethylen, 8 Vol.-% Wasserstoff und 0,82 Vol.-% 1-Buten gemessen, der Rest war ein Gemisch aus Stickstoff und verdampftem Suspensionsmittel.The suspension from the first reactor was then transferred to a second reactor in which the percentage of hydrogen in the gas space was reduced to 7 to 9% by volume and in addition to an amount of 28 kg / h of ethylene an amount of 120 g / h of 1-butene were added. The amount of hydrogen was reduced by means of an intermediate H 2 relaxation. 73% by volume of ethylene, 8% by volume of hydrogen and 0.82% by volume of 1-butene were measured in the gas space of the second reactor, the rest being a mixture of nitrogen and evaporated suspending agent.
Die Polymerisation in dem zweiten Reaktor wurde bei einer Temperatur von 83°C durchgeführt.The Polymerization in the second reactor was at one temperature of 83 ° C carried out.
Die Suspension aus dem zweiten Reaktor wurde über eine weitere H2-Zwischenentspannung, mit der die Menge an Wasserstoff in dem Gasraum im dritten Reaktor auf 2,5 Vol.-% eingestellt wurde, in den dritten Reaktor überführt.The suspension from the second reactor was transferred to the third reactor via a further H 2 intermediate relaxation, with which the amount of hydrogen in the gas space in the third reactor was adjusted to 2.5% by volume.
In den dritten Reaktor wurde neben einer Menge von 36 kg/h an Ethylen zusätzlich eine Menge von 420 g/h 1-Buten eingegeben. Im Gasraum des dritten Reaktors wurde ein prozentualer Anteil an Ethylen von 87 Vol.-%, ein prozentualer Anteil von Wasserstoff von 2,5 Vol.-% und ein prozentualer Anteil von 1-Buten von 1,2 Vol.-% gemessen, der Rest war ein Gemisch aus Stickstoff und verdampftem Suspensionsmittel.In addition to an amount of 36 kg / h of ethylene, an amount of 420 g / h of 1-butene was also introduced into the third reactor. A percentage of ethylene of 87% by volume, a percentage of hydrogen of 2.5% by volume and a percentage of 1-butene of 1.2% by volume were measured in the gas space of the third reactor The rest was a mixture of nitrogen and evaporated Suspending agent.
Die Polymerisation in dem dritten Reaktor wurde bei einer Temperatur von 83°C durchgeführt.The Polymerization in the third reactor was at one temperature of 83 ° C carried out.
Die für die vorstehend beschriebene, kaskadierte Fahrweise erforderliche Langzeitaktivität des Polymerisationskatalysators wurde durch einen speziell entwickelten Ziegler Katalysator mit der in der eingangs genannten WO angegebenen Zusammensetzung gewährleistet. Ein Maß für die Tauglichkeit dieses Katalysators ist seine extrem hohe Wasserstoffansprechbarkeit und seine über eine lange Zeitdauer von 1 bis 8 h gleichbleibend hohe Aktivität.The for the The cascaded procedure described above requires long-term activity of the polymerization catalyst was developed using a specially developed Ziegler catalyst guaranteed the composition specified in the aforementioned WO. A measure of the suitability of this Its extremely high hydrogen responsiveness and catalyst its about a consistently high activity for a long period of 1 to 8 h.
Die den dritten Reaktor verlassende Polymersuspension wird nach Abtrennen des Suspensionsmittels und Trocknen des Pulvers der Granulierung zugeführt.The polymer suspension leaving the third reactor is after separation the suspending agent and drying the powder of the granulation fed.
Die nach Beispiel 1 hergestellte Polyethylen Formmasse hatte eine Dichte von 0,959 g/cm3. Die für die Formmasse geltenden Mengenanteile wA, wB und wC an Polymer A, B und C und ihre physikalischen Eigenschaften sind in der nachfolgend aufgeführten Tabelle 1 angegeben. Tabelle 1 The polyethylene molding composition prepared according to Example 1 had a density of 0.995 g / cm 3 . The proportions w A , w B and w C of polymer A, B and C applicable to the molding composition and their physical properties are given in Table 1 below. Table 1
Die Abkürzungen der physikalischen Eigenschaften in der Tabelle 2 haben die folgende Bedeutung:
- – SR (= Schwellrate) in [%] gemessen in einem Hochdruckkapillarrheometer bei einer Scherrate von 1440 l/s in einer 2/2 Rundlochdüse mit einem konischen Einlauf (Winkel = 15°) bei einer Temperatur von 190°C.
- – FNCT = Spannungsrisbeständigkeit (Full Notch Creep Test) gemessen nach der internen Messmethode nach M. Fleißner in [h],
- – KSZISO = Kerbschlagzähigkeit, gemessen nach ISO 179-1/1eA/DIN 53453 in [kJ/m2] bei –30°C,
- - SR (= swell rate) in [%] measured in a high pressure capillary rheometer at a shear rate of 1440 l / s in a 2/2 round hole nozzle with a conical inlet (angle = 15 °) at a temperature of 190 ° C.
- - FNCT = resistance to stress cracking (full notch creep test) measured according to the internal measurement method according to M. Fleißner in [h],
- - KSZ ISO = impact strength, measured according to ISO 179-1 / 1eA / DIN 53453 in [kJ / m 2 ] at –30 ° C,
Claims (6)
Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
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DE2003125483 DE10325483A1 (en) | 2002-12-19 | 2003-06-04 | Polyethylene composition for producing small blow moldings, e.g. container, includes low-molecular-mass ethylene homopolymer, high-molecular-mass copolymer made from ethylene and olefin, and ultrahigh-molecular-mass ethylene copolymer |
US10/537,728 US7427649B2 (en) | 2002-12-19 | 2003-12-06 | Polyethylene blow molding composition for producing small containers |
ES03789164T ES2268469T3 (en) | 2002-12-19 | 2003-12-06 | COMPOSITION OF POLYETHYLENE FOR MOLDING BY BLOWING INTENDED FOR THE PRODUCTION OF SMALL CONTAINERS. |
PCT/EP2003/013868 WO2004056921A1 (en) | 2002-12-19 | 2003-12-06 | Polyethylene blow molding composition for producing small containers |
AT03789164T ATE332936T1 (en) | 2002-12-19 | 2003-12-06 | POLYETHYLENE CASTING COMPOSITION FOR MAKING CONTAINERS BY BLOW MOLDING AND SMALL BLOW MOLDINGS PRODUCED THEREFROM |
BRPI0316920-0A BR0316920B1 (en) | 2002-12-19 | 2003-12-06 | polyethylene composition, and process for the production and use thereof. |
PL377716A PL377716A1 (en) | 2002-12-19 | 2003-12-06 | Polyethylene blow molding composition for producing small containers |
EP03789164A EP1576047B1 (en) | 2002-12-19 | 2003-12-06 | Polyethylene blow molding composition for producing small containers |
AU2003293792A AU2003293792A1 (en) | 2002-12-19 | 2003-12-06 | Polyethylene blow molding composition for producing small containers |
DE60306808T DE60306808T2 (en) | 2002-12-19 | 2003-12-06 | POLYETHYLENE FORMING TO MANUFACTURE CONTAINERS THROUGH BLOW SHAPES AND SMALL-HOLLOW BASKETS MANUFACTURED THEREIN |
KR1020057010515A KR20050088310A (en) | 2002-12-19 | 2003-12-06 | Polyethylene blow moulding composition for producing small containers |
CA002510063A CA2510063A1 (en) | 2002-12-19 | 2003-12-06 | Polyethylene blow molding composition for producing small containers |
JP2005502534A JP2006511676A (en) | 2002-12-19 | 2003-12-06 | Polyethylene blow molding composition for manufacturing small containers |
ARP030104760A AR042638A1 (en) | 2002-12-19 | 2003-12-19 | COMPOSITION OF POLYETHYLENE TO MOLD BY BLOWING TO PRODUCE SMALL CONTAINERS |
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DE10259491A DE10259491A1 (en) | 2002-12-19 | 2002-12-19 | 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 |
DE2003125483 DE10325483A1 (en) | 2002-12-19 | 2003-06-04 | Polyethylene composition for producing small blow moldings, e.g. container, includes low-molecular-mass ethylene homopolymer, high-molecular-mass copolymer made from ethylene and olefin, and ultrahigh-molecular-mass ethylene copolymer |
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DE2003125483 Ceased DE10325483A1 (en) | 2002-12-19 | 2003-06-04 | Polyethylene composition for producing small blow moldings, e.g. container, includes low-molecular-mass ethylene homopolymer, high-molecular-mass copolymer made from ethylene and olefin, and ultrahigh-molecular-mass ethylene copolymer |
DE60306808T Expired - Lifetime DE60306808T2 (en) | 2002-12-19 | 2003-12-06 | POLYETHYLENE FORMING TO MANUFACTURE CONTAINERS THROUGH BLOW SHAPES AND SMALL-HOLLOW BASKETS MANUFACTURED THEREIN |
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DE60306808T Expired - Lifetime DE60306808T2 (en) | 2002-12-19 | 2003-12-06 | POLYETHYLENE FORMING TO MANUFACTURE CONTAINERS THROUGH BLOW SHAPES AND SMALL-HOLLOW BASKETS MANUFACTURED THEREIN |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2009003626A1 (en) * | 2007-07-05 | 2009-01-08 | Basell Polyolefine Gmbh | Pe molding composition for blow-molding of small low-density blow moldings |
WO2009003627A1 (en) * | 2007-07-05 | 2009-01-08 | Basell Polyolefine Gmbh | Pe molding composition for blow-molding of small low-density blow moldings |
-
2003
- 2003-06-04 DE DE2003125483 patent/DE10325483A1/en not_active Ceased
- 2003-12-06 DE DE60306808T patent/DE60306808T2/en not_active Expired - Lifetime
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2009003626A1 (en) * | 2007-07-05 | 2009-01-08 | Basell Polyolefine Gmbh | Pe molding composition for blow-molding of small low-density blow moldings |
WO2009003627A1 (en) * | 2007-07-05 | 2009-01-08 | Basell Polyolefine Gmbh | Pe molding composition for blow-molding of small low-density blow moldings |
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DE60306808D1 (en) | 2006-08-24 |
AR042638A1 (en) | 2005-06-29 |
DE60306808T2 (en) | 2007-02-22 |
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