WO2013122484A1 - Fabrication method of pentalayer polyolefin stretch film - Google Patents

Fabrication method of pentalayer polyolefin stretch film Download PDF

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Publication number
WO2013122484A1
WO2013122484A1 PCT/PL2012/000079 PL2012000079W WO2013122484A1 WO 2013122484 A1 WO2013122484 A1 WO 2013122484A1 PL 2012000079 W PL2012000079 W PL 2012000079W WO 2013122484 A1 WO2013122484 A1 WO 2013122484A1
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WIPO (PCT)
Prior art keywords
mfr
copolymer
ethylene
hexene
sheet die
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PCT/PL2012/000079
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French (fr)
Inventor
Sławomir SZELIGA
Aneta SZELIGA
Maciej Heneczkowski
Mariusz Oleksy
Grzegorz BUDZIK
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Zakład Produkcji Folii Efekt Sp. Z.O.O
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Priority to DE112012005884.4T priority Critical patent/DE112012005884B4/en
Publication of WO2013122484A1 publication Critical patent/WO2013122484A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • 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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B32B27/205—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents the fillers creating voids or cavities, e.g. by stretching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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 more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0616—VLDPE, i.e. very low density polyethylene
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0633—LDPE, i.e. low density polyethylene
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/008—Wide strips, e.g. films, webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/05—5 or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised 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
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised 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
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised 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
    • C08J2423/10—Homopolymers or copolymers of propene
    • 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
    • C08L2314/00—Polymer mixtures characterised by way of preparation
    • C08L2314/06—Metallocene or single site catalysts

Abstract

The matter of invention is the fabrication method of stretch pentalayer polyolefin film, in particular the plane film. the fabrication method of stretch pentalayer polyolefin film composed of following substrates: low density polyethylene, very low density polyethylene and metalocene linear polyethylene of low density, with the use of screw extruders feeding sheet die characteristic of that: - the copolymer of ethylene and n-hexene of mass flow rate (MFR) 1.0 to 6.0 g/10min; the best 4.0 g/min, was introduced to the first extruder feeding sheet die, used for the formation of first layer of thickness corresponding to 10-12% of total film thickness, - the mixture of copolymer of ethylene and n-hexene of MFR 1.0 to 6.0 g/10min; the best 4.0 g/min with copolymer of ethylene and n-hexene obtained in presence of metalocene catalyst, with MFR 1.0 to 6.0 g/10min; the best 4.0 g/min, in proportions 20-80% of the former; the best 50%, was introduced to the second extruder feeding sheet die, used for the formation of second layer of thickness corresponding to 28-32% of total film thickness, - the copolymer analogous to that introduced to first extruder, was introduced into third extruder feeding sheet die, used for the formation of third layer of thickness corresponding to 14-18% of total film thickness, - the mixture of copolymer of ethylene and n-hexene of MFR 1.0 to 6.0 g/10min, consisting 20-80%o contribution; the best 60% with polypropylene of MFR 2.0 to 6.0 g/10min, consisting 80-20% contribution; the best 40%, was introduced to the fourth extruder feeding sheet die, used for the formation of fourth layer of thickness corresponding to 28-32% of total film thickness, - the mixture of copolymer of ethylene and n-hexene of MFR 1.0 to 6.0 g/10min, consisting 40-95%) contribution; the best 80%, with copolymer of ethylene and n- hexene obtained in presence of metalocene catalyst, of MFR 1.0 to 6.0 g/10min, consisting 60-5% contribution; the best 20%, was introduced to the fifth extruder feeding sheet die. The temperature of sheet and separator was 260 °C.

Description

Fabrication method of pentalayer polyolefin stretch film
The matter of invention is the fabrication method of stretch pentalayer polyolefin film, in particular the plane film.
The quantity of stretch films production stands for about 50 % of total is about 50 % of total polyethylene film production. Such fil ms are mostly used to protect goods placed on tray against movement or dusting. Stretch films can be produced by extrusion with blowing to give sleeve films or extrusion through sheet die to obtain plane films. The extrusion through sheet die is more effective and, despite of complex and expensive equipment required for entire technological line, this method is competitive in case of large scale productions of stretch films for tray wrapping. In recent years the stretch film technology was dominated by production of multilayer materials composed of couple to tens layers obtained from various copolymers of polyethylene, for example: polyethylene of low density or polyethylene of very low density and others. These substrates provide materials if improved mechanical strength despite diminished thickness.
The technologies of multilayer films were the matter of many patents, like patent application WO 2009/05531 6 entitled "Multilayer films", US6153702 entitled "Polymers, and novel compositions and films therefrom" or US6197887 entitled "Compositions having particular utility as stretch wrap cling film", as well as articles, like "Production of Barrier Films by Chaotic Mixing of Plastics" by Kwon O., Zumbrunnen D.A.. published in Polymer Eng. Sci. 2003, 43 (8), pp. 1443-59. The high contribution of multilayer films in polyethylene film market inspires producers to invest in new technologies enabling to produce films with simultaneous cut of costs and mechanical properties improvement.
Unexpectedly our attempts to obtain multilayer planar stretch film by extrusion through sheet die fed by five screw extruders gave us the film of remarkably improved properties by appropriate selection of olefin copolymers used to form pentalayer film, which is described in patent claim as follows.
According to invention we describe the fabrication method of stretch pentalayer polyolefin film composed of following substrates: low density polyethylene, very low density polyethylene and metalocene linear polyethylene of low density, with the use of screw extruders feeding sheet die characteristic of that:
- the copolymer of ethylene and n-hexene of mass flow rate (MFR) 1.0 to 6.0 g/l Omin; the best 4.0 g/min, was introduced to the first extruder feeding sheet die, used for the formation of first layer of thickness corresponding to 10- 12% of total film thickness,
- the mixture of copolymer of ethylene and n-hexene of MFR 1 .0 to 6.0 g/l Omin; the best 4.0 g/min with copolymer of ethylene and n-hexene obtained in presence of metalocene catalyst, with MFR 1.0 to 6.0 g/l Omin; the best 4.0 g/min, in proportions 20-80% of the former; the best 50%, was introduced to the second extruder feeding sheet die, used for the formation of second layer of thickness corresponding to 28-32% of total fi lm thickness,
- the copolymer analogous to that introduced to first extruder, was introduced into third extruder feeding sheet die, used for the formation of third layer of thickness corresponding to 14- 1 8% of total film thickness,
- the mixture of copolymer of ethylene and n-hexene of MFR 1.0 to 6.0 g/l Omin, consisting 20-80% contribution; the best 60% with polypropylene of MFR 2.0 to 6.0 g/l Omin, consisting 80-20% contribution; the best 40%, was introduced to the fourth extruder feeding sheet die, used for the formation of fourth layer of thickness corresponding to 28-32% of total film thickness,
- the mixture of copolymer of ethylene and n-hexene of MFR 1.0 to 6.0 g/l Omin, consisting 40-95% contribution; the best 80%, with copolymer of ethylene and n- hexene obtained in presence of metalocene catalyst, of MFR 1.0 to 6.0 g/l Omin, consisting 60-5% contribution; the best 20%, was introduced to the fifth extruder feeding sheet die. The temperature of sheet die was 220 - 250 °C, while temperature of separator was 260 °C, the speed of flow roll and rolling was maintained at 590 - 605 m/min.
The obtained pentalayer film of nominal 20 μιη thickness has 23. 1 MPa tensile strength and 600% elongation at breaking point in direction parallel to extrusion direction and 1 1 .2 MPa tensile strength and 460% elongation at breaking point in direction perpendicular to extrusion direction. For comparison the corresponding parameters for the film obtained in traditional way are 20.0 MPa and 340% in parallel direction and 7.2 MPa and 200% in perpendicular direction.
For illustration the fabrication method of pentalayer polyolefin film the examples of protocol are given below.
Example 1
To obtaining pentalayer stretch film according to description of claimed invention the technological line composed of five extruders of following parameters were applied:
• Layer I - screw diameter 75 mm, the length of screw corresponding to 33 diameters of the screw, the extrusion yield 450 kg/h, the range of temperature of heating zones of cylinder - 210 - 260 °C.
• Layer 2 - screw diameter 135 mm, the length of screw corresponding to 33 diameters of the screw, the extrusion yield 1050 kg/h, the range of temperature of heating zones of cylinder - 210 - 260 °C.
• Layer 3 - screw diameter 90 mm, the length of screw corresponding to 33 diameters of the screw, the extrusion yield 600 kg/h, the range of temperature of heating zones of cylinder - 225 - 265 °C.
• Layer 4 - identical parameters as for layer 2.
• Layer 5 - identical parameters as for layer 1
In order to obtain pentalayer film the following components were used:
• Layer 1 - copolymer of ethylene with n-hexene of MFR 4.0 g/1 Omin.
• Layer 2 - mixture of 50 mass % of copolymer of ethylene and n-hexene of MFR 4.0 g/1 Omin and 50% of copolymer of ethylene and n-hexene obtained in presence of metalocene catalyst, of MFR 4.0 g/1 Omin.
• Layer 3 - copolymer of ethylene with n-hexene of MFR 4.0 g/1 Omin. • Layer 4 - mixture of 60 mass % of copolymer of ethylene and n-hexene of MFR 4.0 g/l Omin and 40% of polypropylene of MFR 5.0 g/l Omin.
• Layer 5 - mixture of 80 mass % of copolymer of ethylene and n-hexene of MFR 4.0 g/lOmin and 20% of copolymer of ethylene and n-hexene obtained in presence of metalocene catalyst, of MFR 3.0 g/l Omin.
The stretch film obtained according to this protocol had 20 μιη thickness and better mechanical resistance parameters than standard stretch film obtained without polypropylene, namely 23.1 MPa tensile strength and 600% elongation at breaking point in direction parallel to extrusion direction and 1 1.2 MPa tensile strength and 460% elongation at breaking point in direction perpendicular to extrusion direction.
Example 2
To obtain pentalayer stretch film by extrusion through sheet die the technological line composed of five extruders of parameters analogous to those given in example 1 was applied. The temperature of sheet die was 260 °C. The speed of flow rollers and rolling was 595 m/min and 605 m/min, respectively.
In order to obtain pentalayer film the following components were used:
• Layer 1 - copolymer of ethylene with n-hexene of MFR 4.0 g/l Omin.
• Layer 2 - mixture of 60 mass % of copolymer of ethylene and n-hexene of MFR 4.0 g/l Omin and 40% of copolymer of ethylene and n-hexene obtained in presence of metalocene catalyst, of MFR 4.0 g/l Omin.
• Layer 3 - copolymer of ethylene with n-hexene of MFR 4.0 g/l Omin.
• Layer 4 - mixture of 55 mass % of copolymer of ethylene and n-hexene of MFR 4.0 g/l Omin and 45% of polypropylene of MFR 5.0 g/1 Omin.
• Layer 5 - mixture of 70 mass % of copolymer of ethylene and n-hexene of MFR 4.0 g/1 Omin and 30% of copolymer of ethylene and n-hexene obtained in presence of metalocene catalyst, of MFR 3.0 g/l Omin.
The stretch film obtained according to this protocol had 20 μηι thickness and better mechanical resistance parameters than standard stretch film obtained without polypropylene, namely 24.2 MPa tensile strength and 580% elongation at breaking point in direction parallel to extrusion direction and 1 1.9 MPa tensile strength and 450% elongation at breaking point in direction perpendicular to extrusion direction.

Claims

Patent claim
We claim the fabrication method of pentalayer polyolefin plane stretch film with the use of low density linear polyethylene, very low density linear polyethylene, and metalocene low density linear polyethylene and screw extruders feeding sheet die with separator temperature up to 260 °C characteristic of that:
the copolymer of ethylene and n-hexene of mass flow rate (MFR) 1.0 to 6.0 g/l Omin; the best 4.0 g/min, is introduced to the first extruder feeding sheet die, used for the formation of first layer of thickness corresponding to 10- 12% of total film thickness,
the mixture of copolymer of ethylene and n-hexene of MFR 1 .0 to 6.0 g/l Omin; the best 4.0 g/min with copolymer of ethylene and n-hexene obtained in presence of metalocene catalyst, with MFR 1 .0 to 6.0 g/l Omin; the best 4.0 g/min, in proportions 20-80% of the former; the best 50%, is introduced to the second extruder feeding sheet die, used for the formation of second layer of thickness corresponding to 28-32% of total film thickness,
the copolymer analogous to that introduced to first extruder, is introduced into third extruder feeding sheet die, used for the formation of third layer of thickness corresponding to 14-18% of total film thickness,
the mixture of copolymer of ethylene and n-hexene of MFR 1.0 to 6.0 g/l Omin, consisting 20-80%) contribution; the best 60% with polypropylene of MFR 2.0 to 6.0 g/l Omin, consisting 80-20% contribution; the best 40%, is introduced to the fourth extruder feeding sheet die, used for the formation of fourth layer of thickness corresponding to 28-32% of total film thickness,
the mixture of copolymer of ethylene and n-hexene of MFR 1.0 to 6.0 g/l Omin, consisting 40-95% contribution; the best 80%, with copolymer of ethylene and n- hexene obtained in presence of metalocene catalyst, of MFR 1.0 to 6.0 g/l Omin, consisting 60-5% contribution; the best 20%, is introduced to the fifth extruder feeding sheet die, and all the substrates are provided from extruder to sheet die, while temperature of sheet die and separator are 260 °C.
PCT/PL2012/000079 2012-02-16 2012-09-06 Fabrication method of pentalayer polyolefin stretch film WO2013122484A1 (en)

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DE112012005884.4T DE112012005884B4 (en) 2012-02-16 2012-09-06 Production process for a five-layer polyolefin stretch film

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PLP.398133 2012-02-16
PL398133A PL223808B1 (en) 2012-02-16 2012-02-16 Method for preparing a five-stretch polyolefin film

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Cited By (2)

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WO2015150373A1 (en) * 2014-04-01 2015-10-08 Saudi Basic Industries Corporation Multilayer film
CN108774351A (en) * 2018-05-09 2018-11-09 小黄蜂智能科技（苏州）有限公司 A kind of high-strength nano winding film and its production technology

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EP3403823B1 (en) 2017-05-18 2019-11-06 Ergis S. A. Multilayer film and a method for producing multilayer film
PL240879B1 (en) * 2018-04-20 2022-06-20 Kalinowski Slawomir Zakl Produkcyjno Handlowo Uslugowy Slawpol Multi-layered technical film and its application
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