EP3810420A1 - Films moulés en polyéthylène - Google Patents

Films moulés en polyéthylène

Info

Publication number
EP3810420A1
EP3810420A1 EP19730383.7A EP19730383A EP3810420A1 EP 3810420 A1 EP3810420 A1 EP 3810420A1 EP 19730383 A EP19730383 A EP 19730383A EP 3810420 A1 EP3810420 A1 EP 3810420A1
Authority
EP
European Patent Office
Prior art keywords
layer
lldpe
film
strain
moieties derived
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
EP19730383.7A
Other languages
German (de)
English (en)
Inventor
Lucio Baccaro
Attilio SCALA
Bart VAN DEN ESSCHERT
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.)
SABIC Global Technologies BV
Original Assignee
SABIC Global Technologies BV
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
Application filed by SABIC Global Technologies BV filed Critical SABIC Global Technologies BV
Publication of EP3810420A1 publication Critical patent/EP3810420A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • 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
    • B32B2307/58—Cuttability
    • B32B2307/581—Resistant to cut
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging

Definitions

  • the present invention relates to polyethylene films produced by cast technology.
  • the invention also relates to a process for production of such films.
  • a suitable preparation method for polyethylene films is casting or cast film extrusion.
  • the preparation of a films by casting is well-known in the art.
  • casting is a continuous operation of melting and conveying a polymer in a heated screw-and-barrel assembly, also referred to as a melt extruder.
  • the molten polymer may then be extruded through a slit die onto a roll, which preferably is a chilled, highly polished turning roll, where it may be quenched from one side, which results in the extruded polymeric material to be cooled to form a film, which may be sent to a second roller for further cooling on the other side.
  • an extruded polymer web may be passed through a quench tank for cooling.
  • the film then may pass through a system of rollers, which have different purposes, and may finally be wound onto a roll for storage.
  • Cast films have particular desirable properties, including desirable optical properties such as transparency, haze and gloss, barrier properties and certain desirable mechanical properties, which render them particularly suitable for a variety of purposes, in particular where puncture resistance, barrier resistance and transparency are applicable. Furthermore, the casting process allows for production of films at very high speeds, allowing for economically attractive production of films, and films of a wide variety in thickness can be produced.
  • multi-layer film structures allow for the use of different material formulations in the different layers, as a result of which one can tailor the properties of the multi-layer structure by choosing layers each having their particular properties.
  • moieties derived from ethylene and 1 -octene or 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 , and an MFR 2 of > 0.5 and ⁇ 1 .5 g/10 min;
  • ethylene and 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 and an MFR 2 of > 2.0 and ⁇ 4.0 g/10 min;
  • the density is determined in accordance with ASTM D1505 (2010) and the MFR 2 is the melt mass flow rate determined in accordance with ASTM D1238 (2013) at 190°C under a load of 2.16 kg, and wherein the film is produced by cast extrusion moulding.
  • Such multi-layer film demonstrates a desirable balance of impact resistance, slow penetration puncture resistance, tear resistance and tensile properties, in particular an improved slow penetration puncture resistance.
  • the LLDPE (b) may for example have an MFR 2 of > 2.0 and ⁇ 4.0 g/10 min, for example > 2.5 and ⁇ 3.2 g/10 min.
  • the LLDPE (b) may for example have an MFR 2 of > 2.0 and ⁇ 3.9 or ⁇ 3.8 or ⁇ 3.7 or ⁇ 3.6 or ⁇ 3.5 or ⁇ 3.4 or ⁇ 3.3 or ⁇ 3.2 or ⁇ 3.1 or ⁇ 3.0 g/10 min.
  • the LLDPE(b) may for example have an MFR 2 of > 2.1 or > 2.2 or > 2.3 or > 2.4 or > 2.5 and ⁇ 4.0 g/10 min.
  • the LLDPE(b) may for example have an MFR 2 of > 2.1 or > 2.2 or > 2.3 or > 2.4 or > 2.5 and ⁇ 3.4 g/10 min.
  • the LDPE(a) may for example have an MFR 2 of > 0.5 and ⁇ 1 .4 or ⁇ 1 .3 or ⁇ 1 .2 or ⁇ 1 .1 or ⁇ 1 .0 g/10 min.
  • the LLDPE(a) may for example have an MFR 2 of > 0.6 or > 0.7 or > 0.8 and ⁇ 1.5 g/10 min.
  • the LLDPE(a) may for example have an MFR 2 of > 0.6 or > 0.7 or > 0.8 and ⁇ 1.4 g/10 min.
  • the LLDPE(a) may have an MFR 2 of > 0.6 and ⁇ 1.4 g/10 min, and/or the LLDPE(b) may have an MFR 2 of > 2.5 and ⁇ 3.2 g/10 min.
  • the LLDPE (a) preferably comprise moieties derived from ethylene and 1 -octene.
  • the LLDPE (a) may comprise > 90.0 wt%, preferably > 95.0 wt%, even more preferably > 98.0 wt%, of moieties derived from ethylene, with regard to the total weight of the LLDPE (a), and moieties derived from 1 -octene.
  • the LLDPE (a) may comprise > 90.0 wt% of moieties derived from ethylene and ⁇ 10.0 wt% of moieties derived from 1 -octene, with regard to the total weight of the LLDPE (a), preferably > 95.0 wt% of moieties derived from ethylene and ⁇ 5.0 wt% of moieties derived from 1 -octene.
  • the LLDPE (a) may consist of moieties derived from ethylene and 1 -octene.
  • the LLDPE (a) may consist of > 90.0 wt% of moieties derived from ethylene and ⁇ 10.0 wt% of moieties derived from 1 -octene, with regard to the total weight of the LLDPE (a), preferably > 95.0 wt% of moieties derived from ethylene and ⁇ 5.0 wt% of moieties derived from 1 -octene.
  • the LLDPE (b) preferably comprise moieties derived from ethylene and 1 -hexene.
  • the LLDPE (b) may comprise > 80.0 wt%, preferably > 90.0 wt%, more preferably > 95.0 wt%, even more preferably > 98.0 wt%, of moieties derived from ethylene, with regard to the total weight of the LLDPE (b), and moieties derived from 1 -hexene.
  • the LLDPE (b) may comprise > 90.0 wt% of moieties derived from ethylene and ⁇ 10.0 wt% of moieties derived from 1 -hexene, with regard to the total weight of the LLDPE (b), preferably > 95.0 wt% of moieties derived from ethylene and ⁇ 5.0 wt% of moieties derived from 1 -hexene.
  • the LLDPE (b) may consist of moieties derived from ethylene and 1 -hexene.
  • the LLDPE (b) may consist of > 90.0 wt% of moieties derived from ethylene and ⁇
  • 10.0 wt% of moieties derived from 1 -hexene with regard to the total weight of the LLDPE (b), preferably > 95.0 wt% of moieties derived from ethylene and ⁇ 5.0 wt% of moieties derived from 1 -hexene.
  • the LLDPE (a) is produced using a single-site catalyst.
  • the LLDPE (b) is produced using a single-site catalyst.
  • the LLDPE (a) or the LLDPE (b) may be produced using a single-site catalyst.
  • the LLDPE (a) and the LLDPE (b) may be produced using a single-site catalyst.
  • a single-site catalyst may in the context of the present invention be understood to be a catalyst comprising a compound having one or more indenyl- or cyclopentadienyl-moieties, which may or may not bear substituents, and which are bound to a metal selected from Ti, Zr or Hf to form a complex with catalytic activity in olefin polymerisation.
  • Such single-site catalyst may further comprise an activator compound.
  • the LLDPE (a) may for example have a number-average molecular weight (M n ) of >
  • the LLDPE (a) may have a z-average molecular weight (M z ) of ⁇ 500, preferably ⁇ 400 kg/mol, for example > 200 and ⁇ 500 kg/mol, preferably > 250 and ⁇ 400 kg/mol.
  • the LLDPE (a) may for example have an M w /M n ratio of > 2.0 and ⁇ 4.0.
  • the LLDPE (a) may for example have an M z /M n ratio of ⁇ 25.0, preferably ⁇ 20.0, for example > 5.0 and ⁇ 25.0, preferably > 5.0 and ⁇ 20.0, more preferably > 5.0 and ⁇ 15.0.
  • M n is the number average molecular weight
  • M w is the weight average molecular weight
  • M z is the z-average molecular weight, as determined in accordance with ASTM D6474 (2012).
  • the LLDPE materials used in the multi-layer film according to the present invention may for example be produced in a gas-phase polymerisation process, a slurry polymerisation process, or in a solution polymerisation process.
  • the LLDPE (a) may be produced in a gas-phase polymerisation process, a slurry polymerisation process, or in a solution polymerisation process.
  • the LLDPE (a) may for example be produced in a gas-phase polymerisation process.
  • the LLDPE (a) may be produced in a solution polymerisation process.
  • the LLDPE (b) may be produced in a gas-phase polymerisation process, a slurry polymerisation process, or in a solution polymerisation process.
  • the LLDPE (b) may be produced in a gas-phase polymerisation process.
  • the LLDPE (b) may be produced in a solution polymerisation process.
  • the LLDPE (a) is produced in a gas-phase polymerisation process and the LLDPE (b) is produced in a gas-phase
  • the LLDPE (a) may be produced in a solution
  • Such gas-phase polymerisation process may comprise a single polymerisation reactor in which the LLDPE is produced.
  • such gas-phase polymerisation process may comprise multiple polymerisation reactors positioned in series wherein the reaction product from a preceding reactor is introduced into a subsequently positioned reactor, together with further monomer(s).
  • the further monomer(s) may be ethylene and/or a comonomer.
  • the comonomer is 1 -octene.
  • the comonomer is 1 - hexene.
  • Such solution polymerisation process may comprise a single polymerisation reactor in which the LLDPE is produced.
  • such solution polymerisation process may comprise multiple polymerisation reactors positioned in series wherein the reaction product from a preceding reactor is introduced into a subsequently positioned reactor, together with further monomer(s).
  • the further monomer(s) may be ethylene and/or a comonomer.
  • the comonomer is 1 -octene.
  • the comonomer is 1 - hexene.
  • Each of the LLDPE materials used in the multi-layer film according to the present invention may for example comprise > 80.0 wt%, preferably > 90.0 wt%, more preferably > 95.0 wt%, even more preferably > 98.0 wt%, of moieties derived from ethylene, with regard to the total weight of the LLDPE.
  • LLDPE (a) may comprise > 80.0 wt%, preferably > 90.0 wt%, more preferably > 95.0 wt%, even more preferably > 98.0 wt%, of moieties derived from ethylene, with regard to the total weight of the LLDPE (a).
  • LLDPE (b) may comprise > 80.0 wt%, preferably > 90.0 wt%, more preferably > 95.0 wt%, even more preferably > 98.0 wt%, of moieties derived from ethylene, with regard to the total weight of the LLDPE (b).
  • the multi-layer film according to the invention involves a certain
  • the LLDPE (a) comprises > 80.0 wt% of moieties derived from ethylene and/or > 2.0 and ⁇ 20.0 wt% of moieties derived from 1 -octene or 1 -hexene, with regard to the total weight of the LLDPE (a); and/or
  • the multi-layer film of the invention may in certain embodiments comprise two outer layers and at least one inner layer.
  • the multi-layer film may comprise two outer layers and at least one inner layer, wherein at least one inner layer is a layer (a) comprising the LLDPE (a).
  • the multi-layer film of the present invention may in certain embodiments comprise two outer layers, wherein at least one outer layer is a layer (b) comprising the LLDPE (b).
  • both outer layers are each a layer (b) comprising LLDPE (b).
  • At least one outer layer is arranged to contact an inner layer (a) comprising LLDPE (a).
  • Each layer (a) comprising LLDPE (a) may for example comprise an individually selected quantity of the LLDPE (a) with regard to the total weight of that layer (a), preferably an individually selected quantity of at least 80.0 wt% of the LLDPE (a), more preferably at least 90.0 wt%, even more preferably that layer may consist of the LLDPE (a) and optionally up to 2.0 wt% of additives, with regard to the total weight of that layer.
  • Each layer (b) comprising LLDPE (b) may for example comprise an individually selected quantity of the LLDPE (b) with regard to the total weight of that layer (b), preferably an individually selected quantity of at least 80.0 wt% of the LLDPE (b), more preferably at least 90.0 wt%, even more preferably that layer may consist of the LLDPE (b) and optionally up to 2.0 wt% of additives, with regard to the total weight of that layer.
  • each layer (a) comprising LLDPE (a) may for example comprise an individually selected quantity of the LLDPE (a) with regard to the total weight of that layer (a), preferably an individually selected quantity of at least 80.0 wt% of the LLDPE (a), more preferably at least 90.0 wt%, even more preferably that layer may consist of the LLDPE (a) and optionally up to 2.0 wt% of additives, with regard to the total weight of that layer, and each layer (b) comprising LLDPE (b) may for example comprise an individually selected quantity of the LLDPE (b) with regard to the total weight of that layer (b), preferably an individually selected quantity of at least 80.0 wt% of the LLDPE (b), more preferably at least 90.0 wt%, even more preferably that layer may consist of the LLDPE (b) and optionally up to 2.0 wt% of additives, with regard to the total weight of that layer.
  • the LLDPE (b) demonstrates a stress-strain relationship such that in the whole region of strain of 100-300% the derivative of the stress-strain curve do/de is > 5.0 kPa/%, stress and strain being determined in accordance with ISO 527-3 (1995).
  • the LLDE (b) may demonstrate a stress-strain relationship such that in the whole region of strain of 100-300% the derivative of the stress-strain curve do/de is > 5.0 kPa/%, preferably > 7.5 kPa/%, more preferably > 10.0 kPa/%, even more preferably > 15.0 kPa/%, even further preferably > 20.0 kPa.
  • LLDPE (b) may demonstrate a stress-strain relationship such that in the whole region of strain of 100-300% the derivative of the stress- strain curve do/de is > 5.0 kPa/% and ⁇ 500 kPa/%, preferably > 5.0 kPa/% and ⁇ 200kPa/%, more preferably > 7.5 kPa/% and ⁇ 200 kPa/%, even more preferably > 10.0 kPa/% and ⁇ 200 kPa/%, even further preferably > 15.0 kPa/% and ⁇ 20.0 kPa/%.
  • the multi-layer film according to the invention may for example comprise or consist of 3, 5, 7, 9, or 1 1 layers.
  • the multi-layer film of the invention may comprise or consist of 3, 5 or 7 layers.
  • the multi-layer film according to the invention may for example consist of 3,
  • the multi-layer film of the invention may consist of 3, 5 or 7 layers.
  • the multi-layer film according to the invention may for example be a 3-layer film wherein each outer layer is a layer (b) comprising LLDPE (b) and the inner layer is a layer (a) comprising LLDPE (a).
  • the multi-layer film may be a 5-layer film wherein each outer is a layer (b) comprising LLDPE (b), further comprising two intermediate layers each arranged to contact one of the outer layers, and a core layer, wherein at least one of the intermediate layers or the core layer comprises or consists of LLDPE (a).
  • the multi-layer film may be a 5- layer film wherein each outer is a layer (b) comprising LLDPE (b), further comprising two intermediate layers each arranged to contact one of the outer layers, and a core layer, wherein each of the intermediate layers and the core layer may individually be selected to comprise LLDPE (a) or LLDPE (b), wherein at least one of the intermediate layers or the core layer comprises or consists of LLDPE (a).
  • the multi-layer film may be a 5-layer film wherein each outer is a layer (b) comprising LLDPE (b), further comprising two intermediate layers each arranged to contact one of the outer layers, and a core layer, wherein each of the intermediate layers and the core layer may individually be selected to comprise LLDPE (a) or LLDPE (b), wherein at least one of the intermediate layers or the core layer comprises or consists of LLDPE (a), wherein the LLDPE(a) has an MFR 2 of > 0.6 and ⁇ 1 .4 g/10 min, and/or wherein the LLDPE(b) has an MFR 2 of > 2.5 and ⁇ 3.2 g/10 min.
  • the multi-layer film according to the invention may for example have a thickness of 5.0- 100.0 pm, preferably 5.0-75.0 pm, more preferably 5.0-50.0 pm, even more preferably 15.0-50.0 pm, even more preferably 20.0-40.0 pm, or 50.0-100.0 pm, preferably 70.0-100.0 pm, or 50.0- 75.0 pm.
  • the invention also relates to a process for manufacturing a multi-layer film according to the invention, wherein the process involves at least two melt extruders comprising slit dies for extrusion of film, and optionally further melt extruder(s) each comprising slit dies, and a setup for capturing the molten film layers obtained from the melt extruders, combining the molten film layers to form a multi-layer film and cooling the obtained film, the process comprising the steps of:
  • the first film layer is combined with the second film layer and at least one further film layer such that the first film layer forms an inner layer and the second film layer forms an outer layer of the multi-layer film.
  • At least one of the further film layer(s) is produced of a material equal to the second film layer, preferably wherein that further film layer forms an outer layer of the multi-layer film.
  • the process according to the invention is a continuously operated process.
  • the invention relates to a multi-layer film comprising:
  • moieties derived from ethylene and 1 -octene or 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 , an MFR 2 of > 0.5 and ⁇ 1.5 g/10 min, and an M w /M n ratio of > 2.0 and ⁇ 4.0; and
  • ethylene and 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 and an MFR 2 of
  • the density is determined in accordance with ASTM D1505 (2010) and the MFR 2 is the melt mass flow rate determined in accordance with ASTM D1238 (2013) at 190°C under a load of 2.16 kg, and wherein the film is produced by cast extrusion moulding; wherein M n is the number average molecular weight and M w is the weight average molecular weight, as determined in accordance with ASTM D6474 (2012).
  • the invention relates to a multi-layer film comprising:
  • moieties derived from ethylene and 1 -octene or 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 , an MFR 2 of > 0.5 and ⁇ 1.5 g/10 min, an M w /M n ratio of > 2.0 and ⁇ 4.0, and an M z /M w ratio of > 5.0 and ⁇ 25.0; and
  • ethylene and 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 and an MFR 2 of
  • the density is determined in accordance with ASTM D1505 (2010) and the MFR 2 is the melt mass flow rate determined in accordance with ASTM D1238 (2013) at 190°C under a load of 2.16 kg, and wherein the film is produced by cast extrusion moulding; wherein M n is the number average molecular weight, M w is the weight average molecular weight, and M z is the z-average molecular weight, as determined in accordance with ASTM D6474 (2012).
  • the invention also relates to to a multi-layer film comprising:
  • moieties derived from ethylene and 1 -octene or 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 , an MFR 2 of > 0.5 and ⁇ 1.5 g/10 min, an M w /M n ratio of > 2.0 and ⁇ 4.0, and an M z /M w ratio of > 5.0 and ⁇ 25.0; and
  • ethylene and 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 and an MFR 2 of
  • the density is determined in accordance with ASTM D1505 (2010) and the MFR 2 is the melt mass flow rate determined in accordance with ASTM D1238 (2013) at 190°C under a load of 2.16 kg, and wherein the film is produced by cast extrusion moulding; wherein M n is the number average molecular weight, M w is the weight average molecular weight, and M z is the z-average molecular weight, as determined in accordance with ASTM D6474 (2012); wherein the film comprises two outer layers and at least one inner layer, wherein at least one of the inner layer(s) is a layer (a) comprising the LLDPE (a).
  • the invention also relates to a multi-layer film comprising:
  • moieties derived from ethylene and 1 -octene or 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 , an MFR 2 of > 0.5 and ⁇ 1.5 g/10 min, an M w /M n ratio of > 2.0 and ⁇ 4.0, and an M z /M w ratio of > 5.0 and ⁇ 25.0; and
  • ethylene and 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 and an MFR 2 of
  • the density is determined in accordance with ASTM D1505 (2010) and the MFR 2 is the melt mass flow rate determined in accordance with ASTM D1238 (2013) at 190°C under a load of 2.16 kg, and wherein the film is produced by cast extrusion moulding; wherein M n is the number average molecular weight, M w is the weight average molecular weight, and M z is the z-average molecular weight, as determined in accordance with ASTM D6474 (2012); wherein the film comprises two outer layers and at least one inner layer, wherein at least one of the inner layer(s) is a layer (a) comprising the LLDPE (a), wherein the film consist of 5 layers.
  • the invention also relates to a multi-layer film comprising:
  • moieties derived from ethylene and 1 -octene or 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 , an MFR 2 of > 0.5 and ⁇ 1.5 g/10 min, an M w /M n ratio of > 2.0 and ⁇ 4.0, and an M z /M w ratio of > 5.0 and ⁇ 25.0; and
  • ethylene and 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 and an MFR 2 of
  • the density is determined in accordance with ASTM D1505 (2010) and the MFR 2 is the melt mass flow rate determined in accordance with ASTM D1238 (2013) at 190°C under a load of 2.16 kg, and wherein the film is produced by cast extrusion moulding; wherein M n is the number average molecular weight, M w is the weight average molecular weight, and M z is the z-average molecular weight, as determined in accordance with ASTM D6474 (2012); wherein the film comprises two outer layers and at least one inner layer, wherein at least one of the inner layer(s) is a layer (a) comprising the LLDPE (a), wherein the film consist of 5 layers; wherein the two outer layers each comprise the LLDPE (b) and wherein each of the layers comprises LLDPE (a) or LLDPE (b).
  • the invention also relates to a multi-layer film comprising:
  • moieties derived from ethylene and 1 -octene or 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 , and an MFR 2 of > 0.5 and ⁇ 1.5 g/10 min;
  • ethylene and 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 and an MFR 2 of
  • the density is determined in accordance with ASTM D1505 (2010) and the MFR 2 is the melt mass flow rate determined in accordance with ASTM D1238 (2013) at 190°C under a load of 2.16 kg, and wherein the film is produced by cast extrusion moulding;
  • the invention also relates to a multi-layer film comprising: (a) at least one layer comprising a linear low-density polyethylene (LLDPE) (a) comprising moieties derived from ethylene and 1 -octene or 1 -hexene, having a density of > 900 and ⁇ 925 kg/m 3 , and an MFR 2 of > 0.5 and ⁇ 1.5 g/10 min; and
  • LLDPE linear low-density polyethylene
  • ethylene and 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 and an MFR 2 of
  • the density is determined in accordance with ASTM D1505 (2010) and the MFR 2 is the melt mass flow rate determined in accordance with ASTM D1238 (2013) at 190°C under a load of 2.16 kg, and wherein the film is produced by cast extrusion moulding;
  • the invention also relates to a multi-layer film comprising:
  • moieties derived from ethylene and 1 -octene or 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 , and an MFR 2 of > 0.5 and ⁇ 1.5 g/10 min;
  • ethylene and 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 and an MFR 2 of
  • the density is determined in accordance with ASTM D1505 (2010) and the MFR 2 is the melt mass flow rate determined in accordance with ASTM D1238 (2013) at 190°C under a load of 2.16 kg, and wherein the film is produced by cast extrusion moulding;
  • the invention also relates to a multi-layer film comprising:
  • moieties derived from ethylene and 1 -octene or 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 , and an MFR 2 of > 0.5 and ⁇ 1.5 g/10 min;
  • ethylene and 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 and an MFR 2 of
  • the invention also relates to a multi-layer film comprising:
  • moieties derived from ethylene and 1 -octene or 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 , and an MFR 2 of > 0.5 and ⁇ 1.5 g/10 min;
  • ethylene and 1 -hexene having a density of > 900 and ⁇ 925 kg/m 3 and an MFR 2 of > 2.0 and ⁇ 4.0 g/10 min;
  • the density is determined in accordance with ASTM D1505 (2010) and the MFR 2 is the melt mass flow rate determined in accordance with ASTM D1238 (2013) at 190°C under a load of 2.16 kg, and wherein the film is produced by cast extrusion moulding;
  • the invention in a certain embodiment also relates to a food package comprising the multi-layer film of the invention.
  • PE-A LLDPE
  • SUPEERTM 81 12 an ethylene/1 -octene copolymer produced via
  • solution polymerisation using a single-site catalyst obtainable from SABIC, having a density of 912 kg/m 3 , an MFR 2 of 1 .1 g/10 min.
  • PE-B LLDPE (b): SUPEERTM 7318, also referred to as VM002, an ethylene/1 -hexene copolymer produced via gas-phase polymerisation using a single-site catalyst, obtainable from SABIC, having a density of 918 kg/m 3 , and an MFR 2 of 3.0 g/10 min.
  • PE-C Exceed 3518CB, an ethylene/1 -hexene copolymer produced using a single-site catalyst, obtainable from ExxonMobil, having a density of 918 kg/m 3 and an MFR 2 of 3.5 g/10 min.
  • the PE-B demonstrated a stress-strain relationship as presented in the below table, tested in accordance with ISO 527-3 (1995).
  • the strain (e) presents the elongation in % of the sample
  • the stress (s) presents the force to be applied to maintain the sample at that elongation in MPa
  • do/de presents the derivative of the stress-strain curve at a given strain, in kPa/%, indicating the increase of force to be applied to maintain elongation at an increased elongation.
  • Example 3 represents the film of the present invention.
  • Examples 1 , 2 and 4 are included for comparative purposes.
  • Films were produced via cast moulding according to the following procedure.
  • a film line was used having four melt extruders.
  • the extruders were operated according to the below temperature conditions for each zone:
  • the material extruded from extruder A was processed to form film layer 1 , from extruder B to form layer 2, and from extruder D to form layer 5.
  • the material that was extruded via extruder C was split into two 50/50 wt% streams each to form a separate layer (layers 3 and 4). Layers 1 through 5 were positioned on top of each other consecutively.
  • the material as extruded was forced through a slit die to form a layered film.
  • the extruded film was passed via a chill roll system comprising a chill roll having a temperature of 45°C, and three further rolls.
  • Example 1 The extruders were operated according to the below conditions: Example 1 :
  • the output is to be understood to be the quantity of material exiting each extruder; the speed is the screw speed, in revolutions per minute; the die pressure is the pressure of the material in the last zone of the extruder before the material is extruded; and the melt temp is the temperature of the material in the last zone of the extruder before the material reaches the die.
  • the chill roll system was arranged so that layer 5 (one of the outer surface layers) of the extruded film contacted the surface of the chill roll, subsequently layer 1 (the other outer surface layer) contacted the surface of roll 2, again layer 5 contacted roll 3, again layer 1 contacted roll 4, and layer 5 was positioned as the surface layer contacting the winder roll.
  • the speed of the rolls was set such that each roll was operated at a slightly higher speed than the preceding roll, to ensure a small force was exerted onto the film avoiding processing imbalances.
  • the thus obtained films were subjected to a variety of analytical tests to determine the properties of the films. Results of those tests are presented in the table here below.
  • the dart impact resistance property impact failure weight was determined in accordance with ASTM D1709 (2016), method A.
  • the tear resistance properties tearing force were determined in accordance with ASTM D1922 (2015), where MD indicates the machine direction, i.e. the direction in which the film is passed through the cast moulding process, and TD indicates the transverse direction, i.e. the direction perpendicular to the machine direction in the plane of the film.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne un film multicouche comprenant: (a) au moins une couche comprenant un polyéthylène linéaire basse densité (LLDPE) (a) comprenant des fractions dérivées de l'éthylène et du 1-octène ou du 1-hexène, ayant une densité ≥ 900 et ≤ 925 kg/m3, et un MFR2 ≥ 0,5 et ≤ 1,5 g/10 min; et (b) au moins une couche comprenant un LLDPE (b) comprenant des fractions dérivées de l'éthylène et du 1-hexène, ayant une densité ≥ 900 et ≤ 925 kg/m3 et un MFR2 de ≥ 2,0 et ≤ 4,0 g/10 min; la densité étant déterminée conformément à ASTM D1505 (2010) et le MFR2 est le débit massique de masse fondue déterminé conformément à la norme ASTM D1238 (2013) à 190 °C sous une charge de 2,16 kg, et le film étant produit par moulage par extrusion moulée. Un tel film multicouche présente un équilibre souhaitable entre la résistance aux chocs, la résistance à la perforation à pénétration lente, la résistance à la déchirure et les propriétés de traction.
EP19730383.7A 2018-06-21 2019-06-18 Films moulés en polyéthylène Pending EP3810420A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18178961 2018-06-21
PCT/EP2019/066057 WO2019243348A1 (fr) 2018-06-21 2019-06-18 Films moulés en polyéthylène

Publications (1)

Publication Number Publication Date
EP3810420A1 true EP3810420A1 (fr) 2021-04-28

Family

ID=62816310

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19730383.7A Pending EP3810420A1 (fr) 2018-06-21 2019-06-18 Films moulés en polyéthylène

Country Status (2)

Country Link
EP (1) EP3810420A1 (fr)
WO (1) WO2019243348A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024000090A1 (fr) * 2022-06-27 2024-01-04 Univation Technologies, Llc Mélanges post-réacteur de polyéthylènes linéaires de faible densité
EP4306291A1 (fr) * 2022-06-30 2024-01-17 Industria Termoplastica Pavese S.p.A. Film polymère pour couvrir des voitures

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001054929A (ja) * 1999-06-11 2001-02-27 Mitsui Chemicals Inc 包装用フィルムおよびその用途
JP2005059243A (ja) * 2003-08-20 2005-03-10 Sumitomo Chemical Co Ltd 樹脂積層フィルム
US20170036425A1 (en) * 2014-06-17 2017-02-09 Exxonmobil Chemical Patents Inc. Gloves Comprising Propylene-Based Elastomer and Methods of Making Same
US9963529B1 (en) * 2017-04-19 2018-05-08 Nova Chemicals (International) S.A. Multi reactor solution polymerization

Also Published As

Publication number Publication date
WO2019243348A1 (fr) 2019-12-26

Similar Documents

Publication Publication Date Title
EP3261838B1 (fr) Structure de film stratifié uniquement à base de polyéthylène
EP3390049B1 (fr) Structure de film stratifié à base de polyéthylène avec des propriétés de protection
KR102219390B1 (ko) 다층 구조
EP2875948B1 (fr) Film orienté dans le sens machine
EP2698251B1 (fr) Films
KR101442268B1 (ko) 고밀도 폴리에틸렌
EP2415598B1 (fr) Film multicouche
CA2580686C (fr) Melange de polymere olefinique thermoplastique et films adhesifs constitues dudit melange
EP3101060B1 (fr) Film orienté dans le sens d'une machine avec des propriétés équilibrées à faible taux d'étirement
WO2015052246A1 (fr) Film orienté dans le sens machine pour étiquettes
TW201119861A (en) Multilayer polypropylene films and methods of making and using same
EP2173794B1 (fr) Films de polyéthylène
EP3810420A1 (fr) Films moulés en polyéthylène
EP3386750B1 (fr) Film multicouche
WO2020245425A1 (fr) Films multicouches orientés dans le sens machine pour étanchéité
WO2018096015A1 (fr) Film multicouche
EP2883683A1 (fr) Film d'emballage pré-étiré
PL223808B1 (pl) Poliolefinowa, pięciowarstwowa folia typu stretch
WO2021076552A1 (fr) Films de polyéthylène multicouches orientés dans le sens machine et articles les comprenant
US20220298317A1 (en) Package comprising a bi-directionally oriented polyethylene film
US9238315B2 (en) Rigid film having high puncture resistance and tear propagation resistance
CA2479190A1 (fr) Melanges de polyethylenes
EP3411428B1 (fr) Films de polyéthylène et procédés pour leur fabrication

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20210104

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20231006