WO2015004980A1 - Coextruded multilayer film - Google Patents

Coextruded multilayer film Download PDF

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Publication number
WO2015004980A1
WO2015004980A1 PCT/JP2014/062461 JP2014062461W WO2015004980A1 WO 2015004980 A1 WO2015004980 A1 WO 2015004980A1 JP 2014062461 W JP2014062461 W JP 2014062461W WO 2015004980 A1 WO2015004980 A1 WO 2015004980A1
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WO
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Prior art keywords
film
cyclic olefin
intermediate layer
mass
resin
Prior art date
Application number
PCT/JP2014/062461
Other languages
French (fr)
Japanese (ja)
Inventor
章晃 小野寺
Original Assignee
ポリプラスチックス株式会社
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Publication of WO2015004980A1 publication Critical patent/WO2015004980A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion 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
    • B29C48/07Flat, e.g. panels
    • B29C48/08Flat, e.g. panels flexible, e.g. films
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion 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
    • B29C48/09Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered 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
    • B32B27/08Layered 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/325Layered products comprising a layer of synthetic resin comprising polyolefins comprising polycycloolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2023/00Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04Polymers of ethylene
    • B29K2023/06PE, i.e. polyethylene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2023/00Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04Polymers of ethylene
    • B29K2023/06PE, i.e. polyethylene
    • B29K2023/0608PE, i.e. polyethylene characterised by its density
    • B29K2023/0625LLDPE, i.e. linear low density polyethylene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2023/00Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04Polymers of ethylene
    • B29K2023/06PE, i.e. polyethylene
    • B29K2023/0608PE, i.e. polyethylene characterised by its density
    • B29K2023/0633LDPE, i.e. low density polyethylene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2023/00Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/38Polymers of cycloalkenes, e.g. norbornene or cyclopentene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2995/00Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037Other properties
    • B29K2995/0065Permeability to gases
    • B29K2995/0067Permeability to gases non-permeable
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2995/00Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037Other properties
    • B29K2995/0081Tear strength
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00Flat articles, e.g. films or sheets
    • B29L2007/008Wide strips, e.g. films, webs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00Layered products
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/40Properties of the layers or laminate having particular optical properties
    • B32B2307/402Coloured
    • B32B2307/4026Coloured within the layer by addition of a colorant, e.g. pigments, dyes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582Tearability
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/70Other properties
    • B32B2307/724Permeability to gases, adsorption
    • B32B2307/7242Non-permeable
    • B32B2307/7246Water vapor barrier
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00Containers; Receptacles
    • B32B2439/70Food packaging
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state

Definitions

  • the present invention relates to a multilayer coextruded film.
  • the film used as a packaging material or the like has been required to have a property that is easily tearable by hand (hereinafter referred to as “easy tearability”).
  • An example of such a film is a film using a cyclic olefin resin, which is a resin having easy tearability, as a material.
  • a multilayer film Patent Document 1 in which an outer layer and an inner layer containing polyethylene having a specific density and an intermediate layer containing a cyclic olefin-based resin and polyethylene having a specific density are laminated has been proposed.
  • water vapor barrier property a property of blocking water
  • the present invention has been made to solve the above-described problems, and an object thereof is to provide a multilayer coextruded film having easy tearability and water vapor barrier properties.
  • the inventor has three or more multilayers composed of an intermediate layer containing a cyclic olefin-based resin and a polyethylene-based resin, and an outer layer disposed on both outer sides of the intermediate layer and containing a polyethylene-based resin.
  • the co-extruded film it is found that the above-mentioned problem can be solved by setting the ratio of the content of the cyclic olefin resin in the multilayer co-extruded film and the content of the cyclic olefin resin in the intermediate layer to a predetermined range,
  • the present invention has been completed. Specifically, the present invention provides the following.
  • a multilayer coextruded film of 3 or more layers comprising: When the content of the cyclic olefin resin in the multilayer coextruded film is (A) mass% and the content of the cyclic olefin resin in the intermediate layer is (B) mass%, A multilayer coextruded film, wherein (B) / (A), which is the ratio of (B) to (A), is 4 or more and 8 or less.
  • a multilayer coextruded film having easy tearability and water vapor barrier properties is provided.
  • a multilayer coextruded film of the present invention (hereinafter also referred to as “film of the present invention”) is disposed on both outer sides of an intermediate layer containing a cyclic olefin-based resin and a polyethylene-based resin.
  • the film of the present invention is prepared such that the mass ratio of the content of the cyclic olefin resin in the entire film and the content of the cyclic olefin resin in the intermediate layer is within a predetermined range.
  • the content of the cyclic olefin resin in the film of the present invention is (A) mass%
  • the content of the cyclic olefin resin in the intermediate layer is (B) mass%.
  • the ratio of (B) to (A) that is, (B) / (A), which is a value obtained by dividing (B) by (A) is adjusted to 4 or more and 8 or less.
  • (B) / (A) is 4 or more and 8 or less indicates that the thickness of the intermediate layer in the film of the present invention is relatively thin compared to the total thickness of the other layers (outer layers).
  • middle layer means that it is relatively high compared with the density
  • the present inventor has excellent easy tearability, and further excellent, even when the total amount of the cyclic olefin-based resin contained in the film is smaller than the conventional amount. It has been found for the first time that a water vapor barrier property can be realized.
  • (B) / (A) is 4 or more, preferably 4.5 or more, and more preferably 5 or more, sufficient easy tearability and water vapor barrier property can be imparted to the multilayer coextruded film.
  • the content of the cyclic olefin-based resin in the multilayer coextruded film is not excessive. In addition to not easily damaging the properties of other resins contained in the resin, it is possible to reduce costs.
  • “(A) mass%” is not particularly limited as long as the above-mentioned “(B) / (A)” is satisfied, but it is 5% by mass or more and less than 20%, preferably 10% by mass or more and less than 20%, more preferably 5%. It may be from 18% to 18% by mass. According to the present invention, even if the content of the cyclic olefin resin in the film is a small amount of 5% by mass or more and less than 20%, sufficient easy tearability and water vapor barrier property can be imparted to the film. The higher “(A) mass%” (for example, 13 to 17 mass%), the easier it is to obtain a multilayer coextruded film that is particularly excellent in water vapor barrier properties.
  • “(B) mass%” is not particularly limited as long as the above-mentioned “(B) / (A)” is satisfied, but it is 30% by mass or more and less than 95% by mass, preferably 50% by mass or more and less than 95% by mass, and more preferably. 60 mass% or more and less than 95 mass% may be sufficient.
  • the content of the cyclic olefin-based resin in the intermediate layer is within such a range, and the polyethylene-based resin is included in the intermediate layer, sufficient easy tearability and water vapor barrier properties can be imparted to the film.
  • the intermediate layer contains only the cyclic olefin-based resin (that is, when “(B) mass%” is 100 mass%), the obtained film cannot be easily torn, and good easy Does not tear.
  • the two outer layers arranged on both outer sides of the intermediate layer including the intermediate layer contain a polyethylene resin.
  • the outer layer may be made of a polyethylene-based resin, and may contain a cyclic olefin-based resin as long as the above “(B) / (A)” is satisfied.
  • the two outer layers preferably have the same composition and / or the same thickness in that the curl of the film can be prevented.
  • the cyclic olefin resin in the present invention is not particularly limited as long as it is a polymer or copolymer containing a structural unit derived from a cyclic olefin in the main chain.
  • a polymer or copolymer containing a structural unit derived from a cyclic olefin in the main chain For example, an addition polymer of a cyclic olefin or a hydrogenated product thereof, an addition copolymer of a cyclic olefin and an ⁇ -olefin, or a hydrogenated product thereof can be used.
  • a cyclic olefin resin can be used individually by 1 type, or can also use 2 or more types together.
  • examples of the cyclic olefin-based resin include those obtained by grafting and / or copolymerizing an unsaturated compound having a polar group in the polymer or the copolymer containing a structural unit derived from a cyclic olefin in the main chain. It is done.
  • Examples of the polar group include a carboxyl group, an acid anhydride group, an epoxy group, an amide group, an ester group, and a hydroxyl group.
  • Examples of the unsaturated compound having a polar group include (meth) acrylic acid and maleic acid. Acid, maleic anhydride, itaconic anhydride, glycidyl (meth) acrylate, alkyl (meth) acrylate (carbon number 1-10) ester, alkyl maleate (carbon number 1-10) ester, (meth) acrylamide, (meta And 2-hydroxyethyl acrylate.
  • cyclic olefin resin a commercially available resin
  • examples of commercially available cyclic olefin-based resins include TOPAS (registered trademark) (Topas Advanced Polymers), Apel (registered trademark) (Mitsui Chemicals), Zeonex (registered trademark) (manufactured by Nippon Zeon), Examples include ZEONOR (registered trademark) (manufactured by ZEON Corporation), ARTON (registered trademark) (manufactured by JSR Corporation), and the like.
  • Particularly preferred examples of the addition copolymer of cyclic olefin and ⁇ -olefin include [1] a structural unit derived from an ⁇ -olefin having 2 to 20 carbon atoms, and [2] represented by the following general formula (I). And a copolymer containing a structural unit derived from a cyclic olefin.
  • R 1 to R 12 may be the same or different and are each selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group; R 9 and R 10 , R 11 and R 12 may be integrated to form a divalent hydrocarbon group, R 9 or R 10 and R 11 or R 12 may form a ring with each other.
  • N represents 0 or a positive integer; When n is 2 or more, R 5 to R 8 may be the same or different in each repeating unit.
  • ⁇ -olefin having 2 to 20 carbon atoms The ⁇ -olefin having 2 to 20 carbon atoms is not particularly limited. For example, the same ones as in JP2007-302722 can be mentioned. These ⁇ -olefins may be used singly or in combination of two or more. Of these, ethylene is most preferably used alone.
  • R 1 to R 12 in the general formula (I) may be the same or different and are selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group.
  • Specific examples of the cyclic olefin represented by the general formula (I) include those similar to those described in JP-A-2007-302722.
  • cyclic olefins may be used singly or in combination of two or more.
  • the polymerization method of the ⁇ -olefin having 2 to 20 carbon atoms and the cyclic olefin represented by [2] general formula (I) and the hydrogenation method of the obtained polymer are not particularly limited. Can be carried out according to a known method.
  • the polymerization catalyst used is not particularly limited, and a cyclic olefin resin can be obtained by a known method using a conventionally known catalyst such as a Ziegler-Natta, metathesis, or metallocene catalyst.
  • the glass transition point of the cyclic olefin resin is preferably 30 ° C. or higher and 140 ° C. or lower. If the glass transition point of cyclic olefin resin is 30 degreeC or more, it is preferable at the point which can prevent the blocking of the pellets at the time of shaping
  • the glass transition point of the cyclic olefin resin can be adjusted by adjusting the content of the cyclic olefin skeleton of the main chain. As the glass transition point, a value measured by a DSC method (method described in JIS K7121) under a temperature rising rate of 10 ° C./min is employed.
  • Polyethylene resin As a polyethylene-type resin in this invention, what is normally used for a film can be used. Examples thereof include linear low density polyethylene (LLDPE), high pressure method low density polyethylene (LDPE) and high density polyethylene (HDPE), ethylene vinyl acetate copolymer (EVA), ethylene ionomer, and polyethylene elastomer.
  • LLDPE linear low density polyethylene
  • LDPE high pressure method low density polyethylene
  • HDPE high density polyethylene
  • EVA ethylene vinyl acetate copolymer
  • ethylene ionomer ethylene ionomer
  • polyethylene elastomer polyethylene elastomer
  • the above resins may be used alone or in combination of two or more. When the above resins are used in combination, the ratio can be appropriately adjusted according to the processability of the film to be obtained.
  • LLDPE is preferable in terms of excellent molding stability such as ease of processing.
  • a mixture of LLDPE and LDPE is particularly preferable in that the transparency of the resulting film can be improved in addition to the film forming stability.
  • the polyethylene resin used in the intermediate layer and the outer layer may have the same composition or different compositions.
  • the composition of the polyethylene resin may be different between the intermediate layer and the outer layer, and the polyethylene resins in the two outer layers may be different from each other.
  • the polyethylene resins used in the two outer layers sandwiching the intermediate layer preferably have the same composition.
  • the polyethylene resin in the intermediate layer and the outer layer preferably have the same composition in that a film having excellent easy tearability and molding stability is obtained, and is a mixture of LLDPE and LDPE having the same composition. Is more preferable.
  • components usually used as components of the film may be appropriately blended within a range not impairing the object of the present invention.
  • Such components include resins other than cyclic olefin resins and polyethylene resins (polyester resins, etc.), slip agents, antioxidants, secondary antioxidants, colorants, neutralizers, dispersants, light stability Agents, ultraviolet absorbers, lubricants, antistatic agents, antifogging agents, nucleating agents, pigments, colorants, flame retardants, antiblocking agents, and other various organic and inorganic compounds.
  • the blending amount of these components is appropriately adjusted according to the effect to be obtained.
  • the method for producing the film of the present invention is not particularly limited.
  • the film can be produced by a conventionally known extrusion method (T-die multilayer coextrusion method or the like) or an inflation method.
  • the blow ratio is preferably 1.5 to 4.0.
  • the stretching effect in the transverse direction (TD direction) perpendicular to the film flow direction is particularly enhanced, which is preferable in that a film having easy tearability can be easily formed.
  • composition ratio of the thickness of the intermediate layer in the film of the present invention and the two outer layers disposed on both outer sides of the intermediate layer are also referred to as “inner layer and outer layer”.
  • the thickness of the intermediate layer can be reduced as compared with the total thickness of the inner layer and the outer layer. It is preferable that the thickness of the intermediate layer is thinner than the thickness of the inner layer and the thickness of the outer layer in that the effects of the present invention can be easily obtained.
  • the thickness of the inner layer and the thickness of the outer layer are preferably the same in that the curling of the film can be prevented.
  • the film of the present invention may have additional layers such as a second intermediate layer and a third intermediate layer in addition to the intermediate layer, the inner layer and the outer layer. That is, the intermediate layer may be composed of a plurality of layers.
  • the present invention is prepared by preparing a film so that the total amount of the cyclic olefin-based resin in the intermediate layer composed of a plurality of layers other than the inner layer and the outer layer satisfies the above-mentioned “(B) / (A)”. Film is obtained.
  • the total layer thickness (that is, the total thickness of the outer layer, the intermediate layer, and the inner layer) of the film of the present invention is not particularly limited.
  • the total thickness of the film of the present invention can be adjusted to, for example, 20 ⁇ m or more and 200 ⁇ m or less.
  • the film of the present invention is excellent in easy tearability.
  • the easy tearability of the film of the present invention is specified by an Elmendorf tear test according to JIS K7128 and JIS P8116. The lower the obtained value, the lower the tear strength and the better the easy tearability.
  • the film of the present invention is particularly excellent in easy tearability in the transverse direction (TD direction) perpendicular to the film flow direction.
  • the film of the present invention can be preferably used as various packaging materials (food packaging materials, medical packaging materials, etc.), container lid materials, labels, standing pouches, and the like. Moreover, although the film of this invention can be used individually, the film of this invention can be used as a sealant film, and a well-known base film can also be laminated
  • a lamination method a known lamination method such as an extrusion coating method, a hot lamination method, or a dry lamination method can be used.
  • the film of the present invention can be preferably used as a three-sided seal packaging material (packaging in which cup noodle ingredients are encapsulated), which is required to have good tearability in the transverse direction perpendicular to the film flow direction. .
  • the film of the present invention is also excellent in water vapor barrier properties. Therefore, the film of the present invention can be preferably used as a material such as a packaging material for storing substances or articles that need to be stored avoiding moisture such as powder.
  • the water vapor barrier property of the film of the present invention is specified by a moisture permeability test by a cup method according to JIS Z0208. It shows that water vapor
  • a three-layer inflation molding machine manufactured by Tommy Machinery Co., Ltd.
  • a three-layer multilayer coextruded film (total layer thickness: 50 ⁇ m) having an intermediate layer, an outer layer and an inner layer sandwiching the intermediate layer was prepared.
  • the molding conditions for the multilayer coextruded film are as follows.
  • the cylinder temperature of the outer layer and the inner layer of the film was set to 190 ° C.
  • the cylinder temperature of the intermediate layer of the film was set to 210 ° C.
  • the die temperature was set to 190 ° C.
  • the blow ratio was set to 2.0
  • the take-up speed was set to 12.5 m / min.
  • the intermediate layer of the multilayer coextruded film is composed of a composition in which a cyclic olefin resin is blended with a polyethylene resin in the ratios shown in Tables 1 and 2.
  • the outer and inner layers of the multilayer coextruded film are made of a polyethylene resin having the same composition as that in the intermediate layer.
  • total COC amount (A) means the content of the cyclic olefin resin contained in the entire multilayer coextruded film (that is, the cyclic olefin resin contained in the outer layer, the intermediate layer, and the inner layer). Total amount).
  • COC amount (B) of the intermediate layer indicates the content of the cyclic olefin resin contained in the intermediate layer of the multilayer coextruded film.
  • (B) / (A)” is a value obtained by dividing “COC amount of intermediate layer (B)” by “total COC amount (A)”.
  • the ratio of the thickness of each layer constituting the multilayer coextruded film is as shown in the “layer ratio” in the table (the numerical value indicates “the thickness of the outer layer: the thickness of the intermediate layer: the thickness of the inner layer”). .
  • LLDPE Trade name “Novatech UF230”, manufactured by Nippon Polyethylene Corporation
  • LDPE Trade name “Novatech LF342M”, manufactured by Nippon Polyethylene Corporation
  • Cyclic olefin resin Trade name “TOPAS8007F-500”, manufactured by Topas Advanced Polymers

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Abstract

 The objective of the present invention is to provide an easy-to-tear coextruded multilayer film that performs as a water-vapor barrier. Provided is a coextruded multilayer film having at least three layers, comprising an intermediate layer containing a cyclic olefin resin and a polyethylene resin, and outer layers containing a polyethylene resin and disposed on both outer sides sandwiching the intermediate layer, wherein the coextruded multilayer film is characterized in that the ratio (B)/(A) is 4 to 8, where (A) is the amount of the cyclic olefin resin contained in the coextruded multilayer film in percentage by mass, and (B) is the amount of the cyclic olefin resin contained in the intermediate layer in percentage by mass.

Description

多層共押出フィルムMultilayer coextrusion film
 本発明は、多層共押出フィルムに関する。 The present invention relates to a multilayer coextruded film.
 近年、バリアフリー等の観点から、包装材等の材料として使用されるフィルムに対して、手等で容易に引裂きやすい性質(以下、「易引裂き性」と言う)等を有することが求められている。このようなフィルムとして、易引裂き性を有する樹脂である環状オレフィン系樹脂を材料として使用したフィルムが挙げられる。例えば、特定の密度を有するポリエチレンを含む外層及び内層と、環状オレフィン系樹脂及び特定の密度を有するポリエチレンを含む中間層と、を積層させた多層フィルム(特許文献1)等が提案されている。 In recent years, from the viewpoint of barrier-free, etc., the film used as a packaging material or the like has been required to have a property that is easily tearable by hand (hereinafter referred to as “easy tearability”). Yes. An example of such a film is a film using a cyclic olefin resin, which is a resin having easy tearability, as a material. For example, a multilayer film (Patent Document 1) in which an outer layer and an inner layer containing polyethylene having a specific density and an intermediate layer containing a cyclic olefin-based resin and polyethylene having a specific density are laminated has been proposed.
 また、湿気を避ける必要がある物質や物品を包装するための包装材等については、その材料として使用されるフィルムに対して、易引裂き性だけではなく、包装材等の内部への水蒸気の透過を遮断する性質(以下、「水蒸気バリア性」と言う)を有することが求められ得る。 In addition, as for packaging materials for packaging materials and articles that need to avoid moisture, not only easy tearability but also permeation of water vapor into the packaging materials etc. It may be required to have a property of blocking water (hereinafter referred to as “water vapor barrier property”).
特開2012-885号公報JP 2012-885 A
 しかし、本発明者の検討の結果、良好な易引裂き性を多層フィルムに付与するには、フィルム全体における環状オレフィン系樹脂の含有量及び環状オレフィン系樹脂の分布が重要であることが見出された。他方、特許文献1における多層フィルムは、多層フィルム全体における環状オレフィン系樹脂の含有量及び分布について十分に検討されたものではないので、十分な易引裂き性を有さない可能性がある。また、特許文献1における多層フィルムにおいては、水蒸気バリア性について何ら検討されていない。 However, as a result of the study by the present inventors, it was found that the content of the cyclic olefin resin and the distribution of the cyclic olefin resin in the entire film are important for imparting good tearability to the multilayer film. It was. On the other hand, since the multilayer film in Patent Document 1 has not been sufficiently studied about the content and distribution of the cyclic olefin-based resin in the entire multilayer film, it may not have sufficient easy tearability. Moreover, in the multilayer film in patent document 1, nothing is examined about water vapor | steam barrier property.
 本発明は、上記課題を解決するためになされたものであり、易引裂き性及び水蒸気バリア性を有する多層共押出フィルムを提供することを目的とする。 The present invention has been made to solve the above-described problems, and an object thereof is to provide a multilayer coextruded film having easy tearability and water vapor barrier properties.
 本発明者は、環状オレフィン系樹脂とポリエチレン系樹脂とを含有する中間層と、該中間層を挟み両外側に配置され、ポリエチレン系樹脂を含有する外層と、で構成される3層以上の多層共押出フィルムにおいて、多層共押出フィルム中における環状オレフィン系樹脂の含有量と、中間層における環状オレフィン系樹脂の含有量と、の比率を所定の範囲にすることで上記課題を解決できることを見出し、本発明を完成するに至った。具体的には、本発明は下記のものを提供する。 The inventor has three or more multilayers composed of an intermediate layer containing a cyclic olefin-based resin and a polyethylene-based resin, and an outer layer disposed on both outer sides of the intermediate layer and containing a polyethylene-based resin. In the co-extruded film, it is found that the above-mentioned problem can be solved by setting the ratio of the content of the cyclic olefin resin in the multilayer co-extruded film and the content of the cyclic olefin resin in the intermediate layer to a predetermined range, The present invention has been completed. Specifically, the present invention provides the following.
 (1) 環状オレフィン系樹脂とポリエチレン系樹脂とを含有する中間層と、
 該中間層を挟み両外側に配置され、ポリエチレン系樹脂を含有する外層と、
で構成される3層以上の多層共押出フィルムであって、
 前記多層共押出フィルム中における前記環状オレフィン系樹脂の含有量を(A)質量%とし、前記中間層における前記環状オレフィン系樹脂の含有量を(B)質量%とした際に、
 (A)に対する(B)の比である(B)/(A)が4以上8以下であることを特徴とする多層共押出フィルム。
(1) an intermediate layer containing a cyclic olefin resin and a polyethylene resin;
An outer layer disposed on both outer sides of the intermediate layer and containing a polyethylene resin;
A multilayer coextruded film of 3 or more layers, comprising:
When the content of the cyclic olefin resin in the multilayer coextruded film is (A) mass% and the content of the cyclic olefin resin in the intermediate layer is (B) mass%,
A multilayer coextruded film, wherein (B) / (A), which is the ratio of (B) to (A), is 4 or more and 8 or less.
 (2) 前記(A)質量%が、5質量%以上20%未満である(1)記載の多層共押出フィルム。 (2) The multilayer coextruded film according to (1), wherein the (A) mass% is 5 mass% or more and less than 20%.
 (3) 前記(B)質量%が、30質量%以上95質量%未満である(1)又は(2)に記載の多層共押出フィルム。 (3) The multilayer coextruded film according to (1) or (2), wherein the (B) mass% is 30 mass% or more and less than 95 mass%.
 (4) 前記中間層のポリエチレン系樹脂が、直鎖状低密度ポリエチレン(LLDPE)と高圧法低密度ポリエチレン(LDPE)との混合物である(1)から(3)のいずれかに記載の多層共押出フィルム。 (4) The multilayer copolymer according to any one of (1) to (3), wherein the polyethylene-based resin of the intermediate layer is a mixture of linear low-density polyethylene (LLDPE) and high-pressure method low-density polyethylene (LDPE). Extruded film.
 (5) 前記外層のポリエチレン系樹脂が、直鎖状低密度ポリエチレン(LLDPE)と高圧法低密度ポリエチレン(LDPE)との混合物である(1)から(4)のいずれかに記載の多層共押出フィルム。 (5) The multilayer coextrusion according to any one of (1) to (4), wherein the polyethylene resin of the outer layer is a mixture of linear low density polyethylene (LLDPE) and high pressure method low density polyethylene (LDPE). the film.
 (6) ブロー比1.5から4.0のインフレーション法によって成形された(1)から(5)のいずれかに記載の多層共押出フィルム。 (6) The multilayer coextruded film according to any one of (1) to (5), which is formed by an inflation method having a blow ratio of 1.5 to 4.0.
 本発明によれば、易引裂き性及び水蒸気バリア性を有する多層共押出フィルムが提供される。 According to the present invention, a multilayer coextruded film having easy tearability and water vapor barrier properties is provided.
 以下、本発明の実施形態について説明する。なお、本発明は以下の実施形態に限定されない。 Hereinafter, embodiments of the present invention will be described. In addition, this invention is not limited to the following embodiment.
<多層共押出フィルムの構成>
 本発明の多層共押出フィルム(以下、「本発明のフィルム」とも言う)は、環状オレフィン系樹脂とポリエチレン系樹脂とを含有する中間層と、該中間層を挟み両外側に配置され、ポリエチレン系樹脂を含有する2つの外層と、で構成される3層以上の多層共押出フィルムである。
<Configuration of multilayer coextruded film>
A multilayer coextruded film of the present invention (hereinafter also referred to as “film of the present invention”) is disposed on both outer sides of an intermediate layer containing a cyclic olefin-based resin and a polyethylene-based resin. A multilayer coextruded film of 3 or more layers composed of two outer layers containing a resin.
 本発明のフィルムは、フィルム全体における環状オレフィン系樹脂の含有量と、中間層における環状オレフィン系樹脂の含有量との質量比が所定の範囲となるように調製される。具体的には、本発明のフィルムは、本発明のフィルム中における環状オレフィン系樹脂の含有量を(A)質量%とし、中間層における環状オレフィン系樹脂の含有量を(B)質量%とした際に、(A)に対する(B)の比、つまり(B)を(A)で割った値である、「(B)/(A)」が4以上8以下となるように調製される。 The film of the present invention is prepared such that the mass ratio of the content of the cyclic olefin resin in the entire film and the content of the cyclic olefin resin in the intermediate layer is within a predetermined range. Specifically, in the film of the present invention, the content of the cyclic olefin resin in the film of the present invention is (A) mass%, and the content of the cyclic olefin resin in the intermediate layer is (B) mass%. In this case, the ratio of (B) to (A), that is, (B) / (A), which is a value obtained by dividing (B) by (A), is adjusted to 4 or more and 8 or less.
 「(B)/(A)」が4以上8以下であることは、本発明のフィルムにおける中間層の厚さが、他層(外層)の厚さの合計値と比較して相対的に薄く、かつ、中間層中の環状オレフィン系樹脂の濃度が、他層中の環状オレフィン系樹脂の濃度と比較して相対的に高いことを意味する。つまり、本発明のフィルムにおいては、環状オレフィン系樹脂が、厚さが薄い中間層中に高密度に存在する。本発明者は、このような構成を有する多層共押出フィルムによれば、フィルム中に含まれる環状オレフィン系樹脂の総量が従来よりも少ない場合であっても、優れた易引裂き性、さらには優れた水蒸気バリア性をも実現できることを初めて見出した。 The fact that “(B) / (A)” is 4 or more and 8 or less indicates that the thickness of the intermediate layer in the film of the present invention is relatively thin compared to the total thickness of the other layers (outer layers). And the density | concentration of the cyclic olefin resin in an intermediate | middle layer means that it is relatively high compared with the density | concentration of the cyclic olefin resin in another layer. That is, in the film of the present invention, the cyclic olefin-based resin is present at high density in the thin intermediate layer. According to the multilayer coextruded film having such a configuration, the present inventor has excellent easy tearability, and further excellent, even when the total amount of the cyclic olefin-based resin contained in the film is smaller than the conventional amount. It has been found for the first time that a water vapor barrier property can be realized.
 「(B)/(A)」が4以上、好ましくは4.5以上、さらに好ましくは5以上であると、十分な易引裂き性及び水蒸気バリア性を多層共押出フィルムに付与できる。「(B)/(A)」が高いほど(特に7~8であると)、易引裂き性及び水蒸気バリア性に優れた多層共押出フィルムを得やすい。 When “(B) / (A)” is 4 or more, preferably 4.5 or more, and more preferably 5 or more, sufficient easy tearability and water vapor barrier property can be imparted to the multilayer coextruded film. The higher “(B) / (A)” (especially 7 to 8), the easier it is to obtain a multilayer coextruded film excellent in easy tearing and water vapor barrier properties.
 「(B)/(A)」が8以下、好ましくは7.5以下、さらに好ましくは7以下であると、多層共押出フィルム中の環状オレフィン系樹脂の含有量が過度ではないので、フィルム中に含まれる他の樹脂等が有する特性を損ないにくいだけでなく、コストを抑制できる。「(B)/(A)」が8超である場合、中間層の厚さと、他層の厚さの合計値との差が大きくなる可能性があり、その結果、得られる多層共押出フィルムの易引裂き性及び水蒸気バリア性にバラツキが生じる。このような易引裂き性及び水蒸気バリア性のバラツキは、中間層が薄くなるほど生じやすい(例えば、外層の厚さ:中間層の厚さ:内層の厚さ=4:1:4である場合等)。 When “(B) / (A)” is 8 or less, preferably 7.5 or less, more preferably 7 or less, the content of the cyclic olefin-based resin in the multilayer coextruded film is not excessive. In addition to not easily damaging the properties of other resins contained in the resin, it is possible to reduce costs. When “(B) / (A)” is more than 8, the difference between the thickness of the intermediate layer and the total thickness of the other layers may increase, and as a result, the resulting multilayer coextruded film Variation in easy tearability and water vapor barrier property. Such variations in easy tearability and water vapor barrier properties are more likely to occur as the intermediate layer becomes thinner (for example, when the thickness of the outer layer: the thickness of the intermediate layer: the thickness of the inner layer = 4: 1: 4). .
 「(A)質量%」は、上述の「(B)/(A)」を満たす限り特に限定されないが、5質量%以上20%未満、好ましくは10質量%以上20%未満、さらに好ましくは5質量%以上18%以下であってもよい。本発明によれば、フィルム中における環状オレフィン系樹脂の含有量が5質量%以上20%未満という少量であっても、フィルムに十分な易引裂き性及び水蒸気バリア性を付与できる。「(A)質量%」が高いほど(例えば13~17質量%であると)、水蒸気バリア性に特に優れた多層共押出フィルムを得やすい。 “(A) mass%” is not particularly limited as long as the above-mentioned “(B) / (A)” is satisfied, but it is 5% by mass or more and less than 20%, preferably 10% by mass or more and less than 20%, more preferably 5%. It may be from 18% to 18% by mass. According to the present invention, even if the content of the cyclic olefin resin in the film is a small amount of 5% by mass or more and less than 20%, sufficient easy tearability and water vapor barrier property can be imparted to the film. The higher “(A) mass%” (for example, 13 to 17 mass%), the easier it is to obtain a multilayer coextruded film that is particularly excellent in water vapor barrier properties.
 「(B)質量%」は、上述の「(B)/(A)」を満たす限り特に限定されないが、30質量%以上95質量%未満、好ましくは50質量%以上95質量%未満、さらに好ましくは60質量%以上95質量%未満であってもよい。中間層中の環状オレフィン系樹脂の含有量がかかる範囲であり、かつ、中間層にポリエチレン系樹脂が含まれていると、フィルムに十分な易引裂き性及び水蒸気バリア性を付与できる。なお、中間層に環状オレフィン系樹脂しか含まれない場合(つまり、「(B)質量%」が100質量%である場合)、得られたフィルムは容易に引裂くことができず、良好な易引裂き性を有さない。 “(B) mass%” is not particularly limited as long as the above-mentioned “(B) / (A)” is satisfied, but it is 30% by mass or more and less than 95% by mass, preferably 50% by mass or more and less than 95% by mass, and more preferably. 60 mass% or more and less than 95 mass% may be sufficient. When the content of the cyclic olefin-based resin in the intermediate layer is within such a range, and the polyethylene-based resin is included in the intermediate layer, sufficient easy tearability and water vapor barrier properties can be imparted to the film. When the intermediate layer contains only the cyclic olefin-based resin (that is, when “(B) mass%” is 100 mass%), the obtained film cannot be easily torn, and good easy Does not tear.
 中間層を挟み、中間層の両外側に配置される2つの外層は、ポリエチレン系樹脂を含む。該外層はポリエチレン系樹脂からなるものもよく、上述の「(B)/(A)」を満たす限り、環状オレフィン系樹脂を含んでいてもよい。2つの外層は、フィルムのカールを防ぐことができるという点で、同一組成を有し、かつ/又は、同一の厚さであることが好ましい。 The two outer layers arranged on both outer sides of the intermediate layer including the intermediate layer contain a polyethylene resin. The outer layer may be made of a polyethylene-based resin, and may contain a cyclic olefin-based resin as long as the above “(B) / (A)” is satisfied. The two outer layers preferably have the same composition and / or the same thickness in that the curl of the film can be prevented.
(環状オレフィン系樹脂)
 本発明における環状オレフィン系樹脂は、環状オレフィンに由来する構造単位を主鎖に含む重合体又は共重合体であれば、特に限定されない。例えば、環状オレフィンの付加重合体又はその水素添加物、環状オレフィンとα-オレフィンとの付加共重合体又はその水素添加物等を挙げることができる。環状オレフィン系樹脂は、1種単独で使用することも、2種以上を併用することもできる。
(Cyclic olefin resin)
The cyclic olefin resin in the present invention is not particularly limited as long as it is a polymer or copolymer containing a structural unit derived from a cyclic olefin in the main chain. For example, an addition polymer of a cyclic olefin or a hydrogenated product thereof, an addition copolymer of a cyclic olefin and an α-olefin, or a hydrogenated product thereof can be used. A cyclic olefin resin can be used individually by 1 type, or can also use 2 or more types together.
 また、環状オレフィン系樹脂としては、環状オレフィンに由来する構造単位を主鎖に含む上記重合体又は上記共重合体において、さらに極性基を有する不飽和化合物がグラフト及び/又は共重合したものも挙げられる。 In addition, examples of the cyclic olefin-based resin include those obtained by grafting and / or copolymerizing an unsaturated compound having a polar group in the polymer or the copolymer containing a structural unit derived from a cyclic olefin in the main chain. It is done.
 極性基としては、例えば、カルボキシル基、酸無水物基、エポキシ基、アミド基、エステル基、ヒドロキシル基等を挙げることができ、極性基を有する不飽和化合物としては、(メタ)アクリル酸、マレイン酸、無水マレイン酸、無水イタコン酸、グリシジル(メタ)アクリレート、(メタ)アクリル酸アルキル(炭素数1~10)エステル、マレイン酸アルキル(炭素数1~10)エステル、(メタ)アクリルアミド、(メタ)アクリル酸-2-ヒドロキシエチル等を挙げることができる。 Examples of the polar group include a carboxyl group, an acid anhydride group, an epoxy group, an amide group, an ester group, and a hydroxyl group. Examples of the unsaturated compound having a polar group include (meth) acrylic acid and maleic acid. Acid, maleic anhydride, itaconic anhydride, glycidyl (meth) acrylate, alkyl (meth) acrylate (carbon number 1-10) ester, alkyl maleate (carbon number 1-10) ester, (meth) acrylamide, (meta And 2-hydroxyethyl acrylate.
 また、本発明において環状オレフィン系樹脂として用いられる上記共重合体としては、市販の樹脂を用いることも可能である。市販されている環状オレフィン系樹脂としては、例えば、TOPAS(登録商標)(Topas Advanced Polymers社製)、アペル(登録商標)(三井化学社製)、ゼオネックス(登録商標)(日本ゼオン社製)、ゼオノア(登録商標)(日本ゼオン社製)、アートン(登録商標)(JSR社製)等を挙げることができる。 Further, as the copolymer used as the cyclic olefin resin in the present invention, a commercially available resin can be used. Examples of commercially available cyclic olefin-based resins include TOPAS (registered trademark) (Topas Advanced Polymers), Apel (registered trademark) (Mitsui Chemicals), Zeonex (registered trademark) (manufactured by Nippon Zeon), Examples include ZEONOR (registered trademark) (manufactured by ZEON Corporation), ARTON (registered trademark) (manufactured by JSR Corporation), and the like.
 環状オレフィンとα-オレフィンとの付加共重合体として、特に好ましい例としては、〔1〕炭素数2~20のα-オレフィンに由来する構造単位と、〔2〕下記一般式(I)で示される環状オレフィンに由来する構造単位と、を含む共重合体を挙げることができる。
Figure JPOXMLDOC01-appb-C000001
(式中、R~R12は、それぞれ同一でも異なっていてもよく、水素原子、ハロゲン原子、及び、炭化水素基からなる群より選ばれるものであり、
 RとR10、R11とR12は、一体化して2価の炭化水素基を形成してもよく、
 R又はR10と、R11又はR12とは、互いに環を形成していてもよい。
 また、nは、0又は正の整数を示し、
 nが2以上の場合には、R~Rは、それぞれの繰り返し単位の中で、それぞれ同一でも異なっていてもよい。)
Particularly preferred examples of the addition copolymer of cyclic olefin and α-olefin include [1] a structural unit derived from an α-olefin having 2 to 20 carbon atoms, and [2] represented by the following general formula (I). And a copolymer containing a structural unit derived from a cyclic olefin.
Figure JPOXMLDOC01-appb-C000001
(Wherein R 1 to R 12 may be the same or different and are each selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group;
R 9 and R 10 , R 11 and R 12 may be integrated to form a divalent hydrocarbon group,
R 9 or R 10 and R 11 or R 12 may form a ring with each other.
N represents 0 or a positive integer;
When n is 2 or more, R 5 to R 8 may be the same or different in each repeating unit. )
〔〔1〕炭素数2~20のα-オレフィン〕
 炭素数2~20のα-オレフィンは、特に限定されるものではない。例えば、特開2007-302722と同様のものを挙げることができる。また、これらのα-オレフィンは、1種単独でも2種以上を組み合わせて使用してもよい。これらの中では、エチレンの単独使用が最も好ましい。
[[1] α-olefin having 2 to 20 carbon atoms]
The α-olefin having 2 to 20 carbon atoms is not particularly limited. For example, the same ones as in JP2007-302722 can be mentioned. These α-olefins may be used singly or in combination of two or more. Of these, ethylene is most preferably used alone.
〔〔2〕一般式(I)で示される環状オレフィン〕
 一般式(I)で示される環状オレフィンについて説明する。一般式(I)におけるR~R12は、それぞれ同一でも異なっていてもよく、水素原子、ハロゲン原子、及び、炭化水素基からなる群より選ばれるものである。一般式(I)で示される環状オレフィンの具体例としては、特開2007-302722と同様のものを挙げることができる。
[[2] Cyclic olefin represented by general formula (I)]
The cyclic olefin represented by the general formula (I) will be described. R 1 to R 12 in the general formula (I) may be the same or different and are selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group. Specific examples of the cyclic olefin represented by the general formula (I) include those similar to those described in JP-A-2007-302722.
 これらの環状オレフィンは、1種単独でも、また2種以上を組み合わせて使用してもよい。これらの中では、ビシクロ[2.2.1]ヘプタ-2-エン(慣用名:ノルボルネン)を単独使用することが好ましい。 These cyclic olefins may be used singly or in combination of two or more. Among these, it is preferable to use bicyclo [2.2.1] hept-2-ene (common name: norbornene) alone.
 〔1〕炭素数2~20のα-オレフィンと〔2〕一般式(I)で表される環状オレフィンとの重合方法及び得られた重合体の水素添加方法は、特に限定されるものではなく、公知の方法に従って行うことができる。 [1] The polymerization method of the α-olefin having 2 to 20 carbon atoms and the cyclic olefin represented by [2] general formula (I) and the hydrogenation method of the obtained polymer are not particularly limited. Can be carried out according to a known method.
 また、用いられる重合触媒についても特に限定されるものではなく、チーグラー・ナッタ系、メタセシス系、メタロセン系触媒等の従来周知の触媒を用いて周知の方法により環状オレフィン系樹脂を得ることができる。 The polymerization catalyst used is not particularly limited, and a cyclic olefin resin can be obtained by a known method using a conventionally known catalyst such as a Ziegler-Natta, metathesis, or metallocene catalyst.
 環状オレフィン系樹脂のガラス転移点は30℃以上140℃以下であることが好ましい。環状オレフィン系樹脂のガラス転移点が30℃以上であれば、成形時におけるペレット同士のブロッキングを防止できる点で好ましい。環状オレフィン系樹脂のガラス転移点が140℃以下であれば、ポリエチレン系樹脂の加工温度と近いので、樹脂のブレンド等が容易であるため理由で好ましい。なお、環状オレフィン系樹脂のガラス転移点の調整は、主鎖の環状オレフィン骨格の含有量を調整することで行うことができる。また、ガラス転移点は、DSC法(JIS K7121記載の方法)によって昇温速度10℃/分の条件で測定した値を採用する。 The glass transition point of the cyclic olefin resin is preferably 30 ° C. or higher and 140 ° C. or lower. If the glass transition point of cyclic olefin resin is 30 degreeC or more, it is preferable at the point which can prevent the blocking of the pellets at the time of shaping | molding. If the glass transition point of cyclic olefin resin is 140 degrees C or less, since it is close to the processing temperature of polyethylene resin, it is preferable for the reason that resin blending is easy. The glass transition point of the cyclic olefin resin can be adjusted by adjusting the content of the cyclic olefin skeleton of the main chain. As the glass transition point, a value measured by a DSC method (method described in JIS K7121) under a temperature rising rate of 10 ° C./min is employed.
(ポリエチレン系樹脂)
 本発明におけるポリエチレン系樹脂としては、フィルムに通常使用されるものを使用できる。例えば、直鎖状低密度ポリエチレン(LLDPE)、高圧法低密度ポリエチレン(LDPE)及び高密度ポリエチレン(HDPE)、エチレン酢酸ビニル共重合体(EVA)、エチレン系アイオノマー、ポリエチレンエラストマー等が挙げられる。上記の樹脂は、1種単独でも2種以上を組み合わせて使用してもよい。上記の樹脂を組み合わせて使用する場合、その割合は、得ようとするフィルムの加工性等に応じて適宜調整できる。
(Polyethylene resin)
As a polyethylene-type resin in this invention, what is normally used for a film can be used. Examples thereof include linear low density polyethylene (LLDPE), high pressure method low density polyethylene (LDPE) and high density polyethylene (HDPE), ethylene vinyl acetate copolymer (EVA), ethylene ionomer, and polyethylene elastomer. The above resins may be used alone or in combination of two or more. When the above resins are used in combination, the ratio can be appropriately adjusted according to the processability of the film to be obtained.
 上記の樹脂のうち、加工のしやすさ等の成形安定性が優れている点で、LLDPEが好ましい。フィルムの成形安定性に加えて、得られるフィルムの透明性を向上できる点で、LLDPEとLDPEとの混合物が特に好ましい。本発明におけるポリエチレン系樹脂として、LLDPEとLDPEとの混合物を使用する場合、これらの樹脂の質量比は、LLDPE:LDPE=95:5~60:40であってもよい。 Of the above resins, LLDPE is preferable in terms of excellent molding stability such as ease of processing. A mixture of LLDPE and LDPE is particularly preferable in that the transparency of the resulting film can be improved in addition to the film forming stability. When a mixture of LLDPE and LDPE is used as the polyethylene resin in the present invention, the mass ratio of these resins may be LLDPE: LDPE = 95: 5 to 60:40.
 中間層及び外層において使用されるポリエチレン系樹脂は同一の組成であってもよく、異なる組成であってもよい。例えば、中間層と外層とでポリエチレン系樹脂の組成が異なっていてもよいし、2つの外層におけるポリエチレン系樹脂がそれぞれ異なっていてもよい。フィルムのカールを防ぐことができるという点で、中間層を挟む2つの外層において使用されるポリエチレン系樹脂は同一の組成であることが好ましい。優れた易引裂き性及び成形安定性を有するフィルムが得られるという点で、中間層及び外層におけるポリエチレン系樹脂は、同一組成であることが好ましく、同一組成を有するLLDPEとLDPEとの混合物であることがさらに好ましい。 The polyethylene resin used in the intermediate layer and the outer layer may have the same composition or different compositions. For example, the composition of the polyethylene resin may be different between the intermediate layer and the outer layer, and the polyethylene resins in the two outer layers may be different from each other. In terms of preventing curling of the film, the polyethylene resins used in the two outer layers sandwiching the intermediate layer preferably have the same composition. The polyethylene resin in the intermediate layer and the outer layer preferably have the same composition in that a film having excellent easy tearability and molding stability is obtained, and is a mixture of LLDPE and LDPE having the same composition. Is more preferable.
(その他の成分)
 中間層及び外層には、本発明の目的を阻害しない範囲で、フィルムの成分として通常使用される成分を適宜配合してもよい。このような成分としては、環状オレフィン系樹脂及びポリエチレン系樹脂以外の樹脂(ポリエステル系樹脂等)、スリップ剤、酸化防止剤、二次酸化防止剤、着色剤、中和剤、分散剤、光安定剤、紫外線吸収剤、滑剤、帯電防止剤、防曇剤、核剤、顔料、着色剤、難燃剤、アンチブロッキング剤や、その他の各種有機無機化合物等が挙げられる。これらの成分の配合量は、得ようとする効果等に応じて適宜調整される。
(Other ingredients)
In the intermediate layer and the outer layer, components usually used as components of the film may be appropriately blended within a range not impairing the object of the present invention. Such components include resins other than cyclic olefin resins and polyethylene resins (polyester resins, etc.), slip agents, antioxidants, secondary antioxidants, colorants, neutralizers, dispersants, light stability Agents, ultraviolet absorbers, lubricants, antistatic agents, antifogging agents, nucleating agents, pigments, colorants, flame retardants, antiblocking agents, and other various organic and inorganic compounds. The blending amount of these components is appropriately adjusted according to the effect to be obtained.
<本発明のフィルムの製造方法>
 本発明のフィルムの製造方法は特に限定されず、例えば、従来公知の押出成形法(Tダイ多層共押出法等)やインフレーション法により製造することができる。
<The manufacturing method of the film of this invention>
The method for producing the film of the present invention is not particularly limited. For example, the film can be produced by a conventionally known extrusion method (T-die multilayer coextrusion method or the like) or an inflation method.
 インフレーション法によって本発明のフィルムを製造する場合、ブロー比は、1.5から4.0であることが好ましい。ブロー比がかかる範囲であると、フィルムの流れ方向に直交する横方向(TD方向)の延伸効果が特に高まるので、易引裂き性を有するフィルムを成形しやすい点で好ましい。 When the film of the present invention is produced by an inflation method, the blow ratio is preferably 1.5 to 4.0. When the blow ratio is within such a range, the stretching effect in the transverse direction (TD direction) perpendicular to the film flow direction is particularly enhanced, which is preferable in that a film having easy tearability can be easily formed.
 本発明のフィルムにおける中間層、及び該中間層を挟み両外側に配置される2つの外層(以下、中間層を挟む2つの外層を「内層及び外層」とも言う)の厚さの構成比は、特に限定されない。ただし、「(B)/(A)」を上述の範囲に調整すると、中間層の厚さが、内層及び外層の厚さの合計と比較して薄くなり得る。本発明の効果が得られやすい点で、中間層の厚さは、内層の厚さ及び外層の厚さのそれぞれと比較して薄いことが好ましい。 The composition ratio of the thickness of the intermediate layer in the film of the present invention and the two outer layers disposed on both outer sides of the intermediate layer (hereinafter, the two outer layers sandwiching the intermediate layer are also referred to as “inner layer and outer layer”) There is no particular limitation. However, when “(B) / (A)” is adjusted to the above range, the thickness of the intermediate layer can be reduced as compared with the total thickness of the inner layer and the outer layer. It is preferable that the thickness of the intermediate layer is thinner than the thickness of the inner layer and the thickness of the outer layer in that the effects of the present invention can be easily obtained.
 例えば、本発明のフィルムにおける各層の厚さの比率は、外層の厚さ:中間層の厚さ:内層の厚さ=3:1:3~1.5:1:1.5であってもよい。内層の厚さ及び外層の厚さは、フィルムのカールを防ぐことができるという点で、同一であることが好ましい。 For example, the ratio of the thickness of each layer in the film of the present invention is as follows: outer layer thickness: intermediate layer thickness: inner layer thickness = 3: 1: 3 to 1.5: 1: 1.5 Good. The thickness of the inner layer and the thickness of the outer layer are preferably the same in that the curling of the film can be prevented.
 本発明のフィルムは、中間層、内層及び外層の3層に加えて、第2中間層、第3中間層等のさらなる層を有していてもよい。つまり、中間層は複数の層からなるものであってもよい。かかる場合、内層及び外層以外の、複数の層からなる中間層中の環状オレフィン系樹脂の総量が、上述の「(B)/(A)」を満たすようにフィルムを調製することで、本発明のフィルムが得られる。 The film of the present invention may have additional layers such as a second intermediate layer and a third intermediate layer in addition to the intermediate layer, the inner layer and the outer layer. That is, the intermediate layer may be composed of a plurality of layers. In such a case, the present invention is prepared by preparing a film so that the total amount of the cyclic olefin-based resin in the intermediate layer composed of a plurality of layers other than the inner layer and the outer layer satisfies the above-mentioned “(B) / (A)”. Film is obtained.
 本発明のフィルムの全層厚さ(つまり、外層の厚さ、中間層の厚さ、及び内層の厚さの合計値)は、特に限定されない。本発明のフィルムの全層厚さは、例えば、20μm以上200μm以下に調整できる。 The total layer thickness (that is, the total thickness of the outer layer, the intermediate layer, and the inner layer) of the film of the present invention is not particularly limited. The total thickness of the film of the present invention can be adjusted to, for example, 20 μm or more and 200 μm or less.
<本発明のフィルムの性質>
 本発明のフィルムは、易引裂き性に優れる。本発明のフィルムの易引裂き性は、JIS K7128及びJIS P8116に準じたエルメンドルフ引裂き試験で特定する。得られた値が低い程、引裂き強度が低く、易引裂き性に優れることを示す。本発明のフィルムは、フィルムの流れ方向に直交する横方向(TD方向)の易引裂き性が特に優れている。
<Properties of the film of the present invention>
The film of the present invention is excellent in easy tearability. The easy tearability of the film of the present invention is specified by an Elmendorf tear test according to JIS K7128 and JIS P8116. The lower the obtained value, the lower the tear strength and the better the easy tearability. The film of the present invention is particularly excellent in easy tearability in the transverse direction (TD direction) perpendicular to the film flow direction.
 本発明のフィルムは、各種包装材(食品包装材、医療包装材等)や、容器の蓋材、ラベル、スタンディングパウチ等として好ましく使用できる。また、本発明のフィルムは、単独でも使用できるが、本発明のフィルムをシーラントフィルムとして使用し、本発明のフィルムに公知の基材フィルムを積層させることもできる。積層の方法としては、押出コーティング法、ホットラミネーション法、ドライラミネーション法等の公知ラミネート方法を使用できる。 The film of the present invention can be preferably used as various packaging materials (food packaging materials, medical packaging materials, etc.), container lid materials, labels, standing pouches, and the like. Moreover, although the film of this invention can be used individually, the film of this invention can be used as a sealant film, and a well-known base film can also be laminated | stacked on the film of this invention. As a lamination method, a known lamination method such as an extrusion coating method, a hot lamination method, or a dry lamination method can be used.
 また、本発明のフィルムは、フィルムの流れ方向に直交する横方向の易引裂き性が良好であることが求められる、三方シール包装材(カップ麺具材等が封入される包装)として好ましく使用できる。 In addition, the film of the present invention can be preferably used as a three-sided seal packaging material (packaging in which cup noodle ingredients are encapsulated), which is required to have good tearability in the transverse direction perpendicular to the film flow direction. .
 本発明のフィルムは、水蒸気バリア性にも優れる。従って、本発明のフィルムは、粉体等の湿気を避けて保存する必要がある物質や物品を保存するための包装材等の材料として好ましく使用できる。本発明のフィルムの水蒸気バリア性は、JIS Z0208に準じてカップ法による透湿度試験で特定する。得られた透湿度の値が低いほど水蒸気バリア性が優れていることを示す。 The film of the present invention is also excellent in water vapor barrier properties. Therefore, the film of the present invention can be preferably used as a material such as a packaging material for storing substances or articles that need to be stored avoiding moisture such as powder. The water vapor barrier property of the film of the present invention is specified by a moisture permeability test by a cup method according to JIS Z0208. It shows that water vapor | steam barrier property is excellent, so that the value of the obtained water vapor transmission rate is low.
 以下、実施例を示し、本発明を具体的に説明するが、本発明はこれらの実施例に限定されるものではない。 Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to these examples.
 三層インフレーション成形機(トミー機械工業株式会社製)を用いて、中間層、該中間層を挟む外層及び内層を有する3層の多層共押出フィルム(全層厚さ:50μm)を調製した。多層共押出フィルムの成形条件は下記の通りである。 Using a three-layer inflation molding machine (manufactured by Tommy Machinery Co., Ltd.), a three-layer multilayer coextruded film (total layer thickness: 50 μm) having an intermediate layer, an outer layer and an inner layer sandwiching the intermediate layer was prepared. The molding conditions for the multilayer coextruded film are as follows.
[成形条件]
 ダイス(ダイ口径:106mm、リップクリアランス:2.5mm)及びスクリュー(φ=40mm、L/D=26)を使用して多層共押出フィルムを作成した。なお、フィルムの外層及び内層のシリンダー温度は190℃に設定し、フィルムの中間層のシリンダー温度は210℃に設定した。また、ダイスの温度は190℃、ブロー比は2.0、引き取り速度は12.5m/minにそれぞれ設定した。
[Molding condition]
A multilayer coextruded film was prepared using a die (die diameter: 106 mm, lip clearance: 2.5 mm) and a screw (φ = 40 mm, L / D = 26). The cylinder temperature of the outer layer and the inner layer of the film was set to 190 ° C., and the cylinder temperature of the intermediate layer of the film was set to 210 ° C. The die temperature was set to 190 ° C., the blow ratio was set to 2.0, and the take-up speed was set to 12.5 m / min.
 多層共押出フィルムの中間層は、ポリエチレン系樹脂に、表1及び2に示す割合で環状オレフィン系樹脂を配合した組成物からなる。該ポリエチレン系樹脂は、LLDPE及びLDPEからなり、その質量比はLLDPE:LDPE=4:1である。 The intermediate layer of the multilayer coextruded film is composed of a composition in which a cyclic olefin resin is blended with a polyethylene resin in the ratios shown in Tables 1 and 2. The polyethylene resin is composed of LLDPE and LDPE, and the mass ratio thereof is LLDPE: LDPE = 4: 1.
 多層共押出フィルムの外層及び内層は、中間層におけるものと同一の組成を有するポリエチレン系樹脂からなる。 The outer and inner layers of the multilayer coextruded film are made of a polyethylene resin having the same composition as that in the intermediate layer.
 なお、表中、「全体のCOC量(A)」とは、多層共押出フィルムの全体中に含まれる環状オレフィン系樹脂の含有量(つまり、外層、中間層及び内層に含まれる環状オレフィン系樹脂の総量)を示す。また、「中間層のCOC量(B)」とは、多層共押出フィルムの中間層中に含まれる環状オレフィン系樹脂の含有量を示す。表中、「(B)/(A)」とは、「中間層のCOC量(B)」を「全体のCOC量(A)」で割った値である。 In the table, “total COC amount (A)” means the content of the cyclic olefin resin contained in the entire multilayer coextruded film (that is, the cyclic olefin resin contained in the outer layer, the intermediate layer, and the inner layer). Total amount). In addition, the “COC amount (B) of the intermediate layer” indicates the content of the cyclic olefin resin contained in the intermediate layer of the multilayer coextruded film. In the table, “(B) / (A)” is a value obtained by dividing “COC amount of intermediate layer (B)” by “total COC amount (A)”.
 多層共押出フィルムを構成する各層の厚さの比率は、表中の「層比」(数値は「外層の厚さ:中間層の厚さ:内層の厚さ」を示す)に示す通りである。 The ratio of the thickness of each layer constituting the multilayer coextruded film is as shown in the “layer ratio” in the table (the numerical value indicates “the thickness of the outer layer: the thickness of the intermediate layer: the thickness of the inner layer”). .
 使用した材料の詳細は下記の通りである。
 LLDPE:商品名「ノバテックUF230」、日本ポリエチレン株式会社製
 LDPE:商品名「ノバテックLF342M」、日本ポリエチレン株式会社製
 環状オレフィン系樹脂:商品名「TOPAS8007F-500」、Topas Advanced Polymers社製
Details of the materials used are as follows.
LLDPE: Trade name “Novatech UF230”, manufactured by Nippon Polyethylene Corporation LDPE: Trade name “Novatech LF342M”, manufactured by Nippon Polyethylene Corporation Cyclic olefin resin: Trade name “TOPAS8007F-500”, manufactured by Topas Advanced Polymers
[引裂き強度の測定]
 上記実施例及び比較例の多層共押出フィルムについて、JIS K7128及びJIS P8116に準じてエルメンドルフ引裂き試験を行い、各多層共押出フィルムの引裂き強度を測定した。その結果を表1及び2に示す。なお、表中、「縦」とは、多層共押出フィルムを縦方向(MD方向)に裂いたときの強度を示す。また、「横」とは、多層共押出フィルムを横方向(TD方向)に裂いたときの強度を示す。これらの値が低いほど易引裂き性が優れていることを示す。
[Measurement of tear strength]
About the multilayer coextrusion film of the said Example and the comparative example, the Elmendorf tear test was done according to JISK7128 and JISP8116, and the tear strength of each multilayer coextrusion film was measured. The results are shown in Tables 1 and 2. In the table, “longitudinal” indicates strength when the multilayer coextruded film is torn in the longitudinal direction (MD direction). Further, “lateral” indicates strength when the multilayer coextruded film is torn in the lateral direction (TD direction). The lower these values, the better the tearability.
[透湿度の測定]
 上記実施例及び比較例の多層共押出フィルムについて、JIS Z0208に準じてカップ法による透湿度試験を行い、各多層共押出フィルムの透湿度を測定した。温湿度条件は、温度40℃、湿度90%に設定した。その結果を表1及び表2に示す。透湿度が低いほど水蒸気バリア性が優れていることを示す。
[Measurement of moisture permeability]
About the multilayer coextrusion film of the said Example and comparative example, the water vapor permeability test by the cup method was done according to JISZ0208, and the water vapor permeability of each multilayer coextrusion film was measured. The temperature and humidity conditions were set to a temperature of 40 ° C. and a humidity of 90%. The results are shown in Tables 1 and 2. The lower the moisture permeability, the better the water vapor barrier property.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
 表1及び2に示される通り、「(B)/(A)」が本発明の範囲であると、縦方向及び横方向のいずれの方向についても引裂き強度が低く、易引裂き性に優れた多層共押出フィルムが得られる。特に、本発明のフィルムは横方向の易引裂き性が優れていた。目視ではいずれのフィルムについても透明性に差はなかった(データは示していない)。 As shown in Tables 1 and 2, when “(B) / (A)” is within the scope of the present invention, a multilayer having low tear strength in both the longitudinal direction and the transverse direction and excellent in easy tearability. A coextruded film is obtained. In particular, the film of the present invention was excellent in easy tearability in the lateral direction. Visually, there was no difference in transparency for any film (data not shown).
 さらに、表1及び2に示される通り、「(B)/(A)」が本発明の範囲であると、透湿度が相対的に低く、水蒸気バリア性に優れた多層共押出フィルムが得られる。具体的には、(A)の値が同一である試験を比較すると(例えば、実施例1及び2ならびに比較例1及び2)、「(B)/(A)」が本発明の範囲であれば、フィルムの透湿度が低く、水蒸気バリア性に優れるフィルムが得られることがわかる。また、(A)の値が高いほど、フィルムの透湿度が低くなりやすく、水蒸気バリア性に優れた多層共押出フィルムを得やすい。 Furthermore, as shown in Tables 1 and 2, when “(B) / (A)” is within the scope of the present invention, a multilayer coextruded film having relatively low moisture permeability and excellent water vapor barrier properties can be obtained. . Specifically, when tests with the same value of (A) are compared (for example, Examples 1 and 2 and Comparative Examples 1 and 2), “(B) / (A)” is within the scope of the present invention. For example, it can be seen that a film having low moisture permeability and excellent water vapor barrier properties can be obtained. Moreover, the higher the value of (A), the lower the moisture permeability of the film, and the easier it is to obtain a multilayer coextruded film excellent in water vapor barrier properties.

Claims (6)

  1.  環状オレフィン系樹脂とポリエチレン系樹脂とを含有する中間層と、
     該中間層を挟み両外側に配置され、ポリエチレン系樹脂を含有する外層と、
    で構成される3層以上の多層共押出フィルムであって、
     前記多層共押出フィルム中における前記環状オレフィン系樹脂の含有量を(A)質量%とし、前記中間層における前記環状オレフィン系樹脂の含有量を(B)質量%とした際に、
     (A)に対する(B)の比である(B)/(A)が4以上8以下であることを特徴とする多層共押出フィルム。
    An intermediate layer containing a cyclic olefin resin and a polyethylene resin;
    An outer layer disposed on both outer sides of the intermediate layer and containing a polyethylene resin;
    A multilayer coextruded film of 3 or more layers, comprising:
    When the content of the cyclic olefin resin in the multilayer coextruded film is (A) mass% and the content of the cyclic olefin resin in the intermediate layer is (B) mass%,
    A multilayer coextruded film, wherein (B) / (A), which is the ratio of (B) to (A), is 4 or more and 8 or less.
  2.  前記(A)質量%が、5質量%以上20%未満である請求項1記載の多層共押出フィルム。 The multilayer coextruded film according to claim 1, wherein the (A) mass% is 5 mass% or more and less than 20%.
  3.  前記(B)質量%が、30質量%以上95質量%未満である請求項1又は2に記載の多層共押出フィルム。 The multilayer coextruded film according to claim 1 or 2, wherein the (B) mass% is 30 mass% or more and less than 95 mass%.
  4.  前記中間層のポリエチレン系樹脂が、直鎖状低密度ポリエチレン(LLDPE)と高圧法低密度ポリエチレン(LDPE)との混合物である請求項1から3のいずれかに記載の多層共押出フィルム。 The multilayer coextruded film according to any one of claims 1 to 3, wherein the polyethylene resin of the intermediate layer is a mixture of linear low density polyethylene (LLDPE) and high pressure method low density polyethylene (LDPE).
  5.  前記外層のポリエチレン系樹脂が、直鎖状低密度ポリエチレン(LLDPE)と高圧法低密度ポリエチレン(LDPE)との混合物である請求項1から4のいずれかに記載の多層共押出フィルム。 The multilayer coextruded film according to any one of claims 1 to 4, wherein the outer layer polyethylene resin is a mixture of linear low density polyethylene (LLDPE) and high pressure low density polyethylene (LDPE).
  6.  ブロー比1.5から4.0のインフレーション法によって成形された請求項1から5のいずれかに記載の多層共押出フィルム。 The multilayer coextruded film according to any one of claims 1 to 5, which is formed by an inflation method having a blow ratio of 1.5 to 4.0.
PCT/JP2014/062461 2013-07-12 2014-05-09 Coextruded multilayer film WO2015004980A1 (en)

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JP6855725B2 (en) * 2015-09-24 2021-04-07 日本ポリエチレン株式会社 Manufacturing method of straight easy-cut film and straight easy-cut film
JP2017170894A (en) * 2016-03-17 2017-09-28 日本ポリエチレン株式会社 Easily tearable multilayer film
JP6740728B2 (en) * 2016-06-10 2020-08-19 凸版印刷株式会社 Sealant film
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