WO2025105452A1 - 積層フィルム及び包装体 - Google Patents

積層フィルム及び包装体 Download PDF

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Publication number
WO2025105452A1
WO2025105452A1 PCT/JP2024/040555 JP2024040555W WO2025105452A1 WO 2025105452 A1 WO2025105452 A1 WO 2025105452A1 JP 2024040555 W JP2024040555 W JP 2024040555W WO 2025105452 A1 WO2025105452 A1 WO 2025105452A1
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Prior art keywords
resin layer
resin
density polyethylene
mass
polyolefin
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PCT/JP2024/040555
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English (en)
French (fr)
Japanese (ja)
Inventor
智大 中田
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Sumitomo Bakelite Co Ltd
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Sumitomo Bakelite Co Ltd
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Priority to JP2025540969A priority Critical patent/JP7782761B2/ja
Publication of WO2025105452A1 publication Critical patent/WO2025105452A1/ja
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

Definitions

  • the present invention relates to a laminate film and a packaging material.
  • Laminated films which are made up of multiple resin layers stacked together, are widely used as packaging materials.
  • a typical laminated film has at least a sealant layer that is provided for heat sealing to the object to be sealed, and an outer layer that is provided on the side opposite the sealant layer.
  • a laminate film for example, a polyethylene laminate for packaging materials has been disclosed which comprises at least a stretched polyethylene film, an adhesive layer, and a heat-sealable polyethylene layer, in which the adhesive layer contains a solventless adhesive (see Patent Document 1).
  • a package may be required to have a strength higher than usual.
  • a package that has excellent pinhole resistance, which suppresses the occurrence of pinholes in the package when the package is twisted, and puncture strength, which suppresses breakage of the package even if a sharp part of the stored item hits the package is useful when packaging an object while maintaining a high level of hygiene.
  • the pinhole resistance and puncture strength of a packaging material do not necessarily have to be compatible, and it is often the case that an increase in one results in a decrease in the other.
  • the laminated film described in Patent Document 1 does not provide both high pinhole resistance and puncture strength for the package.
  • the objective of the present invention is to provide a laminated film that can be used to produce packaging that is highly pinhole resistant and puncture resistant, and is highly suitable for recycling.
  • a laminated film comprising a first resin layer, a third resin layer and a second resin layer laminated in this order in a thickness direction, wherein the first resin layer, the second resin layer and the third resin layer contain the same type of polyolefin-based resin, the ratio of the thickness of the third resin layer to the thickness of the laminated film is more than 85%, and when the laminated film is subjected to a Gelbo flex test in accordance with ASTM F392 at a temperature of 23°C and 2000 twists, the number of pinholes observed in the laminated film after the Gelbo flex test is 2 or less, and the puncture strength of the laminated film is 6 N or more.
  • the first resin layer contains, as the polyolefin resin, one or more selected from the group consisting of low density polyethylene, linear low density polyethylene, metallocene-catalyzed linear low density polyethylene, and ethylene-vinyl acetate copolymer.
  • the first resin layer contains an ethylene-vinyl acetate copolymer and a homopolypropylene as the polyolefin resin.
  • the second resin layer contains, as the polyolefin resin, one or more selected from the group consisting of high-density polyethylene, low-density polyethylene, linear low-density polyethylene, and metallocene-catalyzed linear low-density polyethylene.
  • the present invention makes it possible to produce packaging that is highly resistant to pinholes and punctures, and provides a laminated film that is highly suitable for recycling.
  • FIG. 1 is a cross-sectional view illustrating an example of a laminated film according to an embodiment of the present invention.
  • FIG. 1 is a cross-sectional view showing a schematic example of a packaging body according to an embodiment of the present invention.
  • the laminate film is a laminate film constructed by laminating a first resin layer, a third resin layer, and a second resin layer in this order in the thickness direction, wherein the first resin layer, the second resin layer, and the third resin layer contain the same type of polyolefin-based resin, the ratio of the thickness of the third resin layer to the thickness of the laminate film is more than 85%, and when the laminate film is subjected to a Gelbo flex test in accordance with ASTM F392 at a temperature of 23°C and 2000 twists, the number of pinholes observed in the laminate film after the Gelbo flex test is 2 or less, and the puncture strength of the laminate film is 6 N or more.
  • the first resin layer, the second resin layer, and the third resin layer contain the same type of polyolefin resin, and therefore the laminate film is highly suitable for reuse.
  • the number of pinholes found in the laminate film is two or less, meaning that the laminate film has high pinhole resistance and can be used to produce packaging that is highly pinhole resistant.
  • the laminated film of this embodiment has a high puncture strength of 6 N or more, and the laminated film can be used to produce a package having high puncture strength.
  • the ratio of the thickness of the third resin layer to the thickness of the laminate film is more than 85% (85 ⁇ [thickness of third resin layer] / [thickness of laminate film] x 100), so that the puncture strength and pinhole resistance of the laminate film are high.
  • Resin films used to produce packaging bodies to date have not necessarily been able to achieve both high pinhole resistance and high puncture strength.
  • the laminated film of the present embodiment has the above-described configuration, and thus has high pinhole resistance and puncture strength, making it possible to produce a package having both high pinhole resistance and puncture strength.
  • the first resin layer does not have to be the outermost layer of the laminate film of the present embodiment, but it is preferable that it is the outermost layer, and the first resin layer that is the outermost layer is suitable as, for example, a sealant layer.
  • the second resin layer does not have to be the outermost layer of the laminate film of the present embodiment, but it is preferable that it is the outermost layer, and the second resin layer that is the outermost layer is suitable as, for example, an outer layer.
  • the third resin layer corresponds to an intermediate layer.
  • the laminate film of the present embodiment is subjected to a Gelbo flex test in accordance with ASTM F392 under conditions of a temperature of 23° C. and 2000 twists, the number of pinholes observed in the laminate film after the Gelbo flex test is 2 or less (0 to 2), preferably 0 to 1, and more preferably 0.
  • the laminated film exhibits the above-mentioned Gelbo flex test results and has high pinhole resistance. That is, even when a torsional force is applied to the laminated film, the occurrence of pinholes (breakage) is suppressed, and the laminated film has high torsional resistance.
  • the size of the film used in the Gelbo Flex test is preferably the A4 size standard (210 mm x 297 mm).
  • a film of this size may be referred to as the "first test piece.”
  • the pinhole resistance (twist resistance) of the laminate film of this embodiment can be adjusted, for example, by adjusting the type or content of the components of each layer, such as the first resin layer, the second resin layer, or the third resin layer, constituting the laminate film, or the thickness of each of these layers.
  • the pinhole resistance of the laminate film can be easily adjusted by adjusting the type or content of the components of the second resin layer and the third resin layer, or the thickness of the second resin layer and the third resin layer.
  • the pinhole resistance of the laminate film can be more easily adjusted by adjusting the type or content of the components of the second resin layer, or the thickness of the second resin layer.
  • the puncture strength of the laminate film of this embodiment is 6 N or more, preferably 8.5 N or more, and more preferably 10 N or more.
  • the higher the puncture strength of the laminate film the higher the strength of the laminate film.
  • the puncture strength of the laminate film is equal to or more than the lower limit, even if a sharp part is present in the stored object in a package obtained by packaging an object using the laminate film and such a part hits the package (more specifically, the area constituted by the laminate film of this embodiment), damage to the package is suppressed.
  • the upper limit of the puncture strength of the laminated film of the present embodiment is not particularly limited.
  • a laminated film having a puncture strength of 14 N or less can be more easily produced.
  • the piercing strength may be, for example, any one of 6 to 14 N, 8.5 to 14 N, and 10 to 14 N. However, these are just examples of the piercing strength.
  • the tip of a needle having a radius of curvature of 0.5 mm is pressed vertically into the laminate film from the second resin layer side at a speed of 50 mm/min, and the load applied to the needle at the moment the needle penetrates the laminate film is used as the puncture strength of the laminate film.
  • the needle may be, for example, a stainless steel needle.
  • the puncture strength of the laminated film of this embodiment can be adjusted, for example, by adjusting the type or content of the components of each layer, such as the first resin layer, the second resin layer, or the third resin layer, that constitutes the laminated film, or the thickness of each of these layers.
  • the puncture strength of the laminated film can be more easily adjusted by adjusting the type or content of the components of the third resin layer, or the thickness of the third resin layer.
  • the ratio of the thickness of the third resin layer to the thickness of the laminate film ([thickness of the third resin layer])/[thickness of the laminate film] ⁇ 100) is more than 85%, and in terms of enhancing the above-mentioned effects, the ratio is preferably 87% or more, and more preferably 89% or more.
  • the ratio of the thickness of the third resin layer to the thickness of the laminate film is preferably less than 100% and not more than 95%. When the ratio is in such a range, the effect obtained by providing the laminate film with the first resin layer and the second resin layer is further enhanced.
  • the ratio of the thickness of the third resin layer to the thickness of the laminate film may be, for example, any one of more than 85% and not more than 95%, 87 to 95%, and 89 to 95%, although these are just examples of the ratios.
  • the ratio of the thickness of the first resin layer to the thickness of the laminated film is preferably 7.5% or less, more preferably 6.5% or less, and even more preferably 5.5% or less.
  • the ratio of the thickness of the first resin layer to the thickness of the laminate film is preferably more than 0% and 1% or more.
  • the ratio is 1% or more, the effect obtained by the laminate film having the first resin layer is enhanced.
  • the first resin layer is a sealant layer, the seal strength of the package obtained by heat-sealing the laminate film or a molded body thereof with another resin film or a molded body thereof is increased.
  • the ratio of the thickness of the second resin layer to the thickness of the laminate film is preferably 7.5% or less, more preferably 6.5% or less, and even more preferably 5.5% or less.
  • the ratio of the thickness of the second resin layer to the thickness of the laminate film is preferably more than 0% and 1% or more. When the ratio is in such a range, the effect obtained by the laminate film having the second resin layer is higher.
  • the second resin layer is an outer layer
  • the pinhole resistance of the laminate film and the package obtained using the laminate film is higher.
  • the moldability of the laminate film is also improved.
  • the thickness at the corners is suppressed from becoming excessively thin, and the desired shape can be realized with high precision.
  • the heat resistance is also increased, and the heat resistance of the package obtained using the laminate film is also increased.
  • the sum of the ratio of the thickness of the first resin layer to the thickness of the laminate film, the ratio of the thickness of the second resin layer to the thickness of the laminate film, and the ratio of the thickness of the third resin layer to the thickness of the laminate film does not exceed 100%.
  • the ratio of [thickness of the first resin layer]:[thickness of the second resin layer] is preferably 7:3 to 3:7, and more preferably 6:4 to 4:6.
  • FIG. 1 is a cross-sectional view illustrating an example of the laminated film of the present embodiment.
  • the laminated film 1 shown here is composed of a first resin layer 11 and a second resin layer 12 provided on one surface 11a (sometimes referred to as the "first surface” in this specification) of the first resin layer 11.
  • the laminate film 1 further includes a third resin layer 13 between the first resin layer 11 and the second resin layer 12 . That is, the laminate film 1 is configured by laminating a first resin layer 11, a third resin layer 13, and a second resin layer 12 in this order in the thickness direction.
  • the first resin layer 11 is one of the outermost layers of the laminate film 1 .
  • the other surface 11b of the first resin layer 11 (the surface opposite to the second resin layer 12 side, sometimes referred to as the "second surface” in this specification) is an exposed surface (one of the outermost surfaces).
  • the second surface 11b of the first resin layer 11 is a sealing surface with another resin film or a molded body thereof.
  • the non-sealed area of the second surface 11b of the first resin layer 11 forms a storage section in the package.
  • the outermost layer means the outermost layer in the stacking direction of each layer constituting the laminated film
  • the outermost surface means the outermost surface (i.e., the exposed surface) in the stacking direction of each layer constituting the laminated film.
  • the second resin layer 12 is the other outermost layer of the laminate film 1 .
  • One surface 12a of the second resin layer 12 (the surface opposite to the first resin layer 11 side, sometimes referred to as the "first surface” in this specification) is an exposed surface (the outermost surface of the other side).
  • the first surface 12a of the second resin layer 12 is also an exposed surface (the outermost surface of the other side) in the package configured as described above.
  • the first resin layer 11, the second resin layer 12, and the third resin layer 13 contain the same type of polyolefin resin.
  • the ratio (T 13 /T 1 ⁇ 100) of the thickness T 13 of the third resin layer 13 to the thickness T 1 of the laminate film 1 is more than 85%.
  • the number of pinholes found in the laminate film 1 or the first test piece thereof after the Gelbo flex test is 2 or less.
  • the puncture strength of the laminated film 1 is 6N or more.
  • the first resin layer includes a polyolefin resin.
  • the polyolefin resin means a resin having a structural unit derived from an olefin, not limited to the first resin layer.
  • the ratio of the total content of one or more components contained in the first resin layer, which will be described later, to the total mass of the first resin layer does not exceed 100 mass %.
  • the ratio of the total content of one or more of the components contained in the composition for forming the first resin layer described below to the total mass of the composition for forming the first resin layer does not exceed 100 mass%.
  • the polyolefin resin contained in the first resin layer may be a homopolymer of one type of olefin, or a copolymer of two or more types of olefins.
  • polyethylene-based resins examples include polyethylene-based resins (in this specification, the polyethylene-based resin contained in the first resin layer may be particularly referred to as "polyethylene-based resin (e1)"), polypropylene-based resins (in this specification, the polypropylene-based resin contained in the first resin layer may be particularly referred to as "polypropylene-based resin (p1)"), etc.
  • the polyethylene-based resin (polyethylene-based resin (e1)) contained in the first resin layer is a polymer (resin component) having structural units derived from ethylene, and may be polyethylene (PE, for example, a homopolymer of ethylene) or an ethylene-based copolymer having structural units derived from ethylene and structural units derived from a monomer other than ethylene.
  • PE polyethylene
  • examples of the polyethylene (PE) include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), metallocene-catalyzed linear low density polyethylene (mLLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), etc., and low density polyethylene, linear low density polyethylene, or metallocene-catalyzed linear low density polyethylene is preferred.
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • mLLDPE metallocene-catalyzed linear low density polyethylene
  • MDPE medium density polyethylene
  • HDPE high density polyethylene
  • the densities of low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and metallocene-catalyzed linear low density polyethylene (mLLDPE) are 0.910 g/ cm3 or more and less than 0.945 g/ cm3 .
  • Medium density polyethylene (MDPE) has a density of 0.945 g/ cm3 or more and less than 0.955 g/ cm3 .
  • High density polyethylene (HDPE) has a density of 0.955 g/ cm3 or higher.
  • polyethylenes having structural units derived from octene such as linear low-density polyethylene having structural units derived from octene (C 8 H 16 ) (sometimes referred to as “C8-LLDPE” in this specification) and metallocene-catalyzed linear low-density polyethylene having structural units derived from octene (C 8 H 16 ) (sometimes referred to as “C8-mLLDPE” in this specification).
  • C8-LLDPE is a subordinate concept of LLDPE (linear low density polyethylene), and linear low density polyethylene is a concept that encompasses linear low density polyethylene having a structural unit derived from octene and other linear low density polyethylenes.
  • C8-mLLDPE is a subordinate concept of mLLDPE (metallocene-catalyzed linear low density polyethylene), and metallocene-catalyzed linear low density polyethylene is a concept that encompasses metallocene-catalyzed linear low density polyethylene having a structural unit derived from octene and other metallocene-catalyzed linear low density polyethylenes.
  • the ethylene-based copolymer contained in the first resin layer is preferably a resin other than an ethylene-vinyl alcohol copolymer (EVOH).
  • ethylene-based copolymer contained in the first resin layer include ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl alcohol-vinyl acetate copolymer (also known as ethylene-vinyl acetate copolymer partially saponified product, sometimes referred to as "EVA partially saponified product” in this specification), ethylene-vinyl alcohol copolymer (EVOH, also known as ethylene-vinyl acetate copolymer saponified product, sometimes referred to as "EVA saponified product” in this specification), ethylene-methyl acrylate copolymer (EMA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic
  • the ionomer may be, for example, a resin in which a copolymer of ethylene and a small amount of acrylic acid or methacrylic acid has an ionic crosslinking structure due to salt formation between the acid portion in the copolymer and a metal ion.
  • the polypropylene-based resin (polypropylene-based resin (p1)) contained in the first resin layer is a polymer (resin component) having structural units derived from propylene, and may be a homopolymer of propylene (homopolypropylene, hPP) or a propylene-based copolymer having structural units derived from propylene and structural units derived from a monomer other than propylene.
  • propylene-based copolymer contained in the first resin layer examples include propylene-ethylene random copolymer (also known as polypropylene random copolymer (rPP)), propylene-ethylene block copolymer (also known as polypropylene block copolymer (bPP)), etc.
  • the first resin layer may contain only one type of polyolefin resin, or two or more types. When the first resin layer contains two or more types, the combination and ratio of the resins can be selected as desired depending on the purpose.
  • the melting point of the polyolefin resin contained in the first resin layer is preferably 75 to 130°C, more preferably 80 to 128°C, and even more preferably 85 to 126°C.
  • the melting point of the polyolefin resin is in this range, the characteristics of the first resin layer are improved.
  • the melting point of the polyolefin resin is equal to or higher than the lower limit, and the seal strength of the laminated film to the object of the heat seal is increased within an appropriate range.
  • the melting point of the polyolefin resin is equal to or lower than the upper limit, the effect of suppressing melting of the object of the heat seal when the laminated film is heat sealed is increased.
  • melting point refers to a value measured in accordance with JIS K 7121.
  • the melt flow rate (sometimes referred to as "MFR" in this specification) of the polyolefin resin contained in the first resin layer is preferably 2 to 20 g/10 min, more preferably 2.5 to 16 g/10 min, and even more preferably 3 to 14 g/10 min.
  • MFR melt flow rate
  • the MFR of the polyolefin resin is in this range, the characteristics of the first resin layer are improved.
  • the MFR of the polyolefin resin is equal to or greater than the lower limit, the variation in thickness of the first resin layer is highly suppressed.
  • the MFR of the polyolefin resin is equal to or less than the upper limit, adhesion of foreign matter originating from the laminate film to the hot plate used for molding is suppressed during heat molding of the laminate film, and contamination of the molding equipment is highly suppressed.
  • MFR refers to a value measured in accordance with JIS K 6922-1.
  • the first resin layer may or may not contain other components not corresponding to the polyolefin resins as long as the effects of the present invention are not impaired.
  • the other components contained in the first resin layer may be either resin components (sometimes referred to in this specification as “other resin components") or non-resin components (sometimes referred to in this specification as “other non-resin components").
  • the other resin components contained in the first resin layer are not particularly limited, so long as they are resins other than the polyolefin-based resin.
  • Examples of the other non-resin components contained in the first resin layer include additives known in the art.
  • Examples of the additives include antifogging agents, antiblocking agents, antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, viscosity reducers, thickeners, heat stabilizers, lubricants, infrared absorbers, and ultraviolet absorbers.
  • the first resin layer may contain only one type of other component, or two or more types. When there are two or more types, the combination and ratio of these components can be selected as desired depending on the purpose.
  • the first resin layer contains the same type of polyolefin-based resin as the polyolefin-based resin contained in the second resin layer and the third resin layer described below.
  • the term "same type of resin” refers to resins having common structural units, and is not limited to polyolefin resins. In both resins, the ratio of the amount (mol) of the common structural units to the total amount (mol) of the structural units is 20 mol% or more when comparing resins having common structural units.
  • low density polyethylene LDPE
  • linear low density polyethylene LLDPE
  • metallocene-catalyzed linear low density polyethylene mLLDPE
  • medium density polyethylene MDPE
  • high density polyethylene HDPE
  • EMA resin ethylene-methyl acrylate copolymer
  • EMMA resin ethylene-methyl methacrylate copolymer
  • EVOH ethylene-vinyl alcohol copolymer
  • saponified EVA ethylene-vinyl acetate copolymer
  • EVA ethylene-vinyl alcohol-vinyl acetate copolymer
  • the ratio of the amount (mol) of the common structural units to the total amount (mol) of the structural units in both resins of the same type is preferably 30 mol% or more, more preferably 40 mol% or more, and even more preferably 50 mol% or more, and may be, for example, 60 mol% or more, 70 mol% or more, or 80 mol% or more. On the other hand, the ratio is less than 100 mol%.
  • the first resin layer may contain only one type of polyolefin resin of the same type, or two or more types. When there are two or more types, the combination and ratio of the resins can be selected as desired depending on the purpose.
  • the ratio of the content of the polyolefin-based resin to the total mass of the first resin layer is preferably 90 to 100% by mass, more preferably 95 to 100% by mass, and may be, for example, any one of 97 to 100% by mass and 99 to 100% by mass.
  • the ratio is equal to or greater than the lower limit, the effect obtained by the first resin layer containing a polyolefin-based resin is further enhanced.
  • the above ratio is usually the same as the ratio of the polyolefin-based resin content to the total content (parts by mass) of components that do not vaporize at room temperature in the composition for forming the first resin layer described below ([content (parts by mass) of polyolefin-based resin in the composition for forming the first resin layer] / [total content (parts by mass) of components that do not vaporize at room temperature in the composition for forming the first resin layer] ⁇ 100).
  • the content of polyolefin-based resin in the first resin layer means the total content of the same type of polyolefin-based resin as the polyolefin-based resin contained in the second resin layer and the third resin layer, and the other polyolefin-based resin.
  • room temperature means a temperature that is neither particularly cold nor hot, i.e., a normal temperature, such as a temperature between 15 and 25°C.
  • the ratio of the total content of the polyethylene resin (e1) and the polypropylene resin (p1) to the content of the polyolefin resin (([content of the polyethylene resin (e1) in the first resin layer (parts by mass)] + [content of the polypropylene resin (p1) in the first resin layer (parts by mass)]) / [content of the polyolefin resin in the first resin layer (parts by mass)] ⁇ 100) is preferably 80% by mass or more, more preferably 90% by mass or more, and may be, for example, any of 95% by mass or more, 97% by mass or more, and 99% by mass or more.
  • the ratio is equal to or more than the lower limit, the effect obtained by the first resin layer containing the polyethylene resin (e1) or the polypropylene resin (p1) is further enhanced.
  • a first resin layer is suitable as a sealant layer, and in that case, the sealing properties are improved in a package obtained by heat-sealing the laminate film or a molded body thereof with another resin film or a molded body thereof.
  • the ratio is 100% by mass or less.
  • the ratio is usually the same as the ratio of the total content (parts by mass) of the polyethylene-based resin (e1) and the polypropylene-based resin (p1) to the content (parts by mass) of the polyolefin-based resin in the composition for forming the first resin layer described below (([content (parts by mass) of the polyethylene-based resin (e1) in the composition for forming the first resin layer] + [content (parts by mass) of the polypropylene-based resin (p1) in the composition for forming the first resin layer]) / [content (parts by mass) of the polyolefin-based resin in the composition for forming the first resin layer] ⁇ 100).
  • the content of the polyethylene resin (e1) in the first resin layer or the composition for forming the first resin layer is 0 parts by mass.
  • the content of the polypropylene resin (p1) in the first resin layer or the composition for forming the first resin layer is 0 parts by mass.
  • the ratio of the content of the same type of polyolefin-based resin as the polyolefin-based resin contained in the second resin layer and the third resin layer to the total mass of the first resin layer is preferably 80 to 100 mass%, more preferably 90 to 100 mass%, and may be, for example, any one of 95 to 100 mass% and 99 to 100 mass%.
  • the ratio is equal to or more than the lower limit, the recyclability of the laminated film is increased.
  • the above ratio is usually the same as the ratio of the content (parts by mass) of the same type of polyolefin-based resin as the polyolefin-based resin contained in the second resin layer and the third resin layer to the total content (parts by mass) of components that do not vaporize at room temperature in the composition for forming the first resin layer described below ([content (parts by mass) of the same type of polyolefin-based resin as the polyolefin-based resin contained in the second resin layer and the third resin layer in the composition for forming the first resin layer] / [total content (parts by mass) of components that do not vaporize at room temperature in the composition for forming the first resin layer] ⁇ 100).
  • this sealant layer may be a non-easy peel type sealant layer (completely sealed type sealant layer) or an easy peel type sealant layer (easy peel layer).
  • the first resin layer which is the non-easy peel type sealant layer, is preferably a non-easy peel type sealant layer containing, as the polyolefin resin, one or more selected from the group consisting of polyethylene and ethylene copolymers (i.e., polyethylene resin (e1)).
  • the first resin layer which is a non-easy peel type sealant layer, preferably contains one or more polyolefin resins selected from the group consisting of low density polyethylene, linear low density polyethylene, metallocene-catalyzed linear low density polyethylene, and ethylene-vinyl acetate copolymer.
  • the linear low density polyethylene (LLDPE) contained in the first resin layer which is a non-easy peel type sealant layer is preferably a linear low density polyethylene having a structural unit derived from octene (C8-LLDPE).
  • the metallocene-catalyzed linear low-density polyethylene (mLLDPE) contained in the first resin layer which is a non-easy peel type sealant layer is preferably a metallocene-catalyzed linear low-density polyethylene having a constitutional unit derived from octene (C8-mLLDPE).
  • the first resin layer which is a non-easy peel type sealant layer, contains, as the polyolefin resin, one or more types selected from the group consisting of low density polyethylene, linear low density polyethylene having a structural unit derived from octene, metallocene-catalyzed linear low density polyethylene having a structural unit derived from octene, and ethylene-vinyl acetate copolymer.
  • the ratio of the content of the polyethylene resin (e1) to the content of the polyolefin resin in the first resin layer is preferably 80% by mass or more, more preferably 90% by mass or more, and may be, for example, any one of 95% by mass or more, 97% by mass or more, and 99% by mass or more.
  • the ratio is equal to or more than the lower limit, the first resin layer becomes a more excellent layer as a non-easy peel type sealant layer.
  • the ratio is 100% by mass or less.
  • the ratio is usually the same as the ratio of the content of polyethylene-based resin (e1) to the content (parts by mass) of polyolefin-based resin in the composition for forming the first resin layer described below ([content (parts by mass) of polyethylene-based resin (e1) in the composition for forming the first resin layer] / [content (parts by mass) of polyolefin-based resin in the composition for forming the first resin layer] ⁇ 100).
  • the first resin layer which is a non-easy peel type sealant layer, contains, as the polyolefin-based resin, one or more selected from the group consisting of low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, and ethylene-vinyl acetate copolymer, the ratio of the total content of low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, and ethylene-vinyl acetate copolymer to the content of polyolefin-based resin in the first resin layer (([Low Density of First Resin Layer [polyethylene content (parts by mass)] + [linear low density polyethylene content (parts by mass) of the first resin layer] + [metallocene-catalyzed linear low density polyethylene content (parts by mass) of the first resin layer] + [ethylene-vinyl acetate cop
  • the first resin layer becomes a more excellent layer as a non-easy peel type sealant layer.
  • the ratio is 100% by mass or less.
  • the ratio is usually the same as the ratio of the total content of low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, and ethylene-vinyl acetate copolymer to the content (parts by mass) of the polyolefin resin in the first resin layer-forming composition described below (([content of low-density polyethylene in the first resin layer-forming composition (parts by mass)] + [content of linear low-density polyethylene in the first resin layer-forming composition (parts by mass)]) + [content of metallocene-catalyzed linear low-density polyethylene in the first resin layer-forming composition (parts by mass)]) + [content of ethylene-vinyl acetate copolymer in the first resin layer
  • the first resin layer or the composition for forming the first resin layer does not contain any component selected from the group consisting of low density polyethylene, linear low density polyethylene, metallocene-catalyzed linear low density polyethylene, and ethylene-vinyl acetate copolymer
  • the content of that component in the first resin layer or the composition for forming the first resin layer is 0 parts by mass.
  • the first resin layer which is a non-easy peel type sealant layer, may or may not contain other components that are not included in the polyolefin resins, as described above, to the extent that the effects of the present invention are not impaired.
  • the first resin layer is an easy-peel layer
  • the first resin layer contains two incompatible polyolefin resins.
  • Such a first resin layer is suitable as an easy-peel layer that exhibits peelability due to cohesive failure.
  • the first resin layer which is an easy-peel layer, is preferably an easy-peel layer that contains, as two incompatible polyolefin resins, one or more selected from the group consisting of polyethylene and ethylene-based copolymers (i.e., polyethylene-based resin (e1)) and one or more selected from the group consisting of homopolypropylene and propylene-based copolymers (i.e., polypropylene-based resin (p1)).
  • polyethylene and ethylene-based copolymers i.e., polyethylene-based resin (e1)
  • p1 polypropylene-based resin
  • the ratio of the content of the polyethylene resin (e1) to the total content of the polyethylene resin (e1) and the polypropylene resin (p1) ([content of the polyethylene resin (e1) in the first resin layer (parts by mass)]/([content of the polyethylene resin (e1) in the first resin layer (parts by mass)]+[content of the polypropylene resin (p1) in the first resin layer (parts by mass)]) ⁇ 100) is preferably 60 to 90% by mass, and may be, for example, any of 70 to 90% by mass and 80 to 90% by mass, 60 to 80% by mass and 60 to 70% by mass, or 70 to 80% by mass.
  • the ratio of the total content of the polyethylene resin (e1) and the polypropylene resin (p1) to the content of the polyolefin resin in the first resin layer (([content of the polyethylene resin (e1) in the first resin layer (parts by mass)] + [content of the polypropylene resin (p1) in the first resin layer (parts by mass)]) / [content of the polyolefin resin in the first resin layer (parts by mass)] ⁇ 100) is the same as the ratio of the total content of the polyethylene resin (e1) and the polypropylene resin (p1) to the content of the polyolefin resin in the first resin layer, as described above.
  • the ratio is equal to or greater than the lower limit, the first resin layer becomes a more excellent layer as an easy peel layer. And, even when the first resin layer is an easy peel layer, the ratio is
  • the first resin layer which is an easy-peel layer, preferably contains ethylene-vinyl acetate copolymer and homopolypropylene as the polyolefin-based resin.
  • the ratio of the content of the ethylene-vinyl acetate copolymer to the total content of the ethylene-vinyl acetate copolymer and the homopolypropylene is preferably 60 to 90% by mass, and may be, for example, any of 70 to 90% by mass and 80 to 90% by mass, or any of 60 to 80% by mass and 60 to 70% by mass, or 70 to 80% by mass.
  • the ratio of the total content of the ethylene-vinyl acetate copolymer and the homopolypropylene to the content of the polyolefin resin (([the content of the ethylene-vinyl acetate copolymer in the first resin layer (parts by mass)] + [the content of the homopolypropylene in the first resin layer (parts by mass)]) / [the content of the polyolefin resin in the first resin layer (parts by mass)] ⁇ 100) is preferably 80% by mass or more, more preferably 90% by mass or more, and may be, for example, any one of 95% by mass or more, 97% by mass or more, and 99% by mass or more.
  • the ratio is equal to or more than the lower limit, the first resin layer becomes a more excellent layer as an easy peel layer.
  • the ratio is 100% by mass or less.
  • the ratio is usually the same as the ratio of the total content of ethylene-vinyl acetate copolymer and homopolypropylene to the content (parts by mass) of polyolefin-based resin in the composition for forming the first resin layer described below (([content (parts by mass) of ethylene-vinyl acetate copolymer in the composition for forming the first resin layer] + [content (parts by mass) of homopolypropylene in the composition for forming the first resin layer]) / [content (parts by mass) of polyolefin-based resin in the composition for forming the first resin layer] ⁇ 100).
  • the first resin layer which is the easy-peel layer, may or may not contain other components that do not fall under the category of polyolefin-based resins, as explained above, to the extent that the effects of the present invention are not impaired.
  • the first resin layer may be composed of one layer (single layer) or may be composed of two or more layers.
  • the first resin layer may be composed of multiple layers, these multiple layers may be the same or different from each other, and the combination of these multiple layers is not particularly limited as long as it does not impair the effects of the present invention.
  • the first resin layer preferably consists of one layer (single layer).
  • multiple layers may be the same or different
  • all layers may be the same, all layers may be different, or only some layers may be the same
  • multiple layers are different means "at least one of the constituent materials and thicknesses of each layer is different from each other.”
  • the thickness of the first resin layer can be set arbitrarily depending on the use of the laminate film and the thickness of the laminate film, and is not particularly limited.
  • the thickness of the first resin layer is preferably 20 ⁇ m or less, and may be, for example, 15 ⁇ m or less or 10 ⁇ m or less. By having the thickness of the first resin layer be equal to or less than the upper limit, the thickness of the laminated film can be made thinner.
  • the thickness of the first resin layer is particularly suitable to be equal to or less than the upper limit, and in that case, the effect obtained by the laminated film having the second resin layer and the third resin layer is enhanced.
  • the thickness of the first resin layer is preferably 1 ⁇ m or more, and may be, for example, 1.5 ⁇ m or more or 2 ⁇ m or more.
  • the thickness of the first resin layer is equal to or more than the lower limit, the effect obtained by the laminated film having the first resin layer is enhanced.
  • the sealing strength of the package obtained by heat-sealing the laminated film or its molded body with another resin film or its molded body is increased.
  • the first resin layer is made up of a plurality of layers, the total thickness of these layers is preferably within the above-mentioned numerical range.
  • the thickness of the first resin layer shown here is particularly suitable when the thickness of the laminated film is 60 to 250 ⁇ m, as described below.
  • the first resin layer is preferably a non-stretched layer (film).
  • the formability of the laminated film is improved.
  • the second resin layer contains the same type of polyolefin-based resin as the first resin layer and the third resin layer described below.
  • the ratio of the total content of one or more components contained in the second resin layer, which will be described later, to the total mass of the second resin layer does not exceed 100 mass %.
  • the ratio of the total content of one or more of the components contained in the composition for forming the second resin layer described below to the total mass of the composition for forming the second resin layer does not exceed 100 mass%.
  • the polyolefin-based resin contained in the second resin layer may be the same as the polyolefin-based resin contained in the first resin layer described above.
  • the polyolefin resin contained in the second resin layer may be a homopolymer of one type of olefin, or a copolymer of two or more types of olefins.
  • examples of the polyolefin-based resin contained in the second resin layer include a polyethylene-based resin (in this specification, the polyethylene-based resin contained in the second resin layer may be particularly referred to as a "polyethylene-based resin (e2)"), a polypropylene-based resin (in this specification, the polypropylene-based resin contained in the second resin layer may be particularly referred to as a "polypropylene-based resin (p2)”), and the like.
  • the polyethylene-based resin contained in the second resin layer is similar to the polyethylene-based resin contained in the first resin layer (polyethylene-based resin (e1)), and may be polyethylene (PE, for example, a homopolymer of ethylene) or an ethylene-based copolymer having a structural unit derived from ethylene and a structural unit derived from a monomer other than ethylene.
  • the polyethylene (PE) and the ethylene-based copolymer contained in the second resin layer may be the same as the polyethylene (PE) and the ethylene-based copolymer contained in the first resin layer.
  • the polypropylene-based resin (polypropylene-based resin (p2)) contained in the second resin layer is the same as the polypropylene-based resin (polypropylene-based resin (p1)) contained in the first resin layer, and may be a homopolymer of propylene (homopolypropylene, hPP) or a propylene-based copolymer having a structural unit derived from propylene and a structural unit derived from a monomer other than propylene.
  • the propylene-based copolymer contained in the second resin layer may be the same as the propylene-based copolymer contained in the first resin layer.
  • the second resin layer may contain only one type of polyolefin resin, or two or more types. When the second resin layer contains two or more types, the combination and ratio of the resins can be selected as desired depending on the purpose.
  • the second resin layer may or may not contain other components not corresponding to the polyolefin resin as long as the effect of the present invention is not impaired.
  • the other components may be either resin components (sometimes referred to as “other resin components” in this specification) or non-resin components (sometimes referred to as “other non-resin components” in this specification).
  • the other resin components and other non-resin components contained in the second resin layer may be the same as the other resin components and other non-resin components contained in the first resin layer.
  • the second resin layer may contain only one type of other component, or two or more types. When there are two or more types, the combination and ratio of these components can be selected as desired depending on the purpose.
  • the second resin layer may contain only one type of polyolefin resin of the same type, or two or more types. When there are two or more types, the combination and ratio of the resins can be selected as desired according to the purpose.
  • the content ratio of the polyolefin resin to the total mass of the second resin layer is preferably 90 to 100 mass%, more preferably 95 to 100 mass%, and may be, for example, any one of 97 to 100 mass% and 99 to 100 mass%.
  • the content is equal to or more than the lower limit, the effect obtained by the second resin layer containing the polyolefin resin is further enhanced.
  • the above ratio is usually the same as the ratio of the content of the polyolefin resin to the total content (parts by mass) of components that do not vaporize at room temperature in the composition for forming the second resin layer described below.
  • the content of polyolefin-based resin in the second resin layer means the total content of the same type of polyolefin-based resin as the polyolefin-based resin contained in the first resin layer and the third resin layer, and the other polyolefin-based resin.
  • the polyolefin resin contained in the second resin layer is preferably a polyethylene resin (e2) (either one or both of polyethylene and ethylene copolymer).
  • the ratio of the content of the polyethylene resin (e2) to the content of the polyolefin resin is preferably 80% by mass or more, more preferably 90% by mass or more, and may be, for example, any of 95% by mass or more, 97% by mass or more, and 99% by mass or more.
  • the ratio is equal to or more than the lower limit, the effect obtained by the second resin layer containing the polyethylene resin (e2) is further enhanced.
  • the pinhole resistance of such a second resin layer and the laminated film provided with the second resin layer is further enhanced.
  • the pinhole resistance of the package obtained using such a laminated film is also further enhanced.
  • the ratio is 100% by mass or less.
  • the ratio is usually the same as the ratio of the content (parts by mass) of the polyethylene resin (e2) to the content (parts by mass) of the polyolefin resin in the composition for forming the second resin layer described below.
  • the content ratio of the polyolefin resin of the same type as the polyolefin resin contained in the first resin layer and the third resin layer to the total mass of the second resin layer is preferably 80 to 100 mass%, more preferably 90 to 100 mass%, and may be, for example, any one of 95 to 100 mass% and 99 to 100 mass%.
  • the content is equal to or more than the lower limit, the recyclability of the laminated film is further increased.
  • the above ratio is usually the same as the ratio of the content (parts by mass) of the same type of polyolefin-based resin as the polyolefin-based resin contained in the first resin layer and the third resin layer to the total content (parts by mass) of components that do not vaporize at room temperature in the composition for forming the second resin layer described below.
  • the polyolefin resin contained in the second resin layer is preferably polyethylene.
  • a more preferred example of the second resin layer includes a second resin layer containing, as the polyolefin resin, one or more selected from the group consisting of high-density polyethylene and low-density polyethylene, linear low-density polyethylene, and metallocene-catalyzed linear low-density polyethylene.
  • the second resin layer containing the polyethylene classified into the two groups is particularly suitable as an outer layer. Since the second resin layer contains high density polyethylene, its heat resistance is higher, and the heat resistance of the laminated film and the package including the second resin layer is also higher.
  • the second resin layer contains one or more selected from the group consisting of low density polyethylene, linear low density polyethylene, and metallocene-catalyzed linear low density polyethylene, its pinhole resistance and moldability are higher. And, the pinhole resistance and moldability of the laminated film and the package including the second resin layer are also higher.
  • the linear low density polyethylene contained in the second resin layer is preferably a linear low density polyethylene having structural units derived from octene (C8-LLDPE), and the metallocene-catalyzed linear low density polyethylene is preferably a metallocene-catalyzed linear low density polyethylene having structural units derived from octene (C8-mLLDPE).
  • the second resin layer is a second resin layer containing, as the polyolefin resin, one or more types selected from the group consisting of high-density polyethylene, low-density polyethylene, linear low-density polyethylene having a structural unit derived from octene, and metallocene-catalyzed linear low-density polyethylene having a structural unit derived from octene.
  • the second resin layer contains, as the polyolefin resin, one or more selected from the group consisting of high-density polyethylene, low-density polyethylene, linear low-density polyethylene, and metallocene-catalyzed linear low-density polyethylene, the ratio of the total content of the high-density polyethylene, low-density polyethylene, linear low-density polyethylene, and metallocene-catalyzed linear low-density polyethylene to the content of the polyolefin resin in the second resin layer (([content of high-density polyethylene in the second resin layer (parts by mass)] + [content of low-density polyethylene in the second resin layer (parts by mass)] + [content of linear low-density polyethylene in the second resin layer (parts by mass)] + [content of metallocene-catalyzed linear low-density polyethylene in the second resin layer (parts by mass)]) / [content of polyolefin
  • the ratio is equal to or greater than the lower limit, the heat resistance, pinhole resistance, and moldability of the second resin layer and the laminate film including the second resin layer are improved, and the heat resistance and pinhole resistance of a package obtained using the laminate film are also improved, and a desired shape can be realized with high precision.
  • the ratio is 100% by mass or less.
  • the ratio is usually the same as the ratio of the total content of high density polyethylene, low density polyethylene, linear low density polyethylene, and metallocene-catalyzed linear low density polyethylene to the content of polyolefin resin in the composition for forming the second resin layer described later (([content of high density polyethylene in the composition for forming the second resin layer (parts by mass)] + [content of low density polyethylene in the composition for forming the second resin layer (parts by mass)] + [content of linear low density polyethylene in the composition for forming the second resin layer (parts by mass)] + [content of metallocene-catalyzed linear low density polyethylene in the composition for forming the second resin layer (parts by mass)]) / [content of polyolefin resin in the composition for forming the second resin layer (parts by mass)] ⁇ 100).
  • the second resin layer or the composition for forming the second resin layer does not contain any component selected from the group consisting of low density polyethylene, linear low density polyethylene, and metallocene-catalyzed linear low density polyethylene
  • the content of that component in the second resin layer or the composition for forming the second resin layer is 0 parts by mass.
  • the second resin layer contains, as the polyolefin resin, one or more selected from the group consisting of high-density polyethylene, low-density polyethylene, linear low-density polyethylene, and metallocene-catalyzed linear low-density polyethylene, the ratio of the content of high-density polyethylene to the total content of high-density polyethylene, low-density polyethylene, linear low-density polyethylene, and metallocene-catalyzed linear low-density polyethylene in the second resin layer ([content of high-density polyethylene in the second resin layer (parts by mass)] / ([content of high-density polyethylene in the second resin layer (parts by mass)] + [content of low-density polyethylene in the second resin layer (parts by mass)] + [content of linear low-density polyethylene in the second resin layer (parts by mass)] + [content of metallocene-catalyzed linear low-density polyethylene
  • the ratio is equal to or greater than the lower limit, the effect of the second resin layer containing high-density polyethylene is enhanced, i.e., the heat resistance of the second resin layer, the laminate film, and the packaging body is improved.
  • the ratio is preferably 90% by mass or less, more preferably 80% by mass or less, and even more preferably 70% by mass or less.
  • the ratio is equal to or less than the upper limit, the effect obtained by the second resin layer containing low density polyethylene, linear low density polyethylene, or metallocene-catalyzed linear low density polyethylene is enhanced. That is, the pinhole resistance and moldability of the second resin layer and the laminated film are enhanced.
  • the ratio is usually the same as the ratio of the content of high density polyethylene to the total content of high density polyethylene, low density polyethylene, linear low density polyethylene, and metallocene-catalyzed linear low density polyethylene in the composition for forming the second resin layer described later ([content of high density polyethylene in the composition for forming the second resin layer (parts by mass)] / ([content of high density polyethylene in the composition for forming the second resin layer (parts by mass)] + [content of low density polyethylene in the composition for forming the second resin layer (parts by mass)] + [content of linear low density polyethylene in the composition for forming the second resin layer (parts by mass)] + [content of metallocene-catalyzed linear low density polyethylene in the composition for forming the second resin layer (parts by mass)]) ⁇ 100).
  • the second resin layer or the composition for forming the second resin layer does not contain any component selected from the group consisting of low density polyethylene, linear low density polyethylene, and metallocene-catalyzed linear low density polyethylene
  • the content of that component in the second resin layer or the composition for forming the second resin layer is 0 parts by mass.
  • the second resin layer contains, as the polyolefin resin, either one or both of a linear low density polyethylene and a metallocene-catalyzed linear low density polyethylene
  • the second resin layer is preferably formed of a linear low density polyethylene having a structural unit derived from octene (C8-LLDPE) and a metallocene-catalyzed linear low density polyethylene having a structural unit derived from octene (C9-LLDPE) relative to the total content of the linear low density polyethylene and the metallocene-catalyzed linear low density polyethylene.
  • the ratio of the total content of the second resin layer (([C8-LLDPE content (parts by mass) of the second resin layer] + [C8-mLLDPE content (parts by mass) of the second resin layer]) / ([LLDPE content (parts by mass) of the second resin layer] + [mLLDPE content (parts by mass) of the second resin layer]) ⁇ 100) is preferably 80% by mass or more, more preferably 90% by mass or more, and may be, for example, any of 95% by mass or more, 97% by mass or more, and 99% by mass or more. When the ratio is equal to or more than the lower limit, the heat resistance, pinhole resistance, and moldability of the laminate film having such a second resin layer are further improved.
  • the ratio is 100% by mass or less.
  • the ratio is usually the ratio of the total content of the linear low density polyethylene (C8-LLDPE) having a structural unit derived from octene and the metallocene-catalyzed linear low density polyethylene (C8-mLLDPE) having a structural unit derived from octene to the total content of the linear low density polyethylene and the metallocene-catalyzed linear low density polyethylene in the second resin layer forming composition described later (([C8-LLDPE content (parts by mass) of the second resin layer forming composition] + [C8-mLLDPE content (parts by mass) of the second resin layer forming composition]) / ([LLDPE content (parts by mass) of the second resin layer forming composition] + [mLLDPE content (parts by mass) of the second resin
  • the second resin layer or the composition for forming the second resin layer does not contain any component selected from the group consisting of linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, linear low-density polyethylene having a structural unit derived from octene, and metallocene-catalyzed linear low-density polyethylene having a structural unit derived from octene
  • the content of that component in the second resin layer or the composition for forming the second resin layer is 0 parts by mass.
  • the second resin layer may be one layer (single layer) or two or more layers.
  • the second resin layer is made of multiple layers, these multiple layers may be the same or different from each other, and the combination of these multiple layers is not particularly limited as long as it does not impair the effects of the present invention.
  • the second resin layer preferably consists of one layer (single layer).
  • the thickness of the second resin layer is not particularly limited and can be set arbitrarily depending on the application of the laminate film and the thickness of the laminate film.
  • the thickness of the second resin layer is preferably 20 ⁇ m or less, and may be, for example, 15 ⁇ m or less or 10 ⁇ m or less. By having the thickness of the second resin layer be equal to or less than the upper limit, the thickness of the laminated film can be made thinner.
  • the thickness of the first resin layer is within the above-mentioned numerical range and the thickness of the third resin layer is within the numerical range described below, the thickness of the second resin layer is particularly suitable to be equal to or less than the upper limit, and in that case, the effect obtained by the laminated film having the first resin layer and the third resin layer is enhanced.
  • the thickness of the second resin layer is preferably 1 ⁇ m or more, and may be, for example, 1.5 ⁇ m or more or 2 ⁇ m or more.
  • the thickness of the second resin layer is equal to or more than the lower limit, the effect obtained by the laminate film having the second resin layer is enhanced.
  • the pinhole resistance of the laminate film is enhanced.
  • the second resin layer is made up of a plurality of layers, the total thickness of these layers is preferably within the above numerical range.
  • the thickness of the second resin layer shown here is particularly suitable when the thickness of the laminated film is 60 to 250 ⁇ m, as described below.
  • the second resin layer is preferably a non-stretched layer (film).
  • the second resin layer be a non-stretched layer, the formability of the laminated film is improved.
  • the third resin layer contains the same type of polyolefin-based resin as the polyolefin-based resin contained in the first resin layer and the second resin layer.
  • the ratio of the total content of one or more components contained in the third resin layer, which will be described later, to the total mass of the third resin layer does not exceed 100 mass %.
  • the ratio of the total content of one or more of the components contained in the composition for forming the third resin layer described below to the total mass of the composition for forming the third resin layer does not exceed 100 mass%.
  • the polyolefin-based resin contained in the third resin layer may be the same as the polyolefin-based resin contained in the first resin layer described above.
  • the polyolefin resin contained in the third resin layer may be a homopolymer of one type of olefin, or a copolymer of two or more types of olefins.
  • examples of the polyolefin-based resin contained in the third resin layer include a polyethylene-based resin (in this specification, the polyethylene-based resin contained in the third resin layer may be particularly referred to as a "polyethylene-based resin (e3)"), a polypropylene-based resin (in this specification, the polypropylene-based resin contained in the third resin layer may be particularly referred to as a "polypropylene-based resin (p3)”), and the like.
  • the polyethylene-based resin contained in the third resin layer is similar to the polyethylene-based resin contained in the first resin layer (polyethylene-based resin (e1)), and may be polyethylene (PE, for example, a homopolymer of ethylene) or an ethylene-based copolymer having a structural unit derived from ethylene and a structural unit derived from a monomer other than ethylene.
  • the polyethylene (PE) and the ethylene-based copolymer contained in the third resin layer may be the same as the polyethylene (PE) and the ethylene-based copolymer contained in the first resin layer.
  • the polypropylene-based resin contained in the third resin layer is the same as the polypropylene-based resin contained in the first resin layer (polypropylene-based resin (p1)), and may be a homopolymer of propylene (homopolypropylene, hPP) or a propylene-based copolymer having a structural unit derived from propylene and a structural unit derived from a monomer other than propylene.
  • the propylene-based copolymer contained in the third resin layer may be the same as the propylene-based copolymer contained in the first resin layer.
  • the third resin layer may contain only one type of polyolefin resin, or two or more types. When there are two or more types, the combination and ratio of the resins can be selected as desired depending on the purpose.
  • the third resin layer may or may not contain other components not corresponding to the polyolefin resins as long as the effects of the present invention are not impaired.
  • the other components may be either resin components (sometimes referred to as “other resin components” in this specification) or non-resin components (sometimes referred to as “other non-resin components” in this specification).
  • the other resin components and other non-resin components contained in the third resin layer may be the same as the other resin components and other non-resin components contained in the first resin layer.
  • the third resin layer may contain only one type of other component, or two or more types. If there are two or more types, the combination and ratio of these components can be selected as desired depending on the purpose.
  • the third resin layer may contain only one type of polyolefin resin of the same type, or two or more types. When there are two or more types, the combination and ratio of the resins can be selected as desired depending on the purpose.
  • the content ratio of the polyolefin resin to the total mass of the third resin layer is preferably 90 to 100 mass%, more preferably 95 to 100 mass%, and may be, for example, any one of 97 to 100 mass% and 99 to 100 mass%.
  • the ratio is usually the same as the ratio of the content of the polyolefin resin to the total content (parts by mass) of components that do not vaporize at room temperature in the composition for forming the third resin layer described below.
  • the content of polyolefin-based resin in the third resin layer means the total content of the same type of polyolefin-based resin as the polyolefin-based resin contained in the first resin layer and the second resin layer, and the other polyolefin-based resin.
  • the polyolefin resin contained in the third resin layer is preferably a resin other than an adhesive resin (adhesive polyolefin resin).
  • the adhesive resin may be any known resin, more specifically, for example, a modified polyolefin such as an acid-modified polyolefin having an acidic group.
  • the content ratio of the adhesive resin relative to the total mass of the third resin layer is preferably 0 to 5 mass%, more preferably 0 to 3 mass%, and even more preferably 0 to 1 mass%.
  • the polyolefin resin contained in the third resin layer is preferably a polyethylene resin (e3) (either one or both of polyethylene and ethylene copolymer).
  • the ratio of the content of the polyethylene resin (e3) to the content of the polyolefin resin is preferably 80% by mass or more, more preferably 90% by mass or more, and may be, for example, any of 95% by mass or more, 97% by mass or more, and 99% by mass or more.
  • the ratio is equal to or more than the lower limit, the effect obtained by the third resin layer containing the polyethylene resin (e3) is further enhanced.
  • the puncture strength of such a third resin layer, the laminated film provided with the third resin layer, and the package obtained using the laminated film is further enhanced.
  • the ratio is 100% by mass or less.
  • the ratio is usually the same as the ratio of the content (parts by mass) of the polyethylene resin (e3) to the content (parts by mass) of the polyolefin resin in the composition for forming the third resin layer described below.
  • the content ratio of the polyolefin resin of the same type as the polyolefin resin contained in the first resin layer and the second resin layer to the total mass of the third resin layer is preferably 80 to 100 mass%, more preferably 90 to 100 mass%, and may be, for example, any one of 95 to 100 mass% and 99 to 100 mass%.
  • the content is equal to or more than the lower limit, the reusability of the laminated film is further increased.
  • the above ratio is usually the same as the ratio of the content (parts by mass) of polyolefin-based resin of the same type as the polyolefin-based resin contained in the first resin layer and the second resin layer to the total content (parts by mass) of components that do not vaporize at room temperature in the composition for forming the third resin layer described below.
  • the polyolefin resin contained in the third resin layer is preferably polyethylene.
  • a more preferred example of the third resin layer is a third resin layer containing, as the polyolefin resin, either or both of linear low-density polyethylene and metallocene-catalyzed linear low-density polyethylene.
  • the puncture strength of such a third resin layer, the laminated film provided with the third resin layer, and the package obtained using the laminated film is further increased.
  • the linear low density polyethylene contained in the third resin layer is preferably a linear low density polyethylene having structural units derived from octene (C8-LLDPE), and the metallocene-catalyzed linear low density polyethylene is preferably a metallocene-catalyzed linear low density polyethylene having structural units derived from octene (C8-mLLDPE).
  • the third resin layer is a third resin layer containing, as the polyolefin resin, either or both of a linear low-density polyethylene (C8-LLDPE) having a structural unit derived from octene and a metallocene-catalyzed linear low-density polyethylene (C8-mLLDPE) having a structural unit derived from octene.
  • C8-LLDPE linear low-density polyethylene
  • C8-mLLDPE metallocene-catalyzed linear low-density polyethylene
  • the ratio of the total content of the linear low density polyethylene and the metallocene-catalyzed linear low density polyethylene to the content of the polyolefin resin in the third resin layer (([content of linear low density polyethylene in the third resin layer (parts by mass)] + [content of metallocene-catalyzed linear low density polyethylene in the third resin layer (parts by mass)]) / [content of polyolefin resin in the third resin layer (parts by mass)] ⁇ 100) is preferably 80% by mass or more, more preferably 90% by mass or more, and may be, for example, any one of 95% by mass or more, 97% by mass or more, and 99% by mass or more.
  • the ratio is equal to or more than the lower limit, the puncture strength of such a third resin layer, the laminate film provided with the third resin layer, and the package obtained using the laminate film is further increased.
  • the ratio is 100% by mass or less.
  • the above ratio is usually the same as the ratio of the total content of the linear low-density polyethylene and the metallocene-catalyzed linear low-density polyethylene to the content of the polyolefin-based resin in the composition for forming the third resin layer described below (([Content of linear low-density polyethylene (parts by mass) in the composition for forming the third resin layer] + [Content of metallocene-catalyzed linear low-density polyethylene (parts by mass) in the composition for forming the third resin layer]) / [Content of polyolefin-based resin in the composition for forming the third resin layer (parts by mass)] ⁇ 100).
  • the content of linear low density polyethylene in the third resin layer and the composition for forming the third resin layer is the total content of linear low density polyethylene having a structural unit derived from octene and other linear low density polyethylene in the third resin layer and the composition for forming the third resin layer.
  • the content of metallocene-catalyzed linear low density polyethylene in the third resin layer and the composition for forming the third resin layer is the total content of metallocene-catalyzed linear low density polyethylene having a structural unit derived from octene and other metallocene-catalyzed linear low density polyethylene in the third resin layer and the composition for forming the third resin layer.
  • the third resin layer or the composition for forming the third resin layer does not contain any component selected from the group consisting of linear low-density polyethylene having a structural unit derived from octene, other linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene having a structural unit derived from octene, and other metallocene-catalyzed linear low-density polyethylene
  • the content of that component in the third resin layer or the composition for forming the third resin layer is 0 parts by mass.
  • the third resin layer contains, as the polyolefin resin, either one or both of a linear low density polyethylene and a metallocene-catalyzed linear low density polyethylene
  • the third resin layer is preferably a 100% or 150% polyester resin, and more preferably a 100% or 150% polyester resin.
  • the ratio of the total content of the third resin layer (([C8-LLDPE content (parts by mass) of the third resin layer] + [C8-mLLDPE content (parts by mass) of the third resin layer]) / ([LLDPE content (parts by mass) of the third resin layer] + [mLLDPE content (parts by mass) of the third resin layer]) ⁇ 100) is preferably 50 mass% or more, and may be, for example, any of 75 mass% or more, 80 mass% or more, 90 mass% or more, 95 mass% or more, 97 mass% or more, and 99 mass% or more.
  • the ratio is 100% by mass or less.
  • the ratio is usually the same as the ratio of the total content of the linear low density polyethylene (C8-LLDPE) having a structural unit derived from octene and the metallocene-catalyzed linear low density polyethylene (C8-mLLDPE) having a structural unit derived from octene to the total content of the linear low density polyethylene and the metallocene-catalyzed linear low density polyethylene in the composition for forming the third resin layer described later (([C8-LLDPE content (parts by mass) of the composition for forming the third resin layer] + [C8-mLLDPE content (parts by mass) of the composition for forming the third resin layer]) / ([LLDPE content (parts by mass) of the composition for )
  • the third resin layer or the composition for forming the third resin layer does not contain any component selected from the group consisting of linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, linear low-density polyethylene having a structural unit derived from octene, and metallocene-catalyzed linear low-density polyethylene having a structural unit derived from octene
  • the content of that component in the third resin layer or the composition for forming the third resin layer is 0 parts by mass.
  • the third resin layer may be one layer (single layer) or may be two or more layers. When the third resin layer is made of multiple layers, these multiple layers may be the same or different from each other, and the combination of these multiple layers is not particularly limited as long as it does not impair the effects of the present invention.
  • the third resin layer preferably consists of one layer (single layer).
  • the thickness of the third resin layer is not particularly limited and can be set arbitrarily depending on the application of the laminate film and the thickness of the laminate film.
  • the thickness of the third resin layer is preferably 50 ⁇ m or more, and may be, for example, 100 ⁇ m or more or 150 ⁇ m or more.
  • the thickness of the third resin layer is equal to or more than the lower limit, the effect obtained by providing the laminate film with the third resin layer is enhanced. That is, the puncture strength between the laminate film and the package obtained using the laminate film is enhanced.
  • the thickness of the third resin layer is preferably 240 ⁇ m or less, and may be, for example, 185 ⁇ m or less or 125 ⁇ m or less.
  • the thickness of the third resin layer be equal to or less than the upper limit, the thickness of the laminated film can be made thinner.
  • the thickness of the third resin layer is particularly suitable to be equal to or less than the upper limit, and in that case, the effect obtained by the laminated film having the first resin layer and the second resin layer is enhanced.
  • the third resin layer is made up of a plurality of layers, the total thickness of these layers is preferably within the above-mentioned numerical range.
  • the thickness of the third resin layer shown here is particularly suitable when the thickness of the laminated film is 60 to 250 ⁇ m, as described below.
  • the third resin layer is preferably a non-stretched layer (film).
  • the third resin layer be a non-stretched layer, the formability of the laminated film is improved.
  • the laminate film of the present embodiment may have other layers that do not fall into the category of the first resin layer, the second resin layer, or the third resin layer, as long as the effects of the present invention are not impaired; however, it is preferable that the laminate film does not have the other layers.
  • the other layer is a layer that does not contain the same type of polyolefin resin, and since the laminated film does not have such other layers, its suitability for recycling is improved and its puncture strength and pinhole resistance can be more easily adjusted.
  • the thickness (total thickness) of the laminate film is not particularly limited, but is preferably 60 to 250 ⁇ m, and may be, for example, any one of 60 to 130 ⁇ m, 120 to 190 ⁇ m, and 180 to 250 ⁇ m.
  • the thickness of the laminate film is equal to or greater than the lower limit, the strength of the laminate film is increased.
  • the thickness of the laminate film is equal to or less than the upper limit, the laminate film can be made thinner.
  • the laminated film it is preferable that all layers constituting the laminated film (e.g., the first resin layer, the second resin layer, and the third resin layer) are unstretched layers (films).
  • unstretched laminated films have particularly excellent formability and are particularly suitable for forming deep-draw packaging bodies, for example.
  • the first resin layer, the second resin layer and the third resin layer each contain a polyethylene resin as the same type of polyolefin resin.
  • the first resin layer contains, as the same type of polyolefin-based resin, one or more selected from the group consisting of low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, and ethylene-vinyl acetate copolymer
  • the second resin layer contains, as the same type of polyolefin-based resin, one or more selected from the group consisting of high-density polyethylene, low-density polyethylene, linear low-density polyethylene, and metallocene-catalyzed linear low-density polyethylene
  • the third resin layer contains, as the same type of polyolefin-based resin, either one or both of linear low-density polyethylene and metallocene-catalyzed linear low-den
  • part or all of the linear low density polyethylene in each of the first resin layer, the second resin layer and the third resin layer may be a linear low density polyethylene having structural units derived from octene (C8-LLDPE), and part or all of the metallocene-catalyzed linear low density polyethylene may be a metallocene-catalyzed linear low density polyethylene having structural units derived from octene (C8-LLDPE).
  • An example of a preferred laminate film of the present embodiment is a laminate film configured by laminating a first resin layer, a third resin layer, and a second resin layer in this order in the thickness direction, the first resin layer, the second resin layer, and the third resin layer each contain the same type of polyolefin-based resin;
  • the ratio of the thickness of the third resin layer to the thickness of the laminate film is more than 85%, The ratio of the thickness of the first resin layer to the thickness of the laminate film is 7.5% or less;
  • the ratio of the thickness of the second resin layer to the thickness of the laminate film is 7.5% or less
  • the second resin layer and the third resin layer contain a polyethylene-based resin as the polyolefin-based resin
  • the first resin layer is a non-easy peel type sealant layer containing a polyethylene resin as the polyolefin resin, or is an easy peel layer containing a polyethylene resin and a polypropylene resin as the polyolefin resin
  • An example of the laminate film is one in which the first resin layer, the second resin layer, and the third resin layer each contain a polyethylene resin as the same type of polyolefin resin.
  • a more preferred example of the laminate film of the present embodiment is a laminate film configured by laminating a first resin layer, a third resin layer, and a second resin layer in this order in the thickness direction, the first resin layer, the second resin layer, and the third resin layer each contain the same type of polyolefin-based resin;
  • the ratio of the thickness of the third resin layer to the thickness of the laminate film is more than 85%, The ratio of the thickness of the first resin layer to the thickness of the laminate film is 7.5% or less;
  • the ratio of the thickness of the second resin layer to the thickness of the laminate film is 7.5% or less,
  • the second resin layer contains, as the polyolefin-based resin, one or more selected from the group consisting of high-density polyethylene, low-density polyethylene, linear low-density polyethylene, and metallocene-catalyzed linear low-density polyethylene;
  • the third resin layer contains, as the polyolefin resin, either or both of a linear low-density polyethylene and a metallocene-catalyzed linear low-density polyethylene, the first resin layer is a non-easy peel type sealant layer containing, as the polyolefin-based resin, one or more types selected from the group consisting of polyethylene and ethylene-based copolymers, or an easy peel layer containing, as the polyolefin-based resin, one or more types selected from the group consisting of polyethylene and
  • a more preferable example of the laminate film of the present embodiment is a laminate film configured by laminating a first resin layer, a third resin layer, and a second resin layer in this order in the thickness direction, the first resin layer, the second resin layer, and the third resin layer each contain the same type of polyolefin-based resin;
  • the ratio of the thickness of the third resin layer to the thickness of the laminate film is more than 85%, The ratio of the thickness of the first resin layer to the thickness of the laminate film is 7.5% or less;
  • the ratio of the thickness of the second resin layer to the thickness of the laminate film is 7.5% or less,
  • the second resin layer contains, as the polyolefin-based resin, one or more selected from the group consisting of high-density polyethylene, low-density polyethylene, linear low-density polyethylene, and metallocene-catalyzed linear low-density polyethylene;
  • the third resin layer contains, as the polyolefin resin, either or both of a linear low-density polyethylene having a structural unit derived from octene and a metallocene-catalyzed linear low-density polyethylene having a structural unit derived from octene;
  • the first resin layer is a non-easy peel type sealant layer containing, as the polyolefin-based resin, one or more selected from the group consisting of low-density polyethylene, linear low-density polyethylene, metallocene
  • a part or all of the linear low density polyethylene contained in the first resin layer may be a linear low density polyethylene having structural units derived from octene
  • a part or all of the metallocene-catalyzed linear low density polyethylene may be a metallocene-catalyzed linear low density polyethylene having structural units derived from octene
  • a part or all of the linear low density polyethylene contained in the second resin layer may be a linear low density polyethylene having structural units derived from octene
  • a part or all of the metallocene-catalyzed linear low density polyethylene may be a metallocene-catalyzed linear low density polyethylene having structural units derived from octene.
  • some or all of the linear low-density polyethylene contained in the first resin layer and the second resin layer as the same type of polyolefin resin may be a linear low-density polyethylene having a structural unit derived from octene, or some or all of the metallocene-catalyzed linear low-density polyethylene may be a metallocene-catalyzed linear low-density polyethylene having a structural unit derived from octene.
  • the laminated film can be produced, for example, by a feed block method in which resins or resin compositions that are materials for forming each layer are melt-extruded using several extruders, a co-extrusion T-die method such as a multi-manifold method, or an air-cooled or water-cooled co-extrusion inflation method.
  • a mixture of two or more components may be directly fed into the extruder as the resin composition, or a pre-kneaded material in which two or more components are kneaded in advance may be fed into the extruder as the resin composition.
  • the pre-kneaded mixture can be obtained, for example, by melt-kneading two or more components using an apparatus such as a twin-screw extruder or a Banbury mixer.
  • Laminated films can also be produced by first preparing two or more films separately to form any two or more of these layers, then laminating them together using a thermal lamination method or similar without using adhesive, and then, if necessary, laminating the other layers in the desired arrangement.
  • the resin composition that will be used to form any of the layers in the laminated film may be manufactured by adjusting the type and content of the components so that the layer to be formed contains the desired components in the desired content.
  • the content ratio of the components that do not vaporize at room temperature in the resin composition is usually the same as the content ratio of the components in the layer formed from this resin composition.
  • the resin composition for forming the first resin layer (first resin layer 11 in the laminate film 1 shown in FIG. 1) (sometimes referred to herein as "composition for forming first resin layer")
  • the resin composition for forming the second resin layer (second resin layer 12 in the laminate film 1 shown in FIG. 1) (sometimes referred to herein as “composition for forming second resin layer")
  • the resin composition for forming the third resin layer (third resin layer 13 in the laminate film 1 shown in FIG. 1) (sometimes referred to herein as "composition for forming third resin layer”) are, for example, resin compositions each containing the polyolefin resin and, if necessary, the other components.
  • the other components are the components described above.
  • a packaging body according to one embodiment of the present invention is constructed using the laminate film according to one embodiment of the present invention described above. Since the packaging body of the present embodiment is constructed using the laminated film, it has high pinhole resistance, and for example, even if a twisting force is applied to the packaging body, the occurrence of pinholes (breakage) is suppressed, and the packaging body of the present embodiment has high torsion resistance. Furthermore, the packaging body of the present embodiment has high puncture strength, and for example, even if a sharp part exists in the stored item and such a part hits the packaging body, breakage of the packaging body is suppressed. Furthermore, by using the laminate film having high formability or heat resistance, it is possible to improve the formability or heat resistance of the packaging body of this embodiment.
  • the packaging of this embodiment has the above-mentioned characteristics, and is therefore useful, for example, as a packaging for packaging objects while maintaining a high level of hygiene, and is particularly useful for packaging medical devices such as catheters and syringes.
  • the packaging body of this embodiment may be a known packaging body, except that the laminated film is used.
  • a preferred package of this embodiment is, for example, a package that has a lid material and a base material, and is constructed by sealing the lid material and the base material, and one or both of the lid material and the base material are constructed using the laminate film.
  • the base material may be, for example, a molded body of a resin film having a recess for forming a storage section in a packaging body.
  • the resin film may be the laminate film or a resin film other than the laminate film.
  • a more preferred package is one in which the base material is a molded product of the laminated film. That is, a more preferred package in this embodiment is one that includes a lid material and a base material, is configured by sealing the lid material and the base material, and the base material is a molded product of the laminated film.
  • the cover material When the base material is a molded product of the laminate film, the cover material may be the laminate film or a resin film other than the laminate film. On the other hand, when the base material is not a molded product of the laminated film, the cover material is the laminated film.
  • FIG. 2 is a cross-sectional view illustrating an example of the packaging body of the present embodiment.
  • the same components as those shown in FIG. 1 are denoted by the same reference numerals as in FIG. 1, and detailed description thereof will be omitted.
  • the packaging body 101 shown in Fig. 2 is configured to include a lid material 8 and a base material 10.
  • the base material 10 is configured using the laminated film 1 shown in Fig. 1, and more specifically, is a molded body (heat-molded body) of the laminated film 1. In the base material 10 in FIG. 2, the distinction between the layers in the laminate film 1 constituting it is omitted.
  • the base material 10 has a recess 100 formed therein.
  • One side 10b of the base material 10 (sometimes referred to as the "second side” in this specification) and one side 8b of the lid material 8 (sometimes referred to as the "second side” in this specification) are both sealing surfaces, and these face each other in the packaging body 101.
  • the second surface 10b of the base material 10 excluding the area where the recess 100 is formed, and the second surface 8b of the lid material 8, near the peripheral edge, are overlapped. At least the areas near the peripheral edges of the overlapped areas of the base material 10 and the lid material 8 are sealed to form the package 101.
  • a storage section 101a is formed between the second surface 10b of the base material 10 and the second surface 8b of the lid material 8.
  • An item 9 is stored in the storage section 101a.
  • the thickness of the base material 10 at its flat portion may be the same as the thickness of the laminated film described above.
  • the thickness of the lid material 8 is preferably 50 to 300 ⁇ m.
  • the second surface 10b of the base material 10 is preferably the same as the second surface 11b of the first resin layer 11 in the laminate film 1.
  • the other surface 10a of the base material 10 (sometimes referred to as the "first surface” in this specification) is preferably the same as the first surface 12a of the second resin layer 12 in the laminate film 1.
  • the lid material 8 may be the laminate film or a resin film other than the laminate film.
  • the lid material 8 may be the laminate film 1 shown in FIG. 1 or may be any other laminate film.
  • the packaging body of this embodiment is not limited to the packaging body 101 shown in Figure 2, and for example, some of the configuration of the packaging body 101 may be changed, deleted, or added within the scope that does not deviate from the spirit of the present invention.
  • the base material 10 is formed using the laminate film 1 shown in FIG. 1, but may be formed using a laminate film of this embodiment other than the laminate film 1.
  • the base material 10 is made of the laminate film 1 shown in Fig. 1, but may be made of a resin film other than the laminate film of this embodiment. In that case, however, the lid material 8 is the laminate film of this embodiment.
  • the packaging body can be produced by packaging an object to be packaged (in other words, an object to be stored) with the laminate film.
  • the packaging body can be produced in the same manner as the conventional packaging body, except that the laminate film is used instead of the conventional resin film.
  • the first resin layer in the laminate film or a molded product thereof is placed toward the object to be packaged and the second resin layer is placed toward the opposite side to the object to be packaged, and the object is packaged.
  • a deep-drawn molded body of the laminated film (i.e., the base material) and the laminated film or another resin film (i.e., the lid material) form a storage section for storing the packaged item (in other words, the contents), while the packaged item is stored in the deep-drawn molded body and the film are heat-sealed in the areas other than the storage section, thereby producing a deep-drawn package.
  • the sealing temperature during heat sealing is preferably 105 to 135°C, and the sealing pressure is preferably 0.3 to 0.6 MPa.
  • the heat molding can be performed by a known method.
  • the molding temperature during heat molding is preferably 90 to 120°C.
  • LLDPE Linear low-density polyethylene having structural units derived from octene (ELITE 5220G, manufactured by The Dow Chemical Company, density 0.915 g/cm 3 , MFR 3.5 g/10 min, melting point 123° C.
  • LDPE low-density polyethylene ("Sumikathene (registered trademark) L211" manufactured by Sumitomo Chemical Co., Ltd., density 0.924 g/cm 3 , MFR 2 g/10 min, melting point 112° C.)
  • HDPE High density polyethylene ("Hi-Zex 2200J” manufactured by Prime Polymer Co., Ltd., density 0.964 g/cm 3 , MFR 5.2 g/10 min, melting point 133° C.)
  • hPP homopolypropylene (Prime Polypro F-300SP, manufactured by Prime Polymer Co., Ltd., melting point 163°C)
  • EVA Ethylene-
  • a laminated film having the structure shown in FIG. 1 was produced by the following procedure. That is, the LLDPE, the LLDPE, and the resin composition (1) were co-extruded in this order to obtain a laminated film (thickness 150 ⁇ m) in which a first resin layer (thickness 7.5 ⁇ m), a third resin layer (thickness 135 ⁇ m), and a second resin layer (thickness 7.5 ⁇ m) were laminated in this order in the thickness direction.
  • the first resin layer, the third resin layer, and the second resin layer were all unstretched layers.
  • a medical packaging material (Tyvek (registered trademark) 1073B, manufactured by DuPont) was prepared as a lid material.
  • the lid material and the base material obtained above were heat sealed under the following conditions to package the syringe, thereby producing a package (deep-draw package). (Heat sealing conditions) Sealing pressure: 0.45 MPa (4.5 kgf/ cm2 ) Sealing time: 3.5 seconds Sealing temperature: 125°C
  • a laminated film having the structure shown in FIG. 1 was produced by the following procedure. That is, the resin composition (2), the LLDPE, and the resin composition (1) were co-extruded in this order to obtain a laminated film (thickness 150 ⁇ m) in which a first resin layer (thickness 7.5 ⁇ m), a third resin layer (thickness 135 ⁇ m), and a second resin layer (thickness 7.5 ⁇ m) were laminated in this order in the thickness direction.
  • the first resin layer, the third resin layer, and the second resin layer were all unstretched layers.
  • Example 2 A package was produced in the same manner as in Example 1, except that the monolayer film obtained above was used instead of the laminated film. The obtained package was evaluated in the same manner as in Example 1. The results are shown in Table 2. In Table 2, the single layer film of this comparative example is shown in the column for the first resin layer for the sake of convenience.
  • a laminated film (thickness 150 ⁇ m) was obtained by laminating the first resin layer (thickness 7.5 ⁇ m), the third resin layer (thickness 124.5 ⁇ m), and the second resin layer (thickness 18 ⁇ m) in this order in the thickness direction in the same manner as in Example 1, except that the conditions for co-extrusion of the resins were changed so that the thickness of the second resin layer was thicker and the thickness of the third resin layer was thinner than in Example 1.
  • the first resin layer, the third resin layer, and the second resin layer are all unstretched layers.
  • Example 1 and 2 the number of pinholes found in the laminated films after the Gelbo flex test was one, and the pinhole resistance of the laminated films was extremely high. Furthermore, in Examples 1 and 2, the puncture strength of the laminated film was 10.2 N or more (10.2 to 10.3 N), which was sufficiently high. Furthermore, in Examples 1 and 2, the packaging materials had high durability. In Examples 1 and 2, the ratio of the thickness of the third resin layer to the thickness of the laminated film was 90%.
  • the first resin layer, the second resin layer, and the third resin layer in the laminated film contained the same type of polyolefin-based resin, and the laminated film was highly suitable for reuse.
  • Comparative Examples 1 and 3 the number of pinholes found in the laminated film after the Gelbo flex test was 4 or more (4 to 6), and the pinhole resistance of the laminated film was low.
  • the ratio of the thickness of the third resin layer to the thickness of the laminated film was 15%, and further, the third resin layer was an adhesive layer containing an adhesive resin as a main component.
  • the ratio of the thickness of the third resin layer to the thickness of the laminated film was 83%.
  • the second resin layer in the laminated film did not contain the same type of polyolefin resin, and the laminated film was poorly suited for reuse.
  • Comparative Example 2 the puncture strength of the monolayer film was low at 4.8 N. Furthermore, in Comparative Example 2, the durability of the package was low.
  • the monolayer film of Comparative Example 2 was a film made of LDPE.
  • the present invention can be used to manufacture various types of packaging that can be reused after use.
  • Laminated film 11 First resin layer 12: Second resin layer 13: Third resin layer 101: Package 8: Lid material 10: Base material T1 : Thickness of laminated film, T13 : Thickness of third resin layer

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WO2019065938A1 (ja) * 2017-09-29 2019-04-04 大日本印刷株式会社 液体内容物包装用のシーラントフィルムとそれを含む積層体、及び液体内容物用包装材料、液体内容物用包装体
JP2022087183A (ja) * 2020-03-30 2022-06-09 住友ベークライト株式会社 積層フィルム
WO2022107575A1 (ja) * 2020-11-19 2022-05-27 東洋紡株式会社 ポリオレフィン系樹脂フィルム、及びそれを用いた積層体
WO2022107576A1 (ja) * 2020-11-19 2022-05-27 東洋紡株式会社 ポリオレフィン系樹脂フィルム、及びそれを用いた積層体
JP2023044963A (ja) * 2021-09-21 2023-04-03 住友ベークライト株式会社 積層フィルム及び包装体
JP2023113593A (ja) * 2022-02-03 2023-08-16 フタムラ化学株式会社 ポリプロピレン系フィルム及び積層フィルム

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