WO2024070894A1 - Film d'emballage, matériau d'emballage et emballage alimentaire - Google Patents

Film d'emballage, matériau d'emballage et emballage alimentaire Download PDF

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Publication number
WO2024070894A1
WO2024070894A1 PCT/JP2023/034336 JP2023034336W WO2024070894A1 WO 2024070894 A1 WO2024070894 A1 WO 2024070894A1 JP 2023034336 W JP2023034336 W JP 2023034336W WO 2024070894 A1 WO2024070894 A1 WO 2024070894A1
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Prior art keywords
packaging film
packaging
less
mol
propylene
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PCT/JP2023/034336
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English (en)
Japanese (ja)
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拓也 田村
裕之 若木
琢巳 正本
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三井化学東セロ株式会社
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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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • 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

Definitions

  • the present invention relates to packaging films, packaging materials, and food packages.
  • OPP film Biaxially oriented polypropylene film
  • OPP film has an excellent balance of performance, including processability, water vapor barrier properties, transparency, mechanical strength, and rigidity, and is used, for example, as a packaging film for packaging food.
  • Patent Document 1 JP Patent Publication No. 2015-044406
  • Patent Document 1 describes a matte-finished polypropylene laminated stretched film in which a polypropylene resin matte layer (B) having a three-dimensional average surface roughness of 0.15 ⁇ m or more is laminated on at least one surface of a polypropylene resin layer (A), the polypropylene laminated stretched film being characterized by having a heat shrinkage rate of 9% or less in the MD and TD directions at 150° C., an impact strength of 0.6 J or more, and a haze of 40% or more.
  • Patent Document 1 describes that the laminated stretched polypropylene film can have a low shrinkage rate and high rigidity comparable to those of PET at 150° C., and can therefore be made thinner.
  • the present invention was made in consideration of the above circumstances, and provides a packaging film, packaging material, and food package that have an improved performance balance between the thermal dimensional stability and bag tear resistance of the packaging material after high retort processing.
  • a packaging film comprising a biaxially oriented film layer containing homopolypropylene and a surface layer (A) provided on at least one side of the biaxially oriented film layer, in which the content of structural units derived from ⁇ -olefins having a carbon number of 2 to 10 (excluding propylene) is 1.5 mol % to 20.0 mol % when the total number of moles of structural units derived from all monomers contained in the packaging film is taken as 100 mol %, improves the performance balance of thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, and thus arrived at the present invention.
  • the present invention provides the following packaging films, packaging materials, and food packages.
  • a biaxially oriented film layer containing homopolypropylene A packaging film comprising a surface layer (A) provided on at least one surface of the biaxially stretched film layer, A packaging film in which the content of structural units derived from ⁇ -olefins having a carbon number of 2 to 10 ( ⁇ -olefins excluding propylene) is 1.5 mol % or more and 20.0 mol % or less, when the total number of moles of structural units derived from all monomers contained in the packaging film is 100 mol %.
  • the content of the random copolymer in the biaxially oriented film layer is 5% by mass or more and 20% by mass or less when the total amount of all components contained in the biaxially oriented film layer is 100% by mass.
  • [4] The packaging film according to [2] or [3] above, wherein the content of structural units derived from ⁇ -olefins having 2 to 10 carbon atoms ( ⁇ -olefins excluding propylene) is 2.0 mol % or more and 10.0 mol % or less when the total number of moles of structural units derived from all monomers contained in the random copolymer is 100 mol %.
  • [5] The packaging film according to any one of [2] to [4], wherein the MFR of the random copolymer, measured in accordance with ASTM D1238 under conditions of 230° C. and a load of 2.16 kg, is 0.01 g/10 min or more and 30.0 g/10 min or less.
  • [6] The packaging film according to any one of [2] to [5] above, wherein the melting point of the random copolymer as measured by DSC is 125° C. or higher and 150° C. or lower.
  • the surface layer (A) contains at least one selected from the group consisting of a propylene block copolymer, a propylene and ethylene copolymer, and an ethylene and butene copolymer.
  • the packaging film according to [14] above which is used as a packaging material for retort food.
  • the present invention makes it possible to provide a packaging film, packaging material, and food package that have an improved performance balance between the thermal dimensional stability and bag tear resistance of the packaging material after high retort processing.
  • FIG. 2 is a cross-sectional view showing a schematic example of the structure of the packaging film of the present embodiment.
  • FIG. 2 is a cross-sectional view showing a schematic example of the structure of the packaging film of the present embodiment.
  • ⁇ Packaging film> 1 and 2 are cross-sectional views that diagrammatically show an example of the structure of a packaging film 100 according to the present embodiment.
  • the packaging film 100 of this embodiment is a packaging film 100 comprising a biaxially oriented film layer 101 containing homopolypropylene and a surface layer (A) 103 provided on at least one side of the biaxially oriented film layer 101, and when the total number of moles of structural units derived from all monomers contained in the packaging film 100 is taken as 100 mol %, the content of structural units derived from ⁇ -olefins having a carbon number of 2 or more and 10 or less (however, ⁇ -olefins exclude propylene) is 1.5 mol % or more and 20.0 mol % or less.
  • packaging films containing biaxially oriented polypropylene films are required to have an improved performance balance between thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment.
  • a packaging film having a content of structural units derived from ⁇ -olefins ( ⁇ -olefins excluding propylene) having a carbon number of 2 or more and 10 or less of 1.5 mol % or more and 20.0 mol % or less can further improve the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, thereby arriving at the present invention.
  • a packaging material using the packaging film 100 of this embodiment the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment can be improved. Furthermore, a packaging material using the packaging film 100 of this embodiment can improve the performance balance of the thermal dimensional stability, lamination strength, heat seal strength, and bag tear resistance of the packaging material after high retort processing.
  • the packaging film 100 of this embodiment when the total number of moles of structural units derived from all monomers contained in the packaging film 100 is taken as 100 mol %, the content of structural units derived from ⁇ -olefins having a carbon number of 2 or more and 10 or less (however, ⁇ -olefins exclude propylene) is 1.5 mol % or more and 20.0 mol % or less.
  • the content of structural units derived from ⁇ -olefins (wherein ⁇ -olefins exclude propylene) having a carbon number of 2 to 10 is preferably 1.6 mol% or more, more preferably 1.8 mol% or more, even more preferably 2.0 mol% or more, even more preferably 2.5 mol% or more, even more preferably 3.0 mol% or more, even more preferably 3.5 mol% or more, and even more preferably 5.0 mol% or more from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, and from the viewpoint of making the packaging material into a mono-material, it is preferably 15.0 mol% or less, more preferably 10.0 mol% or less, even more preferably 8.0 mol% or less, even more preferably 7.0 mol% or less, even
  • the formability of the packaging film 100 is further improved and thickness unevenness is further reduced.
  • the content of structural units derived from ⁇ -olefins having 2 to 10 carbon atoms ( ⁇ -olefins excluding propylene) in the packaging film 100 can be measured by the method described in the Examples.
  • the packaging film 100 of this embodiment has an overall haze of preferably 2.0% or more, more preferably 3.0% or more, even more preferably 5.0% or more, even more preferably 10.0% or more, even more preferably 20.0% or more, even more preferably 30.0% or more, even more preferably 40.0% or more, and even more preferably 50.0% or more, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, and preferably 80.0% or less, more preferably 70.0% or less, and even more preferably 65.0% or less, from the viewpoint of further improving the transparency of the packaging material.
  • the overall haze is an evaluation index for the unevenness of the surface of the packaging film.
  • the overall haze is measured by a haze meter in accordance with JIS K7136 (2000).
  • the packaging film 100 of this embodiment has an internal haze of preferably 5.0% or less, more preferably 3.0% or less, even more preferably 2.0% or less, even more preferably 1.5% or less, and even more preferably 1.0% or less.
  • the lower limit of the internal haze is not particularly limited, and may be, for example, 0.1% or more, or 0.3% or more.
  • the internal haze is measured by a haze meter in accordance with JIS K7136 (2000).
  • the packaging film 100 of this embodiment has an external haze of preferably 2.0% or more, more preferably 3.0% or more, even more preferably 5.0% or more, even more preferably 10.0% or more, even more preferably 20.0% or more, even more preferably 30.0% or more, even more preferably 40.0% or more, and even more preferably 50.0% or more, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, and preferably 80.0% or less, more preferably 70.0% or less, and even more preferably 65.0% or less, from the viewpoint of further improving the transparency of the packaging material.
  • External haze is an evaluation index for the unevenness of the surface of a packaging film.
  • the overall haze, internal haze, and external haze of the packaging film can be adjusted, for example, by adjusting the constituent material, thickness, and stretching ratio of the biaxially stretched film layer 101, and the constituent material and thickness of the surface layer (A) 103, etc.
  • the overall haze of the adhesive-coated sample is preferably 5.0% or less, more preferably 3.0% or less, even more preferably 2.0% or less, even more preferably 1.5% or less, and even more preferably 1.0% or less.
  • the lower limit of the overall haze of the adhesive-coated sample is not particularly limited, but may be, for example, 0.1% or more, or 0.3% or more.
  • the adhesive-coated sample is prepared as follows.
  • a two-component curing polyurethane adhesive (a mixture of a urethane resin as the main agent, an isocyanate curing agent, and an ethyl acetate solvent in a ratio of 9.0:1.0:7.5 (mass ratio)) is applied to the surface of the surface layer (A) so that the dry coating amount is 2.7 g/ m2 , and then the ethyl acetate solvent is dried to prepare an adhesive-coated sample.
  • the two-component curing polyurethane adhesive in this specification for example, the two-component curing polyurethane adhesive described in the examples can be used.
  • the overall haze of the adhesive-coated sample is measured using a haze meter in accordance with JIS K7136 (2000).
  • the difference in haze before and after adhesive application is preferably 1.0% or more, preferably 2.0% or more, more preferably 3.0% or more, even more preferably 4.0% or more, even more preferably 5.0% or more, even more preferably 10.0% or more, even more preferably 20.0% or more, even more preferably 30.0% or more, even more preferably 40.0% or more, and even more preferably 50.0% or more, from the viewpoint of further improving the transparency of the packaging material, and is preferably 80.0% or less, more preferably 70.0% or less, and even more preferably 65.0% or less.
  • the packaging film 100 expands in the TD direction when heat-treated at 120°C for 15 minutes in accordance with JIS C2151 (2019).
  • the thermal expansion coefficient in the TD direction of the packaging film 100 when heated at 120°C for 15 minutes is, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment and further suppressing the occurrence of wrinkles when the packaging film 100 is thermally processed, preferably 0.1% or more, more preferably 0.2% or more, even more preferably 0.3% or more, even more preferably 0.4% or more, and even more preferably 0.5% or more; and from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment and further suppressing the occurrence of wrinkles when the packaging film 100 is thermally processed, it is preferably 2.0% or less, more preferably 1.5% or less, even more preferably 1.2% or less, and even more preferably 1.0% or less.
  • the thermal expansion coefficient of the packaging film 100 in the TD direction when the film is heat-treated at 120° C. for 15 minutes is calculated by the following method.
  • a test piece of 10 cm x 10 cm is cut out from the packaging film 100.
  • the test piece is then heat-treated for 15 minutes at 120° C.
  • the length of the test piece in the TD direction after the heat treatment is defined as TD 1 [cm], and the thermal expansion coefficient in the TD direction [%] is calculated by 100 x (TD 1 - 10)/10.
  • the heat shrinkage rate in the MD direction of the packaging film 100 when heated at 120°C for 15 minutes is, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment and further reducing the elongation when the packaging film 100 is thermally processed, preferably 5.0% or less, more preferably 4.0% or less, even more preferably 3.0% or less, even more preferably 2.5% or less, even more preferably 2.2% or less, and even more preferably 2.0% or less, and may be 0.1% or more, 0.3% or more, or 0.5% or more.
  • the thermal shrinkage rate of the packaging film 100 in the MD direction when the packaging film 100 is heat-treated at 120° C. for 15 minutes is calculated by the following method.
  • test piece of 10 cm x 10 cm is cut out from the packaging film 100.
  • the test piece is then heat-treated at 120° C. for 15 minutes.
  • the length of the test piece in the MD direction after heat treatment is taken as MD 1 [cm], and the heat shrinkage rate [%] in the MD direction is calculated by 100 x (10 - MD 1 )/10.
  • X TD [%] and X MD [%] are preferably 7.0% or less, more preferably 6.5% or less, even more preferably 6.0% or less, and even more preferably 5.5% or less, and the lower limit is not particularly limited, but may be, for example, 0.2% or more, or may be 0.5% or more.
  • X TD [%] and X MD [%] of the packaging film 100 are calculated by the following method.
  • a test piece of 10 cm x 10 cm is cut out from the packaging film 100.
  • the test piece is then heat-treated at 150°C for 15 minutes.
  • TD 1 [cm] the length of the test piece in the TD direction after the heat treatment
  • MD 1 [cm] the length of the test piece in the MD direction after the heat treatment
  • X TD [%] is calculated by 100 x (10 - TD 1 )/10
  • X MD [%] is calculated by 100 x (10 - MD 1 )/10.
  • the thermal expansion coefficient and thermal shrinkage coefficient of the packaging film 100 can be adjusted, for example, by adjusting the constituent material, thickness and stretching ratio of the biaxially stretched film layer 101 and the constituent material and thickness of the surface layer (A) 103.
  • the thermal expansion coefficient and thermal shrinkage coefficient of the packaging film 100 can be measured in accordance with JIS C2151 (2019).
  • the thermal expansion coefficient in the TD direction of the packaging film 100 after the high retort treatment is such that the packaging film 100 expands in the TD direction. More specifically, the thermal expansion coefficient in the TD direction of the packaging film 100 after high retort processing is preferably 0.1% or more, more preferably 0.2% or more, from the viewpoint of further improving heat resistance performance, and is preferably 2.0% or less, more preferably 1.5% or less, even more preferably 1.2% or less, and even more preferably 1.0% or less, from the viewpoint of further improving heat resistance performance.
  • the thermal expansion coefficient in the TD direction of the packaging film 100 after the high retort treatment is calculated by the method described in the Examples.
  • the thermal expansion coefficient in the TD direction of the packaging film 100 after the high retort treatment is the thermal expansion coefficient in the TD direction of the packaging film obtained by subjecting a laminate obtained by laminating the packaging film 100 and a sealant film to high retort treatment.
  • the thermal shrinkage rate in the MD direction of the packaging film 100 after high retort processing is preferably 5.0% or less, more preferably 4.0% or less, and even more preferably 3.0% or less, from the viewpoint of further improving the heat resistance performance of the packaging material, and may be 0.1% or more, 0.3% or more, or 0.5% or more, from the viewpoint of further improving the heat resistance performance of the packaging material.
  • the heat shrinkage rate in the MD direction of the packaging film 100 after the high retort treatment is calculated by the method described in the Examples.
  • the heat shrinkage rate in the MD direction of the packaging film 100 after the high retort treatment refers to the heat shrinkage rate in the MD direction of the packaging film obtained by subjecting a laminate obtained by laminating the packaging film 100 and a sealant film to high retort treatment.
  • the lamination strength of the packaging film 100 after high retort processing is preferably 2.5 N/15 mm or more, more preferably 3.0 N/15 mm or more, and even more preferably 4.0 N/15 mm or more.
  • the upper limit is not particularly limited, but may be, for example, 10.0 N/15 mm or less, or 8.0 N/15 mm or less.
  • the laminate strength of the packaging film 100 after the high retort treatment is measured by the method described in the Examples. That is, the laminate strength of the packaging film 100 after the high retort treatment refers to the laminate strength of the packaging film obtained by subjecting the laminate, which is a laminate of the packaging film 100 and a sealant film, to high retort treatment.
  • the heat seal strength of the packaging film 100 after high retort processing is preferably 25 N/15 mm or more, more preferably 26 N/15 mm or more, and even more preferably 27 N/15 mm or more.
  • the upper limit is not particularly limited, but may be, for example, 40 N/15 mm or less, or 35 N/15 mm or less.
  • the heat seal strength of the packaging film 100 after the high retort treatment is measured by the method described in the Examples. That is, the heat seal strength of the packaging film 100 after the high retort treatment refers to the heat seal strength of the packaging film obtained by subjecting a laminate obtained by laminating the packaging film 100 and a sealant film to high retort treatment.
  • the number of times that the packaging film 100 is dropped after the high retort treatment is preferably 6 or more, from the viewpoint of further improving the strength of the packaging material.
  • the number of bag drops of the packaging film 100 after the high retort treatment is measured by the method described in the Examples. That is, the number of bag drops of the packaging film 100 after the high retort treatment refers to the number of bag drops of the packaging film obtained by subjecting the laminate of the packaging film 100 and a sealant film to the high retort treatment.
  • the thickness of the packaging film 100 is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, even more preferably 12 ⁇ m or more, and even more preferably 15 ⁇ m or more, from the viewpoint of further improving the balance of thermal dimensional stability, formability, water vapor barrier properties, cost, mechanical properties, transparency, bag-making properties, ease of handling, appearance, and light weight, and is preferably 100 ⁇ m or less, more preferably 50 ⁇ m or less, even more preferably 40 ⁇ m or less, even more preferably 30 ⁇ m or less, and even more preferably 25 ⁇ m or less.
  • the layers that make up the packaging film 100 are described below.
  • the biaxially oriented film layer 101 comprises homopolypropylene.
  • the biaxially stretched film layer 101 is formed, for example, by biaxially stretching a film made of a propylene-based polymer composition containing homopolypropylene.
  • the biaxially stretched film layer 101 may be a single layer or may be a laminate of multiple layers made of a propylene-based polymer composition, but it is necessary that it is biaxially stretched.
  • the thickness of the biaxially stretched film layer 101 is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, even more preferably 12 ⁇ m or more, and even more preferably 15 ⁇ m or more, from the viewpoint of further improving the balance of the thermal dimensional stability, formability, water vapor barrier properties, cost, mechanical properties, transparency, bag formability, handleability, appearance, and light weight of the packaging film 100, and is preferably 100 ⁇ m or less, more preferably 50 ⁇ m or less, even more preferably 40 ⁇ m or less, even more preferably 30 ⁇ m or less, and even more preferably 20 ⁇ m or less.
  • the ratio of the thickness of the biaxially oriented film layer 101 to the total thickness of the packaging film 100 is preferably 50% or more, more preferably 60% or more, even more preferably 70% or more, even more preferably 75% or more, and preferably 100% or less, more preferably 99% or less, even more preferably 95% or less, even more preferably 90% or less.
  • the propylene-based polymer composition constituting the biaxially stretched film layer 101 of this embodiment contains homopolypropylene.
  • homopolypropylene examples include propylene homopolymers and propylene-based copolymers having a content of structural units derived from ⁇ -olefins other than propylene of 1.5 mol % or less.
  • the content of structural units derived from propylene in the homopolypropylene is 98.5 mol% or more, preferably 98.7 mol% or more, more preferably 99.0 mol% or more, even more preferably 99.5 mol% or more, still more preferably 99.8 mol% or more, and is, for example, 100.0 mol% or less.
  • the ⁇ -olefin other than propylene includes, for example, one or more selected from the group consisting of ethylene and ⁇ -olefins having 4 to 20 carbon atoms, preferably one or more selected from the group consisting of ethylene and ⁇ -olefins having 4 to 6 carbon atoms, more preferably at least one selected from the group consisting of ethylene and 1-butene, and even more preferably ethylene.
  • the content of structural units derived from ⁇ -olefins other than propylene is preferably 1.5 mol % or less, more preferably 1.3 mol % or less, even more preferably 1.0 mol % or less, even more preferably 0.5 mol % or less, and even more preferably 0.2 mol % or less, when the entire homopolypropylene is taken as 100 mol %.
  • the homopolypropylene in the biaxially oriented film layer 101 may be used alone or in combination of two or more kinds.
  • the content of homopolypropylene contained in the biaxially oriented film layer 101 of this embodiment when the total amount of all components contained in the biaxially oriented film layer 101 is taken as 100% by mass, is preferably 80% by mass or more, more preferably 82% by mass or more, even more preferably 85% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, and may be 100% by mass or less, or may be 98% by mass or less.
  • the isotactic mesopentad fraction (mmmm) of the homopolypropylene is preferably 96.0% or more, more preferably 96.5% or more, even more preferably 97.0% or more, even more preferably 97.3% or more, even more preferably 97.5% or more, even more preferably 97.8% or more, and even more preferably 98.0% or more, from the viewpoint of further improving the balance of thermal dimensional stability, heat resistance, water vapor barrier properties, mechanical properties, rigidity, bag formability, and the like of the packaging film 100.
  • the upper limit of the isotactic mesopentad fraction (mmmm) of the homopolypropylene is not particularly limited, but from the viewpoint of ease of production, it is 99.5% or less, more preferably 99.3% or less, and even more preferably 99.0% or less.
  • the isotactic mesopentad fraction (mmmm) is an index of stereoregularity and can be determined by a known method from 13 C-nuclear magnetic resonance (NMR) spectrum.
  • the isotactic mesopentad fraction of the homopolypropylene can be the isotactic mesopentad fraction of a mixture obtained by melt blending two or more types of homopolypropylene by a known method.
  • the melting point of the homopolypropylene is preferably 150°C or higher, more preferably 155°C or higher, even more preferably 160°C or higher, and even more preferably 163°C or higher, and is preferably 180°C or lower, more preferably 175°C or lower, even more preferably 170°C or lower, and even more preferably 168°C or lower.
  • the melting point of the homopolypropylene is the peak temperature of the maximum melting peak.
  • Homopolypropylene can be produced by various methods. For example, it can be produced using known catalysts such as Ziegler-Natta catalysts and metallocene catalysts.
  • the propylene-based polymer composition constituting the biaxially stretched film layer 101 of this embodiment preferably further contains a random copolymer of propylene and an ⁇ -olefin having 2 to 10 carbon atoms (however, the ⁇ -olefin does not include propylene).
  • the ⁇ -olefin having 2 to 10 carbon atoms (however, ⁇ -olefin excluding propylene) preferably includes at least one selected from the group consisting of ethylene and ⁇ -olefins having 4 to 6 carbon atoms, and more preferably includes at least one selected from the group consisting of ethylene and 1-butene.
  • the content of structural units derived from ⁇ -olefins having a carbon number of 2 to 10 ( ⁇ -olefins excluding propylene) in the random copolymer of propylene and ⁇ -olefins having a carbon number of 2 to 10 ( ⁇ -olefins excluding propylene) contained in the biaxially stretched film layer 101 is more than 1.5 mol% when the total number of moles of structural units derived from all monomers contained in the random copolymer is taken as 100 mol%, and from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment and further improving the formability of the packaging film 100, it is preferably 2.0 mol% or more, more preferably 3.0 mol% or more, and even more preferably 4.0 mol% or more, and from the viewpoint of making the packaging material into a mono-material, it is preferably 10.0 mol% or less, more preferably 9.0 mol% or less, even more preferably
  • the MFR of the random copolymer of propylene and an ⁇ -olefin having 2 to 10 carbon atoms (however, ⁇ -olefins exclude propylene) contained in the biaxially stretched film layer 101, measured in accordance with ASTM D1238 under conditions of 230° C. and a load of 2.16 kg, is 0.01 g/10 min or more, preferably 0.1 g/10 min or more, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment and further improving the formability of the packaging film 100.
  • the MFR of the random copolymer can be the MFR of a mixture obtained by melt blending two or more types of random copolymers by a known method.
  • the melting point of the random copolymer of propylene and an ⁇ -olefin having 2 to 10 carbon atoms (wherein ⁇ -olefins exclude propylene) contained in the biaxially oriented film layer 101 as measured by DSC is preferably 125°C or higher, more preferably 130°C or higher, and even more preferably 135°C or higher, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, and is preferably 150°C or lower, more preferably 148°C or lower, and even more preferably 145°C or lower, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment.
  • the melting point of the random copolymer is the peak temperature of the maximum melting peak.
  • the weight average molecular weight (Mw) of the random copolymer of propylene and an ⁇ -olefin having 2 to 10 carbon atoms (however, ⁇ -olefins exclude propylene) contained in the biaxially oriented film layer 101 is preferably 100,000 or more, more preferably 150,000 or more, and even more preferably 200,000 or more, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, further improving the formability of the packaging film 100, and further improving the sheet unwindability.
  • 0 or more, more preferably 250,000 or more, and even more preferably 300,000 or more, and from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort processing, further improving the formability of the packaging film 100, and further improving the payout properties of the sheet it is preferably 1,000,000 or less, more preferably 800,000 or less, more preferably 600,000 or less, even more preferably 500,000 or less, and even more preferably 450,000 or less.
  • the weight average molecular weight (Mw)/number average molecular weight (Mn) of the random copolymer of propylene and an ⁇ -olefin having 2 to 10 carbon atoms (wherein the ⁇ -olefin is excluding propylene) contained in the biaxially oriented film layer 101 is preferably 1.5 or more, more preferably 1.8 or more, from the viewpoints of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, further improving the formability of the packaging film 100, and further improving the sheet payout ability; and from the viewpoints of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, further improving the formability of the packaging film 100, and further improving the sheet payout ability, is preferably 8.0 or less, more preferably 7.5 or less, even more preferably 7.0 or less, and even more preferably 6.8 or less.
  • the weight average molecular weight (Mw) and number average molecular weight (Mn) of the random copolymer can be the weight average molecular weight (Mw) and number average molecular weight (Mn) of a mixture obtained by melt blending two or more types of random copolymers by a known method.
  • weight average molecular weight (Mw) and number average molecular weight (Mn) are values measured by the method described in the Examples.
  • Random copolymers of propylene and ⁇ -olefins having 2 to 10 carbon atoms can be produced by various methods. For example, they can be produced using known catalysts such as Ziegler-Natta catalysts and metallocene catalysts.
  • the propylene-based polymer composition constituting the biaxially stretched film layer 101 may contain various additives such as tackifiers, heat stabilizers, weather stabilizers, antioxidants, UV absorbers, lubricants, slip agents, nucleating agents, antiblocking agents, antistatic agents, antifogging agents, pigments, dyes, and inorganic or organic fillers, as necessary, to the extent that the purpose of this embodiment is not impaired.
  • additives such as tackifiers, heat stabilizers, weather stabilizers, antioxidants, UV absorbers, lubricants, slip agents, nucleating agents, antiblocking agents, antistatic agents, antifogging agents, pigments, dyes, and inorganic or organic fillers, as necessary, to the extent that the purpose of this embodiment is not impaired.
  • the propylene-based polymer composition constituting the biaxially stretched film layer 101 can be prepared by mixing or melting and kneading each component using a dry blend, a tumbler mixer, a Banbury mixer, a single-screw extruder, a twin-screw extruder, a high-speed twin-screw extruder, a heat roll, or the like.
  • the packaging film 100 of this embodiment has a surface layer (A) 103 on at least one surface of a biaxially oriented film layer 101 .
  • the surface layer (A) 103 is preferably provided on the outermost layer of the packaging film 100 from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment.
  • the surface layer (A) 103 is preferably provided so as to be in direct contact with the surface of the biaxially stretched film layer 101. This simplifies the manufacturing process of the packaging film 100.
  • the thickness of the surface layer (A) 103 is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more, even more preferably 0.5 ⁇ m or more, and even more preferably 0.8 ⁇ m or more, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, and is preferably 10.0 ⁇ m or less, more preferably 8.0 ⁇ m or less, even more preferably 6.0 ⁇ m or less, even more preferably 5.0 ⁇ m or less, and even more preferably 4.0 ⁇ m or less, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment.
  • the surface layer (A) 103 is a single layer. This can further simplify the manufacturing process of the packaging film 100.
  • the surface layer (A) 103 is preferably formed by biaxially stretching at the same time as the biaxially stretched film layer 101, which is in a state before biaxial stretching. This allows the packaging film 100 to be produced using a molding method such as co-extrusion molding, i.e., a laminated film produced in a single molding operation, thereby further simplifying the manufacturing process of the packaging film 100. Therefore, it is preferable that the surface layer (A) 103 is biaxially stretched.
  • the surface layer (A) 103 may be subjected to a surface treatment. Specifically, it may be subjected to a surface activation treatment such as corona treatment, flame treatment, plasma treatment, primer coat treatment, ozone treatment, etc. It is preferable that the surface layer (A) 103 is subjected to a corona treatment from the viewpoint of further improving the performance balance of the lamination strength, heat seal strength, and bag tear resistance of the packaging material after high retort treatment.
  • a surface activation treatment such as corona treatment, flame treatment, plasma treatment, primer coat treatment, ozone treatment, etc. It is preferable that the surface layer (A) 103 is subjected to a corona treatment from the viewpoint of further improving the performance balance of the lamination strength, heat seal strength, and bag tear resistance of the packaging material after high retort treatment.
  • the surface layer (A) 103 is made of a polyolefin-based resin composition containing a polyolefin.
  • the polyolefin constituting the surface layer (A) 103 includes at least one selected from the group consisting of homopolymers or copolymers of ⁇ -olefins such as ethylene, propylene, 1-butene, hexene-1, 4-methyl-pentene-1, and 1-octene; high-pressure low-density polyethylene; linear low-density polyethylene (LLDPE); high-density polyethylene; homopolypropylene; random copolymers of propylene and ⁇ -olefins having 2 to 10 carbon atoms; ethylene-vinyl acetate copolymers (EVA); and ionomer resins.
  • ⁇ -olefins such as ethylene, propylene, 1-butene, hexene-1, 4-methyl-pentene-1, and 1-octene
  • the polyolefin constituting the surface layer (A) 103 preferably contains at least one selected from the group consisting of a block copolymer of propylene, a copolymer of propylene and ethylene, and a copolymer of ethylene and butene, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, more preferably contains at least one selected from the group consisting of a block copolymer of propylene and an ⁇ -olefin having 2 to 10 carbon atoms (however, the ⁇ -olefin excludes propylene), a copolymer of propylene and ethylene, and a copolymer of ethylene and butene, and even more preferably contains at least one selected from the group consisting of a block copolymer of propylene and an ⁇ -olefin having 2 to 6 carbon atoms (however, the ⁇ -olefin excludes propy
  • the content of structural units derived from ⁇ -olefins having 2 to 10 carbon atoms ( ⁇ -olefins excluding propylene) contained in the surface layer (A) 103 is, when the total number of moles of structural units derived from all monomers contained in the surface layer (A) 103 is taken as 100 mol%, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, preferably 1.0 mol% or more, more preferably 2.0 mol% or more, even more preferably 3.0 mol% or more, even more preferably 5.0 mol% or more, even more preferably 10.0 mol% or more, even more preferably 15.0 mol% or more, even more preferably 20.0 mol% or more, and from the viewpoint of making the packaging material into a mono-material, preferably 50.0 mol% or less, more preferably 40.0 mol% or less, even more preferably 35.0 mol% or less, even more preferably 32.0 mol%
  • the total content of polyolefins selected from the group consisting of propylene block copolymers, propylene and ethylene copolymers, and ethylene and butene copolymers in the surface layer (A) 103 is preferably 5% by mass or more, more preferably 10% by mass or more, and even more preferably 15% by mass or more, when the total amount of all components contained in the surface layer (A) 103 is taken as 100% by mass, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after the high retort treatment, and is preferably 100% by mass or less, more preferably 90% by mass or less, and even more preferably 85% by mass or less, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after the high retort treatment.
  • the polyolefin resin composition constituting the surface layer (A) 103 may contain various additives such as tackifiers, heat stabilizers, weather stabilizers, antioxidants, UV absorbers, lubricants, slip agents, nucleating agents, antiblocking agents, antistatic agents, antifogging agents, pigments, dyes, and inorganic or organic fillers, as necessary, to the extent that the purpose of this embodiment is not impaired.
  • additives such as tackifiers, heat stabilizers, weather stabilizers, antioxidants, UV absorbers, lubricants, slip agents, nucleating agents, antiblocking agents, antistatic agents, antifogging agents, pigments, dyes, and inorganic or organic fillers, as necessary, to the extent that the purpose of this embodiment is not impaired.
  • the polyolefin resin composition constituting the surface layer (A) 103 can be prepared, for example, by mixing or melting and kneading each component using a dry blend, a tumbler mixer, a Banbury mixer, a single-screw extruder, a twin-screw extruder, a high-speed twin-screw extruder, a heat roll, or the like.
  • the arithmetic mean roughness (Ra) of at least one surface of the surface layer (A) 103, measured by a three-dimensional surface measuring machine in accordance with JIS B0601 (1994), is preferably 40 nm or more, more preferably 45 nm or more, and even more preferably 50 nm or more, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, and is preferably 750 nm or less, more preferably 700 nm or less, and even more preferably 650 nm or less, from the viewpoint of further improving the transparency of the packaging material.
  • the ten-point average roughness (Rz) of at least one surface of the surface layer (A) 103 is preferably 600 nm or more, more preferably 650 nm or more, and even more preferably 680 nm or more, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag rupture resistance of the packaging material after high retort treatment, and is preferably 5500 nm or less, more preferably 5300 nm or less, and even more preferably 5100 nm or less, from the viewpoint of further improving the transparency of the packaging material.
  • the packaging film 100 further comprises a surface layer (B) 105 on the side opposite to the surface layer (A) 103 of the biaxially oriented film layer 101.
  • the surface layer (B) 105 is preferably provided as the outermost layer of the packaging film 100 in order to further improve the functions of the packaging film 100, such as heat resistance, heat sealability, antistatic properties, blocking resistance, printability, slip properties, etc., depending on the purpose.
  • the surface layer (B) 105 is preferably provided so as to be in direct contact with the surface of the biaxially stretched film layer 101. This simplifies the manufacturing process of the packaging film 100.
  • the thickness of the surface layer (B) 105 is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more, even more preferably 0.5 ⁇ m or more, even more preferably 1.0 ⁇ m or more, and even more preferably 1.5 ⁇ m or more, from the viewpoint of further improving the functions of the packaging film 100 such as heat fusion resistance, heat sealability, antistatic properties, blocking resistance, printability, and slippage, and is preferably 10.0 ⁇ m or less, more preferably 8.0 ⁇ m or less, even more preferably 6.0 ⁇ m or less, even more preferably 5.0 ⁇ m or less, and even more preferably 3.0 ⁇ m or less, from the viewpoint of further improving the balance of the packaging film 100's heat fusion resistance, thermal dimensional stability, formability, cost, mechanical properties, transparency, environmental compatibility, and light weight.
  • the surface layer (B) 105 is a single layer. This can further simplify the manufacturing process of the packaging film 100.
  • the surface layer (B) 105 is preferably formed by biaxially stretching at the same time as the biaxially stretched film layer 101 in a state before biaxial stretching. This allows the packaging film 100 to be produced using a molding method such as co-extrusion molding, i.e., a laminated film produced in a single molding operation, thereby further simplifying the manufacturing process of the packaging film 100. Therefore, it is preferable that the surface layer (B) 105 is biaxially stretched.
  • the surface layer (B) 105 may be subjected to a surface treatment. Specifically, a surface activation treatment such as corona treatment, flame treatment, plasma treatment, primer coating treatment, or ozone treatment may be performed.
  • a surface activation treatment such as corona treatment, flame treatment, plasma treatment, primer coating treatment, or ozone treatment may be performed.
  • the surface layer (B) 105 is made of a polyolefin-based resin composition containing a polyolefin.
  • the polyolefin constituting the surface layer (B) 105 includes at least one selected from the group consisting of homopolymers or copolymers of ⁇ -olefins such as ethylene, propylene, 1-butene, hexene-1, 4-methyl-pentene-1, and 1-octene; high-pressure low-density polyethylene; linear low-density polyethylene (LLDPE); high-density polyethylene; homopolypropylene; random copolymers of propylene and ⁇ -olefins having 2 to 10 carbon atoms; ethylene-vinyl acetate copolymers (EVA); and ionomer resins.
  • ⁇ -olefins such as ethylene, propylene, 1-butene, hexene-1, 4-methyl-pentene-1, and 1-octene
  • homopolypropylene is preferred as the polyolefin constituting the surface layer (B) 105 from the viewpoint of further improving the balance of heat fusion resistance, thermal dimensional stability, heat resistance, water vapor barrier property, transparency, mechanical properties, rigidity, bag formability, fluidity, moldability, etc. of the packaging film 100.
  • the preferred embodiment of the homopolypropylene constituting the surface layer (B) 105 is the same as the homopolypropylene contained in the biaxially oriented film layer 101 described above.
  • the content of homopolypropylene in the surface layer (B) 105 when the total amount of all components contained in the surface layer (B) 105 is taken as 100% by mass, is preferably 75% by mass or more, more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, even more preferably 99% by mass or more, and preferably 100% by mass or less, from the viewpoint of further improving the balance of the heat fusion resistance, thermal dimensional stability, heat resistance, water vapor barrier property, transparency, mechanical properties, rigidity, bag formability, fluidity, moldability, etc. of the packaging film 100.
  • various additives such as a tackifier, a heat stabilizer, a weather stabilizer, an antioxidant, an ultraviolet absorber, a lubricant, a slipping agent, a nucleating agent, an antiblocking agent, an antistatic agent, an antifogging agent, a pigment, a dye, and an inorganic or organic filler may be added to the polyolefin resin composition constituting the surface layer (B) 105, within a range that does not impair the object of this embodiment.
  • the polyolefin resin composition constituting the surface layer (B) 105 preferably contains an antiblocking agent from the viewpoint of further improving the handling properties during production of the packaging film 100 .
  • the polyolefin resin composition constituting the surface layer (B) 105 can be prepared, for example, by mixing or melting and kneading each component using a dry blend, a tumbler mixer, a Banbury mixer, a single-screw extruder, a twin-screw extruder, a high-speed twin-screw extruder, a heat roll, or the like.
  • the packaging film 100 may further include a sealant layer.
  • a sealant layer may be provided on the surface of the surface layer (B) 105 .
  • the packaging film 100 can be obtained, for example, by co-extrusion molding a propylene-based polymer composition for forming the biaxially oriented film layer 101 and a polyolefin-based resin composition for forming the surface layer (A) 103 into a film, and then biaxially stretching the film obtained by the co-extrusion molding using a known biaxially oriented film production method such as a simultaneous biaxial stretching method, a sequential biaxial stretching method, or an inflation biaxial stretching method.
  • the molding device and molding conditions are not particularly limited, and conventionally known molding devices and molding conditions can be adopted.
  • the molding device a T-die extruder, a multi-layer T-die extruder, an inflation molding machine, a multi-layer inflation molding machine, or the like can be used.
  • the biaxial stretching conditions for example, known OPP film manufacturing conditions can be adopted. More specifically, in the sequential biaxial stretching method, for example, the stretching temperature in the MD direction may be set to 100°C to 145°C, the stretching ratio in the MD direction may be set to a range of 4.5 to 6 times, the stretching temperature in the TD direction may be set to 130°C to 190°C, and the stretching ratio in the TD direction may be set to a range of 9 to 11 times.
  • the packaging film 100 can also be obtained by separately forming the biaxially oriented film layer 101 and the surface layer (A) 103, laminating them together, and subjecting them to heat forming.
  • the packaging film 100 can be suitably used as a packaging film constituting a packaging material for food, and is more preferably used as a packaging film constituting a packaging material for retort food.
  • the packaging material of this embodiment is a packaging material using the packaging film 100 of this embodiment, and is, for example, a packaging material used for the purpose of containing food. Furthermore, the packaging material according to this embodiment may use the packaging film 100 in a part thereof or the packaging film 100 may be used in the entire packaging material depending on the application.
  • the packaging material of this embodiment is preferably retort treated (e.g., at 127°C to 132°C for 20 minutes to 40 minutes), and more preferably high retort treated (e.g., at 133°C to 138°C for 20 minutes to 40 minutes).
  • the packaging material of this embodiment is manufactured, for example, by bonding the packaging film 100 of this embodiment with a sealant film for lamination or the like and processing it into a bag shape. If the packaging film 100 has a sealant layer, the packaging material of this embodiment can also be manufactured by bonding the ends of the sealant layer together to form a bag shape.
  • the food package of the present embodiment includes the packaging material of the present embodiment and food contained in the packaging material. That is, the food package of the present embodiment is the food package of the present embodiment that contains food.
  • h-PP1 Homopolypropylene (MFR: 3.0 g/10 min, melting point: 165° C., isotactic mesopentad fraction (mmmm): 98.0%, Mw: 370,000, Mn: 68,000, Mw/Mn: 5.4, content of propylene-derived structural units: 100 mol%)
  • h-PP2 homopolypropylene (MFR: 3.0 g/10 min, melting point: 159°C, isotactic mesopentad fraction (mmmm): 97.5%, Mw: 469,000, Mn: 56,300, Mw/Mn: 8.3, content of ethylene-derived structural units: 1.2 mol%, content of propylene-derived structural units: 98.8 mol%)
  • Copolymer r-PP1 Random polypropylene (MFR: 7.0 g/10 min, melting point: 139
  • Measurement nucleus 13C (125MHz) Measurement mode: Single pulse proton broadband decoupling Pulse width: 45° Number of points: 64k Repeat time: 5.5 seconds Measurement solvent: orthodichlorobenzene/heavy benzene (4:1) Sample concentration: 50 mg/0.6 mL Measurement temperature: 120°C Window function: exponential (BF: 0.5 Hz)
  • Weight average molecular weight (Mw) and number average molecular weight (Mn) of homopolypropylene and copolymer were measured by gel permeation chromatography (GPC).
  • the GPC method was performed using a gel permeation chromatograph (Tosoh Corporation, HLC-8321 GPC/HT type) as follows.
  • the separation columns were two TSKgel GNH6-HT and two TSKgel GNH6-HTL, each with a diameter of 7.5 mm and a length of 300 mm, the column temperature was 145° C., the mobile phase was o-dichlorobenzene and 0.025 mass% BHT as an antioxidant, and the flow rate was 1.0 mL/min, the sample concentration was 0.1% (w/v), the sample injection amount was 400 ⁇ L, and a differential refractometer was used as a detector.
  • the molecular weight was calculated as polypropylene equivalent molecular weight using monodisperse polystyrene as a standard.
  • Isotactic mesopentad fraction of homopropylene was measured by 13 C-NMR using a nuclear magnetic resonance apparatus (AVANCE III cryo-500 model, manufactured by Bruker Biospin). The sample was dissolved in the following measurement solvent and the measurement was performed, and the isotactic mesopentad fraction (mmmm) was evaluated from the integrated intensity of each signal.
  • AVANCE III cryo-500 model manufactured by Bruker Biospin
  • Measurement nucleus 13C (125MHz) Measurement mode: Single pulse proton broadband decoupling Pulse width: 45° Number of points: 64k Repeat time: 5.5 seconds Measurement solvent: orthodichlorobenzene/heavy benzene (4:1) Sample concentration: 50 mg/0.6 mL Measurement temperature: 120°C Window function: exponential (BF: 0.5 Hz) Chemical shift reference: mmmm (CH 3 ): 21.59 ppm
  • the thickness of the packaging film was measured using a micrometer (manufactured by Hybrid Manufacturing Co., Ltd., product name: Automatic Micrometer). The thickness was measured at five points inside the packaging film, and the average value was regarded as the actual thickness of the packaging film.
  • the two-component curing polyurethane adhesive used was a mixture of 9.0 parts by mass of a urethane resin (manufactured by Mitsui Chemicals, Inc., product name: Takelac A525S), 1.0 part by mass of an isocyanate curing agent (manufactured by Mitsui Chemicals, Inc., product name: Takenate A50), and 7.5 parts by mass of ethyl acetate.
  • thermal expansion coefficient and thermal shrinkage coefficient of packaging film at 120 ° C were measured in accordance with JIS C2151 (2019).
  • a test piece of 10 cm x 10 cm was cut out from the packaging film.
  • the test piece was then heat-treated at 120°C for 15 minutes.
  • the test piece was heated in a hot air circulation type thermostatic chamber (manufactured by ADVANTEC, product name: DRM620DE) while hanging without applying force.
  • the test piece was then cooled to room temperature, and the length of the test piece was measured.
  • the length in the TD direction of the test piece after the heat treatment was taken as TD 1 [cm]
  • the thermal expansion coefficient in the TD direction [%] was calculated by 100 ⁇ (TD 1 - 10) / 10.
  • the length in the MD direction of the test piece after the heat treatment was taken as MD 1 [cm]
  • the thermal shrinkage coefficient in the MD direction [%] was calculated by 100 ⁇ (10 - MD 1 ) / 10. The above measurement was carried out three times, and the average value was calculated as the measured value.
  • Heat shrinkage rate of packaging film at 150 ° C. was measured in accordance with JIS C2151 (2019). First, a test piece of 10 cm x 10 cm was cut out from the packaging film. The test piece was then heat-treated at 150°C for 15 minutes. At this time, the test piece was heated in a hot air circulation type thermostatic chamber (manufactured by ADVANTEC, product name: DRM620DE) while hanging without applying force. The test piece was then cooled to room temperature, and the length of the test piece was measured.
  • a hot air circulation type thermostatic chamber manufactured by ADVANTEC, product name: DRM620DE
  • Measurement length MD direction: 400 ⁇ m
  • TD direction 1000 ⁇ m
  • Number of lines measured TD direction
  • Number of lines 201
  • Measurement pitch MD direction: 0.5 ⁇ m
  • TD direction 2 ⁇ m
  • Z measurement magnification 5000
  • Leveling least squares method
  • Z origin zero point alignment using least squares method
  • Stylus tip curvature radius 2.0 ⁇ m/60° C.
  • Analysis software Built-in "3D surface roughness analysis program"
  • the adhesive used was a two-component curing polyurethane adhesive (a mixture of 9.0 parts by mass of a urethane resin (manufactured by Mitsui Chemicals, product name: Takelac A525S), 1.0 part by mass of an isocyanate curing agent (manufactured by Mitsui Chemicals, product name: Takenate A50), and 7.5 parts by mass of ethyl acetate).
  • a two-component curing polyurethane adhesive a mixture of 9.0 parts by mass of a urethane resin (manufactured by Mitsui Chemicals, product name: Takelac A525S), 1.0 part by mass of an isocyanate curing agent (manufactured by Mitsui Chemicals, product name: Takenate A50), and 7.5 parts by mass of ethyl acetate).
  • the length in the MD direction of the test piece after the high retort treatment was taken as MD 1 [cm]
  • the thermal shrinkage coefficient in the MD direction [%] was calculated by 100 x (10 - MD 1 )/10.
  • Samples with a thermal expansion coefficient [%] in the TD direction of 0.0% or more were rated as good.
  • the packaging film after the high retort treatment obtained in (13) was visually observed and evaluated as follows. A (good): The packaging film is free of wrinkles and distortion. B (bad): The packaging film had wrinkles or other imperfections, and distortion was observed.
  • the samples with a heat seal strength of 25 N/15 mm or more were rated as good.
  • the heat seal strength of the samples with a heat seal strength of 25 N/15 mm or more is equivalent to the heat seal strength of packaging films using polyethylene terephthalate (PET).
  • the packaging film after high retort treatment obtained in (13) was stacked with the non-oriented polypropylene film side on the inside so that the MD/TD were aligned, and processed into a three-sided sealed bag with a length (MD direction) of 175 mm x width (TD direction) of 125 mm and a seal width of 10 mm.
  • This three-sided sealed bag was filled with 200 mL of water, sealed, and left to stand in a 5°C atmosphere for 24 hours or more. In the same atmosphere, the bag was dropped from a height of 30 cm from a surface part to which a 1 kg weight of the same size as the bag size was attached, so that the horizontal direction was the drop direction. The bag was repeatedly dropped until it broke, and the number of times it broke was measured. The above measurement was repeated five times, and the average value was taken as the number of times the bag was dropped. Samples with six or more dropped bags were rated as good.
  • the relaxation rate refers to the maximum stretching ratio width in the device settings divided by the tenter exit width.
  • the notation "A/B/C" for the stretching temperature in Table 1 means "preheating temperature (temperature for heating the original film before stretching)/stretching temperature (temperature during stretching)/heat setting temperature (temperature during heat setting (annealing) after stretching)".
  • the packaging film of the example was evaluated as being good in both the thermal dimensional stability and the number of bag drops of the sample after high retort treatment. Furthermore, the packaging film of the example was also evaluated as being good in the lamination strength and heat seal strength. In other words, it can be seen that the packaging material using the packaging film of this embodiment improves the performance balance of the thermal dimensional stability and bag tear resistance of the packaging material after high retort treatment.
  • Packaging film 101 Biaxially stretched film layer 103 Surface layer (A) 105 Surface layer (B)

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  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)

Abstract

Ce film d'emballage (100) comprend : une couche de film étiré biaxialement (101) contenant de l'homopolypropylène ; et une couche de surface (A) (103) disposée sur au moins une surface de la couche de film étiré biaxialement (101), lorsque le nombre molaire total de toutes les unités constitutives dérivées de monomère contenues dans le film d'emballage (100) est de 100 % en moles, la teneur en unités constitutives dérivées d'α-oléfines en C2-C10 (les α-oléfines excluant le propylène) est de 1,5 à 20,0 % en moles.
PCT/JP2023/034336 2022-09-28 2023-09-21 Film d'emballage, matériau d'emballage et emballage alimentaire WO2024070894A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000230088A (ja) * 1998-12-07 2000-08-22 Mitsui Chemicals Inc 加熱滅菌用中空容器
JP2015044406A (ja) * 2013-07-23 2015-03-12 東洋紡株式会社 ポリプロピレン積層延伸フィルム
JP2019006461A (ja) * 2017-06-26 2019-01-17 三井化学東セロ株式会社 食品用包装フィルムおよび食品用包装体
JP2020007441A (ja) * 2018-07-06 2020-01-16 三井化学東セロ株式会社 食品用包装フィルムおよび食品用包装体
WO2022138622A1 (fr) * 2020-12-23 2022-06-30 三井化学東セロ株式会社 Film multicouche

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000230088A (ja) * 1998-12-07 2000-08-22 Mitsui Chemicals Inc 加熱滅菌用中空容器
JP2015044406A (ja) * 2013-07-23 2015-03-12 東洋紡株式会社 ポリプロピレン積層延伸フィルム
JP2019006461A (ja) * 2017-06-26 2019-01-17 三井化学東セロ株式会社 食品用包装フィルムおよび食品用包装体
JP2020007441A (ja) * 2018-07-06 2020-01-16 三井化学東セロ株式会社 食品用包装フィルムおよび食品用包装体
WO2022138622A1 (fr) * 2020-12-23 2022-06-30 三井化学東セロ株式会社 Film multicouche

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