WO2024070972A1 - Film de polypropylène à orientation biaxiale, emballage pour aliment et emballage alimentaire - Google Patents

Film de polypropylène à orientation biaxiale, emballage pour aliment et emballage alimentaire Download PDF

Info

Publication number
WO2024070972A1
WO2024070972A1 PCT/JP2023/034574 JP2023034574W WO2024070972A1 WO 2024070972 A1 WO2024070972 A1 WO 2024070972A1 JP 2023034574 W JP2023034574 W JP 2023034574W WO 2024070972 A1 WO2024070972 A1 WO 2024070972A1
Authority
WO
WIPO (PCT)
Prior art keywords
biaxially oriented
polypropylene film
oriented polypropylene
less
film according
Prior art date
Application number
PCT/JP2023/034574
Other languages
English (en)
Japanese (ja)
Inventor
拓也 田村
裕之 若木
琢巳 正本
正之 櫻井
Original Assignee
三井化学東セロ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2022155359A external-priority patent/JP2024049096A/ja
Priority claimed from JP2022155372A external-priority patent/JP2024049107A/ja
Priority claimed from JP2022155365A external-priority patent/JP2024049102A/ja
Priority claimed from JP2022155360A external-priority patent/JP2024049097A/ja
Priority claimed from JP2022155368A external-priority patent/JP2024049105A/ja
Application filed by 三井化学東セロ株式会社 filed Critical 三井化学東セロ株式会社
Publication of WO2024070972A1 publication Critical patent/WO2024070972A1/fr

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • 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
    • 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
    • B65D65/02—Wrappers or flexible covers
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene

Definitions

  • the present invention relates to a biaxially oriented polypropylene film, a food package, and a food package.
  • 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. 2008-73926
  • Patent Document 2 JP Patent Publication No. 2004-82499
  • Patent Document 1 describes a biaxially oriented multilayer polypropylene film comprising a biaxially oriented film made of a propylene polymer composition containing 75 to 90 mass % of a propylene homopolymer (A) and 25 to 10 mass % of a tackifier (D), the biaxially oriented film having a layer made of a propylene- ⁇ -olefin random copolymer (C) having a melting point in the range of 125 to 145° C., via a layer made of a propylene polymer (B) having a melting point of 155° C. or higher, on one side thereof, and a layer made of a propylene polymer (E) on the other side thereof.
  • Patent Document 1 describes that the biaxially oriented multilayer polypropylene film can suppress the seepage of petroleum resins and the like onto the film surface, and has excellent lamination strength and moisture resistance.
  • Patent Document 2 describes a multilayer resin film having a biaxially oriented polypropylene resin layer containing 10 to 40% by mass of a highly crystallized resin and 6 to 15% by mass of a petroleum resin, and further having a polyvinyl alcohol resin layer via an adhesive layer on at least one surface of the biaxially oriented polypropylene resin layer, the multilayer resin film being characterized in that the oxygen transmission rate at a relative humidity of 85% RH and a temperature of 23°C is 600 mL/ m2 day MPa or less, and the water vapor transmission rate at a relative humidity of 90% RH and a temperature of 40°C is 3.5 g/ m2 day 20 ⁇ m or less.
  • Patent Document 2 describes that the multilayer resin film has excellent oxygen gas barrier properties and moisture resistance.
  • the present invention was made in consideration of the above circumstances, and provides a biaxially oriented polypropylene film, food packaging material, and food packaging material with improved thermal dimensional stability.
  • the inventors conducted extensive research to solve the above problems. As a result, they discovered that the thermal dimensional stability of biaxially oriented polypropylene film can be improved by adjusting the crystallinity ratio at 165°C or less to a specific range, which led to the present invention.
  • the present invention provides the biaxially oriented polypropylene film, food packaging material, and food packaging material shown below.
  • a biaxially stretched film layer containing a propylene-based polymer is provided, A biaxially oriented polypropylene film having a crystallinity of 38% or more at 165°C or less as determined by differential scanning calorimetry.
  • biaxially oriented polypropylene film is 20% or more as determined by differential scanning calorimetry.
  • the content of the homopolypropylene (A) in the surface resin layer is 75% by mass or more and 100% by mass or less, when the entire surface resin layer is 100% by mass.
  • the present invention provides a biaxially oriented polypropylene film, food packaging material, and food packaging material with improved thermal dimensional stability.
  • FIG. 1 is a cross-sectional view showing a schematic example of the structure of a biaxially oriented polypropylene film according to the present embodiment.
  • FIG. 1 is a cross-sectional view showing a schematic example of the structure of a biaxially oriented polypropylene film according to the present embodiment.
  • FIG. 1 is a cross-sectional view showing a schematic example of the structure of a biaxially oriented polypropylene film according to the present embodiment.
  • ⁇ Biaxially oriented polypropylene film> 1 to 3 are cross-sectional views each showing a schematic example of the structure of a biaxially oriented polypropylene film 100 according to the present embodiment.
  • the biaxially oriented polypropylene film 100 of this embodiment includes a biaxially oriented film layer 101 containing a propylene-based polymer, and has a crystal ratio at 165° C. or less of 38% or more as determined by differential scanning calorimetry.
  • thermo dimensional stability of biaxially oriented polypropylene films is required from the viewpoint of suppressing thermal wrinkles in the sealed portions during bag making and from the viewpoint of suppressing thermal elongation during vapor deposition and coating processes.
  • the inventors have found that the amount of crystalline components at 165° C. or less affects the thermal dimensional stability.
  • the thermal dimensional stability of the biaxially oriented polypropylene film 100 can be improved by making the crystalline ratio at 165° C. or less 38% or more, and have arrived at the present invention. That is, according to the biaxially oriented polypropylene film 100 of the present embodiment, the thermal dimensional stability can be improved.
  • the biaxially oriented polypropylene film 100 of this embodiment has improved thermal dimensional stability, it is possible to suppress thermal wrinkles in the sealed portions during bag making, thereby improving bag making properties.
  • the crystal ratio of the biaxially oriented polypropylene film 100 at 165°C or less, as determined by differential scanning calorimetry, is 38% or more, but from the viewpoint of further improving the thermal dimensional stability of the biaxially oriented polypropylene film 100, it is preferably 39% or more, more preferably 40% or more, even more preferably 41% or more, even more preferably 42% or more, and even more preferably 43% or more, and from the viewpoint of further improving the performance balance of the formability and thermal dimensional stability of the biaxially oriented polypropylene film 100, it is preferably 70% or less, more preferably 65% or less, even more preferably 60% or less, even more preferably 55% or less, and even more preferably 50% or less.
  • the crystal ratio of the biaxially oriented polypropylene film 100 at 165° C. or less can be measured by the method described in the examples.
  • the main melting point of the biaxially oriented polypropylene film 100 is preferably 165°C or higher, more preferably 168°C or higher, and even more preferably 170°C or higher, from the viewpoint of further improving the thermal dimensional stability of the biaxially oriented polypropylene film 100, and is preferably 180°C or lower, more preferably 178°C or lower, even more preferably 175°C or lower, and even more preferably 173°C or lower, from the viewpoint of further improving the performance balance of the formability and thermal dimensional stability of the biaxially oriented polypropylene film 100.
  • the main melting point of the biaxially stretched polypropylene film 100 can be measured by the method described in the Examples.
  • the peak temperature of the maximum melting peak in the DSC curve is defined as the main melting point.
  • the heat of fusion ( ⁇ H) of the entire biaxially oriented polypropylene film 100 is preferably 100 J/g or more, more preferably 105 J/g or more, even more preferably 110 J/g or more, even more preferably 113 J/g or more, even more preferably 115 J/g or more, and even more preferably 117 J/g or more, from the viewpoint of further improving the thermal dimensional stability of the biaxially oriented polypropylene film 100, and is preferably 150 J/g or less, more preferably 140 J/g or less, even more preferably 130 J/g or less, and even more preferably 128 J/g or less, from the viewpoint of further improving the performance balance of the formability and thermal dimensional stability of the biaxially oriented polypropylene film 100.
  • the heat of fusion ( ⁇ H) of the entire biaxially stretched polypropylene film 100 can be measured by the method described in the Examples.
  • the total area of the multiple melting peaks is defined as the heat of fusion ( ⁇ H).
  • the heat of fusion ( ⁇ H) of the biaxially oriented polypropylene film 100 at 165° C. or less, as determined by differential scanning calorimetry, is preferably 40 J/g or more, more preferably 42 J/g or more, even more preferably 43 J/g or more, even more preferably 45 J/g or more, even more preferably 48 J/g or more, and even more preferably 50 J/g or more, from the viewpoint of further improving the thermal dimensional stability of the biaxially oriented polypropylene film 100, and is preferably 90 J/g or less, more preferably 85 J/g or less, even more preferably 80 J/g or less, even more preferably 75 J/g or less, even more preferably 70 J/g or less, even more preferably 65 J/g or less, and even more preferably 60 J/g or less, from the viewpoint of further improving the performance balance of the formability and thermal dimensional stability of the biaxially oriented polypropylene film 100.
  • the crystallinity of the biaxially oriented polypropylene film 100 is preferably 40% or more, more preferably 45% or more, even more preferably 50% or more, even more preferably 53% or more, and even more preferably 55% or more, from the viewpoint of further improving the thermal dimensional stability of the biaxially oriented polypropylene film 100, and is preferably 80% or less, more preferably 75% or less, even more preferably 70% or less, even more preferably 65% or less, even more preferably 62% or less, and even more preferably 60% or less, from the viewpoint of further improving the performance balance of the formability and thermal dimensional stability of the biaxially oriented polypropylene film 100.
  • the crystallinity of the biaxially oriented polypropylene film 100 can be measured by the method described in the Examples.
  • the crystal content of the biaxially oriented polypropylene film 100 at 165°C or less, as determined by differential scanning calorimetry, is preferably 20% or more, more preferably 22% or more, even more preferably 23% or more, and even more preferably 24% or more, from the viewpoint of further improving the thermal dimensional stability of the biaxially oriented polypropylene film 100, and is preferably 40% or less, more preferably 38% or less, even more preferably 36% or less, preferably 35% or less, and even more preferably 30% or less, from the viewpoint of further improving the performance balance of the formability and thermal dimensional stability of the biaxially oriented polypropylene film 100.
  • the amount of crystallinity of the biaxially oriented polypropylene film 100 at 165° C. or less can be measured by the method described in the examples.
  • the above-mentioned characteristics of the biaxially oriented polypropylene film 100 which are determined by differential scanning calorimetry, can be adjusted, for example, by adjusting the type and content of the propylene-based polymer contained in the biaxially oriented film layer 101, the thickness and stretching ratio of the biaxially oriented film layer 101, the constituent material and thickness of the surface resin layer 103, etc.
  • the crystal long period S2 in the TD direction of the biaxially oriented polypropylene film 100 determined by small angle X-ray scattering (SAXS) measurement is preferably 28.0 nm or less from the viewpoint of further improving the thermal dimensional stability of the biaxially oriented polypropylene film 100.
  • SAXS small angle X-ray scattering
  • the thermal dimensional stability of the biaxially stretched polypropylene film 100 can be improved by setting the crystal long period S2 in the TD direction determined by SAXS measurement to 28.0 nm or less. That is, according to the biaxially stretched polypropylene film 100 of this embodiment, in which the crystal long period S2 in the TD direction determined by SAXS measurement is 28.0 nm or less, the thermal dimensional stability can be further improved. In addition, since such a biaxially oriented polypropylene film 100 has improved thermal dimensional stability, it is possible to suppress thermal wrinkles in the sealed portions during bag making, thereby further improving bag making properties.
  • the crystal long period S2 in the TD direction of the biaxially oriented polypropylene film 100 determined by SAXS measurement is preferably 28.0 nm or less, but from the viewpoint of further improving the thermal dimensional stability of the biaxially oriented polypropylene film 100, it is more preferably 27.8 nm or less, even more preferably 27.6 nm or less, even more preferably 27.0 nm or less, even more preferably 25.0 nm or less, even more preferably 23.0 nm or less, even more preferably 20.0 nm or less, even more preferably 18.0 nm or less, and even more preferably 15.0 nm or less, and from the viewpoint of further improving the performance balance of the transparency and water vapor barrier property of the biaxially oriented polypropylene film 100, it is preferably 5.0 nm or more, more preferably 8.0 nm or more, even more preferably 10.0 nm or more, even more preferably 12.0 nm or more, even more preferably 15.0
  • the crystal long period S1 in the MD direction of the biaxially oriented polypropylene film 100 determined by SAXS measurement is, from the viewpoint of further improving the thermal dimensional stability of the biaxially oriented polypropylene film 100, preferably 16.5 nm or less, more preferably 16.0 nm or less, even more preferably 15.8 nm or less, and even more preferably 15.5 nm or less, and from the viewpoint of further improving the performance balance of the transparency and water vapor barrier property of the biaxially oriented polypropylene film 100, is preferably 5.0 nm or more, more preferably 8.0 nm or more, even more preferably 10.0 nm or more, even more preferably 12.0 nm or more, and even more preferably 14.0 nm or more.
  • the sum of the crystal long period S1 in the MD direction and the crystal long period S2 in the TD direction of the biaxially oriented polypropylene film 100 obtained by SAXS measurement ( S1 + S2 ) is preferably 44.5 nm or less, more preferably 44.0 nm or less, even more preferably 43.5 nm or less, even more preferably 43.0 nm or less, even more preferably 40.0 nm or less, even more preferably 35.0 nm or less, even more preferably 32.0 nm or less, even more preferably 30.0 nm or less, and even more preferably 28.0 nm or less, from the viewpoint of further improving the performance balance of the transparency and water vapor barrier property of the biaxially oriented polypropylene film 100, is preferably 15.0 nm or more, more preferably 20.0 nm or more, even more preferably 25.0 nm or more, even more preferably 28.0 nm or more, even more preferably 30.0 nm or more, even more preferably
  • the amorphous thickness S4 in the TD direction of the biaxially oriented polypropylene film 100 is preferably 15.5 nm or less, more preferably 15.2 nm or less, even more preferably 15.0 nm or less, even more preferably 14.5 nm or less, even more preferably 13.0 nm or less, even more preferably 11.0 nm or less, even more preferably 10.0 nm or less, and even more preferably 8.0 nm or less, from the viewpoint of further improving the thermal dimensional stability of the biaxially oriented polypropylene film 100, and is preferably 3.0 nm or more, more preferably 5.0 nm or more, even more preferably 8.0 nm or more, even more preferably 10.0 nm or more, and even more preferably 13.0 nm or more, from the viewpoint of further improving the performance balance of the formability and transparency of the biaxially oriented polypropylene film 100.
  • the amorphous thickness S3 in the MD direction of the biaxially oriented polypropylene film 100 determined by SAXS measurement is, from the viewpoint of further improving the thermal dimensional stability of the biaxially oriented polypropylene film 100, preferably 9.5 nm or less, more preferably 9.0 nm or less, even more preferably 8.8 nm or less, even more preferably 8.6 nm or less, and even more preferably 8.0 nm or less, and from the viewpoint of further improving the performance balance of the formability and transparency of the biaxially oriented polypropylene film 100, is preferably 3.0 nm or more, more preferably 5.0 nm or more, even more preferably 7.0 nm or more, even more preferably 7.5 nm or more, and even more preferably 8.0 nm or more.
  • the sum ( S3 + S4 ) of the amorphous thickness S3 in the MD direction and the amorphous thickness S4 in the TD direction of the biaxially oriented polypropylene film 100 obtained by SAXS measurement is preferably 24.5 nm or less, more preferably 24.0 nm or less, even more preferably 23.5 nm or less, even more preferably 23.0 nm or less, even more preferably 20.0 nm or less, even more preferably 18.0 nm or less, even more preferably 16.0 nm or less, and even more preferably 15.0 nm or less, from the viewpoint of further improving the thermal dimensional stability of the biaxially oriented polypropylene film 100, and is preferably 5.0 nm or more, more preferably 8.0 nm or more, even more preferably 10.0 nm or more, even more preferably 13.0 nm or more, even more preferably 15.0 nm or more, even more preferably 17.0 nm or more, even more preferably 20.0
  • the crystal thickness S6 in the TD direction of the biaxially oriented polypropylene film 100 determined by SAXS measurement is, from the viewpoint of further improving the performance balance of the formability and thermal dimensional stability of the biaxially oriented polypropylene film 100, preferably 13.5 nm or less, more preferably 13.0 nm or less, even more preferably 12.5 nm or less, even more preferably 12.0 nm or less, even more preferably 10.0 nm or less, and even more preferably 8.0 nm or less, and from the viewpoint of further improving the performance balance of the transparency and water vapor barrier property of the biaxially oriented polypropylene film 100, preferably 3.0 nm or more, more preferably 5.0 nm or more, even more preferably 8.0 nm or more, even more preferably 10.0 nm or more, even more preferably 12.0 nm or more, and even more preferably 12.5 nm or more.
  • the crystal thickness S5 in the MD direction of the biaxially oriented polypropylene film 100 determined by SAXS measurement is preferably 9.0 nm or less, more preferably 8.0 nm or less, and even more preferably 7.5 nm or less, from the viewpoint of further improving the performance balance of the formability and thermal dimensional stability of the biaxially oriented polypropylene film 100, and is preferably 3.0 nm or more, more preferably 5.0 nm or more, and even more preferably 6.5 nm or more, from the viewpoint of further improving the performance balance of the transparency and water vapor barrier property of the biaxially oriented polypropylene film 100.
  • the sum ( S5 + S6 ) of the crystal thickness S5 in the MD direction and the crystal thickness S6 in the TD direction of the biaxially oriented polypropylene film 100 obtained by SAXS measurement is, from the viewpoint of further improving the performance balance of the formability and thermal dimensional stability of the biaxially oriented polypropylene film 100, preferably 21.0 nm or less, more preferably 20.5 nm or less, even more preferably 20.0 nm or less, even more preferably 19.0 nm or less, even more preferably 18.0 nm or less, even more preferably 17.0 nm or less, even more preferably 16.0 nm or less, and even more preferably 15.5 nm or less, and from the viewpoint of further improving the performance balance of the transparency and water vapor barrier property of the biaxially oriented polypropylene film 100, is preferably 5.0 nm or more, more preferably 8.0 nm or more, even more preferably 10.0 nm or more, even more preferably 13.0 nm
  • the crystalline long period, amorphous thickness, and crystalline thickness of the biaxially stretched polypropylene film 100 can be adjusted, for example, by adjusting the type and content ratio of the propylene-based polymer contained in the biaxially stretched film layer 101, the thickness and stretch ratio of the biaxially stretched film layer 101, the constituent material and thickness of the surface resin layer 103, etc.
  • the sum (T1 + T2) of the tensile modulus T1 in the MD direction and the tensile modulus T2 in the TD direction of the biaxially oriented polypropylene film 100, measured in accordance with JIS K7127 (1999) using a tensile tester under conditions of a measurement temperature of 23 ⁇ 2 ° C , 50 ⁇ 5% RH, and a tensile speed of 5 mm/min, is preferably 3000 MPa or more, more preferably 3500 MPa or more, even more preferably 4000 MPa or more, even more preferably 5000 MPa or more, even more preferably 6000 MPa or more, even more preferably 6500 MPa or more, and is preferably 10000 MPa or less, more preferably 8000 MPa or less, and even more preferably 7500 MPa or less.
  • the biaxially oriented polypropylene film 100 can have a better balance of performance such as thermal dimensional stability, formability, water vapor barrier property, mechanical properties, transparency, bag formability, and handleability. Furthermore, the stiffness of the biaxially oriented polypropylene film 100 can be improved, and as a result, the film can be prevented from shifting in position during heat sealing, thereby preventing the occurrence of defective sealing.
  • the biaxially oriented polypropylene film 100 can have a better balance of thermal dimensional stability, formability, water vapor barrier properties, mechanical properties, transparency, bag formability, handleability, and packaging suitability.
  • a tensile modulus is a substitute value for quantitatively measuring the stiffness of a film, and can be adjusted, for example, by adjusting the type and content ratio of the propylene-based polymer contained in the biaxially oriented film layer 101, the thickness and stretching ratio of the biaxially oriented film layer 101, the constituent material and thickness of the surface resin layer 103, etc.
  • the tensile modulus T1 in the MD direction of the biaxially oriented polypropylene film 100 is preferably 1000 MPa or more, more preferably 1200 MPa or more, even more preferably 1300 MPa or more, even more preferably 1400 MPa or more, even more preferably 1500 MPa or more, even more preferably 1800 MPa or more, even more preferably 2000 MPa or more, and even more preferably 2300 MPa or more, from the viewpoint of further improving the performance balance of the biaxially oriented polypropylene film 100, including the thermal dimensional stability, antistatic properties, bag formability, and packaging suitability.
  • the tensile modulus T1 in the MD direction of the biaxially oriented polypropylene film 100 is preferably 4000 MPa or less, more preferably 3500 MPa or less, even more preferably 3000 MPa or less, even more preferably 2800 MPa or less, and even more preferably 2600 MPa or less, from the viewpoint of further improving the performance balance of the biaxially oriented polypropylene film 100, including the thermal dimensional stability, antistatic properties, bag formability, and packaging suitability.
  • the biaxially oriented polypropylene film 100 of this embodiment preferably has the property of expanding in the TD direction and shrinking in the MD direction when heat-treated at 120°C for 15 minutes in accordance with JIS C2151:2019, from the viewpoint of further improving the thermal dimensional stability of the biaxially oriented polypropylene film 100.
  • thermo dimensional stability of biaxially oriented polypropylene films is required from the viewpoint of suppressing thermal wrinkles in the sealed portions during bag making and from the viewpoint of suppressing thermal elongation during vapor deposition and coating processes.
  • the thermal dimensional stability of the biaxially oriented polypropylene film 100 can be improved by having the property of expanding in the TD direction and shrinking in the MD direction when heated at 120°C for 15 minutes.
  • a roll of biaxially oriented polypropylene film is unwound in the MD direction, and bag making, coating, vapor deposition, etc. are performed while tension is applied.
  • the biaxially oriented polypropylene film 100 of the present embodiment has the property of expanding in the TD direction and shrinking in the MD direction when heated at 120° C. for 15 minutes, and is therefore considered to be less susceptible to thermal shrinkage in the TD direction and thermal elongation in the MD direction even when the biaxially oriented polypropylene film 100 is heated.
  • the biaxially oriented polypropylene film 100 of the present embodiment which has the property of expanding in the TD direction and shrinking in the MD direction when heated at 120° C. for 15 minutes in accordance with JIS C2151:2019, has improved thermal dimensional stability, and as a result, it is possible to further suppress thermal wrinkles in the sealed portion.
  • the thermal dimensional stability can be further improved.
  • such a biaxially oriented polypropylene film 100 has improved thermal dimensional stability, it is possible to suppress thermal wrinkles in the sealed portions during bag making, thereby further improving bag making properties.
  • the biaxially oriented polypropylene 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 biaxially oriented polypropylene film 100 when heat-treated at 120°C for 15 minutes is, from the viewpoint of further improving the performance balance between thermal dimensional stability and bag formability, and from the viewpoint of further suppressing thermal wrinkles in the sealed portion and obtaining a bag product with good thermal wrinkles in the sealed portion, 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 between thermal dimensional stability and bag formability, it is preferably 2.0% or less, more preferably 1.5% or less, even more preferably 1.2% or less, even more preferably 1.0% or less, and even more preferably 0.8% or less.
  • a roll of biaxially oriented polypropylene film is unwound in the MD direction, and bag making, coating, deposition, etc. are performed while tension is applied. That is, since no tension is applied in the TD direction, the biaxially oriented polypropylene film is susceptible to heat shrinkage when heated, and heat wrinkles are easily formed in the sealed portion. On the other hand, if the thermal expansion coefficient in the TD direction when heated at 120°C for 15 minutes is within the above range, heat shrinkage is unlikely to occur in the TD direction even when the biaxially oriented polypropylene film 100 is heated, and heat wrinkles in the sealed portion can be further suppressed.
  • the thermal expansion coefficient in the TD direction of the biaxially oriented polypropylene film 100 when it is heat-treated at 120° C. for 15 minutes is calculated by the following method. First, a test piece of 10 cm x 10 cm is cut out from the biaxially stretched polypropylene film 100, and this test piece is heat-treated for 15 minutes at 120° C. Next, when the length in the TD direction of the test piece after the heat treatment is TD 1 [cm], 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 biaxially oriented polypropylene film 100 when heated at 120°C for 15 minutes is, from the viewpoint of further improving the performance balance between thermal dimensional stability and bag formability, and from the viewpoint of further suppressing thermal elongation of the film during processing, 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.
  • a roll of biaxially oriented polypropylene film is unwound in the MD direction, and bag making, coating, deposition, etc. are performed while tension is applied.
  • the heat shrinkage rate in the MD direction of the biaxially oriented polypropylene film 100 when it is heat-treated at 120° C. for 15 minutes is calculated by the following method. First, a test piece of 10 cm x 10 cm is cut out from the biaxially stretched polypropylene film 100, and this test piece is heat-treated for 15 minutes at 120° C. Next, when the length in the MD direction of the test piece after heat treatment is MD 1 [cm], the heat shrinkage rate [%] in the MD direction is calculated by 100 x (10 - MD 1 )/10.
  • the heat shrinkage rate XTD in the TD direction of the biaxially oriented polypropylene film 100 when heat-treated at 150°C for 15 minutes is, from the viewpoint of further improving the performance balance between thermal dimensional stability and bag formability, preferably 8.5% or less, more preferably 7.0% or less, even more preferably 5.0% or less, even more preferably 3.0% or less, even more preferably 2.0% or less, even more preferably 1.0% or less, even more preferably 0.8% or less, and may be 0.0% or more, 0.1% or more, or 0.2% or more.
  • the heat shrinkage rate XMD in the MD direction of the biaxially oriented polypropylene film 100 when heat-treated at 150°C for 15 minutes is, from the viewpoint of further improving the performance balance between thermal dimensional stability and bag formability, preferably 8.0% or less, more preferably 7.0% or less, even more preferably 6.0% or less, even more preferably 5.5% or less, even more preferably 5.0% or less, and even more preferably 4.8% or less, and may be 0.1% or more, 0.5% or more, 1.0% or more, 1.5% or more, 2.0% or more, or 2.5% or more.
  • X TD [%] and X MD [%] when the heat shrinkage rate in the TD direction and the heat shrinkage rate in the MD direction when heated at 150° C. for 15 minutes are X TD [%] and X MD [%], respectively, X TD +X MD is preferably less than 7.0%, more preferably 6.5% or less, and even more preferably less than 6.0%, from the viewpoint of further improving the performance balance of the thermal dimensional stability and bag formability of the biaxially stretched polypropylene film 100. Moreover, X TD [%] and X MD [%] of the biaxially stretched polypropylene film 100 are calculated by the following method.
  • a test piece of 10 cm x 10 cm is cut out from the biaxially stretched polypropylene film 100, and this test piece is heat-treated for 15 minutes at 150° C.
  • TD 1 [cm] the length in the TD direction of the test piece after heat treatment
  • MD 1 [cm] the length in the MD direction of the test piece after 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 biaxially oriented polypropylene film 100 can be adjusted, for example, by adjusting the type and content ratio of the propylene-based polymer contained in the biaxially oriented film layer 101, the thickness and stretching ratio of the biaxially oriented film layer 101, the constituent material and thickness of the surface resin layer 103, etc.
  • the thermal expansion coefficient and thermal shrinkage coefficient of the biaxially oriented polypropylene film 100 can be measured in accordance with JIS C2151:2019.
  • the heat fusion strength when the biaxially oriented polypropylene films 100 are heat sealed together at 200°C is preferably 4.0 N/15 mm or less, from the viewpoint of further improving the performance balance between thermal dimensional stability and bag formability.
  • the heat fusion strength is used as an index of the heat fusion resistance of the biaxially oriented polypropylene film surface. It can be determined that the lower the heat fusion strength, the better the heat fusion resistance of the biaxially oriented polypropylene film surface.
  • the heat fusion strength when heat sealed at 200° C. can be measured by the following method.
  • two biaxially oriented polypropylene films 100 are heat fused under the conditions of 200° C., pressure of 2.0 kgf, and sealing time of 1.0 second to obtain a laminated film.
  • the two biaxially oriented polypropylene films 100 are peeled under the conditions of 15 mm width, 90 degree peel, peel speed of 300 mm/min, and tension in the TD direction, and the peel strength at this time is taken as the heat fusion strength.
  • thermo dimensional stability of biaxially oriented polypropylene films is required from the viewpoint of suppressing thermal wrinkles in the sealed portions during bag making and from the viewpoint of suppressing thermal elongation during vapor deposition and coating processes.
  • a biaxially oriented polypropylene film having a heat fusion strength of 4.0 N/15 mm or less when heat sealed at 200° C. can have improved thermal dimensional stability. That is, according to the biaxially oriented polypropylene film 100 of this embodiment, which has a heat fusion strength of 4.0 N/15 mm or less when heat sealed at 200° C., the thermal dimensional stability can be further improved.
  • biaxially oriented polypropylene film 100 has improved thermal dimensional stability, it is possible to suppress thermal wrinkles in the sealed portions during bag making, thereby further improving bag making properties. Furthermore, from the perspective of environmental issues, there is a demand for mono-material packaging materials, and from the perspective of suppressing heat wrinkles in the sealed parts during bag making and suppressing heat fusion of the film to the sealing bar, there is a demand for film surfaces with improved heat resistance compared to conventional biaxially oriented polypropylene films.
  • the biaxially oriented polypropylene film 100 of this embodiment has a heat fusion strength of 4.0 N/15 mm or less when heat sealed at 200°C, and has an improved performance balance between thermal dimensional stability and heat resistance of the film surface, which can further suppress heat wrinkles in the sealed area during bag making and heat fusion of the film to the seal bar.
  • the heat fusion strength (TD tensile direction) of the portion heat-sealed under conditions of 200°C, a pressure of 2.0 kgf, and a sealing time of 1.0 second is preferably 4.0 N/15 mm or less, more preferably 3.5 N/15 mm or less, even more preferably 3.0 N/15 mm or less, even more preferably 2.5 N/15 mm or less, even more preferably 2.0 N/15 mm or less, even more preferably 1.5 N/15 mm or less, and even more preferably 1.3 N/15 mm or less.
  • the lower limit of the heat fusion strength of the biaxially oriented polypropylene film 100 at 200°C is not particularly limited, but may be 0.01 N/15 mm or more, 0.05 N/15 mm or more, 0.1 N/15 mm or more, 0.3 N/15 mm or more, 0.5 N/15 mm or more, or 0.8 N/15 mm or more.
  • the heat fusion strength is used as an index of the heat fusion resistance of the biaxially oriented polypropylene film surface. It can be determined that the lower the heat fusion strength, the better the heat fusion resistance of the biaxially oriented polypropylene film surface.
  • the heat fusion strength can be measured by the following method.
  • two biaxially oriented polypropylene films 100 are heat fused under the conditions of 200° C., pressure of 2.0 kgf, and sealing time of 1.0 second to obtain a laminated film.
  • the two biaxially oriented polypropylene films 100 are peeled under the conditions of 15 mm width, 90 degree peel, peel speed of 300 mm/min, and tension in the TD direction, and the peel strength at that time is taken as the heat fusion strength.
  • Such heat fusion strength can be adjusted, for example, by adjusting the type and content ratio of the homopolypropylene (A) and polymer (B) contained in the biaxially oriented film layer 101, the thickness and stretching ratio of the biaxially oriented film layer 101, the constituent material and thickness of the surface resin layer 103, etc.
  • the heat fusion strength when the biaxially oriented polypropylene films 100 are heat-sealed together at 170°C is preferably 1.0 N/15 mm or less, more preferably 0.8 N/15 mm or less, even more preferably 0.5 N/15 mm or less, even more preferably 0.3 N/15 mm or less, and even more preferably 0.2 N/15 mm or less, from the viewpoint of further improving the performance balance of thermal dimensional stability and bag formability.
  • the lower limit of the heat fusion strength of the biaxially oriented polypropylene film 100 at 170°C is not particularly limited, but may be 0.01 N/15 mm or more, 0.03 N/15 mm or more, or 0.05 N/15 mm or more.
  • the heat fusion strength when heat sealed at 170° C. can be measured by the following method. First, two biaxially oriented polypropylene films 100 are heat fused under the conditions of 170° C., pressure of 2.0 kgf, and sealing time of 1.0 second to obtain a laminated film.
  • the two biaxially oriented polypropylene films 100 are peeled under the conditions of 15 mm width, 90 degree peel, peel speed of 300 mm/min, and tension in the TD direction, and the peel strength at this time is taken as the heat fusion strength.
  • the heat fusion strength at 170°C can be adjusted, for example, by adjusting the type and content ratio of the propylene-based polymer contained in the biaxially oriented film layer 101, the thickness and stretching ratio of the biaxially oriented film layer 101, the constituent material and thickness of the surface resin layer 103, etc.
  • the haze of the biaxially oriented polypropylene film 100 is preferably 5.0% or less, more preferably 3.0% or less, even more preferably 2.5% or less, even more preferably 2.0% or less, even more preferably 1.5% or less, and even more preferably 1.0% or less, from the viewpoint of further improving the transparency of the biaxially oriented polypropylene film 100.
  • Such haze can be adjusted, for example, by adjusting the type and content ratio of the propylene-based polymer contained in the biaxially oriented film layer 101, the thickness and stretching ratio of the biaxially oriented film layer 101, the constituent material and thickness of the surface resin layer 103, etc.
  • the food packaging produced using the biaxially oriented polypropylene film 100 exhibits sufficient performance in terms of water vapor barrier properties. Therefore, the biaxially oriented polypropylene film 100 can be particularly suitably used as a food packaging film for packaging foods that require water vapor barrier properties.
  • the water vapor permeability of the biaxially oriented polypropylene film 100 is preferably 20.0 g/( m2 ⁇ 24 h) or less, more preferably 15.0 g/( m2 ⁇ 24 h) or less, even more preferably 12.0 g/( m2 ⁇ 24 h) or less, even more preferably 10.0 g/( m2 ⁇ 24 h) or less, and even more preferably 8.0 g/( m2 ⁇ 24 h) or less.
  • the biaxially oriented polypropylene film 100 is folded and two sides are heat sealed to form a bag.
  • Calcium chloride is then placed in the bag as the content.
  • the other side is then heat sealed to create a bag with a surface area of 0.01 m2 .
  • the resulting bag is then stored for 72 hours under conditions of 40°C and 90% RH.
  • the mass of calcium chloride before and after storage is measured, and the water vapor transmission rate (g/( m2 ⁇ 24h)) is calculated from the difference.
  • Such water vapor permeability can be adjusted, for example, by adjusting the type and content ratio of the propylene-based polymer contained in the biaxially oriented film layer 101, the thickness and stretching ratio of the biaxially oriented film layer 101, the constituent material and thickness of the surface resin layer 103, etc.
  • the biaxially oriented polypropylene film 100 of this embodiment can improve the thermal dimensional stability.
  • the biaxially oriented polypropylene film 100 has improved thermal dimensional stability, it is possible to more effectively suppress thermal wrinkles in the sealed portions during bag making, thereby further improving bag making properties.
  • the amount of structural units derived from ⁇ -olefins other than propylene contained in the biaxially oriented polypropylene film 100 is preferably 0.05 mol% or more, more preferably 0.1 mol% or more, even more preferably 0.3 mol% or more, and even more preferably 0.5 mol% or more, from the viewpoint of further improving the performance balance of the formability, thermal dimensional stability, and bag formability of the biaxially oriented polypropylene film 100; and from the viewpoint of further improving the performance balance of the thermal dimensional stability, water vapor barrier property, bag formability, and transparency of the biaxially oriented polypropylene film 100, is preferably 50.0 mol% or less, more preferably 30.0 mol% or less, even more preferably 25.0 mol% or less, even more preferably 20.0 mol% or less, even more preferably 15.0 mol% or less,
  • the softening effect of the structural units derived from ⁇ -olefins exerts an effect of suppressing the yield point stress at the start of stretching in the stretching process, improving ease of formability.
  • the low melting point effect of the structural units derived from ⁇ -olefins more efficiently relieves residual stress in the heat setting process during film molding, improving formability and suppressing thickness unevenness.
  • the thermal dimensional stability of the biaxially stretched polypropylene film 100 can be further improved.
  • the amount of structural units derived from ⁇ -olefins other than propylene in the biaxially oriented polypropylene film 100 can be measured by the method described in the Examples.
  • the ⁇ -olefin in the structural units derived from ⁇ -olefins other than propylene contained in the biaxially stretched polypropylene film 100 includes, for example, one or more selected from the group consisting of ethylene and ⁇ -olefins having 4 to 10 carbon atoms, preferably one or more selected from the group consisting of ethylene and ⁇ -olefins having 4 to 8 carbon atoms, more preferably one or more selected from the group consisting of ethylene, 1-butene, and 1-octene, and even more preferably one or two selected from the group consisting of ethylene and 1-butene.
  • the thickness of the biaxially oriented polypropylene 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 performance such as thermal dimensional stability, formability, water vapor barrier properties, cost, mechanical properties, transparency, bag formability, 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 biaxially oriented polypropylene film 100 are described below.
  • the biaxially oriented film layer 101 (also called a biaxially oriented polypropylene-based film layer) contains a propylene-based polymer.
  • the biaxially stretched film layer 101 is formed, for example, by biaxially stretching a film made of a propylene-based polymer composition containing a propylene-based polymer.
  • 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 oriented 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 performance balance of the biaxially oriented polypropylene film 100, such as thermal dimensional stability, formability, water vapor barrier properties, cost, mechanical properties, transparency, bag formability, handleability, 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 20 ⁇ m or less.
  • the ratio of the thickness of the biaxially oriented film layer 101 to the total thickness of the biaxially oriented polypropylene 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 of the present embodiment contains a propylene-based polymer.
  • the propylene polymer content in the propylene polymer composition of the present embodiment i.e., the biaxially stretched film layer 101, is preferably 60% by mass or more, more preferably 70% by mass or more, even 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, and for example, 100% by mass or less, when the entire propylene polymer composition is taken as 100% by mass.
  • the propylene-based polymer of the present embodiment is a polymer containing a structural unit derived from propylene, and examples thereof include homopolypropylene (A); at least one polymer (B) selected from the group consisting of random polypropylene (B1) and ⁇ -olefin copolymer (B2); and the like.
  • homopolypropylene (A) examples include propylene homopolymers and propylene copolymers having a content of structural units derived from ⁇ -olefins other than propylene of 2.0 mol % or less.
  • the content of structural units derived from propylene in the homopolypropylene (A) is 98.0 mol % or more, preferably 98.5 mol % or more, more preferably 98.7 mol % or more, even more preferably 99.0 mol % or more, even more preferably 99.5 mol % or more, even 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, when the entire homopolypropylene (A) is taken as 100 mol %, is preferably 2.0 mol % or less, more preferably 1.5 mol % or less, even 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.
  • the homopolypropylene (A) in the biaxially oriented film layer 101 may be used alone or in combination of two or more kinds.
  • the isotactic mesopentad fraction (mmmm) of the homopolypropylene (A) 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 performance such as thermal dimensional stability, heat resistance, water vapor barrier property, mechanical properties, rigidity, and bag formability of the biaxially stretched polypropylene film 100.
  • the upper limit of the isotactic mesopentad fraction (mmmm) of the homopolypropylene (A) 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 (A) can be the isotactic mesopentad fraction of a mixture obtained by melt blending two or more types of homopolypropylene (A) by a known method.
  • the melt flow rate (MFR) of the homopolypropylene (A), measured in accordance with ASTM D1238 under conditions of 230°C and a load of 2.16 kg, is preferably 0.5 g/10 min or more, more preferably 1.0 g/10 min or more, and even more preferably 2.0 g/10 min or more, from the viewpoint of further improving the balance of performance between fluidity and moldability, and is preferably 20.0 g/10 min or less, more preferably 10.0 g/10 min or less, and even more preferably 7.0 g/10 min or less, from the viewpoint of further stabilizing moldability.
  • the MFR of the homopolypropylene (A) can be the MFR of a mixture obtained by melt blending two or more types of homopolypropylene (A) by a known method.
  • the melting point of the homopolypropylene (A) 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 (A) is the peak temperature of the maximum melting peak.
  • Homopolypropylene (A) can be produced by various methods. For example, it can be produced using known catalysts such as Ziegler-Natta catalysts and metallocene catalysts.
  • the polymer (B) contains at least one selected from the group consisting of random polypropylene (B1) and ⁇ -olefin copolymer (B2), and preferably contains random polypropylene (B1).
  • the melt flow rate (MFR) of the polymer (B), measured in accordance with ASTM D1238 under conditions of 230°C and a load of 2.16 kg, is, from the viewpoint of further improving the performance balance of the moldability and thermal dimensional stability of the biaxially oriented polypropylene film 100, preferably 0.01 g/10 min or more, more preferably 0.1 g/10 min or more, even more preferably 0.5 g/10 min or more, even more preferably 1.0 g/10 min or more, even more preferably 2.0 g/10 min or more, and is preferably 30.0 g/10 min or less, more preferably 20.0 g/10 min or less, even more preferably 15.0 g/10 min or less, even more preferably 12.0 g/10 min or less, and even more preferably 10.0 g/10 min or less.
  • the MFR of a mixture obtained by melt blending two or more kinds of the polymer (B) by a known method can be adopted.
  • the melting point of the polymer (B) is preferably 50°C or higher, more preferably 60°C or higher, even more preferably 70°C or higher, even more preferably 80°C or higher, and even more preferably 90°C or higher, and is preferably 155°C or lower, more preferably 150°C or lower, even more preferably 148°C or lower, and even more preferably 145°C or lower.
  • the melting point of polymer (B) is the peak temperature of the maximum melting peak.
  • the weight average molecular weight (Mw) of the polymer (B) is preferably 100,000 or more, more preferably 150,000 or more, even more preferably 200,000 or more, and even more preferably 220,000 or more, from the viewpoint of further improving the performance balance of the formability, thermal dimensional stability, blocking resistance, and sheet payout property of the biaxially oriented polypropylene film 100, and 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, from the viewpoint of further improving the thermal dimensional stability.
  • the weight average molecular weight (Mw)/number average molecular weight (Mn) of the polymer (B) is preferably 1.5 or more, more preferably 1.8 or more, from the viewpoint of further improving the performance balance of the formability, thermal dimensional stability, blocking resistance, and sheet payout ability of the biaxially oriented polypropylene film 100, and 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, from the viewpoint of further improving the performance balance of the formability, thermal dimensional stability, blocking resistance, and sheet payout ability of the biaxially oriented polypropylene film 100.
  • the weight average molecular weight (Mw) and number average molecular weight (Mn) of the polymer (B) can be the weight average molecular weight (Mw) and number average molecular weight (Mn) of a mixture obtained by melt blending two or more kinds of the polymer (B) by a known method.
  • the weight average molecular weight (Mw) and number average molecular weight (Mn) of the polymer (B) can be measured by the method described in the examples.
  • the content of polymer (B) is preferably 1% by mass or more, more preferably 2% by mass or more, and even more preferably 3% by mass or more, when the entire biaxially oriented film layer 101 is taken as 100% by mass, from the viewpoint of further improving the performance balance of the formability and thermal dimensional stability of the biaxially oriented polypropylene film 100. From the viewpoint of further improving the performance balance of the thermal dimensional stability, water vapor barrier properties, transparency, mechanical properties, rigidity, bag formability, fluidity, formability, etc.
  • the content is preferably 50% by mass or less, more preferably 40% by mass or less, even more preferably 30% by mass or less, even more preferably 25% by mass or less, even more preferably 22% by mass or less, and even more preferably 20% by mass or less.
  • the random polypropylene (B1) includes a random copolymer of propylene and an ⁇ -olefin other than propylene, in which the content of structural units derived from an ⁇ -olefin other than propylene is more than 2.0 mol % and not more than 15.0 mol %.
  • 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 ethylene and 1-butene, and even more preferably ethylene.
  • the content of structural units derived from ⁇ -olefins other than propylene in the random polypropylene (B1), when the entire random polypropylene (B1) is taken as 100 mol%, is preferably more than 2.0 mol%, 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 4.0 mol% or more, from the viewpoint of further improving the performance balance of the formability, thermal dimensional stability, and bag formability of the biaxially oriented polypropylene film 100, and is preferably 15.0 mol% or less, more preferably 12.0 mol% or less, even more preferably 10.0 mol% or less, even more preferably 8.0 mol% or less, and even more preferably 6.5 mol% or less, from the viewpoint of further improving the performance balance of the thermal dimensional stability, water vapor barrier property, bag formability, and transparency of the biaxially oriented polypropylene film 100.
  • the random polypropylene (B1) preferably contains one or more selected from the group consisting of a propylene-ethylene random copolymer, a propylene-ethylene-1-butene random copolymer, and a propylene-1-butene random copolymer, more preferably contains one or more selected from the group consisting of a propylene-ethylene random copolymer, and a propylene-1-butene random copolymer, and even more preferably contains a propylene-ethylene random copolymer.
  • the random polypropylene (B1) in the biaxially oriented film layer 101 may be used alone or in combination of two or more kinds.
  • the ⁇ -olefin copolymer (B2) is a copolymer of two or more kinds of ⁇ -olefins, and includes, for example, an ⁇ -olefin copolymer in which the content of structural units derived from an ⁇ -olefin other than propylene exceeds 15.0 mol %.
  • the ⁇ -olefin copolymer (B2) includes a random copolymer of propylene and an ⁇ -olefin other than propylene, in which the content of structural units derived from an ⁇ -olefin other than propylene exceeds 15.0 mol %.
  • the ⁇ -olefin other than propylene includes, for example, one or more selected from the group consisting of ethylene and ⁇ -olefins having 4 to 10 carbon atoms, preferably one or more selected from the group consisting of ⁇ -olefins having 4 to 8 carbon atoms, more preferably at least one selected from 1-butene and 1-octene, and even more preferably 1-butene.
  • the content of structural units derived from an ⁇ -olefin other than propylene in the ⁇ -olefin copolymer (B2), when the entire ⁇ -olefin copolymer (B2) is taken as 100 mol%, is preferably more than 15.0 mol%, more preferably 20.0 mol% or more, even more preferably 30.0 mol% or more, even more preferably 50.0 mol% or more, even more preferably 70.0 mol% or more, and even more preferably 80.0 mol% or more, from the viewpoint of further improving the performance balance of the formability, thermal dimensional stability, and bag formability of the biaxially oriented polypropylene film 100, and is preferably 99.0 mol% or less, more preferably 98.0 mol% or less, even more preferably 95.0 mol% or less, even more preferably 92.0 mol% or less, and even more preferably 90.0 mol% or less, from the viewpoint of further improving the performance balance of the thermal dimensional stability, water vapor barrier property,
  • the ⁇ -olefin copolymer (B2) preferably comprises a random copolymer of propylene and one or more ⁇ -olefins selected from the group consisting of ethylene and ⁇ -olefins having 4 to 10 carbon atoms, more preferably a random copolymer of propylene and one or two ⁇ -olefins selected from the group consisting of 1-butene and 1-octene, and even more preferably a random copolymer of propylene and 1-butene.
  • the ⁇ -olefin copolymer (B2) in the biaxially stretched film layer 101 may be used alone or in combination of two or more kinds.
  • Polymer (B) can be produced by various methods. For example, it can be produced using known catalysts such as Ziegler-Natta catalysts and metallocene catalysts.
  • 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 as necessary within a range that does not impair the object of the present embodiment.
  • the propylene polymer composition of the present embodiment can be prepared by mixing or melt-kneading the components 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 heated roll, or the like.
  • the biaxially oriented polypropylene film 100 further comprises a surface resin layer 103 on at least one side of the biaxially oriented film layer 101 in order to impart functions such as heat resistance, heat sealability, antistatic properties, blocking resistance, printability, and slip properties to the film surface depending on the purpose.
  • the surface resin layer 103 may be provided on both sides of the biaxially stretched film layer 101. By providing the surface resin layer 103 on both sides of the biaxially stretched film layer 101, different functions can be imparted to each surface of the film.
  • the surface resin layer 103 is preferably provided on the outermost layer of the biaxially oriented polypropylene film 100 in order to further improve the functions of the biaxially oriented polypropylene film 100, such as heat resistance, heat sealability, antistatic properties, blocking resistance, printability, slip properties, etc., depending on the purpose.
  • the surface resin layer 103 is preferably provided so as to be in direct contact with the surface of the biaxially oriented film layer 101. This simplifies the manufacturing process of the biaxially oriented polypropylene film 100.
  • the thickness of the surface resin layer 103 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 biaxially oriented polypropylene film 100, such as heat fusion resistance, antistatic properties, blocking resistance, printability, and slip properties, 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 performance balance of the biaxially oriented polypropylene film 100, such as heat fusion resistance, thermal dimensional stability, formability, cost, mechanical properties, transparency, environmental compatibility, and light weight.
  • the thickness of the surface resin layer 103 refers to the thickness of the surface resin layer 103 provided on one side of the biaxially stretched film layer 101. That is, in this embodiment, when the surface resin layer 103 is provided on both sides of the biaxially stretched film layer 101, the above-mentioned thickness of the surface resin layer 103 indicates the thickness of the surface resin layer 103 provided on one side of the biaxially stretched film layer 101.
  • the surface resin layer 103 is a single layer. This makes it possible to further simplify the manufacturing process of the biaxially oriented polypropylene film 100.
  • the surface resin layer 103 is preferably formed by biaxial stretching at the same time as the biaxially stretched film layer 101 in a state before biaxial stretching. This allows the biaxially stretched polypropylene 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 biaxially stretched polypropylene film 100. Therefore, it is preferable that the surface resin layer 103 is biaxially stretched.
  • the surface resin layer 103 may be subjected to a surface treatment in order to further improve the balance of printability and blocking resistance of the biaxially oriented polypropylene film 100.
  • a surface activation treatment such as corona treatment, flame treatment, plasma treatment, primer coat treatment, or ozone treatment may be performed.
  • the surface resin layer 103 is composed of, for example, a polyolefin-based resin composition (A) containing a polyolefin.
  • the polyolefin constituting the surface resin layer 103 includes, for example, one or more 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
  • homopolypropylene is preferred as the polyolefin constituting the surface resin layer 103 from the viewpoint of further improving the balance of performance such as heat fusion resistance, thermal dimensional stability, heat resistance, water vapor barrier property, transparency, mechanical properties, rigidity, bag formability, fluidity, and moldability of the biaxially oriented polypropylene film 100.
  • the preferred embodiment of the homopolypropylene constituting the surface resin layer 103 is the same as the homopolypropylene (A) described above. That is, the homopolypropylene constituting the surface resin layer 103 preferably contains the homopolypropylene (A) described above.
  • the content of polyolefin in the polyolefin resin composition (A), i.e., the surface resin layer 103 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, when the entire polyolefin resin composition (A), i.e., the entire surface resin layer 103, is taken as 100% by mass.
  • the content of homopolypropylene (A) in the polyolefin resin composition (A), i.e., the surface resin layer 103 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, when the entire polyolefin resin composition (A), i.e., the entire surface resin layer 103, is taken as 100% by mass.
  • additives such as tackifiers, heat stabilizers, weather stabilizers, antioxidants, UV absorbers, lubricants, slipping agents, nucleating agents, antiblocking agents, antistatic agents, antifogging agents, pigments, dyes, and inorganic or organic fillers may be added to the polyolefin resin composition (A) constituting the surface resin layer 103, within a range that does not impair the object of this embodiment.
  • the polyolefin resin composition (A) can be prepared, for example, by mixing or melt-kneading the components 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 heated roll, or the like.
  • the biaxially oriented polypropylene 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, if necessary, a polyolefin-based resin composition (A) for forming the surface resin layer 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 biaxially oriented polypropylene film 100 can also be obtained by separately molding the biaxially oriented film layer 101 and, if necessary, the surface resin layer 103, laminating them together and molding them under heat.
  • the biaxially oriented polypropylene film 100 can also be suitably used as a food packaging film that constitutes a food package.
  • the food packaging of this embodiment is a packaging that uses a biaxially oriented polypropylene film 100, and is, for example, a packaging bag used for the purpose of containing food. Furthermore, the food packaging of this embodiment may use the biaxially oriented polypropylene film 100 in only a portion thereof depending on the application, or the biaxially oriented polypropylene film 100 may be used for the entire food packaging.
  • the food packaging of this embodiment includes the food packaging of this embodiment and food inside the food packaging.
  • the food packaging of this embodiment is the food packaging of this embodiment that contains food.
  • the biaxially oriented polypropylene film 100 may further include one or more layers selected from the group consisting of a sealant layer and a coating layer.
  • the biaxially oriented polypropylene film 100 can also be used as a raw material for coating.
  • 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%)
  • Isotactic mesopentad fraction (mmmm) of homopolypropylene A
  • the isotactic mesopentad fraction (mesopentad fraction, (mmmm)) 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 measured, and the evaluation was made from the integrated intensity of each signal.
  • 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
  • Weight average molecular weight (Mw) and number average molecular weight (Mn) of homopolypropylene (A) and polymer (B) The weight average molecular weight (Mw) and number average molecular weight (Mn) of the homopolypropylene (A) and the polymer (B) 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.
  • 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) In addition, the content of structural units derived from ⁇ -olefins other than propylene contained in the biaxially oriented polypropylene film was measured using the biaxially oriented polypropylene film as a sample.
  • Tensile modulus A test piece of 15 mm x 15 cm was cut out from the biaxially stretched polypropylene film.
  • the tensile modulus of elasticity in the MD direction T1 and the tensile modulus of elasticity in the TD direction T2 of the test piece were measured using a tensile tester manufactured by Orientec Co., Ltd. in accordance with JIS K7127 (1999) under the conditions of a measurement temperature of 23 ⁇ 2 °C, 50 ⁇ 5% RH, and a tensile speed of 5 mm/min.
  • the main melting point (° C.), the heat of fusion ⁇ H (J/g) of the entire film, and the heat of fusion ⁇ H (J/g) at 165° C. or less were determined.
  • the peak temperature of the maximum melting peak in the DSC curve was taken as the main melting point.
  • the heat of fusion ⁇ H (J/g) of the entire film was calculated from the melting peak area of the DSC curve in accordance with JIS K 7122:1987 (with the exception that the heating rate was 5° C./min).
  • the total area of the multiple melting peaks was used as the heat of fusion ( ⁇ H) of the entire film.
  • the heat of fusion ⁇ H (J/g) at 165° C. or less is the heat of fusion ⁇ H (J/g) in the range of 165° C. or less out of the heat of fusion ⁇ H (J/g) of the entire film.
  • the crystal ratio (%) at 165° C. or less, the degree of crystallinity (%), the amorphous amount (%), and the crystal amount at 165° C. or less were calculated from the following formulas.
  • SAXS Small angle X-ray scattering
  • the crystal thickness (dc) was calculated by subtracting the amorphous thickness (da) from the crystal long period (d).
  • the length of the test piece in the TD direction 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 of the test piece in the MD direction 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 performed three times, and the average values of the obtained measurements were adopted as the thermal expansion coefficient and thermal shrinkage coefficient of the biaxially oriented polypropylene film at 120 ° C., respectively.
  • Thermal Dimensional Stability The thermal dimensional stability of the biaxially oriented polypropylene film was evaluated according to the following criteria. AA (very good): Heat shrinkage rate ( XMD + XTD ) at 150°C is less than 6.0%. A (good): Heat shrinkage rate ( XMD + XTD ) at 150°C is 6.0% or more and less than 7.0%. B (poor): Heat shrinkage rate ( XMD + XTD ) at 150°C is 7.0% or more and less than 10.0%. C (very bad): Heat shrinkage rate ( XMD + XTD ) at 150°C is 10.0% or more.
  • Stretching temperature in TD direction [°C]: See Table 1.
  • Stretching ratio in TD direction [times]: See Table 1.
  • Relaxation rate [%]: See Table 1.
  • 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 biaxially oriented polypropylene film of the embodiment had improved thermal dimensional stability compared to the biaxially oriented polypropylene film of the comparative example.
  • the present invention can also take the following forms:
  • a biaxially stretched film layer containing a propylene-based polymer is provided, A biaxially oriented polypropylene film having a crystal long period in the TD direction of 28.0 nm or less as determined by small angle X-ray scattering (SAXS) measurement.
  • SAXS small angle X-ray scattering
  • [6a] The biaxially oriented polypropylene film according to [5a], wherein the surface resin layer contains homopolypropylene (A).
  • the content of the homopolypropylene (A) in the surface resin layer is 75% by mass or more and 100% by mass or less, when the entire surface resin layer is 100% by mass.
  • [8a] The biaxially oriented polypropylene film according to any one of [5a] to [7a], wherein the thickness of the surface resin layer is 0.1 ⁇ m or more and 10.0 ⁇ m or less.
  • [11a] The biaxially stretched polypropylene film according to any one of [1a] to [10a], which expands in the TD direction when heat-treated at 120 ° C. for 15 minutes in accordance with JIS C2151:2019.
  • [12a] The biaxially oriented polypropylene film according to any one of [1a] to [11a], which is a food packaging film.
  • [13a] A food packaging material using the biaxially oriented polypropylene film according to any one of [1a] to [12a].
  • [14a] The food packaging material according to [13a] above, and a food product within the food package.
  • the present invention can also take the following forms:
  • a biaxially stretched film layer containing a propylene-based polymer is provided, A biaxially oriented polypropylene film that expands in the TD direction and shrinks in the MD direction when heat-treated at 120°C for 15 minutes in accordance with JIS C2151:2019.
  • the biaxially stretched polypropylene film according to [1b] having a thermal expansion coefficient in the TD direction of 0.1% or more and 2.0% or less when heat-treated at 120 ° C. for 15 minutes in accordance with JIS C2151:2019.
  • the biaxially oriented polypropylene film according to [1b] or [2b] having a heat shrinkage rate in the MD direction of 5.0% or less when heat-treated at 120 ° C.
  • [12b] The biaxially oriented polypropylene film according to any one of [1b] to [11b], wherein the thickness of the biaxially oriented film layer is 5 ⁇ m or more and 100 ⁇ m or less.
  • [13b] The biaxially oriented polypropylene film according to any one of [1b] to [12b], wherein the sum (T1 + T2) of the tensile modulus T1 in the MD direction and the tensile modulus T2 in the TD direction of the biaxially oriented polypropylene film, measured in accordance with JIS K7127 (1999) using a tensile tester under conditions of a measurement temperature of 23 ⁇ 2 °C, 50 ⁇ 5 % RH, and a tensile speed of 5 mm/min, is 3000 MPa or more and 10000 MPa or less.
  • the present invention can also take the following forms:
  • a biaxially oriented polypropylene film having a biaxially oriented film layer containing a propylene-based polymer The biaxially oriented polypropylene film has a heat fusion strength of 4.0 N/15 mm or less when the biaxially oriented polypropylene film is heat sealed to itself at 200°C.
  • the content of the homopolypropylene (A) in the surface resin layer is 75% by mass or more and 100% by mass or less, when the entire surface resin layer is 100% by mass.
  • [8c] The biaxially oriented polypropylene film according to any one of [1c] to [7c], wherein the thickness of the biaxially oriented film layer is 5 ⁇ m or more and 100 ⁇ m or less.
  • the present invention can also take the following forms:
  • a biaxially oriented polypropylene film having a biaxially oriented film layer containing a propylene-based polymer A biaxially oriented polypropylene film, in which the amount of structural units derived from ⁇ -olefins other than propylene contained in the biaxially oriented polypropylene film is 0.05 mol % or more and 50.0 mol % or less, when the total amount of structural units derived from monomers contained in the biaxially oriented polypropylene film is taken as 100 mol %.
  • the content of the homopolypropylene (A) in the surface resin layer is 75% by mass or more and 100% by mass or less, when the entire surface resin layer is 100% by mass.

Abstract

Un film de polypropylène à orientation biaxiale (100) est pourvu d'une couche de film à orientation biaxiale (101) contenant un polymère de propylène et a un taux de cristallinité d'au moins 38 % à 165 °C ou moins, tel que déterminé par calorimétrie différentielle à balayage.
PCT/JP2023/034574 2022-09-28 2023-09-22 Film de polypropylène à orientation biaxiale, emballage pour aliment et emballage alimentaire WO2024070972A1 (fr)

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
JP2022155359A JP2024049096A (ja) 2022-09-28 2022-09-28 二軸延伸ポリプロピレンフィルム、食品用包装体および食品包装体
JP2022-155360 2022-09-28
JP2022155372A JP2024049107A (ja) 2022-09-28 2022-09-28 二軸延伸ポリプロピレンフィルム、食品用包装体および食品包装体
JP2022-155365 2022-09-28
JP2022155365A JP2024049102A (ja) 2022-09-28 2022-09-28 二軸延伸ポリプロピレンフィルム、食品用包装体および食品包装体
JP2022-155372 2022-09-28
JP2022-155359 2022-09-28
JP2022155360A JP2024049097A (ja) 2022-09-28 2022-09-28 二軸延伸ポリプロピレンフィルム、食品用包装体および食品包装体
JP2022-155368 2022-09-28
JP2022155368A JP2024049105A (ja) 2022-09-28 2022-09-28 二軸延伸ポリプロピレンフィルム、食品用包装体および食品包装体

Publications (1)

Publication Number Publication Date
WO2024070972A1 true WO2024070972A1 (fr) 2024-04-04

Family

ID=90477702

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/034574 WO2024070972A1 (fr) 2022-09-28 2023-09-22 Film de polypropylène à orientation biaxiale, emballage pour aliment et emballage alimentaire

Country Status (1)

Country Link
WO (1) WO2024070972A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000273202A (ja) * 1999-03-25 2000-10-03 Tokuyama Corp ポリプロピレンフィルム
JP2014051658A (ja) * 2012-08-09 2014-03-20 Toyobo Co Ltd ポリプロピレンフィルム
JP2020007445A (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
JP2020007443A (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
JP2020128263A (ja) * 2017-09-06 2020-08-27 旭化成株式会社 ラップフィルム及びラップフィルム巻回体
JP2021028394A (ja) * 2018-11-01 2021-02-25 東レ株式会社 ポリプロピレンフィルム、および離型フィルム

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000273202A (ja) * 1999-03-25 2000-10-03 Tokuyama Corp ポリプロピレンフィルム
JP2014051658A (ja) * 2012-08-09 2014-03-20 Toyobo Co Ltd ポリプロピレンフィルム
JP2020128263A (ja) * 2017-09-06 2020-08-27 旭化成株式会社 ラップフィルム及びラップフィルム巻回体
JP2020007445A (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
JP2020007443A (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
JP2021028394A (ja) * 2018-11-01 2021-02-25 東レ株式会社 ポリプロピレンフィルム、および離型フィルム

Similar Documents

Publication Publication Date Title
JP7205462B2 (ja) 二軸配向ポリプロピレンフィルム
JP7480401B2 (ja) 食品用包装フィルムおよび食品用包装体
WO2018181011A1 (fr) Film de résine de polypropylène à orientation biaxiale
JP2023010777A (ja) 食品用包装フィルムおよび食品用包装体
WO2019244708A1 (fr) Film multicouche à base de polypropylène
WO2015087990A1 (fr) Film multicouche non étiré à base de polyoléfine
JP2022186744A (ja) 食品用包装フィルムおよび食品用包装体
JP2023121783A (ja) 食品用包装フィルムおよび食品用包装体
US20230415463A1 (en) Polypropylene film, laminate, packaging material, and packing body
WO2024070972A1 (fr) Film de polypropylène à orientation biaxiale, emballage pour aliment et emballage alimentaire
WO2024070975A1 (fr) Film de polypropylène étiré biaxialement, corps d'emballage alimentaire et aliment emballé
JP2024049097A (ja) 二軸延伸ポリプロピレンフィルム、食品用包装体および食品包装体
US20230212361A1 (en) Biaxially oriented polypropylene film
JP2024049096A (ja) 二軸延伸ポリプロピレンフィルム、食品用包装体および食品包装体
JP2024049094A (ja) 二軸延伸ポリプロピレンフィルム、食品用包装体および食品包装体
JP2024049105A (ja) 二軸延伸ポリプロピレンフィルム、食品用包装体および食品包装体
JP2024049107A (ja) 二軸延伸ポリプロピレンフィルム、食品用包装体および食品包装体
JP2024049102A (ja) 二軸延伸ポリプロピレンフィルム、食品用包装体および食品包装体
WO2024070981A1 (fr) Film de polypropylène étiré biaxialement, emballage pour aliment et emballage alimentaire
WO2024070894A1 (fr) Film d'emballage, matériau d'emballage et emballage alimentaire
WO2024070896A1 (fr) Film d'emballage, matériau d'emballage et emballage alimentaire
TW202413113A (zh) 雙軸延伸聚丙烯膜、食品用包裝體以及食品包裝體
TW202413112A (zh) 雙軸延伸聚丙烯膜、食品用包裝體以及食品包裝體
JP2024049113A (ja) 二軸延伸ポリプロピレンフィルム、食品用包装体および食品包装体
JP2024049108A (ja) 二軸延伸ポリプロピレンフィルム、食品用包装体および食品包装体