WO2023032596A1 - 多層フィルム、包装材及び包装体 - Google Patents
多層フィルム、包装材及び包装体 Download PDFInfo
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- WO2023032596A1 WO2023032596A1 PCT/JP2022/030163 JP2022030163W WO2023032596A1 WO 2023032596 A1 WO2023032596 A1 WO 2023032596A1 JP 2022030163 W JP2022030163 W JP 2022030163W WO 2023032596 A1 WO2023032596 A1 WO 2023032596A1
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- Prior art keywords
- propylene
- layer
- ethylene
- multilayer film
- mass
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- 239000005022 packaging material Substances 0.000 title claims description 34
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 86
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 86
- 239000011347 resin Substances 0.000 claims abstract description 52
- 229920005989 resin Polymers 0.000 claims abstract description 52
- 229920001577 copolymer Polymers 0.000 claims abstract description 37
- 229920001384 propylene homopolymer Polymers 0.000 claims abstract description 35
- 238000002844 melting Methods 0.000 claims abstract description 34
- 230000008018 melting Effects 0.000 claims abstract description 34
- 229920001400 block copolymer Polymers 0.000 claims abstract description 33
- 229920001971 elastomer Polymers 0.000 claims abstract description 32
- 239000000806 elastomer Substances 0.000 claims abstract description 31
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 55
- 239000005977 Ethylene Substances 0.000 claims description 55
- 239000000463 material Substances 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 7
- 229920006378 biaxially oriented polypropylene Polymers 0.000 claims description 5
- 239000011127 biaxially oriented polypropylene Substances 0.000 claims description 5
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 104
- 229920001155 polypropylene Polymers 0.000 description 22
- 238000000034 method Methods 0.000 description 17
- -1 polypropylene Polymers 0.000 description 17
- 239000004743 Polypropylene Substances 0.000 description 16
- 238000002156 mixing Methods 0.000 description 15
- 238000011282 treatment Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 12
- 239000000155 melt Substances 0.000 description 12
- 238000007789 sealing Methods 0.000 description 11
- 238000004806 packaging method and process Methods 0.000 description 8
- 229920005604 random copolymer Polymers 0.000 description 8
- 239000000565 sealant Substances 0.000 description 8
- 239000012790 adhesive layer Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 238000000113 differential scanning calorimetry Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 238000010030 laminating Methods 0.000 description 5
- 229920006267 polyester film Polymers 0.000 description 5
- 239000011888 foil Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 230000001954 sterilising effect Effects 0.000 description 4
- 238000004659 sterilization and disinfection Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 239000012968 metallocene catalyst Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000004711 α-olefin Substances 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229920006233 biaxially oriented polyamide Polymers 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000009820 dry lamination Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 239000005026 oriented polypropylene Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 239000011954 Ziegler–Natta catalyst Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000012685 gas phase polymerization Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 235000021485 packed food Nutrition 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920006124 polyolefin elastomer Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
Definitions
- the present invention relates to multilayer films, packaging materials and packages. Specifically, the present invention is excellent in heat resistance, cold shock resistance and low-temperature sealing properties, and can be suitably used as a sealant film for packaging bags for harsh treatments such as boiling water treatment and retort treatment.
- the present invention relates to a polypropylene-based multi-layer sealant film that can be suitably used for packaging materials composed of raw materials, and to a packaging material and a packaging bag obtained by using the polypropylene-based multi-layer sealant film.
- Polypropylene film has excellent rigidity and heat resistance, and is inexpensive, so it is sometimes used as a sealant film in various packaging materials such as food packaging.
- Patent Document 1 discloses a polypropylene-based composite film composed of three layers, wherein an intermediate layer is composed of a propylene/ethylene block copolymer, and both surface layers are composed of a propylene-based random copolymer. system composite films have been proposed.
- Polypropylene multilayer films are required to have heat resistance that can withstand retort processing, etc., in which pressure treatment is performed at a high temperature of 120 to 135 ° C for sterilization and sterilization, and cold impact resistance that does not break even when stored at low temperatures. It is In addition, in recent years, with the diversification of packaging materials, various materials have been used for base films, and low-temperature sealing properties have been required for polypropylene-based multilayer sealant films. However, the current situation is that it is difficult for conventional polypropylene-based multilayer sealant films to achieve a good balance between excellent heat resistance, cold impact resistance, and low-temperature sealability.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a polypropylene-based multilayer film capable of achieving excellent heat resistance, cold impact resistance, and low-temperature sealability at a high level in a well-balanced manner. and Another object of the present invention is to provide a packaging material and a packaging body obtained by using the multilayer film.
- the heat seal layer is mixed with a propylene homopolymer (A) and a propylene-based resin (B) having a melting point of 132 to 150° C. in predetermined amounts, and this is mixed with propylene.
- A propylene homopolymer
- B propylene-based resin
- the inventors have found that it is important to laminate a layer containing an ethylene block copolymer (C) and an ethylene/propylene copolymer elastomer (D), and have completed the present invention.
- a multilayer film according to one aspect of the present invention contains 70 to 10% by mass of a propylene homopolymer (A) and 30 to 90% by mass of a propylene-based resin (B) having a melting point of 132 to 150°C.
- a first layer, which is a layer, and a second layer containing a propylene/ethylene block copolymer (C) and an ethylene/propylene copolymer elastomer (D) are provided in this order.
- the first layer contains the propylene homopolymer (A) and the propylene-based resin (B) having a melting point of 132 to 150° C. in a specific ratio
- the second layer contains propylene.
- - Contains an ethylene block copolymer (C) and an ethylene/propylene copolymer elastomer (D).
- C ethylene block copolymer
- D ethylene/propylene copolymer elastomer
- Such a composite effect cannot be obtained when a propylene-ethylene block copolymer is used for the intermediate layer and a propylene-based random copolymer is used for the outer layer (for example, Patent Document 1 above). This is a favorable effect especially in retort processing applications.
- the second layer may contain 90 to 50% by mass of the propylene/ethylene block copolymer (C) and 10 to 50% by mass of the ethylene/propylene copolymer elastomer (D). This makes it easier to obtain even better impact resistance even during low-temperature storage.
- the thickness of the first layer may be 8-30% based on the thickness of the multilayer film. This makes it easy to obtain low-temperature sealability while maintaining cold impact resistance.
- the multilayer film comprises the first layer, the second layer, the propylene homopolymer (A), and the third layer containing the propylene-based resin (B) having a melting point of 132 to 150°C. and , in that order. This makes it easy to suppress distortion and warpage of the multilayer film.
- the total thickness of the first layer and the third layer may be 16-42% based on the thickness of the multilayer film. This makes it easy to obtain low-temperature sealability while maintaining cold impact resistance.
- the thickness of the second layer may be 20 ⁇ m or more. This makes it easy to maintain the cold impact resistance of the film.
- a packaging material according to one aspect of the present invention includes the multilayer film described above and a base material.
- the substrate may be a biaxially oriented polypropylene film.
- a package according to one aspect of the present invention is made from the packaging material described above.
- a polypropylene-based multilayer film capable of achieving excellent heat resistance, cold impact resistance, and low-temperature sealability at a high level in a well-balanced manner. That is, according to the present invention, heat resistance that can withstand retort treatment in which sterilization and sterilization are performed by performing pressure treatment at a high temperature of 120 to 135 ° C., cold impact resistance that does not break even during low-temperature storage, and low-temperature sealability. It is possible to provide a polypropylene-based multilayer film that is excellent in Moreover, according to this invention, the packaging material and packaging body obtained using the said multilayer film can be provided.
- FIG. 1 is a cross-sectional view of a multilayer film according to one embodiment of the invention.
- FIG. 2 is a cross-sectional view of a multilayer film according to another embodiment of the invention.
- FIG. 3 is a cross-sectional view of a packaging material according to one embodiment of the present invention.
- FIG. 4 is a cross-sectional view of a packaging material according to another embodiment of the invention.
- FIG. 1 is a cross-sectional view of a multilayer film according to one embodiment of the invention.
- the multilayer film 10 comprises a first layer 1 and a second layer 2 in this order.
- FIG. 2 is a cross-sectional view of a multilayer film according to another embodiment of the invention.
- the multilayer film 11 comprises a first layer 1, a second layer 2 and a third layer 3 in this order.
- the multilayer film can be used as a polypropylene-based unstretched sealant film.
- the first layer contains a propylene homopolymer (A) and a propylene-based resin (B) having a melting point of 132-150°C.
- a propylene homopolymer (A) having a high melting point together with the propylene-based resin (B) having a moderately lower melting point, both excellent heat resistance and heat sealability can be achieved.
- the first layer is a heat seal layer (seal layer), and when the multilayer film further comprises a third layer, the first layer can be referred to as an outer layer (first outer layer).
- the propylene homopolymer (A) can be obtained by homopolymerizing propylene using, for example, a Ziegler-Natta catalyst, a metallocene catalyst, or a half-metallocene catalyst. By containing the propylene homopolymer (A) in the first layer, excellent heat resistance can be imparted to the first layer.
- the melting point of the propylene homopolymer (A) is above the melting point of the propylene-based resin (B).
- the propylene homopolymer (A) those having a melting initiation temperature of 150°C or higher and a melting point of 155°C or higher when differential scanning calorimetry (JIS K 7121) is performed can be used. Those having both the melting initiation temperature and the melting point within this range have excellent heat resistance and, for example, are less likely to fuse on the inner surface of the packaging bag after being subjected to high-temperature retort treatment.
- melt flow rate MFR: ISO 1133
- temperature 230°C, load 2.16 kg in the range of 2.0 to 7.0 g/10 minutes
- melt flow rate is equal to or higher than the lower limit
- the load on the extruder during molding is reduced, the processing speed is less likely to decrease, and excellent productivity can be easily maintained.
- melt flow rate is equal to or lower than the upper limit
- the first layer tends to have excellent impact resistance.
- Propylene resin (B) As the propylene-based resin (B), those having a melting point in the range of 132 to 150° C. when measured by differential scanning calorimetry (JIS K 7121) can be used. By using a material having a melting point within this range, it is possible to achieve both excellent heat resistance and excellent low-temperature sealability in a well-balanced manner. From this point of view, the melting point may be 135-145°C. After the formation of the first layer, the melting point of the propylene-based resin (B) is measured by separating the first layer by a high-temperature LC method using, for example, graphite carbon as an adsorbent, and measuring the respective melting points. can do.
- JIS K 7121 differential scanning calorimetry
- the ethylene content of the propylene-based resin (B) may be 6% by mass or less.
- the ethylene content may be 5.5% by mass or less, and may be 4.5% by mass or less.
- the lower limit of the ethylene content is not particularly limited, it can be 3% by mass from the viewpoint of low-temperature sealing properties.
- the ethylene content of the propylene-based resin (B) is the ethylene content described on pages 412-413 of the Polymer Analysis Handbook (May 10, 2013, 3rd edition) edited by the Japan Society for Analytical Science, Polymer Analysis Council. It can be measured according to the quantitative determination method (IR method).
- the propylene-based resin (B) includes, for example, a propylene/ethylene random copolymer.
- the propylene/ethylene random copolymer is not particularly limited in its production method. can be obtained by copolymerizing. By using a propylene/ethylene random copolymer, a multilayer film having superior transparency can be obtained.
- the first layer contains 70-10% by mass of propylene homopolymer (A) and 30-90% by mass of propylene-based resin (B) having a melting point of 132-150°C.
- the content of the propylene homopolymer (A) is 10% by mass or more, excellent heat resistance can be maintained. From this point of view, the content may be 15% by mass or more, and may be 20% by mass or more.
- the content of the propylene homopolymer (A) is 70% by mass or less, that is, the content of the propylene-based resin (B) having a melting point of 132 to 150°C is at least 30% by mass or more, Excellent low-temperature sealability can be expressed.
- the content of the propylene homopolymer (A) may be 65% by mass or less, and may be 60% by mass or less.
- the content of the propylene-based resin (B) having a melting point of 132 to 150° C. may be 35 to 85% by mass, and may be 40 to 80% by mass.
- the second layer contains a propylene/ethylene block copolymer (C) and an ethylene/propylene copolymer elastomer (D). If the multilayer film further comprises a third layer, the second layer can be referred to as an intermediate layer.
- the propylene/ethylene block copolymer (C) is produced by producing the propylene polymer (C1) in the first step and then producing the ethylene-propylene copolymer (C2) by vapor phase polymerization in the second step. It is a copolymer that can be obtained.
- the propylene/ethylene block copolymer (C) is not a block copolymer in which a propylene polymer terminal and an ethylene-propylene copolymer terminal are bonded, but a kind of blend copolymer. By containing the propylene/ethylene block copolymer (C) in the second layer, it is easy to obtain excellent cold impact resistance.
- the propylene/ethylene block copolymer (C) used has a melt flow rate (MFR: ISO 1133) (temperature 230°C, load 2.16 kg) in the range of 0.5 to 2.5 g/10 minutes. be able to.
- MFR melt flow rate
- the melt flow rate is equal to or higher than the lower limit, the load on the extruder during molding is reduced, the processing speed is less likely to decrease, and excellent productivity can be easily maintained.
- the melt flow rate is equal to or lower than the upper limit, the second layer can easily obtain excellent cold impact resistance.
- the propylene/ethylene block copolymer (C) may contain 90 to 60% by mass of the propylene polymer (C1) and 10 to 40% by mass of the ethylene-propylene copolymer (C2). When each component is in this range, it is easy to obtain excellent cold impact resistance. From this point of view, the propylene/ethylene block copolymer (C) contains 87.5 to 65% by mass of the propylene polymer (C1) and 12.5 to 35% by mass of the ethylene-propylene copolymer (C2). It may contain 85 to 70% by mass of propylene polymer (C1) and 15 to 30% by mass of ethylene-propylene copolymer (C2).
- the ethylene content of the ethylene-propylene copolymer (C2) contained in the propylene-ethylene block copolymer (C) is not particularly limited, but can be in the range of 20 to 40% by mass.
- the ethylene content is equal to or less than the upper limit, the tackiness of the product can be suppressed, contamination due to the tackiness of the product during production is less likely to occur, and excellent productivity can be easily maintained.
- the ethylene content is at least the lower limit, excellent cold impact resistance can be easily obtained.
- the ethylene/propylene copolymer elastomer (D) can be prepared, for example, by a slurry polymerization method in the presence of an inert hydrocarbon such as hexane, heptane, or kerosene, or a liquefied ⁇ -olefin solvent such as propylene, or a gas phase polymerization method in the absence of a solvent. It can be obtained legally. Specifically, the ethylene/propylene copolymer elastomer (D) is obtained using a known multistage polymerization method.
- a polymerization-type high polymer can be obtained by copolymerizing propylene and ⁇ -olefin in the second stage reactor. It is a rubber-containing polypropylene resin.
- the ethylene/propylene copolymer elastomer (D) used has a melt flow rate (MFR: ISO 1133) (temperature: 230°C, load: 2.16 kg) in the range of 0.5 to 3.5 g/10 minutes. be able to.
- MFR melt flow rate
- the melt flow rate is equal to or higher than the lower limit, the load on the extruder during molding is reduced, the processing speed is less likely to decrease, and excellent productivity can be easily maintained.
- the melt flow rate is equal to or lower than the upper limit, the compatibility between the propylene/ethylene block copolymer (C) and the ethylene/propylene copolymer elastomer (D) is improved, resulting in reduced transparency and impact resistance. hard to do
- ethylene/propylene copolymer elastomer (D) those having a mass ratio of propylene content to ethylene content (propylene content/ethylene content) in the range of 1.5 to 4 can be used. Within the above range, it is easy to obtain excellent cold impact resistance.
- the second layer may contain 90 to 50% by mass of the propylene/ethylene block copolymer (C) and 10 to 50% by mass of the ethylene/propylene copolymer elastomer (D).
- the content of the propylene/ethylene block copolymer (C) is 50% by mass or more, excellent heat resistance can be easily maintained. From this point of view, the content may be 60% by mass or more, and may be 70% by mass or more.
- the content of the propylene/ethylene block copolymer (C) is 90% by mass or less, that is, the content of the ethylene/propylene copolymer elastomer (D) is at least 10% by mass or more. Cold impact resistance can be expressed.
- the content of the propylene/ethylene block copolymer (C) may be 87.5% by mass or less, and may be 85% by mass or less.
- the content of the ethylene/propylene copolymer elastomer (D) may be 12.5 to 40% by mass, and may be 15 to 30% by mass.
- the third layer contains the propylene homopolymer (A) and the propylene-based resin (B) having a melting point of 132 to 150° C. described in the first layer. Distortion and curling of the multilayer film can be easily suppressed by providing the third layer.
- the third layer can be referred to as an outer layer (second outer layer).
- the mixing ratio of the propylene homopolymer (A) and the propylene-based resin (B) having a melting point of 132 to 150° C. in the third layer there are no particular restrictions on the mixing ratio of the propylene homopolymer (A) and the propylene-based resin (B) having a melting point of 132 to 150° C. in the third layer, but from the viewpoint of suppressing film curl after film formation, the first It is preferable that the compounding ratio is the same as that of the layer.
- the thickness of the multilayer film is not particularly limited as long as it can be used as a film for packaging materials, for example, but if the film is too thick, there is a cost disadvantage.
- the thickness of the multilayer film can be 100 ⁇ m or less, and can be between 50 and 70 ⁇ m.
- the thickness of the first layer may be 8-30% based on the thickness of the multilayer film.
- the thickness ratio of the first layer is at least the lower limit, excellent low-temperature sealability can be easily obtained, and when it is at most the upper limit, a decrease in the heat seal strength of the film can be suppressed. Practicality is easily obtained. From this point of view, the thickness percentage of the first layer may be 10-25%, and may be 10-15%.
- the thickness of the second layer may be 20 ⁇ m or more. As a result, the cold impact resistance of the film is maintained, and the bag is less likely to break even during low-temperature storage. From this point of view, the thickness of the second layer may be 25 ⁇ m or more, and may be 30 ⁇ m or more. Although the upper limit of the thickness of the second layer is not particularly limited, it can be set to 50 ⁇ m because it is a cost disadvantage.
- the total thickness of the first layer and the third layer when providing the third layer may be 16 to 42% based on the thickness of the multilayer film.
- the ratio of the total thickness is at least the lower limit value, excellent low-temperature sealability can be easily obtained, and when it is at most the upper limit value, a decrease in the heat seal strength of the film can be suppressed, and practicality can be obtained. easy.
- the ratio of the total thickness of the first layer and the third layer may be 20-35%, and may be 20-30%.
- a method for producing a multilayer film is not particularly limited, and known methods can be used.
- a melt-kneading method using a general kneader such as a single-screw extruder, a twin-screw extruder, and a multi-screw extruder; Examples include a method of removing the solvent by heating.
- a single-screw extruder or a twin-screw extruder can be used in consideration of workability.
- the screw When a single-screw extruder is used, the screw includes a full-flight screw, a screw with a mixing element, a barrier-flight screw, a fluted screw, and the like, and these can be used without particular limitation.
- a twin-screw kneading device a co-rotating twin-screw extruder, a counter-rotating twin-screw extruder, etc. can be used, and the screw shape can be a full-flight screw, a kneading disk type, etc., without particular limitation. can be done.
- the obtained multilayer film may be subjected to a surface modification treatment to improve suitability for post-processing as necessary.
- a surface modification treatment for example, in order to improve the printability when using a single film or to improve the lamination aptitude when using a laminated film, the surface to be printed or the surface that comes into contact with the base material may be subjected to a surface modification treatment.
- the surface modification treatment include corona discharge treatment, plasma treatment, flame treatment, and other treatments that oxidize the film surface to generate functional groups, and modification treatment by a wet process that forms an easily adhesive layer by coating. .
- the multilayer film may be used as a single film or laminated with a substrate, and the method of use as a packaging material is not particularly limited.
- the packaging material can be provided with the multilayer film and the base material.
- a packaging material includes the above multilayer film, biaxially oriented polyamide film (ONy), biaxially oriented polyester film (PET), biaxially oriented polypropylene film (OPP), printed paper, metal foil ( It can be obtained by laminating at least one layer of substrates such as AL foil), transparent deposition film, etc. to form a laminate.
- a packaging material obtained by using a biaxially oriented polypropylene film (OPP) as a base material can be referred to as a same-material packaging material.
- FIG. 3 is a cross-sectional view of a packaging material according to one embodiment of the present invention.
- a packaging material 100 shown in the figure includes a multilayer film 10, an adhesive layer 4, a transparent deposited film 5, an adhesive layer 6, and a base film 7 in this order.
- FIG. 4 is a cross-sectional view of a packaging material according to another embodiment of the invention.
- a packaging material 101 shown in the figure comprises a multilayer film 11, an adhesive layer 4, a transparent deposited film 5, an adhesive layer 6, and a base film 7 in this order.
- the packaging materials 100 and 101 are used so that the sides of the multilayer films 10 and 11 face the contents.
- a conventional dry lamination method in which the films constituting the laminate are laminated using an adhesive can be suitably employed, but a method of extrusion laminating the multilayer film directly onto the substrate can also be used as necessary. can be adopted.
- the layered structure of the laminate is appropriately adjusted according to the required properties of the package, such as barrier properties that satisfy the shelf life of the packaged food, size and impact resistance that can handle the weight of the contents, and visibility of the contents. can do.
- the package may be made from the packaging material described above, and there are no particular restrictions on the manner of making the bag.
- the above packaging material laminate
- the above packaging material can be used for a flat bag, a three-sided bag, a folded bag, a gusseted bag, a standing pouch, a spouted pouch, a beaked pouch, etc., using a multilayer film as a sealing material.
- a first layer which is a heat seal layer, containing 70 to 10% by mass of a propylene homopolymer (A) and 30 to 90% by mass of a propylene-based resin (B) having a melting point of 132 to 150°C; a second layer containing a propylene/ethylene block copolymer (C) and an ethylene/propylene copolymer elastomer (D) in this order.
- a second layer containing a propylene/ethylene block copolymer (C) and an ethylene/propylene copolymer elastomer (D) in this order.
- [Invention 3] The multilayer film according to invention 1 or 2, wherein the thickness of the first layer is 8 to 30% based on the thickness of the multilayer film.
- [Invention 4] the first layer; the second layer; The multi-layer film according to invention 1, comprising in this order a propylene homopolymer (A) and a third layer containing a propylene-based resin (B) having a melting point of 132 to 150°C.
- [Invention 5] The multilayer film according to invention 4, wherein the total thickness of the first layer and the third layer is 16 to 42% based on the thickness of the multilayer film.
- [Invention 6] The multilayer film according to any one of Inventions 1 to 5, wherein the second layer has a thickness of 20 ⁇ m or more.
- FIG. 7 A packaging material comprising the multilayer film according to any one of Inventions 1 to 6 and a substrate.
- Example 1 A propylene homopolymer (A), a propylene resin (B), a propylene/ethylene block copolymer (C), and an ethylene/propylene copolymer elastomer (D) shown below were prepared.
- Polylene resin (B) A propylene/ethylene random copolymer having a melting point of 147° C. and an ethylene content of 3.4% by mass as determined by differential scanning calorimetry (JIS K 7121).
- the ethylene content was measured using the ethylene content quantification method ( IR method).
- a resin mixture was prepared by mixing 50% by mass of the propylene homopolymer (A) and 50% by mass of the propylene-based resin (B) in the form of pellets.
- a resin mixture was prepared by mixing 83% by mass of the propylene/ethylene block copolymer (C) and 17% by mass of the ethylene/propylene copolymer elastomer (D) in the form of pellets.
- Each resin mixture was supplied to an extruder whose temperature was controlled at 250°C, kneaded in a molten state, and a T-die extruder with a feed block gave a first layer thickness of 15 ⁇ m and a second layer thickness of 15 ⁇ m.
- a film of Example 1 was produced by laminating so that the thickness of the layers was 45 ⁇ m.
- Example 2 A film of Example 2 was produced in the same manner as in Example 1, except that the mixing ratio of the propylene homopolymer (A) and the propylene-based resin (B) was changed as shown in Table 1.
- Example 3 A film of Example 3 was produced in the same manner as in Example 1, except that the mixing ratio of the propylene homopolymer (A) and the propylene-based resin (B) was changed as shown in Table 1.
- Example 4 A film of Example 4 was produced in the same manner as in Example 1, except that the following propylene-based resin (B') was used instead of the propylene-based resin (B).
- Propylene resin (B') A propylene/ethylene random copolymer having a melting point of 133° C. and an ethylene content of 5.8% by mass as determined by differential scanning calorimetry (JIS K 7121).
- Example 5 The film of Example 5 was prepared in the same manner as in Example 1, except that the mixing ratio of the propylene/ethylene block copolymer (C) and the ethylene/propylene copolymer elastomer (D) was changed as shown in Table 1. was made.
- Example 6 For forming the first layer and the third layer, a resin mixture was prepared by mixing 50% by mass of propylene homopolymer (A) and 50% by mass of propylene-based resin (B) in the form of pellets.
- a resin mixture was prepared by mixing 83% by mass of the propylene/ethylene block copolymer (C) and 17% by mass of the ethylene/propylene copolymer elastomer (D) in the form of pellets.
- Each resin mixture is supplied to an extruder controlled at 250 ° C., kneaded in a molten state, and the thickness of the first layer and the third layer is adjusted by a T-die extruder having a feed block.
- a film of Example 6 was produced by laminating so that the thickness of the second layer was 10 ⁇ m and the thickness of the second layer was 40 ⁇ m.
- Example 7 A film of Example 7 was produced in the same manner as in Example 6, except that the mixing ratio of the propylene homopolymer (A) and the propylene-based resin (B) was changed as shown in Table 1.
- Example 8 A film of Example 8 was produced in the same manner as in Example 6, except that the mixing ratio of the propylene homopolymer (A) and the propylene-based resin (B) was changed as shown in Table 1.
- Example 9 A film of Example 9 was prepared in the same manner as in Example 6, except that the mixing ratio of the propylene/ethylene block copolymer (C) and the ethylene/propylene copolymer elastomer (D) was changed as shown in Table 1. was made.
- Comparative example 1 A film of Comparative Example 1 was produced in the same manner as in Example 1, except that the first layer was formed using only the propylene homopolymer (A).
- Comparative example 2 A film of Comparative Example 2 was produced in the same manner as in Example 1, except that the mixing ratio of the propylene homopolymer (A) and the propylene-based resin (B) was changed as shown in Table 2.
- Comparative Example 3 A film of Comparative Example 3 was produced in the same manner as in Example 1, except that the first layer was formed using only the propylene-based resin (B).
- Example 5 Example 1 except that the following elastomer resin was used instead of the propylene-based resin (B), and the mixing ratio of the propylene homopolymer (A) and the elastomer resin was changed as shown in Table 2.
- a film of Comparative Example 5 was produced in the same manner as above.
- (elastomer resin) It is an olefin-based elastomer using a metallocene catalyst, using ethylene as a main monomer and butene-1 as a comonomer, and having a melt flow rate (MFR: ISO 1133) (temperature: 190°C, load: 2.16 kg) of 3.6 g/ Elastomer resin that is 10 minutes.
- Comparative Example 6 A film of Comparative Example 6 was produced in the same manner as in Example 1, except that the second layer was formed using only the propylene/ethylene block copolymer (C).
- a biaxially oriented polyester film (PET) with a thickness of 12 ⁇ m, an AL foil with a thickness of 9 ⁇ m, a biaxially oriented polyamide film (ONy) with a thickness of 15 ⁇ m, and the film (polypropylene film) obtained in each example were urethane-based
- a laminate having the following structure was prepared by laminating by an ordinary dry lamination method using an adhesive. If the film had a first layer, it was adhered to the ONy with the first layer facing out.
- Laminate structure PET/adhesive/AL foil/adhesive/ONy/adhesive/polypropylene film
- the polypropylene films of this laminate were sealed using a heat sealer manufactured by Tester Sangyo Co., Ltd. at a sealing pressure of 0.2 MPa. Heat-sealing was performed at a sealing temperature of 140° C. to 160° C. in increments of 5° C. under conditions of a sealing time of 1 second and a sealing width of 5 mm.
- the polypropylene-based multilayer film of the present invention achieves high levels of heat resistance, cold impact resistance, and low-temperature sealing properties, and can be suitably used as a sealant film for retort packaging.
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Abstract
Description
図1は、本発明の一実施形態に係る多層フィルムの断面図である。多層フィルム10は、第一の層1と、第二の層2と、をこの順に備える。図2は、本発明の他の実施形態に係る多層フィルムの断面図である。多層フィルム11は、第一の層1と、第二の層2と、第三の層3と、をこの順に備える。多層フィルムは、ポリプロピレン系無延伸シーラントフィルムとして用いることができる。
第一の層は、プロピレン単独重合体(A)、及び融点が132~150℃であるプロピレン系樹脂(B)を含有する。融点の高いプロピレン単独重合体(A)と、それよりも適度に融点の低いプロピレン系樹脂(B)とを併用することで、優れた耐熱性及びヒートシール性を両立することができる。第一の層はヒートシール層(シール層)であり、多層フィルムが第三の層を更に備える場合、第一の層は外層(第一の外層)と言うことができる。
プロピレン単独重合体(A)は、例えばチーグラー・ナッタ型触媒、メタロセン触媒、又はハーフメタロセン触媒を用いて、プロピレンを単独重合する方法により得ることができる。第一の層がプロピレン単独重合体(A)を含有することにより、第一の層に優れた耐熱性を付与することができる。プロピレン単独重合体(A)の融点は、プロピレン系樹脂(B)の融点超である。
プロピレン系樹脂(B)としては、示差走査熱量測定(JIS K 7121)をした際の、融点が132~150℃の範囲であるものを用いることができる。融点がこの範囲内であるものを用いることで、優れた耐熱性と優れた低温シール性をバランスよく両立することができる。この観点から、当該融点は135~145℃であってもよい。なお、第一の層形成後の、プロピレン系樹脂(B)の融点は、例えばグラファイト炭素を吸着材として用いる高温LC法により、第一の層を分離し、それぞれの融点を測定することにより測定することができる。
第二の層は、プロピレン・エチレンブロック共重合体(C)及びエチレン・プロピレン共重合体エラストマー(D)を含有する。多層フィルムが第三の層を更に備える場合、第二の層は中間層と言うことができる。
プロピレン・エチレンブロック共重合体(C)は、第一工程でプロピレン重合体(C1)を製造し、次いで、第二工程で気相重合によりエチレン-プロピレン共重合体(C2)を製造することで得ることができる共重合体である。プロピレン・エチレンブロック共重合体(C)は、プロピレン重合体末端とエチレン-プロピレン共重合体末端が結合されたブロック共重合体ではなく、一種のブレンド系の共重合体である。第二の層がプロピレン・エチレンブロック共重合体(C)を含有することにより、優れた耐寒衝撃性を得易い。
エチレン・プロピレン共重合体エラストマー(D)は、例えばヘキサン、ヘプタン、灯油等の不活性炭化水素、又はプロピレン等の液化α-オレフィン溶媒の存在下で行うスラリー重合法、無溶媒下の気相重合法などにより得ることができる。具体的には、エチレン・プロピレン共重合体エラストマー(D)は、公知の多段重合法を用いて得られる。すなわち、第1段の反応器でプロピレン及び/又はプロピレン-α-オレフィン重合体を重合した後、第2段の反応器でプロピレンとα-オレフィンとの共重合により得ることができる、重合型高ゴム含有ポリプロピレン系樹脂である。第二の層がエチレン・プロピレン共重合体エラストマー(D)を含有することにより、更に優れた耐寒衝撃性を得易い。
第三の層は、第一の層にて述べた、プロピレン単独重合体(A)、及び融点が132~150℃であるプロピレン系樹脂(B)を含有する。第三の層を設けることで多層フィルムの歪みやカールを抑制し易くなる。第三の層は外層(第二の外層)ということができる。
多層フィルムの厚さは、例えば包装材料用のフィルムとして使用可能な範囲であれば特に制限されることはないが、フィルムが厚すぎる場合にはコストデメリットとなる。このため、多層フィルムの厚さは100μm以下とすることができ、50~70μmであってよい。
多層フィルムを製造する方法は特に制限されるものではなく、公知の方法を使用することが可能である。例えば、熱成形加工の方法としては、単軸スクリュー押出機、2軸スクリュー押出機、多軸スクリュー押出機等の一般的な混和機を用いた溶融混練方法、各成分を溶解又は分散混合後、溶剤を加熱除去する方法等が挙げられる。作業性を考慮した場合、単軸スクリュー押出機又は2軸スクリュー押出機を使用することができる。単軸押出機を用いる場合、スクリューとしては、フルフライトスクリュー、ミキシングエレメントを持つスクリュー、バリアフライトスクリュー、フルーテッドスクリュー等が挙げられ、これらを特に制限なく使用することができる。2軸混練装置としては、同方向回転2軸スクリュー押出機、異方向回転2軸スクリュー押出機等を用いることができ、またスクリュー形状としてはフルフライトスクリュー、ニーディングディスクタイプ等特に限定なく用いることができる。
多層フィルムは、単体フィルムとして用いてもよく、基材と積層して用いてもよく、その包装材としての使用方法は特に制限されるものではない。
包装体は上記の包装材から製袋されてよく、その製袋様式に関してはとくに制限されない。例えば上記の包装材(積層体)は、多層フィルムをシール材とする、平袋、三方袋、合掌袋、ガゼット袋、スタンディングパウチ、スパウト付きパウチ、ビーク付きパウチ等に用いることが可能である。
[発明1]
プロピレン単独重合体(A)70~10質量%、及び融点が132~150℃であるプロピレン系樹脂(B)30~90質量%を含有する、ヒートシール層である第一の層と、
プロピレン・エチレンブロック共重合体(C)及びエチレン・プロピレン共重合体エラストマー(D)を含有する第二の層と、をこの順に備える多層フィルム。
[発明2]
前記第二の層が、前記プロピレン・エチレンブロック共重合体(C)90~50質量%及び前記エチレン・プロピレン共重合体エラストマー(D)10~50質量%を含有する、発明1に記載の多層フィルム。
[発明3]
前記第一の層の厚さが、前記多層フィルムの厚さを基準として8~30%である、発明1又は2に記載の多層フィルム。
[発明4]
前記第一の層と、
前記第二の層と、
プロピレン単独重合体(A)及び融点が132~150℃であるプロピレン系樹脂(B)を含有する第三の層と、をこの順に備える、発明1に記載の多層フィルム。
[発明5]
前記第一の層及び前記第三の層の総厚が、前記多層フィルムの厚さを基準として16~42%である、発明4に記載の多層フィルム。
[発明6]
前記第二の層の厚さが20μm以上である、発明1~5のいずれか一に記載の多層フィルム。
[発明7]
発明1~6のいずれか一に記載の多層フィルムと、基材と、を備える包装材。
[発明8]
前記基材が、二軸延伸ポリプロピレンフィルムである、発明7に記載の包装材。
[発明9]
発明7又は8に記載の包装材から製袋された包装体。
(実施例1)
以下に示すプロピレン単独重合体(A)、プロピレン系樹脂(B)、プロピレン・エチレンブロック共重合体(C)、エチレン・プロピレン共重合体エラストマー(D)を準備した。
示差走査熱量測定(JIS K 7121)をした際の、融解開始温度が153℃、融点(融解ピーク温度)が159℃であり、かつメルトフローレート(MFR:ISO 1133)(温度230℃、荷重2.16kg)が3.0g/10分であるプロピレン単独重合体。
示差走査熱量測定(JIS K 7121)をした際の、融点が147℃、エチレン含有量が3.4質量%であるプロピレン・エチレンランダム共重合体。
メルトフローレート(MFR:ISO 1133)(温度230℃、荷重2.16kg)が1.8g/10分であり、プロピレン重合体81.5質量%及びエチレン-プロピレン共重合体18.5質量%を含有し、エチレン-プロピレン共重合体に含まれるエチレン含有量が36.2重量%であるプロピレン・エチレンブロック共重合体。
メルトフローレート(MFR:ISO 1133)(温度230℃、荷重2.16kg)が0.6g/10分であり、かつプロピレン含有量とエチレン含有量の質量比(プロピレン含有量/エチレン含有量)が2.7であるエチレン・プロピレン共重合体エラストマー。
第二の層形成用に、プロピレン・エチレンブロック共重合体(C)83質量%及びエチレン・プロピレン共重合体エラストマー(D)17質量%をペレット状態で混合した樹脂混合体を準備した。
各樹脂混合体を250℃に温調した押出機に供給し、溶融状態にて混錬して、フィードブロックを持つTダイ押出機にて第一の層の厚さが15μm、第二の層の厚さが45μmとなるように積層し、実施例1のフィルムを作製した。
プロピレン単独重合体(A)とプロピレン系樹脂(B)の混合割合を、表1に示すように変更したこと以外は、実施例1と同様にして実施例2のフィルムを作製した。
プロピレン単独重合体(A)とプロピレン系樹脂(B)の混合割合を、表1に示すように変更したこと以外は、実施例1と同様にして実施例3のフィルムを作製した。
プロピレン系樹脂(B)に代えて、以下のプロピレン系樹脂(B´)を用いたこと以外は、実施例1と同様にして実施例4のフィルムを作製した。
(プロピレン系樹脂(B´))
示差走査熱量測定(JIS K 7121)をした際の、融点が133℃、エチレン含有量が5.8質量%であるプロピレン・エチレンランダム共重合体。
プロピレン・エチレンブロック共重合体(C)とエチレン・プロピレン共重合体エラストマー(D)の混合割合を、表1に示すように変更したこと以外は、実施例1と同様にして実施例5のフィルムを作製した。
第一の層及び第三の層形成用に、プロピレン単独重合体(A)50質量%及びプロピレン系樹脂(B)50質量%をペレット状態で混合した樹脂混合体を準備した。
第二の層形成用に、プロピレン・エチレンブロック共重合体(C)83質量%及びエチレン・プロピレン共重合体エラストマー(D)17質量%をペレット状態で混合した樹脂混合体を準備した。
各樹脂混合体を250℃に温調した押出機に供給し、溶融状態にて混錬して、フィードブロックを持つTダイ押出機にて第一の層と第三の層の厚さがそれぞれ10μm、第二の層の厚さが40μmとなるように積層し、実施例6のフィルムを作製した。
プロピレン単独重合体(A)とプロピレン系樹脂(B)の混合割合を、表1に示すように変更したこと以外は、実施例6と同様にして実施例7のフィルムを作製した。
プロピレン単独重合体(A)とプロピレン系樹脂(B)の混合割合を、表1に示すように変更したこと以外は、実施例6と同様にして実施例8のフィルムを作製した。
プロピレン・エチレンブロック共重合体(C)とエチレン・プロピレン共重合体エラストマー(D)の混合割合を、表1に示すように変更したこと以外は、実施例6と同様にして実施例9のフィルムを作製した。
プロピレン単独重合体(A)のみを用いて第一の層を形成したこと以外は、実施例1と同様にして比較例1のフィルムを作製した。
プロピレン単独重合体(A)とプロピレン系樹脂(B)の混合割合を、表2に示すように変更したこと以外は、実施例1と同様にして比較例2のフィルムを作製した。
プロピレン系樹脂(B)のみを用いて第一の層を形成したこと以外は、実施例1と同様にして比較例3のフィルムを作製した。
プロピレン系樹脂(B)に代えて、以下のプロピレン系樹脂(B´´)を用いたこと、またプロピレン単独重合体(A)とプロピレン系樹脂(B´´)の混合割合を、表2に示すように変更したこと以外は、実施例1と同様にして比較例4のフィルムを作製した。
(プロピレン系樹脂(B´´))
示差走査熱量測定(JIS K 7121)をした際の、融点が131℃、エチレン含有量が23.7質量%であるプロピレン・エチレンランダム共重合体。
プロピレン系樹脂(B)に代えて、以下のエラストマー樹脂を用いたこと、またプロピレン単独重合体(A)とエラストマー樹脂の混合割合を、表2に示すように変更したこと以外は、実施例1と同様にして比較例5のフィルムを作製した。
(エラストマー樹脂)
メタロセン触媒を用いて、エチレンを主モノマーとしてコモノマーにブテン-1を用いたオレフィン系エラストマーであり、かつメルトフローレート(MFR:ISO 1133)(温度190℃、荷重2.16kg)が3.6g/10分であるエラストマー樹脂。
プロピレン・エチレンブロック共重合体(C)のみを用いて第二の層を形成したこと以外は、実施例1と同様にして比較例6のフィルムを作製した。
各例で得られたフィルムに対し以下の評価を行った。結果を表1及び表2に示す。
株式会社東洋精機製のフィルムインパクトテスターを用いて、温度-5℃、秤量1.5J、弾頭サイズ1/2インチの条件で、各例で得られたフィルムの低温保管時の衝撃強さを測定した。
厚さ12μmの二軸延伸ポリエステルフィルム(PET)、厚さ9μmのAL箔、厚さ15μmの二軸延伸ポリアミドフィルム(ONy)、及び各例で得られたフィルム(ポリプロピレン系フィルム)を、ウレタン系接着剤を用いて通常のドライラミネート法で貼り合せ、次の構成の積層体を作製した。フィルムが第一の層を有する場合は、第一の層が外層側になるようにしてONyと接着した。
積層体構成:PET/接着剤/AL箔/接着剤/ONy/接着剤/ポリプロピレン系フィルム
この積層体のポリプロピレン系フィルム同士を、テスター産業株式会社製ヒートシーラーを用いて、シール圧0.2MPa、シール時間1秒間、シール幅5mmの条件にて、シール温度140℃~160℃の間で5℃刻みにヒートシールした。各温度でのヒートシール後、シール部分を15mm幅×80mmに切出し、島津製作所株式会社製の引張試験機を用いて、引張速度300mm/minの条件にてヒートシール強度を測定した。ヒートシール強度が40N/15mm以上に達する温度が低いほど、低温シール性が良好であると判断した。
各例で得られたフィルムを用いて130mm×180mmの袋を作製し、内容物を入れずに袋の内面同士を密着させ、135℃で40分間レトルト処理を行った。その後、3辺のシール部をカットし、手でフィルムの剥離を行い、レトルト後融着評価を実施した。フィルム剥離が容易であるものをA、タック感を感じるものをB、剥離時にフィルムが変形するものをCと評価した。
Claims (9)
- プロピレン単独重合体(A)70~10質量%、及び融点が132~150℃であるプロピレン系樹脂(B)30~90質量%を含有する、ヒートシール層である第一の層と、
プロピレン・エチレンブロック共重合体(C)及びエチレン・プロピレン共重合体エラストマー(D)を含有する第二の層と、をこの順に備える多層フィルム。 - 前記第二の層が、前記プロピレン・エチレンブロック共重合体(C)90~50質量%及び前記エチレン・プロピレン共重合体エラストマー(D)10~50質量%を含有する、請求項1に記載の多層フィルム。
- 前記第一の層の厚さが、前記多層フィルムの厚さを基準として8~30%である、請求項1又は2に記載の多層フィルム。
- 前記第一の層と、
前記第二の層と、
プロピレン単独重合体(A)及び融点が132~150℃であるプロピレン系樹脂(B)を含有する第三の層と、をこの順に備える、請求項1に記載の多層フィルム。 - 前記第一の層及び前記第三の層の総厚が、前記多層フィルムの厚さを基準として16~42%である、請求項4に記載の多層フィルム。
- 前記第二の層の厚さが20μm以上である、請求項1又は2に記載の多層フィルム。
- 請求項1又は2に記載の多層フィルムと、基材と、を備える包装材。
- 前記基材が、二軸延伸ポリプロピレンフィルムである、請求項7に記載の包装材。
- 請求項7に記載の包装材から製袋された包装体。
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Citations (5)
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JPH09314770A (ja) * | 1996-05-31 | 1997-12-09 | Sumitomo Bakelite Co Ltd | Ptp包装用ポリプロピレン系シート |
US20080176016A1 (en) * | 2007-01-24 | 2008-07-24 | Otsuka Pharmaceutical Factory, Inc. | Pliable plastic film and container using the same |
JP2017132186A (ja) | 2016-01-29 | 2017-08-03 | 東レフィルム加工株式会社 | 耐衝撃性フィルムおよびそれを用いた積層体 |
JP2018079583A (ja) * | 2016-11-14 | 2018-05-24 | フタムラ化学株式会社 | ポリプロピレン系延伸シーラントフィルム及びこれを用いたフィルム積層体 |
JP2018094911A (ja) * | 2016-12-13 | 2018-06-21 | 日本ポリプロ株式会社 | 加飾フィルムおよびそれを用いた加飾成形体の製造方法 |
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JPH09314770A (ja) * | 1996-05-31 | 1997-12-09 | Sumitomo Bakelite Co Ltd | Ptp包装用ポリプロピレン系シート |
US20080176016A1 (en) * | 2007-01-24 | 2008-07-24 | Otsuka Pharmaceutical Factory, Inc. | Pliable plastic film and container using the same |
JP2017132186A (ja) | 2016-01-29 | 2017-08-03 | 東レフィルム加工株式会社 | 耐衝撃性フィルムおよびそれを用いた積層体 |
JP2018079583A (ja) * | 2016-11-14 | 2018-05-24 | フタムラ化学株式会社 | ポリプロピレン系延伸シーラントフィルム及びこれを用いたフィルム積層体 |
JP2018094911A (ja) * | 2016-12-13 | 2018-06-21 | 日本ポリプロ株式会社 | 加飾フィルムおよびそれを用いた加飾成形体の製造方法 |
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