JP5737560B2 - Easy-open coextruded multilayer film and package using the same - Google Patents
Easy-open coextruded multilayer film and package using the same Download PDFInfo
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- JP5737560B2 JP5737560B2 JP2011005840A JP2011005840A JP5737560B2 JP 5737560 B2 JP5737560 B2 JP 5737560B2 JP 2011005840 A JP2011005840 A JP 2011005840A JP 2011005840 A JP2011005840 A JP 2011005840A JP 5737560 B2 JP5737560 B2 JP 5737560B2
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- 229920005989 resin Polymers 0.000 claims description 129
- 239000011347 resin Substances 0.000 claims description 129
- 239000000203 mixture Substances 0.000 claims description 44
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 31
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 31
- 229920001684 low density polyethylene Polymers 0.000 claims description 21
- 239000004702 low-density polyethylene Substances 0.000 claims description 21
- -1 polypropylene Polymers 0.000 claims description 19
- 239000004743 Polypropylene Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 229920001155 polypropylene Polymers 0.000 claims description 13
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 13
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 13
- 239000000155 melt Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- 229920005604 random copolymer Polymers 0.000 claims description 7
- 239000010410 layer Substances 0.000 description 108
- 230000000052 comparative effect Effects 0.000 description 30
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 17
- 238000000034 method Methods 0.000 description 12
- 238000007789 sealing Methods 0.000 description 12
- 238000001125 extrusion Methods 0.000 description 6
- 239000000565 sealant Substances 0.000 description 6
- 235000013305 food Nutrition 0.000 description 5
- 239000005977 Ethylene Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920001903 high density polyethylene Polymers 0.000 description 3
- 239000004700 high-density polyethylene Substances 0.000 description 3
- 239000005001 laminate film Substances 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 239000005022 packaging material Substances 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000003851 corona treatment Methods 0.000 description 2
- 208000028659 discharge Diseases 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001384 propylene homopolymer Polymers 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000004711 α-olefin Substances 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000011954 Ziegler–Natta catalyst Substances 0.000 description 1
- 239000004840 adhesive resin Substances 0.000 description 1
- 229920006223 adhesive resin Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 235000021549 curry roux Nutrition 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009820 dry lamination Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229920005684 linear copolymer Polymers 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012968 metallocene catalyst Substances 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000012748 slip agent Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000009823 thermal lamination Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Packages (AREA)
- Wrappers (AREA)
- Laminated Bodies (AREA)
Description
本発明は、食品や雑貨・医療用具等の易開封性包装材として好適に使用できる共押出多層フィルムと、この共押出多層フィルムを用いてなる包装体に関するものである。 The present invention relates to a coextruded multilayer film that can be suitably used as an easy-open packaging material for foods, sundries, medical devices, and the like, and a package using the coextruded multilayer film.
従来、食品や雑貨等を充填する包装体として、蓋が容易に開封できる易開封性包装容器が広く使用されている。これらの包装体は充填口に蓋材をヒートシールし密封して使用されるが、包装物を取り出す際には蓋材を剥がす必要がある為、容器と蓋材とを広い温度範囲で安定して密封でき、かつ剥がしやすいヒートシール強度を持つシーラントフィルムが必要である。 2. Description of the Related Art Conventionally, easy-open packaging containers whose lids can be easily opened have been widely used as packaging bodies for filling foods, sundries and the like. These packages are used by heat-sealing and sealing the lid material at the filling port, but it is necessary to remove the lid material when taking out the package, so the container and lid material are stable over a wide temperature range. It is necessary to have a sealant film that can be sealed and has a heat seal strength that is easy to peel off.
上記の問題を解決する方法として、特定の比率でポリプロピレン系樹脂とポリエチレン樹脂を混合したヒートシール層／エチレン系樹脂層からなる易開封性共押出多層フィルムが開示されている（例えば、特許文献１参照）。しかし前記特許文献１で提供された易開封性多層フィルムをシーラントフィルムとして使用した場合であっても、固形カレールウや、錠剤・医療用具等の包装において良く使用されるローレットシールなど、シール部に細かな凹凸のパターンが施される場合には、ヒートシール部分の食い込みが生じ、勢いよく剥がすと（高速剥離すると）部分的に力がかかり、フィルムの裂け、材破が発生するという問題がある。 As a method for solving the above problem, an easy-open coextrusion multilayer film composed of a heat seal layer / ethylene resin layer in which a polypropylene resin and a polyethylene resin are mixed at a specific ratio is disclosed (for example, Patent Document 1). reference). However, even when the easy-open multilayer film provided in Patent Document 1 is used as a sealant film, it is fine in the seal part such as a knurled seal that is often used in packaging of solid curry roux, tablets, medical devices, etc. When an uneven pattern is applied, there is a problem that the heat seal part bites in, and when it is peeled off vigorously (when peeled at a high speed), a partial force is applied and the film is torn and the material is broken.
ローレットシール用のシーラントフィルムとしては、例えば、高密度ポリエチレンからなる樹脂層に、直鎖状低密度ポリエチレンとその他特定のオレフィン系樹脂とを混合してなるヒートシール層を積層した多層フィルムが提供されている（例えば、特許文献２参照）。しかしながら、前記特許文献２で提供されたフィルムをシーラントフィルムとして用いた場合、広いシール温度への対応が不十分で、シール温度によるシール強度が不安定であることから精密な温度管理を必要とすることになり、汎用食品用途等への応用に制限がある。 As a sealant film for knurling, for example, a multilayer film is provided in which a heat seal layer obtained by mixing a linear low density polyethylene and other specific olefin resin is laminated on a resin layer made of high density polyethylene. (For example, refer to Patent Document 2). However, when the film provided in Patent Document 2 is used as a sealant film, precise temperature control is required because the seal strength due to the seal temperature is unstable due to insufficient response to a wide seal temperature. In other words, there is a limit to application to general-purpose food applications.
本発明の課題は、上記のような問題に鑑みなされたものであり、従来の易開封性包装材に求められている易開封性の性能を損なうことなく、広い温度範囲で安定して密閉でき、高速剥離時にもフィルムの裂け等が発生しないような共押出多層フィルムを提供することにある。 An object of the present invention is made in view of the above problems, and can be stably sealed in a wide temperature range without impairing the easy-open performance required for conventional easy-open packaging materials. Another object of the present invention is to provide a coextruded multilayer film that does not cause tearing of the film even during high-speed peeling.
本発明者らは、上記課題を解決するために鋭意研究した結果、ヒートシール層とこれと積層する樹脂層として、特定の物性値を有する樹脂混合物を使用し、且つ、フィルムの全厚とヒートシール層の厚み比率を調整することにより、広い温度範囲での密閉性と、高速剥離時での易開封性との両立が可能であることを見出し、本発明を完成した。 As a result of diligent research to solve the above-mentioned problems, the present inventors have used a resin mixture having specific physical property values as the heat seal layer and the resin layer laminated thereon, and the total thickness and heat of the film. By adjusting the thickness ratio of the sealing layer, it was found that the sealing property in a wide temperature range and the easy-opening property at the time of high-speed peeling were compatible, and the present invention was completed.
即ち、本発明は、１９０℃でのメルトフローレートが２．０〜１２ｇ／１０ｍｉｎであり、密度が０．９３０〜０．９５０ｇ／ｃｍ３である直鎖状低密度ポリエチレン（ａ１）を６０〜８５質量％と、２３０℃でのメルトフローレートが５．０〜１２ｇ／１０ｍｉｎのポリプロピレン（ａ２）を１５〜４０質量％とを混合してなる樹脂混合物を主成分とする樹脂層（Ａ）と、１９０℃でのメルトフローレートが１０〜５０ｇ／１０ｍｉｎであり、密度が０．９１５〜０．９３５ｇ／ｃｍ３である低密度ポリエチレン（ｂ１）５０〜６５質量％と、２３０℃でのメルトフローレートが２〜１５ｇ／１０ｍｉｎのプロピレン系樹脂（ｂ２）３５〜５０質量％とを混合してなる樹脂混合物を主成分とするヒートシール層（Ｂ）と、が隣接して積層されてなる共押出多層フィルムであって、フィルムの全厚が２０〜５０μｍであり、且つ前記ヒートシール層（Ｂ）の厚さがフィルム全厚の５〜１５％の範囲であることを特徴とする易開封性共押出多層フィルム、及び該フィルムを用いてなる包装体を提供するものである。 That is, the present invention provides a linear low density polyethylene (a1) having a melt flow rate at 190 ° C. of 2.0 to 12 g / 10 min and a density of 0.930 to 0.950 g / cm 3 of 60 to 60%. A resin layer (A) mainly composed of 85% by mass and a resin mixture obtained by mixing 15 to 40% by mass of polypropylene (a2) having a melt flow rate at 230 ° C. of 5.0 to 12 g / 10 min. The melt flow rate at 190 ° C. is 10 to 50 g / 10 min, the density is 0.915 to 0.935 g / cm 3 , 50 to 65 mass% of low density polyethylene (b1), and the melt flow at 230 ° C. A heat seal layer (B) mainly composed of a resin mixture obtained by mixing 35 to 50% by mass of a propylene resin (b2) having a rate of 2 to 15 g / 10 min is laminated adjacently. The coextruded multilayer film is characterized in that the total thickness of the film is 20 to 50 μm, and the thickness of the heat seal layer (B) is in the range of 5 to 15% of the total thickness of the film. An easily openable coextruded multilayer film and a package using the film are provided.
本発明の共押出多層フィルムは、広いシール温度範囲での安定的な密閉性と、易開封性とをバランスよく発現するものであり、易開封性シーラントフィルムとして好適に用いることができる。特に、シール部に細かな凹凸を有するローレットシール時においても、剥離時の力を分散させることが可能な基材層の構成になっていることから、フィルムの裂けや破れを防ぐことができる。従って、食品や玩具・医療用具等の容器の包装体、特には蓋材として好適である。 The coextruded multilayer film of the present invention expresses a stable sealing property in a wide sealing temperature range and an easy-open property in a well-balanced manner, and can be suitably used as an easily-openable sealant film. In particular, even when knurling with fine irregularities in the seal portion, the base material layer can disperse the force at the time of peeling, so that the film can be prevented from being torn or torn. Therefore, it is suitable as a package body for containers such as foods, toys and medical tools, particularly as a lid.
本発明の共押出多層フィルムは、少なくとも樹脂層（Ａ）とヒートシール層（Ｂ）とを有するものであり、それぞれの層を構成する樹脂として、特定の樹脂混合物を主成分としているものである。本発明において「主成分とする」とは、当該特定の樹脂混合物を、各層を形成する組成物全量に対して８５質量％以上含有する事を言うものであり、好ましくは、９５質量％以上が特定の樹脂混合物であることを言う。 The coextruded multilayer film of the present invention has at least a resin layer (A) and a heat seal layer (B), and has a specific resin mixture as a main component as a resin constituting each layer. . In the present invention, “main component” means that the specific resin mixture is contained in an amount of 85% by mass or more with respect to the total amount of the composition forming each layer, and preferably 95% by mass or more. Say a specific resin mixture.
本発明の共押出多層フィルムにおいて、樹脂層（Ａ）は１９０℃でのメルトフローレートが２．０〜１２ｇ／１０ｍｉｎであり、密度が０．９３０〜０．９５０ｇ／ｃｍ３である直鎖状低密度ポリエチレン（ａ１）を６０〜８５質量％と、２３０℃でのメルトフローレートが５．０〜１２ｇ／１０ｍｉｎのポリプロピレン（ａ２）を１５〜４０質量％とを混合してなる樹脂混合物を主成分とする。 In the coextruded multilayer film of the present invention, the resin layer (A) has a melt flow rate at 190 ° C. of 2.0 to 12 g / 10 min and a density of 0.930 to 0.950 g / cm 3. Mainly a resin mixture obtained by mixing 60 to 85% by mass of low density polyethylene (a1) and 15 to 40% by mass of polypropylene (a2) having a melt flow rate at 230 ° C. of 5.0 to 12 g / 10 min. Ingredients.
前記直鎖状低密度ポリエチレン（ａ１）は、エチレンとブテン−１、ヘキセン−１、オクテン−１等のα−オレフィンとの直鎖状の共重合体である。なかでも好ましいものとしては、メタロセン触媒を用いて製造されたエチレン−ブテン−１共重合体、エチレン−ヘキセン−１共重合体等であり、エチレン由来成分含有率が９０質量％以上のものが好ましく、９０〜９８質量％のものが特に好ましい。 The linear low density polyethylene (a1) is a linear copolymer of ethylene and an α-olefin such as butene-1, hexene-1, octene-1. Among these, ethylene-butene-1 copolymer, ethylene-hexene-1 copolymer and the like produced using a metallocene catalyst are preferable, and those having an ethylene-derived component content of 90% by mass or more are preferable. 90 to 98% by mass is particularly preferable.
前記直鎖状低密度ポリエチレン（ａ１）の１９０℃でのメルトフローレート（以下、ＭＦＲという）は２．０〜１２ｇ／１０ｍｉｎであることを必須とし、特に４．０〜７．０ｇ／１０ｍｉｎであることが好ましい。尚、ＭＦＲはＪＩＳ Ｋ７２１０（荷重２１．１８Ｎ）に準拠して測定された値である。ＭＦＲが２．０ｇ／１０ｍｉｎ未満では、後述するポリプロピレン（ａ２）と混合して用いる際に相分離しやすくなり、得られる多層フィルムの靭性に劣ることがある。又、ＭＦＲが１２ｇ／１０ｍｉｎを超えると、後述するヒートシール層（Ｂ）との共押出する際の樹脂流れの均一性にかけることになり、得られる多層フィルムの均質性に問題が生じる場合がある。 The linear low density polyethylene (a1) must have a melt flow rate (hereinafter referred to as MFR) at 190 ° C. of 2.0 to 12 g / 10 min, particularly 4.0 to 7.0 g / 10 min. Preferably there is. The MFR is a value measured according to JIS K7210 (load 21.18N). When the MFR is less than 2.0 g / 10 min, phase separation is likely to occur when mixed with polypropylene (a2) described later, and the toughness of the resulting multilayer film may be inferior. Moreover, when MFR exceeds 12 g / 10min, it will be applied to the uniformity of the resin flow at the time of co-extrusion with the heat seal layer (B) described later, and there may be a problem in the homogeneity of the resulting multilayer film. is there.
又、前記直鎖状低密度ポリエチレン（ａ１）の密度としては、０．９３０〜０．９５０ｇ／ｃｍ３であることを必須とし、特に０．９３５〜０．９４５の範囲であることが好ましい。 Further, the density of the linear low density polyethylene (a1) is required to be 0.930 to 0.950 g / cm 3 , particularly preferably in the range of 0.935 to 0.945.
本発明の樹脂層（Ａ）は、前記直鎖状低密度ポリエチレン（ａ１）に、２３０℃でのＭＦＲが５．０〜１２ｇ／１０ｍｉｎのポリプロピレン（ａ２）を併用することを特徴とする。この様なポリプロピレン（ａ２）を混合することによって、得られるフィルムの剛性を適度に向上させ、シール部に凹凸がある場合のシールの食い込みを防止すると共に、剥離時の力を分散させてフィルムの裂け等を防止する効果を発現させることができる。 The resin layer (A) of the present invention is characterized in that polypropylene (a2) having an MFR of 5.0 to 12 g / 10 min at 230 ° C. is used in combination with the linear low-density polyethylene (a1). By mixing such a polypropylene (a2), the rigidity of the obtained film is moderately improved, and when the seal portion has irregularities, the biting of the seal is prevented and the force at the time of peeling is dispersed to disperse the film. The effect of preventing tearing can be expressed.
前記ポリプロピレン（ａ２）は、プロピレンの単独重合体であり、好ましくは、マルチサイト触媒（チーグラー・ナッタ触媒）を用いて重合されたものである。又、ＭＦＲ（２３０℃）は５．０〜１２．０ｇ／１０分であるものを必須とし、好ましくは、７．０〜１０．０ｇ／１０分のものである。ＭＦＲがこの範囲であれば、フィルムの成膜性が向上し、又前記した直鎖状低密度ポリエチレン（ａ１）と混合した際に適度な海島構造を発現させることができることから、剥離時の力の分散効果が高くなる。 The polypropylene (a2) is a homopolymer of propylene, and is preferably polymerized using a multi-site catalyst (Ziegler-Natta catalyst). Further, the MFR (230 ° C.) must be 5.0 to 12.0 g / 10 min, preferably 7.0 to 10.0 g / 10 min. When the MFR is within this range, the film-forming property is improved, and an appropriate sea-island structure can be expressed when mixed with the above-described linear low-density polyethylene (a1). Increases the dispersion effect.
樹脂層（Ａ）は、前記直鎖状低密度ポリエチレン（ａ１）と前記ポリプロピレン（ａ２）とを（ａ１）／（ａ２）＝６０〜８５／１５〜４０（質量比）の範囲で混合した樹脂混合物を主成分とするものであり、特に（ａ１）／（ａ２）＝７０〜８０／２０〜３０（質量比）で混合したものを用いることが好ましい。直鎖状低密度ポリエチレン（ａ１）の使用割合が６０質量％未満ではポリプロピレンの割合が増えることによってフィルムが硬くなりすぎ、ローレットシール等の凹凸シールの場合のシール強度が不足したり、剥離時にフィルムの破れが生じたりすることがある。又、直鎖状低密度ポリエチレン（ａ１）の使用割合が８５質量％を超えると、フィルム全体の強度不足により剥離時にフィルムが裂ける事がある。 The resin layer (A) is a resin obtained by mixing the linear low-density polyethylene (a1) and the polypropylene (a2) in a range of (a1) / (a2) = 60 to 85/15 to 40 (mass ratio). It is a thing which has a mixture as a main component, It is preferable to use what was mixed especially by (a1) / (a2) = 70-80 / 20-30 (mass ratio). If the proportion of linear low-density polyethylene (a1) used is less than 60% by mass, the proportion of polypropylene increases and the film becomes too hard, resulting in insufficient sealing strength in the case of concave and convex seals such as knurled seals, and when peeling May be torn. Moreover, when the usage-amount of linear low density polyethylene (a1) exceeds 85 mass%, a film may tear at the time of peeling by insufficient strength of the whole film.
又、本発明において樹脂層（Ａ）は単一の層からなるものであっても、２層以上の多層構成からなるものであってよい。特に本発明においては樹脂層（Ａ）の全厚に占める割合が高いので、共押出法を用いる際のヒートシール層（Ｂ）との厚み調整を容易にするためには、２層以上の多層構成にすることが、均質性に優れる多層フィルムとなることから好ましいものである。このとき、２層以上の樹脂層（Ａ）を構成する樹脂混合物は、前述の直鎖状低密度ポリエチレン（ａ１）と前述のポリプロピレン（ａ２）とを特定割合の範囲で用いれば良く、全く同一の混合物であっても、それぞれのＭＦＲや密度が異なる樹脂の混合物、混合比率が異なる混合物等であってもよい。 In the present invention, the resin layer (A) may be composed of a single layer or may be composed of two or more layers. In particular, in the present invention, since the ratio of the resin layer (A) to the total thickness is high, in order to easily adjust the thickness with the heat seal layer (B) when using the coextrusion method, two or more layers are used. The constitution is preferable because a multilayer film having excellent homogeneity is obtained. At this time, the resin mixture constituting the two or more resin layers (A) may use the above-mentioned linear low-density polyethylene (a1) and the above-mentioned polypropylene (a2) in a specific ratio range, and is exactly the same. May be a mixture of resins having different MFRs and densities, a mixture having a different mixing ratio, or the like.
本発明の多層フィルムにおけるヒートシール層（Ｂ）は、１９０℃でのＭＦＲが１０〜５０ｇ／１０ｍｉｎであり、密度が０．９１５〜０．９３５ｇ／ｃｍ３である低密度ポリエチレン（ｂ１）５０〜６５質量％と、２３０℃でのＭＦＲが２〜１５ｇ／１０ｍｉｎのプロピレン系樹脂（ｂ２）を３５〜５０質量％とを混合してなる樹脂混合物を主成分とする。 The heat seal layer (B) in the multilayer film of the present invention has an MFR at 190 ° C. of 10 to 50 g / 10 min and a density of 0.915 to 0.935 g / cm 3. A resin mixture obtained by mixing 65% by mass and 35-50% by mass of a propylene-based resin (b2) having an MFR of 2 to 15 g / 10 min at 230 ° C. is a main component.
前記低密度ポリエチレン（ｂ１）としては、シングルサイト、マルチサイト何れの触媒を用いて得られたものであってもよい。一般にフィルム成形等の押出成形で用いられる低密度ポリエチレンは１９０℃でのＭＦＲが１〜８ｇ／１０ｍｉｎ程度であるが、本発明においては、より流動性の良好なＭＦＲが１０〜５０ｇ／１０ｍｉｎの低密度ポリエチレンを用いることが大きな特徴の一つである。この様な流動性に優れたポリエチレンを用いることで、シール面に凹凸があるような場合であっても、安定したシール強度が得られるようになる。特に好ましいＭＦＲの値は、２５〜４０ｇ／１０ｍｉｎの範囲である。 The low density polyethylene (b1) may be obtained using a single site or multisite catalyst. Generally, low density polyethylene used for extrusion molding such as film molding has an MFR at 190 ° C. of about 1 to 8 g / 10 min. However, in the present invention, the MFR with better fluidity is a low 10 to 50 g / 10 min. One of the major features is the use of density polyethylene. By using polyethylene having such excellent fluidity, a stable seal strength can be obtained even when the seal surface has irregularities. A particularly preferred MFR value is in the range of 25-40 g / 10 min.
又、前記低密度ポリエチレン（ｂ１）の密度としては、０．９１５〜０．９３５ｇ／ｃｍ３であることを必須とするが、特に０．９１５〜０．９２５の範囲であるものを用いることが、これと混合して使用するプロピレン系樹脂（ｂ２）と適度に混合し、フィルムの均質性を高めることができる。 Further, the density of the low density polyethylene (b1) is indispensable to be 0.915 to 0.935 g / cm 3 , and in particular, one having a range of 0.915 to 0.925 is used. It can be mixed with the propylene-based resin (b2) used by mixing with this to increase the homogeneity of the film.
前記プロピレン系樹脂（ｂ２）は２３０℃でのＭＦＲが２〜１５ｇ／１０ｍｉｎのものであれば良く、例えば、プロピレンとエチレン、ブテン等のその他のα−オレフィンとのブロック又はランダム共重合体が挙げられる。なかでも好ましいものとしては、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−ブテン−１ランダム共重合体等が挙げられる。これらプロピレン系樹脂（ｂ２）は単独で用いても、混合して用いても構わない。 The propylene-based resin (b2) may have a MFR of 2 to 15 g / 10 min at 230 ° C., and examples thereof include a block or random copolymer of propylene and other α-olefin such as ethylene and butene. It is done. Among them, preferred are propylene-ethylene random copolymer, propylene-ethylene-butene-1 random copolymer and the like. These propylene resins (b2) may be used alone or in combination.
本発明のヒートシール層（Ｂ）は、前記低密度ポリエチレン（ｂ１）と前記プロピレン系樹脂（ｂ２）とを（ｂ１）／（ｂ２）＝５０〜６５／３５〜５０（質量比）で混合した混合物を主成分とするものであり、好ましくは、（ｂ１）／（ｂ２）＝５０〜５５／４５〜５０の範囲で混合したものを使用することである。この範囲を満たさない場合には、ヒートシール温度によるシール強度の振れ幅が大きくなりやすく、汎用性にかけることがあり、特にプロピレン系樹脂（ｂ２）の使用割合が高い場合には、食品や玩具等の容器として汎用されるプロピレン系樹脂を最外層とする容器へのシール強度が高すぎる結果、高速剥離時にフィルムが裂けることが多くなる。 In the heat seal layer (B) of the present invention, the low-density polyethylene (b1) and the propylene-based resin (b2) were mixed at (b1) / (b2) = 50 to 65/35 to 50 (mass ratio). It is a thing which has a mixture as a main component, Preferably it is using what was mixed in the range of (b1) / (b2) = 50-55 / 45-50. If this range is not satisfied, the fluctuation range of the sealing strength due to the heat sealing temperature tends to increase, and this may be applied to generality. Especially when the proportion of the propylene resin (b2) used is high, food and toys As a result of the sealing strength of a container having a propylene-based resin widely used as a container such as the outermost layer being too high, the film often tears during high-speed peeling.
本発明の共押出多層フィルムの厚さ（全厚）としては、近年の包装材料の軽量化の観点と、易開封性の点より、２０〜５０μｍであり、なかでも２５〜４０μｍの範囲であることが好ましい。ヒートシール層（Ｂ）の厚さはフィルム全厚の５〜１５％の範囲であり、この範囲であると、ヒートシール強度が安定して適度な易開封性を示し、開封時のフィルムの裂けが起こりにくい。本発明の共押出多層フィルムは、ヒートシール層（Ｂ）の凝集破壊による易開封性発現を利用するものであるが、樹脂層（Ａ）へ力を分散させ、当該樹脂層（Ａ）をも容易に破壊できるように設計しており、そのため、ヒートシール層（Ｂ）が薄くても充分な開封性を発現することができる。 The thickness (total thickness) of the coextruded multilayer film of the present invention is from 20 to 50 μm, particularly from 25 to 40 μm from the viewpoint of weight reduction of recent packaging materials and easy opening. It is preferable. The thickness of the heat seal layer (B) is in the range of 5 to 15% of the total thickness of the film. If it is within this range, the heat seal strength is stable and shows an appropriate easy-opening property, and the film tears at the time of opening. Is unlikely to occur. The coextruded multilayer film of the present invention utilizes the easy-opening expression due to cohesive failure of the heat seal layer (B), but the force is dispersed in the resin layer (A), and the resin layer (A) is also dispersed. It is designed so that it can be easily broken. Therefore, even if the heat seal layer (B) is thin, sufficient openability can be expressed.
本発明の共押出多層フィルムには、樹脂層（Ａ）およびヒートシール層（Ｂ）のいずれかあるいは全ての層に他の熱可塑性樹脂、熱安定剤、帯電防止剤、アンチブロッキング剤、スリップ剤、防曇剤等を本発明の目的を損なわない範囲で添加しても良い。 In the co-extruded multilayer film of the present invention, any or all of the resin layer (A) and the heat seal layer (B) are provided with other thermoplastic resins, heat stabilizers, antistatic agents, antiblocking agents, and slip agents. Further, an antifogging agent or the like may be added within a range not impairing the object of the present invention.
本発明の共押出多層フィルムの製造方法としては、樹脂層（Ａ）とヒートシール層（Ｂ）とが隣接して積層される共押出積層成形法であることが必要であり、例えば、２台以上の押出機を用いて溶融押出する、共押出多層ダイス法、フィードブロック法等の種々の共押出法により溶融状態で樹脂層（Ａ）とヒートシール層（Ｂ）を積層した後、インフレーション、Ｔダイ・チルロール法等の方法で長尺巻フィルムに加工する方法が好ましく、Ｔダイを用いた共押出法がより好ましい。 The method for producing the coextruded multilayer film of the present invention needs to be a coextrusion lamination molding method in which the resin layer (A) and the heat seal layer (B) are laminated adjacent to each other. After the resin layer (A) and the heat seal layer (B) are laminated in a molten state by various coextrusion methods such as a coextrusion multilayer die method, a feed block method, etc., which are melt extruded using the above extruder, inflation, A method of processing into a long wound film by a method such as a T-die / chill roll method is preferred, and a co-extrusion method using a T-die is more preferred.
本発明の共押出多層フィルムの製造に際して樹脂層（Ａ）は、印刷の接着性や接着剤との接着性を向上させるために、表面処理を施すことが望ましい。 In the production of the coextruded multilayer film of the present invention, the resin layer (A) is preferably subjected to a surface treatment in order to improve the adhesiveness of printing and the adhesiveness with the adhesive.
この表面処理の方法は、本発明の共押出多層フィルムを連続的に処理でき、かつ、製膜時に巻き取る前に容易に実施でき、処理の度合いも任意に調整できるコロナ放電処理が望ましい。なお、表面処理に関しては加熱下または不活性ガスの雰囲気下でコロナ放電もしくはプラズマ放電等の効果促進手法を用いても良い。 The surface treatment method is preferably a corona discharge treatment that can continuously treat the coextruded multilayer film of the present invention, can be easily carried out before winding during film formation, and can arbitrarily adjust the degree of treatment. As for the surface treatment, an effect promoting method such as corona discharge or plasma discharge may be used under heating or in an inert gas atmosphere.
本発明の共押出多層フィルムをシーラントフィルムとして使用する際には、樹脂層（Ａ）上に任意の基材を積層接着する。この積層接着される基材としては、例えば、ポリエチレンテレフタレート、ポリプロピレン、ポリアミド、塩化ビニリデン樹脂、エチレンビニルアルコール共重合体等からなる基材が挙げられる。またこれらの積層接着する基材は単層に限らず多層に積層したもの等が任意に選択できる。この積層接着する基材は二軸延伸加工されたフィルムをラミネート加工等で積層接着することが望ましく、ラミネート加工としては、ドライラミネート、サーマルラミネート、押出ラミネート等任意の方法を用いることができる。また、接着性樹脂を介して、共押出ラミネートで積層しても良い。この基材の厚さは特に限定されるものではないが、熱封着性、易開封性に優れるラミネートフィルムが得られることから５〜３００μｍが好適である。 When the coextruded multilayer film of the present invention is used as a sealant film, an arbitrary base material is laminated and bonded onto the resin layer (A). Examples of the base material to be laminated and bonded include base materials made of polyethylene terephthalate, polypropylene, polyamide, vinylidene chloride resin, ethylene vinyl alcohol copolymer, and the like. In addition, the base material to be laminated and bonded is not limited to a single layer but can be arbitrarily selected from those laminated in multiple layers. The base material to be laminated and bonded is desirably laminated and bonded by laminating a biaxially stretched film. As the laminating process, any method such as dry lamination, thermal lamination, and extrusion lamination can be used. Moreover, you may laminate | stack by coextrusion lamination through adhesive resin. Although the thickness of this base material is not specifically limited, 5-300 micrometers is suitable from the laminated film which is excellent in heat sealing property and easy-opening property.
以下に実施例と比較例を挙げて、本発明を具体的に説明するが、本発明はこれらに限定されるものではない。尚、例中の部及び％は全て重量基準である EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these. In the examples, all parts and% are based on weight.
（１）易剥離性の評価
得られたフィルムの樹脂層（Ａ）側にウレタン系接着剤を使用して膜厚１２μｍの２軸延伸ポリエステルフィルムをラミネートして、ラミネートフィルムを作成した。得られたラミネートフィルムのヒートシール層を厚さ０．３ｍｍのポリプロピレンシートに合わせ、精密ヒートシーラー（テスター産業製）も用いて温度１３０〜１９０℃（１０℃刻み）、圧力０．２ＭＰａで幅１０ｍｍのシールバーにより、１．０秒間ヒートシールした後、放冷し、次いでヒートシールしたサンプルから１５ｍｍ幅の試験片を切り取り、２３℃、５０％ＲＨの恒温室において引張速度３００ｍｍ／分の条件で、万能型引張試験機（株式会社エー・アンド・ディー製）で１８０度方向に剥離して最大荷重を測定した。（単位：Ｎ／１５ｍｍ）
(1) Evaluation of easy peelability A biaxially stretched polyester film with a film thickness of 12 μm was laminated on the resin layer (A) side of the obtained film using a urethane adhesive to prepare a laminate film. Match the heat-seal layer of the resulting laminate film to a polypropylene sheet with a thickness of 0.3 mm and use a precision heat sealer (manufactured by Tester Sangyo) at a temperature of 130 to 190 ° C. (in 10 ° C. increments), a pressure of 0.2 MPa and a width of 10 mm. After heat-sealing with a seal bar for 1.0 second, the sample was allowed to cool, and then a 15 mm wide test piece was cut out from the heat-sealed sample, and the tensile rate was 300 mm / min in a constant temperature room at 23 ° C. and 50% RH. The maximum load was measured after peeling in a 180 ° direction with a universal tensile tester (manufactured by A & D Co., Ltd.). (Unit: N / 15mm)
（２）高速剥離試験
上記シートに上記ラミネートフィルムのヒートシール層を重ね合わせ、８８角、１．２ｍｍピッチのローレットシールを包装機を使用して行い、温度１８０℃、時間１．０秒間、荷重１００ｋｇの条件でヒートシールサンプルを得た。このヒートシールサンプルから１５ｍｍ幅の試験片を切り取り、２３℃、５０％ＲＨの恒温室において引張速度３００ｍｍ／分の条件で、万能型引張試験機（株式会社エー・アンド・ディー製）で１８０度方向に剥離して最大荷重を測定（単位：Ｎ／１５ｍｍ）するとともに、ヒートシールサンプルの角から容器の蓋を剥がすようにしてフィルムを勢いよく剥がし高速剥離させ、フィルムの裂け、材破の有無を確認し、裂けの発生が無いものを○、裂けが発生したものを×して表中に結果を記載した。
(2) High-speed peel test The heat seal layer of the laminate film is overlaid on the sheet, and knurled with 88 squares and 1.2 mm pitch is performed using a packaging machine, temperature 180 ° C., time 1.0 second, load A heat seal sample was obtained under the condition of 100 kg. A test piece having a width of 15 mm was cut from this heat seal sample, and it was 180 degrees with a universal tensile testing machine (manufactured by A & D Co., Ltd.) in a constant temperature room at 23 ° C. and 50% RH under the condition of a tensile speed of 300 mm / min. The maximum load is measured by peeling in the direction (unit: N / 15mm), and the film is peeled off vigorously by peeling off the container lid from the corner of the heat seal sample, and the film is peeled off at high speed. The results are shown in the table, with ○ indicating that no tearing occurred and × indicating that tearing occurred.
（３）剛性
ＡＳＴＭ Ｄ８８２に従って、１％Ｓｅｃａｎｔ Ｍｏｄｕｌｕｓを２３℃、相対湿度５０％雰囲気で測定した。
(3) Rigidity According to ASTM D882, 1% Secant Modulus was measured in an atmosphere at 23 ° C. and 50% relative humidity.
実施例１
樹脂層（Ａ）を二層構成とした。最外層の樹脂層（Ａ１）用の樹脂として直鎖状低密度ポリエチレン〔密度０．９４ｇ／ｃｍ３、ＭＦＲ（１９０℃）４ｇ／１０ｍｉｎ；以下ＬＬＤＰＥという〕８５部と、マルチサイト触媒を用いて合成されたプロピレン単独重合体〔ＭＦＲ（２３０℃）８ｇ／１０ｍｉｎ、融点１６４℃；以下ＨＯＰＰ（１）という〕１５部との混合物を用い、これと積層する中間層の樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ８５部とＨＯＰＰ（１）１５部の混合物を用い、ヒートシール層（Ｂ）用の樹脂としてプロピレン−エチレンランダム共重合体〔ＭＦＲ（２３０℃）５ｇ／１０ｍｉｎ；以下ＣＯＰＰという〕５０部と、低密度ポリエチレン〔密度０．９２ｇ／ｃｍ３、ＭＦＲ（１９０℃）３５ｇ／１０ｍｉｎ；以下ＬＤＰＥという〕５０部との混合物を用い、樹脂層（Ａ１）用押出機（口径３０ｍｍ）と樹脂層（Ａ２）用押出機（口径４０ｍｍ）とヒートシール層（Ｂ）用押出機（口径３０ｍｍ）のそれぞれに樹脂を供給し、共押出法により押出温度２３０℃でＴダイから（Ａ１）／（Ａ２）／（Ｂ）の各層の厚さが１２μｍ／１５μｍ／３μｍになるように押出し、３０℃の水冷金属冷却ロールで冷却し、樹脂層（Ａ１）の濡れ張力が４０ｍＮ／ｍとなるようにコロナ放電処理を施した後、ロールに巻き取り、３５℃の熟成室で４８時間熟成させて、全厚が３０μｍの共押出積層フィルムを得た。
Example 1
The resin layer (A) has a two-layer structure. As a resin for the outermost resin layer (A1), 85 parts of linear low density polyethylene (density 0.94 g / cm 3 , MFR (190 ° C.) 4 g / 10 min; hereinafter referred to as LLDPE) and a multisite catalyst are used. A mixture of 15 parts of a synthesized propylene homopolymer [MFR (230 ° C.) 8 g / 10 min, melting point 164 ° C .; hereinafter referred to as HOPP (1)] for the resin layer (A2) of the intermediate layer laminated thereon Using a mixture of 85 parts of LLDPE and 15 parts of HOPP (1) as the resin, 50 parts of propylene-ethylene random copolymer [MFR (230 ° C.) 5 g / 10 min; hereinafter referred to as COPP] as the resin for the heat seal layer (B); , 50 parts of low density polyethylene [density 0.92 g / cm 3 , MFR (190 ° C.) 35 g / 10 min; hereinafter referred to as LDPE] Resin is supplied to each of the resin layer (A1) extruder (caliber 30 mm), the resin layer (A2) extruder (caliber 40 mm), and the heat seal layer (B) extruder (caliber 30 mm) using the mixture. , Extruded from a T die at a extrusion temperature of 230 ° C. by a co-extrusion method so that the thickness of each layer of (A1) / (A2) / (B) is 12 μm / 15 μm / 3 μm, and cooled with a 30 ° C. water-cooled metal cooling roll Then, after performing corona discharge treatment so that the wetting tension of the resin layer (A1) is 40 mN / m, it is wound on a roll and aged in a aging room at 35 ° C. for 48 hours, so that the total thickness is 30 μm. A laminated film was obtained.
実施例２
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ７０部とＨＯＰＰ（１）３０部の混合物を用いた以外は実施例１と同様にして実施例２の共押出積層フィルムを得た。
Example 2
A coextruded laminated film of Example 2 was obtained in the same manner as in Example 1 except that a mixture of 70 parts of LLDPE and 30 parts of HOPP (1) was used as the resin for the resin layer (A1) and the resin layer (A2).
実施例３
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ６０部とＨＯＰＰ（１）４０部の混合物を用いた以外は実施例１と同様にして実施例３の共押出積層フィルムを得た。
Example 3
A coextruded laminated film of Example 3 was obtained in the same manner as in Example 1 except that a mixture of 60 parts of LLDPE and 40 parts of HOPP (1) was used as the resin for the resin layer (A1) and the resin layer (A2).
実施例４
ヒートシール層（Ｂ）用の樹脂としてＣＯＰＰ３５部とＬＤＰＥ６５部との混合物を用いた以外は実施例１と同様にして実施例４の共押出積層フィルムを得た。
Example 4
A coextruded laminated film of Example 4 was obtained in the same manner as in Example 1 except that a mixture of 35 parts of COPP and 65 parts of LDPE was used as the resin for the heat seal layer (B).
実施例５
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ７０部とＨＯＰＰ（１）３０部の混合物を用い、ヒートシール層（Ｂ）用の樹脂としてＣＯＰＰ３５部とＬＤＰＥ６５部との混合物を用いた以外は実施例１と同様にして実施例５の共押出積層フィルムを得た。
Example 5
A mixture of LLDPE 70 parts and HOPP (1) 30 parts was used as the resin for the resin layer (A1) and resin layer (A2), and a mixture of COPP 35 parts and LDPE 65 parts was used as the resin for the heat seal layer (B). A coextruded laminated film of Example 5 was obtained in the same manner as Example 1 except for the above.
実施例６
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ６０部とＨＯＰＰ（１）４０部の混合物を用い、ヒートシール層（Ｂ）用の樹脂としてＣＯＰＰ３５部とＬＤＰＥ６５部との混合物を用いた以外は実施例１と同様にして実施例６の共押出積層フィルムを得た。
Example 6
As a resin for the resin layer (A1) and the resin layer (A2), a mixture of 60 parts of LLDPE and 40 parts of HOPP (1) was used, and as a resin for the heat seal layer (B), a mixture of 35 parts of COPP and 65 parts of LDPE was used. A coextruded laminated film of Example 6 was obtained in the same manner as Example 1 except for the above.
実施例７
（Ａ１）／（Ａ２）／（Ｂ）の各層の厚さが１０．５μｍ／１５μｍ／４．５μｍになるように押出した以外は実施例１と同様にして実施例７の共押出積層フィルムを得た。
Example 7
The coextruded laminated film of Example 7 was prepared in the same manner as in Example 1 except that the layers (A1) / (A2) / (B) were extruded to have a thickness of 10.5 μm / 15 μm / 4.5 μm. Obtained.
実施例８
（Ａ１）／（Ａ２）／（Ｂ）の各層の厚さが１６μｍ／２０μｍ／４μｍになるように押出した以外は実施例１と同様にして実施例８の共押出積層フィルムを得た。
Example 8
A coextruded laminated film of Example 8 was obtained in the same manner as in Example 1 except that the thickness of each layer (A1) / (A2) / (B) was 16 μm / 20 μm / 4 μm.
実施例９
（Ａ１）／（Ａ２）／（Ｂ）の各層の厚さが１４μｍ／２０μｍ／６μｍになるように押出した以外は実施例１と同様にして実施例９の共押出積層フィルムを得た。
Example 9
A coextruded laminated film of Example 9 was obtained in the same manner as in Example 1 except that the thickness of each layer (A1) / (A2) / (B) was 14 μm / 20 μm / 6 μm.
実施例１０
ヒートシール層（Ｂ）用の樹脂としてプロピレン−エチレン−ブテン−１ランダム共重合体〔ＭＦＲ（２３０℃）６ｇ／１０ｍｉｎ；以下ＰＥＢという〕５０部とＬＤＰＥ５０部との混合物を用いた以外は実施例１と同様にして実施例１０の共押出積層フィルムを得た。
Example 10
Except for using a mixture of 50 parts of propylene-ethylene-butene-1 random copolymer [MFR (230 ° C.) 6 g / 10 min; hereinafter referred to as PEB] and 50 parts of LDPE as the resin for the heat seal layer (B). The coextruded laminated film of Example 10 was obtained in the same manner as in Example 1.
実施例１１
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ６０部とＨＯＰＰ（１）４０部の混合物を用い、ヒートシール層（Ｂ）用の樹脂としてＰＥＢ５０部とＬＤＰＥ５０部との混合物を用いた以外は実施例１と同様にして実施例１１の共押出積層フィルムを得た。
Example 11
As a resin for the resin layer (A1) and the resin layer (A2), a mixture of 60 parts of LLDPE and 40 parts of HOPP (1) was used, and as a resin for the heat seal layer (B), a mixture of 50 parts of PEB and 50 parts of LDPE was used. A coextruded laminated film of Example 11 was obtained in the same manner as Example 1 except for the above.
比較例１
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥを用い、ヒートシール層（Ｂ）用の樹脂としてＣＯＰＰ６０部とＬＤＰＥ４０部との混合物を用いた以外は実施例１と同様にして比較例１の共押出積層フィルムを得た。
Comparative Example 1
Comparison was made in the same manner as in Example 1 except that LLDPE was used as the resin for the resin layer (A1) and the resin layer (A2), and a mixture of COPP 60 parts and LDPE 40 parts was used as the resin for the heat seal layer (B). The coextruded laminated film of Example 1 was obtained.
比較例２
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥを用い、ヒートシール層（Ｂ）用の樹脂としてＣＯＰＰ５０部とＬＤＰＥ５０部との混合物を用いた以外は実施例１と同様にして比較例２の共押出積層フィルムを得た。
Comparative Example 2
Comparison was made in the same manner as in Example 1 except that LLDPE was used as the resin for the resin layer (A1) and the resin layer (A2), and a mixture of 50 parts of COPP and 50 parts of LDPE was used as the resin for the heat seal layer (B). The coextruded laminated film of Example 2 was obtained.
比較例３
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥを用い、ヒートシール層（Ｂ）用の樹脂としてＣＯＰＰ４０部とＬＤＰＥ６０部との混合物を用いた以外は実施例１と同様にして比較例３の共押出積層フィルムを得た。
Comparative Example 3
Comparison was made in the same manner as in Example 1 except that LLDPE was used as the resin for the resin layer (A1) and the resin layer (A2), and a mixture of COPP 40 parts and LDPE 60 parts was used as the resin for the heat seal layer (B). The coextruded laminated film of Example 3 was obtained.
比較例４
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ９０部とＨＯＰＰ（１）１０部の混合物を用いた以外は実施例１と同様にして比較例４の共押出積層フィルムを得た。
Comparative Example 4
A coextruded laminated film of Comparative Example 4 was obtained in the same manner as in Example 1 except that a mixture of 90 parts of LLDPE and 10 parts of HOPP (1) was used as the resin for the resin layer (A1) and the resin layer (A2).
比較例５
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ８０部とマルチサイト触媒を用いて合成されたプロピレン単独重合体〔ＭＦＲ（２３０℃）２ｇ／１０ｍｉｎ、融点１６４℃；以下ＨＯＰＰ（２）という〕２０部の混合物を用いた以外は実施例１と同様にして比較例５の共押出積層フィルムを得た。
Comparative Example 5
Propylene homopolymer synthesized using 80 parts of LLDPE as a resin for the resin layer (A1) and the resin layer (A2) and a multisite catalyst [MFR (230 ° C.) 2 g / 10 min, melting point 164 ° C .; hereinafter HOPP (2) A coextruded laminated film of Comparative Example 5 was obtained in the same manner as in Example 1 except that 20 parts of the mixture was used.
比較例６
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ７０部とＨＯＰＰ（２）３０部の混合物を用いた以外は実施例１と同様にして比較例６の共押出積層フィルムを得た。
Comparative Example 6
A coextruded laminated film of Comparative Example 6 was obtained in the same manner as in Example 1 except that a mixture of 70 parts of LLDPE and 30 parts of HOPP (2) was used as the resin for the resin layer (A1) and the resin layer (A2).
比較例７
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ５０部とＨＯＰＰ（１）５０部の混合物を用いた以外は実施例１と同様にして比較例７の共押出積層フィルムを得た。
Comparative Example 7
A coextruded laminated film of Comparative Example 7 was obtained in the same manner as in Example 1 except that a mixture of 50 parts of LLDPE and 50 parts of HOPP (1) was used as the resin for the resin layer (A1) and the resin layer (A2).
比較例８
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＨＯＰＰ（１）を用いた以外は実施例１と同様にして比較例８の共押出積層フィルムを得た。
Comparative Example 8
A coextruded laminated film of Comparative Example 8 was obtained in the same manner as in Example 1 except that HOPP (1) was used as the resin for the resin layer (A1) and the resin layer (A2).
比較例９
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＣＯＰＰを用いた以外は実施例１と同様にして比較例９の共押出積層フィルムを得た。
Comparative Example 9
A coextruded laminated film of Comparative Example 9 was obtained in the same manner as in Example 1 except that COPP was used as the resin for the resin layer (A1) and the resin layer (A2).
比較例１０
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂として高密度ポリエチレン〔密度０．９６０ｇ／ｃｍ３、ＭＦＲ（１９０℃）７ｇ／１０ｍｉｎ；以下ＨＤＰＥという〕を用いた以外は実施例１と同様にして比較例１０の共押出積層フィルムを得た。
Comparative Example 10
Example 1 except that high density polyethylene [density 0.960 g / cm 3 , MFR (190 ° C.) 7 g / 10 min; hereinafter referred to as HDPE] is used as the resin for the resin layer (A1) and the resin layer (A2). Thus, a coextruded laminated film of Comparative Example 10 was obtained.
比較例１１
ヒートシール層（Ｂ）用の樹脂としてＣＯＰＰ６０部とＬＤＰＥ４０部との混合物を用いた以外は実施例１と同様にして比較例１１の共押出積層フィルムを得た。
Comparative Example 11
A coextruded laminated film of Comparative Example 11 was obtained in the same manner as in Example 1 except that a mixture of 60 parts of COPP and 40 parts of LDPE was used as the resin for the heat seal layer (B).
比較例１２
ヒートシール層（Ｂ）用の樹脂としてＣＯＰＰ３０部とＬＤＰＥ７０部との混合物を用いた以外は実施例１と同様にして比較例１２の共押出積層フィルムを得た。
Comparative Example 12
A coextruded laminated film of Comparative Example 12 was obtained in the same manner as in Example 1 except that a mixture of 30 parts of COPP and 70 parts of LDPE was used as the resin for the heat seal layer (B).
比較例１３
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ６０部とＨＯＰＰ（１）４０部の混合物を用い、ヒートシール層（Ｂ）用の樹脂としてＣＯＰＰ６０部とＬＤＰＥ４０部との混合物を用いた以外は実施例１と同様にして比較例１３の共押出積層フィルムを得た。
Comparative Example 13
As a resin for the resin layer (A1) and the resin layer (A2), a mixture of 60 parts of LLDPE and 40 parts of HOPP (1) was used, and as a resin for the heat seal layer (B), a mixture of 60 parts of COPP and 40 parts of LDPE was used. A coextruded laminated film of Comparative Example 13 was obtained in the same manner as Example 1 except for the above.
比較例１４
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ６０部とＨＯＰＰ（１）４０部の混合物を用い、ヒートシール層（Ｂ）用の樹脂としてＣＯＰＰ３０部とＬＤＰＥ７０部との混合物を用いた以外は実施例１と同様にして比較例１４の共押出積層フィルムを得た。
Comparative Example 14
As a resin for the resin layer (A1) and the resin layer (A2), a mixture of 60 parts of LLDPE and 40 parts of HOPP (1) was used, and as a resin for the heat seal layer (B), a mixture of 30 parts of COPP and 70 parts of LDPE was used. A coextruded laminated film of Comparative Example 14 was obtained in the same manner as Example 1 except for the above.
比較例１５
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ８５部とＣＯＰＰ１５部の混合物を用いた以外は実施例１と同様にして比較例１５の共押出積層フィルムを得た。
Comparative Example 15
A coextruded laminated film of Comparative Example 15 was obtained in the same manner as in Example 1 except that a mixture of 85 parts of LLDPE and 15 parts of COPP was used as the resin for the resin layer (A1) and the resin layer (A2).
比較例１６
樹脂層（Ａ１）、樹脂層（Ａ２）用の樹脂としてＬＬＤＰＥ６０部とＣＯＰＰ４０部の混合物を用いた以外は実施例１と同様にして比較例１６の共押出積層フィルムを得た。
Comparative Example 16
A coextruded laminated film of Comparative Example 16 was obtained in the same manner as in Example 1 except that a mixture of LLDPE 60 parts and COPP 40 parts was used as the resin for the resin layer (A1) and the resin layer (A2).
Claims (6)
１９０℃でのメルトフローレートが１０〜５０ｇ／１０ｍｉｎであり、密度が０．９１５〜０．９３５ｇ／ｃｍ３である低密度ポリエチレン（ｂ１）５０〜６５質量％と、２３０℃でのメルトフローレートが２〜１５ｇ／１０ｍｉｎのプロピレン系樹脂（ｂ２）を３５〜５０質量％とを混合してなる樹脂混合物を主成分とするヒートシール層（Ｂ）と、
が隣接して積層されてなる共押出多層フィルムであって、
フィルムの全厚が２０〜５０μｍであり、且つ前記ヒートシール層（Ｂ）の厚さがフィルム全厚の５〜１５％の範囲であることを特徴とする易開封性共押出多層フィルム。 60 to 85% by mass of linear low density polyethylene (a1) having a melt flow rate at 190 ° C. of 2.0 to 12 g / 10 min and a density of 0.930 to 0.950 g / cm 3 , 230 A resin layer (A) mainly composed of a resin mixture obtained by mixing polypropylene (a2) having a melt flow rate of 5.0 to 12 g / 10 min at 15 ° C. with 15 to 40% by mass;
50-65% by mass of low density polyethylene (b1) having a melt flow rate at 190 ° C. of 10-50 g / 10 min and a density of 0.915-0.935 g / cm 3 , and a melt flow rate at 230 ° C. Heat seal layer (B) mainly composed of a resin mixture formed by mixing 35 to 50% by mass of propylene-based resin (b2) of 2 to 15 g / 10 min;
Are coextruded multilayer films laminated adjacently,
An easy-open coextruded multilayer film characterized in that the total thickness of the film is 20 to 50 µm, and the thickness of the heat seal layer (B) is in the range of 5 to 15% of the total thickness of the film.
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| JP3867474B2 (en) * | 2000-04-28 | 2007-01-10 | 大日本インキ化学工業株式会社 | Easy-open composite film and packaging container |
| JP4731699B2 (en) * | 2001-02-16 | 2011-07-27 | 三井化学東セロ株式会社 | Thermal fusion film and package comprising the same |
| JP2003136586A (en) * | 2001-11-02 | 2003-05-14 | Shigemichi Hiraoka | In-mold label for blow-molded vessel made of polyethylene resin, blow-molded vessel made of polyethylene resin, and manufacturing method therefor |
| JP4938213B2 (en) * | 2003-11-26 | 2012-05-23 | Ｄｉｃ株式会社 | Coextruded multilayer film and laminate film |
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2011
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