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JP2007038605A - Co-extrusion laminated film and laminate film and packaging container using the same - Google Patents

Co-extrusion laminated film and laminate film and packaging container using the same Download PDF

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JP2007038605A
JP2007038605A JP2005227835A JP2005227835A JP2007038605A JP 2007038605 A JP2007038605 A JP 2007038605A JP 2005227835 A JP2005227835 A JP 2005227835A JP 2005227835 A JP2005227835 A JP 2005227835A JP 2007038605 A JP2007038605 A JP 2007038605A
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resin layer
propylene
density polyethylene
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copolymer
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JP2007038605A5 (en
JP4692818B2 (en
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Tatsuhiko Usui
達彦 薄井
Junichi Mikami
順一 三上
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DIC Corp
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Dainippon Ink and Chemicals Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a co-extruded lamination film which is easy to unseal as a sealant film, has a retorting resistance, and keeps a sufficiently great seal strength during a heat treatment such as retorting. <P>SOLUTION: In the co-extruded lamination film, (A) a first resin layer containing 70-100 mass% propylene-butene-1 copolymer, and (B) a second resin layer containing 50-100 mass% of (b) a straight chain low density polyethylene with a density of 0.930-0.950 g/cm<SP>3</SP>, are laminated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、シーラントフィルムとして易開封性に優れ、レトルト殺菌処理等の加熱処理中にも十分なシール強度を保持できる耐レトルト性を有する共押出積層フィルム並びにそれを用いたラミネートフィルム及び包装容器に関する。   The present invention relates to a coextrusion laminated film having retort resistance capable of maintaining sufficient sealing strength during heat treatment such as retort sterilization treatment, and a laminate film and a packaging container using the same. .

近年、ボイルやレトルト等の加熱殺菌処理を施す食品用容器包装体は、食品の衛生性向上や賞味期限の長期化から、より高温下で加熱殺菌処理が実施される傾向であり、加熱殺菌中に内容物が漏れないように、より高い密封性が要求されている。また、流通時の衝撃等に耐えるように非常に強固な密封性を有したものが広く使用されてきた。しかし、このような高い密封性の容器包装体を使用した場合、開封時に大きな力を要するため、開封時に内容物がこぼれたり、吹き出したりすることがあり、非常に扱いにくいものであった。特に、バリアフリー等の観点から年配者や子供でも容易に開封できる易開封性を有する容器包装体が求められているが、このような高い密封性の容器包装体は十分な易開封性を有するものではなかった。   In recent years, food containers and packages subjected to heat sterilization treatment such as boiling and retort have been apt to be subjected to heat sterilization treatment at higher temperatures due to improved food hygiene and shelf life. In order to prevent the contents from leaking, higher sealing performance is required. In addition, those having a very strong sealing property so as to withstand impacts during distribution have been widely used. However, when such a highly sealed container / package is used, a large force is required at the time of opening, and the contents may spill or blow out at the time of opening, which is very difficult to handle. In particular, from the viewpoint of barrier-free and the like, there is a need for an easy-open container package that can be easily opened by elderly people and children, but such a highly-sealed container package has sufficient openability. It was not a thing.

そこで、この開封時の扱いにくさを解決し、易開封性を付与する方法として、初期のシール強度を低くする方法がある。しかしながら、一般にヒートシールにより密封したシール部分は、加熱中すなわち高温時にシール強度が低下するため、初期のシール強度を低くすると高温時のシール強度を十分に維持するのは難しく、易開封性と加熱中の高いシール強度を両立するのは困難であった。   Therefore, as a method for solving the difficulty in handling at the time of opening and imparting easy opening, there is a method of lowering the initial sealing strength. However, in general, a seal portion sealed by heat sealing has a reduced seal strength during heating, that is, at a high temperature. Therefore, if the initial seal strength is lowered, it is difficult to maintain a sufficient seal strength at a high temperature. It was difficult to achieve both high sealing strength.

易開封性を有するシーラントフィルムとしては、エチレン−酢酸ビニル系共重合体からなる樹脂層と、低密度ポリエチレンからなる樹脂層との2層からなる積層フィルム(例えば、特許文献1参照。)、プロピレン−エチレン−ブテン三元共重合体、低密度ポリエチレン及び直鎖状ポリエチレンからなる樹脂層と、プロピレン−エチレンランダム共重合体及び直鎖状ポリエチレンからなる樹脂層との2層からなる積層フィルム(例えば、特許文献2参照。)、ポリプロピレン系共重合体、低密度ポリエチレン及びエチレン−プロピレンゴム又はエチレン−プロピレン−ブテン−1ゴムからなる樹脂層と、プロピレン系重合体からなる樹脂層との2層からなる積層フィルム(例えば、特許文献3参照。)、直鎖状低密度ポリエチレンと、エチレン−プロピレン共重合体、エチレン−ブテン共重合体、プロピレン−ブテン共重合体、プロピレン−エチレン−ブテン三元共重合体からなる群から選ばれる樹脂とからなる樹脂層と、高密度ポリエチレンからなる樹脂層との2層からなる積層フィルム(例えば、特許文献4参照。)等が提案されている。   As an easily openable sealant film, a laminated film consisting of two layers of a resin layer made of an ethylene-vinyl acetate copolymer and a resin layer made of low-density polyethylene (for example, see Patent Document 1), propylene. -A laminated film comprising two layers of an ethylene-butene terpolymer, a resin layer made of low-density polyethylene and linear polyethylene, and a resin layer made of propylene-ethylene random copolymer and linear polyethylene (for example, 2), a polypropylene copolymer, a low-density polyethylene and a resin layer made of ethylene-propylene rubber or ethylene-propylene-butene-1 rubber, and a resin layer made of a propylene polymer. Laminated film (see, for example, Patent Document 3), linear low density polyethylene, and ethylene A resin layer comprising a resin selected from the group consisting of a propylene copolymer, an ethylene-butene copolymer, a propylene-butene copolymer, and a propylene-ethylene-butene terpolymer, and a resin comprising a high-density polyethylene A laminated film composed of two layers (for example, see Patent Document 4) has been proposed.

しかしながら、これらの積層フィルムをシーラントフィルムとして用いた場合、易開封性は向上するが、レトルト殺菌処理等の加熱処理中のシール強度を保持できない問題があった。特に、加熱処理前の易開封性を高めると、レトルト殺菌処理中に内容物が漏れる問題があった。
特開昭58−132552号公報 特開2001−219518号公報 特開2001−277448号公報 特開2003−72001号公報
However, when these laminated films are used as a sealant film, easy-openability is improved, but there is a problem that the sealing strength during heat treatment such as retort sterilization treatment cannot be maintained. In particular, when the easy-opening property before the heat treatment is enhanced, there is a problem that the contents leak during the retort sterilization treatment.
JP 58-132552 A JP 2001-219518 A JP 2001-277448 A Japanese Patent Laid-Open No. 2003-72001

本発明の課題は、シーラントフィルムとして易開封性に優れ、レトルト殺菌処理等の加熱処理中にも十分なシール強度を保持できる耐レトルト性を有する共押出積層フィルム並びにそれを用いたラミネートフィルム及び包装容器を提供することである。   An object of the present invention is to provide a coextrusion laminated film having retort resistance capable of maintaining sufficient sealing strength even during heat treatment such as retort sterilization as well as a laminate film and a packaging using the same. Is to provide a container.

本発明者らは、上記の課題を解決すべく鋭意研究した結果、プロピレン−ブテン−1共重合体を主成分として含有する樹脂層と、0.930〜0.950g/cmの密度を有する直鎖状低密度ポリエチレンを主成分として含有する第2樹脂層(B)とを隣接して積層した共押出積層フィルムをシーラントフィルムとして用いると、易開封性に優れ、加熱中にも十分なシール強度を保持できることを見いだし、本発明を完成するに至った。 As a result of intensive studies to solve the above problems, the present inventors have a resin layer containing a propylene-butene-1 copolymer as a main component and a density of 0.930 to 0.950 g / cm 3. When a coextruded laminated film in which a second resin layer (B) containing a linear low-density polyethylene as a main component is laminated adjacently is used as a sealant film, it is excellent in easy-opening properties and is sufficiently sealed even during heating. It has been found that the strength can be maintained, and the present invention has been completed.

すなわち、本発明は、プロピレン−ブテン−1共重合体を70〜100質量%含有する第1樹脂層(A)と、密度が0.930〜0.950g/cmである直鎖状低密度ポリエチレン(b)を50〜100質量%含有する第2樹脂層(B)とが積層されていることを特徴とする共押出積層フィルム並びにそれを用いたラミネートフィルム及び包装容器を提供するものである。 That is, the present invention includes a first resin layer (A) containing 70 to 100% by mass of a propylene-butene-1 copolymer, and a linear low density having a density of 0.930 to 0.950 g / cm 3. Provided is a coextruded laminated film characterized by being laminated with a second resin layer (B) containing 50 to 100% by mass of polyethylene (b), and a laminate film and a packaging container using the same. .

本発明の共押出積層フィルムは、子供や年配者でも容易に開封可能な優れた易開封性と、レトルト殺菌処理等の加熱処理中に内容物を漏らさないシール強度を兼ね備える。したがって、本発明の共押出積層フィルムは、シーラントフィルムとして有用であり、各種の包装用ラミネートフィルムに好適に用いることができる。特に、本発明の共押出積層フィルムをシーラントフィルムとして用いたラミネートフィルムは、食品、医薬品等の開口部を有する包装容器の開口部を封止する蓋材として最適である。   The co-extruded laminated film of the present invention has excellent easy-openability that can be easily opened by children and the elderly, and seal strength that does not leak contents during heat treatment such as retort sterilization treatment. Therefore, the coextruded laminated film of the present invention is useful as a sealant film and can be suitably used for various packaging laminate films. In particular, a laminate film using the coextruded laminated film of the present invention as a sealant film is optimal as a lid material for sealing the opening of a packaging container having an opening for food, medicine, and the like.

以下、本発明を詳細に説明する。   Hereinafter, the present invention will be described in detail.

本発明の共押出積層フィルムの第1樹脂層(A)で用いるプロピレン−ブテン1共重合体としては、特に限定されないが、メルトフローレート(JIS K7210に準拠して、230℃、21.18Nで測定した値;以下、「MFR」という。)が0.5〜30.0g/10分、融点が120〜155℃のものが好ましく、より好ましくは、MFRが1.5〜10.0g/10分、融点が130〜150℃である。MFR及び融点がこの範囲であれば、積層フィルムの成膜性が向上する。また、第1樹脂層(A)中のプロピレン−ブテン1共重合体の含有量としては、70〜100質量%が好ましく、より好ましくは80〜100質量%である。含有量がこの範囲であれば、加熱処理中のシール強度が向上する。   Although it does not specifically limit as a propylene-butene 1 copolymer used with the 1st resin layer (A) of the coextruded laminated film of this invention, It is 230 degreeC and 21.18N according to JISK7210. Measured value; hereinafter referred to as “MFR”) is preferably 0.5 to 30.0 g / 10 min and a melting point of 120 to 155 ° C., more preferably, MFR is 1.5 to 10.0 g / 10. The melting point is 130-150 ° C. If MFR and melting | fusing point are this range, the film-forming property of a laminated film will improve. Moreover, as content of the propylene-butene 1 copolymer in a 1st resin layer (A), 70-100 mass% is preferable, More preferably, it is 80-100 mass%. When the content is within this range, the sealing strength during the heat treatment is improved.

また、第1樹脂層(A)に、直鎖状低密度ポリエチレン(a)を配合すると、第1樹脂層(A)中の凝集力が低下し、剥離する際、内部破壊により剥がれ出しが滑らかになる点で好ましい。この第1樹脂層(A)で用いる直鎖状低密度ポリエチレン(a)としては、例えば、エチレンと、ブテン−1、ヘキセン−1、4−メチル−ペンテン−1、オクテン−1等のα−オレフィンとの共重合体が挙げられる。また、直鎖状低密度ポリエチレン(a)の製造で用いる触媒は、マルチサイト触媒でもシングルサイト触媒でもかまわないが、フィルム強度等の物性の点からシングルサイト触媒を用いた方がより好ましい。   Moreover, when a linear low density polyethylene (a) is mix | blended with a 1st resin layer (A), the cohesion force in a 1st resin layer (A) will fall, and when peeling, peeling will be smooth by internal destruction This is preferable. Examples of the linear low density polyethylene (a) used in the first resin layer (A) include ethylene and α- such as butene-1, hexene-1, 4-methyl-pentene-1, and octene-1. Examples include copolymers with olefins. The catalyst used in the production of the linear low density polyethylene (a) may be a multisite catalyst or a single site catalyst, but it is more preferable to use a single site catalyst from the viewpoint of physical properties such as film strength.

前記直鎖状低密度ポリエチレン(a)は、密度が0.880〜0.930g/cmのものが好ましい。密度が0.880g/cm未満では、加熱処理中のシール強度が低下する傾向があり、0.930g/cmを超えると、プロピレン−ブテン1共重合体との相溶性に劣り透明性を低下させる。また、直鎖状低密度ポリエチレン(a)のMFR(190℃、21.18N)は、0.5〜30.0g/10分のものが好ましい。MFRがこの範囲であれば、積層フィルムの成膜性が向上する。第1樹脂層(A)中に直鎖状低密度ポリエチレン(a)を配合する場合、その含有量としては、5〜30質量%が好ましく、より好ましくは10〜20質量%である。含有量が30質量%を超えると、加熱処理中のシール強度が低下する傾向がある。 The linear low density polyethylene (a) preferably has a density of 0.880 to 0.930 g / cm 3 . When the density is less than 0.880 g / cm 3 , the sealing strength tends to be lowered during the heat treatment, and when it exceeds 0.930 g / cm 3 , the compatibility with the propylene-butene 1 copolymer is poor and the transparency is low. Reduce. The MFR (190 ° C., 21.18N) of the linear low density polyethylene (a) is preferably 0.5 to 30.0 g / 10 min. When the MFR is within this range, the film formability of the laminated film is improved. When mix | blending a linear low density polyethylene (a) in a 1st resin layer (A), as its content, 5-30 mass% is preferable, More preferably, it is 10-20 mass%. When content exceeds 30 mass%, there exists a tendency for the sealing strength in heat processing to fall.

一方、本発明の共押出積層フィルムの第2樹脂層(B)で用いる直鎖状低密度ポリエチレン(b)としては、例えば、エチレンと、ブテン−1、ヘキセン−1、4−メチル−ペンテン−1、オクテン−1等のα−オレフィンとの共重合体が挙げられる。また、直鎖状低密度ポリエチレン(b)の製造で用いる触媒は、マルチサイト触媒でもシングルサイト触媒でもかまわないが、フィルム強度等の物性の点からシングルサイト触媒を用いた方がより好ましい。   On the other hand, as the linear low density polyethylene (b) used in the second resin layer (B) of the coextruded laminated film of the present invention, for example, ethylene, butene-1, hexene-1, 4-methyl-pentene- 1, and a copolymer with an α-olefin such as octene-1. The catalyst used in the production of the linear low density polyethylene (b) may be a multisite catalyst or a single site catalyst, but it is more preferable to use a single site catalyst from the viewpoint of physical properties such as film strength.

前記直鎖状低密度ポリエチレン(b)は、密度が0.930〜0.950g/cmのものが好ましい。密度が0.930g/cm未満では、加熱中のシール強度が低下する傾向があり、0.950g/cmを超えると、得られる積層フィルムが剛直なものとなり、開封時にフィルムが裂けたり、破断したりする問題が生じる。またカール等を発生してラミネート加工性に問題を生じる場合もある。同等以上の密度をもつポリエチレンとしては、中密度ポリエチレン、高密度ポリエチレン等もあるが、結晶化速度の速さや溶融時の弾性保持等の点で、直鎖状低密度ポリエチレンであることが好ましい。また、直鎖状低密度ポリエチレン(b)のMFR(190℃、21.18N)は、0.5〜30.0g/10分のものが好ましい。MFRがこの範囲であれば、積層フィルムの成膜性が向上する。さらに、第2樹脂層(B)中の直鎖状低密度ポリエチレン(b)の含有量としては、50〜100質量%が好ましく、より好ましくは60〜100質量%である。含有量がこの範囲であれば、加熱処理中のシール強度が向上する。 The linear low density polyethylene (b) preferably has a density of 0.930 to 0.950 g / cm 3 . If the density is less than 0.930 g / cm 3 , the sealing strength during heating tends to decrease, and if it exceeds 0.950 g / cm 3 , the resulting laminated film becomes rigid and the film tears when opened, The problem of breaking occurs. In addition, curling or the like may occur, causing a problem in laminate processability. Examples of the polyethylene having the same or higher density include medium density polyethylene and high density polyethylene, but linear low density polyethylene is preferable from the viewpoint of high crystallization speed and elastic retention during melting. The MFR (190 ° C., 21.18N) of the linear low density polyethylene (b) is preferably 0.5 to 30.0 g / 10 min. When the MFR is within this range, the film formability of the laminated film is improved. Furthermore, as content of the linear low density polyethylene (b) in a 2nd resin layer (B), 50-100 mass% is preferable, More preferably, it is 60-100 mass%. When the content is within this range, the sealing strength during the heat treatment is improved.

また、第2樹脂層(B)に、プロピレン−ブテン−1共重合体を配合すると、プロピレン−ブテン−1共重合体を主成分とする第1樹脂層(A)との親和性が向上するので、第1樹脂層(A)と第2樹脂層(B)との界面における接着強度を制御でき、所望とする適度なシール強度に設定することができることからより好ましい。この第2樹脂層(B)に用いるプロピレン−ブテン−1共重合体は、第1樹脂層(A)で用いるものと同種のものを用いることができるが、積層フィルムの成膜性、及び第1樹脂層(A)との親和性の点で、MFR(230℃、21.18N)が0.5〜30.0g/10分、融点が120〜155℃のものが好ましく、より好ましくは、MFRが1.5〜10.0g/10分、融点が130〜150℃である。第2樹脂層(B)中にプロピレン−ブテン−1共重合体を配合する場合、その含有量としては、5〜25質量%が好ましく、より好ましくは10〜20質量%である。含有量がこの範囲であれば、加熱処理中のシール強度が向上し、易開封性が得られる。   Moreover, when a propylene-butene-1 copolymer is mix | blended with a 2nd resin layer (B), affinity with the 1st resin layer (A) which has a propylene-butene-1 copolymer as a main component will improve. Therefore, it is more preferable because the adhesive strength at the interface between the first resin layer (A) and the second resin layer (B) can be controlled and can be set to a desired appropriate seal strength. As the propylene-butene-1 copolymer used for the second resin layer (B), the same type as that used for the first resin layer (A) can be used. In terms of affinity with one resin layer (A), MFR (230 ° C., 21.18N) is preferably 0.5 to 30.0 g / 10 min, and melting point is 120 to 155 ° C., more preferably, The MFR is 1.5 to 10.0 g / 10 min and the melting point is 130 to 150 ° C. When mix | blending a propylene-butene-1 copolymer in a 2nd resin layer (B), as its content, 5-25 mass% is preferable, More preferably, it is 10-20 mass%. When the content is within this range, the sealing strength during the heat treatment is improved, and easy-openability is obtained.

さらに、第2樹脂層(B)に、プロピレン−ブテン−1共重合体の他に、低密度ポリエチレンを配合すると、第1樹脂層(A)と第2樹脂層(B)との界面の剥離強度のヒートシール条件(圧力及び温度)による変化を低減、すなわちシール強度のヒートシール圧力及び温度依存性を低下させることができるため、より好ましい。この第2樹脂層(B)に用いる低密度ポリエチレンとしては、密度が0.910g/cm〜0.960g/cmのものが好ましく、より好ましくは密度が0.915〜0.945g/cmのものである。密度が0.910g/cm未満では第1樹脂層(A)との親和性が高くなってシール強度が高くなり過ぎる傾向があり、0.960g/cmを超えると、透明性が低下する等の不具合が発生する場合がある。また、前記低密度ポリエチレンのMFR(190℃、21.18N)は、0.5〜30.0g/10分が好ましく、より好ましくは1.5〜10.0g/10分である。MFRがこの範囲であれば、積層フィルムの成膜性が向上する。第2樹脂層(B)中にプロピレン−ブテン−1共重合体及び低密度ポリエチレンを配合する場合、その含有量としては、プロピレン−ブテン−1共重合体5〜20質量%、低密度ポリエチレン5〜30質量%が好ましく、より好ましくはプロピレン−ブテン−1共重合体10〜20質量%、低密度ポリエチレン10〜30質量%である。含有量がこの範囲であれば、加熱処理中のシール強度、易開封性、および剥離安定性が向上する。 Furthermore, when low density polyethylene is blended in addition to the propylene-butene-1 copolymer, the interface between the first resin layer (A) and the second resin layer (B) is peeled off. It is more preferable because the change due to the strength heat seal condition (pressure and temperature) can be reduced, that is, the heat seal pressure and temperature dependency of the seal strength can be reduced. The low density polyethylene used for the second resin layer (B) preferably has a density of 0.910 g / cm 3 to 0.960 g / cm 3 , more preferably 0.915 to 0.945 g / cm. Three . When the density is less than 0.910 g / cm 3 , the affinity with the first resin layer (A) tends to be high and the sealing strength tends to be too high, and when it exceeds 0.960 g / cm 3 , the transparency is lowered. Such a problem may occur. The MFR (190 ° C., 21.18N) of the low density polyethylene is preferably 0.5 to 30.0 g / 10 minutes, and more preferably 1.5 to 10.0 g / 10 minutes. When the MFR is within this range, the film formability of the laminated film is improved. When the propylene-butene-1 copolymer and the low density polyethylene are blended in the second resin layer (B), the content thereof is 5 to 20% by mass of the propylene-butene-1 copolymer, the low density polyethylene 5 -30 mass% is preferable, More preferably, it is 10-20 mass% of propylene-butene-1 copolymers, and 10-30 mass% of low density polyethylene. When the content is within this range, the sealing strength, easy-opening property, and peeling stability during the heat treatment are improved.

本発明の共押出積層フィルムは、前記第1樹脂層(A)がヒートシール層として、前記第2樹脂層(B)が基材とラミネートを行うラミネート層として機能する2層構成のフィルムであるが、前記第2樹脂層(B)に隣接して第3樹脂層(C)を積層して、3層構成としても構わない。また、さらに前記第3樹脂層(C)に隣接して第4樹脂層(D)を積層して、4層構成としても構わない。この3層構成又は4層構成のフィルムとする場合、第3樹脂層(C)又は第4樹脂層(D)がラミネート層となるので、第3樹脂層(C)及び第4樹脂層(D)は、第2樹脂層(B)との密着性及び基材とのラミネート性が必要となるため、通常は上記の第2樹脂層(B)の樹脂組成の範囲のものとすることが好ましい。   The coextruded laminated film of the present invention is a film having a two-layer structure in which the first resin layer (A) functions as a heat seal layer and the second resin layer (B) functions as a laminate layer for laminating with a base material. However, the third resin layer (C) may be laminated adjacent to the second resin layer (B) to form a three-layer structure. Further, a fourth resin layer (D) may be laminated adjacent to the third resin layer (C) to form a four-layer structure. When it is set as the film of this 3 layer structure or a 4 layer structure, since a 3rd resin layer (C) or a 4th resin layer (D) becomes a laminate layer, a 3rd resin layer (C) and a 4th resin layer (D ) Requires adhesion to the second resin layer (B) and laminating properties with the substrate, and therefore it is usually preferable to have a resin composition within the range of the second resin layer (B). .

前記第1樹脂層(A)及び第2樹脂層(B)には、本発明の効果を損なわない範囲で、滑剤、ブロッキング防止剤、紫外線吸収剤、光安定剤、耐電防止剤、防曇剤等、着色剤等の添加剤を適宜添加してもよい。また、これらの添加剤としては、オレフィン系樹脂用として市販されているものを使用することが好ましい。   In the first resin layer (A) and the second resin layer (B), a lubricant, an antiblocking agent, an ultraviolet absorber, a light stabilizer, an antistatic agent, and an antifogging agent are used as long as the effects of the present invention are not impaired. An additive such as a colorant may be added as appropriate. Moreover, it is preferable to use what is marketed for olefin resin as these additives.

本発明の共押出積層フィルムの厚さとしては、20〜70μmが好ましく、より好ましくは30〜60μmである。また、第1樹脂層(A)の厚さとしては、1〜15μmが好ましく、より好ましくは2〜8μmである。第1樹脂層(A)の厚さが、この範囲であれば、易開封性が得られ、積層フィルム全体の厚さに依存せず一定のシール強度とすることができる。   As thickness of the co-extrusion laminated film of this invention, 20-70 micrometers is preferable, More preferably, it is 30-60 micrometers. Moreover, as thickness of a 1st resin layer (A), 1-15 micrometers is preferable, More preferably, it is 2-8 micrometers. If the thickness of the first resin layer (A) is within this range, easy-openability can be obtained, and a constant sealing strength can be obtained regardless of the thickness of the entire laminated film.

本発明の共押出積層フィルムの製造方法としては、共押出成形法であれば特に限定されるものではないが、例えば、2台以上の押出機を用いて各樹脂層に用いる樹脂を溶融し、共押出ダイス法、フィードブロック法等の共押出法により溶融状態で積層した後、インフレーション、T−ダイ・チルロール法等の方法を用いてフィルム状に加工する方法が挙げられる。   The method for producing the coextruded laminated film of the present invention is not particularly limited as long as it is a coextrusion molding method. For example, the resin used for each resin layer is melted using two or more extruders, A method of laminating in a molten state by a coextrusion method such as a coextrusion die method or a feed block method, and then processing into a film using a method such as inflation or a T-die / chill roll method.

本発明の共押出積層フィルムは、第2樹脂層(B)側の表面にコロナ放電処理を施してもよい。また、本発明の効果を損なわない範囲で、滑剤、ブロッキング防止剤、紫外線吸収剤、光安定剤、耐電防止剤、防曇剤等、着色剤等を適宜添加してもよい。これらの添加剤としては、オレフィン系樹脂用の各種添加剤を使用することが好ましい。   The coextruded laminated film of the present invention may be subjected to corona discharge treatment on the surface on the second resin layer (B) side. In addition, a lubricant, an antiblocking agent, an ultraviolet absorber, a light stabilizer, an antistatic agent, an antifogging agent, and the like may be added as appropriate within a range not impairing the effects of the present invention. As these additives, it is preferable to use various additives for olefin-based resins.

本発明のラミネートフィルムは、本発明の共押出積層フィルムの第2樹脂層(B)の上に基材をラミネートしたものである。この基材としては、例えば、2軸延伸ポリエステルフィルム、2軸延伸ナイロンフィルム、不織布、アルミ箔、紙等が挙げられる。これらの基材は、単独でも、2種のフィルムを積層したものでも用いることができる。本発明の共押出積層フィルムに基材をラミネートする方法としては、例えば、ドライラミネート法、熱ラミネート法、多層押出コーティング法等が挙げられるが、これらのなかでも、ドライラミネート法がより好ましい。また、ドライラミネート法で、本発明の共押出積層フィルムと基材とをラミネートする際に用いる接着剤としては、例えば、ポリエーテル−ポリウレタン系接着剤、ポリエステル−ポリウレタン系接着剤等が挙げられる。   The laminate film of the present invention is obtained by laminating a substrate on the second resin layer (B) of the coextruded laminated film of the present invention. Examples of the substrate include a biaxially stretched polyester film, a biaxially stretched nylon film, a nonwoven fabric, an aluminum foil, and paper. These substrates can be used singly or as a laminate of two kinds of films. Examples of the method for laminating the substrate on the coextruded laminated film of the present invention include a dry laminating method, a thermal laminating method, a multilayer extrusion coating method, and the like. Among these, the dry laminating method is more preferable. Examples of the adhesive used when laminating the coextruded laminated film of the present invention and the substrate by a dry laminating method include polyether-polyurethane adhesives, polyester-polyurethane adhesives, and the like.

また、本発明の共押出積層フィルムと基材とをラミネートする前に、前記第2樹脂層(B)の表面にコロナ放電処理を施すと、基材との密着性が向上するため好ましい。   Moreover, it is preferable to perform a corona discharge treatment on the surface of the second resin layer (B) before laminating the coextruded laminated film of the present invention and the substrate, because the adhesion to the substrate is improved.

本発明のラミネートフィルムは、各種の包装用材料として好適に用いることができる。特に、食品、医薬品等の開口部を有する包装容器の開口部を封止する蓋材として最適である。また、本発明のラミネートフィルムを蓋材として用いる場合、包装容器の開口部のヒートシール面は、ポリプロピレン系樹脂を主成分としたものが好ましい。該ヒートシール面にポリプロピレン系樹脂を主成分としたものとすれば、包装容器の開口部と蓋材とのシール強度が適性となり、易開封性に優れ、加熱処理中に内容物が漏れないシール強度を保てる包装容器を得ることができる。   The laminate film of the present invention can be suitably used as various packaging materials. In particular, it is most suitable as a lid material for sealing the opening of a packaging container having an opening for food, medicine and the like. Moreover, when using the laminated film of this invention as a cover material, what has a polypropylene resin as a main component is preferable for the heat seal surface of the opening part of a packaging container. If the heat seal surface is mainly composed of a polypropylene resin, the seal strength between the opening of the packaging container and the lid becomes appropriate, the seal is excellent in easy opening, and the contents do not leak during the heat treatment. A packaging container that can maintain strength can be obtained.

前記ポリプロピレン系樹脂としては、例えば、ホモポリプロピレン、プロピレン−エチレン共重合体、プロピレン−ブテン−1共重合体、プロピレン−エチレン−ブテン−1共重合体等のプロピレンの単独重合体又はプロピレンとα−オレフィンとの共重合体が挙げられる。これらのポリプロピレン系樹脂のなかでも、重合体中のプロピレン単量体単位の含有量が70モル%以上のものであれば、十分なシール強度が得られるので好ましい。   Examples of the polypropylene resin include homopolymers of propylene such as homopolypropylene, propylene-ethylene copolymer, propylene-butene-1 copolymer, propylene-ethylene-butene-1 copolymer, and propylene and α- Examples include copolymers with olefins. Among these polypropylene resins, it is preferable that the propylene monomer unit content in the polymer is 70 mol% or more because sufficient sealing strength can be obtained.

また、前記包装容器の開口部のヒートシール面は、ポリプロピレン系樹脂を主成分として含有したものであるが、その含有量として、より好ましくは60質量%以上、さらに好ましくは80質量%以上である。前記ヒートシール面のポリプロピレン系樹脂の含有量がこの範囲であれば、十分なシール強度が得られるので好ましい。また、該ヒートシール面で、ポリプロピレン系樹脂と併用しても良い樹脂としては、ポリプロピレン系樹脂と相溶性が良く、ヒートシールを阻害しない樹脂であれば、特に限定はないが、例えば、エチレン単独重合体、エチレン−α−オレフィン共重合体等のポリエチレン系樹脂等が挙げられる。   The heat seal surface of the opening of the packaging container contains a polypropylene resin as a main component, and the content is more preferably 60% by mass or more, and still more preferably 80% by mass or more. . If the content of the polypropylene resin on the heat seal surface is within this range, it is preferable because sufficient seal strength can be obtained. In addition, the resin that may be used in combination with the polypropylene resin on the heat seal surface is not particularly limited as long as it is a resin that is compatible with the polypropylene resin and does not inhibit the heat seal. Examples thereof include polyethylene resins such as polymers and ethylene-α-olefin copolymers.

以下に実施例及び比較例を挙げて、本発明を具体的に説明する。なお、下記の「%」は質量基準である。   The present invention will be specifically described below with reference to examples and comparative examples. The “%” below is based on mass.

(実施例1〜4)
実施例1〜4に用いた樹脂は、下記の通りである。
(Examples 1-4)
Resins used in Examples 1 to 4 are as follows.

[第1樹脂層(A)に用いた樹脂]
プロピレン−ブテン−1共重合体:密度が0.890g/cm、MFR(230℃、21.18N)が4.0g/10分であるプロピレン−ブテン−1共重合体
LLDPE1:密度が0.900g/cm、MFR(190℃、21.18N)が3.5g/10分である直鎖状低密度ポリエチレン
[Resin used for first resin layer (A)]
Propylene-butene-1 copolymer: Propylene-butene-1 copolymer LLDPE having a density of 0.890 g / cm 3 and MFR (230 ° C., 21.18N) of 4.0 g / 10 min. Linear low density polyethylene having 900 g / cm 3 and MFR (190 ° C., 21.18 N) of 3.5 g / 10 min.

[第2樹脂層(B)に用いた樹脂]
LLDPE2:密度が0.935g/cm、MFR(190℃、21.18N)が4.5g/10分である直鎖状低密度ポリエチレン
LLDPE3:密度が0.943g/cm、MFR(190℃、21.18N)が4.0g/10分である直鎖状低密度ポリエチレン
プロピレン−ブテン−1共重合体:密度が0.890g/cm、MFR(230℃、21.18N)が4.0g/10分であるプロピレン−ブテン−1共重合体
LDPE1:密度が0.922g/cm、MFR(190℃、21.18N)が7.0g/10分である低密度ポリエチレン
[Resin used for second resin layer (B)]
LLDPE2: linear low density polyethylene LLDPE3 having a density of 0.935 g / cm 3 and MFR (190 ° C., 21.18 N) of 4.5 g / 10 min: density of 0.943 g / cm 3 , MFR (190 ° C. 21.18N) is a linear low density polyethylene propylene-butene-1 copolymer having a density of 4.0 g / 10 min: a density of 0.890 g / cm 3 , and an MFR (230 ° C., 21.18 N) of 4.18. Propylene-butene-1 copolymer LDPE 1: 0 g / 10 min Low density polyethylene having a density of 0.922 g / cm 3 and MFR (190 ° C., 21.18 N) of 7.0 g / 10 min

上記の樹脂を表1に示した各樹脂層の組成でそれぞれドライブレンドした。得られたブレンド物を、第1樹脂層(A)用押出機(口径40mm)と、第2樹脂層(B)用押出機(口径50mm)にそれぞれ供給し、共押出法により押出温度250℃でT−ダイから各層の厚さが表1に示した厚さになるように押出し、40℃の水冷金属冷却ロールで冷却した後、ロールに巻き取り、本発明の共押出積層フィルムを得た。得られたフィルムは、物理的性質を安定化されるため、35℃の熟成室で48時間熟成させた。   Each of the above resins was dry blended with the composition of each resin layer shown in Table 1. The obtained blend was supplied to an extruder for the first resin layer (A) (caliber 40 mm) and an extruder for the second resin layer (B) (caliber 50 mm), respectively, and an extrusion temperature of 250 ° C. by co-extrusion method. Then, each layer was extruded from the T-die so that the thickness of each layer was as shown in Table 1, cooled with a 40 ° C. water-cooled metal cooling roll, and then wound on a roll to obtain a coextruded laminated film of the present invention. . The obtained film was aged in a aging room at 35 ° C. for 48 hours in order to stabilize the physical properties.

(比較例1〜7)
比較例1〜7に用いた樹脂は、下記の通りである。
(Comparative Examples 1-7)
Resins used in Comparative Examples 1 to 7 are as follows.

[第1樹脂層(A)に用いた樹脂]
プロピレン−ブテン−1共重合体:密度が0.890g/cm、MFR(230℃、21.18N)が4.0g/10分であるプロピレン−ブテン−1共重合体
プロピレン−エチレン−ブテン−1共重合体:MFR(230℃、21.18N)が5.0g/10分、エチレン由来成分2.0質量%、ブテン由来成分5.0質量%、プロピレン由来成分93.0質量%であるプロピレン−エチレン−ブテン−1共重合体
LLDPE4:密度が0.912g/cm、MFR(190℃、21.18N)が15.0g/10分である直鎖状低密度ポリエチレン
LLDPE5:密度が0.925g/cm、MFR(190℃、21.18N)が4.5g/10分である直鎖状低密度ポリエチレン
COPP:密度が0.900g/cm、MFR(230℃、21.18N)7.0g/10分、エチレン由来成分が4%であるプロピレン−エチレン共重合体
LDPE1:密度が0.922g/cm、MFR(190℃、21.18N)が7.0g/10分である低密度ポリエチレン
LDPE3:密度が0.918g/cm、MFR(190℃、21.18N)が7.2g/10分である低密度ポリエチレン
EVA:密度が0.945g/cm、MFR(190℃、21.18N)7.0g/10分、酢酸ビニル含有量が15%であるエチレン−酢酸ビニル共重合体
[Resin used for first resin layer (A)]
Propylene-butene-1 copolymer: Propylene-butene-1 copolymer having a density of 0.890 g / cm 3 and MFR (230 ° C., 21.18N) of 4.0 g / 10 min. 1 copolymer: MFR (230 ° C., 21.18 N) is 5.0 g / 10 min, ethylene-derived component 2.0 mass%, butene-derived component 5.0 mass%, and propylene-derived component 93.0 mass%. Propylene-ethylene-butene-1 copolymer LLDPE4: linear low density polyethylene LLDPE5 having a density of 0.912 g / cm 3 and MFR (190 ° C., 21.18N) of 15.0 g / 10 min: density 0 .925g / cm 3, MFR (190 ℃, 21.18N) is 4.5 g / 10 min linear low density polyethylene COPP: density of 0.900 g / cm 3, FR (230 ℃, 21.18N) 7.0g / 10 min, propylene-ethylene-derived component is 4% - ethylene copolymer LDPE 1: density 0.922g / cm 3, MFR (190 ℃, 21.18N) Density polyethylene LDPE3 having a density of 7.0 g / 10 min: Low density polyethylene EVA having a density of 0.918 g / cm 3 and MFR (190 ° C., 21.18 N) of 7.2 g / 10 min: Density of 0.1. 945 g / cm 3 , MFR (190 ° C., 21.18 N) 7.0 g / 10 min, ethylene-vinyl acetate copolymer having a vinyl acetate content of 15%

[第2樹脂層(B)に用いた樹脂]
LLDPE3:密度が0.943g/cm、MFR(190℃、21.18N)が4.0g/10分である直鎖状低密度ポリエチレン
LLDPE5:密度が0.925g/cm、MFR(190℃、21.18N)が4.5g/10分である直鎖状低密度ポリエチレン
LLDPE6:密度が0.920g/cm、MFR(190℃、21.18N)が3.8g/10分である直鎖状低密度ポリエチレン
プロピレン−ブテン−1共重合体:密度が0.890g/cm、MFR(230℃、21.18N)が4.0g/10分であるプロピレン−ブテン−1共重合体
HDPE:密度が0.962g/cm、MFR(190℃、21.18N)が10.8g/10分である高密度ポリエチレン
COPP:密度が0.900g/cm、MFR(230℃、21.18N)7.0g/10分、エチレン由来成分が4%であるプロピレン−エチレン共重合体
LDPE1:密度が0.922g/cm、MFR(190℃、21.18N)が7.0g/10分である低密度ポリエチレン
LDPE2:密度が0.935g/cm、MFR(190℃、21.18N)が8.0g/10分である低密度ポリエチレン
[Resin used for second resin layer (B)]
LLDPE3: linear low density polyethylene LLDPE5 having a density of 0.943 g / cm 3 and MFR (190 ° C., 21.18N) of 4.0 g / 10 min: density of 0.925 g / cm 3 , MFR (190 ° C. 21.18N) 4.5 g / 10 min linear low density polyethylene LLDPE6: density is 0.920 g / cm 3 , MFR (190 ° C., 21.18 N) is 3.8 g / 10 min Linear low density polyethylene propylene-butene-1 copolymer: Propylene-butene-1 copolymer HDPE having a density of 0.890 g / cm 3 and MFR (230 ° C., 21.18 N) of 4.0 g / 10 min. : High density polyethylene COPP having a density of 0.962 g / cm 3 and MFR (190 ° C., 21.18 N) of 10.8 g / 10 min: Density of 0.900 g / cm 3 , MFR (230 ° C., 21.18 N) 7.0 g / 10 min, propylene-ethylene copolymer LDPE 1 having an ethylene-derived component of 4%: density is 0.922 g / cm 3 , MFR (190 ° C., 21. 18N) 7.0 g / 10 min low density polyethylene LDPE2: density 0.935 g / cm 3 and MFR (190 ° C., 21.18 N) 8.0 g / 10 min low density polyethylene

上記の樹脂を表2に示した各樹脂層の組成でそれぞれドライブレンドした。得られたブレンド物を、第1樹脂層(A)用押出機(口径40mm)と、第2樹脂層(B)用押出機(口径50mm)にそれぞれ供給し、共押出法により押出温度250℃でT−ダイから各層の厚さが表2に示した厚さになるように押出し、40℃の水冷金属冷却ロールで冷却した後、ロールに巻き取り、本発明の共押出積層フィルムを得た。次いで、得られたフィルムを、物理的性質を安定化されるため、35℃の熟成室で48時間熟成させた。   Each of the above resins was dry blended with the composition of each resin layer shown in Table 2. The obtained blend was supplied to an extruder for the first resin layer (A) (caliber 40 mm) and an extruder for the second resin layer (B) (caliber 50 mm), respectively, and an extrusion temperature of 250 ° C. by co-extrusion method. Then, each layer was extruded from the T-die so that the thickness of each layer was as shown in Table 2, cooled with a water-cooled metal cooling roll at 40 ° C., and then wound on a roll to obtain a coextruded laminated film of the present invention. . The resulting film was then aged in a aging room at 35 ° C. for 48 hours in order to stabilize the physical properties.

(ラミネートフィルムの作製)
上記の実施例1〜4及び比較例1〜7で得られた共押出積層フィルムの第2樹脂層(B)の上に、二軸延伸ナイロンフィルム(厚さ25μm)を、ポリエステル−ポリウレタン系接着剤を用いてドライラミネート法によりラミネートして、ラミネートフィルムを得た。得られたラミネートフィルムを、物理的性質を安定化されるため、40℃の熟成室で48時間熟成させた。
(Production of laminate film)
On the second resin layer (B) of the coextruded laminated film obtained in Examples 1 to 4 and Comparative Examples 1 to 7, a biaxially stretched nylon film (thickness 25 μm) is bonded to a polyester-polyurethane system. A laminate film was obtained by laminating by a dry laminating method using an agent. The obtained laminate film was aged in an aging room at 40 ° C. for 48 hours in order to stabilize the physical properties.

(シール強度測定用の試験片の作製)
上記で得られたラミネートフィルムの二軸延伸ナイロンフィルムの反対面(共押出積層フィルムの第1樹脂層(A)の面)と、ポリプロピレン製シート(厚さ0.3mm)とを、精密ヒートシーラー(テスター産業株式会社製)を用いてヒートシールした。なお、ヒートシールの条件は、圧力0.59MPa、時間1秒、温度180℃で行った。ヒートシールをしたフィルムを23℃で自然冷却後、15mm幅の短冊状に試験片を切り出して、シール強度測定用の試験片を作製した。得られたシール強度測定用の試験片を用いて、下記の測定及び評価を行った。
(Preparation of test pieces for sealing strength measurement)
The opposite surface of the biaxially stretched nylon film of the laminate film obtained above (the surface of the first resin layer (A) of the coextruded laminated film) and the polypropylene sheet (thickness 0.3 mm) were combined with a precision heat sealer. Heat sealing was performed using (manufactured by Tester Sangyo Co., Ltd.). The heat sealing was performed at a pressure of 0.59 MPa, a time of 1 second, and a temperature of 180 ° C. After the heat-sealed film was naturally cooled at 23 ° C., a test piece was cut into a strip shape having a width of 15 mm to prepare a test piece for measuring the seal strength. The following measurement and evaluation were performed using the obtained test pieces for measuring the seal strength.

(1)加熱前のシール強度の測定及び易開封性の評価
上記で得られたシール強度測定用の試験片を、23℃、50%RHの恒温室において引張試験機(株式会社エー・アンド・ディー製)を用いて、300mm/分の速度で180°剥離を行い、加熱前のシール強度を測定した。得られた加熱前のシール強度の値から、下記の基準によって易開封性を評価した。
○:加熱前のシール強度が4〜15N/15mm。
×:加熱前のシール強度が4N/15mm未満、又は15N/15mmを超える。
(1) Measurement of seal strength before heating and evaluation of easy-opening properties The test pieces for measuring the seal strength obtained above were subjected to a tensile tester (A & Co., Ltd.) in a thermostatic chamber at 23 ° C. and 50% RH. Dea) was used to peel 180 ° at a speed of 300 mm / min, and the seal strength before heating was measured. From the obtained value of the seal strength before heating, easy-openability was evaluated according to the following criteria.
○: Seal strength before heating is 4 to 15 N / 15 mm.
X: The seal strength before heating is less than 4 N / 15 mm or more than 15 N / 15 mm.

(2)加熱中のシール強度測定及び耐レトルト性の評価
上記で得られたシール強度測定用の試験片を、恒温槽を備えた引張試験機(株式会社エー・アンド・ディー製)を用いて、100℃の雰囲気下の恒温槽中へ3分保持後、そのまま恒温槽中において加熱前のシール強度と同じ測定条件で加熱中のシール強度を測定した。得られた加熱中のシール強度の値から、下記の基準のよって耐レトルト性を評価した。
○:加熱中のシール強度が4〜15N/15mm。
×:加熱中のシール強度が4N/15mm未満、又は15N/15mmを超える。
(2) Seal strength measurement during heating and evaluation of retort resistance The test piece for measuring the seal strength obtained above was used with a tensile testing machine (manufactured by A & D Co., Ltd.) equipped with a thermostatic bath. After maintaining for 3 minutes in a thermostatic bath at 100 ° C., the sealing strength during heating was measured in the thermostatic bath under the same measurement conditions as the sealing strength before heating. From the obtained value of the sealing strength during heating, retort resistance was evaluated according to the following criteria.
○: Seal strength during heating is 4 to 15 N / 15 mm.
X: The sealing strength during heating is less than 4 N / 15 mm or more than 15 N / 15 mm.

(3)シール強度保持率
加熱前のシール強度に対する加熱中のシール強度の割合を、下式によって算出し、シール強度保持率として求めた。
シール強度保持率(%)=(加熱中のシール強度/加熱前のシール強度)×100
(3) Seal strength retention rate The ratio of the seal strength during heating to the seal strength before heating was calculated according to the following formula and obtained as the seal strength retention rate.
Seal strength retention rate (%) = (seal strength during heating / seal strength before heating) × 100

上記で得られた測定結果を表1に示す。   The measurement results obtained above are shown in Table 1.

Figure 2007038605
Figure 2007038605

Figure 2007038605
Figure 2007038605

上記の表1及び2に示した結果から、以下のことが分かった。   From the results shown in Tables 1 and 2, the following was found.

易開封性を有し、レトルト殺菌処理等の加熱処理中及び加熱処理後に内容物の漏れを防止し、流通時の破袋等の問題を生じないためには、シール強度が4〜20N/15mm程度であることが必要であるが、実施例1〜4の本発明の共押出積層フィルムは、加熱前のシール強度、加熱中のシール強度ともに、4〜20N/15mmの範囲に入っており、優れた易開封性と耐レトルト性を有することが分かった。また、シール強度保持率も38.1〜53.8%であり、比較例1〜7の5.4〜27.8%と比較して高いことも分かった。   Sealing strength is 4-20N / 15mm in order to have easy-opening properties, prevent leakage of contents during and after heat treatment such as retort sterilization, and prevent problems such as bag breakage during distribution. The coextruded laminated film of the present invention of Examples 1 to 4 is in the range of 4 to 20 N / 15 mm in both the sealing strength before heating and the sealing strength during heating. It was found to have excellent easy-openability and retort resistance. It was also found that the seal strength retention rate was 38.1 to 53.8%, which was higher than 5.4 to 27.8% of Comparative Examples 1 to 7.

比較例1は、第1樹脂層(A)にプロピレン−ブテン−1共重合体を用いたが、第2樹脂層(B)に密度が0.930g/cm未満の直鎖状低密度ポリエチレンを用いた例である。この共押出積層フィルムは、加熱前のシール強度が18.0N/15mmと高く、易開封性が低いことが分かった。また、加熱中のシール強度が大幅に低下して3.0N/15mmとなり、耐レトルト性も低いことが分かった。 In Comparative Example 1, a propylene-butene-1 copolymer was used for the first resin layer (A), but a linear low density polyethylene having a density of less than 0.930 g / cm 3 for the second resin layer (B). It is an example using. This co-extruded laminated film was found to have a high seal strength before heating of 18.0 N / 15 mm and low easy-openability. Further, it was found that the sealing strength during heating was significantly reduced to 3.0 N / 15 mm, and the retort resistance was also low.

比較例2は、第1樹脂層(A)及び第2樹脂層(B)にプロピレン−エチレン共重合体及び低密度ポリエチレンの混合樹脂を用いた例である。この共押出積層フィルムは、加熱前のシール強度が21.5N/15mmと高く、易開封性が低いことが分かった。また、加熱中のシール強度が大幅に低下して3.0N/15mmとなり、耐レトルト性も低いことが分かった。   Comparative Example 2 is an example in which a mixed resin of propylene-ethylene copolymer and low density polyethylene was used for the first resin layer (A) and the second resin layer (B). This co-extruded laminated film was found to have a high sealing strength before heating of 21.5 N / 15 mm and a low easy-opening property. Further, it was found that the sealing strength during heating was significantly reduced to 3.0 N / 15 mm, and the retort resistance was also low.

比較例3は、第1樹脂層(A)にエチレン−酢酸ビニル共重合体を、第2樹脂層(B)に低密度ポリエチレンを用いた例である。この共押出積層フィルムは、加熱前のシール強度が18.5N/15mmと高く、易開封性が低いことが分かった。また、加熱中のシール強度が大幅に低下して1.0N/15mmとなり、耐レトルト性も低いことが分かった。   Comparative Example 3 is an example in which ethylene-vinyl acetate copolymer is used for the first resin layer (A) and low density polyethylene is used for the second resin layer (B). This coextruded laminated film was found to have a high seal strength before heating of 18.5 N / 15 mm and a low easy-opening property. Further, it was found that the sealing strength during heating was significantly reduced to 1.0 N / 15 mm, and the retort resistance was also low.

比較例4は、第1樹脂層(A)にプロピレン−ブテン−1共重合体を用いたが、第2樹脂層(B)中の直鎖状低密度ポリエチレンの含有量を50質量%未満として、プロピレン−ブテン−1共重合体を多く含有した例である。この共押出積層フィルムは、加熱中のシール強度が6.0N/15mmで耐レトルト性を有していたが、加熱前のシール強度が23.0N/15mmと高く、易開封性が低いことが分かった。   In Comparative Example 4, a propylene-butene-1 copolymer was used for the first resin layer (A), but the content of the linear low-density polyethylene in the second resin layer (B) was less than 50% by mass. This is an example containing a large amount of propylene-butene-1 copolymer. This co-extruded laminated film had a sealing strength during heating of 6.0 N / 15 mm and had retort resistance, but the sealing strength before heating was as high as 23.0 N / 15 mm and the ease of opening was low. I understood.

比較例5は、第1樹脂層(A)にプロピレン−ブテン−1共重合体を用いたが、第2樹脂層(B)中の直鎖状低密度ポリエチレンの含有量を50質量%未満として、低密度ポリエチレンを多く含有した例である。この共押出積層フィルムは、加熱前のシール強度が9.0N/15mmと低く、易開封性を有していたが、加熱中のシール強度が大幅に低下し、2.5N/15mmとなり、耐レトルト性が低いことが分かった。   In Comparative Example 5, a propylene-butene-1 copolymer was used for the first resin layer (A), but the content of linear low density polyethylene in the second resin layer (B) was less than 50% by mass. This is an example containing a large amount of low density polyethylene. This co-extruded laminated film had a low sealing strength before heating of 9.0 N / 15 mm and easy opening, but the sealing strength during heating was greatly reduced to 2.5 N / 15 mm. It was found that the retort property was low.

比較例6は、第1樹脂層(A)にプロピレン−エチレン−ブテン−1共重合体及び直鎖状低密度ポリエチレンの混合樹脂を、第2樹脂層(B)に高密度ポリエチレンを用いた例である。この共押出積層フィルムは、加熱前のシール強度が8.0N/15mmと低く、易開封性を有していたが、加熱中のシール強度が大幅に低下し、2.0N/15mmとなり、耐レトルト性が低いことが分かった。   In Comparative Example 6, a mixed resin of propylene-ethylene-butene-1 copolymer and linear low density polyethylene was used for the first resin layer (A), and high density polyethylene was used for the second resin layer (B). It is. This co-extruded laminated film had a low sealing strength before heating of 8.0 N / 15 mm and easy opening, but the sealing strength during heating was greatly reduced to 2.0 N / 15 mm. It was found that the retort property was low.

比較例7は、第1樹脂層(A)にプロピレン−エチレン−ブテン−1共重合体、直鎖状低密度ポリエチレン及び低密度ポリエチレンの混合樹脂を、第2樹脂層(B)に直鎖状低密度ポリエチレン及びプロピレン−エチレン共重合体の混合樹脂を用いた例である。この共押出積層フィルムは、加熱前のシール強度が20.0N/15mmと高く、易開封性が低いことが分かった。また、加熱中のシール強度が大幅に低下して2.5N/15mmとなり、耐レトルト性も低いことが分かった。


In Comparative Example 7, a mixed resin of propylene-ethylene-butene-1 copolymer, linear low density polyethylene and low density polyethylene is used for the first resin layer (A), and linear resin is used for the second resin layer (B). This is an example using a mixed resin of low density polyethylene and propylene-ethylene copolymer. This co-extruded laminated film was found to have a high seal strength before heating of 20.0 N / 15 mm and a low easy-open property. Further, it was found that the sealing strength during heating was significantly reduced to 2.5 N / 15 mm, and the retort resistance was also low.


Claims (7)

プロピレン−ブテン−1共重合体を70〜100質量%含有する第1樹脂層(A)と、密度が0.930〜0.950g/cmである直鎖状低密度ポリエチレン(b)を50〜100質量%含有する第2樹脂層(B)とが積層されていることを特徴とする共押出積層フィルム。 50 first resin layer (A) containing 70-100% by mass of propylene-butene-1 copolymer and 50 linear low density polyethylene (b) having a density of 0.930-0.950 g / cm 3. A co-extruded laminated film, wherein a second resin layer (B) containing ˜100 mass% is laminated. 前記第1樹脂層(A)が、プロピレン−ブテン−1共重合体70〜95質量%と、密度が0.880〜0.930g/cmである直鎖状低密度ポリエチレン(a)5〜30質量%とを含有する樹脂層である請求項1記載の共押出積層フィルム。 The first resin layer (A) is a linear low density polyethylene (a) 5 having a propylene-butene-1 copolymer of 70 to 95% by mass and a density of 0.880 to 0.930 g / cm 3. The coextruded laminated film according to claim 1, which is a resin layer containing 30% by mass. 前記第2樹脂層(B)が、前記直鎖状低密度ポリエチレン(b)75〜95質量%と、プロピレン−ブテン−1共重合体5〜25質量%とを含有する樹脂層である請求項1又は2記載の共押出積層フィルム。 The second resin layer (B) is a resin layer containing 75 to 95% by mass of the linear low-density polyethylene (b) and 5 to 25% by mass of a propylene-butene-1 copolymer. The coextruded laminated film according to 1 or 2. 前記第2樹脂層(B)が、前記直鎖状低密度ポリエチレン(b)50〜90質量%と、プロピレン−ブテン−1共重合体5〜20質量%と、低密度ポリエチレン5〜30質量%とを含有する樹脂層である請求項1又は2記載の共押出積層フィルム。 Said 2nd resin layer (B) is 50-90 mass% of said linear low density polyethylene (b), 5-20 mass% of propylene-butene-1 copolymers, and 5-30 mass% of low density polyethylene. The coextruded laminated film according to claim 1, which is a resin layer containing 全フィルム厚さが25〜70μmであり、かつ第1樹脂層(A)の厚さが1〜15μmである請求項1〜4のいずれか1項記載の共押出積層フィルム。 The coextruded laminated film according to any one of claims 1 to 4, wherein the total film thickness is 25 to 70 µm, and the thickness of the first resin layer (A) is 1 to 15 µm. 請求項1〜5のいずれか1項記載の共押出積層フィルムの第2樹脂層(B)上に、基材がラミネートされていることを特徴とするラミネートフィルム。 A laminate film, wherein a substrate is laminated on the second resin layer (B) of the coextruded laminate film according to any one of claims 1 to 5. ポリプロピレン系樹脂を主成分としたヒートシール面を開口部に有する包装容器が、請求項6記載のラミネートフィルムで封止されていることを特徴とする包装容器。


A packaging container having a heat-sealing surface mainly composed of a polypropylene-based resin at an opening, which is sealed with the laminate film according to claim 6.


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KR20160063312A (en) * 2013-09-27 2016-06-03 디아이씨 가부시끼가이샤 Antifogging multilayer film, laminate using same, and packaging material
WO2018225521A1 (en) * 2017-06-08 2018-12-13 Dic株式会社 Easily unsealable laminate film and packaging container
CN118952605A (en) * 2024-10-15 2024-11-15 山东龙兴塑膜科技股份有限公司 A method for preparing a five-layer co-extruded polyethylene film and its application in silo bags

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WO2015046131A1 (en) * 2013-09-27 2015-04-02 Dic株式会社 Antifogging multilayer film, laminate using same, and packaging material
KR20160061308A (en) * 2013-09-27 2016-05-31 디아이씨 가부시끼가이샤 Antifogging multilayer film, laminate using same, and packaging material
KR20160063312A (en) * 2013-09-27 2016-06-03 디아이씨 가부시끼가이샤 Antifogging multilayer film, laminate using same, and packaging material
JPWO2015046131A1 (en) * 2013-09-27 2017-03-09 Dic株式会社 Anti-fogging multilayer film, laminate using the same, and packaging material
KR102161563B1 (en) * 2013-09-27 2020-10-05 디아이씨 가부시끼가이샤 Antifogging multilayer film, laminate using same, and packaging material
KR102161562B1 (en) * 2013-09-27 2020-10-05 디아이씨 가부시끼가이샤 Antifogging multilayer film, laminate using same, and packaging material
WO2018225521A1 (en) * 2017-06-08 2018-12-13 Dic株式会社 Easily unsealable laminate film and packaging container
JPWO2018225521A1 (en) * 2017-06-08 2019-11-07 Dic株式会社 Easy-open laminated film and packaging container
CN118952605A (en) * 2024-10-15 2024-11-15 山东龙兴塑膜科技股份有限公司 A method for preparing a five-layer co-extruded polyethylene film and its application in silo bags

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