JP2007105134A - Laminated film for infusion bag - Google Patents

Laminated film for infusion bag Download PDF

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JP2007105134A
JP2007105134A JP2005297124A JP2005297124A JP2007105134A JP 2007105134 A JP2007105134 A JP 2007105134A JP 2005297124 A JP2005297124 A JP 2005297124A JP 2005297124 A JP2005297124 A JP 2005297124A JP 2007105134 A JP2007105134 A JP 2007105134A
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resin
laminated film
ethylene
copolymer
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Miki Kubo
美樹 久保
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Shikoku Kakoh Co Ltd
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Shikoku Kakoh Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated film for an infusion bag which is excellent in heat resistance and flexibility at a low cost. <P>SOLUTION: The laminated film for an infusion bag is composed by successively laminating at least an A layer/B layer/C layer/B layer/D layer. The A layer is constituted of a propylene random copolymer resin, the B layer is constituted of a metallocene polypropylene resin or a crystal-ethylene-butylene-crystal copolymer, the C layer is constituted of a metallocene linear low density polyethylene resin, the D layer is constituted of a polyolefin based thermoplastic elastomer or a polyolefin based resin, the A layer is arranged on the outermost layer and the D layer is arranged on the innermost layer. In a preferable form, a gas barrier resin layer composed by successively laminating a modified polyolefin resin layer/polyamide resin layer/ethylene vinylacetate copolymer saponified matter layer/polyamide resin layer/modified polyolefin resin layer is arranged at an optional position between the A layer to D layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は輸液バッグ用積層フィルムに関する。   The present invention relates to a laminated film for an infusion bag.

従来、輸液バッグ用フィルムとして各種のフィルムが提案されているが、その1つとして、内外層がエチレン含有量0.1以上4.0重量%未満のプロピレン−エチレンランダム共重合体であり、中間層がエチレン含有量4.0〜20.0重量%のプロピレン−エチレンランダム共重合体である積層フィルムが知られている(特許文献1)。また、上記の他、通常のポリプロピレン樹脂を利用したフィルムが数多く知られている(特許文献2〜5)。   Conventionally, various films have been proposed as infusion bag films. One of them is a propylene-ethylene random copolymer having an ethylene content of 0.1 or more and less than 4.0% by weight. A laminated film whose layer is a propylene-ethylene random copolymer having an ethylene content of 4.0 to 20.0% by weight is known (Patent Document 1). In addition to the above, many films using ordinary polypropylene resins are known (Patent Documents 2 to 5).

特開昭62−106765号公報JP-A 62-106765 特開平03−15470号公報Japanese Patent Laid-Open No. 03-15470 特開平06−169972号公報Japanese Patent Application Laid-Open No. 06-169972 特開平08−229100号公報Japanese Patent Laid-Open No. 08-229100 特開平09−99036号公報JP 09-99036 A

しかしながら、通常のポリプロピレン樹脂を利用したフィルムは、耐熱性には優れるものの、柔軟性に欠けるため、特に、ピンホールが発生し易いという欠点がある。   However, a film using a normal polypropylene resin is excellent in heat resistance, but lacks flexibility, and thus has a drawback that pinholes are particularly likely to occur.

本発明は、上記実情に鑑みなされたものであり、その目的は、耐熱性および柔軟性に優れ、しかも、低コストである輸液バッグ用積層フィルムを提供することにある。   This invention is made | formed in view of the said situation, The objective is to provide the laminated film for infusion bags which is excellent in heat resistance and a softness | flexibility, and is low-cost.

すなわち、本発明の要旨は、少なくともA層/B層/C層/B層/D層を順次に積層して成り、A層はプロピレンランダム共重合体樹脂、B層はメタロセンポリプロピレン樹脂またはクリスタル・エチレン・ブチレン・クリスタル共重合体、C層はメタロセン線状低密度ポリエチレン樹脂、D層はポリオレフィン系熱可塑性エラストマー又はポリオレフィン系樹脂にて構成され、A層は最外層に配置され、D層は最内層に配置されることを特徴とする輸液バッグ用積層フィルムに存する。   That is, the gist of the present invention is formed by sequentially laminating at least A layer / B layer / C layer / B layer / D layer, the A layer being a propylene random copolymer resin, and the B layer being a metallocene polypropylene resin or crystal The ethylene / butylene / crystal copolymer, the C layer is composed of a metallocene linear low density polyethylene resin, the D layer is composed of a polyolefin-based thermoplastic elastomer or polyolefin resin, the A layer is disposed in the outermost layer, and the D layer is the outermost layer. It exists in the laminated | multilayer film for infusion bags characterized by arrange | positioning in an inner layer.

本発明によれば、特に低温時において問題とされる耐ピンホール性に優れた輸液バッグ用積層フィルムが提供される。   ADVANTAGE OF THE INVENTION According to this invention, the laminated | multilayer film for infusion bags excellent in the pinhole resistance which is a problem especially at the time of low temperature is provided.

以下、本発明を詳細に説明する。本発明の輸液バッグ用積層フィルムは、ヒートシールによって輸液バッグに製袋化される積層フィルムであって、少なくとも、以下のA層/B層/C層/B層/D層を順次に積層して成る。   Hereinafter, the present invention will be described in detail. The laminated film for an infusion bag of the present invention is a laminated film formed into an infusion bag by heat sealing, and at least the following A layer / B layer / C layer / B layer / D layer are sequentially laminated. It consists of

A層は、プロピレンランダム共重合体樹脂(R−PP)にて構成され、輸液バッグにおいては最外層として使用され、その厚さは、通常1〜100μm、好ましくは2〜50μmである。   A layer is comprised with propylene random copolymer resin (R-PP), and is used as an outermost layer in an infusion solution bag, The thickness is 1-100 micrometers normally, Preferably it is 2-50 micrometers.

上記のR−PPはプロピレンと少量のα−オレフィンとのランダム共重合体である。ここで、α−オレフィンとしては、プロピレンを除く、炭素数2〜8のα−オレフィンであり、その具体例としては、エチレン、1−ブテン、3−メチル1−ブテン、3−メチル−1−ペンテン、4−メチル−1−ペンテン、1−オクテン等が挙げられる。これらの中ではエチレンが好ましい。また、上記のα−オレフィンの共重合量は、通常0.1〜5重量%、好ましくは1.5〜4重量%である。R−PPの市販品としては、例えば、日本ポリプロ株式会社製の「ノバテックPP」(商品名)等が挙げられる。   The above R-PP is a random copolymer of propylene and a small amount of α-olefin. Here, the α-olefin is an α-olefin having 2 to 8 carbon atoms excluding propylene, and specific examples thereof include ethylene, 1-butene, 3-methyl 1-butene, 3-methyl-1- Pentene, 4-methyl-1-pentene, 1-octene and the like can be mentioned. Of these, ethylene is preferred. Moreover, the copolymerization amount of said alpha olefin is 0.1 to 5 weight% normally, Preferably it is 1.5 to 4 weight%. Examples of commercially available products of R-PP include “NOVATEC PP” (trade name) manufactured by Nippon Polypro Co., Ltd.

B層は、メタロセンポリプロピレン樹脂(M−PP)又はクリスタル・エチレン・ブチレン・クリスタル共重合体(CEBC)にて構成され、接着剤層として機能し、その厚さは、通常1〜100μm、好ましくは2〜50μmである。   The B layer is composed of a metallocene polypropylene resin (M-PP) or a crystal / ethylene / butylene / crystal copolymer (CEBC) and functions as an adhesive layer. The thickness thereof is usually 1 to 100 μm, preferably 2 to 50 μm.

上記のM−PPはメタロセン触媒を使用して得られたポリプロピレン樹脂であり、そのMIは通常0.1〜20g/min(230℃)である。CEBCのエチレン含有率は通常60〜90%であり、そのMIは通常0.1〜20g/min(230℃)である。M−PPの市販品としては、例えば、日本ポリプロ株式会社製の「ウインテック」(商品名)等が挙げられる。CEBCの市販品としては、例えば、JSR株式会社製の「ダイナロン」(商品名)等が挙げられる。   The above M-PP is a polypropylene resin obtained using a metallocene catalyst, and its MI is usually 0.1 to 20 g / min (230 ° C.). The ethylene content of CEBC is usually 60 to 90%, and its MI is usually 0.1 to 20 g / min (230 ° C.). Examples of commercially available products of M-PP include “Wintec” (trade name) manufactured by Nippon Polypro Co., Ltd. Examples of commercially available products of CEBC include “DYNARON” (trade name) manufactured by JSR Corporation.

C層はメタロセン線状低密度ポリエチレン樹脂(M−LLDPE)にて構成され、中間層として機能し、その厚さは、通常1〜500μm、好ましくは2〜300μmである。   C layer is comprised with a metallocene linear low density polyethylene resin (M-LLDPE), functions as an intermediate | middle layer, The thickness is 1-500 micrometers normally, Preferably it is 2-300 micrometers.

上記のM−LLDPEはメタロセン触媒を使用して得られた線状低密度ポリエチレン樹脂、すなわち、エチレンと炭素数3〜13のα−オレフィンとの共重合体(エチレン含有量:86〜99.5モル%)である。α―オレフィンの具体例としては、プロピレン、ブテン−1、ヘキセン−1、4―メチルペンテン−1、オクテン−1、デセン−1、ドデセン−1等が挙げられる。M−LLDPEのMIは通常0.1〜20g/min(230℃)である。M−LLDPEの市販品としては、例えば、日本ポリエチレン株式会社製の「カーネル」(商品名)等が挙げられる。   The above M-LLDPE is a linear low density polyethylene resin obtained using a metallocene catalyst, that is, a copolymer of ethylene and an α-olefin having 3 to 13 carbon atoms (ethylene content: 86 to 99.5). Mol%). Specific examples of the α-olefin include propylene, butene-1, hexene-1, 4-methylpentene-1, octene-1, decene-1, dodecene-1, and the like. MI of M-LLDPE is usually 0.1 to 20 g / min (230 ° C.). Examples of commercially available products of M-LLDPE include “Kernel” (trade name) manufactured by Nippon Polyethylene Corporation.

D層は、ポリオレフィン系熱可塑性エラストマー(TPO)又はポリオレフィン系樹脂(PO)にて構成され、輸液バッグにおいては最内層(ヒートシール層)として使用され、その厚さは、通常1〜100μm、好ましくは2〜50μmである。   The D layer is composed of a polyolefin-based thermoplastic elastomer (TPO) or a polyolefin-based resin (PO), and is used as an innermost layer (heat seal layer) in the infusion bag, and its thickness is usually 1 to 100 μm, preferably Is 2 to 50 μm.

上記のTPOとしては、例えば、ポリプロピレン中にエチレン・プロピレンゴムを混練機で機械的に分散複合化して製造するコンパウンド型より、重合によりプロピレン中に多量のエチレン・プロピレンゴムを導入するリアクター型オレフィン系熱可塑性エラストマーが好ましい。リアクター型オレフィン系熱可塑性エラストマーの商品としては、例えば、三菱化学株式会社製の「ゼラス」7000シリーズがある。   As the above TPO, for example, a reactor type olefin system in which a large amount of ethylene / propylene rubber is introduced into propylene by polymerization rather than a compound type produced by mechanically dispersing and compounding ethylene / propylene rubber in polypropylene with a kneader. Thermoplastic elastomers are preferred. As a product of the reactor type olefin-based thermoplastic elastomer, for example, there is “Zeras” 7000 series manufactured by Mitsubishi Chemical Corporation.

前記のPOとしては、前述の種類の他、高密度ポリエチレン(HDPE)、中密度ポリエチレン(MDPE)、低密度ポリエチレン(LDPE)、ポリプロピレン(PP)等が挙げられる。   Examples of the PO include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), and polypropylene (PP) in addition to the types described above.

本発明の好ましい態様においては、A層〜D層の間の任意の位置にガスバリヤ性樹脂層が配置される。本発明におけるガスバリヤ性樹脂層は、変性ポリオレフィン樹脂(APO)層/ポリアミド樹脂(PA)層/エチレン−酢酸ビニル共重合体鹸化物(EVOH)層/ポリアミド樹脂(PA)層/変性ポリオレフィン樹脂(APO)層を順次に積層して成り、APO層は接着剤層として機能する。APO層の厚さは、通常1〜100μm、好ましくは2〜50μm、EVOH層の厚さは、通常1〜50μm、好ましくは2〜40μm、PA層の厚さは、通常1〜50μm、好ましくは2〜40μmである。   In the preferable aspect of this invention, a gas barrier resin layer is arrange | positioned in the arbitrary positions between A layer-D layer. The gas barrier resin layer in the present invention comprises a modified polyolefin resin (APO) layer / polyamide resin (PA) layer / saponified ethylene-vinyl acetate copolymer (EVOH) layer / polyamide resin (PA) layer / modified polyolefin resin (APO). ) Layers are sequentially stacked, and the APO layer functions as an adhesive layer. The thickness of the APO layer is usually 1 to 100 μm, preferably 2 to 50 μm, the thickness of the EVOH layer is usually 1 to 50 μm, preferably 2 to 40 μm, and the thickness of the PA layer is usually 1 to 50 μm, preferably 2 to 40 μm.

上記のAPOは、エチレン成分および/またはプロピレン成分を主たる構成成分としたポリオレフィン樹脂にα,β不飽和カルボン酸またはその誘導体を共重合および/またはグラフト重合させて製造される。   The above APO is produced by copolymerizing and / or graft-polymerizing an α, β unsaturated carboxylic acid or a derivative thereof to a polyolefin resin having an ethylene component and / or a propylene component as main constituent components.

上記のポリオレフィン樹脂としては、例えば、ポリエチレン、ポリプロピレン、エチレン−プロピレン共重合体、エチレン−ブテン−1共重合体、エチレン−酢酸ビニル共重合体、エチレン−アクリル酸共重合体、エチレン−エチルアクリル酸共重合体、エチレン−アクリル酸ナトリウム共重合体などが挙げられる。   Examples of the polyolefin resin include polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, and ethylene-ethylacrylic acid. Examples thereof include a copolymer and an ethylene-sodium acrylate copolymer.

上記の共重合されるα,β−不飽和カルボン酸またはその誘導体としては、アクリル酸、メタクリル酸、メチルメタクリル酸、アクリル酸ナトリウム、アクリル酸亜鉛、酢酸ビニル、グリシジルメタクリレート等が挙げられ、分子鎖中に40モル%以内の範囲内で含まれる。共重合変性ポリオレフィン樹脂としては、例えばエチレン−酢酸ビニル共重合体、エチレン−アクリル酸共重合体、エチレン−エチルアクリル酸共重合体、エチレン−アクリル酸ナトリウム共重合体などが挙げられる。   Examples of the α, β-unsaturated carboxylic acid or derivative thereof to be copolymerized include acrylic acid, methacrylic acid, methyl methacrylic acid, sodium acrylate, zinc acrylate, vinyl acetate, glycidyl methacrylate, and the like. It is contained in the range within 40 mol%. Examples of the copolymer-modified polyolefin resin include an ethylene-vinyl acetate copolymer, an ethylene-acrylic acid copolymer, an ethylene-ethylacrylic acid copolymer, and an ethylene-sodium acrylate copolymer.

上記のグラフトされるα,β−不飽和カルボン酸またはその誘導体としては、例えば、アクリル酸、メタクリル酸、エタクリル酸、マレイン酸、フマル酸あるいはこれらの酸無水物、または、これらの酸のエステル等が挙げられる。これらの変性用化合物の中では、特に、無水マレイン酸が好適である。また、グラフト量は、ポリオレフィン樹脂に対し0.01〜25重量%、好ましくは0.05〜1.5重量%の範囲から選択される。   Examples of the grafted α, β-unsaturated carboxylic acid or derivative thereof include acrylic acid, methacrylic acid, ethacrylic acid, maleic acid, fumaric acid, acid anhydrides thereof, and esters of these acids. Is mentioned. Of these modifying compounds, maleic anhydride is particularly preferred. The graft amount is selected from the range of 0.01 to 25% by weight, preferably 0.05 to 1.5% by weight, based on the polyolefin resin.

グラフト反応は、常法に従い、通常、ポリオレフィン樹脂とα,β−不飽和カルボン酸またはその誘導体とを樹脂温度150〜300℃で溶融混合することにより行われる。グラフト反応に際しては、反応を効率よく行なわせるために、α,α′−ビス−t−ブチルパーオキシ−p−ジイソプロピルベンゼン等の有機過酸化物を0.001〜0.05重量%配合するのがよい。   The grafting reaction is usually performed by melt-mixing a polyolefin resin and an α, β-unsaturated carboxylic acid or a derivative thereof at a resin temperature of 150 to 300 ° C. according to a conventional method. In the grafting reaction, 0.001 to 0.05% by weight of an organic peroxide such as α, α'-bis-t-butylperoxy-p-diisopropylbenzene is blended in order to carry out the reaction efficiently. Is good.

前記のPAとしては、(1)3員環以上のラクタム、(2)重合可能なω−アミノ酸、(3)ジアミンとジカルボン酸の各ポリアミド原料の重縮合によって得られる各種のポリアミドを使用することが出来る。   As the PA, various polyamides obtained by polycondensation of each polyamide raw material of (1) a 3-membered or higher lactam, (2) a polymerizable ω-amino acid, and (3) a diamine and a dicarboxylic acid should be used. I can do it.

3員環以上のラクタムとしては、具体的には、ε−カプロラクタム、エナントラクタム、α−ピロリドン、α−ピペリドン等が挙げられ、重合可能なω−アミノ酸としては、具体的には、6−アミノヘキサン酸、7−アミノヘプタン酸、11−アミノウンデカン酸、9−アミノノナン酸などが挙げられる。   Specific examples of the lactam having 3 or more rings include ε-caprolactam, enantolactam, α-pyrrolidone, α-piperidone, and the like, and specific examples of the polymerizable ω-amino acid include 6-amino Examples include hexanoic acid, 7-aminoheptanoic acid, 11-aminoundecanoic acid, and 9-aminononanoic acid.

ジアミンとしては、具体的には、ヘキサメチレンジアミン、ノナメチレンジアミン、ウンデカメチレンジアミン、ドデカメチレンジアミン、メタキシリレンジアミン等が挙げられ、ジカルボン酸としては、具体的には、テレフタル酸、イソフタル酸、アジピン酸、セバチン酸、ドデカン二塩基酸、グルタール酸などが挙げられる。   Specific examples of the diamine include hexamethylene diamine, nonamethylene diamine, undecamethylene diamine, dodecamethylene diamine, and metaxylylene diamine. Specific examples of the dicarboxylic acid include terephthalic acid and isophthalic acid. , Adipic acid, sebacic acid, dodecanedioic acid, glutaric acid and the like.

ポリアミドの具体例としては、ナイロン4、6、7、8、11、12、6・6、6・10、6・11、6・12、6T、6/6・6、6/12、6/6T、6I/6T等が挙げられるが、通常ナイロン6が使用される。   Specific examples of polyamides include nylon 4, 6, 7, 8, 11, 12, 6 · 6, 6 · 10, 6 · 11, 6 · 12, 6T, 6/6 · 6, 6/12, 6 / Although 6T, 6I / 6T, etc. are mentioned, Nylon 6 is usually used.

前記のEVOHはエチレン−ビニルアルコール共重合体であり、そのエチレン単位の含有量は、通常20〜50モル%、好ましくは25〜45モル%、融点は、通常150〜200℃、好ましくは150〜190℃、密度(20℃)は、通常1.00〜1.40g/cm、好ましくは1.10〜1.30g/cmである。 The EVOH is an ethylene-vinyl alcohol copolymer, and the ethylene unit content is usually 20 to 50 mol%, preferably 25 to 45 mol%, and the melting point is usually 150 to 200 ° C., preferably 150 to 190 degreeC and a density (20 degreeC) are 1.00-1.40 g / cm < 3 > normally, Preferably it is 1.10-1.30 g / cm < 3 >.

本発明の輸液バッグ用積層フィルムは、例えば、共押出環状ダイを使用した下向水冷成形法によって製造することが出来る。斯かる方法は、通常、環状ダイの下方にサイズ用リングが内部に備えられた水槽を配置し、当該水槽の下方に安内板と巻取ロールとを順次に配置して成る設備を使用し、そして、環状ダイから複数種類の原料樹脂を実質的に延伸が起こらない様に共押し出しし、サイズ用リングの間を通過させて冷却した後、積層フイルムの円筒体を安内板を通して巻取ロールに供給して折り畳み、ダブルフイルムとして巻き取る方法である。上記の様な水冷法は、空冷法に比して冷却速度が高く、各層間の接着強度が高められ等の利点がある。冷却速度は、冷却水量や冷却水温度で調節することが出来る。   The laminated film for an infusion bag of the present invention can be produced, for example, by a downward water-cooling molding method using a coextruded annular die. Such a method usually uses a facility in which a water tank having a size ring inside is disposed below the annular die, and an an inner plate and a winding roll are sequentially disposed below the water tank. Then, co-extrusion of multiple types of raw resin from the annular die so as not to cause substantial stretching, and after passing through the sizing ring and cooling, the cylindrical body of the laminated film is wound up through the inner plate. It is a method of supplying to a roll, folding, and winding up as a double film. The water cooling method as described above has advantages that the cooling rate is higher than that of the air cooling method, and the adhesive strength between the layers is increased. The cooling rate can be adjusted by the amount of cooling water and the cooling water temperature.

以下、本発明を実施例により更に詳細に説明するが、本発明は、その要旨を超えない限り、以下の実施例に限定されるものではない。なお、以下の例において、次の評価方法を採用した。   EXAMPLES Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited to a following example, unless the summary is exceeded. In the following examples, the following evaluation method was adopted.

(1)耐ピンホール性:
テスター産業社製、ゲルボフレックステスターを使用し、5℃の雰囲気下、回転角度400°、ストローク150mm、速度40往復/分の条件にて積層フィルム(15cm×25cm)を100回屈曲させる。その後、屈曲させた積層フィルムに形成されたピンホールの個数をカウントし、単位面積当りの個数に換算してピンホール発生個数(個/100cm)を算出する。6回の測定における最小値と最大値を求めた。
(1) Pinhole resistance:
Using a Gelboflex tester manufactured by Tester Sangyo Co., Ltd., a laminated film (15 cm × 25 cm) is bent 100 times in an atmosphere of 5 ° C. under conditions of a rotation angle of 400 °, a stroke of 150 mm, and a speed of 40 reciprocations / minute. Thereafter, the number of pinholes formed in the bent laminated film is counted, and the number of pinholes generated (units / 100 cm 2 ) is calculated by converting into the number per unit area. The minimum value and the maximum value in six measurements were obtained.

(2)層間剥離強度:
フィルムのMD方向の長さが20cmで幅が1cmの試料フィルム2枚を切り出し、各試料フィルムについて、その両端部を手で引っ張り中央部を延伸させる。延伸は延伸部の幅が約半分に縮小されるまで行う。これにより、試料フィルムの接着強度の弱い層間にはズレが起こると考えられる(そして、更に接着強度が弱くなる)。
(2) Delamination strength:
Two sample films having a length in the MD direction of 20 cm and a width of 1 cm are cut out, and each sample film is stretched by pulling both ends thereof by hand. Stretching is performed until the width of the stretched portion is reduced to about half. Thereby, it is thought that a shift | offset | difference arises between the interlayers with weak adhesive strength of a sample film (and adhesive strength becomes still weaker).

次いで、各試料フィルムを最内層同士が接する様に積層し、延伸部にインパルスシール加工(シール長さは約1cm)を施す。   Next, each sample film is laminated so that the innermost layers are in contact with each other, and an impulse seal process (the seal length is about 1 cm) is applied to the stretched portion.

次いで、中央部がシールされた2枚の試料フィルムの一端側から各試料フィルムを引き離して剥離する。この剥離操作は未シール加工部に至まで行う。斯かる剥離操作により、積層された2枚の試料フィルムのシール部おいて、試料フィルムの積層構造が部分的に破壊し、前記の接着強度の弱い層からの剥離が始まる。例えば、A層/B層/C層/B層/D層//D層/B層/C層/B層/A層から(A層/B層)と(C層/B層/D層//D層/B層/C層/B層/A層)とに剥離する。一般に、本発明の積層フィルムの場合はB層とC層(C層とB層)との間で層間剥離が起こる。   Next, each sample film is pulled away from one end side of the two sample films sealed at the center and peeled off. This peeling operation is performed up to the unsealed portion. By such a peeling operation, the laminated structure of the sample film is partially broken at the seal portion of the two laminated sample films, and peeling from the layer having low adhesive strength starts. For example, A layer / B layer / C layer / B layer / D layer // D layer / B layer / C layer / B layer / A layer to (A layer / B layer) and (C layer / B layer / D layer) // D layer / B layer / C layer / B layer / A layer). Generally, in the case of the laminated film of the present invention, delamination occurs between the B layer and the C layer (C layer and B layer).

次いで、引き離しを行った側の各試料フィルムの端部を引張試験機にて引っ掛け、速度200mm/minで引っ張り、未延伸部が剥離する時の荷重を測定する。   Next, the end of each sample film on the side where it has been separated is hooked with a tensile tester, pulled at a speed of 200 mm / min, and the load when the unstretched part peels is measured.

実施例1及び2:
表1に示す原料樹脂を使用し、5層共押出環状ダイを使用した下向水冷成形法により、表2に示す層構成の積層フイルムの円筒体を製造した。押出温度は210℃、冷却水温度は21℃、冷却水量10L/min、巻取速度は15m/minとした。得られた円筒体を所定長さにスリットし、一枚の積層フィルムに切り開き、前述の評価に供した。評価結果を表2に示す。
Examples 1 and 2:
A cylindrical body of a laminated film having a layer structure shown in Table 2 was manufactured by a downward water-cooling molding method using a raw material resin shown in Table 1 and using a five-layer coextrusion annular die. The extrusion temperature was 210 ° C., the cooling water temperature was 21 ° C., the cooling water amount was 10 L / min, and the winding speed was 15 m / min. The obtained cylindrical body was slit to a predetermined length, cut into a single laminated film, and subjected to the above-described evaluation. The evaluation results are shown in Table 2.

Figure 2007105134
Figure 2007105134

Figure 2007105134
Figure 2007105134

比較例1:
3層共押出環状ダイを使用した下向水冷成形法により、外層/中間層/内層の層構成の積層フイルムの円筒体を製造した。外層(50μm)及び内層(50μm)には、R−PP(日本ポリプロ株式会社製「ノバテックPP」:グレード名:FG3D)を使用し、中間層(150μm)には、上記のR−PPとスチレン・エチレン・ブチレン・スチレンブロック共重合体(SEBS:旭株式会社製「タフテック」:グレード名:F1053)との7:3重量比の組成物を使用した。
Comparative Example 1:
A cylindrical body of a laminated film having a layer configuration of outer layer / intermediate layer / inner layer was manufactured by a downward water cooling molding method using a three-layer coextrusion annular die. For the outer layer (50 μm) and the inner layer (50 μm), R-PP (“Novatech PP” manufactured by Nippon Polypro Co., Ltd .: Grade name: FG3D) is used, and for the intermediate layer (150 μm), the above R-PP and styrene are used. A 7: 3 weight ratio composition with an ethylene / butylene / styrene block copolymer (SEBS: “Tuftec” manufactured by Asahi Corporation: grade name: F1053) was used.

積層フイルムの円筒体の製造条件は実施例1と同一とした。得られた円筒体を所定長さにスリットし、一枚の積層フィルムに切り開き、前述の評価に供した。耐ピンホール性は1.3〜2.7(個/100cm)であり、層間剥離強度は1,000(g/10min)以上であった。 The production conditions of the cylindrical body of the laminated film were the same as those in Example 1. The obtained cylindrical body was slit to a predetermined length, cut into a single laminated film, and subjected to the above-described evaluation. The pinhole resistance was 1.3 to 2.7 (pieces / 100 cm 2 ), and the delamination strength was 1,000 (g / 10 min) or more.

比較例2:
比較例1において、中間層の構成樹脂をM−LLDPE(日本ポリエチレン株式会社製「カーネル」:グレード名:KF260)に変更した以外は、比較例1と同様にして積層フイルムの円筒体の製造して評価を行った。耐ピンホール性は0〜0.3(個/100cm)であり、層間剥離強度は100(g/10min)以下であった。
Comparative Example 2:
In Comparative Example 1, a laminated film cylindrical body was produced in the same manner as in Comparative Example 1 except that the constituent resin of the intermediate layer was changed to M-LLDPE (Nippon Polyethylene Corporation “Kernel”: Grade name: KF260). And evaluated. The pinhole resistance was 0 to 0.3 (pieces / 100 cm 2 ), and the delamination strength was 100 (g / 10 min) or less.

Claims (4)

少なくともA層/B層/C層/B層/D層を順次に積層して成り、A層はプロピレンランダム共重合体樹脂、B層はメタロセンポリプロピレン樹脂またはクリスタル・エチレン・ブチレン・クリスタル共重合体、C層はメタロセン線状低密度ポリエチレン樹脂、D層はポリオレフィン系熱可塑性エラストマー又はポリオレフィン系樹脂にて構成され、A層は最外層に配置され、D層は最内層に配置されることを特徴とする輸液バッグ用積層フィルム。   At least A layer / B layer / C layer / B layer / D layer are sequentially laminated, the A layer is a propylene random copolymer resin, and the B layer is a metallocene polypropylene resin or a crystal / ethylene / butylene / crystal copolymer. The C layer is composed of a metallocene linear low density polyethylene resin, the D layer is composed of a polyolefin-based thermoplastic elastomer or a polyolefin resin, the A layer is disposed in the outermost layer, and the D layer is disposed in the innermost layer. Laminated film for infusion bags. D層がポリオレフィン系熱可塑性エラストマーである請求項1に記載の輸液バッグ用積層フィルム。   The laminated film for an infusion bag according to claim 1, wherein the D layer is a polyolefin-based thermoplastic elastomer. ポリオレフィン系熱可塑性エラストマーがリアクター型オレフィン系熱可塑性エラストマーである請求項2に記載の輸液バッグ用積層フィルム。   The laminated film for infusion bags according to claim 2, wherein the polyolefin-based thermoplastic elastomer is a reactor-type olefin-based thermoplastic elastomer. 変性ポリオレフィン樹脂層/ポリアミド樹脂層/エチレン−酢酸ビニル共重合体鹸化物層/ポリアミド樹脂層/変性ポリオレフィン樹脂層を順次に積層して成るガスバリヤ性樹脂層がA層〜D層の間の任意の位置に配置されている請求項1〜3の何れかに記載の輸液バッグ用積層フィルム。   A gas barrier resin layer formed by sequentially laminating a modified polyolefin resin layer / polyamide resin layer / saponified ethylene-vinyl acetate copolymer / polyamide resin layer / modified polyolefin resin layer is an arbitrary layer between layers A and D. The laminated film for infusion bags according to any one of claims 1 to 3, which is disposed at a position.
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