JP2020122060A - Heat-shrinkable film, packaging material, molded product, and container - Google Patents
Heat-shrinkable film, packaging material, molded product, and container Download PDFInfo
- Publication number
- JP2020122060A JP2020122060A JP2019013770A JP2019013770A JP2020122060A JP 2020122060 A JP2020122060 A JP 2020122060A JP 2019013770 A JP2019013770 A JP 2019013770A JP 2019013770 A JP2019013770 A JP 2019013770A JP 2020122060 A JP2020122060 A JP 2020122060A
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- JP
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- Prior art keywords
- heat
- film
- shrinkable film
- resin
- less
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Landscapes
- Wrappers (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Laminated Bodies (AREA)
Abstract
Description
本発明は、食品用包装材料、飲料用包装材料、医薬・医療用包装材料、化学品用包装材料、化粧品用包装材料、トイレタリー用包装材料、工業用包装材料、農業資材用包装材料等に好適に利用することができる熱収縮性フィルム、包装資材、成形品、容器に関する。 The present invention is suitable for food packaging materials, beverage packaging materials, pharmaceutical/medical packaging materials, chemical packaging materials, cosmetic packaging materials, toiletry packaging materials, industrial packaging materials, agricultural material packaging materials, and the like. The present invention relates to a heat-shrinkable film, packaging material, molded product, and container that can be used for.
熱収縮性フィルムは、食品、飲料、医薬品、医療品、化学品、化粧品、トイレタリー、工業部材、農業資材等の包装資材として、幅広く利用されており、包装の対象となる物品や包装フィルムに求められる機能も多様化している。例えば、医薬・医療品や化学品、化粧品、トイレタリー用品といった分野では、水分の蒸散により高価な内容物が経時と共に減量するため、予め内容物を多く充填する操作が行われている。そのため、過剰量の充填を減らすために、包装資材に水蒸気バリア性を付与し、内容物の減量抑制が求められるようになってきた。 Heat-shrinkable films are widely used as packaging materials for foods, beverages, pharmaceuticals, medical products, chemicals, cosmetics, toiletries, industrial materials, agricultural materials, etc., and are required for packaging objects and packaging films. The functions that can be used are also diversified. For example, in the fields of medicine/medical products, chemicals, cosmetics, toiletries, etc., the amount of expensive contents decreases over time due to the evaporation of water, and therefore the operation of filling a large amount of contents in advance is performed. Therefore, in order to reduce the excessive amount of filling, it has been required to impart a water vapor barrier property to the packaging material and suppress the reduction of the content.
液状物が充填された容器に対する熱収縮性フィルムとして、一般的にポリスチレン系樹脂、ポリエステル系樹脂、ポリ乳酸系樹脂等のフィルムが使用されるが、これらのフィルムでは、水蒸気透過率が大きく、水蒸気バリア性が要求される用途に用いるには不十分であった。 As a heat-shrinkable film for a container filled with a liquid material, a polystyrene resin, a polyester resin, a polylactic acid resin film or the like is generally used. It was insufficient for use in applications requiring barrier properties.
高い水蒸気バリア性を有する樹脂材料としては、フェノキシ樹脂が知られており、例えば、特許文献１には、フェノキシ樹脂からなる層と、熱可塑性樹脂からなる層を含有する熱収縮性多層フィルムも提案されている。 Phenoxy resin is known as a resin material having a high water vapor barrier property. For example, Patent Document 1 proposes a heat-shrinkable multilayer film containing a layer made of a phenoxy resin and a layer made of a thermoplastic resin. Has been done.
包装資材に用いられる熱収縮性フィルムは、内容物の表記や製品名、使用上の注意事項などの文字や、製品の意匠性、購買意欲を上げるためにデザインされた柄などが印刷されて用いられることが多い。熱収縮性フィルムへの印刷は一般に、グラビア印刷機による多色印刷がなされるため、フィルムが多くの印刷ロールパスを経由する。
さらに、印刷されたフィルムは端部を溶剤塗布しながら観音開き状に折り畳まれ、フィルム端部同士を溶剤シールして筒状のフィルムロールを得る製袋工程を経由する。そして、充填工程において、筒状のフィルムロールよりフィルムが繰り出され、容器の高さ方向の所定の長さに裁断後、容器に装着させ収縮される。
The heat-shrinkable film used for packaging materials is printed with characters such as notation of contents, product name, precautions for use, design of the product, and design designed to motivate purchasing. It is often done. Printing on a heat-shrinkable film is generally performed by multicolor printing by a gravure printing machine, so that the film goes through many printing roll passes.
Further, the printed film is folded in a double door shape while applying the solvent to the edges, and the edges of the film are solvent-sealed to obtain a tubular film roll. Then, in the filling step, the film is unrolled from the tubular film roll, cut into a predetermined length in the height direction of the container, and then attached to the container and contracted.
このように、幾重に渡る二次加工工程のラインの流れ方向において、熱収縮性フィルムの耐破断性が低い場合、工程内でフィルムが破断し、重大な製造トラブルを招くため、熱収縮性フィルムにおける流れ方向の引張破断伸度は、安定した生産を維持するための重要な品質管理項目となっている。
さらに、近年では各工程における生産性向上や設備改良に伴い、印刷、製袋、充填工程はいずれもさらに高速化が進んでおり、常温で測定される引張破断伸度が大きくても、高速化されたラインでは破断が生じる場合もある。
そのため、高速化された二次加工の安定生産のためには、より低温雰囲気下での引張破断伸度の向上が非常に重要となる。これはプラスチックフィルムに温度−時間換算則が成り立つため、低温雰囲気下での挙動が高速雰囲気下での挙動と対応することに起因する。
In this way, in the flow direction of the secondary processing step over several layers, when the resistance to breakage of the heat-shrinkable film is low, the film breaks in the process, leading to serious manufacturing troubles. The tensile elongation at break in the flow direction is an important quality control item for maintaining stable production.
Furthermore, in recent years, printing, bag-making, and filling processes have all become faster due to productivity improvements and equipment improvements in each process, and even if the tensile rupture elongation measured at room temperature is large, the speed is increased. A break may occur in the line that has been cut.
Therefore, in order to stably produce secondary processing at high speed, it is very important to improve tensile elongation at break in a lower temperature atmosphere. This is because the temperature-time conversion rule is established in the plastic film, and the behavior in the low temperature atmosphere corresponds to the behavior in the high speed atmosphere.
ところで、特許文献１は、熱収縮性、酸素および水蒸気などのガスバリヤー性、柔軟性、成形性などに優れるフェノキシ樹脂からなる層と、熱可塑性樹脂からなる層を有する熱収縮性多層フィルムが開示されてはいるが、熱収縮性フィルムとして必要な流れ方向の引張破断伸度や、低温雰囲気下における引張伸度に関しては全く検討されておらず、包装材料等に好適に利用することができる熱収縮性フィルムとしては不十分である。 By the way, Patent Document 1 discloses a heat-shrinkable multilayer film having a layer made of a phenoxy resin having excellent heat shrinkability, gas barrier properties such as oxygen and water vapor, flexibility, and moldability, and a layer made of a thermoplastic resin. However, the tensile rupture elongation in the flow direction required as a heat-shrinkable film and the tensile elongation in a low temperature atmosphere have not been studied at all, and heat that can be suitably used for packaging materials and the like. It is insufficient as a shrinkable film.
本発明は上記課題に鑑みてなされたものであり、水蒸気バリア性、収縮性、耐破断性、耐衝撃性、透明性、剛性に優れた熱収縮性フィルムであり、特に、水蒸気バリア性と二次加工工程における耐破断性に優れた熱収縮性フィルムを提供することにある。 The present invention has been made in view of the above problems, and is a heat-shrinkable film excellent in water vapor barrier property, shrinkability, puncture resistance, impact resistance, transparency, and rigidity, and particularly, a water vapor barrier property and It is to provide a heat-shrinkable film having excellent breakage resistance in the next processing step.
本発明者らは、鋭意検討した結果、上記従来技術の課題を解決し得る熱収縮性フィルムを得ることに成功し、本発明を完成するに至った。 As a result of intensive studies, the present inventors have succeeded in obtaining a heat-shrinkable film that can solve the problems of the above-mentioned conventional techniques, and have completed the present invention.
本発明の熱収縮フィルムは、フェノキシ樹脂（Ａ）とポリエステル系樹脂（Ｂ）との混合樹脂組成物を主成分とする層を少なくとも１層有する熱収縮性フィルムであって、雰囲気温度２３℃、引張速度２００ｍｍ／分の条件下で測定される主収縮方向に直交する方向の引張破断伸度が１００％以上である。 The heat-shrinkable film of the present invention is a heat-shrinkable film having at least one layer containing a mixed resin composition of a phenoxy resin (A) and a polyester resin (B) as a main component, and an ambient temperature of 23° C. The tensile breaking elongation in the direction orthogonal to the main shrinkage direction measured under the condition of the tensile speed of 200 mm/min is 100% or more.
上記熱収縮性フィルムにおいては、雰囲気温度０℃、引張速度１００ｍｍ／分の条件下で測定される主収縮方向に直交する方向の引張破断伸度が１００％以上であることが好ましい。 In the heat-shrinkable film, it is preferable that the tensile elongation at break in the direction orthogonal to the main shrinkage direction measured at an atmospheric temperature of 0° C. and a pulling speed of 100 mm/min is 100% or more.
上記熱収縮性フィルムにおいては、１００℃の温水中に１０秒浸漬したときの主収縮方向の熱収縮率が５０％以上であり、かつ、５０℃の温水中に１０秒浸漬したときの主収縮方向の熱収縮率が、−５％以上５％以下であることが好ましい。 In the heat shrinkable film, the heat shrinkage in the main shrinkage direction when immersed in 100° C. hot water for 10 seconds is 50% or more, and the main shrinkage when immersed in 50° C. hot water for 10 seconds. The heat shrinkage in the direction is preferably -5% or more and 5% or less.
上記熱収縮性フィルムにおいては、透湿度が４０ｇ／ｍ２・ｄａｙ以下であることが好ましい。 In the heat-shrinkable film, the water vapor transmission rate is preferably 40 g/m 2 ·day or less.
本発明は、上記いずれかに記載の熱収縮性フィルムが用いられた包装資材である。 The present invention is a packaging material using the heat-shrinkable film described in any one of the above.
本発明は、上記包装資材が装着された成形品又は容器である。 The present invention is a molded article or container to which the above packaging material is attached.
本発明によれば、水蒸気バリア性、収縮性、耐破断性、耐衝撃性、透明性、剛性に優れた熱収縮性フィルムを得ることができ、特に、水蒸気バリア性と二次加工工程における耐破断性に優れた熱収縮性フィルムを得ることができる。このため、水分の蒸散による内容物の減量抑制が求められる、医薬・医療品や化学品、化粧品、トイレタリー用品の包装用に好適に使用することができる。 According to the present invention, it is possible to obtain a heat-shrinkable film having excellent water vapor barrier properties, shrinkability, puncture resistance, impact resistance, transparency, and rigidity, and in particular, water vapor barrier properties and resistance to secondary processing steps. A heat-shrinkable film having excellent breakability can be obtained. Therefore, it can be suitably used for packaging pharmaceuticals/medical products, chemical products, cosmetics, and toiletry products, which are required to suppress the reduction of the contents due to evaporation of water.
以下、本発明の実施形態の一例としての本発明の熱収縮性フィルム（以下、「本発明のフィルム」と略記することがある。）、包装資材、成形品、容器について説明する。ただし、本発明の範囲が以下に説明する実施形態に限定されるものではない。 Hereinafter, a heat-shrinkable film of the present invention (hereinafter, may be abbreviated as “film of the present invention”), a packaging material, a molded article, and a container as examples of embodiments of the present invention will be described. However, the scope of the present invention is not limited to the embodiments described below.
なお、本明細書において、「主成分」とは、各層を構成する成分の合計を１００質量％したとき、５０質量％以上を占める成分であることを示し、６０質量％以上が好ましく、７０質量％以上がより好ましい。
また、「Ｘ〜Ｙ」（Ｘ、Ｙは任意の数字）と記載した場合、特にことわらない限り「Ｘ以上Ｙ以下」の意と共に、「好ましくはＸより大きい」及び「好ましくはＹより小さい」の意を包含するものである。
また、本明細書における数値範囲の上限値及び下限値は、本発明が特定する数値範囲内から僅かに外れる場合であっても、当該数値範囲内と同様の作用効果を備えている限り本発明の均等範囲に包含するものとする。
In addition, in this specification, a "main component" shows that it is a component which occupies 50 mass% or more when the total of the components which comprise each layer is 100 mass %, 60 mass% or more is preferable and 70 mass% % Or more is more preferable.
In addition, when described as “X to Y” (X and Y are arbitrary numbers), “preferably larger than X” and “preferably smaller than Y” with the meaning of “X or more and Y or less” unless otherwise specified. Is included.
Further, even if the upper limit and the lower limit of the numerical range in the present specification are slightly deviated from the numerical range specified by the present invention, the present invention is not limited as long as the same operational effect as in the numerical range is provided. Shall be included in the equivalent range of.
＜熱収縮性フィルム＞
本発明の熱収縮性フィルムは、フェノキシ樹脂（Ａ）とポリエステル系樹脂（Ｂ）との混合樹脂組成物を主成分とする層を少なくとも１層有する熱収縮性フィルムある。
<Heat-shrinkable film>
The heat-shrinkable film of the present invention is a heat-shrinkable film having at least one layer containing a mixed resin composition of a phenoxy resin (A) and a polyester resin (B) as a main component.
（フェノキシ樹脂（Ａ））
本発明で用いられるフェノキシ樹脂（Ａ）は、下記一般式（１）で表される繰り返し単位を有する樹脂である。該繰り返し単位を有していれば、分子鎖末端の構造は特に限定されるものではない。
(Phenoxy resin (A))
The phenoxy resin (A) used in the present invention is a resin having a repeating unit represented by the following general formula (1). The structure of the terminal of the molecular chain is not particularly limited as long as it has the repeating unit.
また、上記一般式（１）で表される繰り返し単位を有する樹脂において、一般式（１）中のＡが、上記群から選ばれる２種以上の二価の芳香族部分を有する場合、フェノキシ樹脂（Ａ）は共重合体となり、該共重合体も、好適に用いることができる。 Further, in the resin having the repeating unit represented by the general formula (1), when A in the general formula (1) has two or more divalent aromatic moieties selected from the above group, a phenoxy resin (A) becomes a copolymer, and this copolymer can also be preferably used.
本発明のフェノキシ樹脂（Ａ）のガラス転移温度（Ｔｇ）は、５０℃以上、好ましくは５５℃以上、さらに好ましくは６０℃以上であり、かつ１４０℃以下、好ましくは１３０℃以下、さらに好ましくは１１０℃以下であることが望ましい。Ｔｇが５０℃以上あれば、自然収縮が大き過ぎることがなく寸法安定性が良好なフィルムとなりやすく、実用上好ましい。一方、Ｔｇが１４０℃以下であれば、必要に応じて可塑剤等を添加することにより、実用温度域（７０℃以上９０℃以下程度）において充分な熱収縮率を得ることができ、好ましい。
なお、上記Ｔｇは、粘弾性スペクトロメーターＤＶＡ−２００（アイティ計測社製）を用いて、振動周波数１０Ｈｚ、歪み０．１％、昇温速度３℃／分で測定し、得られたデータから損失弾性率（Ｅ”）のピーク値を求め、その時の温度をＴｇとするものである。
The glass transition temperature (Tg) of the phenoxy resin (A) of the present invention is 50° C. or higher, preferably 55° C. or higher, more preferably 60° C. or higher, and 140° C. or lower, preferably 130° C. or lower, further preferably It is preferably 110° C. or lower. When the Tg is 50° C. or more, spontaneous shrinkage is not too large and a film having good dimensional stability is likely to be obtained, which is preferable in practice. On the other hand, when Tg is 140° C. or lower, a plasticizer or the like is added as necessary, whereby a sufficient heat shrinkage rate can be obtained in a practical temperature range (70° C. or higher and 90° C. or lower), which is preferable.
The Tg was measured using a viscoelasticity spectrometer DVA-200 (manufactured by IT Measurement Co., Ltd.) at a vibration frequency of 10 Hz, a strain of 0.1%, and a temperature rising rate of 3° C./min. The peak value of the elastic modulus (E″) is obtained, and the temperature at that time is taken as Tg.
上記フェノキシ樹脂（Ａ）は、非晶性または低結晶性の樹脂であることが好ましく、Ｘ線回折法によって測定される結晶化度が、通常２０％以下であることが好ましく、１０％以下であることがより好ましく、２％以下であることがさらに好ましい。 The phenoxy resin (A) is preferably an amorphous or low crystalline resin, and the degree of crystallinity measured by X-ray diffractometry is usually 20% or less, preferably 10% or less. It is more preferable that it is present, and it is further preferable that it is 2% or less.
上記フェノキシ樹脂（Ａ）の数平均分子量（Ｍｎ）は、５，０００以上が好ましく、８，０００以上がより好ましく、１０，０００以上がさらに好ましい。数平均分子量が５，０００以上であることにより、フェノキシ樹脂（Ａ）に適度な溶融粘度を有することができ、溶融成形を容易にすることができる。また、数平均分子量（Ｍｎ）は、５０，０００以下が好ましく、４０，０００以下がより好ましく、３０，０００以下がさらに好ましい。数平均分子量が５０，０００以下であることにより、フェノキシ樹脂（Ａ）の溶融粘度が高くなりすぎず、溶融成形を容易にすることができる。 The number average molecular weight (Mn) of the phenoxy resin (A) is preferably 5,000 or more, more preferably 8,000 or more, still more preferably 10,000 or more. When the number average molecular weight is 5,000 or more, the phenoxy resin (A) can have an appropriate melt viscosity and can be easily melt-molded. Further, the number average molecular weight (Mn) is preferably 50,000 or less, more preferably 40,000 or less, still more preferably 30,000 or less. When the number average molecular weight is 50,000 or less, the melt viscosity of the phenoxy resin (A) does not become too high, and melt molding can be facilitated.
上記フェノキシ樹脂（Ａ）の重量平均分子量（Ｍｗ）は、１０，０００以上が好ましく、２０，０００以上がより好ましく、３０，０００以上がさらに好ましい。重量平均分子量が１０，０００以上であることにより、フェノキシ樹脂（Ａ）に適度な溶融粘度を有することができ、溶融成形を容易にすることができる。また、重量平均分子量（Ｍｗ）は、１００，０００以下が好ましく、９０，０００以下がより好ましく、８０，０００以下がさらに好ましい。重量平均分子量が１００，０００以下であることにより、フェノキシ樹脂（Ａ）の溶融粘度が高くなりすぎず、溶融成形を容易にすることができる。 The weight average molecular weight (Mw) of the phenoxy resin (A) is preferably 10,000 or more, more preferably 20,000 or more, still more preferably 30,000 or more. When the weight average molecular weight is 10,000 or more, the phenoxy resin (A) can have an appropriate melt viscosity, and the melt molding can be facilitated. The weight average molecular weight (Mw) is preferably 100,000 or less, more preferably 90,000 or less, still more preferably 80,000 or less. When the weight average molecular weight is 100,000 or less, the melt viscosity of the phenoxy resin (A) does not become too high, and melt molding can be facilitated.
上記フェノキシ樹脂（Ａ）は、公知の方法に準じて製造することができ、例えば、米国特許４，６４７，６４８、特開昭５６−１００８２８号公報、特公昭和２８−４４９４号公報、特開昭６２−１０６９２５号公報、特開昭６２−１５２２２号公報、特開平５−７０５８７号公報等に記載されている方法に準じて製造することができる。 The phenoxy resin (A) can be produced according to a known method. For example, US Pat. No. 4,647,648, JP-A-56-100828, JP-B-28-4494, and JP-A-28-4494. It can be produced according to the method described in JP-A-62-106925, JP-A-62-152222, JP-A-5-70587 and the like.
上記フェノキシ樹脂（Ａ）は、市販のものを用いることができる。そのような市販品を例示すれば、ＧａｂｒｉｅｌＰｈｅｎｏｘｉｅｓ社、新日鉄住金化学社、三菱ケミカル社のフェノキシ樹脂を挙げることができる。 As the phenoxy resin (A), a commercially available product can be used. Examples of such commercially available products include phenoxy resins manufactured by Gabriel Phenoxys, Nippon Steel & Sumikin Chemical Co., Ltd., and Mitsubishi Chemical Corporation.
（ポリエステル系樹脂（Ｂ））
本発明で用いられるポリエステル系樹脂（Ｂ）は、主鎖にエステル結合を有する樹脂であれば、特にその種類を限定するものではない。例えばポリエチレンテレフタレートやポリエチレンナフタレート、ポリブチレンテレフタレート、ポリトリメチレンテレフタレート、ポリ−１，４−シクロへキシレンジメチレンテレフタレート、ポリエチレンサクシネート、ポリブチレンサクシネート、ポリ乳酸、ポリ−ε−カプロラクタム等のポリエステル系樹脂などを挙げることができる。中でも、ポリエチレンテレフタレートや、ポリブチレンテレフタレートなどの、ジカルボン酸成分と多価アルコール成分を構成ユニットとする共重合体が好ましい。
(Polyester resin (B))
The polyester resin (B) used in the present invention is not particularly limited as long as it is a resin having an ester bond in the main chain. For example, polyesters such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polytrimethylene terephthalate, poly-1,4-cyclohexylene dimethylene terephthalate, polyethylene succinate, polybutylene succinate, polylactic acid, and poly-ε-caprolactam. Examples thereof include resin. Of these, copolymers having a dicarboxylic acid component and a polyhydric alcohol component as constituent units, such as polyethylene terephthalate and polybutylene terephthalate, are preferable.
本発明において好適に用いることができるポリエステル系樹脂（Ｂ）としては、ジカルボン酸残基とジオール残基とから誘導されるポリエステル系樹脂である。ジカルボン酸残基の例としては、テレフタル酸、イソフタル酸、２−クロロテレフタル酸、２，５−ジクロロテレフタル酸、２−メチルテレフタル酸、４，４−スチルベンジカルボン酸、４，４−ビフェニルジカルボン酸、オルトフタル酸、２，６−ナフタレンジカルボン酸、２，７−ナフタレンジカルボン酸、ビス安息香酸、ビス（ｐ−カルボキシフェニル）メタン、アントラセンジカルボン酸、４，４−ジフェニルエーテルジカルボン酸、４，４−ジフェノキシエタンジカルボン酸、５−Ｎａスルホイソフタル酸、エチレン−ビス−ｐ−安息香酸等の芳香族ジカルボン酸、アジピン酸、セバシン酸、アゼライン酸、ドデカン二酸、１，３−シクロヘキサンジカルボン酸、１，４−シクロヘキサンジカルボン酸等の脂肪族ジカルボン酸またはそれらのエステル誘導体から誘導される残基が挙げられる。これらのジカルボン酸残基は、１種を単独で、または２種以上を含有していてもよい。中でもテレフタル酸残基とエチレングリコール残基とを含むポリエステル樹脂が好適に用いられる。 The polyester resin (B) that can be preferably used in the present invention is a polyester resin derived from a dicarboxylic acid residue and a diol residue. Examples of dicarboxylic acid residues include terephthalic acid, isophthalic acid, 2-chloroterephthalic acid, 2,5-dichloroterephthalic acid, 2-methylterephthalic acid, 4,4-stilbenedicarboxylic acid, 4,4-biphenyldicarboxylic acid. , Orthophthalic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, bisbenzoic acid, bis(p-carboxyphenyl)methane, anthracene dicarboxylic acid, 4,4-diphenyl ether dicarboxylic acid, 4,4-di Aromatic dicarboxylic acids such as phenoxyethane dicarboxylic acid, 5-Na sulfoisophthalic acid, ethylene-bis-p-benzoic acid, adipic acid, sebacic acid, azelaic acid, dodecanedioic acid, 1,3-cyclohexanedicarboxylic acid, 1, Residues derived from aliphatic dicarboxylic acids such as 4-cyclohexanedicarboxylic acid or their ester derivatives are mentioned. These dicarboxylic acid residues may contain one kind alone or may contain two or more kinds. Above all, a polyester resin containing a terephthalic acid residue and an ethylene glycol residue is preferably used.
本発明において、より好ましくはジカルボン酸残基とジオール残基の少なくとも一方が、２種以上の残基からなる混合物である。本明細書では、前記２種以上の残基において、主残基、すなわち質量（モル％）が最多のものを第１残基とし、該第１残基よりも少量のものを第２残基以下の残基（すなわち、第２残基、第３残基・・・）とする。ジカルボン酸残基とジオール残基とをこのような混合物系にすることにより、得られるポリエステル系樹脂の結晶性を低くできるため、結晶化の進行を抑えることができるため好ましい。 In the present invention, more preferably, at least one of the dicarboxylic acid residue and the diol residue is a mixture of two or more kinds of residues. In the present specification, among the two or more types of residues, the main residue, that is, the one having the largest mass (mol %) is defined as the first residue, and the one having a smaller amount than the first residue is defined as the second residue. The following residues (that is, second residue, third residue,...) Are assumed. By using such a mixture system of the dicarboxylic acid residue and the diol residue, the crystallinity of the obtained polyester resin can be lowered, and the progress of crystallization can be suppressed, which is preferable.
好ましいジオール残基の混合物としては、例えば、第１残基として前記エチレングリコール残基、第２残基として１，４−ブタンジオール、ネオペンチルグリコール、ジエチレングリコール、ポリテトラメチレングリコール、及び１，４−シクロヘキサンジメタノールからなる群から選ばれる少なくとも一種から誘導される残基、好ましくは１，４−シクロヘキサンジメタノール残基を用いたものが挙げられる。 Preferred mixtures of diol residues include, for example, the ethylene glycol residue as the first residue, 1,4-butanediol, neopentyl glycol, diethylene glycol, polytetramethylene glycol, and 1,4-as the second residue. Examples thereof include a residue derived from at least one selected from the group consisting of cyclohexanedimethanol, preferably a 1,4-cyclohexanedimethanol residue.
また、好ましいジカルボン酸残基の混合物としては、例えば、第１残基としてテレフタル酸残基、第２残基としてイソフタル酸、１，４−シクロヘキサンジカルボン酸、コハク酸及びアジピン酸からなる群より選ばれる少なくとも一種から誘導される残基、好ましくはイソフタル酸残基を用いたものが挙げられる。 Further, a preferable mixture of dicarboxylic acid residues is, for example, selected from the group consisting of terephthalic acid residue as the first residue, isophthalic acid as the second residue, 1,4-cyclohexanedicarboxylic acid, succinic acid and adipic acid. And a residue derived from at least one of the above, preferably an isophthalic acid residue is used.
前記第２残基以下のジカルボン酸残基及びジオール残基の総量の含有率は、前記ジカルボン酸残基の総量（１００モル％）と前記ジオール残基の総量（１００モル％）との合計（２００モル％）に対して、１０モル％以上、好ましくは２０モル％以上であり、４０モル％以下、好ましくは３５モル％以下である。前記２残基以下の残基の含有率が１０モル％以上であれば、得られるポリエステルの結晶化度を低く抑えることができる。一方、前記２残基以下の残基の含有率が４０モル％以下であれば、第１残基の長所を活かすことができる。 The content of the total amount of the dicarboxylic acid residue and the diol residue of the second residue or less is the sum of the total amount of the dicarboxylic acid residue (100 mol%) and the total amount of the diol residue (100 mol%) ( 200 mol%), 10 mol% or more, preferably 20 mol% or more, 40 mol% or less, preferably 35 mol% or less. When the content of the residues of 2 residues or less is 10 mol% or more, the crystallinity of the obtained polyester can be suppressed to be low. On the other hand, if the content of the residues of 2 residues or less is 40 mol% or less, the advantage of the first residue can be utilized.
例えば、ジカルボン酸残基がテレフタル酸残基であり、ジオール残基の第１残基がエチレングリコール残基、第２残基が１，４−シクロヘキサンジメタノール残基である場合、第２残基である１，４−シクロヘキサンジメタノール残基の含有率は、ジカルボン酸残基であるテレフタル酸残基の総量（１００モル％）と、エチレングリコール残基及び１，４−シクロヘキサンジメタノール残基の総量（１００モル％）との合計（２００モル％）に対して１０モル％以上、好ましくは１５モル％以上、さらに好ましくは２５モル％以上であり、かつ４０モル％以下、好ましくは３８モル％以下、さらに好ましくは３５モル％以下の範囲である。この範囲でジオール残基としてエチレングリコール残基及び１，４−シクロヘキサンジメタノール残基を用いることにより、得られるポリエステルの結晶性がほとんどなくなり、かつ耐破断性も向上できる。 For example, when the dicarboxylic acid residue is a terephthalic acid residue, the first residue of the diol residue is an ethylene glycol residue, and the second residue is a 1,4-cyclohexanedimethanol residue, the second residue is The content of 1,4-cyclohexanedimethanol residues is a total amount of terephthalic acid residues which are dicarboxylic acid residues (100 mol %), ethylene glycol residues, and 1,4-cyclohexanedimethanol residues. 10 mol% or more, preferably 15 mol% or more, more preferably 25 mol% or more, and 40 mol% or less, preferably 38 mol% with respect to the total (200 mol%) of the total amount (100 mol%). The following range is more preferable, and the range is 35 mol% or less. By using an ethylene glycol residue and a 1,4-cyclohexanedimethanol residue as the diol residue in this range, the resulting polyester has almost no crystallinity and can be improved in breakage resistance.
さらに前記の例において、ジカルボン酸残基が第１残基としてテレフタル酸残基、第２残基としてイソフタル酸残基からなる場合、ジカルボン酸残基であるイソフタル酸残基とジオール残基である１，４−シクロヘキサンジメタノール残基との含有率は、テレフタル酸残基及びイソフタル酸残基の総量（１００モル％）と、エチレングリコール残基及び１，４−シクロヘキサンジメタノール残基との総量（１００モル％）の合計（２００モル％）に対して１０モル％以上、好ましくは１５モル％以上、さらに好ましくは２５モル％以上であり、かつ４０ モル％以下、好ましくは３８％モル以下、さらに好ましくは３５モル％以下の範囲である。 Further, in the above example, when the dicarboxylic acid residue is a terephthalic acid residue as the first residue and an isophthalic acid residue as the second residue, it is an isophthalic acid residue and a diol residue which are dicarboxylic acid residues. The content of 1,4-cyclohexanedimethanol residues is the total amount of terephthalic acid residues and isophthalic acid residues (100 mol %) and the total amount of ethylene glycol residues and 1,4-cyclohexanedimethanol residues. 10 mol% or more, preferably 15 mol% or more, more preferably 25 mol% or more, and 40 mol% or less, preferably 38% mol or less, with respect to the total (200 mol%) of (100 mol%), More preferably, it is in the range of 35 mol% or less.
上記ポリエステル系樹脂の屈折率（ｎ１）は、１．５６０以上１．５８０以下、好ましくは１．５６５以上１．５７４以下であることが好ましい。 The refractive index (n1) of the polyester resin is preferably 1.560 or more and 1.580 or less, and more preferably 1.565 or more and 1.574 or less.
上記ポリエステル系樹脂（Ｂ）の固有粘度（ＩＶ）は、０．５ｄｌ／ｇ以上、好ましくは０．６ｄｌ／ｇ以上、さらに好ましくは０．７ｄｌ／ｇ以上であり、かつ１．５ｄｌ／ｇ以下、好ましくは１．２ｄｌ／ｇ以下、さらに好ましくは１．０ｄｌ／ｇ以下である。固有粘度（ＩＶ）が０．５ｄｌ／ｇ以上であれば、フィルム強度特性や耐熱性が低下することを抑えられる。一方、固有粘度が１．５ｄｌ／ｇ以下であれば、延伸張力の増大に伴う破断等を防ぐことができる。 The intrinsic viscosity (IV) of the polyester resin (B) is 0.5 dl/g or more, preferably 0.6 dl/g or more, more preferably 0.7 dl/g or more and 1.5 dl/g or less. , Preferably 1.2 dl/g or less, more preferably 1.0 dl/g or less. When the intrinsic viscosity (IV) is 0.5 dl/g or more, it is possible to prevent deterioration of film strength characteristics and heat resistance. On the other hand, when the intrinsic viscosity is 1.5 dl/g or less, it is possible to prevent breakage and the like due to an increase in stretching tension.
市販の上記ポリエステル系樹脂の例として、「ＰＥＴＧｃｏｐｌｙｅｓｔｅｒ」（イーストマンケミカル社製）、「Ｅｍｂｒａｃｅ」（イーストマンケミカル社製）、「ＰＥＴＧＳＫＹＧＲＥＥＮ」（ＳＫケミカル社製）などが挙げられる。 Examples of commercially available polyester resins include “PET Gcoplyester” (manufactured by Eastman Chemical Co., Ltd.), “Embrace” (manufactured by Eastman Chemical Co., Ltd.), and “PETGSKY GREEN” (manufactured by SK Chemical Co.).
また、耐熱性付与などの観点から、ポリエステル系樹脂（Ｂ）として、ポリエチレンテレフタレート系共重合体、ポリブチレンテレフタレート系共重合体の少なくとも１種を用いることも好ましい。また、ポリエチレンテレフタレート系共重合体と、ポリブチレンテレフタレート系共重合体の混合物をポリエステル系樹脂（Ｂ）として用いることも好ましい。 From the viewpoint of imparting heat resistance, it is also preferable to use at least one of a polyethylene terephthalate copolymer and a polybutylene terephthalate copolymer as the polyester resin (B). It is also preferable to use a mixture of a polyethylene terephthalate copolymer and a polybutylene terephthalate copolymer as the polyester resin (B).
熱収縮性を付与するにあたり、前記ポリエチレンテレフタレート系共重合体と前記ポリブチレンテレフタレート系共重合体の少なくとも１種を用いることにより熱収縮挙動を調整することができる。すなわち、前記ポリエチレンテレフタレート系共重合のガラス転移温度（Ｔｇ）と前記ポリブチレンテレフタレート系共重合体のＴｇは大きく相違するため、双方を混合することにより、熱収縮率が増加する温度範囲を拡大でき、その結果、熱収縮開始からの急激な収縮を抑制できる。 When imparting heat shrinkability, the heat shrinkage behavior can be adjusted by using at least one of the polyethylene terephthalate copolymer and the polybutylene terephthalate copolymer. That is, since the glass transition temperature (Tg) of the polyethylene terephthalate-based copolymer and the Tg of the polybutylene terephthalate-based copolymer are significantly different, it is possible to expand the temperature range in which the heat shrinkage rate increases by mixing both. As a result, it is possible to suppress rapid contraction from the start of thermal contraction.
また、前記ポリエチレンテレフタレート系共重合体と前記ポリブチレンテレフタレート系共重合体の少なくとも１種を用いることにより、前記フェノキシ樹脂（Ａ）と前記ポリエステル系樹脂（Ｂ）の混合樹脂組成物の結晶性も制御することができる。そのため、過度な結晶化による熱収縮性の阻害などを抑制し、耐熱性を付与しつつ、十分な収縮率を付与することができる。 Further, by using at least one of the polyethylene terephthalate-based copolymer and the polybutylene terephthalate-based copolymer, the crystallinity of the mixed resin composition of the phenoxy resin (A) and the polyester resin (B) is also increased. Can be controlled. Therefore, it is possible to suppress inhibition of heat shrinkability due to excessive crystallization, and to provide heat resistance and a sufficient shrinkage rate.
また、本発明で用いられるポリエステル系樹脂（Ｂ）としては、前記ジカルボン酸残基とジオール残基とから誘導されるポリエステル系樹脂以外にも、カルボン酸残基とアルコール残基とを１分子中に持つモノマーを重合したポリエステル樹脂を用いることもできる。特にポリ乳酸や、ポリ−ε−カプロラクタムは剛性、低温収縮性、低自然収縮性を付与することから好適に用いることができる。 As the polyester-based resin (B) used in the present invention, in addition to the polyester-based resin derived from the dicarboxylic acid residue and the diol residue, a carboxylic acid residue and an alcohol residue are contained in one molecule. It is also possible to use a polyester resin obtained by polymerizing the above monomer. In particular, polylactic acid and poly-ε-caprolactam can be preferably used because they impart rigidity, low temperature shrinkability and low natural shrinkability.
（混合樹脂組成物）
本発明のフィルムは、前記フェノキシ樹脂（Ａ）と前記ポリエステル系樹脂（Ｂ）との混合樹脂組成物を主成分とする層を少なくとも１層有する熱収縮性フィルムである。
(Mixed resin composition)
The film of the present invention is a heat-shrinkable film having at least one layer containing a mixed resin composition of the phenoxy resin (A) and the polyester resin (B) as a main component.
前記混合樹脂組成物において、前記フェノキシ樹脂（Ａ）と前記ポリエステル系樹脂（Ｂ）の配合比率は（Ａ）＋（Ｂ）を１００質量％としたとき、（Ａ）／（Ｂ）＝１〜９９質量％／９９〜１質量％であることが好ましく、（Ａ）／（Ｂ）＝５〜９０質量％／９５〜１０質量％であることがより好ましく、（Ａ）／（Ｂ）＝１０〜８０質量％／９０〜２０質量％であることが更に好ましく、（Ａ）／（Ｂ）＝１０〜６０質量％／９０〜４０質量％であることが最も好ましい。前記混合樹脂組成物において、前記フェノキシ樹脂（Ａ）の配合比率が１質量％以上であれば、水蒸気バリア性が向上し好ましく、９９質量％以下であれば、フィルムの製膜性や延伸性が良好となり好ましい。 In the mixed resin composition, the compounding ratio of the phenoxy resin (A) and the polyester resin (B) is (A)/(B)=1 to 1 when (A)+(B) is 100% by mass. It is preferably 99% by mass/99 to 1% by mass, more preferably (A)/(B)=5 to 90% by mass/95 to 10% by mass, and (A)/(B)=10. -80 mass%/90-20 mass% is more preferable, and (A)/(B)=10-60 mass%/90-40 mass% is the most preferable. In the mixed resin composition, if the compounding ratio of the phenoxy resin (A) is 1% by mass or more, the water vapor barrier property is improved, and if it is 99% by mass or less, the film forming property and stretchability of the film are improved. It is good and preferable.
前記混合樹脂組成物には、フィルムの滑り性付与やブロッキング防止のため、非相溶性の樹脂をブレンドする手法や、アンチブロッキング剤と呼ばれるものを添加することが好ましい。 To the above-mentioned mixed resin composition, it is preferable to add a method of blending an incompatible resin or what is called an anti-blocking agent in order to impart slipperiness of the film and prevent blocking.
前記アンチブロッキング剤を例示すると、シリカ、タルク、炭酸カルシウムなどの無機粒子、無機酸化物、炭酸塩、または、架橋アクリル系、架橋ポリエステル系、架橋ポリスチレン系、シリコーン系等の有機粒子などが挙げられる。また、多段階で重合せしめた多層構造を形成した有機粒子も用いることができる。中でも、シリカや有機粒子が好ましく用いられる。 Examples of the anti-blocking agent include inorganic particles such as silica, talc, and calcium carbonate, inorganic oxides, carbonates, or organic particles such as cross-linked acrylics, cross-linked polyesters, cross-linked polystyrenes, and silicones. .. Further, organic particles having a multi-layered structure which is polymerized in multiple stages can also be used. Of these, silica and organic particles are preferably used.
前記アンチブロッキング剤はフィルム表面を荒らすことにより、滑り性や耐ブロッキング性を発現させるため、適切な添加量、及び、種類を選択しなければ、透明性や、フィルムの光沢を阻害してしまう。上記アンチブロッキング剤の添加量は、構成する樹脂組成物全体の質量を基準（１００質量％）として、０．０１質量％以上、好ましくは０．０１５質量％以上、さらに好ましくは０．０２質量％以上であり、かつ、２質量％以下、好ましくは１．５質量％以下、さら好ましくは１質量％以下とすることが望ましい。前記アンチブロッキング剤の添加量が少なすぎる（０．０１質量％未満）と、フィルム表面へアンチブロッキング剤が析出しづらく、フィルム表面に凹凸を形成しづらいため、十分な滑り性や耐ブロッキング性を発現しづらい。また、逆にアンチブロッキング剤が多すぎる（２質量％超）と、フィルム表面の過剰な凹凸が生じやすく、表面荒れによる透明性の阻害や、過剰な滑り性の付与によるフィルムロールの巻きづれなどが生じやすい。 Since the anti-blocking agent develops slipperiness and blocking resistance by roughening the film surface, transparency and gloss of the film are impaired unless an appropriate addition amount and type are selected. The amount of the anti-blocking agent added is 0.01% by mass or more, preferably 0.015% by mass or more, and more preferably 0.02% by mass, based on the mass (100% by mass) of the entire resin composition constituting the composition. It is desirable that the amount is not less than 2% by mass, preferably 2% by mass or less, preferably 1.5% by mass or less, and more preferably 1% by mass or less. If the amount of the anti-blocking agent added is too small (less than 0.01% by mass), it is difficult to deposit the anti-blocking agent on the film surface and it is difficult to form irregularities on the film surface, so that sufficient slipperiness and blocking resistance are obtained. It is hard to express. On the other hand, if the anti-blocking agent is too much (more than 2% by mass), excessive unevenness of the film surface is likely to occur, which hinders transparency due to surface roughening and film roll winding due to excessive slippage. Is likely to occur.
前記アンチブロッキング剤の形状は、特に限定されるものではないが、凝集抑制、均一分散の観点、透過する光の乱反射抑制、及びフィルム表面に形成される凹凸の観点から球状のものが好ましく用いられる。前記アンチブロッキング剤の平均粒径は、０．５μｍ以上、好ましくは１μｍ以上であり、かつ、１０μｍ以下、好ましくは８μｍ以下、さらに好ましくは６μｍ以下であることが望ましい。前記アンチブロッキング剤の平均粒径が小さすぎる（０．５μｍ未満）と、表面へ析出しづらく、また、表面に析出したアンチブロッキング剤においても、滑り性や耐ブロッキング性を発現するに十分な凹凸を付与しづらい。一方、前記アンチブロッキング剤の平均粒径が大きすぎる（１０μｍ超）と、本発明のフィルムに印刷を施し、意匠性を高める場合において、インキ抜けなどが生じやすく、印刷図柄の外観を損ねるため好ましくない。前記アンチブロッキング剤の粒径の分布は、特に制限されるものではないが、前記粒径の大小による弊害の関係より、粒径分布が狭いものの方が好ましい。粒径分布が広くなりすぎると、前述した好ましく用いられる粒径の範囲より逸脱するものが含まれる可能性があり、好ましくない。 The shape of the anti-blocking agent is not particularly limited, but a spherical one is preferably used from the viewpoint of aggregation inhibition, uniform dispersion, irregular reflection of transmitted light, and irregularities formed on the film surface. .. The average particle size of the anti-blocking agent is 0.5 μm or more, preferably 1 μm or more, and 10 μm or less, preferably 8 μm or less, more preferably 6 μm or less. If the average particle size of the anti-blocking agent is too small (less than 0.5 μm), it is difficult to deposit on the surface, and even in the anti-blocking agent deposited on the surface, unevenness sufficient to exhibit slipperiness and blocking resistance Is hard to give. On the other hand, if the average particle size of the anti-blocking agent is too large (greater than 10 μm), when the film of the present invention is printed to improve the design, ink loss easily occurs and the appearance of the printed pattern is impaired, which is preferable. Absent. The particle size distribution of the anti-blocking agent is not particularly limited, but it is preferable that the particle size distribution is narrow in view of the adverse effect due to the size of the particle size. If the particle size distribution is too wide, there is a possibility that some particles deviate from the above-mentioned preferred range of particle size, which is not preferable.
（その他の成分）
本発明の熱収縮性フィルムには、必要に応じて、低分子化合物、炭化水素樹脂類、添加物などを含有させることができる。
(Other ingredients)
The heat-shrinkable film of the present invention may contain a low molecular weight compound, a hydrocarbon resin, an additive, etc., if necessary.
（１）低分子化合物
本発明の熱収縮性フィルムに低分子化合物を含有させることにより、フィルムの延伸性や収縮特性の向上と収縮応力の低減が期待できる。
(1) Low molecular weight compound By incorporating the low molecular weight compound into the heat-shrinkable film of the present invention, improvement of stretchability and shrinkage characteristics of the film and reduction of shrinkage stress can be expected.
低分子化合物は、数平均分子量が概略１０，０００以下、通常５，０００以下の範囲の分子量を持つ可塑剤、すなわち添加する相手側の樹脂のガラス転移温度（Ｔｇ）を低下させる機能を備えた化合物であり、含有させた際に外観上分離しない程度の相溶性、特に透明乃至半透明の状態である程度の相溶性を有するものが好ましい。具体的には、通常、塩化ビニル樹脂に対する可塑剤として知られているもの、すなわちフタル酸ジ−ｎ−ブチル、フタル酸ジ−２−エチルヘキシル、フタル酸ジ−ｎ−オクチル、フタル酸ジイソオクチル、フタル酸オクチルデシル、フタル酸ジイソデシル、フタル酸ブチルベンジル、イソフタル酸ジ−２−エチルヘキシル等のフタル酸系可塑剤、アジピン酸ジ−２−エチルヘキシル、アジピン酸ジ−ｎ−デシル、アジピン酸ジイソデシル、セバシン酸ジブチル、セバシン酸ジ−２−エチルヘキシル等の脂肪族エステル系可塑剤、トリメリット酸トリオクチル、トリメリット酸トリデシル等のトリメリット酸系可塑剤、ピロメリット酸テトラオクチル等のピロメリット酸系可塑剤、リン酸トリブチル、リン酸トリ−２−エチルヘキシル、リン酸２−エチルヘキシルジフェニル、リン酸トリクレジル等のリン酸エステル系可塑剤、ジオクチルアジペート、ジオクチルセバケート等の脂肪族二塩基酸エステル類、エポキシ化大豆油、エポキシ化アマニ油、エポキシ化ヒマシ油、エポキシ化サフラワー油、エポキシステアリン酸エステル、エポキシヘキサヒドロフタル酸ジオクチル等のエポキシ系可塑剤や、液状ポリブテン、液状ポリブタジエン、液状ポリイソプレン、液状水素化ポリブタジエン、液状水素化ポリイソプレン、液状ブチルゴム、流動パラフィン等が例示できる。中でも相溶性の観点から、液状ポリブテン、液状ポリブタジエン、液状ポリイソプレン、液状水素化ポリブタジエン、液状水素化ポリイソプレン、及び流動パラフィンから選ばれる少なくとも１種を好適に使用できる。また、上記低分子化合物は単独で、又は２種以上を組み合わせて用いてもよい。 The low molecular weight compound has a function of lowering the glass transition temperature (Tg) of the plasticizer having a number average molecular weight of about 10,000 or less, usually 5,000 or less, that is, the resin on the other side to be added. It is preferable that the compound is a compound having compatibility to the extent that it does not separate in appearance when contained, and particularly having compatibility to some extent in a transparent or translucent state. Specifically, those generally known as plasticizers for vinyl chloride resins, namely, di-n-butyl phthalate, di-2-ethylhexyl phthalate, di-n-octyl phthalate, diisooctyl phthalate, phthalate. Phthalate plasticizers such as octyldecyl acid, diisodecyl phthalate, butylbenzyl phthalate, di-2-ethylhexyl isophthalate, di-2-ethylhexyl adipate, di-n-decyl adipate, diisodecyl adipate, sebacic acid Dibutyl, aliphatic ester plasticizers such as di-2-ethylhexyl sebacate, trioctyl trimellitate, trimellitic acid plasticizers such as tridecyl trimellitate, pyromellitic acid plasticizers such as tetraoctyl pyromellitic acid, Phosphate ester plasticizers such as tributyl phosphate, tri-2-ethylhexyl phosphate, 2-ethylhexyl diphenyl phosphate, tricresyl phosphate, aliphatic dibasic acid esters such as dioctyl adipate, dioctyl sebacate, large epoxidation Epoxy plasticizers such as soybean oil, epoxidized linseed oil, epoxidized castor oil, epoxidized safflower oil, epoxy stearic acid ester, dioctyl epoxy hexahydrophthalate, liquid polybutene, liquid polybutadiene, liquid polyisoprene, liquid hydrogenation Examples thereof include polybutadiene, liquid hydrogenated polyisoprene, liquid butyl rubber, liquid paraffin and the like. Among them, from the viewpoint of compatibility, at least one selected from liquid polybutene, liquid polybutadiene, liquid polyisoprene, liquid hydrogenated polybutadiene, liquid hydrogenated polyisoprene, and liquid paraffin can be preferably used. The low molecular weight compounds may be used alone or in combination of two or more.
上記低分子化合物の添加量は、前記混合樹脂組成物１００質量部に対し、１質量部以上、好ましくは２質量部以上であり、かつ１５質量部以下、好ましくは１０質量部以下の範囲で含有させることができる。低分子化合物の含有量が前記混合樹脂組成物１００質量部に対して１質量部以上であれば、フィルムの延伸性が良好であり、かつフィルムの低温収縮特性と収縮応力が十分に抑制され好ましい。一方、含有量が１５質量部以下であれば、経時的にフィルム表面がブリードしてフィルム同士がブロッキングすることを抑えられるとともに、耐衝撃性の低下を抑えられるため好ましい。 The amount of the low-molecular compound added is 1 part by mass or more, preferably 2 parts by mass or more, and 15 parts by mass or less, preferably 10 parts by mass or less, relative to 100 parts by mass of the mixed resin composition. Can be made. When the content of the low molecular weight compound is 1 part by mass or more relative to 100 parts by mass of the mixed resin composition, the stretchability of the film is good, and the low temperature shrinkage property and shrinkage stress of the film are sufficiently suppressed, which is preferable. .. On the other hand, when the content is 15 parts by mass or less, it is preferable that the film surface is prevented from bleeding and the films are blocked from each other, and the impact resistance is prevented from being lowered.
上記低分子化合物は、市販のものを用いることができる。そのような市販品を例示すれば、ＪＸＴＧエネルギー社製の商品名「日石ポリブテン」、日本曹達社製「ＮＩＳＳＯ−ＰＢ」、ＡＤＥＫＡ社製の商品名「アデカサイザー」、出光興産社製の商品名「ダイアナプロセスオイル」等が挙げられる。 As the low molecular weight compound, a commercially available one can be used. Examples of such commercially available products include the product name “Nisseki Polybutene” manufactured by JXTG Energy Co., “NISSO-PB” manufactured by Nippon Soda Co., Ltd., the product name “Adeka Sizer” manufactured by ADEKA, and the product manufactured by Idemitsu Kosan Co., Ltd. The name "Diana process oil" etc. are mentioned.
（２）炭化水素樹脂類
本発明の熱収縮性フィルムに、炭化水素樹脂類を含有させることにより、フィルム表面の光沢度や収縮特性が向上するという効果が得られる。
(2) Hydrocarbon Resins By incorporating hydrocarbon resins into the heat-shrinkable film of the present invention, the effect of improving the glossiness and shrinkage characteristics of the film surface can be obtained.
前記炭化水素樹脂類としては、例えば、石油樹脂として、シクロペンタジエン又はその二量体からの脂環式石油樹脂やＣ９成分からの芳香族石油樹脂等が例示でき、また、テルペン樹脂として、β−ピネンからのテルペン樹脂やテルペン−フェノール樹脂等が例示でき、また、ロジン系樹脂として、ガムロジン、ウッドロジン等のロジン樹脂、グリセリンやペンタエリスリトール等で変性したエステル化ロジン樹脂等が例示できる。 Examples of the hydrocarbon resins include alicyclic petroleum resins derived from cyclopentadiene or a dimer thereof and aromatic petroleum resins derived from C9 component as petroleum resins, and β- Examples include terpene resins from pinene and terpene-phenol resins, and examples of rosin-based resins include rosin resins such as gum rosin and wood rosin, and esterified rosin resins modified with glycerin, pentaerythritol, and the like.
炭化水素樹脂類が石油樹脂、テルペン系樹脂、ロジン系樹脂又はこれらの水素添加物のいずれかである場合、それらの分子量に応じた種々の軟化温度を有する樹脂が存在するが、本発明では、軟化温度が１００℃以上、好ましくは１１０℃以上であり、かつ１５０℃以下、好ましくは１４０℃以下のものが好適に用いられる。炭化水素樹脂類の軟化温度が１００℃以上であれば、経時的にフィルム表面にブリードし、ブロッキングを招いたり、フィルム全体の機械的強度が低下して破れやすくなったりすることがなく、実用的に好ましい。一方、軟化温度が１５０℃以下であれば、前記混合樹脂組成物との相溶性が良好に維持され、経時的にブロッキングの発生や透明性の低下を抑えることができる。 When the hydrocarbon resin is a petroleum resin, a terpene resin, a rosin resin or a hydrogenated product thereof, there are resins having various softening temperatures according to their molecular weights, but in the present invention, A softening temperature of 100° C. or higher, preferably 110° C. or higher, and 150° C. or lower, preferably 140° C. or lower is suitably used. If the softening temperature of the hydrocarbon resin is 100° C. or higher, it does not cause bleeding on the film surface over time, causing blocking, or lowering the mechanical strength of the entire film and making it easier to tear. Is preferred. On the other hand, when the softening temperature is 150° C. or lower, the compatibility with the mixed resin composition is favorably maintained, and the occurrence of blocking and the deterioration of transparency can be suppressed over time.
上記炭化水素樹脂類の含有量は、前記混合樹脂組成物１００質量部に対し、２質量部以上、好ましくは５質量部以上であり、かつ４０質量部以下、好ましくは２０質量部以下の範囲であることが望ましい。炭化水素樹脂類の含有量が２質量部以上であれば、フィルム表面の光沢度や収縮特性の向上効果が得られるため好ましい。一方、炭化水素樹脂類の含有量が４０質量部以下であれば、経時的にフィルム表面にブリードし、フィルム同士がブロッキングしたり、耐衝撃性が低下したりするといった問題を抑えることができる。 The content of the hydrocarbon resin is 2 parts by mass or more, preferably 5 parts by mass or more, and 40 parts by mass or less, preferably 20 parts by mass or less, relative to 100 parts by mass of the mixed resin composition. Is desirable. When the content of the hydrocarbon resin is 2 parts by mass or more, the effect of improving the glossiness and shrinkage property of the film surface can be obtained, which is preferable. On the other hand, when the content of the hydrocarbon resin is 40 parts by mass or less, problems such as bleeding on the film surface over time, blocking between the films, and reduction in impact resistance can be suppressed.
上記炭化水素樹脂類は市販品を用いることができ、具体的には三井化学社の商品名「ハイレッツ」、「ペトロジン」、荒川化学工業社の商品名「アルコン」、ヤスハラケミカル社の商品名「クリアロン」、出光興産社の商品名「アイマーブ」、トーネックス社の商品名「エスコレッツ」等の市販品が挙げられる。 As the above-mentioned hydrocarbon resins, commercially available products can be used. Specifically, the product names of Mitsui Chemicals, Inc., “Highlets” and “Petrosin”, the product name of Arakawa Chemical Industries, Ltd., “Alcon”, and the product name of Yasuhara Chemical Co., “Clearon ], commercial products such as Idemitsu Kosan Co., Ltd.'s trade name "I Marb" and Tonex's trade name "Escorets".
（３）他の添加物
さらに、上述した成分の他、本発明の効果を著しく阻害しない範囲で、成形加工性、生産性、熱収縮性フィルムの諸物性等を改良・調整するため、フィルムの耳等のトリミングロス等から発生するリサイクル樹脂や、酸化チタン、カーボンブラック等の顔料、難燃剤、耐候性安定剤、耐熱安定剤、帯電防止剤、溶融粘度改良剤、架橋剤、滑剤、核剤、可塑剤、老化防止剤等の添加剤を適宜含有させても構わない。
(3) Other additives Furthermore, in addition to the above-mentioned components, in order to improve and adjust the molding processability, productivity, various physical properties of the heat-shrinkable film, etc. within a range not significantly impairing the effects of the present invention, Recycled resin generated from trimming loss such as ears, pigments such as titanium oxide and carbon black, flame retardant, weather resistance stabilizer, heat resistance stabilizer, antistatic agent, melt viscosity improver, cross-linking agent, lubricant, nucleating agent Additives such as plasticizers and antiaging agents may be appropriately contained.
（熱収縮性フィルムの層構成）
本発明の熱収縮性フィルムは、前記フェノキシ樹脂（Ａ）と前記ポリエステル系樹脂（Ｂ）との混合樹脂組成物を主成分とする層を少なくとも１層有していればよく、当該層を（Ｉ）層とした場合、（Ｉ）層単層、（Ｉ）層／（ＩＩ）層の２層構成や、（Ｉ）層／（ＩＩ）層／（ＩＩＩ）層、（ＩＩ）層／（Ｉ）層／（ＩＩＩ）層、（Ｉ）層／（ＩＩ）層／（Ｉ）層、（ＩＩ）層／（Ｉ）層／（ＩＩ）層の３層構成などの構成を採用することができ、層数に制限はない。
また、（Ｉ）層以外の層は、（Ｉ）層と共に共押出によって積層としてもよいし、（Ｉ）層を少なくとも１層有するフィルムに、別工程で得たフィルムや不織布、紙、金属などをラミネートして積層してもよい。
(Layer constitution of heat shrinkable film)
The heat-shrinkable film of the present invention only needs to have at least one layer containing a mixed resin composition of the phenoxy resin (A) and the polyester resin (B) as a main component. In the case of the (I) layer, a single layer of (I) layer, a two-layer structure of (I) layer/(II) layer, (I) layer/(II) layer/(III) layer, (II) layer/( It is possible to adopt a three-layer structure such as I layer/(III) layer, (I) layer/(II) layer/(I) layer, and (II) layer/(I) layer/(II) layer. Yes, there is no limit to the number of layers.
Layers other than the (I) layer may be laminated together with the (I) layer by coextrusion, or a film having at least one layer of the (I) layer, a film obtained in another step, a non-woven fabric, paper, metal, etc. May be laminated and laminated.
本発明の熱収縮性フィルムが積層フィルムの場合、（Ｉ）層はその機能を発揮させる点から、１μｍ以上、好ましくは２μｍ以上で、且つ１５μｍ以下の範囲であることが、フィルムの腰（常温での剛性）、耐指紋白化性、収縮仕上がり性、透明性、自然収縮、再生添加性に優れ、かつ精度良く比重分離可能なフィルムがバランス良く得られる観点から望ましい。 When the heat-shrinkable film of the present invention is a laminated film, the layer (I) exhibits a function of 1 μm or more, preferably 2 μm or more and 15 μm or less from the viewpoint of exhibiting its function. Rigidity), fingerprint whitening resistance, shrinkage finish, transparency, natural shrinkage, reproducibility and reproducibility, and it is desirable from the viewpoint of obtaining a film with good specific gravity separation in good balance.
＜熱収縮性フィルムの引張破断伸度＞
（常温引張破断伸度）
本発明の熱収縮性フィルムは、雰囲気温度２３℃、引張速度２００ｍｍ／分の条件下で、ＪＩＳＫ７１２７に準拠して測定される、主収縮方向に直交する方向の引張破断伸度が、１００％以上であることが重要である。より好ましくは１５０％以上、さらに好ましくは２００％以上である。２３℃環境下での引張破断伸度が上記範囲内であれば、印刷・製袋などの工程時にフィルム状物が破断するなどの不具合が生じにくく、好ましい。また被覆物との密着部分から破袋等が発生しにくく、好ましい。なお、主収縮方向に直交する方向は、フィルム状物の引き取り（流れ）方向（又は、ＭＤ）であることが好ましい。
雰囲気温度２３℃での引張破断伸度を上記範囲とするには、配合の調整、製膜工程での押出条件の調整ならびに延伸条件の調整、熱収縮率の調整などを適宜行うことによって調整できる。
<Tensile breaking elongation of heat-shrinkable film>
(Temperature tensile elongation at room temperature)
The heat-shrinkable film of the present invention has a tensile elongation at break of 100% or more in a direction orthogonal to the main shrinkage direction, which is measured according to JISK7127 under the conditions of an atmospheric temperature of 23° C. and a pulling speed of 200 mm/min. Is important. It is more preferably 150% or more, still more preferably 200% or more. When the tensile elongation at break in an environment of 23° C. is within the above range, problems such as breakage of the film-like material are less likely to occur during a process such as printing and bag making, which is preferable. In addition, it is preferable that a bag or the like is less likely to be generated from the contact portion with the coating. The direction orthogonal to the main shrinkage direction is preferably the take-up (flow) direction (or MD) of the film-like material.
The tensile elongation at break at an atmospheric temperature of 23° C. can be adjusted by appropriately adjusting the composition, adjusting the extrusion conditions and the stretching conditions in the film forming step, adjusting the heat shrinkage, and the like. ..
（低温引張破断伸度）
本発明の熱収縮性フィルムは、雰囲気温度０℃、引張速度１００ｍｍ／分の条件下で、ＪＩＳＫ７１２７に準拠して測定される、主収縮方向に直交する方向の引張破断伸度が、１００％以上であることが好ましく、より好ましくは１５０％以上、さらに好ましくは２００％以上である。０℃環境下での引張破断伸度が上記範囲内であれば、印刷・製袋などの工程時にフィルム状物が破断するなどの不具合が生じにくく、好ましい。また被覆物との密着部分から破袋等が発生しにくく、好ましい。なお、主収縮方向に直交する方向は、フィルム状物の引き取り（流れ）方向（又は、ＭＤ）であることが好ましい。
雰囲気温度０℃での引張破断伸度を上記範囲とするには、配合の調整、製膜工程での押出条件の調整ならびに延伸条件の調整、熱収縮率の調整などを適宜行うことによって調整できる。
(Low temperature tensile elongation at break)
The heat-shrinkable film of the present invention has a tensile elongation at break of 100% or more in a direction orthogonal to the main shrinkage direction, which is measured according to JISK7127 under the conditions of an atmospheric temperature of 0° C. and a pulling speed of 100 mm/min. Is more preferable, 150% or more is more preferable, and 200% or more is still more preferable. When the tensile elongation at break in a 0° C. environment is within the above range, problems such as breakage of the film-like material during the processes such as printing and bag making are less likely to occur, which is preferable. In addition, it is preferable that a bag or the like is less likely to be generated from the contact portion with the coating. The direction orthogonal to the main shrinkage direction is preferably the take-up (flow) direction (or MD) of the film-like material.
The tensile rupture elongation at an atmospheric temperature of 0° C. can be adjusted by appropriately adjusting the composition, adjusting the extrusion conditions and the stretching conditions in the film forming step, adjusting the heat shrinkage ratio, and the like. ..
（極低温引張破断伸度）
本発明の熱収縮性フィルムは、雰囲気温度−１０℃、引張速度１００ｍｍ／分の条件下で、ＪＩＳＫ７１２７に準拠して測定される、主収縮方向に直交する方向の引張破断伸度が、１００％以上であることが好ましい。より好ましくは１５０％以上、さらに好ましくは２００％以上である。−１０℃環境下での引張破断伸度が上記範囲内であれば、印刷・製袋などの工程時にフィルム状物が破断するなどの不具合が生じにくく、高速化されたラインにおいても耐破断性を維持できるため、好ましい。また被覆物との密着部分から破袋等が発生しにくく、好ましい。なお、主収縮方向に直交する方向は、フィルム状物の引き取り（流れ）方向（又は、ＭＤ）であることが好ましい。
雰囲気温度−１０℃での引張破断伸度を上記範囲とするには、配合の調整、製膜工程での押出条件の調整ならびに延伸条件の調整、熱収縮率の調整などを適宜行うことによって調整できる。
(Cryogenic tensile elongation at break)
The heat-shrinkable film of the present invention has a tensile elongation at break of 100% in a direction orthogonal to the main shrinkage direction, which is measured according to JISK7127 under the conditions of an ambient temperature of -10°C and a pulling speed of 100 mm/min. The above is preferable. It is more preferably 150% or more, still more preferably 200% or more. When the tensile elongation at break in the environment of −10° C. is within the above range, problems such as breakage of the film-like material during the processes such as printing and bag making are less likely to occur, and the breakage resistance is high even in a speeded up line. Is preferable because it can be maintained. In addition, it is preferable that a bag or the like is less likely to be generated from the contact portion with the coating. The direction orthogonal to the main shrinkage direction is preferably the take-up (flow) direction (or MD) of the film-like material.
In order to adjust the tensile elongation at break at an ambient temperature of -10°C to the above range, adjustment is made by appropriately adjusting the composition, adjusting the extrusion conditions and the stretching conditions in the film forming step, adjusting the heat shrinkage ratio, and the like. it can.
＜熱収縮性フィルムの熱収縮性＞
（熱収縮性）
本発明の熱収縮性フィルムは、１００℃の温水中に１０秒浸漬したときの少なくとも一方向（主収縮方向）の熱収縮率が５０％以上であることが好ましい。また、該一方向は、熱収縮フィルムの押出機からの流れ方向（ＭＤ）を縦方向、その直交方向（ＴＤ）としたとき、押出機からの直交方向（ＴＤ）であることが好ましい。また、容器の収縮ラベルは、収縮加工工程において比較的短時間（数秒〜十数秒程度）で収縮する必要がある。熱収縮率は、熱収縮性フィルムが収縮ラベル用途に適応できるかどうかの可能性を判断する際の指標となる。すなわち、容器のラベル装着用途に工業的に最も多く用いられている収縮加工機は、収縮加工を行う加熱媒体として水蒸気を用いる蒸気シュリンカーと一般に呼ばれているものであり、熱収縮性フィルムは被覆対象物への熱の影響等の点からできるだけ短時間で十分熱収縮することが必要である。
このような工業生産性を考慮すると、上記条件における熱収縮率が５０％以上であれば、収縮加工時間内に十分に被覆対物に密着することができると判断することができる。
<Heat shrinkability of heat shrinkable film>
(Heat shrinkability)
The heat-shrinkable film of the present invention preferably has a heat shrinkage rate of 50% or more in at least one direction (main shrinkage direction) when immersed in warm water of 100° C. for 10 seconds. The one direction is preferably the orthogonal direction (TD) from the extruder when the machine direction (MD) of the heat-shrinkable film from the extruder is the longitudinal direction and the orthogonal direction (TD). Further, the shrink label of the container needs to shrink in a relatively short time (about several seconds to about ten and several seconds) in the shrinking process. The heat shrinkage ratio is an index for judging the possibility of applying the heat shrinkable film to shrink label applications. That is, the shrinking machine that is industrially most used for the application of labels on containers is generally called a steam shrinker that uses steam as a heating medium for shrinking, and the heat shrinkable film is From the standpoint of the effect of heat on the object to be coated, it is necessary to perform sufficient heat shrinkage in the shortest possible time.
In consideration of such industrial productivity, it can be judged that if the heat shrinkage rate under the above conditions is 50% or more, the coating objective can be sufficiently adhered within the shrinking processing time.
また、本発明の熱収縮性フィルムは、９０℃の温水中に１０秒浸漬したときの少なくとも一方向（主収縮方向）の熱収縮率が４０％以上であることが好ましい。また、該一方向は、ＴＤであることが好ましい。また、８０℃の温水中に１０秒浸漬したときの少なくとも一方向（主収縮方向）の熱収縮率が２０％以上であることが好ましい。また、該一方向は、ＴＤであることが好ましい。さらに、７０℃の温水中に１０秒浸漬したときの少なくとも一方向（主収縮方向）の熱収縮率が５％以上であることが好ましい。また、該一方向は、ＴＤであることが好ましい。収縮工程においては、熱収縮性フィルムを被覆対象物に対して完全に被覆する前に、低温で少し収縮（プレシュリンク）させ、被覆対象物へフィルムの位置固定が行われることもある。その際、各温度における収縮率が上述の好ましい範囲にある場合、より低温から少しずつ被覆対象物にフィルムを収縮させることができるため好ましい。 Further, the heat-shrinkable film of the present invention preferably has a heat shrinkage rate of 40% or more in at least one direction (main shrinkage direction) when immersed in 90° C. warm water for 10 seconds. The one direction is preferably TD. Further, it is preferable that the thermal shrinkage rate in at least one direction (main shrinkage direction) when immersed in warm water of 80° C. for 10 seconds is 20% or more. The one direction is preferably TD. Furthermore, it is preferable that the thermal shrinkage in at least one direction (main shrinkage direction) when immersed in 70° C. warm water for 10 seconds is 5% or more. The one direction is preferably TD. In the shrinking step, before the heat-shrinkable film is completely covered on the object to be coated, the film may be slightly shrunk (pre-shrink) at a low temperature to fix the position of the film on the object to be coated. At that time, when the shrinkage ratio at each temperature is within the above-mentioned preferred range, the film can be gradually shrunk to the object to be coated from a lower temperature, which is preferable.
本発明の熱収縮性フィルムの熱収縮率を上記範囲とするためには、例えば、用いる樹脂の特性に応じて各層の樹脂又は樹脂の組成を調整するとともに、延伸手段、延伸温度を適宜調整すればよい。例えば、熱収縮率を増加したい場合には、延伸温度を下げる、延伸倍率を上げる等の手段を採用すればよい。 In order to set the heat shrinkage rate of the heat shrinkable film of the present invention to the above range, for example, while adjusting the resin of each layer or the composition of the resin according to the characteristics of the resin used, the stretching means and the stretching temperature may be appropriately adjusted. Good. For example, when it is desired to increase the heat shrinkage, means such as lowering the stretching temperature and increasing the stretching ratio may be adopted.
また、容器の収縮ラベル用途においては、本発明の熱収縮性フィルムを８０℃の温水中に１０秒浸漬したときの、フィルム主収縮方向と直交する方向の熱収縮率が１０％以下であることが好ましく、７％以下であることがより好ましい。フィルム主収縮方向と直交する方向の熱収縮率が１０％以下のフィルムであれば、収縮後の主収縮方向と直交する方向の寸法自体が短くなったり、収縮後の印刷柄や文字のゆがみ等が生じやすかったり、角型ボトルの場合においては縦ひけ等のトラブルが発生し難く、好ましい。なお、本明細書において「主収縮方向」とは、縦方向（長手方向）と横方向（幅方向）のうち熱収縮率の大きい方向を意味し、例えば、ボトルに装着する場合にはその外周方向に相当する方向を意味する。 Further, in shrink label use of containers, when the heat shrinkable film of the present invention is immersed in warm water at 80° C. for 10 seconds, the heat shrinkage rate in the direction orthogonal to the film main shrinkage direction is 10% or less. Is preferable, and more preferably 7% or less. If the film has a thermal shrinkage rate of 10% or less in the direction orthogonal to the main shrinking direction of the film, the dimension itself in the direction orthogonal to the main shrinking direction after shrinking becomes short, or the printed pattern or characters after the shrinkage are distorted. Is preferred, and in the case of a rectangular bottle, problems such as vertical sinking are unlikely to occur, which is preferable. In the present specification, the “main shrinkage direction” means the direction in which the heat shrinkage rate is large in the vertical direction (longitudinal direction) and the horizontal direction (width direction). It means the direction corresponding to the direction.
（自然収縮率）
本発明の熱収縮性フィルムの自然収縮率はできるだけ小さい方が望ましく、熱収縮性フィルムの自然収縮率は、例えば、３０℃、５０％ＲＨ雰囲気下で３０日間程度放置する条件において２．０％未満であれば一般的には実用上問題を生じにくい。より好ましくは１．５％未満である。本発明の熱収縮性フィルムの自然収縮率を２．０％未満とするためには、前記フェノキシ樹脂（Ａ）をガラス転移温度（Ｔｇ）５０℃以上のものを使用したり、延伸温度を樹脂のガラス転移温度（Ｔｇ）や熱収縮性フィルムに要求される特性によって適宜調整したりすればよい。一般には、概ね６０℃以上１３０℃以下、好ましくは７０℃以上１１０℃以下の範囲で制御すればよい。
そのため、本発明の熱収縮性フィルムの５０℃の温水中に１０秒浸漬したときの主収縮方向の熱収縮率が−５％以上５％以下であることが好ましく、−２％以上２％以下であることがより好ましく、０％であることがさらに好ましい。なお、本発明の熱収縮性フィルムの自然収縮率を２．０％未満とする方法が上記の方法に限定されるものではない。
(Natural shrinkage rate)
The natural shrinkage rate of the heat-shrinkable film of the present invention is preferably as small as possible, and the natural shrinkage rate of the heat-shrinkable film is, for example, 2.0% under the condition of being left in an atmosphere of 30° C. and 50% RH for about 30 days. If it is less than the above range, problems are not likely to occur in practical use. It is more preferably less than 1.5%. In order to reduce the natural shrinkage rate of the heat-shrinkable film of the present invention to less than 2.0%, the phenoxy resin (A) having a glass transition temperature (Tg) of 50° C. or higher is used, or the stretching temperature is set to a resin. It may be appropriately adjusted depending on the glass transition temperature (Tg) and the properties required for the heat-shrinkable film. Generally, the temperature may be controlled in the range of approximately 60°C to 130°C, preferably 70°C to 110°C.
Therefore, the heat shrinkage ratio of the heat shrinkable film of the present invention in the main shrinkage direction when immersed in warm water of 50° C. for 10 seconds is preferably −5% or more and 5% or less, and −2% or more and 2% or less. Is more preferable, and 0% is even more preferable. The method of setting the natural shrinkage rate of the heat-shrinkable film of the present invention to less than 2.0% is not limited to the above method.
＜熱収縮性フィルムの透湿度＞
（透湿度）
本発明の熱収縮性フィルムは、ＪＩＳＺ０２０８（防湿包装材料の透湿度試験方法（カップ法））の諸条件に準拠したて測定した透湿度が４０ｇ／ｍ２・ｄａｙ以下であることが好ましい。より好ましくは３５ｇ／ｍ２・ｄａｙ以下であり、さらに好ましくは３０ｇ／ｍ２・ｄａｙ以下である。透湿度が上記範囲内であれば、水蒸気バリア性として十分な性能を示し、熱収縮性フィルムの装着の有無による内容物の蒸散抑制効果を明確に確認することができる。
<Water vapor permeability of heat-shrinkable film>
(Moisture permeability)
The heat-shrinkable film of the present invention preferably has a moisture permeability of 40 g/m 2 ·day or less measured according to various conditions of JIS Z0208 (moisture permeability test method for moisture-proof packaging materials (cup method)). It is more preferably 35 g/m 2 ·day or less, and even more preferably 30 g/m 2 ·day or less. When the moisture vapor transmission rate is within the above range, sufficient performance as a water vapor barrier property is exhibited, and it is possible to clearly confirm the transpiration suppression effect of the contents depending on whether or not the heat-shrinkable film is attached.
（フィルム厚さ４０μｍ換算の透湿度）
フィルムの透湿度は、フィルムが厚い方が透湿度が小さくなり、薄い方が透湿度が大きくなる。そのため、厚さが異なるフィルムにおける透湿度の優劣を明確にするため、厚さ換算した透湿度を指標の一つに用いる。例えば、厚さｄ（μｍ）のフィルムの透湿度がＸ（ｇ／ｍ２・ｄａｙ）であった場合、フィルム厚さ４０μｍ換算の透湿度Ｙ（ｇ／ｍ２・ｄａｙ）は、Ｙ＝Ｘ・ｄ／４０として算出することができる。
本発明の熱収縮性フィルムは、フィルム厚さ４０μｍ換算の透湿度は、４０ｇ／ｍ２・ｄａｙ以下であることが好ましい。より好ましくは３５ｇ／ｍ２・ｄａｙ以下であり、さらに好ましくは３０ｇ／ｍ２・ｄａｙ以下である。
(Water vapor transmission rate in terms of film thickness of 40 μm)
Regarding the moisture permeability of the film, the thicker the film, the smaller the moisture permeability, and the thinner the film, the greater the moisture permeability. Therefore, in order to clarify the superiority or inferiority of the water vapor transmission rate in the films having different thicknesses, the water vapor transmission rate converted into the thickness is used as one of the indexes. For example, when the water vapor transmission rate of a film having a thickness d (μm) is X (g/m 2 ·day), the water vapor transmission rate Y (g/m 2 ·day) converted to a film thickness of 40 μm is Y=X -It can be calculated as d/40.
The heat-shrinkable film of the present invention preferably has a water vapor transmission rate of 40 g/m 2 ·day or less in terms of film thickness of 40 μm. It is more preferably 35 g/m 2 ·day or less, and further preferably 30 g/m 2 ·day or less.
＜熱収縮性フィルムのその他物性＞
（ヘイズ）
本発明の熱収縮性フィルムの透明性は、通常、ヘイズで１０％以下であることが好ましく、７％以下であることがより好ましく、５％以下であることがさらに好ましい。フィルムのヘイズが１０％以下であれば、クリアーなディスプレー効果が得られるため好ましい。フィルムのヘイズは、ＪＩＳＫ７１３６に準拠して測定することができる。
<Other physical properties of heat-shrinkable film>
(Haze)
The transparency of the heat-shrinkable film of the present invention is usually preferably 10% or less in haze, more preferably 7% or less, and further preferably 5% or less. When the haze of the film is 10% or less, a clear display effect can be obtained, which is preferable. The haze of the film can be measured according to JIS K7136.
（引張弾性率）
本発明の熱収縮性フィルムは、フィルムの腰（常温での剛性）の観点から、フィルム主収縮方向と直交する方向（以下「直交方向」ともいう）の、雰囲気温度２３℃における引張弾性率が１５００ＭＰａ以上であることが好ましく、１６００ＭＰａ以上であることがより好ましく、１７００ＭＰａ以上であることがさらに好ましい。また、フィルム直交方向の引張弾性率の上限は特に制限されないが、通常使用される熱収縮性フィルムの引張弾性率の上限値を考慮すれば、上限値は２５００ＭＰａ〜３０００ＭＰａ程度であるのが好ましい。フィルム直交方向の引張弾性率が１５００ＭＰａ以上であれば、フィルム全体としての腰（常温での剛性）が高く、特にフィルムの厚さを薄くしていった場合にも、容器に製袋したフィルムをラベリングマシン等で被せる際に斜めに被る、フィルムの腰折れ等で歩留まりが低下しやすい等の問題点が発生し難く、好ましい。
(Tensile modulus)
The heat-shrinkable film of the present invention has a tensile elastic modulus at a temperature of 23° C. in the direction orthogonal to the main shrinkage direction of the film (hereinafter also referred to as “orthogonal direction”) from the viewpoint of the stiffness of the film (rigidity at room temperature). The pressure is preferably 1500 MPa or more, more preferably 1600 MPa or more, still more preferably 1700 MPa or more. Further, the upper limit of the tensile elastic modulus in the film orthogonal direction is not particularly limited, but in consideration of the upper limit of the tensile elastic modulus of a heat shrinkable film which is usually used, the upper limit is preferably about 2500 MPa to 3000 MPa. If the tensile elastic modulus in the direction orthogonal to the film is 1500 MPa or more, the rigidity of the film as a whole (rigidity at room temperature) is high, and even when the thickness of the film is reduced, It is preferable because problems such as being obliquely covered with a labeling machine or the like and yield being likely to be lowered due to bending of the film are not likely to occur.
（収縮応力）
本発明の熱収縮性フィルムは、８０℃シリコンオイルに１０秒間浸漬したときのフィルム主収縮方向の最大収縮応力が１０ＭＰａ以下、好ましくは８ＭＰａ以下、さらに好ましくは６ＭＰａ以下であることが好ましい。一方、フィルム主収縮方向の最大収縮応力の下限は、ボトルと熱収縮性フィルムとの密着性を維持する観点から０．５ＭＰａ以上であることが好ましい。フィルム主収縮方向の最大収縮応力が１０ＭＰａ以下であれば、蒸気シュリンカーでのラベル装着時、シュリンカー内の温度斑に対して、フィルムの収縮挙動の異なる部位が発生し難く、斑、皺、アバタ等が発生し難いため、収縮仕上がりが良好となりやすい。
(Shrinkage stress)
The heat-shrinkable film of the present invention preferably has a maximum shrinkage stress in the main shrinkage direction of the film of 10 MPa or less, preferably 8 MPa or less, and more preferably 6 MPa or less when immersed in 80° C. silicon oil for 10 seconds. On the other hand, the lower limit of the maximum shrinkage stress in the film main shrinkage direction is preferably 0.5 MPa or more from the viewpoint of maintaining the adhesiveness between the bottle and the heat shrinkable film. When the maximum shrinkage stress in the film main shrinking direction is 10 MPa or less, when the label is attached with the steam shrinker, it is difficult for a portion having a different shrinkage behavior of the film to occur due to temperature unevenness in the shrinker, and uneven spots, wrinkles, Since shrinkage is unlikely to occur, the shrinkage finish tends to be good.
＜熱収縮性フィルムの厚さ＞
本発明の熱収縮性フィルムの厚さは特に限定されるものではないが、通常１０μｍ以上、好ましくは１５μｍ以上であり、８０μｍ以下、好ましくは７０μｍ以下の厚さである。フィルムの厚さが１０μｍ以上であれば、フィルムのハンドリング性が良好であると共に、十分な水蒸気バリア性を有する。一方、フィルムの厚さが８０μｍ以下であれば透明性や収縮加工性に優れ、経済的にも好ましい。
<Thickness of heat-shrinkable film>
The thickness of the heat-shrinkable film of the present invention is not particularly limited, but is usually 10 μm or more, preferably 15 μm or more, and 80 μm or less, preferably 70 μm or less. When the thickness of the film is 10 μm or more, the film has good handleability and sufficient water vapor barrier property. On the other hand, when the thickness of the film is 80 μm or less, transparency and shrinkability are excellent, which is economically preferable.
また、本発明の熱収縮性フィルムは、必要に応じて、コロナ処理、印刷、コーティング、蒸着等の表面処理や表面加工、さらには、各種溶剤やヒートシールによる製袋加工やミシン目加工等を施すことができる。 Further, the heat-shrinkable film of the present invention, if necessary, surface treatment and surface treatment such as corona treatment, printing, coating, vapor deposition, and further, bag-making processing and perforation processing by various solvents and heat sealing, etc. Can be given.
＜熱収縮性フィルムの製造方法＞
本発明の熱収縮性フィルムは、従来公知の製造方法において条件を適宜変更して製造することができ、特に製造方法が限定されるものではない。
<Method for producing heat-shrinkable film>
The heat-shrinkable film of the present invention can be produced by appropriately changing the conditions in a conventionally known production method, and the production method is not particularly limited.
本発明の熱収縮性フィルムの形態は特に限定されず、平面状、チューブ状の何れであってもよいが、生産性（原反フィルムの幅方向に製品として数丁取りが可能）や内面への印刷可能性等の観点から、平面状の形態であることが好ましい。平面状フィルムの製造方法としては、例えば、複数の押出機を用いて各層で使用する樹脂及び樹脂組成物を溶融し、Ｔダイから共押出し、チルドロールで冷却固化し、縦方向にロール延伸、横方向にテンター延伸をし、その後、アニール、冷却、必要に応じてコロナ放電処理等を経る工程により、１軸又は２軸方向に延伸されたフィルムを製造する方法が例示できる。また、チューブラー法により製造したフィルムを切り開いて平面状フィルムを製造する方法も適用できる。 The form of the heat-shrinkable film of the present invention is not particularly limited, and may be either flat or tubular, but productivity (several products can be taken in the width direction of the original film) and inner surface From the viewpoint of printability and the like, it is preferable that it has a planar shape. As the method for producing a flat film, for example, a resin and a resin composition used in each layer are melted by using a plurality of extruders, coextruded from a T die, cooled and solidified by a chilled roll, and stretched in the longitudinal direction by a roll, A method of producing a uniaxially or biaxially stretched film can be exemplified by the steps of stretching in the transverse direction by tenter, and then annealing, cooling, and if necessary, corona discharge treatment. Further, a method of manufacturing a flat film by cutting open a film manufactured by a tubular method can also be applied.
ここで、押出成形温度は、樹脂及び樹脂の流動特性や製膜性等によって適宜調整されるが、概ね２６０℃以下、好ましくは２００℃以上２５０℃以下の範囲が好適である。 Here, the extrusion molding temperature is appropriately adjusted depending on the resin, the flow characteristics of the resin, the film-forming property, and the like, but it is generally in the range of 260° C. or lower, preferably 200° C. or higher and 250° C. or lower.
延伸温度は、用いる樹脂及び樹脂のガラス転移温度（Ｔｇ）や熱収縮性フィルムに要求される特性により適宜変更する必要があるが、概ね６０℃以上１３０℃以下、好ましくは７０℃以上１１０℃以下の範囲で制御する。また、延伸倍率は、用いる樹脂及び樹脂の特性、延伸手段、延伸温度、目的の製品形態等に応じて、主収縮方向には１．５倍以上１０倍以下、好ましくは３倍以上７倍以下の範囲で適宜決定される。また、横方向に１軸延伸する場合でもフィルムの機械物性改良等の目的で縦方向に１．０５倍以上１．８０倍以下程度の弱延伸を付与することも効果的である。 The stretching temperature needs to be appropriately changed depending on the resin used and the glass transition temperature (Tg) of the resin and the characteristics required for the heat-shrinkable film, but is generally 60°C or higher and 130°C or lower, preferably 70°C or higher and 110°C or lower. Control in the range of. The stretching ratio is 1.5 times or more and 10 times or less, preferably 3 times or more and 7 times or less in the main shrinkage direction, depending on the resin to be used, the characteristics of the resin, the stretching means, the stretching temperature, the intended product form, etc. Is appropriately determined within the range. Further, even in the case of uniaxially stretching in the transverse direction, it is also effective to impart weak stretching of 1.05 times or more and 1.80 times or less in the longitudinal direction for the purpose of improving mechanical properties of the film.
次いで、延伸したフィルムは、必要に応じて、自然収縮率の低減や熱収縮特性の改良等を目的として、５０℃以上１００℃以下程度の温度で熱処理や弛緩処理を行った後、分子配向が緩和しない時間内に速やかに冷却し、熱収縮性フィルムとする。 Next, the stretched film is subjected to a heat treatment or a relaxation treatment at a temperature of about 50° C. or higher and 100° C. or lower for the purpose of reducing the natural shrinkage ratio or improving the heat shrinkage property, if necessary, and then the molecular orientation is It is cooled rapidly within the time that is not relaxed to obtain a heat-shrinkable film.
＜包装資材＞
本発明の熱収縮性フィルムは、各種用途への利用が可能であるが、好ましくは、フィルムの片面又は両面に印刷層を形成して、ガラス製容器やペットボトル等のプラスチック製容器に装着する熱収縮性ラベルなどの包装資材を形成することができる。
<Packaging materials>
The heat-shrinkable film of the present invention can be used for various purposes, but preferably, a printing layer is formed on one side or both sides of the film and mounted on a plastic container such as a glass container or a PET bottle. Packaging materials such as heat shrinkable labels can be formed.
一般に、ラベル用途に用いられる熱収縮性フィルムの表面及び／又は裏面には、全面及び／又は部分的にグラビア印刷、フレキソ印刷、オフセット印刷、バーコータ等の公知方法により印刷層を形成する。印刷層形成に使用される印刷インキは特に限定されず、前記印刷法に応じて適宜選択でき、例えば、溶剤系（非水性）又は水性のアクリル樹脂系やウレタン樹脂系インキ、発泡性インキ、加熱発泡性インキ等を挙げることができる。 Generally, a print layer is formed on the front surface and/or the back surface of a heat-shrinkable film used for a label by a known method such as gravure printing, flexographic printing, offset printing, and bar coater on the whole surface and/or a part thereof. The printing ink used for forming the printing layer is not particularly limited and can be appropriately selected according to the printing method. For example, solvent-based (non-aqueous) or water-based acrylic resin-based or urethane resin-based ink, foaming ink, heating Foaming ink etc. can be mentioned.
ラベル用途の包装資材は、被包装物によってフラット状から円筒状等に加工して包装に供される。ペットボトル等の円筒状の容器で印刷を要するものは、まずロールに巻き取られた広幅のフラットフィルムの一面に必要な画像を印刷し、そしてこれを必要な幅にカットしつつ、印刷面が内側になるように折り畳んでセンターシール（シール部の形状はいわゆる封筒貼り）して円筒状とすればよい。センターシール方法としては、有機溶剤によるシール法、ヒートシールによる方法、接着剤による方法、及びインパルスシーラーによる方法があるが、外観の見栄えを考慮すると、有機溶剤のシール法を用いることが好ましい。 The packaging material for labels is processed into a flat shape, a cylindrical shape, or the like according to the object to be packaged and then provided for packaging. For cylindrical containers such as PET bottles that require printing, first print the required image on one side of the wide flat film wound on a roll, and then cut this to the required width while the printing surface is A cylindrical shape may be obtained by folding the sheet so that it is inward and sealing it with a center seal (the shape of the seal portion is a so-called envelope). As the center sealing method, there are a sealing method using an organic solvent, a method using heat sealing, a method using an adhesive, and a method using an impulse sealer. However, considering the appearance, it is preferable to use the organic solvent sealing method.
＜成形品、容器＞
本発明の熱収縮性フィルムは、フィルムの腰（常温での剛性）、耐指紋白化性、収縮仕上がり性、透明性、再生添加性等の機械的強度等に優れ、かつ自然収縮及び収縮応力が小さいため、成形品又は容器に装着する際、複雑な形状（例えば、中心がくびれた円柱、角のある四角柱、五角柱、六角柱など）の成形品又は容器であっても該形状に密着可能であり、シワやアバタ等のない美麗に装着する包装資材とすることができる。よって、本発明の熱収縮性フィルムを装着する対象物としては、例えば瓶、ボトル（ブローボトル）、トレー、弁当箱、総菜容器、乳製品容器など、様々な形状の成形品又は容器が挙げられる。
特に本発明の熱収縮性フィルムを食品容器（例えば清涼飲料水用又は食品用のＰＥＴボトル、ガラス瓶、好ましくはＰＥＴボトル）用の収縮性ラベルとして用いた場合には、前述のように複雑な形状であっても該形状に密着可能であり、シワやアバタ等のない美麗なラベルが装着された容器が得られる点で特に優れている。
<Molded product, container>
The heat-shrinkable film of the present invention is excellent in mechanical strength such as film stiffness (rigidity at room temperature), fingerprint whitening resistance, shrink finish, transparency, and replenishment addition property, and natural shrinkage and shrinkage stress. Since it is small, even when it is mounted on a molded product or container, even if it is a molded product or container with a complicated shape (for example, a cylinder with a constricted center, a square column with corners, a pentagonal column, a hexagonal column, etc.), it fits closely to the shape. It is possible, and the packaging material can be beautifully mounted without wrinkles or avatars. Therefore, examples of the object on which the heat-shrinkable film of the present invention is mounted include various shaped articles or containers such as bottles, bottles (blow bottles), trays, lunch boxes, side dish containers, and dairy product containers. ..
In particular, when the heat-shrinkable film of the present invention is used as a shrinkable label for food containers (for example, PET bottles for soft drinks or foods, glass bottles, preferably PET bottles), it has a complicated shape as described above. However, it is particularly excellent in that it can be closely attached to the shape, and a container having a beautiful label without wrinkles or avatars can be obtained.
本発明の熱収縮性フィルムは、プラスチック製容器の熱収縮性ラベル素材のほか、熱膨張率や吸水性等が本発明の熱収縮性フィルムとは極めて異なる材質、例えば金属、磁器、ガラス、紙、ポリエチレン、ポリプロピレン、ポリブテン等のポリオレフィン系樹脂、ポリメタクリル酸エステル系樹脂、ポリカーボネート系樹脂、ポリエチレンテレフタレート、ポリブチレンテレフタレート等のポリエステル系樹脂、ポリアミド系樹脂から選ばれる少なくとも１種を構成素材として用いた包装体（容器）の熱収縮性ラベル用途の包装資材として好適に利用できる。 The heat-shrinkable film of the present invention is, in addition to the heat-shrinkable label material of a plastic container, a material whose thermal expansion coefficient and water absorption are extremely different from the heat-shrinkable film of the present invention, for example, metal, porcelain, glass, paper. Polyolefin resin such as polyethylene, polypropylene, polybutene, polymethacrylate ester resin, polycarbonate resin, polyethylene terephthalate, polyester resin such as polybutylene terephthalate, and polyamide resin are used as the constituent material. It can be suitably used as a packaging material for heat shrinkable labels of packaging (container).
本発明の包装資材が装着されたプラスチック製容器体を構成する材質としては、上記の樹脂の他、ポリスチレン、ゴム変性耐衝撃性ポリスチレン（ＨＩＰＳ）、スチレン−ブチルアクリレート共重合体、スチレン−アクリロニトリル共重合体、スチレン−無水マレイン酸共重合体、アクリロニトリル−ブタジエン−スチレン共重合体（ＡＢＳ）、メタクリル酸エステル−ブタジエン−スチレン共重合体（ＭＢＳ）、ポリ塩化ビニル系樹脂、フェノール樹脂、ユリア樹脂、メラミン樹脂、エポキシ樹脂、不飽和ポリエステル樹脂、シリコーン樹脂等を挙げることができる。これらのプラスチック製容器は２種以上の樹脂類の混合物でも、積層体であってもよい。 Examples of the material constituting the plastic container body to which the packaging material of the present invention is attached include polystyrene, rubber-modified impact-resistant polystyrene (HIPS), styrene-butyl acrylate copolymer, styrene-acrylonitrile copolymer, in addition to the above resins. Polymer, styrene-maleic anhydride copolymer, acrylonitrile-butadiene-styrene copolymer (ABS), methacrylic acid ester-butadiene-styrene copolymer (MBS), polyvinyl chloride resin, phenol resin, urea resin, Examples thereof include melamine resin, epoxy resin, unsaturated polyester resin and silicone resin. These plastic containers may be a mixture of two or more kinds of resins or a laminate.
また、本発明の熱収縮性フィルムは、水蒸気バリア性に優れるという特性を有しているので、この特性を生かして、水蒸気の蒸散により内容物が経時に減量してしまうことを防ぐべく、高価な水溶液である内容物を備えた、医薬・医療用包装資材、化学品用包装資材、化粧品用包装資材、トイレタリー用包装資材として、好適である。 Further, the heat-shrinkable film of the present invention has a property that it is excellent in water vapor barrier property, so by making use of this property, it is expensive in order to prevent the contents from being reduced over time due to vaporization of water vapor. It is suitable as a pharmaceutical/medical packaging material, a chemical packaging material, a cosmetic packaging material, and a toiletry packaging material, which are provided with the contents of various aqueous solutions.
以下に本発明の内容を実施例でさらに詳しく説明するが、これらにより本発明は何ら制限を受けるものではない。なお、本明細書中に表示されるフィルムについての種々の測定値及び評価は以下のようにして行った。ここで、フィルムの押出機からの流れ方向（ＭＤ）を縦方向、その直交方向（ＴＤ）を横方向と呼ぶ。 The contents of the present invention will be described in more detail below with reference to Examples, but the present invention is not limited thereto. Various measured values and evaluations of the films shown in this specification were carried out as follows. Here, the flow direction (MD) of the film from the extruder is referred to as the longitudinal direction, and the orthogonal direction (TD) is referred to as the transverse direction.
（１）ヘイズ測定
ＪＩＳＫ７１３６に準拠して、実施例、比較例で採取した未延伸シート、及び、熱収縮性フィルムのヘイズ値を測定した。
(1) Haze measurement Based on JISK7136, the haze value of the unstretched sheet|seat sampled in the Example and the comparative example and the heat-shrinkable film was measured.
（２）２３℃引張破断強度、引張破断伸度（ＭＤ）
得られた熱収縮性フィルムをＭＤに１２０ｍｍ、ＴＤに１５ｍｍの大きさに切り出し、ＪＩＳＫ７１２７に準拠し、引張速度２００ｍｍ／ｍｉｎで、雰囲気温度２３℃におけるフィルムのＭＤの引張破断強度、引張破断伸度を測定し、１０回の測定値の平均値を測定した。
(2) 23° C. tensile strength at break, tensile elongation at break (MD)
The obtained heat-shrinkable film was cut into a size of 120 mm in MD and 15 mm in TD, and in compliance with JIS K7127, at a tensile speed of 200 mm/min, MD tensile rupture strength and tensile rupture elongation of the film at an ambient temperature of 23°C. Was measured, and the average value of 10 measurements was measured.
（３）２３℃引張破断強度、引張破断伸度（ＴＤ）
得られた熱収縮性フィルムをＴＤに１２０ｍｍ、ＭＤに１５ｍｍの大きさに切り出し、ＪＩＳＫ７１２７に準拠し、引張速度２００ｍｍ／ｍｉｎで、雰囲気温度２３℃におけるフィルムのＴＤの引張破断強度、引張破断伸度を測定し、１０回の測定値の平均値を測定した。
(3) 23° C. tensile strength at break, tensile elongation at break (TD)
The obtained heat-shrinkable film was cut into a size of 120 mm in TD and 15 mm in MD, and according to JISK7127, at a tensile speed of 200 mm/min, the TD tensile breaking strength and tensile breaking elongation of the film at an ambient temperature of 23° C. Was measured, and the average value of 10 measurements was measured.
（４）０℃引張破断強度、引張破断伸度（ＭＤ）
得られた熱収縮性フィルムをＭＤに１２０ｍｍ、ＴＤに１５ｍｍの大きさに切り出し、ＪＩＳＫ７１２７に準拠し、引張速度１００ｍｍ／ｍｉｎで雰囲気温度０℃におけるフィルムの引き取り方向（ＭＤ）の引張破断強度、引張破断伸度を測定し、１０回の測定値の平均値を測定した。
(4) 0°C tensile breaking strength, tensile breaking elongation (MD)
The obtained heat-shrinkable film was cut into a size of 120 mm in MD and 15 mm in TD, and in accordance with JISK7127, the tensile breaking strength (MD) in the take-up direction (MD) at an atmospheric temperature of 0° C. at a tensile speed of 100 mm/min The breaking elongation was measured, and the average value of 10 measurements was measured.
（５）引張弾性率
得られた熱収縮性フィルムをＪＩＳＫ７１２７に準じて、雰囲気温度２３℃におけるフィルムの引き取り方向（ＭＤ）、及び、ＴＤの引張弾性率を測定した。
(5) Tensile elastic modulus According to JISK7127, the take-up direction (MD) of the film and the TD tensile elastic modulus of the obtained heat-shrinkable film were measured at an ambient temperature of 23°C.
（６）熱収縮率
得られた熱収縮性フィルムをＭＤ１０ｍｍ、ＴＤ２００ｍｍの大きさに切り取り、５０℃、６０℃、７０℃、８０℃、９０℃、１００℃の温水バスに１０秒間それぞれ浸漬し、ＴＤの収縮量を測定した。熱収縮率は、収縮前の原寸に対する収縮量の比率を％値で表示した。また、得られた熱収縮性フィルムをＭＤ２００ｍｍ、ＴＤ１０ｍｍの大きさに切り取り、ＴＤの熱収縮率測定と同様の測定条件にて、ＭＤの熱収縮率を測定した。
(6) Heat shrinkage ratio The obtained heat shrinkable film was cut into a size of MD 10 mm and TD 200 mm, and immersed in a hot water bath of 50° C., 60° C., 70° C., 80° C., 90° C., 100° C. for 10 seconds, The amount of TD shrinkage was measured. The heat shrinkage ratio was expressed as a percentage value of the ratio of the shrinkage amount to the original size before shrinkage. Further, the obtained heat-shrinkable film was cut into a size of MD 200 mm and TD 10 mm, and the heat shrinkage rate of MD was measured under the same measurement conditions as the heat shrinkage rate measurement of TD.
（７）透湿度、フィルム厚さ４０μｍ換算透湿度
得られた熱収縮性フィルムの水蒸気バリア性を評価するため、ＪＩＳＺ０２０８（防湿包装材料の透湿度試験方法（カップ法））の諸条件に準拠し、透湿度を測定した。吸湿剤として塩化カルシウムを２０ｇ用い、温度４０℃、相対湿度９０％の恒温恒湿環境下で測定した。
また、フィルム厚さ４０μｍ換算の透湿度Ｙ（ｇ／ｍ２・ｄａｙ）は、透湿度測定に用いたフィルム厚さｄ（μｍ）を測定し、そのフィルムの透湿度がＸ（ｇ／ｍ２・ｄａｙ）であった場合、Ｙ＝Ｘ・ｄ／４０として算出した。
(7) Water vapor transmission rate, film thickness 40 μm equivalent water vapor transmission rate In order to evaluate the water vapor barrier property of the obtained heat-shrinkable film, in accordance with various conditions of JIS Z0208 (moisture transmission test method for moisture-proof packaging materials (cup method)) The water vapor permeability was measured. 20 g of calcium chloride was used as a hygroscopic agent, and measurement was performed in a constant temperature and constant humidity environment at a temperature of 40° C. and a relative humidity of 90%.
Further, the water vapor transmission rate Y (g/m 2 ·day) in terms of the film thickness of 40 μm is measured by measuring the film thickness d (μm) used for the water vapor transmission rate, and the water vapor transmission rate of the film is X (g/m 2 .Day), it was calculated as Y=X.d/40.
各実施例、比較例で使用した原材料は、下記の通りである。
＜フェノキシ樹脂（Ａ）＞
・ＧａｂｒｉｅｌＰｈｅｎｏｘｉｅｓ社製、フェノキシ樹脂、商品名：ＰＫＨＨ、Ｔｇ：９４℃、数平均分子量１３，０００、重量平均分子量５２，０００（「Ａ−１」と略する。）
＜ポリエステル系樹脂（Ｂ）＞
・ＳＫケミカル社製、共重合ポリエステル、商品名；ＳＫＹＧＲＥＥＮ ＰＥＴＧ Ｓ２００８、Ｔｇ：８２℃（「Ｂ−１」と略する。）
＜スチレン系樹脂（Ｃ）＞
・旭化成社製、スチレン−ブタジエン共重合体、スチレン含有量８２ｗｔ％、Ｔｇ：７４℃（「Ｃ−１」と略する。）
The raw materials used in each Example and Comparative Example are as follows.
<Phenoxy resin (A)>
-Phenoxy resin, trade name: PKHH, Tg: 94°C, number average molecular weight 13,000, weight average molecular weight 52,000 (abbreviated as "A-1"), manufactured by Gabriel Phenoxys.
<Polyester resin (B)>
-SK Chemical Co., Ltd., copolyester, trade name; SKYGREEN PETG S2008, Tg: 82°C (abbreviated as "B-1")
<Styrene resin (C)>
-Asahi Kasei styrene-butadiene copolymer, styrene content 82 wt%, Tg: 74 ℃ (abbreviated as "C-1".)
＜実施例１＞
表１に示す配合に基づき、「Ａ−１」２０質量％、「Ｂ−１」８０質量％を混合し、設定温度を２１０℃とした２軸押出機に導入し、溶融混練を行い、溶融樹脂をＴダイ（口金）から７７℃に設定したキャストロールで引き取り、冷却固化させて厚さ２００μｍの単層シートを得た。得られた未延伸シートのヘイズ値を表１に示す。次いで、得られた未延伸シートをフィルムテンターを用いて、１０５℃の予熱ゾーンで予熱した後、９６℃の延伸ゾーンにて、幅方向の延伸倍率５倍にて延伸し、次いで７６℃の熱処理ゾーンで熱処理を行い、熱収縮性フィルムを得た。これについて評価を行った結果を表２に示す。
<Example 1>
Based on the formulation shown in Table 1, 20% by mass of "A-1" and 80% by mass of "B-1" were mixed, introduced into a twin-screw extruder having a set temperature of 210°C, melt-kneaded, and melted. The resin was taken out from the T-die (base) with a cast roll set at 77° C. and cooled and solidified to obtain a 200 μm-thick single layer sheet. Table 1 shows the haze value of the obtained unstretched sheet. Then, the obtained unstretched sheet is preheated in a preheating zone of 105° C. using a film tenter, and then stretched in a stretching zone of 96° C. at a stretching ratio of 5 times in the width direction, and then heat treated at 76° C. Heat treatment was performed in the zone to obtain a heat-shrinkable film. The results of evaluation of this are shown in Table 2.
＜実施例２＞
表１に示す配合に基づき、「Ａ−１」４０質量％、「Ｂ−１」６０質量％を混合し、設定温度を２１０℃とした２軸押出機に導入し、溶融混練を行い、溶融樹脂をＴダイ（口金）から８２℃に設定したキャストロールで引き取り、冷却固化させて厚さ２００μｍの単層シートを得た。得られた未延伸シートのヘイズ値を表１に示す。次いで、得られた未延伸シートをフィルムテンターを用いて、１０８℃の予熱ゾーンで予熱した後、９９℃の延伸ゾーンにて、幅方向の延伸倍率５倍にて延伸し、次いで７６℃の熱処理ゾーンで熱処理を行い、熱収縮性フィルムを得た。これについて評価を行った結果を表２に示す。
<Example 2>
Based on the formulation shown in Table 1, 40% by mass of "A-1" and 60% by mass of "B-1" were mixed, introduced into a twin-screw extruder having a set temperature of 210°C, melt-kneaded, and melted. The resin was taken from a T-die (die) with a cast roll set at 82° C., and cooled and solidified to obtain a 200 μm-thick single-layer sheet. Table 1 shows the haze value of the obtained unstretched sheet. Then, the obtained unstretched sheet is preheated in a preheating zone of 108° C. using a film tenter, and then stretched in a stretching zone of 99° C. at a stretching ratio of 5 in the width direction, and then heat treated at 76° C. Heat treatment was performed in the zone to obtain a heat-shrinkable film. The results of evaluation of this are shown in Table 2.
＜比較例１＞
表１に示す配合に基づき、「Ｃ−１」１００質量％を、設定温度を２１０℃とした２軸押出機に導入し、溶融混練を行い、溶融樹脂をＴダイ（口金）から７０℃に設定したキャストロールで引き取り、冷却固化させて厚さ２００μｍの単層シートを得た。得られた未延伸シートのヘイズ値を表１に示す。次いで、得られた未延伸シートをフィルムテンターを用いて、９７℃の予熱ゾーンで予熱した後、８８℃の延伸ゾーンにて、幅方向の延伸倍率５倍にて延伸し、次いで７６℃の熱処理ゾーンで熱処理を行い、熱収縮性フィルムを得た。これについて評価を行った結果を表２に示す。
<Comparative Example 1>
Based on the formulation shown in Table 1, 100% by mass of "C-1" was introduced into a twin-screw extruder having a set temperature of 210°C, melt-kneaded, and molten resin was heated to 70°C from a T-die (die). It was taken up by the set cast roll and cooled and solidified to obtain a single-layer sheet having a thickness of 200 μm. Table 1 shows the haze value of the obtained unstretched sheet. Then, the obtained unstretched sheet is preheated in a preheating zone of 97° C. using a film tenter, and then stretched in a stretching zone of 88° C. at a stretching ratio of 5 times in the width direction, and then heat treated at 76° C. Heat treatment was performed in the zone to obtain a heat-shrinkable film. The results of evaluation of this are shown in Table 2.
＜比較例２＞
表１に示す配合に基づき、「Ａ−１」１００質量％を、設定温度を２１０℃とした２軸押出機に導入し、溶融混練を行い、溶融樹脂をＴダイ（口金）から９２℃に設定したキャストロールで引き取り、冷却固化させて厚さ２００μｍの単層シートを得た。得られた未延伸シートのヘイズ値を表１に示す。次いで、得られた未延伸シートをフィルムテンターを用いて、１１５℃の予熱ゾーンで予熱した後、１０２℃の延伸ゾーンにて、幅方向の延伸倍率５倍にて延伸したが、破断してフィルムが採取できなかった。そのため、延伸ゾーン温度を１０６℃に変更したが、延伸温度を上げても、破断してフィルムが採取できなかった。
<Comparative example 2>
Based on the formulation shown in Table 1, 100% by mass of "A-1" was introduced into a twin-screw extruder having a set temperature of 210°C, melt-kneaded, and molten resin was heated from a T-die (die) to 92°C. It was taken up by the set cast roll and cooled and solidified to obtain a single-layer sheet having a thickness of 200 μm. Table 1 shows the haze value of the obtained unstretched sheet. Then, the obtained unstretched sheet was preheated in a preheating zone of 115° C. using a film tenter, and then stretched in a stretching zone of 102° C. at a stretching ratio of 5 times in the width direction, but the film was broken. Could not be collected. Therefore, the stretching zone temperature was changed to 106° C., but even if the stretching temperature was increased, the film was broken and the film could not be collected.
＜比較例３＞
表１に示す配合に基づき、「Ａ−１」２０質量％、「Ｃ−１」８０質量％を混合し、設定温度を２１０℃とした２軸押出機に導入し、溶融混練を行い、溶融樹脂をＴダイ（口金）から８２℃に設定したキャストロールで引き取り、冷却固化させて厚さ２００μｍの単層シートを得た。しかしながら、表１に示すように、未延伸シートのヘイズ値が６０％となり、熱収縮フィルムに求められる透明性が得られなかった。そのため、延伸は行わなかった。
<Comparative example 3>
Based on the formulation shown in Table 1, 20% by mass of "A-1" and 80% by mass of "C-1" were mixed, introduced into a twin-screw extruder having a set temperature of 210°C, melt-kneaded, and melted. The resin was taken from a T-die (die) with a cast roll set at 82° C., and cooled and solidified to obtain a 200 μm-thick single-layer sheet. However, as shown in Table 1, the haze value of the unstretched sheet was 60%, and the transparency required for the heat-shrinkable film was not obtained. Therefore, stretching was not performed.
＜比較例４＞
表１に示す配合に基づき、「Ａ−１」４０質量％、「Ｃ−１」６０質量％を混合し、設定温度を２１０℃とした２軸押出機に導入し、溶融混練を行い、溶融樹脂をＴダイ（口金）から８２℃に設定したキャストロールで引き取り、冷却固化させて厚さ２００μｍの単層シートを得た。しかしながら、表１に示すように、未延伸シートのヘイズ値が７２％となり、熱収縮フィルムに求められる透明性が得られなかった。そのため、延伸は行わなかった。
<Comparative example 4>
Based on the formulation shown in Table 1, 40% by mass of "A-1" and 60% by mass of "C-1" were mixed, introduced into a twin-screw extruder having a set temperature of 210°C, melt-kneaded, and melted. The resin was taken from a T-die (die) with a cast roll set at 82° C., and cooled and solidified to obtain a 200 μm-thick single-layer sheet. However, as shown in Table 1, the haze value of the unstretched sheet was 72%, and the transparency required for the heat-shrinkable film was not obtained. Therefore, stretching was not performed.
実施例１、２で得られた本発明の熱収縮性フィルムは、高い透明性を有し、かつ、熱収縮性フィルムに求められる十分な引張破断伸度を有し、かつ、水蒸気バリア性の高い熱収縮性フィルムが得られた。
一方、比較例１で得られた熱収縮性フィルムは、透湿性が高く、水蒸気バリア性が求められる用途に用いる熱収縮性フィルムとしては、不十分であった。また、比較例２では、本発明が規定するポリエステル系樹脂（Ｂ）を含有していないため、延伸性に乏しく、熱収縮性フィルムを採取することができなかった。さらに、比較例３、４では、未延伸シートにおいて不透明であり、透明性が求められる熱収縮性フィルムとして不適であった。
The heat-shrinkable films of the present invention obtained in Examples 1 and 2 have high transparency, and have a sufficient tensile elongation at break required for the heat-shrinkable films, and have a water vapor barrier property. A highly heat-shrinkable film was obtained.
On the other hand, the heat-shrinkable film obtained in Comparative Example 1 had a high moisture permeability and was insufficient as a heat-shrinkable film used for applications requiring water vapor barrier properties. Further, in Comparative Example 2, since the polyester resin (B) defined by the present invention was not contained, the stretchability was poor and a heat-shrinkable film could not be collected. Furthermore, in Comparative Examples 3 and 4, the unstretched sheet was opaque and was not suitable as a heat-shrinkable film that required transparency.
以上、現時点において、最も実践的であり、かつ、好ましいと思われる実施形態に関連して本発明を説明したが、本発明は、本願明細書中に開示された実施形態に限定されるものではなく、請求の範囲および明細書全体から読み取れる発明の要旨、或いは思想に反しない範囲で適宜変更可能であり、そのような変更を伴う熱収縮性フィルムもまた本発明の技術的範囲に包含されるものとして理解されなければならない。 Although the present invention has been described above with reference to the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. The invention can be appropriately modified without departing from the spirit or idea of the invention that can be read from the claims and the entire specification, and a heat-shrinkable film accompanied by such modification is also included in the technical scope of the invention. Must be understood as a thing.
本発明の熱収縮性フィルムは、水蒸気バリア性、収縮性、耐破断性、耐衝撃性、剛性に優れるため、水蒸気バリア性が求められる食品用包装材料、飲料用包装材料、医薬・医療用包装材料、化学品用包装材料、化粧品用包装材料、トイレタリー用包装材料、工業用包装材料、農業資材用包装材料等に好適に利用することができ、これら用途向けの包装資材として好適に用いることができる。 The heat-shrinkable film of the present invention is excellent in water vapor barrier properties, shrinkability, puncture resistance, impact resistance, and rigidity, and therefore requires water vapor barrier properties for food packaging materials, beverage packaging materials, pharmaceutical/medical packaging. It can be suitably used as a material, a packaging material for chemicals, a packaging material for cosmetics, a packaging material for toiletries, a packaging material for industrial use, a packaging material for agricultural materials, etc., and can be suitably used as a packaging material for these applications. it can.
Claims (6)
雰囲気温度２３℃、引張速度２００ｍｍ／分の条件下で測定される主収縮方向に直交する方向の引張破断伸度が１００％以上である、熱収縮性フィルム。 A heat-shrinkable film having at least one layer containing a mixed resin composition of a phenoxy resin (A) and a polyester resin (B) as a main component,
A heat-shrinkable film having a tensile elongation at break of 100% or more in a direction orthogonal to the main shrinkage direction measured under an atmosphere temperature of 23° C. and a pulling speed of 200 mm/min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7004048B1 (en) | 2020-10-09 | 2022-02-04 | 三菱ケミカル株式会社 | Heat shrinkable films, packaging materials, articles or containers |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7004048B1 (en) | 2020-10-09 | 2022-02-04 | 三菱ケミカル株式会社 | Heat shrinkable films, packaging materials, articles or containers |
| JP2022063089A (en) * | 2020-10-09 | 2022-04-21 | 三菱ケミカル株式会社 | Heat-shrinkable film, packaging material, molding or container |
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