JP4364085B2 - Heat-shrinkable laminated film and molded article and container using the film - Google Patents
Heat-shrinkable laminated film and molded article and container using the film Download PDFInfo
- Publication number
- JP4364085B2 JP4364085B2 JP2004221841A JP2004221841A JP4364085B2 JP 4364085 B2 JP4364085 B2 JP 4364085B2 JP 2004221841 A JP2004221841 A JP 2004221841A JP 2004221841 A JP2004221841 A JP 2004221841A JP 4364085 B2 JP4364085 B2 JP 4364085B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- heat
- mass
- shrinkage
- laminated film
- 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.)
- Expired - Lifetime
Links
- 229920001225 polyester resin Polymers 0.000 claims description 41
- 239000004645 polyester resin Substances 0.000 claims description 35
- 229920001971 elastomer Polymers 0.000 claims description 21
- 150000002009 diols Chemical class 0.000 claims description 18
- 229920005990 polystyrene resin Polymers 0.000 claims description 18
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 15
- 229920005989 resin Polymers 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 15
- 150000003440 styrenes Chemical class 0.000 claims description 15
- 239000000806 elastomer Substances 0.000 claims description 14
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 12
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 229920000728 polyester Polymers 0.000 claims description 9
- 230000009257 reactivity Effects 0.000 claims description 7
- 229920001400 block copolymer Polymers 0.000 claims description 6
- 235000013305 food Nutrition 0.000 claims description 5
- 238000003475 lamination Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 229920002742 polystyrene-block-poly(ethylene/propylene) -block-polystyrene Polymers 0.000 claims 2
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 claims 2
- 239000010410 layer Substances 0.000 description 82
- 229920006257 Heat-shrinkable film Polymers 0.000 description 22
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 22
- 239000000203 mixture Substances 0.000 description 16
- 229920005644 polyethylene terephthalate glycol copolymer Polymers 0.000 description 15
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 14
- 229920000346 polystyrene-polyisoprene block-polystyrene Polymers 0.000 description 14
- 229920001577 copolymer Polymers 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 239000005001 laminate film Substances 0.000 description 10
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 10
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- 238000011156 evaluation Methods 0.000 description 9
- 239000011229 interlayer Substances 0.000 description 9
- 239000004793 Polystyrene Substances 0.000 description 8
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 8
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- 230000000052 comparative effect Effects 0.000 description 7
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- 230000007547 defect Effects 0.000 description 5
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- 239000012790 adhesive layer Substances 0.000 description 4
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
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- ROGIWVXWXZRRMZ-UHFFFAOYSA-N 2-methylbuta-1,3-diene;styrene Chemical class CC(=C)C=C.C=CC1=CC=CC=C1 ROGIWVXWXZRRMZ-UHFFFAOYSA-N 0.000 description 2
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 2
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- 230000008901 benefit Effects 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 2
- 125000002843 carboxylic acid group Chemical group 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 235000013365 dairy product Nutrition 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 150000001993 dienes Chemical class 0.000 description 2
- 239000000539 dimer Substances 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 229920006300 shrink film Polymers 0.000 description 2
- 235000014214 soft drink Nutrition 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
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- 238000012360 testing method Methods 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
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- 229940043375 1,5-pentanediol Drugs 0.000 description 1
- GYSCBCSGKXNZRH-UHFFFAOYSA-N 1-benzothiophene-2-carboxamide Chemical compound C1=CC=C2SC(C(=O)N)=CC2=C1 GYSCBCSGKXNZRH-UHFFFAOYSA-N 0.000 description 1
- KTZVZZJJVJQZHV-UHFFFAOYSA-N 1-chloro-4-ethenylbenzene Chemical compound ClC1=CC=C(C=C)C=C1 KTZVZZJJVJQZHV-UHFFFAOYSA-N 0.000 description 1
- OEVVKKAVYQFQNV-UHFFFAOYSA-N 1-ethenyl-2,4-dimethylbenzene Chemical compound CC1=CC=C(C=C)C(C)=C1 OEVVKKAVYQFQNV-UHFFFAOYSA-N 0.000 description 1
- NVZWEEGUWXZOKI-UHFFFAOYSA-N 1-ethenyl-2-methylbenzene Chemical compound CC1=CC=CC=C1C=C NVZWEEGUWXZOKI-UHFFFAOYSA-N 0.000 description 1
- JZHGRUMIRATHIU-UHFFFAOYSA-N 1-ethenyl-3-methylbenzene Chemical compound CC1=CC=CC(C=C)=C1 JZHGRUMIRATHIU-UHFFFAOYSA-N 0.000 description 1
- WHFHDVDXYKOSKI-UHFFFAOYSA-N 1-ethenyl-4-ethylbenzene Chemical compound CCC1=CC=C(C=C)C=C1 WHFHDVDXYKOSKI-UHFFFAOYSA-N 0.000 description 1
- QEDJMOONZLUIMC-UHFFFAOYSA-N 1-tert-butyl-4-ethenylbenzene Chemical compound CC(C)(C)C1=CC=C(C=C)C=C1 QEDJMOONZLUIMC-UHFFFAOYSA-N 0.000 description 1
- XNDAGYLOQWQWIM-UHFFFAOYSA-N 2,2-dimethylpropyl 3-hydroxy-2,2-dimethylpropanoate Chemical compound CC(C)(C)COC(=O)C(C)(C)CO XNDAGYLOQWQWIM-UHFFFAOYSA-N 0.000 description 1
- 150000003923 2,5-pyrrolediones Chemical class 0.000 description 1
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 1
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical group CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- DSKYSDCYIODJPC-UHFFFAOYSA-N 2-butyl-2-ethylpropane-1,3-diol Chemical compound CCCCC(CC)(CO)CO DSKYSDCYIODJPC-UHFFFAOYSA-N 0.000 description 1
- ISRGONDNXBCDBM-UHFFFAOYSA-N 2-chlorostyrene Chemical compound ClC1=CC=CC=C1C=C ISRGONDNXBCDBM-UHFFFAOYSA-N 0.000 description 1
- WDQMWEYDKDCEHT-UHFFFAOYSA-N 2-ethylhexyl 2-methylprop-2-enoate Chemical compound CCCCC(CC)COC(=O)C(C)=C WDQMWEYDKDCEHT-UHFFFAOYSA-N 0.000 description 1
- VSKJLJHPAFKHBX-UHFFFAOYSA-N 2-methylbuta-1,3-diene;styrene Chemical class CC(=C)C=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 VSKJLJHPAFKHBX-UHFFFAOYSA-N 0.000 description 1
- QWGRWMMWNDWRQN-UHFFFAOYSA-N 2-methylpropane-1,3-diol Chemical compound OCC(C)CO QWGRWMMWNDWRQN-UHFFFAOYSA-N 0.000 description 1
- 125000003504 2-oxazolinyl group Chemical group O1C(=NCC1)* 0.000 description 1
- SXFJDZNJHVPHPH-UHFFFAOYSA-N 3-methylpentane-1,5-diol Chemical compound OCCC(C)CCO SXFJDZNJHVPHPH-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 238000012371 Aseptic Filling Methods 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
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- 229910052623 talc Inorganic materials 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
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- Containers Having Bodies Formed In One Piece (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
- Wrappers (AREA)
- Laminated Bodies (AREA)
Description
本発明は、熱収縮性積層フィルム、および該フィルムを用いた成形品、容器に関し、より詳しくは、優れた収縮仕上がり性、透明性、および少ない自然収縮率を併有し、かつフィルムの層間剥離が抑制された、収縮包装、収縮結束包装や収縮ラベル等の用途に適した熱収縮性積層フィルム、および該フィルムを用いた成形品、容器に関する。 The present invention relates to a heat-shrinkable laminated film, and a molded article and container using the film, and more specifically, has excellent shrinkage finish, transparency, and a low natural shrinkage rate, and delamination of the film The present invention relates to a heat-shrinkable laminated film suitable for uses such as shrink wrapping, shrink-bound wrapping and a shrink label, and a molded product and a container using the film.
現在、ジュース等の清涼飲料水は、瓶またはペットボトルといった容器に充填された状態で販売されている。その際、他商品との差別化や商品の視認性向上のために、容器の外側に印刷が施された熱収縮性ラベルが装着されている。この熱収縮性ラベルの素材としては、通常、ポリスチレン、ポリエステル、ポリ塩化ビニル、ポリオレフィン等が用いられる。 Currently, soft drinks such as juice are sold in a state of being filled in a container such as a bottle or a plastic bottle. At that time, in order to differentiate from other products and improve the visibility of the products, a heat-shrinkable label printed on the outside of the container is attached. As a material for this heat-shrinkable label, polystyrene, polyester, polyvinyl chloride, polyolefin and the like are usually used.
ポリ塩化ビニル系(以下「PVC系」という)熱収縮性フィルムは、使用後の焼却時に塩化水素等の有害ガスを発生するという問題がある。これに対し、ポリエステル系熱収縮性フィルムは、室温での剛性が良好で、自然収縮(常温よりやや高い温度、例えば夏場においてフィルムが本来の使用前に少し収縮してしまうこと)率が小さいため、自然収縮性は非常に良好である。しかしながら、ポリエステル系熱収縮フィルムは、PVC系と比較すると加熱収縮時に収縮斑やしわが発生しやすいという問題があった。一方、スチレン−ブタジエンブロック共重合体(SBS)を主たる材料とするポリスチレン系熱収縮性フィルムも提案され使用されているが、このポリスチレン系熱収縮性フィルムは、PVC系熱収縮性フィルムと比べて、収縮仕上がり性は良好であるが、自然収縮率が大きい等の問題があった。 Polyvinyl chloride-based (hereinafter referred to as “PVC-based”) heat-shrinkable films have a problem of generating harmful gases such as hydrogen chloride during incineration after use. On the other hand, polyester-based heat-shrinkable films have good rigidity at room temperature, and have a low rate of natural shrinkage (slightly higher than normal temperature, for example, the film shrinks slightly before being used in summer). The natural shrinkage is very good. However, the polyester-based heat-shrinkable film has a problem that shrinkage spots and wrinkles are likely to occur during heat-shrinkage as compared with the PVC-based film. On the other hand, polystyrene-based heat-shrinkable films mainly composed of styrene-butadiene block copolymer (SBS) have also been proposed and used. However, this polystyrene-based heat-shrinkable film is compared with PVC-based heat-shrinkable films. The shrinkage finish is good, but there are problems such as a large natural shrinkage rate.
近年、益々需要の増大が見込まれているペットボトルのラベル用途等では、比較的短時間かつ比較的低温において高度な収縮仕上がり外観が得られること、および小さな自然収縮率を有する熱収縮性フィルムが要求されている。その理由としては、最近のペットボトルおよびビンに装着されるシュリンクフィルムのラベリング工程における低温化のニーズが挙げられる。すなわち、現在、蒸気シュリンカーを用いて熱収縮フィルムをシュリンクさせてラベリングする方法が主流となっているが、無菌充填や内容物の温度上昇による品質低下を回避するためには、シュリンク工程はできるだけ低温で行うことが望ましい。このような理由から、現在のシュリンクフィルム業界では、ラベリング時に蒸気シュリンカー内でできるだけ低温で収縮を開始し、かつ蒸気シュリンカー通過後に優れた収縮仕上がり特性が得られる熱収縮性フィルムの開発が行われている。 In recent years, for labeling of PET bottles, for which demand is expected to increase, a highly shrink-finished appearance can be obtained in a relatively short time and at a relatively low temperature, and a heat-shrinkable film having a small natural shrinkage rate can be obtained. It is requested. The reason for this is the need for low temperatures in the labeling process of shrink films to be installed in recent PET bottles and bottles. That is, at present, the method of shrinking and labeling the heat-shrinkable film using steam shrinker has become the mainstream, but in order to avoid aseptic filling and quality deterioration due to temperature rise of the contents, the shrinking process can be performed as much as possible. It is desirable to carry out at a low temperature. For this reason, the current shrink film industry is developing heat-shrinkable films that start shrinking at the lowest possible temperature in the steam shrinker during labeling and that have excellent shrink finish characteristics after passing through the steam shrinker. It has been broken.
上記の用途に対しては、主に低温収縮性を兼ね備えつつ、自然収縮が抑えられているポリエステル系熱収縮性フィルムが使用されている。しかし、ポリエステル系熱収縮性フィルムでは低温収縮性は良好なものの、収縮仕上がり性に問題があったため、収縮仕上がり性に優れたスチレン系熱収縮性フィルムの開発が望まれていた。 For the above applications, a polyester heat-shrinkable film that has low-temperature shrinkage and has reduced natural shrinkage is used. However, although the polyester-based heat-shrinkable film has good shrinkage at low temperatures, there is a problem in shrink-finishing property. Therefore, development of a styrene-based heat-shrinkable film having excellent shrinkage-finishing property has been desired.
上記課題を解決する手段として、例えば包装材料用途フィルムとして、ポリスチレン系樹脂からなる中間層に、接着層を介してポリエステル系樹脂からなる外面層が積層された積層フィルムが報告されている(特許文献1参照)。しかしながら、この積層フィルムには、フィルムの収縮時に接着層が他層に追従できす層間剥離に代表される外観不良が発現してしまうという問題があった。 As a means for solving the above problems, for example, as a packaging material application film, a laminated film in which an outer layer made of a polyester resin is laminated on an intermediate layer made of a polystyrene resin via an adhesive layer has been reported (Patent Document) 1). However, this laminated film has a problem in that an appearance defect typified by delamination that allows the adhesive layer to follow other layers when the film shrinks occurs.
また、ポリスチレン系樹脂からなる中間層の両側に、ジオール成分として1,4ーシクロヘキサンジメタノールを含有するポリエステル系樹脂ポリエステル系樹脂からなる表裏層が積層されてなるベースフィルムを備えたシュリンクラベルが報告されている(特許文献2参照)。しかしながら、このシュリンクラベルは、層間密着が不十分であり、二次加工の印刷時に層間剥離が生じやすいという問題があった。 Also reported is a shrink label with a base film in which both sides of an intermediate layer made of polystyrene resin are laminated with polyester resin and polyester resin containing 1,4-cyclohexanedimethanol as a diol component. (See Patent Document 2). However, this shrink label has a problem in that interlayer adhesion is insufficient, and delamination is likely to occur during printing in secondary processing.
また、スチレン系樹脂とポリエステル系樹脂との複合樹脂からなる中間層の両側に、ジオール成分として1,4ーシクロヘキサンジメタノールを含有するポリエステル系樹脂ポリエステル系樹脂からなる表裏層が積層されてなるベースフィルムを備えたシュリンクラベルが報告されている(特許文献3参照)。しかしながら、このシュリンクラベルであっても表裏層と中間層の間の層間密着は満足のいくものではなく、二次加工の印刷時に層間剥離が起こるという問題があった。 Also, a base layer in which front and back layers made of a polyester resin containing a polyester resin containing 1,4-cyclohexanedimethanol as a diol component are laminated on both sides of an intermediate layer made of a composite resin of a styrene resin and a polyester resin. A shrink label provided with a film has been reported (see Patent Document 3). However, even with this shrink label, the interlayer adhesion between the front and back layers and the intermediate layer is not satisfactory, and there has been a problem that delamination occurs during printing in the secondary processing.
また、層間接着を改良した技術として、内層にビニル芳香族炭化水素と共役ジエン誘導体とのブロック共重合体、両外層に共重合ポリエステル系、接着層にエチレン−酢酸ビニル共重合体、エチレン−不飽和カルボン酸共重合体などを用いたフィルムが報告されている(特許文献4参照)。しかし、このフィルムは、内層のビニル芳香族炭化水素と共役ジエン誘導体と接着層のエチレン−酢酸ビニル共重合体との相溶性が劣るため、フィルムの耳などのトリミングロス等から発生するリサイクル樹脂を添加(以下、「再生添加」と称する)した際に、フィルム全体の透明性が低下しやすいといった問題点があった。
本発明は、上記課題に鑑みてなされたものであり、本発明の目的は、収縮仕上がり性、透明性に優れ、かつ自然収縮率が小さいフィルムであって、層間剥離が抑制された、収縮包装、収縮結束包装や収縮ラベル等の用途に適した熱収縮性積層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-mentioned problems, and an object of the present invention is a film having excellent shrinkage finish properties, transparency, and a small natural shrinkage rate, in which delamination is suppressed. An object of the present invention is to provide a heat-shrinkable laminated film suitable for applications such as shrink-bound packaging and shrink labels.
本発明のもう一つの目的は、収縮包装、収縮結束包装や収縮ラベル等の用途に適した前記フィルムを用いた成形品および容器を提供することにある。 Another object of the present invention is to provide a molded product and a container using the film suitable for applications such as shrink wrap, shrink bundle wrap and shrink labels.
本発明者は、積層フィルムを形成する中間層と両外層の各組成を鋭意検討した結果、上記従来技術の課題を解決し得る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。
すなわち、本発明の目的は、以下の熱収縮性積層フィルムにより達成される。
(1) ポリエステル系樹脂と該ポリエステル系樹脂100質量部に対して反応性を有する変性スチレン系エラストマー1〜20質量部とを含有する表裏層と、ポリスチレン系樹脂と該ポリスチレン系樹脂100質量部に対してポリエステル系樹脂1〜30質量部とを含有する中間層とからなることを特徴とする熱収縮性積層フィルム。
(2) 70℃温水中で10秒間加熱したときのフィルム主収縮方向の熱収縮率が5〜25%であり、かつ80℃温水中で10秒間加熱したときのフィルム主収縮方向の熱収縮率が30〜60%である(1)に記載の熱収縮性積層フィルム。
(3) 30℃で30日間保存した後のフィルム主収縮方向の自然収縮率が3.0%以下である(1)または(2)に記載の熱収縮性多層フィルム。
(4) 前記ポリエステル系樹脂が、ジカルボン酸成分およびジオール成分からなり、前記ジカルボン酸成分および前記ジオール成分の少なくとも一方が2種以上の成分で構成され、前記2種以上の成分のうち最多成分を除いた成分の合計の含有率が前記ジカルボン酸成分の総量(100モル%)と前記ジオール成分の総量(100モル%)との合計(200モル%)に対して10〜50モル%である(1)〜(3)のいずれかに記載の熱収縮性積層フィルム。
(5) 前記反応性を有する変性スチレン系エラストマーが、無水マレイン酸変性SEBS、無水マレイン酸変性SEPS、エポキシ変性SEBS、およびエポキシ変性SEPSからなる群から選ばれる少なくとも1種である(1)〜(4)のいずれかに記載の熱収縮性積層フィルム。
(6) 前記ポリスチレン系樹脂が、スチレン−ブタジエンブロック共重合体であり、該ブロック共重合体を構成するブタジエンの含有率が5〜40モル%である請求項1〜5のいずれか一項に記載の熱収縮性積層フィルム。
(7) 前記表裏層と前記中間層との積層比が1/1/1〜1/10/1である(1)〜(6)のいずれかに記載の熱収縮性積層フィルム。
As a result of intensive studies on the compositions of the intermediate layer and both outer layers forming the laminated film, the present inventor succeeded in obtaining a film that can solve the above-mentioned problems of the prior art, and completed the present invention.
That is, the object of the present invention is achieved by the following heat-shrinkable laminated film.
(1) Front and back layers containing a polyester resin and 1 to 20 parts by mass of a modified styrene elastomer having reactivity with 100 parts by mass of the polyester resin, a polystyrene resin and 100 parts by mass of the polystyrene resin A heat-shrinkable laminated film comprising an intermediate layer containing 1 to 30 parts by mass of a polyester-based resin.
(2) The heat shrinkage rate in the main film shrinkage direction when heated in 70 ° C warm water for 10 seconds is 5 to 25%, and the heat shrinkage rate in the film main shrinkage direction when heated in 80 ° C warm water for 10 seconds. The heat-shrinkable laminated film according to (1), having a content of 30 to 60%.
(3) The heat-shrinkable multilayer film according to (1) or (2), wherein the natural shrinkage in the main film shrinkage direction after storage at 30 ° C. for 30 days is 3.0% or less.
(4) The polyester-based resin is composed of a dicarboxylic acid component and a diol component, and at least one of the dicarboxylic acid component and the diol component is composed of two or more components, and the most numerous component among the two or more components. The total content of the removed components is 10 to 50 mol% with respect to the total (200 mol%) of the total amount (100 mol%) of the dicarboxylic acid component and the total amount (100 mol%) of the diol component ( The heat-shrinkable laminated film according to any one of 1) to (3).
(5) The modified styrene elastomer having the reactivity is at least one selected from the group consisting of maleic anhydride-modified SEBS, maleic anhydride-modified SEPS, epoxy-modified SEBS, and epoxy-modified SEPS (1) to ( The heat-shrinkable laminated film according to any one of 4).
(6) The polystyrene resin is a styrene-butadiene block copolymer, and the content of butadiene constituting the block copolymer is 5 to 40 mol%. The heat-shrinkable laminated film as described.
(7) The heat-shrinkable laminated film according to any one of (1) to (6), wherein a lamination ratio of the front and back layers and the intermediate layer is 1/1/1 to 1/10/1.
本発明のもう一つの目的は、以下の成形品および容器により達成される。
(8) (1)〜(7)のいずれかに記載の熱収縮性積層フィルムを用いて得られることを特徴とする成形品。
(9) 前記成型品が食品容器用ラベルである(8)に記載の成形品。
(10)(8)または(9)に記載の成形品を装着した容器。
Another object of the present invention is achieved by the following molded article and container.
(8) A molded product obtained by using the heat-shrinkable laminated film according to any one of (1) to (7).
(9) The molded product according to (8), wherein the molded product is a food container label.
(10) A container equipped with the molded product according to (8) or (9).
本発明によれば、収縮仕上がり性、透明性、自然収縮に優れ、かつフィルム内の層間剥離が抑制された、ペットボトルのラベル用途などに好適な熱収縮性積層フィルムを提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the heat-shrinkable laminated film suitable for the label use of a PET bottle etc. which was excellent in shrink finishing property, transparency, and natural shrinkage | contraction, and the delamination in the film was suppressed can be provided.
さらに、本発明によれば、収縮仕上がり性、透明性、自然収縮に優れた成形品および成形品を装備した容器を提供できる。 Furthermore, according to the present invention, it is possible to provide a molded article excellent in shrink finish, transparency, and natural shrinkage, and a container equipped with the molded article.
以下、発明の熱収縮性積層フィルム、成形品および容器を詳細に説明する。
なお、本発明における数値範囲の上限値および下限値は、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である。
Hereinafter, the heat-shrinkable laminated film, molded product and container of the invention will be described in detail.
It should be noted that the upper and lower limits of the numerical range in the present invention are those of the present invention as long as they have the same operational effects as those in the numerical range even if they are slightly outside the numerical range specified by the present invention. It is included in the equivalent range.
[熱収縮性積層フィルム]
本発明のフィルムは、ポリエステル系樹脂および反応性を有する変性スチレン系エラストマーを含有する表裏層と、ポリスチレン系樹脂およびポリエステル系樹脂を含有する中間層とを有する。
[Heat-shrinkable laminated film]
The film of the present invention has front and back layers containing a polyester resin and a modified styrene elastomer having reactivity, and an intermediate layer containing a polystyrene resin and a polyester resin.
<表裏層>
本発明のフィルムにおいて、表裏層はポリエステル系樹脂と反応性を有する変性スチレン系エラストマーとを含有する。
表裏層で用いられるポリエステル系樹脂は、ジカルボン酸成分およびジオール成分からなる。ジカルボン酸成分としてテレフタル酸、ジオール成分としてエチレングリコールを主成分とするエチレンテレフタレート系共重合ポリエステルが好適に用いられる。
<Front and back layers>
In the film of the present invention, the front and back layers contain a polyester resin and a modified styrene elastomer having reactivity.
The polyester resin used in the front and back layers is composed of a dicarboxylic acid component and a diol component. An ethylene terephthalate copolymer polyester mainly composed of terephthalic acid as the dicarboxylic acid component and ethylene glycol as the diol component is preferably used.
ポリエステル系樹脂を構成する主なジカルボン酸成分は、上述のとおりテレフタル酸であり、ジカルボン酸成分100モル%に対してテレフタル酸を40モル%以上、好ましくは45モル%以上、さらに好ましくは50モル%以上を含有する。また、テレフタル酸以外のジカルボン酸成分として、例えば、イソフタル酸、アジピン酸、セバシン酸、オルソフタル酸、ナフタレンジカルボン酸、コハク酸、アジピン酸、アゼライン酸、デカン酸、ダイマー酸、シクロヘキサンジカルボン酸、トリメリット酸などを含有することができ、中でもイソフタル酸を好適に含有することができる。 The main dicarboxylic acid component constituting the polyester resin is terephthalic acid as described above, and terephthalic acid is 40 mol% or more, preferably 45 mol% or more, more preferably 50 mol, relative to 100 mol% of the dicarboxylic acid component. % Or more. Examples of dicarboxylic acid components other than terephthalic acid include, for example, isophthalic acid, adipic acid, sebacic acid, orthophthalic acid, naphthalenedicarboxylic acid, succinic acid, adipic acid, azelaic acid, decanoic acid, dimer acid, cyclohexanedicarboxylic acid, trimellit An acid etc. can be contained and isophthalic acid can be contained suitably especially.
ポリエステル系樹脂を構成する主なジオール成分は、上述のとおりエチレングリコールであり、ジオール成分100モル%に対してエチレングリコールを40モル%以上、好ましくは45モル%以上、さらに好ましくは50モル%以上含有する。また、エチレングリコール以外のジオール成分として、例えば、ネオペンチルグリコール、ジエチレングリコール、1,4−シクロヘキサンジメタノール、1,4−ブタンジオール、1,2−ブタンジオール、1,3−ブタンジオール、1,5−ペンタンジオール、3−メチル−1,5−ペンタンジオール、2−メチル−1,3−プロパンジオール、ヘキサンジオール、ノナンジオール、ダイマージオール、ビスフェノールAのエチレンオキサイド付加物やプロピレンオキサイド付加物、ポリエチレングリコール、ポリプロピレングリコール、ポリテトラメチレングリコール、2−ブチル−2−エチル−1,3−プロパンジオール、トリシクロデカンジメタノール、ネオペンチルヒドロキシピバリン酸エステル、2,2,4−トリメチル−1,5−ペンタンジオール、トリメチロールプロパン等を含有することができ、中でも1,4−シクロヘキサジメタノールを好適に含有することができる。また、1,4−シクロヘキサンジメタノールには、シス型とトランス型の2種類の異性体が存在するが、いずれであってもよい。 The main diol component constituting the polyester-based resin is ethylene glycol as described above, and ethylene glycol is 40 mol% or more, preferably 45 mol% or more, more preferably 50 mol% or more with respect to 100 mol% of the diol component. contains. Examples of diol components other than ethylene glycol include neopentyl glycol, diethylene glycol, 1,4-cyclohexanedimethanol, 1,4-butanediol, 1,2-butanediol, 1,3-butanediol, 1,5 -Pentanediol, 3-methyl-1,5-pentanediol, 2-methyl-1,3-propanediol, hexanediol, nonanediol, dimer diol, ethylene oxide adduct or propylene oxide adduct of bisphenol A, polyethylene glycol , Polypropylene glycol, polytetramethylene glycol, 2-butyl-2-ethyl-1,3-propanediol, tricyclodecane dimethanol, neopentyl hydroxypivalate, 2,2,4-trimethyl-1 5-pentanediol, can contain trimethylolpropane can be preferably containing inter alia 1,4-cyclohexadienyl methanol. In addition, 1,4-cyclohexanedimethanol has two isomers, a cis type and a trans type, which may be either.
表裏層で用いられるポリエステル系樹脂は、ジカルボン酸成分とジオール成分の少なくとも一方が2種以上の成分で構成されていることが好ましい。本明細書では、これらの2種以上の成分において、主成分、すなわち質量(モル%)が最多のものを第1成分とし、該第1成分よりも少ない成分を第2成分以下の成分(第2成分、第3成分・・・)とする。ジカルボン酸成分とジオール成分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、表裏層として用いた場合、表裏層の結晶化の進行を抑えることができる。 It is preferable that at least one of the dicarboxylic acid component and the diol component is composed of two or more components in the polyester resin used in the front and back layers. In the present specification, among these two or more components, the main component, that is, the one having the largest mass (mol%) is defined as the first component, and the component smaller than the first component is the component equal to or less than the second component (first component). 2 component, 3rd component ...). By making such a mixture of the dicarboxylic acid component and the diol component, the crystallinity of the resulting polyester-based resin can be lowered. Therefore, when used as the front and back layers, the progress of crystallization of the front and back layers can be suppressed. .
上記2種以上の成分のうち、第1成分を除いた第2成分以下の成分の合計は、ジカルボン酸成分の総量(100モル%)と前記ジオール成分の総量(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20モル%以上であることが望ましい。第2成分以下の成分の合計が10モル%以上であれば、製膜する際の結晶化を抑制でき、再度フィルムを加熱することにより十分な熱収縮特性が得られ、さらにフィルムを背貼りする際の溶剤シール性にも優れる。また、結晶化が抑制できるため、該フィルムのリターンを中間層に行う際、押出温度をポリエステル系樹脂の融点より低くできるため、後述する中間層のスチレン系樹脂に適した押出温度で混練することが可能であり好ましい。一方、第2成分以下の成分の上限は50モル%、好ましくは45モル%、さらにこのましくは40モル%とすることが望ましい。第2成分以下の成分の合計が50モル%以下であれば、共重合成分の第1成分の長所を活かすことができる。 Among the two or more components, the sum of the components below the second component excluding the first component is the sum of the total amount of dicarboxylic acid components (100 mol%) and the total amount of the diol components (100 mol%) ( 200 mol%) is preferably 10 mol% or more, preferably 15 mol% or more, more preferably 20 mol% or more. If the total of the components below the second component is 10 mol% or more, crystallization during film formation can be suppressed, and sufficient heat shrinkage characteristics can be obtained by heating the film again, and the film is further attached to the back. Excellent solvent sealing performance. In addition, since the crystallization can be suppressed, when the film is returned to the intermediate layer, the extrusion temperature can be lower than the melting point of the polyester resin. Therefore, the film is kneaded at an extrusion temperature suitable for the intermediate layer styrene resin described later. Is possible and preferred. On the other hand, the upper limit of the components below the second component is 50 mol%, preferably 45 mol%, more preferably 40 mol%. If the total of the components below the second component is 50 mol% or less, the advantages of the first component of the copolymer component can be utilized.
表裏層で用いられるポリエステル系樹脂の質量平均分子量は、30,000以上、好ましくは35,000以上、さらに好ましくは40,000であることが望ましい。また、前記ポリエステル系樹脂の質量平均分子量の上限値は、80,000、好ましくは75,000、さらに好ましくは70,000とすることが望ましい。質量平均分子量が30,000以上であれば、樹脂凝集力不足のためにフィルムの強伸度が不足し、脆くなることを抑えることができる。一方、質量平均分子量が80,000以下であれば、溶融粘度が下がるために、製造、生産性的に好ましい。 The mass average molecular weight of the polyester resin used in the front and back layers is 30,000 or more, preferably 35,000 or more, and more preferably 40,000. The upper limit of the mass average molecular weight of the polyester resin is 80,000, preferably 75,000, and more preferably 70,000. When the mass average molecular weight is 30,000 or more, it is possible to suppress brittleness due to insufficient strength of the film due to insufficient resin cohesion. On the other hand, a mass average molecular weight of 80,000 or less is preferable in terms of production and productivity because the melt viscosity is lowered.
表裏層で用いられるポリエステル系樹脂の極限粘度(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以上である。また、前記ポリエステル系樹脂の極限粘度(IV)の上限値は1.5dl/g、好ましくは1.2dl/g、さらに好ましくは1.0dl/gであることが望ましい。極限粘度(IV)が0.5dl/g以上であれば、フィルム強度特性が低下することを抑えられる。一方、極限粘度(IV)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止できる。 The intrinsic viscosity (IV) of the polyester resin used in the front and back layers is 0.5 dl / g or more, preferably 0.6 dl / g or more, more preferably 0.7 dl / g or more. The upper limit of the intrinsic viscosity (IV) of the polyester resin is 1.5 dl / g, preferably 1.2 dl / g, more preferably 1.0 dl / g. If intrinsic viscosity (IV) is 0.5 dl / g or more, it can suppress that a film strength characteristic falls. On the other hand, if the intrinsic viscosity (IV) is 1.5 dl / g or less, breakage and the like accompanying an increase in stretching tension can be prevented.
上記ポリエステル系樹脂の市販品としては、例えば、「PETG6763」(イーストマンケミカル社製)、「SKYREEN PETG」(SKケミカル社製)などが挙げられる。 As a commercial item of the said polyester-type resin, "PETG6763" (made by Eastman Chemical), "SKYREEN PETG" (made by SK Chemical), etc. are mentioned, for example.
本発明のフィルムの表裏層は、反応性を有する変性スチレン系エラストマーを含有する。表裏層に変性スチレン系エラストマーを含有させることにより、表裏層と中間層の層間接着力を向上させることができ、収縮、製袋加工、販売時に層間剥離に代表される外観不良の発現を抑制することができる。 The front and back layers of the film of the present invention contain a modified styrenic elastomer having reactivity. By including a modified styrene-based elastomer in the front and back layers, the interlayer adhesion between the front and back layers and the intermediate layer can be improved, and the appearance defects such as delamination during shrinkage, bag making, and sales are suppressed. be able to.
表裏層で用いられる変性スチレン系エラストマーとしては、ポリエステル系樹脂と反応可能な極性基を有し、かつスチレン系樹脂との相溶部を有するブロック共重合体またはグラフト共重合体が挙げられる。ここで、ポリエステル系樹脂と反応可能な極性基とは、ポリエステル系樹脂が有する極性基と反応し得る官能基を指し、具体的には酸無水物基、カルボン酸基、カルボン酸エステル基、カルボン酸塩化物基、カルボン酸アミド基、カルボン酸塩基、スルホン酸基、スルホン酸エステル基、スルホン酸塩化物基、スルホン酸アミド基、スルホン酸塩基、エポキシ基、アミノ基、イミド基、オキサゾリン基などが挙げられる。また、スチレン系樹脂との相溶部を有するものとは、シンジオタクチックポリスチレン(SPS)または変性SPSと親和性のある連鎖を有するものを指し、具体的にはスチレン鎖、スチレン系共重合体セグメントなどを主鎖、ブロックまたはグラフト鎖として有するものや、スチレン系モノマー単位を含有するランダム共重合体などが挙げられる。 Examples of the modified styrene elastomer used in the front and back layers include a block copolymer or graft copolymer having a polar group capable of reacting with a polyester resin and having a compatible part with the styrene resin. Here, the polar group capable of reacting with the polyester-based resin refers to a functional group capable of reacting with the polar group of the polyester-based resin, and specifically includes an acid anhydride group, a carboxylic acid group, a carboxylic acid ester group, a carboxyl group. Acid chloride group, carboxylic acid amide group, carboxylic acid group, sulfonic acid group, sulfonic acid ester group, sulfonic acid chloride group, sulfonic acid amide group, sulfonic acid group, epoxy group, amino group, imide group, oxazoline group, etc. Is mentioned. Moreover, what has a compatible part with a styrene-type resin refers to what has a chain | strand with affinity with syndiotactic polystyrene (SPS) or modified | denatured SPS, and specifically, a styrene chain, a styrene-type copolymer. Examples thereof include those having a segment as a main chain, block or graft chain, and random copolymers containing styrene monomer units.
変性スチレン系エラストマーとしては、例えば、スチレン−ブチルアクリレート共重合体ゴム、スチレン−ブタジエンブロック共重合体(SBR)、水素添加スチレン−ブタジエンブロック共重合体(SEB)、スチレン−ブタジエン−スチレンブロック共重合体(SBS)、水素添加スチレン−ブタジエン−スチレンブロック共重合体(SEBS)、スチレン−イソプレンブロック共重合体(SIR)、水素添加スチレン−イソプレンブロック共重合体(SEP)、スチレン−イソプレン−スチレンブロック共重合体(SIS)、水素添加スチレン−イソプレン−スチレンブロック共重合体(SEPS)、スチレン−ブタジエンランダム共重合体、水素添加スチレン−ブタジエンランダム共重合体、スチレン−エチレン−プロピレンランダム共重合体、スチレン−エチレン−ブチレンランダム共重合体などを、極性基を有する変性剤により変性したゴムなどが挙げられる。これらの中でも特にSEB、SEBS、SEP、SEPSの変性体を好適に用いることができ、より具体的には、無水マレイン酸変性SEBS、無水マレイン酸変性SEPS、エポキシ変性SEBS、エポキシ変性SEPSなどが挙げられる。
上記の変性スチレン系エラストマーは、単独で用いてもよいし、二種以上を組み合わせて用いてもよい。
Examples of modified styrene elastomers include styrene-butyl acrylate copolymer rubber, styrene-butadiene block copolymer (SBR), hydrogenated styrene-butadiene block copolymer (SEB), and styrene-butadiene-styrene block copolymer. Copolymer (SBS), hydrogenated styrene-butadiene-styrene block copolymer (SEBS), styrene-isoprene block copolymer (SIR), hydrogenated styrene-isoprene block copolymer (SEP), styrene-isoprene-styrene block Copolymer (SIS), hydrogenated styrene-isoprene-styrene block copolymer (SEPS), styrene-butadiene random copolymer, hydrogenated styrene-butadiene random copolymer, styrene-ethylene-propylene lander Copolymer, styrene - ethylene - butylene random copolymer and the like, such as modified rubbers by denaturing agent having a polar group. Among these, modified SEB, SEBS, SEP, and SEPS can be preferably used. More specifically, maleic anhydride-modified SEBS, maleic anhydride-modified SEPS, epoxy-modified SEBS, and epoxy-modified SEPS are listed. It is done.
Said modified styrene-type elastomer may be used independently and may be used in combination of 2 or more type.
上記変性スチレン系エラストマーは、上記表裏層で用いられるポリエステル系樹脂100質量部に対して1〜20質量部、好ましくは3〜18質量部、さらに好ましくは5〜15質量部の範囲で含有させることができる。変性スチレン系エラストマーを1質量部以上含有させた場合、表裏層と中間層の層間接着強度の改善が期待でき、一方、20質量部以下で含有させることにより、フィルムの透明性を維持できるほか、延伸特性、フィルムの腰の強さを維持できる。 The modified styrenic elastomer is contained in an amount of 1 to 20 parts by weight, preferably 3 to 18 parts by weight, and more preferably 5 to 15 parts by weight with respect to 100 parts by weight of the polyester resin used in the front and back layers. Can do. When the modified styrene-based elastomer is contained in an amount of 1 part by mass or more, an improvement in the interlayer adhesion strength between the front and back layers and the intermediate layer can be expected. On the other hand, by containing it in an amount of 20 parts by mass or less, the transparency of the film can be maintained. Stretching properties and film stiffness can be maintained.
<中間層>
本発明のフィルムにおいて、中間層はポリスチレン系樹脂とポリエステル系樹脂とを含有する。
中間層で用いられるポリスチレン系樹脂は、スチレン系モノマーの重合体、スチレン系モノマーとそれらと共重合可能な他のモノマーとの共重合体を挙げることができる。
スチレン系モノマーとしては、例えば、スチレン、2−メチルスチレン、3−メチルスチレン、4−メチルスチレン、4−エチルスチレン、4−t−ブチルスチレン、2,4−ジメチルスチレン等のアルキル置換スチレン、α−メチルスチレン、α−メチル−4−メチルスチレン等のα−アルキル置換スチレン、2−クロロスチレン、4−クロロスチレン等のハロゲン化スチレン等から選ばれる1種以上が挙げられる。
<Intermediate layer>
In the film of the present invention, the intermediate layer contains a polystyrene resin and a polyester resin.
Examples of the polystyrene resin used in the intermediate layer include a polymer of a styrene monomer and a copolymer of a styrene monomer and another monomer copolymerizable therewith.
Examples of the styrene monomer include alkyl-substituted styrene such as styrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 4-ethylstyrene, 4-t-butylstyrene, and 2,4-dimethylstyrene, α -1 type or more chosen from alpha-alkyl substituted styrene, such as methyl styrene and (alpha) -methyl 4-methyl styrene, halogenated styrene, such as 2-chloro styrene and 4-chloro styrene, etc. are mentioned.
スチレン系モノマーと共重合可能な他のモノマーとしては、アクリル酸またはメタクリル酸、アクリル酸メチルまたはメタクリル酸メチル、アクリル酸エチルまたはメタクリル酸エチル、アクリル酸ブチルまたはメタクリル酸ブチル、アクリル酸2−エチルヘキシルまたはメタクリル酸2−エチルヘキシル等のアクリル酸(C1〜C8)エステルまたはメタクリル酸(C1〜C8)エステル、アクリロニトリル、無水マレイン酸、マレイミド、N−メチルマレイミド、N−エチルマレイミドのようなN−置換マレイミド等のマレイン酸およびその誘導体等から選ばれる1種以上が挙げられる。中でもアクリル酸ブチルを用いることが好ましい。 Other monomers copolymerizable with styrenic monomers include acrylic acid or methacrylic acid, methyl acrylate or methyl methacrylate, ethyl acrylate or ethyl methacrylate, butyl acrylate or butyl methacrylate, 2-ethylhexyl acrylate or N such as acrylic acid (C 1 -C 8 ) ester such as 2-ethylhexyl methacrylate or methacrylic acid (C 1 -C 8 ) ester, acrylonitrile, maleic anhydride, maleimide, N-methylmaleimide, N-ethylmaleimide -One or more types selected from maleic acid such as substituted maleimide and derivatives thereof. Of these, butyl acrylate is preferably used.
また、上記ポリスチレン系樹脂は、ゴム変性スチレン系樹脂とすることも好ましい。ゴム変性にすることにより、収縮特性が緩やかになるため、ボトル装着時の仕上がりが良好になるほか、フィルムの耐衝撃性も向上する。ゴム変性スチレン系樹脂の製造において用いるゴムとしては、例えば、ブタジエンゴム、ブタジエン−イソプレンゴム、ブタジエン−アクリロニトリルゴム、エチレン−プロピレンゴム、イソプレンゴム、アクリルゴム、エチレン−酢酸ビニルゴム等の非スチレン系ゴム、スチレン−ブタジエンゴム、スチレン−イソプレンゴム等のスチレン系ゴムから選ばれる1種以上が挙げられる。
なお、ブタジエンゴムは、シス−1,4構造の含有率の高いものであっても、シス−1,4構造の含有率の低いものであってもよい。
The polystyrene resin is preferably a rubber-modified styrene resin. By making the rubber modified, the shrinkage characteristics become gentle, so that the finish when the bottle is mounted is improved and the impact resistance of the film is improved. Examples of the rubber used in the production of the rubber-modified styrene resin include butadiene rubber, butadiene-isoprene rubber, butadiene-acrylonitrile rubber, ethylene-propylene rubber, isoprene rubber, acrylic rubber, ethylene-vinyl acetate rubber, and other non-styrene rubbers, Examples thereof include one or more selected from styrene-based rubbers such as styrene-butadiene rubber and styrene-isoprene rubber.
The butadiene rubber may have a high content of cis-1,4 structure or a low content of cis-1,4 structure.
上記ポリスチレン系樹脂は、耐衝撃性の観点からスチレンとブタジエンとの共重合体であることが好ましい。ポリスチレン系樹脂中におけるブタジエンの含有量は5質量%以上、好ましくは10質量%以上、さらに好ましくは15質量%以上とすることができる。また前記ブタジエンの含有量の上限値は、40質量%、好ましくは35質量%、さらに好ましくは、30質量%とすることができる。ブタジエンの含有量が5質量%以上であれば、耐衝撃性の効果が発揮でき、また、上限を40質量%とすることにより、室温近辺でのフィルムの弾性率が保持され、良好な腰の強さが得られる。ポリスチレン系樹脂をスチレン−ブタジエン共重合体にする場合の重合形態は特に限定されるものではなく、ブロック共重合体、ランダム共重合体、およびはテーパーブロック構造を有する共重合体のいずれの態様であってもよいが、ブロック共重合体であることが好ましい。
上記ポリスチレン系樹脂は単独で用いてもよいし、二種以上を組み合わせて用いてもよい。
The polystyrene resin is preferably a copolymer of styrene and butadiene from the viewpoint of impact resistance. The content of butadiene in the polystyrene-based resin can be 5% by mass or more, preferably 10% by mass or more, and more preferably 15% by mass or more. The upper limit of the butadiene content is 40% by mass, preferably 35% by mass, and more preferably 30% by mass. If the content of butadiene is 5% by mass or more, the effect of impact resistance can be exhibited, and by setting the upper limit to 40% by mass, the elastic modulus of the film near room temperature is maintained, and a good waist Strength is obtained. The polymerization form when the polystyrene resin is made into a styrene-butadiene copolymer is not particularly limited, and in any embodiment of a block copolymer, a random copolymer, and a copolymer having a tapered block structure. Although it may be, it is preferably a block copolymer.
The above polystyrene resins may be used alone or in combination of two or more.
上記ポリスチレン系樹脂の分子量は、質量平均分子量(Mw)で100,000以上、好ましくは150,000以上とすることができる。また、前記質量平均分子量(Mw)の上限値は、500,000、好ましくは400,000、さらに好ましくは300,000とすることができる。ポリスチレン系樹脂の分子量が100,000以上であれば、フィルムの劣化が生じるような欠点もなく好ましい。さらに、ポリスチレン系樹脂の分子量が500,000以下であれば、流動特性を調整する必要なく、押出性が低下するなどの欠点もないため好ましい。 The molecular weight of the polystyrene-based resin can be 100,000 or more, preferably 150,000 or more in terms of mass average molecular weight (Mw). The upper limit of the mass average molecular weight (Mw) can be 500,000, preferably 400,000, and more preferably 300,000. If the molecular weight of the polystyrene-based resin is 100,000 or more, it is preferable without any defects that cause deterioration of the film. Furthermore, if the molecular weight of the polystyrene-based resin is 500,000 or less, there is no need to adjust the flow characteristics and there are no defects such as a decrease in extrudability, which is preferable.
中間層は、上記ポリスチレン系樹脂のほか、ポリエステル系樹脂を含有する。ここで言うポリエステル系樹脂は、上記表裏層で記述したものと同一のものを用いることができ、中でもジオール成分として、1,4−シクロヘキサンジメタノールを含有している低結晶性のポリエステル系樹脂を好適に用いることができる。中間層にポリエステル系樹脂を含有させることにより、表裏層に含まれるポリエステル系樹脂と相まって表裏層と中間層との層間接着を向上できるという効果が得られるほか、該フィルムのリターンを中間層に配合できるため、コスト的にもメリットがある。中間層におけるポリエステル系樹脂の含有量は、上記ポリスチレン系樹脂100質量部に対して1質量以上、好ましくは2質量%以上、さらに好ましくは5質量%以上とすることが望ましい。一方、前記ポリエステル系樹脂の含有量の上限値は30質量部、好ましくは20質量部、さらに好ましくは15質量部とすることができる。ポリエチレン系樹脂がポリスチレン系樹脂100質量部に対して1質量部以上含まれていれば、層間接着向上の効果が得られ、また上限を30質量部とすることにより、フィルムの透明性が低下することなく、かつ製膜時の延伸性も良好に維持できる。 The intermediate layer contains a polyester resin in addition to the polystyrene resin. The polyester resin used here can be the same as that described in the front and back layers, and among them, a low crystalline polyester resin containing 1,4-cyclohexanedimethanol as a diol component. It can be used suitably. By including a polyester resin in the intermediate layer, the effect of improving the interlayer adhesion between the front and back layers and the intermediate layer in combination with the polyester resin contained in the front and back layers is obtained, and the return of the film is blended in the intermediate layer Because it is possible, there is a merit in terms of cost. The content of the polyester resin in the intermediate layer is desirably 1 mass or more, preferably 2 mass% or more, more preferably 5 mass% or more with respect to 100 parts by mass of the polystyrene resin. On the other hand, the upper limit of the content of the polyester resin can be 30 parts by mass, preferably 20 parts by mass, and more preferably 15 parts by mass. If the polyethylene resin is contained in an amount of 1 part by mass or more with respect to 100 parts by mass of the polystyrene resin, an effect of improving interlayer adhesion is obtained, and the upper limit of 30 parts by mass reduces the transparency of the film. In addition, the stretchability during film formation can be maintained well.
本発明では、表面層および/または中間層に、上述した成分のほか、本発明の効果を著しく阻害しない範囲内で、成形加工性、生産性および熱収縮性フィルムの諸物性を改良・調整する目的で、フィルムの耳などのトリミングロス等から発生するリサイクル樹脂(通常は、中間層に添加することが好ましい)やシリカ、タルク、カオリン、炭酸カルシウム等の無機粒子、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、老化防止剤などの添加剤を適宜添加することもできる。 In the present invention, on the surface layer and / or the intermediate layer, in addition to the above-described components, various physical properties of the moldability, productivity, and heat shrinkable film are improved and adjusted within a range that does not significantly impair the effects of the present invention. Recycled resin generated from trimming loss such as film ears (usually preferably added to the intermediate layer), inorganic particles such as silica, talc, kaolin, calcium carbonate, titanium oxide, carbon black, etc. Additives such as pigments, flame retardants, weather resistance stabilizers, heat resistance stabilizers, antistatic agents, melt viscosity improvers, crosslinking agents, lubricants, nucleating agents, plasticizers, and antiaging agents may be added as appropriate.
<フィルムの層構成>
本発明のフィルムの厚みは特に制限はないが、原料コスト等を可能な限り抑える観点からは薄い方が好ましい。具体的には、延伸後の厚さは通常100μm以下であり、90μm以下であることが好ましく、80μm以下であることがより好ましく、70μm以下であることがさらに好ましく、60μm以下であることが最も好ましい。薄層タイプの場合、フィルムの厚みは40μm程度とすることが望ましい。
<Layer structure of film>
Although there is no restriction | limiting in particular in the thickness of the film of this invention, The thinner one is preferable from a viewpoint of suppressing raw material cost etc. as much as possible. Specifically, the thickness after stretching is usually 100 μm or less, preferably 90 μm or less, more preferably 80 μm or less, further preferably 70 μm or less, and most preferably 60 μm or less. preferable. In the case of a thin layer type, it is desirable that the thickness of the film is about 40 μm.
本発明のフィルムにおいて、表裏層と中間層との厚み比は、前記各作用を損なわないように設定すればよいが、より効果的に発現するためには、上記ポリエステル系樹脂を主とする表裏層と上記ポリスチレン系樹脂を主とする中間層との積層比を1/1/1〜1/10/1、好ましくは1/2/1〜1/8/1、さらに好ましくは1/3/1〜1/6/1であることが望ましい。中間層の厚みを表裏層の厚みと同等以上とすることにより、従来のポリエステル系熱収縮積層フィルムと比較して、ボトル装着時の収縮仕上がり特性を良好とすることができる。一方、中間層の厚みを表裏層の10倍以下とすることにより、収縮仕上がり性は良好であり、かつ従来のポリスチレン熱収縮積層フィルムより自然収縮を小さくすることができ、かつ腰の強いフィルムを得ることができる。 In the film of the present invention, the thickness ratio between the front and back layers and the intermediate layer may be set so as not to impair each of the above actions. The lamination ratio of the layer and the intermediate layer mainly composed of the polystyrene resin is 1/1/1 to 1/10/1, preferably 1/2/1 to 1/8/1, more preferably 1/3 /. It is desirable that it is 1-1 / 6/1. By making the thickness of the intermediate layer equal to or greater than the thickness of the front and back layers, it is possible to improve the shrink finish characteristics when the bottle is mounted, as compared with a conventional polyester heat shrink laminate film. On the other hand, by making the thickness of the intermediate layer 10 times or less that of the front and back layers, the shrink finish is good, and the natural shrinkage can be made smaller than that of the conventional polystyrene heat shrink laminate film. Obtainable.
<熱収縮率>
本発明のフィルムは、70℃温水中で10秒間加熱したときのフィルム主収縮方向の熱収縮率の下限値は5%、好ましくは7%、さらに好ましくは10%である。一方、フィルム主収縮方向の熱収縮率の上限値は25%、好ましくは23%、さらに好ましくは20%とすることが望ましい。なお、本明細書において主収縮方向とは、縦方向と横方向のうち延伸方向の大きい方を意味し、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である。
<Heat shrinkage>
In the film of the present invention, the lower limit of the heat shrinkage rate in the film main shrinkage direction when heated in 70 ° C. warm water for 10 seconds is 5%, preferably 7%, more preferably 10%. On the other hand, the upper limit value of the heat shrinkage rate in the film main shrinkage direction is 25%, preferably 23%, more preferably 20%. In the present specification, the main contraction direction means the larger one of the longitudinal direction and the transverse direction in the stretching direction. For example, in the case of mounting on a bottle, it is a direction corresponding to the outer peripheral direction.
フィルム主収縮方向の熱収縮率の下限値を5%とすることにより、蒸気シュリンカーでボトル装着を行う際に、局部的に発生し得る収縮ムラを抑え、結果的にシワ、アバタ等の形成を抑えることができる。また、熱収縮率の上限値を25%とすることにより、低温における極端な収縮を抑えることができ、例えば、夏場などの高温環境下においても自然収縮を小さく維持することができる。 By setting the lower limit of the thermal shrinkage rate in the main film shrinkage direction to 5%, shrinkage unevenness that can occur locally when bottles are attached with steam shrinker is suppressed, resulting in the formation of wrinkles, avatars, etc. Can be suppressed. Further, by setting the upper limit value of the heat shrinkage rate to 25%, extreme shrinkage at low temperatures can be suppressed, and for example, natural shrinkage can be kept small even in a high temperature environment such as summer.
本発明のフィルムは、80℃温水中で10秒間加熱したときのフィルム主収縮方向の熱収縮率は30%以上、好ましくは35%以上、さらに好ましくは40%以上である。一方、同温度における熱収縮率の上限値は60%以下、好ましくは、55%以下、さらに好ましくは50%以下であることが望ましい。 The film of the present invention has a heat shrinkage rate of 30% or more, preferably 35% or more, more preferably 40% or more when heated in 80 ° C. warm water for 10 seconds. On the other hand, the upper limit of the heat shrinkage rate at the same temperature is 60% or less, preferably 55% or less, more preferably 50% or less.
上記収縮率は、ペットボトルの収縮ラベル等、比較的短時間(数秒〜十数秒程度)で収縮加工する場合における適応性の判断指標とすることができる。例えば、ペットボトルの収縮ラベル用途に適用される熱収縮性フィルムに要求される必要な収縮率はその形状によって様々であるが一般に70〜80℃において20〜70%程度である。 The shrinkage rate can be used as a judgment index for adaptability when shrinking a relatively short time (several seconds to several tens of seconds) such as a shrinkage label of a PET bottle. For example, the required shrinkage rate required for a heat-shrinkable film applied to the use of shrinkage labels for PET bottles varies depending on the shape, but is generally about 20 to 70% at 70 to 80 ° C.
熱収縮性フィルムは、被覆対象物への熱影響を考慮すれば、できるだけ低い温度で十分熱収縮させることが必要である。工業生産性を考慮すれば、80℃の温水中10秒間加熱したときのフィルムの熱収縮率は30%以上、好ましくは35%以上、さらに好ましくは40%以上であれば、蒸気シュリンカー(収縮加工機)を用いた場合に、所定の収縮加工時間内に被覆対象物に十分密着させることができる。一方、80℃温水中で10秒間加熱したときのフィルム主収縮方向の熱収縮率の上限値を60%、好ましくは58%、さらに好ましくは55%とすることができれば、急激な熱収縮が起こり難いため、ボトル装着時に収縮ムラに起因するシワ、アバタなどの外観不良を生じ難くすることができる。 The heat-shrinkable film needs to be sufficiently heat-shrinked at the lowest possible temperature in consideration of the heat effect on the object to be coated. In consideration of industrial productivity, when the film has a heat shrinkage rate of 30% or more, preferably 35% or more, more preferably 40% or more when heated in warm water at 80 ° C. for 10 seconds, steam shrinker (shrinkage) When a processing machine is used, it can be sufficiently adhered to the object to be coated within a predetermined shrinkage processing time. On the other hand, if the upper limit of the heat shrinkage rate in the film main shrinkage direction when heated in 80 ° C. warm water for 10 seconds can be 60%, preferably 58%, more preferably 55%, rapid heat shrinkage occurs. Therefore, it is difficult to cause appearance defects such as wrinkles and avatars due to uneven shrinkage when the bottle is mounted.
本発明のフィルムが熱収縮性ラベルとして用いられる場合、縦方向(主収縮方向に対して垂直方向)の収縮率は、80℃温水中で10秒間加熱したときは10%以下であることが好ましく、5%以下であることがより好ましく、3%以下であることがさらに好ましい。また70℃温水中で10秒間加熱したときの縦方向の収縮率は、10%以下であることが好ましく、5%以下であることがより好ましく、3%以下であることがさらに好ましい。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歪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することができる。 When the film of the present invention is used as a heat-shrinkable label, the shrinkage in the longitudinal direction (perpendicular to the main shrinkage direction) is preferably 10% or less when heated in 80 ° C. warm water for 10 seconds. It is more preferably 5% or less, and further preferably 3% or less. Further, the contraction rate in the longitudinal direction when heated in 70 ° C. hot water for 10 seconds is preferably 10% or less, more preferably 5% or less, and further preferably 3% or less. If the film has a thermal shrinkage rate of 10% or less in the direction perpendicular to the main shrinkage direction, the dimension itself in the direction perpendicular to the main shrinkage direction after shrinkage may be shortened, or the printed pattern or character distortion after shrinkage may occur. In the case of a square bottle, troubles such as vertical sink can be made difficult to occur.
本発明のフィルムの自然収縮率はできるだけ小さいほうが望ましい。本発明のフィルムの自然収縮率は、30℃で30日保存後において3.0%以下、好ましくは2.0%以下、さらに好ましくは1.5%以下である。上記条件下における自然収縮率が3.0%であれば、作製したフィルムを長期保存する場合であっても容器等に安定して装着することができ、実用上問題を生じ難い。 The natural shrinkage rate of the film of the present invention is desirably as small as possible. The natural shrinkage ratio of the film of the present invention is 3.0% or less, preferably 2.0% or less, more preferably 1.5% or less after storage at 30 ° C. for 30 days. When the natural shrinkage rate is 3.0% under the above conditions, even if the produced film is stored for a long period of time, it can be stably attached to a container or the like, and there is hardly any problem in practical use.
本発明のフィルムの透明性は、JIS K7105に準拠して測定されたヘーズ値が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く、5%以下であることがさらに好ましい。ヘーズ値が10%以下であれば、フィルムの透明性が得られ、ディスプレー効果を奏することができる。 Regarding the transparency of the film of the present invention, the haze value measured according to JIS K7105 is preferably 10% or less, more preferably 7% or less, and even more preferably 5% or less. If the haze value is 10% or less, the transparency of the film can be obtained and a display effect can be obtained.
本発明のフィルムの耐破断性は、引張伸びにより評価され、0℃環境下の引張試験において、特にラベル用途ではフィルムの引き取り(流れ)方向(MD)で伸び率が100%以上、好ましくは200%以上、さらに好ましくは300%以上ある。 The rupture resistance of the film of the present invention is evaluated by tensile elongation. In a tensile test under an environment of 0 ° C., particularly for label use, the elongation is 100% or more in the film take-off (flow) direction (MD), preferably 200%. % Or more, more preferably 300% or more.
本発明のフィルムの剛性は、フィルムの引き取り方向(MD)および直交方向(TD)の引張弾性率を測定し、両者の平均値で表され、フィルムの腰として評価される。フィルムの剛性は、1000MPa以上であることが好ましく、1200MPa以上であることがより好ましく、1400MPa以上であることがさらに好ましい。 The rigidity of the film of the present invention is determined by measuring the tensile elastic modulus in the film take-up direction (MD) and the orthogonal direction (TD), and is expressed as an average value of both, and is evaluated as the waist of the film. The rigidity of the film is preferably 1000 MPa or more, more preferably 1200 MPa or more, and further preferably 1400 MPa or more.
本発明のフィルムのシール強度は、後述する実施例で記載された測定方法(23℃50%RH環境下で、T型剥離法にてTD方向に試験速度200mm/分で剥離する方法)を用いて3N/15mm以上、好ましくは5N/15mm以上、より好ましくは7N/15mm以上である。本発明のフィルムは、シール強度が3N/15mm以上であるため、使用時にシール部分が剥がれてしまう等のトラブルが生じることもない。 The sealing strength of the film of the present invention is measured using the measurement method described in the examples described later (a method of peeling in the TD direction at a test speed of 200 mm / min in a T-type peeling method in an environment of 23 ° C. and 50% RH). 3N / 15mm or more, preferably 5N / 15mm or more, more preferably 7N / 15mm or more. Since the film of the present invention has a seal strength of 3 N / 15 mm or more, troubles such as peeling of the seal portion during use do not occur.
本発明のフィルムは、公知の方法によって製造することができる。フィルムの形態としては平面状、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)や内面に印刷が可能という点から平面状が好ましい。平面状の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樹脂を溶融し、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をし、横方向にテンター延伸をし、アニールし、冷却し、(印刷が施される場合にはその面にコロナ放電処理をして、)巻取機にて巻き取ることによりフィルムを得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とする方法も適用できる。 The film of the present invention can be produced by a known method. The form of the film may be either flat or tube-like, but the flat form is preferable in terms of productivity (a few products can be taken in the width direction of the original film) and printing on the inner surface. . As a method for producing a flat film, for example, a resin is melted by using a plurality of extruders, co-extruded from a T die, solidified by cooling with a chilled roll, roll-stretched in the vertical direction, and tenter-stretched in the horizontal direction. An example is a method of obtaining a film by winding, annealing, cooling, and winding with a winder (corona discharge treatment is applied to the surface when printing is performed). Moreover, the method of cutting open the film manufactured by the tubular method and making it flat is also applicable.
延伸倍率はオーバーラップ用等、二方向に収縮させる用途では、縦方向が2〜10倍、横方向が2〜10倍、好ましくは縦方向が3〜6倍、横方向が3〜6倍程度である。一方、収縮ラベル用等、主として一方向に収縮させる用途では、主収縮方向に相当する方向が2〜10倍、好ましくは4〜8倍、それと直交する方向が1〜2倍(1倍とは延伸していな場合を指す)、好ましくは1.1〜1.5倍の、実質的には一軸延伸の範疇にある倍率比を選定するのことが望ましい。上記範囲内の延伸倍率で延伸した二軸延伸フィルムは、主収縮方向と直交する方向の熱収縮率が大きくなりすぎることはなく、例えば、収縮ラベルとして用いる場合、容器に装着するとき容器の高さ方向にもフィルムが熱収縮する、いわゆる縦引け現象を抑えることができるため好ましい。 In applications where the stretching ratio is contracted in two directions, such as for overlap, the longitudinal direction is 2 to 10 times, the transverse direction is 2 to 10 times, preferably the longitudinal direction is 3 to 6 times, and the transverse direction is about 3 to 6 times. It is. On the other hand, in applications that shrink mainly in one direction, such as for shrink labels, the direction corresponding to the main shrinking direction is 2 to 10 times, preferably 4 to 8 times, and the direction perpendicular to it is 1 to 2 times (1 times is It is desirable to select a magnification ratio that is 1.1 to 1.5 times, substantially in the category of uniaxial stretching. A biaxially stretched film stretched at a stretch ratio within the above range does not have an excessively large thermal shrinkage rate in the direction orthogonal to the main shrinkage direction.For example, when used as a shrinkage label, It is preferable because the so-called vertical shrinkage phenomenon, in which the film is thermally contracted in the vertical direction, can be suppressed.
[成形品および容器]
本発明のフィルムは、フィルムの収縮仕上がり性、透明性、自然収縮等に優れているため、その用途が特に制限されるものではないが、ボトル(ブローボトル)、トレー、弁当箱、総菜容器、乳製品容器等の様々な成形品として用いることができる。特に本発明のフィルムを食品容器(例えば清涼飲料水用または食品用のPETボトル、ガラス瓶、好ましくはPETボトル)用ラベルとして用いる場合、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)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。
[Molded products and containers]
The film of the present invention is excellent in the shrink finish of the film, transparency, natural shrinkage, etc., so its use is not particularly limited, but bottles (blow bottles), trays, lunch boxes, prepared food containers, It can be used as various molded products such as dairy containers. In particular, when the film of the present invention is used as a label for food containers (for example, PET bottles, glass bottles, preferably PET bottles for soft drinks or foods), a complicated shape (for example, a cylinder with a constricted center, four rounded corners). Even if it is a prism, pentagon, hexagonal column, etc., it is possible to obtain a container that can be adhered to the shape and has a beautiful label without wrinkles or avatars.
以下に本発明について実施例を用いて説明する。なお、実施例に示す測定値および評価は次のように行った。ここでは、積層フィルムの引き取り(流れ)方向を「縦」方向、その直角方向を「横」方向と記載する。 The present invention will be described below with reference to examples. In addition, the measured value and evaluation which are shown to an Example were performed as follows. Here, the take-up (flow) direction of the laminated film is described as the “longitudinal” direction, and the direction perpendicular thereto is described as the “lateral” direction.
(1)層間強度
フィルムの横方向の両端より10mmの位置で、シクロヘキサン10質量%、n−ヘキサン90質量%からなる混合溶剤を用いて接着し、筒状ラベルを製造した。シール部分を円周と直角方向に5mm幅に切り取り、それを恒温槽付引張試験機((株)インテスコ製「201X」)を使用し、剥離試験を行った。
表裏層−中間層の層間で剥離が生じたものを×、層間ではなくフィルムの界面で剥離したものを○とした。
(1) Interlaminar strength At a position 10 mm from both ends of the film in the lateral direction, a cylindrical label was produced by bonding using a mixed solvent consisting of 10% by mass of cyclohexane and 90% by mass of n-hexane. The seal portion was cut to a width of 5 mm in a direction perpendicular to the circumference, and a peel test was performed using a tensile tester with a thermostatic bath (“201X” manufactured by Intesco Corporation).
The case where peeling occurred between the front and back layer-intermediate layer was evaluated as x, and the case where peeling occurred not at the layer but at the interface of the film was evaluated as ◯.
(2)熱収縮率
フィルムを縦100mm、横100mmの大きさに切り取り、70℃および80℃の温水バスに10秒間それぞれ浸漬し、収縮量を測定した。熱収縮率は、縦方向および横方向について、収縮前の原寸に対する収縮量の比率を%値で表示した。
(2) Thermal contraction rate The film was cut into a size of 100 mm in length and 100 mm in width, and immersed in a hot water bath at 70 ° C. and 80 ° C. for 10 seconds, and the shrinkage was measured. For the thermal shrinkage, the ratio of shrinkage to the original size before shrinkage was expressed in% in the vertical and horizontal directions.
(3)自然収縮率
フィルムから縦100mm、横1000mmの大きさに切り取り、30℃の雰囲気の恒温槽に30日間放置し、主収縮方向について、収縮前の原寸に対する収縮量を測定し、その比率を%値で表示した。
(3) Natural shrinkage rate The film was cut into a size of 100 mm in length and 1000 mm in width and left in a constant temperature bath at 30 ° C. for 30 days. In the main shrinkage direction, the amount of shrinkage relative to the original size before shrinkage was measured, and the ratio Is expressed as a% value.
(4)ヘーズ
JIS K7105に準拠してフィルム厚み50μmでフィルムのヘーズ値を測定した。
(4) Haze The haze value of the film was measured at a film thickness of 50 μm according to JIS K7105.
(5)収縮仕上がり性
10mm間隔の格子目を印刷したフィルムをMD100mm×TD298mmの大きさに切り取り、TDの両端を10mm重ねて溶剤等で接着し、円筒状フィルムを作製した。この円筒状フィルムを、容量1.5Lの円筒型ペットボトルに装着し、蒸気加熱方式の長さ3.2m(3ゾーン)の収縮トンネル中を回転させずに、約4秒間で通過させた。各ゾーンでのトンネル内雰囲気温度は、蒸気量を蒸気バルブで調整し、70〜85℃の範囲とした。フィルム被覆後は下記基準で評価した。
○:収縮が十分でシワ、アバタ、格子目の歪みがなく密着性が良好
×:収縮は十分だがシワ、アバタ、格子目の歪みが生じる
(5) Shrinkage Finishing A film printed with a grid of 10 mm intervals was cut into a size of MD 100 mm × TD 298 mm, and both ends of TD were stacked 10 mm and adhered with a solvent or the like to produce a cylindrical film. This cylindrical film was attached to a cylindrical PET bottle with a capacity of 1.5 L, and passed through the steam heating type 3.2 m (3 zones) shrink tunnel for about 4 seconds without rotating. The atmospheric temperature in the tunnel in each zone was set to a range of 70 to 85 ° C. by adjusting the amount of steam with a steam valve. After film coating, the following criteria were evaluated.
○: Shrinkage is sufficient and there is no wrinkle, avatar, or lattice distortion, and adhesion is good. ×: Shrinkage is sufficient, but wrinkle, avatar, and lattice distortion occur
(実施例1)
上記表裏層となるポリエステル系樹脂(イーズトマンケミカル社製 イースター6763)(以下「PETGと略称する」)100質量部、およびエポキシ変性スチレン系エラストマー(ダイセル化学(株)製 エポフレンドAT501)(以下「変性TPEと略称する」)10質量部をブレンドした組成物、中間層となるSBS−I(スチレン/ブタジエン=90/10)50質量部、SBS−II(スチレン/ブタジエン=71/29)50質量部に対してPETG10質量部をブレンドしたポリマー組成物を、それぞれ同方向2軸押出機を用いて溶融混練し、組成物のペレットを得た。このペレットをそれぞれ別個の押出機に投入後、各層の厚みが表裏層/中間層/表裏層=1/6/1となるよう3層ダイスより共押出し、60℃キャストロールで引き取り、固化させて厚さ200μmの未延伸積層シートを得た。テンター延伸設備内にて温度90℃で一軸方向に5.5倍延伸し、膜厚50μmの熱収縮性フィルムを作製した。この熱収縮積層フィルムの評価結果を表1に示す。
Example 1
100 parts by mass of a polyester resin (Easter 6673 manufactured by Eastoman Chemical Co., Ltd.) (hereinafter abbreviated as “PETG”) and epoxy-modified styrene elastomer (Epofriend AT501 manufactured by Daicel Chemical Co., Ltd.) (hereinafter “Eptofriend AT501”) Composition abbreviated as “modified TPE”)) 10 parts by mass, SBS-I (styrene / butadiene = 90/10) 50 parts by mass, SBS-II (styrene / butadiene = 71/29) 50 parts as an intermediate layer A polymer composition obtained by blending 10 parts by mass of PETG with respect to parts was melt-kneaded using a biaxial extruder in the same direction to obtain pellets of the composition. After the pellets are put into separate extruders, they are co-extruded from a three-layer die so that the thickness of each layer is front / back layer / intermediate layer / front / back layer = 1/6/1, taken up by a 60 ° C. cast roll, and solidified. An unstretched laminated sheet having a thickness of 200 μm was obtained. The film was stretched 5.5 times in a uniaxial direction at a temperature of 90 ° C. in a tenter stretching facility to produce a heat-shrinkable film having a thickness of 50 μm. The evaluation results of this heat shrink laminate film are shown in Table 1.
(実施例2)
実施例1で表面層に用いたPETGと変性TPEの質量比をPETG100質量部に対して変性TPE15質量部に変更し、中間層におけるSBS−II50質量部に対してPETG20質量部に変更した以外は、実施例1と同様の方法により膜厚50μmの熱収縮性フィルムを作製した。この熱収縮積層フィルムの評価結果を表1に示す。
(Example 2)
Except for changing the mass ratio of PETG and modified TPE used in the surface layer in Example 1 to 15 parts by mass of modified TPE with respect to 100 parts by mass of PETG and changing to 20 parts by mass of PETG with respect to 50 parts by mass of SBS-II in the intermediate layer. A heat-shrinkable film having a thickness of 50 μm was produced by the same method as in Example 1. The evaluation results of this heat shrink laminate film are shown in Table 1.
(実施例3)
実施例1で表面層に用いたPETGと変性TPEの質量比をPETG100質量部に対して変性TPE20質量部に変更し、中間層におけるSBS−II50質量部に対してPETG30質量部に変更した以外は、実施例1と同様の方法により膜厚50μmの熱収縮性フィルムを作製した。この熱収縮積層フィルムの評価結果を表1に示す。
(Example 3)
Except for changing the mass ratio of PETG and modified TPE used in the surface layer in Example 1 to 20 parts by mass of modified TPE with respect to 100 parts by mass of PETG and changing to 30 parts by mass of PETG with respect to 50 parts by mass of SBS-II in the intermediate layer. A heat-shrinkable film having a film thickness of 50 μm was produced in the same manner as in Example 1. The evaluation results of this heat shrink laminate film are shown in Table 1.
(比較例1)
上記表裏層をポリエステル系樹脂PETG100質量部、中間層をSBS−I50質量部とSBS−II50質量部をブレンドしたポリマー組成物に変更した以外は、実施例1と同様の方法で膜厚50μmの熱収縮性フィルムを作製した。この熱収縮積層フィルムの評価結果を表1に示す。
(Comparative Example 1)
Heat having a film thickness of 50 μm was obtained in the same manner as in Example 1 except that the front and back layers were changed to a polymer composition obtained by blending 100 parts by mass of polyester resin PETG and the intermediate layer by blending 50 parts by mass of SBS-I and 50 parts by mass of SBS-II. A shrinkable film was prepared. The evaluation results of this heat shrink laminate film are shown in Table 1.
(比較例2)
実施例1における表裏層の組成をPETG100質量部と変性TPE30質量部のブレンドに変更した以外、実施例1と同様の方法で膜厚50μmの熱収縮性フィルムを作製した。この熱収縮積層フィルムの評価結果を表1に示す。
(Comparative Example 2)
A heat-shrinkable film having a thickness of 50 μm was produced in the same manner as in Example 1 except that the composition of the front and back layers in Example 1 was changed to a blend of 100 parts by mass of PETG and 30 parts by mass of modified TPE. The evaluation results of this heat shrink laminate film are shown in Table 1.
(比較例3)
実施例1における表裏層の組成をPETG100質量部と変性TPE20質量部のブレンドに変更し、中間層の組成をSBS−I50質量部とSBS−II50質量部に対してPETG20質量部をブレンドしたポリマーに変更した以外は、実施例1と同様の方法で膜厚50μmの熱収縮性フィルムを作製した。この熱収縮積層フィルムの評価結果を表1に示す。
(Comparative Example 3)
The composition of the front and back layers in Example 1 was changed to a blend of 100 parts by mass of PETG and 20 parts by mass of modified TPE, and the composition of the intermediate layer was changed to a polymer in which 20 parts by mass of PETG was blended with 50 parts by mass of SBS-I and 50 parts by mass of SBS-II. A heat-shrinkable film having a thickness of 50 μm was produced in the same manner as in Example 1 except that the change was made. The evaluation results of this heat shrink laminate film are shown in Table 1.
(比較例4)
実施例1における表裏層の組成をPETG100質量部と変性TPE20質量部のブレンドに変更し、中間層の組成をSBS−I50質量部とSBS−II50質量部とをブレンドしたポリマーに変更した以外、実施例1と同様の方法で膜厚50μmの熱収縮性フィルムを作製した。この熱収縮積層フィルムの評価結果を表1に示す。
(Comparative Example 4)
Implementation was performed except that the composition of the front and back layers in Example 1 was changed to a blend of 100 parts by mass of PETG and 20 parts by mass of modified TPE, and the composition of the intermediate layer was changed to a polymer blended with 50 parts by mass of SBS-I and 50 parts by mass of SBS-II. A heat-shrinkable film having a thickness of 50 μm was produced in the same manner as in Example 1. The evaluation results of this heat shrink laminate film are shown in Table 1.
(比較例5)
実施例1における表裏層の組成をPETG100質量部のみに変更した以外、実施例1と同様の方法で膜厚50μmの熱収縮性フィルムを作製した。この熱収縮積層フィルムの評価結果を表1に示す。
(Comparative Example 5)
A heat-shrinkable film having a thickness of 50 μm was produced in the same manner as in Example 1 except that the composition of the front and back layers in Example 1 was changed to only 100 parts by mass of PETG. The evaluation results of this heat shrink laminate film are shown in Table 1.
表1より本発明で規定する範囲内の中間層および両外層を有する実施例1ないし3のフィルムは、層間接着、自然収縮率、ヘーズ値、収縮仕上がり性がいずれも比較例1ないし5よりも優れていた。これに対し、本発明に規定する範囲外の組成を有する比較例1ないし4のフィルムは、層間接着、自然収縮率、ヘーズおよび収縮仕上がり性のいずれかの特性が本発明のフィルムよりも劣っていた。
これより、本発明のフィルムは、収縮仕上がり性、透明性、自然収縮に優れ、かつフィルム内の層間剥離が抑制された熱収縮性積層フィルムであることが分かる。
From Table 1, the films of Examples 1 to 3 having an intermediate layer and both outer layers within the range specified by the present invention are all in comparison with Comparative Examples 1 to 5 in terms of interlayer adhesion, natural shrinkage, haze value, and shrink finish. It was excellent. On the other hand, the films of Comparative Examples 1 to 4 having compositions outside the range defined in the present invention are inferior to the film of the present invention in any one of interlayer adhesion, natural shrinkage rate, haze and shrinkage finish. It was.
From this, it can be seen that the film of the present invention is a heat-shrinkable laminated film that is excellent in shrink finish, transparency, and natural shrinkage and in which delamination in the film is suppressed.
本発明のフィルムは、収縮仕上がり性、透明性、自然収縮に優れ、かつフィルム内の層間剥離が抑制された熱収縮性積層フィルムであるため、ボトル(ブローボトル)、トレー、弁当箱、総菜容器、乳製品容器等の各種の成形品として利用できる。特に製造工程において中間層にリターン可能であるためコスト的にも非常に有利である。
Since the film of the present invention is a heat-shrinkable laminated film excellent in shrink finish, transparency, and natural shrinkage, and delamination in the film is suppressed, bottles (blow bottles), trays, lunch boxes, prepared food containers It can be used as various molded products such as dairy containers. In particular, since it can be returned to the intermediate layer in the manufacturing process, it is very advantageous in terms of cost.
Claims (10)
A container equipped with the molded product according to claim 8 or 9.
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JP5235494B2 (en) * | 2007-05-15 | 2013-07-10 | 三菱樹脂株式会社 | Laminated film, molded product using the film, heat shrinkable label, and container equipped with the label |
JP4922973B2 (en) * | 2008-03-18 | 2012-04-25 | グンゼ株式会社 | Heat-shrinkable multilayer film and heat-shrinkable label |
JP5294974B2 (en) * | 2009-05-14 | 2013-09-18 | 三菱樹脂株式会社 | Heat-shrinkable laminated film, molded product using the film, heat-shrinkable label, and container |
JP6027333B2 (en) * | 2012-04-10 | 2016-11-16 | 旭化成株式会社 | Heat shrink laminate film |
JP6027378B2 (en) * | 2012-09-26 | 2016-11-16 | 旭化成株式会社 | Laminated sheet and film |
JP6555865B2 (en) * | 2014-09-19 | 2019-08-07 | 株式会社フジシールインターナショナル | Shrink label |
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