JP5560520B2 - Laminated material for paper containers and liquid paper container - Google Patents

Laminated material for paper containers and liquid paper container Download PDF

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JP5560520B2
JP5560520B2 JP2007063126A JP2007063126A JP5560520B2 JP 5560520 B2 JP5560520 B2 JP 5560520B2 JP 2007063126 A JP2007063126 A JP 2007063126A JP 2007063126 A JP2007063126 A JP 2007063126A JP 5560520 B2 JP5560520 B2 JP 5560520B2
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行宏 中村
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Toppan Inc
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果汁飲料、ジュース、お茶類、コーヒー、乳飲料、スープ等のノンアルコール飲料や清酒、焼酎等のアルコール飲料を包装する容器に使用する紙容器用積層材料及びそれを用いた液体用紙容器に関するものである。   It relates to laminated materials for paper containers used in containers for packaging non-alcoholic drinks such as fruit juice drinks, juices, teas, coffee, milk drinks, soups, and alcoholic drinks such as sake and shochu, and liquid paper containers using the same. is there.

従来、紙容器用積層材料としては、外側から順に、ポリオレフィン系樹脂層、基材層、接着性樹脂層、ガスバリア層、接着剤層、シーラント層が積層された多層構成のものが多く使用されており、前記シーラント層としては、通常、低密度ポリエチレン樹脂が使用され、前記接着剤層にはポリウレタン系接着剤が使用されている。シーラント層に低密度ポリエチレン樹脂を使用し、接着剤層にポリウレタン系接着剤を使用した構成の紙容器用積層材料を用いて製函した液体用紙容器は、中に液状の内容物を包装した場合、接着剤層に使用したポリウレタン系接着剤由来の成分がシーラント層を通過して内容物中に移行し、内容物の品質、特に、味覚を損なってしまうなどの問題があった。これらの問題を改善するべく、接着剤層を介さないでシーラント層を直接他の層に積層した構成の包装材料が提案されている(例えば、特許文献1参照。)。
特開2002−192675号公報
Conventionally, as a laminated material for paper containers, a multi-layer structure in which a polyolefin resin layer, a base material layer, an adhesive resin layer, a gas barrier layer, an adhesive layer, and a sealant layer are laminated in order from the outside is often used. In general, a low-density polyethylene resin is used as the sealant layer, and a polyurethane-based adhesive is used as the adhesive layer. A liquid paper container made with a laminated material for paper containers that uses a low-density polyethylene resin for the sealant layer and a polyurethane adhesive for the adhesive layer, in which liquid contents are packaged The components derived from the polyurethane-based adhesive used in the adhesive layer pass through the sealant layer and migrate into the content, and there is a problem that the quality of the content, particularly the taste, is impaired. In order to improve these problems, a packaging material having a structure in which a sealant layer is directly laminated on another layer without using an adhesive layer has been proposed (for example, see Patent Document 1).
JP 2002-192675 A

本発明の課題は、シーラント層が接着剤層を介して他層に積層されている多層構成の紙容器用積層材料であって、接着剤層の接着剤に由来する成分がシーラント層を通過して内面側に移行しない紙容器用積層材料及びそれを用いた液体用紙容器を提供することにある。   An object of the present invention is a laminated material for a paper container having a multilayer structure in which a sealant layer is laminated on another layer via an adhesive layer, and a component derived from the adhesive of the adhesive layer passes through the sealant layer. Another object of the present invention is to provide a laminated material for paper containers that does not shift to the inner surface side, and a liquid paper container using the same.

本発明の請求項1に係わる発明は、板紙からなる基材層の一方の面にポリオレフィン系樹脂層を積層し、他方の面に少なくとも、低密度ポリエチレン、エチレン・アクリル酸共重合体、エチレン・メタクリル酸共重合体のいずれかからなる接着性樹脂層、ガスバリア層、接着剤層、シーラント層をこの順に積層した積層体からなる紙容器用積層材料において、前記接着剤層は、水酸基を持った主剤とイソシアネート基を持った硬化剤とを2液混合して使用する2液混合型のポリウレタン系接着剤からなり、該シーラント層は少なくともポリエチレン樹脂層と、エチレン・環状オレフィンランダム共重合体、環状オレフィンの開環共重合体の水素化物樹脂、エチレン・環状オレフィンランダム共重合体のグラフト変性樹脂、環状オレフィンの開環共重合体のグラフト変性樹脂のいずれかからなる環状オレフィン樹脂層とからなり、内容物に接する面がポリエチレン樹脂層である多層共押出フィルムからなり、前記環状オレフィン層と前記ポリエチレン層の厚み比率が1/1〜9/1であることを特徴とする紙容器用積層材料である。
In the invention according to claim 1 of the present invention, a polyolefin resin layer is laminated on one side of a base material layer made of paperboard, and at least low-density polyethylene, an ethylene / acrylic acid copolymer, In a laminated material for paper containers comprising a laminate in which an adhesive resin layer, a gas barrier layer, an adhesive layer, and a sealant layer made of any of methacrylic acid copolymers are laminated in this order, the adhesive layer has a hydroxyl group. Consists of a two-component mixed polyurethane adhesive that uses a mixture of the main agent and a curing agent having an isocyanate group. The sealant layer comprises at least a polyethylene resin layer, an ethylene / cyclic olefin random copolymer, and a cyclic Olefin ring-opening copolymer hydride resin, ethylene / cyclic olefin random copolymer graft-modified resin, cyclic olefin opening Consists of a cyclic olefin resin layer consisting of either a graft-modified copolymer resin, the surface in contact with the contents are a multilayer co-extruded film is a polyethylene resin layer, the thickness ratio of the cyclic olefin layer and the polyethylene layer A laminated material for paper containers, which is 1/1 to 9/1 .

本発明の請求項2に係る発明は、板紙からなる基材層の一方の面にポリオレフィン系樹脂層を積層し、他方の面に少なくとも、低密度ポリエチレン、エチレン・アクリル酸共重合体、エチレン・メタクリル酸共重合体のいずれかからなる接着性樹脂層、ガスバリア層、接着剤層、シーラント層をこの順に積層した積層体からなる紙容器用積層材料において、
前記接着剤層は、水酸基を持った主剤とイソシアネート基を持った硬化剤とを2液混合して使用する2液混合型のポリウレタン系接着剤からなり、該シーラント層は少なくともポリエチレン樹脂層と、エチレン・環状オレフィンランダム共重合体、環状オレフィンの開環共重合体の水素化物樹脂、エチレン・環状オレフィンランダム共重合体のグラフト変性樹脂、環状オレフィンの開環共重合体のグラフト変性樹脂のいずれかからなる環状オレフィン樹脂層とからなり、前記シーラント層がポリエチレン樹脂層、環状オレフィン樹脂層、ポリエチレン樹脂層がこの順に三層共押出法によって積層されており、
ポリエチレン樹脂層、環状オレフィン樹脂層、ポリエチレン樹脂層の厚み比率が1/1/1〜3/1/3であることを特徴とする紙容器用積層材料である。
In the invention according to claim 2 of the present invention, a polyolefin resin layer is laminated on one side of a base material layer made of paperboard, and at least the low density polyethylene, an ethylene / acrylic acid copolymer, an ethylene. In a laminated material for a paper container comprising a laminate in which an adhesive resin layer, a gas barrier layer, an adhesive layer, and a sealant layer made of any of methacrylic acid copolymers are laminated in this order,
The adhesive layer comprises a two-component mixed polyurethane adhesive that is used by mixing two main components having a hydroxyl group and a curing agent having an isocyanate group, and the sealant layer includes at least a polyethylene resin layer, Either ethylene / cyclic olefin random copolymer, cyclic olefin ring-opening copolymer hydride resin, ethylene / cyclic olefin random copolymer graft-modified resin, or cyclic olefin ring-opening copolymer graft-modified resin And the sealant layer is laminated by a three-layer coextrusion method in this order, a polyethylene resin layer, a cyclic olefin resin layer, and a polyethylene resin layer,
A laminated material for paper containers, wherein the thickness ratio of the polyethylene resin layer, the cyclic olefin resin layer, and the polyethylene resin layer is 1/1/1 to 3/1/3 .

本発明の紙容器用積層材料は、板紙からなる基材層の一方の面にポリオレフィン系樹脂層を積層し、他方の面に少なくとも、接着性樹脂層、ガスバリア層、接着剤層、シーラント層を積層した積層体からなる紙容器用積層材料において、該シーラント層が内容物に接
する側の最外面がポリエチレン樹脂層で、反対側の最外面が環状オレフィン樹脂層である多層フィルムからなるか、あるいは、該シーラント層が環状オレフィン樹脂層の両側の最外面にポリエチレン樹脂層を有する多層フィルムからなっているので、シーラント層に含まれる環状オレフィン樹脂層が接着剤層の接着剤に由来する成分がシーラント層全体を通過して内面側に移行するのを防止する役割を果たす。また、液体用紙容器が前記紙容器用積層材料を用いて、シーラント層面が内容物に接するようにして製函したものからなっているので、接着剤由来の成分が充填包装した内容物中に移行せず、初期品質を良好に保持する。
The laminated material for paper containers of the present invention comprises a polyolefin resin layer laminated on one side of a base material layer made of paperboard, and at least an adhesive resin layer, a gas barrier layer, an adhesive layer, and a sealant layer on the other side. In the laminated material for a paper container comprising a laminated body, the outermost surface on the side where the sealant layer is in contact with the contents is a polyethylene resin layer, and the opposite outermost surface is a multilayer film having a cyclic olefin resin layer, or Since the sealant layer is composed of a multilayer film having polyethylene resin layers on the outermost surfaces on both sides of the cyclic olefin resin layer, the cyclic olefin resin layer contained in the sealant layer is derived from the adhesive of the adhesive layer. It plays the role of preventing the transition to the inner surface side through the entire layer. In addition, since the liquid paper container is made of the above-mentioned laminated material for paper containers, and the sealant layer surface is in contact with the contents, it is transferred into the contents filled and packed with the adhesive-derived components. The initial quality is kept good.

本発明の紙容器用積層材料を、実施の形態に沿って以下に詳細に説明する。図1(a)は本発明の紙容器用積層材料の一実施形態を示す側断面図であり、紙容器用積層材料(20)は外側から厚み方向に順に、ポリオレフィン系樹脂層(2)、基材層(1)、接着性樹脂層(3)、ガスバリア層(4)、接着剤層(5)、シーラント層(10)が積層されており、前記シーラント層(10)は環状オレフィン樹脂層(6)とポリエチレン樹脂層(7)との二層フィルムからなっている。図1(b)は紙容器用積層材料の他の実施形態を示す側断面図であり、紙容器用積層材料(21)は外側から厚み方向に順に、ポリオレフィン系樹脂層(2)、基材層(1)、接着性樹脂層(3)、ガスバリア層(4)、接着剤層(5)、シーラント層(11)が積層されており、前記シーラント層(11)はポリエチレン樹脂層(7)とポリエチレン樹脂層(8)の間に環状オレフィン樹脂層(6)を有する三層フィルムからなっている。   The laminated material for paper containers of the present invention will be described in detail below along the embodiments. FIG. 1 (a) is a side sectional view showing an embodiment of a laminated material for paper containers of the present invention. The laminated material for paper containers (20) is a polyolefin-based resin layer (2) in order from the outside in the thickness direction. A base material layer (1), an adhesive resin layer (3), a gas barrier layer (4), an adhesive layer (5), and a sealant layer (10) are laminated, and the sealant layer (10) is a cyclic olefin resin layer. It consists of a two-layer film of (6) and a polyethylene resin layer (7). FIG. 1B is a side sectional view showing another embodiment of the paper container laminate material. The paper container laminate material (21) is a polyolefin-based resin layer (2) and a base material in order from the outside in the thickness direction. A layer (1), an adhesive resin layer (3), a gas barrier layer (4), an adhesive layer (5), and a sealant layer (11) are laminated, and the sealant layer (11) is a polyethylene resin layer (7). And a three-layer film having a cyclic olefin resin layer (6) between the polyethylene resin layer (8).

前記紙容器用積層材料(20、21)は、ガスバリア層(4)と接着剤層(5)の間に、さらに、二軸延伸ポリエステルフィルムなどからなる補強フィルム層を接着剤を介して積層した構成でも構わない。   The laminated material for paper containers (20, 21) is formed by laminating a reinforcing film layer made of a biaxially stretched polyester film or the like between the gas barrier layer (4) and the adhesive layer (5) via an adhesive. It does not matter if it is configured.

前記基材層(1)は、坪量200〜500g/m2の板紙からなっている。 The base layer (1) is made from paperboard having a basis weight of 200-500 g / m 2.

前記ポリオレフィン系樹脂層(2)には、主に、厚みが3〜40μmの低密度ポリエチレン樹脂が使用され、積層方法は公知の溶融押出ラミネーション法で積層する。   For the polyolefin resin layer (2), a low density polyethylene resin having a thickness of 3 to 40 μm is mainly used, and a lamination method is laminated by a known melt extrusion lamination method.

前記接着性樹脂層(3)には、低密度ポリエチレン樹脂、エチレン・アクリル酸共重合樹脂、エチレン・メタクリル酸共重合樹脂、アイオノマー樹脂などが使用可能である。厚みは5〜50μmが好ましい。   For the adhesive resin layer (3), a low-density polyethylene resin, an ethylene / acrylic acid copolymer resin, an ethylene / methacrylic acid copolymer resin, an ionomer resin, or the like can be used. The thickness is preferably 5 to 50 μm.

前記ガスバリア層(4)は、単層構成又は積層構成の材料からなっており、単層構成の材料としては、ニ軸延伸ポリエステルフィルム、エチレン・ビニルアルコール共重合体フィルム、アルミニウム箔などが使用され、積層構成の材料としては、アルミニウム蒸着ポリエステルフィルム、二軸延伸ポリエステルフィルムの片面に少なくとも、酸化珪素若しくは酸化アルミニウムなどの無機酸化物の蒸着薄膜層を積層したガスバリア性フィルムなどが使用される。   The gas barrier layer (4) is made of a material having a single layer structure or a laminated structure, and as the material of the single layer structure, a biaxially stretched polyester film, an ethylene / vinyl alcohol copolymer film, an aluminum foil, or the like is used. As the material of the laminated structure, an aluminum vapor-deposited polyester film or a gas barrier film in which a vapor-deposited thin film layer of an inorganic oxide such as silicon oxide or aluminum oxide is laminated on one side of a biaxially stretched polyester film is used.

前記接着剤層(5)は、ポリウレタン系接着剤からなっており、水酸基を持った主剤とイソシアネート基を持った硬化剤とを2液混合して使用する2液型の接着剤が使用され、塗布量は1〜5g/m2(乾燥状態)が良い。 The adhesive layer (5) is made of a polyurethane-based adhesive, and a two-component adhesive is used in which two components of a main component having a hydroxyl group and a curing agent having an isocyanate group are mixed. The coating amount is preferably 1 to 5 g / m 2 (dry state).

前記シーラント層(10)は、環状オレフィン樹脂層(6)とポリエチレン樹脂層(7)との二層フィルムからなっており、前記二層フィルムは環状オレフィン樹脂とポリエチレン樹脂を使用して、二層共押出法で押し出して、製膜し作成する。環状オレフィン樹脂層(6)とポリエチレン樹脂層(7)との厚み比率は、環状オレフィン樹脂層(6)/ポリエチレン樹脂層(7)=1/1〜9/1(厚み比率)が好ましく、総厚は30〜90μmが好ましい。積層方法は公知のドライラミネーションで積層する。   The sealant layer (10) is composed of a two-layer film of a cyclic olefin resin layer (6) and a polyethylene resin layer (7), and the two-layer film is composed of two layers using a cyclic olefin resin and a polyethylene resin. Extruded by co-extrusion method to form a film. The thickness ratio between the cyclic olefin resin layer (6) and the polyethylene resin layer (7) is preferably cyclic olefin resin layer (6) / polyethylene resin layer (7) = 1/1 to 9/1 (thickness ratio). The thickness is preferably 30 to 90 μm. The lamination is performed by a known dry lamination.

前記シーラント層(11)は、ポリエチレン樹脂層(7)とポリエチレン樹脂層(8)との間に環状オレフィン樹脂層(6)を有する三層フィルムからなっており、前記三層フィルムはポリエチレン樹脂と環状オレフィン樹脂を使用して、三層共押出法で押し出して製膜し、作成する。この場合の各層の厚み比率は、ポリエチレン樹脂層(7)/環状オレフィン樹脂層(6)/ポリエチレン樹脂層(8)=1/1/1〜3/1/3が好ましく、総厚は30〜90μmが好ましい。   The sealant layer (11) is composed of a three-layer film having a cyclic olefin resin layer (6) between a polyethylene resin layer (7) and a polyethylene resin layer (8). Using a cyclic olefin resin, a film is formed by extrusion by a three-layer coextrusion method. The thickness ratio of each layer in this case is preferably polyethylene resin layer (7) / cyclic olefin resin layer (6) / polyethylene resin layer (8) = 1/1 / 1-3 / 1/3, and the total thickness is 30- 90 μm is preferable.

前記環状オレフィン樹脂層(6)に使用される樹脂の種類としては、例えば、エチレン・環状オレフィンランダム共重合体樹脂、環状オレフィンの開環共重合体の水素化物樹脂、エチレン・環状オレフィンランダム共重合体のグラフト変性樹脂、環状オレフィンの開環共重合体のグラフト変性樹脂などがある。   Examples of the resin used in the cyclic olefin resin layer (6) include ethylene / cyclic olefin random copolymer resin, cyclic olefin ring-opening copolymer hydride resin, and ethylene / cyclic olefin random copolymer. There are a graft-modified resin of a coalescence, a graft-modified resin of a ring-opening copolymer of a cyclic olefin, and the like.

本発明の紙容器用積層材料は、上記記載の如く、シーラント層の構成の中に環状オレフィン樹脂層を含んでいるので、その環状オレフィン樹脂層が、接着剤層に使用した接着剤由来の成分がシーラント層を通過して内側に移行するのを防止する作用効果を果たす特徴を有している。   Since the laminated material for paper containers of the present invention includes a cyclic olefin resin layer in the structure of the sealant layer as described above, the cyclic olefin resin layer is a component derived from the adhesive used for the adhesive layer. It has the characteristic which fulfill | performs the effect which prevents that it passes to a inner side through a sealant layer.

本発明の液体用紙容器は、前記紙容器用積層材料(20)または紙容器用積層材料(21)を用いて、それぞれシーラント層(10)又はシーラント層(11)面が内容物に接するように製函したものからなっており、充填包装した内容物の味などの初期品質を良好に保持する。液体用紙容器の形態としては、特に限定されないが、例えば、フラットトップタイプあるいはゲーベルトップタイプの角型の液体用紙容器などがある。   In the liquid paper container of the present invention, the surface of the sealant layer (10) or the sealant layer (11) is in contact with the contents using the paper container laminate material (20) or the paper container laminate material (21), respectively. It is made of boxed products and maintains good initial quality such as the taste of the packed and packed contents. The form of the liquid paper container is not particularly limited, and for example, there is a flat top type or a govel top type rectangular liquid paper container.

本発明の紙容器用積層材料及びそれを用いた液体用紙容器を具体的な実施例を挙げて説明する。   The laminated material for paper containers of the present invention and the liquid paper container using the same will be described with reference to specific examples.

基材層(1)として、坪量400g/m2の板紙を使用し、ポリオレフィン系樹脂層(2)及び接着性樹脂層(3)の樹脂として、低密度ポリエチレン樹脂を使用し、ガスバリア層(4)として、厚さ12μmの二軸延伸ポリエステルフィルムの片面に厚さ50nmの酸化珪素薄膜層、ポリビニルアルコール樹脂を主成分とする厚さ0.5μmの乾燥皮膜からなるガスバリ性被膜層を積層したガスバリア性フィルムを使用し、接着剤層(5)として、ポリウレタン系接着剤を使用し、シーラント層(10)として、エチレン・環状オレフィンランダム共重合体樹脂層/ポリエチレン樹脂層=9/1(厚み比率)の総厚60μmの二層共押出フィルムを使用して、低密度ポリエチレン樹脂(20μm)/板紙(坪量400g/m2)/低密度ポリエチレン樹脂(30μm)/ガスバリア性フィルム/ポリウレタン系接着剤(乾燥塗布量5g/m2)/二層共押出フィルム(60μm)の構成の本発明の紙容器用積層材料(20)を作成した。前記紙容器用積層材料(20)を用いて紙容器製造機で内容量1000mlのゲーベルトップタイプの本発明の液体用紙容器を作成した。 A paperboard having a basis weight of 400 g / m 2 is used as the base material layer (1), a low density polyethylene resin is used as the resin of the polyolefin resin layer (2) and the adhesive resin layer (3), and a gas barrier layer ( 4) As a biaxially stretched polyester film having a thickness of 12 μm, a silicon oxide thin film layer having a thickness of 50 nm and a gas barrier coating layer made of a dry film having a thickness of 0.5 μm mainly composed of polyvinyl alcohol resin were laminated. A gas barrier film is used, a polyurethane adhesive is used as the adhesive layer (5), and an ethylene / cyclic olefin random copolymer resin layer / polyethylene resin layer = 9/1 (thickness) as the sealant layer (10). 2) co-extruded film with a total thickness of 60 μm, low density polyethylene resin (20 μm) / paperboard (basis weight 400 g / m 2 ) / low density polyester A laminated material (20) for paper containers according to the present invention having a constitution of a tylene resin (30 μm) / gas barrier film / polyurethane adhesive (dry coating amount 5 g / m 2 ) / double-layer coextruded film (60 μm) was prepared. Using the paper container laminate material (20), a paper container manufacturing machine produced a liquid paper container of the present invention having a capacity of 1000 ml and having a content of 1000 ml.

以下に、本発明の比較用の実施例について説明する。   Hereinafter, comparative examples of the present invention will be described.

シーラント層として、厚み60μmの低密度ポリエチレンフィルムを使用した以外は、実施例1と同様にして、比較用の紙容器用積層材料及びそれを用いた液体用紙容器を作成した。   A comparative paper container laminate material and a liquid paper container using the same were prepared in the same manner as in Example 1 except that a low-density polyethylene film having a thickness of 60 μm was used as the sealant layer.

〈評価〉
実施例1の本発明の液体用紙容器及び実施例2の比較用の液体用紙容器に蒸留水を充填、密封し、60℃で24時間保存後に、中の蒸留水の味覚の良否を評価した。その結果を表1に示す。
<Evaluation>
Distilled water was filled and sealed in the liquid paper container of the present invention of Example 1 and the liquid paper container for comparison of Example 2, and after storing at 60 ° C. for 24 hours, the quality of the distilled water inside was evaluated. The results are shown in Table 1.

Figure 0005560520
表1に示すように、実施例1の本発明の液体用紙容器に充填された蒸留水には接着剤由来の異味が含まれていなかった。一方、実施例2の比較用の液体用紙容器に充填された蒸留水には接着剤由来の異味が含まれていた。
Figure 0005560520
As shown in Table 1, the distilled water filled in the liquid paper container of the present invention of Example 1 did not contain the off-taste derived from the adhesive. On the other hand, the distilled water filled in the liquid paper container for comparison in Example 2 contained an off-flavor derived from the adhesive.

(a)は本発明の紙容器用積層材料の一実施形態を示す側断面図であり、(b)は紙容器用積層材料の他の実施形態を示す側断面図である。(A) is a sectional side view showing one embodiment of the laminated material for paper containers of the present invention, and (b) is a sectional side view showing another embodiment of the laminated material for paper containers.

符号の説明Explanation of symbols

1…基材層
2…ポリオレフィン系樹脂層
3…接着性樹脂層
4…ガスバリア層
5…接着剤層
6…環状オレフィン樹脂層
7,8…ポリエチレン樹脂層
10,11…シーラント層
20,21…紙容器用積層材料
DESCRIPTION OF SYMBOLS 1 ... Base material layer 2 ... Polyolefin-type resin layer 3 ... Adhesive resin layer 4 ... Gas barrier layer 5 ... Adhesive layer 6 ... Cyclic olefin resin layer 7, 8 ... Polyethylene resin layer 10, 11 ... Sealant layer 20, 21 ... Paper Laminate materials for containers

Claims (2)

板紙からなる基材層の一方の面にポリオレフィン系樹脂層を積層し、他方の面に少なくとも、低密度ポリエチレン、エチレン・アクリル酸共重合体、エチレン・メタクリル酸共重合体のいずれかからなる接着性樹脂層、ガスバリア層、接着剤層、シーラント層をこの順に積層した積層体からなる紙容器用積層材料において、
前記接着剤層は、水酸基を持った主剤とイソシアネート基を持った硬化剤とを2液混合して使用する2液混合型のポリウレタン系接着剤からなり、該シーラント層は少なくともポリエチレン樹脂層と、エチレン・環状オレフィンランダム共重合体、環状オレフィンの開環共重合体の水素化物樹脂、エチレン・環状オレフィンランダム共重合体のグラフト変性樹脂、環状オレフィンの開環共重合体のグラフト変性樹脂のいずれかからなる環状オレフィン樹脂層とからなり、内容物に接する面がポリエチレン樹脂層である多層共押出フィルムからなり、前記環状オレフィン層と前記ポリエチレン層の厚み比率が1/1〜9/1であることを特徴とする紙容器用積層材料。
Adhering a polyolefin resin layer on one side of a substrate layer made of paperboard and at least one of low-density polyethylene, ethylene / acrylic acid copolymer, and ethylene / methacrylic acid copolymer on the other side In a laminated material for a paper container comprising a laminate in which a functional resin layer, a gas barrier layer, an adhesive layer, and a sealant layer are laminated in this order,
The adhesive layer comprises a two-component mixed polyurethane adhesive that is used by mixing two main components having a hydroxyl group and a curing agent having an isocyanate group, and the sealant layer includes at least a polyethylene resin layer, Either ethylene / cyclic olefin random copolymer, cyclic olefin ring-opening copolymer hydride resin, ethylene / cyclic olefin random copolymer graft-modified resin, or cyclic olefin ring-opening copolymer graft-modified resin The surface of the cyclic olefin resin layer is made of a multilayer coextruded film whose surface in contact with the content is a polyethylene resin layer, and the thickness ratio of the cyclic olefin layer to the polyethylene layer is 1/1 to 9/1. A laminated material for paper containers.
板紙からなる基材層の一方の面にポリオレフィン系樹脂層を積層し、他方の面に少なくとも、低密度ポリエチレン、エチレン・アクリル酸共重合体、エチレン・メタクリル酸共重合体のいずれかからなる接着性樹脂層、ガスバリア層、接着剤層、シーラント層をこの順に積層した積層体からなる紙容器用積層材料において、
前記接着剤層は、水酸基を持った主剤とイソシアネート基を持った硬化剤とを2液混合して使用する2液混合型のポリウレタン系接着剤からなり、該シーラント層は少なくともポリエチレン樹脂層と、エチレン・環状オレフィンランダム共重合体、環状オレフィンの開環共重合体の水素化物樹脂、エチレン・環状オレフィンランダム共重合体のグラフト変性樹脂、環状オレフィンの開環共重合体のグラフト変性樹脂のいずれかからなる環状オレフィン樹脂層とからなり、前記シーラント層がポリエチレン樹脂層、環状オレフィン樹脂層、ポリエチレン樹脂層がこの順に三層共押出法によって積層されており、
ポリエチレン樹脂層、環状オレフィン樹脂層、ポリエチレン樹脂層の厚み比率が1/1/1〜3/1/3であることを特徴とする紙容器用積層材料。
Adhering a polyolefin resin layer on one side of a substrate layer made of paperboard and at least one of low-density polyethylene, ethylene / acrylic acid copolymer, and ethylene / methacrylic acid copolymer on the other side In a laminated material for a paper container comprising a laminate in which a functional resin layer, a gas barrier layer, an adhesive layer, and a sealant layer are laminated in this order,
The adhesive layer comprises a two-component mixed polyurethane adhesive that is used by mixing two main components having a hydroxyl group and a curing agent having an isocyanate group, and the sealant layer includes at least a polyethylene resin layer, Either ethylene / cyclic olefin random copolymer, cyclic olefin ring-opening copolymer hydride resin, ethylene / cyclic olefin random copolymer graft-modified resin, or cyclic olefin ring-opening copolymer graft-modified resin And the sealant layer is laminated by a three-layer coextrusion method in this order, a polyethylene resin layer, a cyclic olefin resin layer, and a polyethylene resin layer,
A laminated material for paper containers, wherein the polyethylene resin layer, the cyclic olefin resin layer, and the polyethylene resin layer have a thickness ratio of 1/1/1 to 3/1/3 .
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