JP6721773B1 - Packaging laminate and packaging - Google Patents

Packaging laminate and packaging Download PDF

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JP6721773B1
JP6721773B1 JP2019173334A JP2019173334A JP6721773B1 JP 6721773 B1 JP6721773 B1 JP 6721773B1 JP 2019173334 A JP2019173334 A JP 2019173334A JP 2019173334 A JP2019173334 A JP 2019173334A JP 6721773 B1 JP6721773 B1 JP 6721773B1
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density polyethylene
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井上 雄次
雄次 井上
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Fukusuke Kogyo Co Ltd
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Abstract

【課題】植物由来ポリエチレンを用いることで環境負荷の低減を図りつつ、実用レベルの物性を備えた包装用積層体を提供することを目的とする。【解決手段】坪量が10g/m2以上、100g/m2未満の紙基材3と、紙基材3の少なくとも一面に積層された樹脂層2とを備え、樹脂層2を構成する樹脂組成物7は、植物由来エチレンを含むモノマーを重合してなる植物由来低密度ポリエチレンを含めて複数の低密度ポリエチレンを含有し、かつ、樹脂組成物7に含まれる各ポリマーについて測定したMFRを基に算出した樹脂組成物7のMFR計算値が、7.2g/10min以下である構成とする。【選択図】図1PROBLEM TO BE SOLVED: To provide a packaging laminate having physical properties at a practical level while reducing environmental load by using plant-derived polyethylene. SOLUTION: A resin composition which comprises a paper base material 3 having a basis weight of 10 g/m2 or more and less than 100 g/m2 and a resin layer 2 laminated on at least one surface of the paper base material 3, and which constitutes the resin layer 2. 7 contains a plurality of low-density polyethylene including a plant-derived low-density polyethylene obtained by polymerizing a monomer containing a plant-derived ethylene, and is calculated based on the MFR measured for each polymer contained in the resin composition 7. The resin composition 7 has a calculated MFR value of 7.2 g/10 min or less. [Selection diagram] Figure 1

Description

本発明は、紙基材と、前記紙基材上に積層された樹脂層を備えた包装用積層体に関し、特に、厚みの薄い紙基材に植物由来低密度ポリエチレンを含有する樹脂組成物を積層した包装用積層体及びそれを用いた包装体に関する。 The present invention relates to a packaging laminate provided with a paper base material and a resin layer laminated on the paper base material, and in particular, a resin composition containing a plant-derived low-density polyethylene in a thin paper base material. The present invention relates to a laminated packaging laminate and a package using the same.

現在、油分や水分を含んだ惣菜、パン等の包装体の材料として、紙基材にポリエチレンを積層した積層体が多用されている。ポリエチレンとしては柔軟性及びヒートシール性に優れるという観点から低密度ポリエチレンが多用されている。一方、地球温暖化を抑制する観点から、世界規模で二酸化炭素の排出量の削減が求められており、近年、石油を炭素源とするエチレン(石油由来エチレン)を含んだポリエチレン(石油由来ポリエチレン)の代替品として、植物を炭素源とするエチレン(植物由来エチレン)を含んだポリエチレン(植物由来ポリエチレン)が上市されている。 At present, a laminated body in which polyethylene is laminated on a paper base material is often used as a material for packaging bodies such as prepared foods and bread containing oil and water. As polyethylene, low density polyethylene is often used from the viewpoint of excellent flexibility and heat sealability. On the other hand, from the viewpoint of curbing global warming, reduction of carbon dioxide emissions is required on a global scale, and in recent years, polyethylene (petroleum-derived polyethylene) containing ethylene (petroleum-derived ethylene) with petroleum as a carbon source has been demanded. As a substitute for the above, polyethylene (plant-derived polyethylene) containing ethylene (plant-derived ethylene) having a plant as a carbon source is marketed.

そして、特許文献1には、坪量100〜700g/m2の紙基材と、植物由来ポリエチレンと、石油由来ポリエチレンとを含んでなるバイオマスポリオレフィン樹脂層とを有する積層体を備えた包装製品(紙カップ又は液体用紙容器)が開示されており、植物の生育時のCO2吸収と燃焼時の排出が同一となるカーボンニュートラルなポリオレフィン樹脂フィルムを実現できる旨記載されている。 Then, in Patent Document 1, a packaged product provided with a laminate having a paper base material having a basis weight of 100 to 700 g/m 2 , a biomass polyolefin resin layer containing plant-derived polyethylene, and petroleum-derived polyethylene ( (Paper cup or liquid paper container) is disclosed, and it is described that a carbon-neutral polyolefin resin film having the same CO 2 absorption during plant growth and the same emission during combustion can be realized.

特開2016−27171号公報JP, 2016-27171, A

しかしながら、植物由来ポリエチレンを構成するモノマーである植物由来エチレンは、植物原料を含む培養液に微生物を作用させて産生する発酵エタノールを脱水することによって製造される。このようにして得られた植物由来エチレンには極微量の不純物が含まれることから、これをモノマーとして重合してなる植物由来ポリエチレンは、同じグレードであっても石油由来ポリエチレンと同等の物性とするのが難しいことが知られている(特許文献1段落0058参照)。 However, plant-derived ethylene, which is a monomer that constitutes plant-derived polyethylene, is produced by dehydrating fermented ethanol produced by allowing a microorganism to act on a culture solution containing plant raw materials. Since the plant-derived ethylene thus obtained contains a very small amount of impurities, the plant-derived polyethylene obtained by polymerizing it with a monomer has the same physical properties as the petroleum-derived polyethylene even in the same grade. It is known that this is difficult (see paragraph 0058 of Patent Document 1).

実際に、本願発明者が検討したところ、紙基材上に樹脂層が積層された包装用積層体において、樹脂層を構成する樹脂組成物中の石油由来低密度ポリエチレンを植物由来低密度ポリエチレンに代替した場合、樹脂組成物の物性が変化することが確認された。そして、樹脂層のヒートシール性が低下するなどの不都合が生じることがわかった。 In fact, the inventors of the present application have studied, and in a packaging laminate in which a resin layer is laminated on a paper base material, the petroleum-derived low-density polyethylene in the resin composition constituting the resin layer is converted into a plant-derived low-density polyethylene. It was confirmed that the physical properties of the resin composition were changed when it was substituted. Then, it was found that the heat sealability of the resin layer is deteriorated.

そこで、本発明においては、植物由来ポリエチレンを用いることで環境負荷の低減を図りつつ、実用レベルの物性を備えた包装用積層体を提供することを目的とする。 Therefore, it is an object of the present invention to provide a packaging laminate having physical properties at a practical level while reducing environmental load by using plant-derived polyethylene.

上記課題を解決するために、本発明の一態様としての包装用積層体は、坪量が10g/m2以上、100g/m2未満の紙基材と、前記紙基材の少なくとも一面に積層された樹脂層とを備え、前記樹脂層を構成する樹脂組成物は、植物由来エチレンを含むモノマーを重合してなる植物由来低密度ポリエチレンを含めて複数の低密度ポリエチレンを含有し、かつ、前記樹脂組成物に含まれる各ポリマーについて測定したMFRを基に算出した前記樹脂組成物のMFR計算値が、7.2g/10min以下である。 In order to solve the above problems, a packaging laminate according to one embodiment of the present invention has a paper base material having a basis weight of 10 g/m 2 or more and less than 100 g/m 2, and is laminated on at least one surface of the paper base material. And a resin composition that constitutes the resin layer contains a plurality of low-density polyethylene including a plant-derived low-density polyethylene obtained by polymerizing a monomer containing a plant-derived ethylene, and, The calculated MFR of the resin composition calculated based on the MFR measured for each polymer contained in the resin composition is 7.2 g/10 min or less.

また、前記樹脂組成物は、植物由来エチレンを含むモノマーを重合してなる植物由来低密度ポリエチレンを複数含有し、かつ、前記樹脂組成物に含まれる各ポリマーについて測定したMFRを基に算出した前記樹脂組成物のMFR計算値が4.9g/10min以上、7.2g/10min以下となるようにしてもよい。 Further, the resin composition contains a plurality of plant-derived low density polyethylene obtained by polymerizing a monomer containing plant-derived ethylene, and calculated based on MFR measured for each polymer contained in the resin composition The calculated MFR value of the resin composition may be 4.9 g/10 min or more and 7.2 g/10 min or less.

また、前記樹脂組成物は、植物由来エチレンを含むモノマーを重合してなる植物由来低密度ポリエチレンと、石油由来エチレンを含むモノマーを重合してなる石油由来低密度ポリエチレンとを含有し、かつ、前記樹脂組成物に含まれる各ポリマーについて測定したMFRを基に算出した前記樹脂組成物のMFR計算値が、3.4g/10min超、7.2g/10min以下となるようにしてもよい。 The resin composition contains a plant-derived low-density polyethylene obtained by polymerizing a monomer containing plant-derived ethylene, and a petroleum-derived low-density polyethylene obtained by polymerizing a monomer containing petroleum-derived ethylene, and The MFR calculated value of the resin composition calculated based on the MFR measured for each polymer contained in the resin composition may be more than 3.4 g/10 min and 7.2 g/10 min or less.

前記包装用積層体はヒートシールして包装体を構成してもよい。 The packaging laminate may be heat-sealed to form a packaging body.

前記包装用積層体の製造方法として、前記樹脂組成物を押出成形により前記紙基材に積層するようにしてもよい。 As a method for producing the packaging laminate, the resin composition may be laminated on the paper base material by extrusion molding.

上記態様によれば、紙基材に樹脂層が積層された包装用積層体において、樹脂層を構成する樹脂組成物として、植物由来低密度ポリエチレンを含めて複数の低密度ポリエチレンを含有し、かつ、前記樹脂組成物に含まれる各ポリマーについて測定したMFRを基に算出した前記樹脂組成物のMFR計算値が、7.2g/10min以下になるようにしたため、樹脂層のヒートシール性の低下を抑制することができ、環境負荷の低減を図りつつ、実用レベルの物性を備えた包装用積層体を提供することが可能となる。 According to the above aspect, in the packaging laminate in which the resin layer is laminated on the paper base material, the resin composition forming the resin layer contains a plurality of low-density polyethylene including a plant-derived low-density polyethylene, and Since the MFR calculated value of the resin composition calculated based on the MFR measured for each polymer contained in the resin composition is set to 7.2 g/10 min or less, the heat sealability of the resin layer is reduced. Therefore, it is possible to provide a packaging laminate having physical properties at a practical level while suppressing the environmental load.

本発明の包装用積層体を示す断面図Sectional drawing which shows the laminated body for packaging of this invention. 本発明の包装用積層体の製造装置を示す概略図Schematic showing the manufacturing apparatus of the packaging laminate of the present invention

以下、本発明の実施形態について図面を基に説明する。図1は本実施形態における包装用積層体を示す断面図である。図示のごとく、包装用積層体1は、樹脂層2と、基材3とが積層された構造を有する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the packaging laminate in the present embodiment. As shown, the packaging laminate 1 has a structure in which a resin layer 2 and a base material 3 are laminated.

図2は、本実施形態の包装用積層体の製造装置の一例を示す概略図である。本実施形態では、押出成形法を用いて包装用積層体1を製造している。具体的には、包装用積層体1の製造装置は、図示しない押出機に接続されたTダイ4と、圧着ロール5と、冷却ロール6とを備える。 FIG. 2 is a schematic view showing an example of an apparatus for manufacturing a packaging laminate according to this embodiment. In this embodiment, the packaging laminate 1 is manufactured using an extrusion molding method. Specifically, the manufacturing apparatus for the packaging laminate 1 includes a T die 4, which is connected to an extruder (not shown), a pressure roll 5, and a cooling roll 6.

包装用積層体1を製造する手順としては、押出機で加熱溶融してTダイ4からフィルム状に押出された樹脂組成物7を、基材3の表面に塗布する。溶融状態の樹脂組成物7が塗布された基材3は、圧着ロール5と冷却ロール6の間を通過することで、樹脂層2が圧着された状態で冷却され、包装用積層体1が得られる。 As a procedure for manufacturing the packaging laminate 1, the resin composition 7 that is heated and melted by an extruder and extruded in a film form from the T die 4 is applied to the surface of the base material 3. The substrate 3 coated with the molten resin composition 7 passes between the pressure roll 5 and the cooling roll 6 to be cooled while the resin layer 2 is pressure-bonded, and the packaging laminate 1 is obtained. To be

本発明で使用される紙基材3の坪量は、10g/m2以上、100g/m2未満である。すなわち、本発明の紙基材3は、紙パック、紙コップ、紙容器等に用いられる紙基材に比べて厚みが薄く、柔軟性を有する。したがって、包装用積層体1は、紙基材3に積層される樹脂組成物の性状の影響を受けやすくなる。よって、本発明の包装用積層体1に適した樹脂組成物の調製が必要となる。 The basis weight of the paper base material 3 used in the present invention is 10 g/m 2 or more and less than 100 g/m 2 . That is, the paper base material 3 of the present invention is thinner and more flexible than paper base materials used for paper packs, paper cups, paper containers and the like. Therefore, the packaging laminate 1 is easily affected by the properties of the resin composition laminated on the paper base material 3. Therefore, it is necessary to prepare a resin composition suitable for the packaging laminate 1 of the present invention.

樹脂層2を構成する樹脂組成物としては、複数の低密度ポリエチレンを含有する。そして、そのうちの少なくとも1種類は、植物由来低密度ポリエチレンとされる。さらに、樹脂組成物に含まれる各ポリマーについて測定したMFRを基に算出した前記樹脂組成物のMFR計算値が、7.2g/10min以下とされる。 The resin composition forming the resin layer 2 contains a plurality of low density polyethylenes. At least one of them is a plant-derived low density polyethylene. Furthermore, the MFR calculated value of the resin composition calculated based on the MFR measured for each polymer contained in the resin composition is set to 7.2 g/10 min or less.

本発明において、MFRは、メルトフローレートの略であり、JIS K7210に準拠して加熱温度190℃にて測定した値を意味する。また、本発明において、MFR計算値とは、以下の(式1)で得られる値を意味する。
MFR計算値=W1×MFR1+…+Wn×MFRn ・・・(式1)
ここで、
MFR1:樹脂組成物中の第1のポリマーのMFR測定値
MFRn:樹脂組成物中の第nのポリマーのMFR測定値
1 :樹脂組成物に含まれるポリマー全体に対する第1のポリマーの質量割合
n :樹脂組成物に含まれるポリマー全体に対する第nのポリマーの質量割合
(ただし、W1+…+Wn=1)
In the present invention, MFR is an abbreviation for melt flow rate and means a value measured at a heating temperature of 190° C. according to JIS K7210. Further, in the present invention, the MFR calculated value means the value obtained by the following (Formula 1).
MFR calculated value=W 1 ×MFR 1 +...+W n ×MFR n (Equation 1)
here,
MFR 1 : MFR measurement value of the first polymer in the resin composition MFR n : MFR measurement value of the nth polymer in the resin composition W 1 : Mass of the first polymer with respect to the entire polymer contained in the resin composition Ratio W n : Mass ratio of the n-th polymer to the whole polymer contained in the resin composition (however, W 1 +... +W n =1)

上記樹脂組成物のMFR計算値を7.2g/10min以下とすることにより、樹脂層のヒートシール性を良好に維持することが可能となる。したがって、包装用積層体の樹脂層同士をヒートシールして形成した包装体は、良好なヒートシール性を備える。低密度ポリエチレンとしては、少なくとも一部に植物由来ポリエチレンを含有していればよい。モノマーの一部を植物由来エチレンとすることによっても環境負荷を低減することが可能となる。 By setting the calculated MFR of the above resin composition to 7.2 g/10 min or less, it becomes possible to maintain the heat sealability of the resin layer in a good condition. Therefore, the package formed by heat-sealing the resin layers of the packaging laminate has good heat-sealing property. The low-density polyethylene may contain at least part of plant-derived polyethylene. It is also possible to reduce the environmental load by using plant-derived ethylene as a part of the monomer.

植物由来ポリエチレン中の全炭素量に対する植物由来の炭素の割合は、バイオマス度と呼ばれ、ポリエチレン樹脂中に含まれる14Cの濃度を測定することによって求めることができる。すなわち、大気中には一定割合の14Cが含まれる一方、石油由来の樹脂の炭素には14Cが含まれていない。 The ratio of plant-derived carbon to the total amount of carbon in the plant-derived polyethylene is called the biomass degree and can be determined by measuring the concentration of 14 C contained in the polyethylene resin. That is, while a fixed proportion of 14 C is contained in the atmosphere, carbon of the resin derived from petroleum does not contain 14 C.

したがって、ポリエチレン系樹脂中に含まれる14Cの濃度を測定することでバイオマス度を求めることができる。具体的に、ポリエチレン系樹脂中の炭素が全て石油由来である場合にはバイオマス度は0%となり、ポリエチレン系樹脂中の炭素が全て植物由来である場合にはバイオマス度は100%となる。 Therefore, the biomass degree can be obtained by measuring the concentration of 14 C contained in the polyethylene resin. Specifically, the biomass degree is 0% when all the carbon in the polyethylene resin is derived from petroleum, and the biomass degree is 100% when all the carbon in the polyethylene resin is derived from the plant.

上記樹脂組成物には、本発明の目的を損なわない範囲で、一般的に用いられている充填剤、着色剤、潤滑剤、帯電防止剤、紫外線吸収剤、可塑剤、酸化防止剤などの安定剤、染料、顔料などの着色剤、スリップ剤(SL剤)およびアンチブロック剤などの添加剤を配合することができる。 The above-mentioned resin composition contains, in a range that does not impair the object of the present invention, a stabilizer such as a filler, a colorant, a lubricant, an antistatic agent, an ultraviolet absorber, a plasticizer, and an antioxidant which are commonly used. Additives such as agents, dyes, colorants such as pigments, slip agents (SL agents) and antiblock agents can be added.

本実施例では、低密度ポリエチレンとして、植物由来低密度ポリエチレンおよび石油由来低密度ポリエチレンを用い、これらを種々組み合わせて樹脂組成物を調製した。調整した樹脂組成物は、押出機によって紙基材上に積層して包装用積層体を作製し、包装用積層体の成形性及び物性について評価した。以下、その詳細について記す。 In this example, plant-derived low-density polyethylene and petroleum-derived low-density polyethylene were used as the low-density polyethylene, and various combinations of these were used to prepare a resin composition. The prepared resin composition was laminated on a paper substrate by an extruder to prepare a packaging laminate, and the moldability and physical properties of the packaging laminate were evaluated. The details will be described below.

[樹脂組成物の調製]
樹脂組成物の調製に用いた樹脂及びスリップ剤(SL剤)の詳細を表1に示す。なお、ポリエチレンとして、1種類の石油由来低密度ポリエチレン(石油由来LDと略する)、2種類の植物由来低密度ポリエチレン(植物由来LDと略する)及び1種類の植物由来直鎖状低密度ポリエチレン(植物由来LLDと略する)を用いた。
[Preparation of resin composition]
Details of the resin and the slip agent (SL agent) used for the preparation of the resin composition are shown in Table 1. As polyethylene, one kind of petroleum-derived low-density polyethylene (abbreviated as petroleum-derived LD), two kinds of plant-derived low-density polyethylene (abbreviated as plant-derived LD) and one kind of plant-derived linear low-density polyethylene (Abbreviated as plant-derived LLD) was used.

Figure 0006721773
Figure 0006721773

[包装用積層体の作製及び評価]
(1)樹脂組成物のポリエチレンとして植物由来ポリエチレンのみを配合した場合
樹脂組成物のポリエチレン成分として植物由来ポリエチレンのみ配合して包装用積層体を作製した(表2のNo.1〜6)。比較材として、石油由来LD単体を紙基材に積層した包装用積層体(現行品)を作製して相対評価を行なった(表2のNo.7)。
[Production and evaluation of packaging laminate]
(1) When only plant-derived polyethylene was blended as the polyethylene of the resin composition Only the plant-derived polyethylene was blended as the polyethylene component of the resin composition to prepare a packaging laminate (Nos. 1 to 6 in Table 2). As a comparative material, a packaging laminate (current product) in which a simple substance derived from petroleum LD was laminated on a paper substrate was prepared and subjected to relative evaluation (No. 7 in Table 2).

具体的には、紙基材として坪量37g/m2の耐油紙を使用し、そこへ押出機より押出した樹脂組成物を塗布して厚み14μmの樹脂層を積層した。包装用積層体作製時における加工性及び樹脂圧、さらに、作製した包装用積層体のヒートシール性について評価を行った。評価結果を表2に記す。 Specifically, an oil resistant paper having a basis weight of 37 g/m 2 was used as a paper base material, and the resin composition extruded from the extruder was applied thereto to laminate a resin layer having a thickness of 14 μm. The processability and resin pressure during the production of the packaging laminate, and the heat-sealing property of the produced packaging laminate were evaluated. The evaluation results are shown in Table 2.

Figure 0006721773
Figure 0006721773

(2)樹脂組成物のポリエチレンとして植物由来LDと石油由来LDを併用した場合
樹脂組成物のポリエチレンとして植物由来LDと石油由来LDとを併用して包装用積層体を作製した(表3のNo.9〜12)。比較材として、石油由来LD単体を紙基材に積層した包装用積層体を作製して相対評価を行なった(表3のNo.13)。なお、表3のNo.13と、表2のNo.7とは樹脂組成物は同配合であるが、紙基材の種類、樹脂層厚み及び押出機が異なる。
(2) When vegetable-derived LD and petroleum-derived LD are used in combination as polyethylene of the resin composition A vegetable-derived LD and petroleum-derived LD are used in combination as polyethylene of the resin composition to prepare a packaging laminate (No in Table 3). 9-12). As a comparison material, a packaging laminate in which a simple substance derived from petroleum LD was laminated on a paper base material was subjected to relative evaluation (No. 13 in Table 3). In Table 3, No. 13 and No. 3 in Table 2. 7 has the same composition as the resin composition, but differs in the type of paper base material, the resin layer thickness and the extruder.

具体的には、紙基材として坪量40g/m2の耐油紙を使用し、そこへ押出機より押出した樹脂組成物を塗布して厚み15μmの樹脂層を積層した。なお、No.1〜7の作製に用いた押出機と、No.8〜13の作製に用いた押出機とは別の押出機を使用した。包装用積層体作製時における加工性及び樹脂圧、さらに、作製した包装用積層体のヒートシール性について評価を行なった。評価結果を表3に記す。 Specifically, oil-resistant paper having a basis weight of 40 g/m 2 was used as a paper base material, and a resin composition extruded from an extruder was applied thereto to laminate a resin layer having a thickness of 15 μm. An extruder different from the extruder used for producing Nos. 1 to 7 and the extruder used for producing Nos. 8 to 13 was used. The processability and the resin pressure during the production of the packaging laminate, and the heat sealing properties of the produced packaging laminate were evaluated. The evaluation results are shown in Table 3.

Figure 0006721773
Figure 0006721773

(3)包装用積層体作製時の樹脂圧
包装用積層体作製時に樹脂組成物を押出機から押出す際の樹脂圧を測定し、以下の基準により評価した。
〇:No.7(又はNo.13)の樹脂圧の1.5倍以内の圧力である。
△:No.7(又はNo.13)の樹脂圧の1.5倍を超える圧力である。
×:樹脂圧が高すぎて押出し不可。
(3) Resin pressure during production of packaging laminate The resin pressure during extrusion of the resin composition from the extruder during production of the packaging laminate was measured and evaluated according to the following criteria.
◯: No. The pressure is within 1.5 times the resin pressure of No. 7 (or No. 13).
Δ: No. The pressure exceeds 1.5 times the resin pressure of No. 7 (or No. 13).
X: The resin pressure is too high to extrude.

(4)包装用積層体作製時の加工性
包装用積層体作製時に押出機から押出される樹脂組成物の状態及び包装用積層体の外観を目視により観察し、以下の基準により評価した。なお、下記基準において、樹脂揺れとはTダイから押し出された膜状の樹脂組成物の幅が一定でなく、不安定に増減する現象をいう。
〇:樹脂組成物に樹脂揺れがなく、得られた包装用積層体は平坦なシート状である。
×:樹脂組成物に樹脂揺れが認められ、得られた包装用積層体が波打った状態である。
−:樹脂組成物が押出し不可により包装用積層体を作製できない。
(4) Workability during the production of the packaging laminate The state of the resin composition extruded from the extruder during the production of the packaging laminate and the appearance of the packaging laminate were visually observed and evaluated according to the following criteria. In the following criteria, the resin shake means a phenomenon that the width of the film-shaped resin composition extruded from the T-die is not constant, and increases and decreases unstablely.
◯: The resin composition has no resin shaking, and the obtained packaging laminate has a flat sheet shape.
X: Resin sway was observed in the resin composition, and the obtained packaging laminate was wavy.
-: A packaging laminate cannot be prepared because the resin composition cannot be extruded.

(5)包装用積層体のシール強度
長さ200mm、幅15mmの短冊状にカットした包装用積層体片一対を樹脂層が接触するようにして重ね合わせ、短冊の一端部を幅方向にヒートシールした。なお、ヒートシール領域は短冊の長さ方向5mm×幅方向15mmとした。ヒートシール条件は、シール温度150℃、シール時間1sec、シール圧力0.2MPaとした。ヒートシールした短冊の他端部を引張試験機にセットして引張り、最大強度を測定した。n=5で測定し、その平均値をシール強度とした。No.7(又はNo.13)のシール強度に対し、シール強度低下率が10%未満の場合は実用レベルであると判定した。
(5) Sealing strength of the packaging laminate A pair of packaging laminate pieces cut into a strip shape having a length of 200 mm and a width of 15 mm are overlapped so that the resin layers contact each other, and one end of the strip is heat-sealed in the width direction. did. The heat-sealing area was 5 mm in the length direction of the strip and 15 mm in the width direction. The heat sealing conditions were a sealing temperature of 150° C., a sealing time of 1 sec, and a sealing pressure of 0.2 MPa. The other end of the heat-sealed strip was set in a tensile tester and pulled to measure the maximum strength. The measurement was performed at n=5, and the average value was taken as the seal strength. With respect to the seal strength of No. 7 (or No. 13), when the reduction rate of the seal strength was less than 10%, it was judged to be a practical level.

[評価結果]
表2、3より、樹脂組成物として、植物由来LDを含む複数の低密度ポリエチレンを含有し、かつ、樹脂組成物のMFR計算値が7.2g/10min以下であるNo.2、4及び5並びにNo.9〜12のシール強度は、比較材であるNo.7又は13のシール強度に比べてシール強度の低下率が10%未満であり、十分実用レベルであった。
[Evaluation results]
From Tables 2 and 3, the resin composition containing a plurality of low-density polyethylene containing plant-derived LD and having an MFR calculated value of the resin composition of 7.2 g/10 min or less. 2, 4 and 5 and No. The seal strength of Nos. 9 to 12 is No. The decrease rate of the seal strength was less than 10% as compared with the seal strength of 7 or 13, which was a sufficiently practical level.

なお、No.6については実機レベルの試験で樹脂揺れが発生し、適切にシール強度の試験を行なうことができなかった。ただ、少量スケール試験では、No.6の加工性に問題はなく、シール強度も比較材(No.7)のシール強度に比べて低下率が10%未満のレベルを維持することが確認された。 In addition, No. With respect to No. 6, the resin swayed in the actual machine level test, and the seal strength test could not be properly performed. However, in the small scale test, No. It was confirmed that there was no problem in the workability of No. 6 and the seal strength maintained the level of the reduction rate of less than 10% as compared with the seal strength of the comparative material (No. 7).

上述のごとく、樹脂組成物を構成する低密度ポリエチレンとして、植物由来LDにさらに別の植物由来LDを混合するか、石油由来LDを混合し、樹脂組成物のMFR計算値を7.2g/10min以下にすることで、環境負荷の低減を図りつつ、実用レベルの物性を備えた包装用積層体を提供することができる。なお、植物由来LDに植物由来LLDを混合したNo.3は、MFR計算値が6.3g/10minであるにもかかわらず樹脂圧が高くなりすぎて包装用積層体を作製できないという結果となった。 As described above, as the low-density polyethylene constituting the resin composition, a plant-derived LD is mixed with another plant-derived LD, or a petroleum-derived LD is mixed, and the calculated MFR value of the resin composition is 7.2 g/10 min. By the following, it is possible to provide a packaging laminate having physical properties at a practical level while reducing the environmental load. In addition, plant-derived LD was mixed with plant-derived LLD. The result of No. 3 was that the resin pressure became too high and the packaging laminate could not be prepared even though the calculated MFR value was 6.3 g/10 min.

表2に示すように、樹脂組成物中に複数の植物由来LDを含む場合、MFR計算値を4.9g/10min以上とすることで樹脂揺れの発生を抑制することができ、平坦なシート状の包装用積層体を得ることができる。この場合、MFR計算値は6.0g/10min以上とするのが好ましい。これにより、樹脂圧の上昇を抑えることができ、よりスムーズに樹脂層を積層することが可能となる。 As shown in Table 2, when the resin composition contains a plurality of plant-derived LDs, the occurrence of resin shaking can be suppressed by setting the MFR calculated value to 4.9 g/10 min or more, and a flat sheet shape can be obtained. Can be obtained. In this case, the calculated MFR value is preferably 6.0 g/10 min or more. As a result, the rise in resin pressure can be suppressed, and the resin layers can be laminated more smoothly.

一方、表3に示すように、樹脂組成物中に植物由来LDと石油由来LDを含む場合は、MFR計算値が3.4g/10min超、7.2g/10min以下の範囲で良好なシール強度を維持可能である。ただ、環境負荷の低減を図る観点から植物由来LDは樹脂組成物のポリエチレン成分として5質量%以上含むことが好ましい。すなわち、L420、95質量%及びSBC818、5質量%を含む樹脂組成物のMFR計算値3.6g/10min以上であることが好ましい。 On the other hand, as shown in Table 3, when the resin composition contains a plant-derived LD and a petroleum-derived LD, the MFR calculated value is in the range of more than 3.4 g/10 min and 7.2 g/10 min or less. Can be maintained. However, from the viewpoint of reducing the environmental load, it is preferable that the plant-derived LD is contained in an amount of 5% by mass or more as a polyethylene component of the resin composition. That is, the MFR calculated value of the resin composition containing L420, 95 mass% and SBC818, 5 mass% is preferably 3.6 g/10 min or more.

表2より、樹脂組成物を構成する低密度ポリエチレンとして、現行品の石油由来LDと同等のMFRを有するSPB681を100%使用したNo.6は、現行品のNo.7に比べて樹脂圧が高く、樹脂組成物押出し時に樹脂揺れが発生した。これにより、包装用積層体の樹脂層に厚みムラが発生し、樹脂層厚が薄い部分では樹脂層が紙基材から浮く現象が認められた。また、作製した包装用積層体は波打った状態となり、実用レベルでないことが確認された。 From Table 2, No. 1 using 100% SPB681 having an MFR equivalent to that of the current petroleum-derived LD was used as the low-density polyethylene constituting the resin composition. No. 6 of the current product. The resin pressure was higher than that of No. 7, and resin sway occurred when the resin composition was extruded. As a result, unevenness in the thickness of the resin layer of the packaging laminate occurred, and the phenomenon in which the resin layer floats from the paper base material in the portion where the resin layer thickness is thin was observed. Further, it was confirmed that the produced packaging laminate was in a wavy state and was not at a practical level.

一方、植物由来LDとして、SPB681に比べてMFR値の大きいSBC818を100%使用したNo.1は、樹脂圧および加工性とも問題は認められなかったものの、シール強度が現行品であるNo.7よりも19%低下し、実用レベルでないことが確認された。 On the other hand, as plant-derived LD, SBC818 having a larger MFR value than SPB681 was used in 100%. No. 1 was the current product, although no problem was found in resin pressure and workability. It was 19% lower than 7 and it was confirmed that it was not at a practical level.

以上、本発明の実施形態につき説明したが、本発明の範囲はこれに限定されるものではなく、発明の趣旨を逸脱しない範囲で種々の変更を加えて実施することができる。本実施形態では、樹脂組成物を構成するポリエチレンとして、植物由来LDにさらに別の植物由来LDを混合するか、石油由来LDを混合した系について説明したが、これに限らず、たとえば、上記系の樹脂組成物にさらに別の低密度ポリエチレンを配合することも可能である。さらに、包装用積層体の物性を阻害しない範囲で低密度ポリエチレン以外のポリエチレン(高密度ポリエチレン、中密度ポリエチレン、直鎖状低密度ポリエチレン)を少量配合することもできる。 Although the embodiment of the present invention has been described above, the scope of the present invention is not limited to this, and various modifications may be made without departing from the spirit of the invention. In the present embodiment, as polyethylene constituting the resin composition, a system in which another plant-derived LD is mixed with a plant-derived LD or a petroleum-derived LD is mixed is described, but the present invention is not limited to this, and, for example, the above-mentioned system. It is also possible to mix another low-density polyethylene with the resin composition. Furthermore, a small amount of polyethylene (high-density polyethylene, medium-density polyethylene, linear low-density polyethylene) other than low-density polyethylene can be blended within a range that does not impair the physical properties of the packaging laminate.

1 包装用積層体
2 樹脂層
3 紙基材
4 Tダイ
5 圧着ロール
6 冷却ロール
7 樹脂組成物
1 Packaging Laminate 2 Resin Layer 3 Paper Base Material 4 T Die 5 Pressure Roll 6 Cooling Roll 7 Resin Composition

Claims (5)

坪量が10g/m2以上、100g/m2未満の紙基材と、前記紙基材の少なくとも一面に積層された樹脂層とを備え、前記樹脂層を構成する樹脂組成物は、植物由来エチレンを含むモノマーを重合してなる植物由来低密度ポリエチレンを含めて複数の低密度ポリエチレンを含有し、かつ、前記樹脂組成物に含まれる各ポリマーについて測定したMFRを基に算出した前記樹脂組成物のMFR計算値が、7.2g/10min以下である包装用積層体。 A resin composition comprising a paper base material having a basis weight of 10 g/m 2 or more and less than 100 g/m 2 and a resin layer laminated on at least one surface of the paper base material is a plant-derived resin composition. The resin composition containing a plurality of low-density polyethylene including a plant-derived low-density polyethylene obtained by polymerizing a monomer containing ethylene, and calculated based on the MFR measured for each polymer contained in the resin composition The laminated body for packaging whose MFR calculated value is 7.2 g/10 min or less. 前記樹脂組成物は、植物由来エチレンを含むモノマーを重合してなる植物由来低密度ポリエチレンを複数含有し、かつ、前記樹脂組成物に含まれる各ポリマーについて測定したMFRを基に算出した前記樹脂組成物のMFR計算値が、4.9g/10min以上、7.2g/10min以下である請求項1に記載の包装用積層体。 The resin composition contains a plurality of plant-derived low-density polyethylene obtained by polymerizing a monomer containing plant-derived ethylene, and the resin composition calculated based on the MFR measured for each polymer contained in the resin composition The packaging laminate according to claim 1, wherein the calculated MFR value of the product is 4.9 g/10 min or more and 7.2 g/10 min or less. 前記樹脂組成物は、植物由来エチレンを含むモノマーを重合してなる植物由来低密度ポリエチレンと、石油由来エチレンを含むモノマーを重合してなる石油由来低密度ポリエチレンとを含有し、かつ、前記樹脂組成物に含まれる各ポリマーについて測定したMFRを基に算出した前記樹脂組成物のMFR計算値が、3.4g/10min超、7.2g/10min以下である請求項1に包装用積層体。 The resin composition contains a plant-derived low-density polyethylene obtained by polymerizing a monomer containing a plant-derived ethylene, and a petroleum-derived low-density polyethylene obtained by polymerizing a monomer containing a petroleum-derived ethylene, and the resin composition The laminate for packaging according to claim 1, wherein the calculated MFR value of the resin composition calculated based on the MFR measured for each polymer contained in the product is more than 3.4 g/10 min and 7.2 g/10 min or less. 請求項1〜3のいずれか一項に記載の包装用積層体をヒートシールしてなる包装体。 A package obtained by heat-sealing the packaging laminate according to any one of claims 1 to 3. 請求項1〜3のいずれか一項に記載の包装用積層体の製造方法であって、前記樹脂組成物を押出成形により前記紙基材に積層する包装用積層体の製造方法。 The method for manufacturing a packaging laminate according to any one of claims 1 to 3, wherein the resin composition is laminated on the paper base material by extrusion molding.
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