WO2017069127A1 - 積層シート及び成形容器 - Google Patents
積層シート及び成形容器 Download PDFInfo
- Publication number
- WO2017069127A1 WO2017069127A1 PCT/JP2016/080876 JP2016080876W WO2017069127A1 WO 2017069127 A1 WO2017069127 A1 WO 2017069127A1 JP 2016080876 W JP2016080876 W JP 2016080876W WO 2017069127 A1 WO2017069127 A1 WO 2017069127A1
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- WIPO (PCT)
- Prior art keywords
- sheet
- biodegradable resin
- resin layer
- oxygen
- layer
- Prior art date
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Definitions
- the present invention relates to a laminated sheet, and more specifically, to a fully decomposable biodegradable barrier sheet and a container formed by thermoforming the same.
- plastic wastes In recent years, the increase in plastic waste has become a major social problem. Conventionally, many polymer materials have been developed and produced for the purpose of high performance and long-term stability, and thus are not easily decomposed in a natural environment. Therefore, how to dispose of and manage a large amount of plastic waste that is no longer needed is a global social problem.
- plastic wastes containers made of various synthetic resins such as polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate (PET), and polyvinyl chloride resins are particularly bulky. It is a problem.
- biodegradable plastics such as polylactic acid (PLA) can be used as a variety of packaging materials, but they have higher gas permeability than polyolefins, so products that deteriorate in the presence of oxygen. Not very suitable for packaging. Therefore, a material provided with functionality that suppresses the permeation of oxygen is required.
- PLA polylactic acid
- Patent Document 1 describes an article made of polylactic acid and an oxygen scavenger.
- the oxygen scavenger is selected from the following group.
- ⁇ Compound that can be oxidized and transition metal catalyst ⁇ Ethylenically unsaturated hydrocarbon and transition metal catalyst ⁇ Ascorbate ⁇ Isoascorbate ⁇ Sulphite ⁇ Ascorbate and transition metal catalyst (This catalyst consists of simple metal or salt) thing) ⁇ Transition metal compounds, complexes or chelates ⁇ Transition metal complexes or chelate tannins of polycarboxylic acid, salicylic acid or polyamine
- the shape of the article may be a film, a coating, a liner, or other forms.
- the oxygen scavenger is generally used for the purpose of creating a deoxygenated state in a sealed environment having a limited space. Therefore, there is a limit to the use of thermoforming to suppress oxygen permeation from the outside air.
- Patent Document 2 includes a biodegradable base material and reduced iron particles.
- the reduced iron particles are present at an appropriate concentration so as to absorb oxygen and to have a temperature higher than the deformation temperature when no iron particles are present.
- Biodegradable oxygen-absorbing plastics have been proposed that specify a concentration sufficient to reduce substantially.
- a multilayer laminated structure including a foil layer (foil layer), an adhesive layer, a PLA layer having an iron-based oxygen absorber, and a sealing material layer has been proposed, Those having this structure are easily expected not to have a complete decomposition type.
- the present invention has been made in view of the above circumstances, and has both excellent thermoformability and oxygen barrier properties, and changes into carbon dioxide and water by microbial decomposition (biodegradation) in composting. It aims at providing the laminated sheet which can be returned, and the container formed by thermoforming it.
- the laminated sheet of the present invention comprises an oxygen barrier resin layer and a biodegradable resin layer laminated on both surfaces of the oxygen barrier resin layer via an adhesive layer, and the mass percent total of the biodegradable resin layer Is 90% or more of the whole sheet, the mass percentage of each biodegradable resin layer is 10% or more of the whole sheet, and the oxygen permeability of the whole sheet is 10 cc / m 2 ⁇ day or less.
- the biodegradable resin constituting the biodegradable resin layer is polylactic acid, polybutylene succinate, polyhydroxybutyrate, polycaprolactone, polyhydroxyalkanoate, polyglycolic acid, modified polyvinyl alcohol. At least one selected from starch was used.
- the biodegradable resin is preferably polylactic acid. Further, in the above laminated sheet, the thickness of the entire sheet is 200 to 1300 ⁇ m, and the thickness of the oxygen barrier resin layer is 10 to 50 ⁇ m.
- the molded container of the present invention is formed by thermoforming the above various laminated sheets.
- the laminated sheet and the molded container of the present invention has excellent thermoformability and oxygen barrier properties, and is converted into carbon dioxide and water by microbial decomposition (biodegradation) in composting and returned to nature. It is possible.
- the laminated sheet of the present invention is a biodegradable resin that forms a skin layer on the outermost surface through an adhesive layer (11 a) on an oxygen barrier resin layer (12).
- a layer (10a) is laminated, and a biodegradable resin layer (10b) serving as a lower skin layer is laminated on the opposite side via an adhesive layer (11b).
- the total thickness of the sheet is 200 to 1300 ⁇ m, and the thickness of the oxygen barrier resin layer is 10 to 50 ⁇ m.
- the layer structure of the laminated sheet according to one embodiment of the present invention is a biodegradable resin layer / adhesive layer / oxygen barrier resin layer / adhesive layer / biodegradable resin layer, and is simply a skin.
- the lower skin layer may be newly provided with a layer that is finely pulverized or re-pelletized after heat melting and returned as a recycled product without discarding scrap generated in the process of producing the laminated sheet or molded container of the present invention. Good.
- a configuration may be adopted in which a printing surface is provided by a method such as direct printing or laminating printed films.
- the total thickness of the laminated sheet in the present invention is preferably 200 to 1300 ⁇ m. If the thickness of the container after thermoforming is less than 200 ⁇ m, a thin portion of the container is formed, and the content of the container on the inner surface of the container is reduced due to a decrease in container strength representing resistance to compression and pressure called buckling strength. There is a possibility that deformation or breakage of the container may occur due to vibration or compression when the object is stored and transported. On the other hand, if the thickness of the entire sheet exceeds 1300 ⁇ m, heat may not be sufficiently transmitted in the thickness direction of the sheet during thermoforming, and molding defects may occur.
- each raw material resin is melt-extruded using four or more single-screw or multi-screw extruders and laminated through a feed block and a T die.
- the method or the method of laminating using a multi-manifold die is mentioned.
- the biodegradable resin constituting the biodegradable resin layer of the present invention is selected from polylactic acid, polybutylene succinate, polyhydroxybutyrate, polycaprolactone, polyhydroxyalkanoate, polyglycolic acid, modified polyvinyl alcohol, and starch. 1 type may be used and what mixed 2 or more types chosen from these biodegradable resin may be used, and it does not specifically limit about the mixture ratio at the time of mixing 2 or more types. Moreover, when using 1 type chosen from these biodegradable resin, it is preferable to use general purpose polylactic acid especially.
- biodegradable resins have a low crystallization rate, so the degree of crystallization is increased for applications that require improved heat resistance, or the elasticity of the sheet tends to be difficult to achieve with only biodegradable resins.
- a modifier such as talc or ethylenebisstearic acid amide (EBS) may be added.
- the addition amount of these modifiers is preferably 0.1 to 30% with respect to the biodegradable resin in order to exert a great effect on the modification.
- the melt flow rate (Melt Flow Rate, hereinafter simply referred to as MFR) of the biodegradable resin described in the present invention is generally performed by a piston at the bottom of the cylinder under a constant temperature and load condition.
- a method of measuring the amount of resin extruded from a die having a specified diameter per 10 minutes is applied, and the measurement conditions in the present invention are a temperature setting of 190 ° C. and a load of 2.16 kgf.
- the MFR of the biodegradable resin described in the present invention is 1.0 to 20 g / 10 min. It is preferable that 1.0 g / 10 min. If it is less than this, the processability during sheet extrusion molding may be reduced. 20 g / 10 min. If it exceeds, the draw-down resistance that the sheet hangs down due to heating during extrusion molding or container molding may deteriorate and impact resistance may also decrease.
- oxygen barrier resin layer (12) examples include, but are not limited to, ethylene-vinyl alcohol copolymer resin, polyamide resin, polyvinyl alcohol, and polyvinylidene chloride. is not. Among these, ethylene-vinyl alcohol copolymer resin is preferable in terms of extrusion moldability.
- the ethylene-vinyl alcohol copolymer resin is usually obtained by saponifying an ethylene-vinyl acetate copolymer, and has an ethylene content of 10 to 65 mol in order to provide oxygen barrier properties and extrusion moldability. %, Preferably 20 to 50 mol%, and a saponification degree of 90% or more, preferably 95% or more.
- polyamide resin examples include lactam polymers such as caprolactam and laurolactam, polymers of aminocarboxylic acids such as 6-aminocaproic acid, 11-aminoundecanoic acid and 12-aminododecanoic acid, hexamethylenediamine, decamethylenediamine, Aliphatic diamines such as dodecamethylenediamine, 2,2,4- or 2,4,4-trimethylhexamethylenediamine, 1,3- or 1,4-bis (aminomethyl) cyclohexane, bis (p-aminocyclohexylmethane) ), Alicyclic diamines such as m- or p-xylylenediamine, diamine units such as aromatic diamines, aliphatic dicarboxylic acids such as adipic acid, suberic acid and sebacic acid, and alicyclics such as cyclohexanedicarboxylic acid Aromatic dicarboxylic acid, terephthalate
- polyamide resin examples include nylon 6, nylon 9, nylon 11, nylon 12, nylon 66, nylon 610, nylon 611, nylon 612, nylon 6T, nylon 6I, nylon MXD6, nylon 6/66, nylon 6 / 610, nylon 6 / 6T, nylon 6I / 6T, etc., among which nylon 6 and nylon MXD6 are preferred.
- the thickness of the oxygen barrier resin layer is preferably 10 to 50 ⁇ m, more preferably 20 to 40 ⁇ m. If the thickness is less than 10 ⁇ m, the thickness of the oxygen barrier resin layer in the container after thermoforming the sheet becomes extremely thin, so that the oxygen contained in the container can be prevented from deterioration due to oxidative degradation. There is a possibility that the barrier performance cannot be obtained, and when it exceeds 50 ⁇ m, there is a possibility that a so-called appearance defect called “hibari burr” occurs at the time of punching of the container applied after thermoforming.
- the oxygen permeability of the entire sheet is 10 cc / m 2 ⁇ day or less, more preferably 5 cc / m 2 ⁇ day or less. If the content exceeds 10 cc / m 2 ⁇ day, the function of suppressing the oxidative deterioration may not be sufficiently exhibited when the contents of the thermoformed container are oxidatively deteriorated.
- the resin constituting the adhesive layer is preferably a modified polyolefin polymer.
- the modified polyolefin polymer constituting the adhesive layer include ethylene, propylene, butene-1, 3-methylbutene-1, pentene-1, 4-methylpentene-1, hexene-1, octene-1, decene-1, etc.
- polyolefins having about 2 to 20 carbon atoms polyolefin resins such as vinyl acetate, vinyl chloride, acrylic acid, methacrylic acid, acrylic ester, methacrylic ester, copolymers with vinyl compounds such as polystyrene, ethylene -Polyolefin rubbers such as propylene copolymer, ethylene-propylene-diene copolymer, ethylene-butene-1 copolymer, propylene-butene-1 copolymer, acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid , Maleic acid, fumaric acid, itaconic acid, citraconic acid, tetrahydrophthalic acid Or unsaturated derivatives thereof such as acid halides, amides, imides, anhydrides, esters, and the like, specifically, maleyl chloride, maleimide, maleic anhydride, citraconic anhydride, monomethyl maleate, dimethyl maleate, Typical examples include
- modified polyolefin polymer among them, an ethylene resin, a propylene resin, or an ethylene-propylene or butene-1 copolymer rubber modified with an unsaturated dicarboxylic acid or an anhydride thereof, particularly maleic acid or an anhydride thereof is preferable. It is.
- the thickness of the modified polyolefin polymer layer is preferably 5 to 50 ⁇ m, more preferably 10 to 30 ⁇ m in any layer. If the thickness is less than 5 ⁇ m, sufficient adhesion strength between layers may not be obtained. If the thickness exceeds 50 ⁇ m, an appearance defect called so-called whirling may occur at the time of punching a container applied after thermoforming. There is sex.
- the molded container of the present invention is obtained by thermoforming the laminated sheet of the present invention.
- Thermoforming methods include general vacuum forming, pressure forming, and plug assist method in which plugs are formed by contacting a plug on one side of the sheet, and male and female molds that form a pair on both sides of the sheet. Examples of the method include so-called match mold molding, which is performed by bringing them into contact with each other, but is not limited thereto.
- a known sheet heating method such as radiant heating by an infrared heater or the like which is non-contact heating, or hot plate heating to soften the sheet by directly touching the heated hot plate is applied. can do.
- the molding temperature at the time of thermoforming is appropriately set in consideration of the melting point of the resin, etc., but if the sheet heating temperature is too low, the molded state of the container after thermoforming is insufficient, and conversely the sheet heating If the temperature is too high, there is a risk that a defect such as a fusing to the hot platen may occur, so it is preferable to set the temperature appropriately.
- the resin raw materials used in the examples are as follows.
- Biodegradable resin Polylactic acid "4032D” (NatureWorks, density: 1.24 g / cm3, MFR: 4.0 g / 10 min. (190 ° C, 2.16 kgf))
- Polylactic acid “GH501H” Manufactured by Hubei Gakko Co., Ltd., density: 1.24 g / cm 3, MFR: 4.5 g / 10 min. (190 ° C, 2.16 kgf)
- Polylactic acid “REVODE 190” (Made by Kaisei Biological Co., Ltd., density: 1.24 g / cm 3, MFR: 2.5 g / 10 min. (190 ° C, 2.16 kgf)) 4).
- Polybutylene succinate resin “FD92” Mitsubishi Chemical Corporation, density: 1.24 g / cm 3, MFR: 4.0 g / 10 min. (190 ° C, 2.16 kgf))
- Oxygen barrier resin ethylene-vinyl alcohol copolymer (EVOH) “EVAL J171B” Kerray Co., Ltd., density: 1.18 g / cm 3, MFR: 1.7 g / 10 min. (190 ° C, 2.16 kgf), ethylene content 32 mol%)
- Adhesive layer resin Modified polyester polymer "Primalloy GK320" Mitsubishi Chemical Corporation, density: 1.03 g / cm3, MFR: 10 g / 10 min.
- Modified polyolefin polymer Modified PO
- Modic F563 Mitsubishi Chemical Corporation, density: 1.03 g / cm 3, MFR: 3.0 g / 10 min. (190 ° C, 2.16 kgf)
- Example 1 By extrusion molding using a feed block, 1 polylactic acid “4032D” is used as the biodegradable resin for the skin layer and the lower skin layer, and 1 modified polyester polymer “Primalloy GK320” is used as the adhesive layer resin.
- Example 2 A multilayer laminated sheet similar to Example 1 was obtained except that the modified polyolefin polymer “Modic F563” 2 was used as the adhesive layer resin.
- Example 3 A multilayer laminated sheet similar to Example 1 was obtained except that 2 polylactic acid “GH501H” was used as the biodegradable resin for the skin layer and the lower skin layer.
- Example 4 A multilayer sheet similar to that of Example 1 was obtained except that 3 polylactic acid “REVODE 190” was used as a biodegradable resin for the skin layer and the lower skin layer.
- Example 5 As a biodegradable resin, a multilayer laminated sheet similar to Example 1 was obtained except that 95% by mass of polylactic acid “4032D” of resin 1 and 5% by mass of polybutylene succinate resin “FD92” of resin 4 were blended. .
- ⁇ Comparative Example 1> By extrusion molding using a feed block, polylactic acid “4032D” 1 is used as the biodegradable resin for the skin layer and the lower skin layer, and the biodegradable resin layer (10a) is 30 ⁇ m / adhesive layer (11a) is 15 ⁇ m / oxygen barrier.
- the resin layer (12) has a layer structure of 30 ⁇ m / adhesive layer (11b) / 15 ⁇ m / biodegradable resin layer (10b) and 110 ⁇ m, the total thickness is 200 ⁇ m, and the total mass percentage of the biodegradable resin layer is a sheet. A multilayer laminated sheet that was 72% of the total was obtained.
- the oxygen transmission rate of the entire sheet was measured by the following method.
- the oxygen transmission rate was measured before and after the charging in the following high temperature and high humidity environment.
- GB / T 1038 compliant Device used VAC-V1 manufactured by LabThink Measurement conditions: 23 ° C x 65% R.D. H.
- Sample setting Basically, in view of practicality after container molding, the sample is set in such a direction that oxygen can permeate from the lower skin layer side of the sheet sample.
- the biodegradability of the sheet was evaluated by the following method. [Change in mass of laminated sheet by soil burying test] Sheets were embedded in microbially active soil for 180 days, and the degree of degradation was determined by appearance observation, mass measurement, and the like. [Evaluation method of biodegradability] After storage for 180 days under composting conditions where the culture temperature was 58 ° C. ⁇ 2 ° C., biodegradability was evaluated by a method based on ISO14855. If the degree of decomposition is 90% or more, it is evaluated as complete decomposition. Table 1 summarizes the measurement results of oxygen permeability and the evaluation results of biodegradability for the laminated sheets of each Example and Comparative Example.
- polylactic acid was used as the biodegradable resin
- Example 5 a mixture of polylactic acid and polybutylene succinate was used as the biodegradable resin.
- the biodegradable resin was selected from polybutylene succinate, polyhydroxybutyrate, polycaprolactone, polyhydroxyalkanoate, polyglycolic acid, modified polyvinyl alcohol, and starch. It may be used, or a mixture of two or more selected from polylactic acid, polybutylene succinate, polyhydroxybutyrate, polycaprolactone, polyhydroxyalkanoate, polyglycolic acid, modified polyvinyl alcohol, and starch is used. May be. In this case, the same effects as in the above embodiments can be obtained.
- thermoforming a multilayer sheet composed of the constituent resins described in the examples of the present invention it has excellent thermoformability and oxygen barrier properties, and carbon dioxide and biodegradation by composting. It becomes possible to provide a fully degradable biodegradable barrier sheet that can be changed into water and returned to nature, and a container formed by thermoforming the same.
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- Engineering & Computer Science (AREA)
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- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Laminated Bodies (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Biological Depolymerization Polymers (AREA)
Abstract
Description
・酸化し得る化合物と遷移金属触媒
・エチレン系不飽和炭化水素と遷移金属触媒
・アスコルビン酸塩
・イソアスコルビン酸塩
・亜硫酸塩
・アスコルビン酸塩と遷移金属触媒(この触媒は単純金属または塩からなるもの)
・遷移金属の化合物、錯体またはキレート
・ポリカルボン酸、サリチル酸またはポリアミンの遷移金属錯体またはキレート
・タンニン
また、物品の形状は、フィルム、被覆、ライナー、その他の形態であってよいとしている。
しかし、特許文献1で提案されているPLAと酸素捕捉剤から成る物品について、酸素捕捉剤とは限られた空間を持つ密閉環境の中で脱酸素状態を作り出す目的で使用されるものが一般的であり、熱成形して外気からの酸素透過を抑制するような用途には限界がある。
しかしながら、特許文献2に記載の構成としては、フォイル層(箔層)、接着剤層、鉄ベースの酸素吸収剤を有するPLA層、および封止材層から成る多層積層構造が提案されており、当該構造を有するものは完全分解型の分解度を有さないことが容易に予想される。
また、上記の積層シートでは、前記生分解性樹脂層を構成する生分解性樹脂がポリ乳酸、ポリブチレンサクシネート、ポリヒドロキシブチレート、ポリカプロラクトン、ポリヒドロキシアルカノエート、ポリグリコール酸、変性ポリビニルアルコール、澱粉から選ばれる少なくとも1種を用いた。
また、上記の積層シートでは、前記生分解性樹脂がポリ乳酸を用いることが好ましい。
さらに、上記の積層シートでは、 シート全体の厚みが200~1300μmであり、酸素バリア性樹脂層の厚みが10~50μmである。
一方、本発明の成形容器は、上記の各種積層シートを熱成形してなる。
<積層シート>
本発明の一実施形態に係る積層シートの層構成は、前述の通り、生分解性樹脂層/接着層/酸素バリア性樹脂層/接着層/生分解性樹脂層であり、簡素的には表皮層/接着層/酸素バリア層/接着層/下皮層との表記とする。下皮層には、本発明の積層シートや成形容器を製造する工程で発生するスクラップを廃棄することなく、細かく粉砕、若しくは熱溶融後にリペレット化して再生品として戻す層を新たに設けた構成としてもよい。
生分解性樹脂層の厚みとしては、シート全体に対して生分解性樹脂層の質量パーセント合計がシート全体の90%以上とするような構成であれば、表皮層と下皮層とを同じ厚みとした上下対称型としても異なる厚みとした上下非対称型としても、どちらでもよい。上下非対称型の場合、特に深絞りの容器成形を行う際の薄肉化による構成層の断裂や破断を防ぐために、個々の生分解性樹脂層の質量パーセントがシート全体の10%以上であることが好ましい。
酸素バリア性樹脂層を構成する酸素バリア性樹脂としては、例えば、エチレン-ビニルアルコール共重合体樹脂、ポリアミド樹脂、ポリビニルアルコール、ポリ塩化ビニリデンが代表的なものとして挙げられるがこれらに限定されるものではない。その中でも、押出成形性の面でエチレン-ビニルアルコール共重合体樹脂が好ましい。
接着層を構成する樹脂としては、変性ポリオレフィン系重合体が好ましい。接着層を構成する変性ポリオレフィン系重合体としては、エチレン、プロピレン、ブテン-1、3-メチルブテン-1、ペンテン-1、4-メチルペンテン-1、ヘキセン-1、オクテン-1、デセン-1等の炭素数2~20程度の他のポリオレフィンや酢酸ビニル、塩化ビニル、アクリル酸、メタクリル酸、アクリル酸エステル、メタクリル酸エステル、ポリスチレン等のビニル化合物との共重合体等のポリオレフィン系樹脂や、エチレン-プロピレン共重合体、エチレン-プロピレン-ジエン共重合体、エチレン-ブテン-1共重合体、プロピレン-ブテン-1共重合体等のポリオレフィン系ゴムを、アクリル酸、メタクリル酸、クロトン酸、イソクロトン酸、マレイン酸、フマル酸、イタコン酸、シトラコン酸、テトラヒドロフタル酸等の不飽和カルボン酸、または、その酸ハライド、アミド、イミド、無水物、エステル等の誘導体、具体的には、塩化マレニル、マレイミド、無水マレイン酸、無水シトラコン酸、マレイン酸モノメチル、マレイン酸ジメチル、マレイン酸グリシジル等でグラフト反応条件下に変性したものが代表的なものとして挙げられる。
本発明の成形容器は、本発明の積層シートを熱成形してなる。熱成形方法としては、一般的な真空成形、圧空成形や、これらの応用として、シートの片面にプラグを接触させて成形を行うプラグアシスト法、また、シートの両面に一対をなす雄雌型を接触させて成形を行う、いわゆるマッチモールド成形と称される方法等が挙げられるが、これらに限定されるものではない。また、成形前にシートを加熱軟化させる方法として非接触加熱である赤外線ヒーター等による輻射加熱やシートを加熱された熱盤に直接触れさせて軟化させる熱盤加熱等、公知のシート加熱方法を適用することができる。
以下、実施例及び比較例を挙げて本発明をより具体的に説明するが、本発明は実施例等の内容に何ら限定されるものではない。
(1)生分解性樹脂
1.ポリ乳酸 「4032D」
(NatureWorks社製、密度:1.24g/cm3、
MFR:4.0g/10min.(190℃、2.16kgf))
2.ポリ乳酸 「GH501H」
(湖北合光社製、密度:1.24g/cm3、MFR:4.5g/10min.
(190℃、2.16kgf))
3.ポリ乳酸 「REVODE 190」
(海正生物社製、密度:1.24g/cm3、MFR:2.5g/10min.
(190℃、2.16kgf))
4.ポリブチレンサクシネート樹脂 「FD92」
(三菱化学社製、密度:1.24g/cm3、MFR:4.0g/10min.
(190℃、2.16kgf))
(2)酸素バリア性樹脂
エチレン-ビニルアルコール共重合体(EVOH) 「エバールJ171B」
(クラレ社製、密度:1.18g/cm3、MFR:1.7g/10min.
(190℃、2.16kgf)、エチレン含量32mol%)
(3)接着層用樹脂
1.変性ポリエステル系重合体 「プリマロイGK320」
(三菱化学社製、密度:1.03g/cm3、MFR:10g/10min.
(230℃、2.16kgf))
2.変性ポリオレフィン系重合体(変性PO) 「モディックF563」
(三菱化学社製、密度:1.03g/cm3、MFR:3.0g/10min.
(190℃、2.16kgf))
フィードブロックを用いた押出成形加工により、表皮層と下皮層に生分解性樹脂として1のポリ乳酸「4032D」を用い、接着層用樹脂として1の変性ポリエステル系重合体「プリマロイGK320」を用い、生分解性樹脂層(10a)140μm/接着層(11a)15μm/酸素バリア性樹脂層(12)30μm/接着層(11b)15μm/生分解性樹脂層(10b)700μmとなる層構成を有し、総厚が900μmであり、生分解性樹脂層の質量パーセントがシート全体の94%となる多層の積層シートを得た。
接着層用樹脂として2の変性ポリオレフィン系重合体「モディックF563」を用いた以外は実施例1と同様の多層の積層シートを得た。
表皮層と下皮層に生分解性樹脂として2のポリ乳酸「GH501H」を用いた以外は実施例1と同様の多層の積層シートを得た。
表皮層と下皮層に生分解性樹脂として3のポリ乳酸「REVODE 190」を用いた以外は実施例1と同様の多層シートを得た。
生分解性樹脂として、樹脂1のポリ乳酸「4032D」95質量パーセントと樹脂4のポリブチレンサクシネート樹脂「FD92」5質量パーセントをブレンドする以外は実施例1と同様の多層の積層シートを得た。
フィードブロックを用いた押出成形加工により、表皮層と下皮層に生分解性樹脂として1のポリ乳酸「4032D」を用い、生分解性樹脂層(10a)30μm/接着層(11a)15μm/酸素バリア性樹脂層(12)30μm/接着層(11b)15μm/生分解性樹脂層(10b)110μmとなる層構成を有し、総厚が200μmであり、生分解性樹脂層の質量パーセント合計がシート全体の72%となる多層の積層シートを得た。
1台の単軸押出機を用い生分解性樹脂として1のポリ乳酸「4032D」を用いて総厚が700μmの単層シートを得た。
シート全体の酸素透過率を、以下の方法にて測定した。酸素透過率測定は、以下の高温高湿環境下への投入前後で測定を行った。
[測定方法] GB/T 1038準拠
使用機器:LabThink社製 VAC-V1
測定条件:23℃×65%R.H.
サンプルセット:基本的に、容器成形後の実用性を鑑みて、シートサンプルの下皮層側から酸素が透過するような向きにサンプルをセットする。
[土壌埋設試験による積層シートの質量変化]
微生物活性な土壌にシートを180日間埋設し、外観観察、質量測定などにより分解度とした。
[生分解性の評価方法]
培養温度は58℃±2℃としたコンポスト条件下に180日間保管した後、ISO14855に準拠する方法にて生分解性を評価した。なお、分解度が90%以上であれば、完全分解として評価される。
各実施例及び比較例の積層シートに対する酸素透過率の測定および生分解性の評価結果を表1にまとめている。
なお、上記実施例1~4では、生分解性樹脂としてポリ乳酸を用い、実施例5では、生分解性樹脂としてポリ乳酸とポリブチレンサクシネートを混合したものを用いたが、特にこれらに限定されず、上記実施例1~4では、生分解性樹脂としてポリブチレンサクシネート、ポリヒドロキシブチレート、ポリカプロラクトン、ポリヒドロキシアルカノエート、ポリグリコール酸、変性ポリビニルアルコール、澱粉から選択された1種を用いても良いし、又はポリ乳酸、ポリブチレンサクシネート、ポリヒドロキシブチレート、ポリカプロラクトン、ポリヒドロキシアルカノエート、ポリグリコール酸、変性ポリビニルアルコール、澱粉から選択された2種以上を混合したものを用いてもよい。この場合、上記各実施例と同じ効果を得ることができる。
10b 生分解性樹脂層
11a 接着層
11b 接着層
12 酸素バリア性樹脂層
Claims (5)
- 酸素バリア性樹脂層と、当該酸素バリア性樹脂層の両面に接着層を介してそれぞれ積層される生分解性樹脂層とを備え、前記生分解性樹脂層の質量パーセント合計がシート全体の90%以上であるとともに、個々の生分解性樹脂層の質量パーセントがシート全体の10%以上であり、且つシート全体の酸素透過率が10cc/m2・day以下であることを特徴とする積層シート。
- 前記生分解性樹脂層を構成する生分解性樹脂がポリ乳酸、ポリブチレンサクシネート、ポリヒドロキシブチレート、ポリカプロラクトン、ポリヒドロキシアルカノエート、ポリグリコール酸、変性ポリビニルアルコール、澱粉から選ばれる少なくとも1種を用いたことを特徴とする請求項1に記載の積層シート。
- 前記生分解性樹脂がポリ乳酸を用いたことを特徴とする請求項2に記載の積層シート。
- シート全体の厚みが200~1300μmであり、酸素バリア性樹脂層の厚みが10~50μmであることを特徴とする請求項1から3のいずれか一項に記載の積層シート。
- 請求項1から4のいずれか一項に記載の積層シートを熱成形してなる成形容器。
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US15/769,091 US20180304573A1 (en) | 2015-10-19 | 2016-10-18 | Laminated sheet and formed container |
JP2017546554A JP6996978B2 (ja) | 2015-10-19 | 2016-10-18 | 積層シート及び成形容器 |
EP16857441.6A EP3366470A4 (en) | 2015-10-19 | 2016-10-18 | LAMINATE SHEET AND FORMED CONTAINER |
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CN201510677358.2A CN106585017A (zh) | 2015-10-19 | 2015-10-19 | 层叠片材和成形容器 |
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EP (1) | EP3366470A4 (ja) |
JP (1) | JP6996978B2 (ja) |
CN (1) | CN106585017A (ja) |
TW (1) | TWI781086B (ja) |
WO (1) | WO2017069127A1 (ja) |
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WO2019189745A1 (ja) | 2018-03-30 | 2019-10-03 | 三菱ケミカル株式会社 | 生分解性積層体 |
JP2019181877A (ja) * | 2018-04-16 | 2019-10-24 | 三菱ケミカル株式会社 | 積層体及びコーヒーカプセル、食品容器、化粧品容器 |
WO2020067543A1 (ja) * | 2018-09-28 | 2020-04-02 | 三菱ケミカル株式会社 | 樹脂組成物、成形品、及び樹脂組成物の製造方法 |
WO2020194198A1 (ja) | 2019-03-28 | 2020-10-01 | 積水化成品工業株式会社 | 積層発泡シート |
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DE112021004264T5 (de) * | 2020-08-12 | 2023-05-25 | Kuraray Co., Ltd. | Vinylalkoholpolymer und dessen Verwendung |
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KR20230065588A (ko) * | 2021-11-05 | 2023-05-12 | 에스케이마이크로웍스 주식회사 | 다층 배리어 필름, 이의 제조방법 및 이를 포함하는 포장재 |
KR102662486B1 (ko) * | 2022-02-25 | 2024-05-03 | 에스케이마이크로웍스 주식회사 | 다층 배리어 필름 및 이를 포함하는 포장재료 |
KR102670616B1 (ko) * | 2022-02-25 | 2024-05-31 | 에스케이마이크로웍스 주식회사 | 다층 배리어 필름 및 이를 포함하는 포장재료 |
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KR102493718B1 (ko) | 2017-10-04 | 2023-01-30 | 닛폰세이시가부시키가이샤 | 배리어 소재 |
JP7468852B2 (ja) | 2017-10-04 | 2024-04-16 | 日本製紙株式会社 | バリア素材 |
JP7157069B2 (ja) | 2017-10-04 | 2022-10-19 | 日本製紙株式会社 | バリア素材 |
KR20200061347A (ko) * | 2017-10-04 | 2020-06-02 | 닛폰세이시가부시키가이샤 | 배리어 소재 |
JPWO2019069963A1 (ja) * | 2017-10-04 | 2020-09-10 | 日本製紙株式会社 | バリア素材 |
WO2019069963A1 (ja) * | 2017-10-04 | 2019-04-11 | 日本製紙株式会社 | バリア素材 |
JP2020157757A (ja) * | 2017-10-04 | 2020-10-01 | 日本製紙株式会社 | バリア素材 |
US11504952B2 (en) | 2017-10-04 | 2022-11-22 | Nippon Paper Industries Co., Ltd. | Barrier material |
WO2019189745A1 (ja) | 2018-03-30 | 2019-10-03 | 三菱ケミカル株式会社 | 生分解性積層体 |
JP2019181877A (ja) * | 2018-04-16 | 2019-10-24 | 三菱ケミカル株式会社 | 積層体及びコーヒーカプセル、食品容器、化粧品容器 |
JP7361456B2 (ja) | 2018-04-16 | 2023-10-16 | 三菱ケミカル株式会社 | 積層体及びコーヒーカプセル、食品容器、化粧品容器 |
WO2020067543A1 (ja) * | 2018-09-28 | 2020-04-02 | 三菱ケミカル株式会社 | 樹脂組成物、成形品、及び樹脂組成物の製造方法 |
JP7359138B2 (ja) | 2018-09-28 | 2023-10-11 | 三菱ケミカル株式会社 | 樹脂組成物、成形品、及び樹脂組成物の製造方法 |
JPWO2020067543A1 (ja) * | 2018-09-28 | 2021-09-02 | 三菱ケミカル株式会社 | 樹脂組成物、成形品、及び樹脂組成物の製造方法 |
WO2020194198A1 (ja) | 2019-03-28 | 2020-10-01 | 積水化成品工業株式会社 | 積層発泡シート |
US11981787B2 (en) | 2019-03-28 | 2024-05-14 | Sekisui Kasei Co., Ltd. | Laminated foam sheet |
JP7520996B2 (ja) | 2020-10-16 | 2024-07-23 | デンカ株式会社 | 多層樹脂シート及び成形容器 |
WO2022080238A1 (ja) * | 2020-10-16 | 2022-04-21 | デンカ株式会社 | 多層樹脂シート及び成形容器 |
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TW201722727A (zh) | 2017-07-01 |
EP3366470A4 (en) | 2019-05-08 |
JPWO2017069127A1 (ja) | 2018-08-02 |
TWI781086B (zh) | 2022-10-21 |
CN106585017A (zh) | 2017-04-26 |
EP3366470A1 (en) | 2018-08-29 |
JP6996978B2 (ja) | 2022-01-17 |
US20180304573A1 (en) | 2018-10-25 |
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