JP2004155078A - Manufacturing method for resin composition for food packaging and laminate for packaging - Google Patents

Manufacturing method for resin composition for food packaging and laminate for packaging Download PDF

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Publication number
JP2004155078A
JP2004155078A JP2002323526A JP2002323526A JP2004155078A JP 2004155078 A JP2004155078 A JP 2004155078A JP 2002323526 A JP2002323526 A JP 2002323526A JP 2002323526 A JP2002323526 A JP 2002323526A JP 2004155078 A JP2004155078 A JP 2004155078A
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Japan
Prior art keywords
layered silicate
polyolefin
resin composition
layered
food packaging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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JP2002323526A
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Japanese (ja)
Inventor
Yoshio Omoto
義夫 大元
Hiroaki Ogita
弘明 荻田
Norio Kobayashi
紀夫 小林
Frisk Peter
フリスク ペーター
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Nihon Tetra Pak KK
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Nihon Tetra Pak KK
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Publication date
Application filed by Nihon Tetra Pak KK filed Critical Nihon Tetra Pak KK
Priority to JP2002323526A priority Critical patent/JP2004155078A/en
Publication of JP2004155078A publication Critical patent/JP2004155078A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a resin composition for food packaging which uses no chemical substance causing a problem of food hygiene and so secures safety, wherein a layered silicate can be dispersed uniformly with ease and which is excellent in barrier properties, and a laminate for packaging. <P>SOLUTION: Regarding the resin composition containing the minute layered silicate dispersed uniformly substantially in polyolefin and the laminate for food packaging, the material of the layered silicate is prepared and filled in a solid-phase shearing kneader, together with the polyolefin, and kneading is performed in a solid-phase state, while the layered silicate is peeled minutely in a layered state. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
本発明は、食品包装用樹脂組成物の製造法及び包装用積層体に関する。
【0002】
【従来の技術】
食品包装用樹脂組成物は、積層体の構成層として食品包装に使用されている。食品包装用バリア性積層体として用いられるとき、食品包装用樹脂組成物、例えば、ポリオレフィン、ポリアミド等のポリマーのガスバリヤー性を改良する方法として、層状珪酸塩(いわゆる、クレイ、粘土類)または層間イオンを有機オニウムイオンでイオン交換した層状珪酸塩をポリアミド樹脂中に分散し複合化する方法がある。
その粘土は、その大部分が結晶であり、岩石の中の雲母などと基本的に同じ整然とした層状構造をもった含水ケイ酸塩鉱物を主体とする。その化学成分は、主にケイ酸・アルミナ・水でこのほかにFe.Mg.Ca.Na.Kなどが含まれている。粘土中に微粒の鉱物として広く含まれる層状粘土鉱物は、カオリン鉱物、雲母粘土鉱物、スメクタイト(モンモリロナイト)の三種類及び混合層鉱物と呼ばれる種類である。
【0003】
一般的に、ポリオレフィンなどの無極性の樹脂では、特に、膨潤化していない粘土類を微小に層状に剥離するすることが難しい。
そこで、容易にバリア性を付与する為の複合化の手法は、大きく二種類に分けられる。ポリマーに層状珪酸塩を均一に分散させる方法は、膨潤化剤と接触させて、予め層間を拡げて層間にモノマーを取り込みやすくしたのち、モノマーと混合し、重合する方法(特開昭48−103653号公報、特公昭58−35542号公報、特開昭62−74957号公報参照)、膨潤化剤に高分子化合物を用い、予め層間を100Å以上に拡げて、ポリマーと層状珪酸塩をポリマーの溶融温度以上の温度条件下で、二軸押出機等を使用して機械的剪断力により層状珪酸塩を分散させる方法(溶融混合法)(特公昭58−35542号公報、特開昭47−36686号公報参照)である。
【発明が解決しようとする課題】
【0004】
しかしながら、重合する上記方法では、重合装置自体の改造が必要になり、大規模かつ高価になる。上記溶融混合法で製造した層状珪酸塩/ポリマー複合化フィルムでは、層状珪酸塩の分散自体も充分でなく、フィルム表面に凹凸等が現れ、フィルム外観や透明性を著しく損なうという他にも、機械的性質が低下するという欠点も有している。
しかも、得られた樹脂組成物は、バリア性が必ずしも良好ではなく、食品用包装に用いる場合、食品衛生上、添加する膨潤化剤が問題になることもある。
【0005】
本発明は、食品衛生上問題になる添加剤の膨潤化剤を用いず安全であり、簡易に層状珪酸塩を均一に分散することができ、バリア性に優れた食品包装用樹脂組成物の製造法及び包装用積層体を提供することを目的とする。
【0006】
【課題を解決するための手段】
この課題を解決するために本発明は、ポリオレフィン中に実質的に均一に分散している微小な層状珪酸塩を含有する樹脂組成物及び食品包装用積層体に関し、層状珪酸塩原料を調製し、層状珪酸塩原料をポリオレフィンと共に、固相せん断混練機に充填し、固相状態で層状珪酸塩を微小に層状に剥離しながら混練することを特徴とする。
上記発明によって、食品衛生上問題になる化学物質を用いず安全であり、簡易に層状珪酸塩を均一に分散することができ、バリア性に優れた食品包装用樹脂組成物の製造法及び包装用積層体を実現することができる。
【0007】
【発明の実施の形態】
本発明の請求項1に記載の食品包装用樹脂組成物の製造法の発明は、ポリオレフィン中に実質的に均一に分散している微小な層状珪酸塩を含有する樹脂組成物の製造法であって、層状珪酸塩原料を調製し、その層状珪酸塩原料をポリオレフィンと共に、固相せん断混練機に充填し、固相状態で層状珪酸塩を微小に層状に剥離しながら混練することを特徴とする。
この発明において、固相状態で層状珪酸塩原料とポリオレフィンとが、せん断混練されるので、ポリオレフィン中に実質的に均一に分散している微小な層状珪酸塩を含有する樹脂組成物を得ることでき、このような樹脂組成物は優れたガスバリア性という作用を有する。
【0008】
請求項1に記載の発明は、必要に応じて、固相せん断混練工程の前に、層状珪酸塩原料とポリオレフィンとを、二軸混練押出機で予備混練すること、また、固相せん断混練工程の後に、層状珪酸塩原料とポリオレフィンとの混練物を、二軸混練押出機で混練することができる。
この態様によって、混練で、固相せん断混練機によるせん断必要エネルギーを低減でき、また、後工程の処理を容易にするという作用を有する。
【0009】
請求項2に記載の発明は、ポリオレフィンが低いメルトフローレート及び/又は高い密度を有する粉状ポリエチレンであるという特徴を有する。
この発明によって、固相せん断混練機によるせん断必要エネルギーを低減でき、しかも、層状珪酸塩をより微小で均一に層状に剥離し、均一に分散するという作用を有する。
【0010】
請求項3に記載の発明は、層状珪酸塩原料が化学的変性されていない天然若しくは合成の層状珪酸塩からなるいう特徴を有する。
この発明によって、食品衛生上問題になる膨潤化剤など添加剤を用いていないので、その化学成分が内容物に漏れ出す恐れが無く、食品衛生上安全であるという作用を有する。
【0011】
請求項4に記載の発明は、ポリオレフィン中に実質的に均一に分散している微小な層状珪酸塩を含有するバリア層を含む積層体であって、そのバリア層が、該層状珪酸塩原料をポリオレフィンと共に固相せん断混練機に充填して、固相状態で層状珪酸塩を微小に層状に剥離しながら混練することによって得られた樹脂組成物であることを特徴とする食品包装用積層体である。
この発明において、固相状態で層状珪酸塩原料とポリオレフィンとが、せん断混練され、ポリオレフィン中に実質的に均一に分散している微小な層状珪酸塩を含有する樹脂組成物のバリア層が構成されているので、優れたガスバリア性という作用を有する。
【0012】
以下、本発明の実施の形態について、詳細に説明する。
本発明で使用されるポリオレフィンは、ポリエチレン及びポリプロピレンなどの単独重合のポリオレフィン、そのポリオレフィンとのコポリマー、ポリオレフィンとのブンレンドポリマーなどである。
ポリエチレンを用いた場合は、ポリエチレンとしては、包装としてヒートシール性が要求されることから、低密度ポリエチレン(LDPE)や直鎖状低密度ポリエチレン(LLDPE)、メタロセンPEを用いる。また、中密度ポリエチレン(MDPE)や高密度ポリエチレン(HDPE)を用いても良い。
【0013】
層状珪酸塩の原料としては、珪酸マグネシウムまたは珪酸アルミニウムの層から構成される層状フィロ珪酸鉱物を例示することができる。具体的には、1:1型層状珪酸塩、即ち、カオリナイト、ディッカイト、ハロイサイト、アンチゴナイト、クリソタイル等や、2:1型層状珪酸塩、即ち、モンモリロナイト、ヘクトライト、フッ素ヘクトライト、サポナイト、バイデライト、スブチンサイト、バーミキュライト等のスメクタイト類、白雲母、金雲母等の雲母類、フッ素金雲母、フッ素白雲母、K型フッ素テニオライト、K型四珪素雲母等の膨潤性合成雲母等、Li型フッ素テニオライト、Na型フッ素テニオライト、Na型四珪素フッ素雲母等の膨潤性合成フッ素雲母、マーガライト、パイロフィライト、タルク、緑泥石等などが挙げられる。表面外観、製品着色、ガスバリヤー性の観点から、中でもモンモリロナイト、ヘクトライト、フッ素ヘクトライト、膨潤性合成フッ素雲母等が好ましい。
【0014】
本発明の好ましい態様において、Na、K、Li及びCaを除く金属イオン(例えば、Ag、Zn、Co、Cd、Cuから選ばれた金属イオン)又はその金属化合物を層間に有する層状珪酸塩(粘土鉱物)を用いることができる。この層状珪酸塩自体が、緑膿菌、大腸菌、黄色ブドウ球菌などの種々の微生物に対して優れた抗菌性を備える。従って、この層状珪酸塩を含有するバリア層にもこの抗菌性が、更に本発明による包装積層体にも、抗菌性が付与される。
層状珪酸塩の配合量は、ポリオレフィンに対して、酸素バリア性、ストレスに対する耐久性、保香及び品質保持性などの改良効果などを考慮して、適宜、選択・変更できる。
【0015】
この発明において、ポリオレフィンに層状珪酸塩を均一に分散させる方法は、まず、層状珪酸塩原料を調製し、その層状珪酸塩原料をポリオレフィンと共に、固相せん断混練機に充填し、固相状態で層状珪酸塩を微小に層状に剥離しながら混練する。この混練工程により、ポリオレフィン中に実質的に均一に分散している微小な層状珪酸塩を含有する樹脂組成物を得る。
固相せん断混練機は、ポリオレフィンを層状珪酸塩と、溶融状態ではなく、室温の固相状態で混合する。従って、この固相状態混練による混練効果は溶融混練に比べて非常に高い。固相せん断混練中、高いせん断力がポリオレフィンと層状珪酸塩とに生じ、容易な層状剥離に導く。これは、化学的に変性した層状珪酸塩を用いなければ、層状剥離が難しいことを示しているが、食品衛生上、化学的変性層状珪酸塩の使用は忌避されるべきである。この発明では、上述の問題を解決することができる。
【0016】
この発明の好ましい態様において、固相せん断混練工程の前に、層状珪酸塩原料とポリオレフィンとを、二軸混練押出機で予備混練すること、また、固相せん断混練工程の後に、層状珪酸塩原料とポリオレフィンとの混練物を、二軸混練押出機で混練することができる。
この発明の更に好ましい態様において、ポリオレフィンが低いメルトフローレート及び/又は高い密度を有する粉状ポリエチレンである。
この発明の好ましい態様において、層状珪酸塩原料が化学的変性されていない天然若しくは合成の層状珪酸塩からなる。
【0017】
【実施例】
実施例及び比較例を参照して、この発明をより具体的に説明する。
ポリオレフィンに層状珪酸塩を均一に分散させる方法は、まず、層状珪酸塩原料を調製し、その層状珪酸塩原料をポリオレフィンと共に、固相せん断混練機に充填し、固相状態で層状珪酸塩を微小に層状に剥離しながら混練する。
【0018】
(実施例1)
ポリオレフィンとして低密度ポリエチレン(LDPE)と、膨潤性マイカ10%とを二軸混練押出機に投入し、混練する。得られた二軸混練品ぺレットを、固相せん断混練装置(KCK80×2−35VEX、製造元株式会社ケー・シー・ケー)に投入して、固相状態で混練する。
得られた固相混練物をフィルム押出成形によってフィルムサンプルを得る。得られたサンプルについて、酸素透過度を測定する。
測定結果は、4104(cc/m day)であり、良好な酸素バリア性を示す。
低密度ポリエチレン(LDPE)のみの二軸混練品をフィルム押出成形によって得た参考フィルムサンプルについての酸素透過度が、5504(cc/m day)であるので、上記実施品は25%改良されていることと示す。
【0019】
(実施例2)
ポリオレフィンとして低密度ポリエチレン(LDPE)とマイカ10%とを二軸混練押出機に投入し、混練する。得られた二軸混練品ぺレットを、固相せん断混練装置に投入して、固相状態で混練する。
得られた固相混練物をフィルム押出成形によってフィルムサンプルを得る。得られたサンプルについて、酸素透過度を測定する。
測定結果は、3562(cc/m day)であり、参考サンプルと比較して35%改良され、非常に良好な酸素バリア性を示す。
【0020】
(実施例3)
粉体の低密度ポリエチレン(LDPE)と水処理膨潤性マイカ10%とを混合し、そのまま固相せん断混練装置に投入して、固相状態で混練する。得られた粉砕パウダーを小型二軸混練機で溶融混練する。
得られた混練物をフィルム押出成形によってフィルムサンプルを得る。得られたサンプルについて、酸素透過度を測定する。
測定結果は、非常に良好な酸素バリア性を示す。
【0021】
(比較例1)
低密度ポリエチレン(LDPE)と膨潤性マイカ10%とを二軸混練押出機に投入し、混練する。得られた二軸混練品をフィルム押出成形によってフィルムサンプルを得る。得られたサンプルについて、酸素透過度を測定する。
測定結果は、4349(cc/m day)であり、参考サンプルと比較して21%改良されるが、実施例と比較して劣った酸素バリア性を示す。
【0022】
(比較例2)
低密度ポリエチレン(LDPE)とマイカ10%とを二軸混練押出機に投入し、混練する。得られた二軸混練品をフィルム押出成形によってフィルムサンプルを得る。得られたサンプルについて、酸素透過度を測定する。
測定結果は、4299(cc/m day)であり、参考サンプルと比較して22%改良されるが、実施例と比較して劣った酸素バリア性を示す。
【0023】
【発明の効果】
以上説明したように本発明の樹脂組成物の製造法及び食品用包装積層体によって、(1)食品衛生上問題になる化学物質を用いず安全である。
(2) 本発明における食品包装用樹脂組成物及び包装用積層体は、ポリマー中に層状珪酸塩が均一に分された状態で存在することから、優れた酸素バリア性を備え、しかも、保香及び品質保持性に優れている。
(3) この発明の混練条件さえ満足すれば、廉価な天然若しくは合成の層状珪酸塩原料を用いることができる。
[0001]
The present invention relates to a method for producing a resin composition for food packaging and a laminate for packaging.
[0002]
[Prior art]
The resin composition for food packaging is used in food packaging as a constituent layer of a laminate. When used as a barrier laminate for food packaging, as a method for improving the gas barrier properties of a resin composition for food packaging, for example, a polymer such as polyolefin or polyamide, layered silicates (so-called clays and clays) or interlayers can be used. There is a method in which a layered silicate obtained by ion-exchanging ions with organic onium ions is dispersed in a polyamide resin to form a composite.
Most of the clay is crystalline, and is mainly composed of hydrated silicate minerals having the same orderly layered structure as mica in rocks. Its chemical components are mainly silicic acid, alumina and water. Mg. Ca. Na. K and the like are included. Layered clay minerals widely included as fine-grained minerals in clay include kaolin minerals, mica clay minerals, smectites (montmorillonite), and types called mixed layer minerals.
[0003]
Generally, it is difficult for a non-polar resin such as polyolefin to peel off non-swelled clay in a minute layer.
Therefore, there are roughly two types of compounding methods for easily imparting a barrier property. A method of uniformly dispersing a layered silicate in a polymer is a method of contacting with a swelling agent, expanding the layers in advance to make it easier to take in monomers between the layers, and then mixing with the monomers and polymerizing (Japanese Patent Laid-Open No. 48-103653). JP-B-58-35542, JP-A-62-74957), using a polymer compound as a swelling agent, expanding the interlayer between layers to 100 mm or more in advance, and melting the polymer and the layered silicate into a polymer. Method of dispersing layered silicate by mechanical shearing force using a twin-screw extruder or the like under a temperature condition not lower than the temperature (melt mixing method) (JP-B-58-35542, JP-A-47-36686) Gazette).
[Problems to be solved by the invention]
[0004]
However, the above method of polymerizing requires modification of the polymerization apparatus itself, which is large and expensive. In the layered silicate / polymer composite film produced by the above-described melt mixing method, the dispersion of the layered silicate itself is not sufficient, and irregularities and the like appear on the film surface, and the film appearance and transparency are significantly impaired. Also has the disadvantage that the mechanical properties are reduced.
In addition, the obtained resin composition does not always have good barrier properties, and when used for food packaging, there may be a problem with a swelling agent to be added in food hygiene.
[0005]
The present invention provides a food packaging resin composition which is safe without using an additive swelling agent which is a problem in food hygiene, can easily and uniformly disperse the layered silicate, and has excellent barrier properties. It is an object of the present invention to provide a method and a laminate for packaging.
[0006]
[Means for Solving the Problems]
In order to solve this problem, the present invention relates to a resin composition and a food packaging laminate containing fine layered silicate that is substantially uniformly dispersed in polyolefin, to prepare a layered silicate raw material, The method is characterized in that a layered silicate raw material is charged together with a polyolefin into a solid-phase shear kneader, and kneaded while exfoliating the layered silicate minutely in a solid state.
According to the above invention, a method for producing a resin composition for food packaging, which is safe without using a chemical substance that poses a problem in food hygiene, can easily disperse the layered silicate uniformly, and has excellent barrier properties, A laminate can be realized.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention of the method for producing a resin composition for food packaging according to claim 1 of the present invention is a method for producing a resin composition containing fine layered silicate substantially uniformly dispersed in polyolefin. Preparing a layered silicate raw material, filling the layered silicate raw material together with a polyolefin into a solid-phase shear kneader, and kneading the layered silicate in the solid state while exfoliating the layered silicate minutely. .
In the present invention, since the layered silicate raw material and the polyolefin are sheared and kneaded in the solid state, a resin composition containing fine layered silicate substantially uniformly dispersed in the polyolefin can be obtained. Such a resin composition has an effect of excellent gas barrier properties.
[0008]
According to the first aspect of the present invention, the layered silicate raw material and the polyolefin are preliminarily kneaded with a biaxial kneading extruder before the solid phase shear kneading step, if necessary. Thereafter, the kneaded product of the layered silicate raw material and the polyolefin can be kneaded with a twin-screw kneading extruder.
According to this aspect, in kneading, the energy required for shearing by the solid-phase shear kneader can be reduced, and further, there is an effect that the processing in the subsequent step is facilitated.
[0009]
The invention according to claim 2 is characterized in that the polyolefin is a powdered polyethylene having a low melt flow rate and / or a high density.
According to the present invention, the required energy for shearing by the solid-phase shear kneader can be reduced, and the layered silicate is more finely and uniformly exfoliated in a layered form and uniformly dispersed.
[0010]
The invention according to claim 3 is characterized in that the layered silicate raw material is composed of a natural or synthetic layered silicate that has not been chemically modified.
According to the present invention, since no additives such as a swelling agent, which poses a problem in food hygiene, are used, there is no danger of the chemical components leaking out to the contents, and the effect of food hygiene is provided.
[0011]
The invention according to claim 4 is a laminate including a barrier layer containing fine layered silicate substantially uniformly dispersed in a polyolefin, wherein the barrier layer is formed of the layered silicate raw material. A food packaging laminate characterized by being a resin composition obtained by filling a solid-phase shear kneader with a polyolefin and kneading the layered silicate in a solid state while finely exfoliating the layered layer. is there.
In the present invention, a barrier layer of a resin composition containing fine layered silicate, which is obtained by shear-kneading a layered silicate raw material and a polyolefin in a solid state, and being substantially uniformly dispersed in the polyolefin, is formed. It has an effect of excellent gas barrier properties.
[0012]
Hereinafter, embodiments of the present invention will be described in detail.
The polyolefin used in the present invention is a homopolymerized polyolefin such as polyethylene and polypropylene, a copolymer with the polyolefin, a bunlend polymer with the polyolefin, and the like.
When polyethylene is used, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and metallocene PE are used because polyethylene is required to have heat-sealing properties for packaging. Further, medium density polyethylene (MDPE) or high density polyethylene (HDPE) may be used.
[0013]
Examples of the raw material of the layered silicate include a layered phyllosilicate mineral composed of a layer of magnesium silicate or aluminum silicate. Specifically, 1: 1 type layered silicates, ie, kaolinite, dickite, halloysite, antigonite, chrysotile, etc., and 2: 1 type layered silicates, ie, montmorillonite, hectorite, fluorine hectorite, saponite , Swelling synthetic mica such as smectites such as beidellite, subbutinsite and vermiculite, mica such as muscovite and phlogopite, fluorophlogopite, fluorphlogopite, K-type fluoroteniolite and K-type tetrasilicic mica; Li Swellable synthetic fluoromica such as fluorinated teniolite, Na-fluorinated teniolite and Na-tetrasilicon fluormica, margarite, pyrophyllite, talc, chlorite and the like. From the viewpoint of surface appearance, product coloring, and gas barrier properties, montmorillonite, hectorite, fluorine hectorite, and swellable synthetic fluorine mica are preferred.
[0014]
In a preferred embodiment of the present invention, a layered silicate (clay) having a metal ion other than Na, K, Li and Ca (for example, a metal ion selected from Ag, Zn, Co, Cd and Cu) or a metal compound thereof between layers. Mineral) can be used. The layered silicate itself has excellent antibacterial properties against various microorganisms such as Pseudomonas aeruginosa, Escherichia coli, and Staphylococcus aureus. Accordingly, the antibacterial property is imparted to the barrier layer containing the layered silicate, and also to the packaging laminate according to the present invention.
The blending amount of the layered silicate can be appropriately selected and changed with respect to the polyolefin in consideration of the oxygen barrier property, the durability against stress, the effect of improving fragrance retention and quality retention, and the like.
[0015]
In the present invention, the method of uniformly dispersing the layered silicate in the polyolefin is as follows: first, a layered silicate raw material is prepared, and the layered silicate raw material is charged together with the polyolefin into a solid-phase shear kneader, and the layered silicate is layered in the solid phase The silicate is kneaded while exfoliating finely in layers. By this kneading step, a resin composition containing fine layered silicates substantially uniformly dispersed in the polyolefin is obtained.
The solid state shear kneader mixes the polyolefin with the layered silicate in a solid state at room temperature, not in a molten state. Therefore, the kneading effect of this solid state kneading is much higher than that of melt kneading. During solid phase shear kneading, high shear forces are generated in the polyolefin and the layered silicate, leading to easy delamination. This indicates that delamination is difficult without the use of chemically modified layered silicate, but the use of chemically modified layered silicate should be avoided for food hygiene. According to the present invention, the above problem can be solved.
[0016]
In a preferred embodiment of the present invention, before the solid-phase shear kneading step, the layered silicate raw material and the polyolefin are pre-kneaded by a twin-screw kneading extruder, and after the solid-phase shear kneading step, the layered silicate raw material is And a polyolefin can be kneaded with a twin-screw kneading extruder.
In a further preferred embodiment of the present invention, the polyolefin is a powdered polyethylene having a low melt flow rate and / or a high density.
In a preferred embodiment of the present invention, the layered silicate raw material comprises a natural or synthetic layered silicate that has not been chemically modified.
[0017]
【Example】
The present invention will be described more specifically with reference to examples and comparative examples.
The method of uniformly dispersing the layered silicate in the polyolefin is as follows. First, a layered silicate raw material is prepared, the layered silicate raw material is charged together with the polyolefin into a solid-phase shear kneader, and the layered silicate is finely dispersed in a solid state. And kneading while peeling into layers.
[0018]
(Example 1)
Low-density polyethylene (LDPE) as polyolefin and 10% of swellable mica are charged into a twin-screw kneading extruder and kneaded. The obtained biaxially kneaded pellets are put into a solid-phase shear kneading apparatus (KCK80 × 2-35VEX, manufactured by KK Corporation) and kneaded in a solid state.
A film sample is obtained from the obtained solid phase kneaded material by film extrusion molding. The oxygen permeability of the obtained sample is measured.
The measurement result was 4104 (cc / m 2 day), indicating good oxygen barrier properties.
Since the oxygen permeability of a reference film sample obtained by film extrusion of a biaxially kneaded product of only low density polyethylene (LDPE) is 5504 (cc / m 2 day), the above-mentioned embodiment is improved by 25%. To indicate that
[0019]
(Example 2)
A low-density polyethylene (LDPE) as a polyolefin and 10% of mica are charged into a twin-screw kneading extruder and kneaded. The obtained biaxially kneaded pellet is put into a solid-phase shear kneading apparatus and kneaded in a solid state.
A film sample is obtained from the obtained solid phase kneaded material by film extrusion molding. The oxygen permeability of the obtained sample is measured.
The measurement result is 3562 (cc / m 2 day), which is improved by 35% as compared with the reference sample, and shows a very good oxygen barrier property.
[0020]
(Example 3)
Powdered low-density polyethylene (LDPE) and 10% of water-treated swellable mica are mixed, and the mixture is directly charged into a solid-phase shear kneading apparatus and kneaded in a solid state. The obtained crushed powder is melt-kneaded by a small twin-screw kneader.
A film sample is obtained from the kneaded product by film extrusion molding. The oxygen permeability of the obtained sample is measured.
The measurement results show a very good oxygen barrier property.
[0021]
(Comparative Example 1)
Low-density polyethylene (LDPE) and 10% of swellable mica are charged into a twin-screw kneading extruder and kneaded. A film sample is obtained from the obtained biaxially kneaded product by film extrusion molding. The oxygen permeability of the obtained sample is measured.
The measurement result is 4349 (cc / m 2 day), which is 21% improved as compared with the reference sample, but shows inferior oxygen barrier properties as compared with the examples.
[0022]
(Comparative Example 2)
Low-density polyethylene (LDPE) and 10% of mica are charged into a twin-screw kneading extruder and kneaded. A film sample is obtained from the obtained biaxially kneaded product by film extrusion molding. The oxygen permeability of the obtained sample is measured.
The measurement result is 4299 (cc / m 2 day), which is 22% improved as compared with the reference sample, but shows inferior oxygen barrier properties as compared with the examples.
[0023]
【The invention's effect】
As described above, according to the method for producing the resin composition of the present invention and the food packaging laminate, (1) it is safe without using a chemical substance which poses a problem in food hygiene.
(2) The resin composition for food packaging and the laminate for packaging according to the present invention have excellent oxygen barrier properties because the layered silicate is uniformly distributed in the polymer, and furthermore have a fragrance retention. And excellent quality retention.
(3) As long as the kneading conditions of the present invention are satisfied, an inexpensive natural or synthetic layered silicate raw material can be used.

Claims (4)

ポリオレフィン中に実質的に均一に分散している微小な層状珪酸塩を含有する樹脂組成物の製造法であって、
層状珪酸塩原料を調製し、
該層状珪酸塩原料をポリオレフィンと共に、固相せん断混練機に充填し、
固相状態で層状珪酸塩を微小に層状に剥離しながら混練することを特徴とする食品包装用樹脂組成物の製造法。
A method for producing a resin composition containing fine layered silicates substantially uniformly dispersed in a polyolefin,
Prepare layered silicate raw material,
Filling the layered silicate raw material together with the polyolefin into a solid-phase shear kneader,
A method for producing a resin composition for food packaging, comprising kneading a layered silicate in a solid state while exfoliating the layered silicate in a fine layer.
ポリオレフィンが低いメルトフローレート及び/又は高い密度を有する粉状ポリエチレンである、請求項1記載の食品包装用樹脂組成物の製造法。The method for producing a resin composition for food packaging according to claim 1, wherein the polyolefin is a powdery polyethylene having a low melt flow rate and / or a high density. 層状珪酸塩原料が化学的変性されていない天然若しくは合成の層状珪酸塩からなる、請求項1記載の食品包装用樹脂組成物の製造法。The method for producing a resin composition for food packaging according to claim 1, wherein the layered silicate raw material comprises a natural or synthetic layered silicate that has not been chemically modified. ポリオレフィン中に実質的に均一に分散している微小な層状珪酸塩を含有するバリア層を含む積層体であって、
該バリア層が、該層状珪酸塩原料をポリオレフィンと共に固相せん断混練機に充填して、固相状態で層状珪酸塩を微小に層状に剥離しながら混練することによって得られた樹脂組成物であることを特徴とする食品包装用積層体。
A laminate comprising a barrier layer containing fine layered silicates substantially uniformly dispersed in polyolefin,
The barrier layer is a resin composition obtained by filling the layered silicate raw material together with a polyolefin into a solid-phase shear kneader, and kneading the layered silicate in a solid state while exfoliating the layered silicate in a fine layer. A laminate for food packaging, characterized in that:
JP2002323526A 2002-11-07 2002-11-07 Manufacturing method for resin composition for food packaging and laminate for packaging Pending JP2004155078A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006104129A1 (en) * 2005-03-28 2006-10-05 Mitsubishi Chemical Corporation Modified olefin polymer composition and olefin polymer composition containing the same
WO2013150973A1 (en) * 2012-04-04 2013-10-10 積水化学工業株式会社 Process for manufacturing resin composite material, and resin composite material
JP2013231158A (en) * 2012-04-04 2013-11-14 Sekisui Chem Co Ltd Process for manufacturing resin composite material, and resin composite material
JP2013233790A (en) * 2012-04-11 2013-11-21 Sekisui Chem Co Ltd Method for manufacturing resin molded article, and resin molded article

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006104129A1 (en) * 2005-03-28 2006-10-05 Mitsubishi Chemical Corporation Modified olefin polymer composition and olefin polymer composition containing the same
WO2013150973A1 (en) * 2012-04-04 2013-10-10 積水化学工業株式会社 Process for manufacturing resin composite material, and resin composite material
JP2013231158A (en) * 2012-04-04 2013-11-14 Sekisui Chem Co Ltd Process for manufacturing resin composite material, and resin composite material
JP2013233790A (en) * 2012-04-11 2013-11-21 Sekisui Chem Co Ltd Method for manufacturing resin molded article, and resin molded article

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