JP6904645B2 - Polyamide film - Google Patents
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本発明は、優れた透明性、実用強度を有し、押出温度や滞留時間やせん断速度等の生産条件に影響されることなく、安定して生産することができる長手方向に易引裂き直進性を有する二軸延伸ポリアミドフィルムに関するものである。 The present invention has excellent transparency and practical strength, and easily tears straight in the longitudinal direction, which enables stable production without being affected by production conditions such as extrusion temperature, residence time, and shear rate. It relates to a biaxially stretched polyamide film having.
二軸延伸ポリアミドフィルムは突刺強度や衝撃強度に優れることから、食品、薬品、工業製品等を包装するために袋状に加工後、様々な形態で大量に使用されており、二軸延伸ポリアミドフィルムとヒートシール可能な無配向フィルムとをラミネートしたものが使用されている。 Since the biaxially stretched polyamide film has excellent piercing strength and impact strength, it is used in large quantities in various forms after being processed into a bag shape for packaging foods, chemicals, industrial products, etc., and the biaxially stretched polyamide film is used in large quantities. And a heat-sealable non-oriented film are laminated.
二軸延伸ポリアミドフィルムを使用した包装袋に特に要求される特性としては耐ピン性と易引裂き性があるが、二軸延伸ポリアミドフィルムは強靭なフィルムであるがゆえ、易引裂き性についてはミシン目、レーザーカット加工、ティアテープ等の加工をする必要があった。しかしこのような加工方法では基材の易引裂き性はないため、最後まで直線的に引裂けない場合や、途中でひっかかってしまい、内容物が飛散してしまうのなどのトラブルが生じる場合があった。 The characteristics particularly required for packaging bags using a biaxially stretched polyamide film are pin resistance and easy tearing. However, since the biaxially stretched polyamide film is a tough film, the easy tearing property is perforated. , Laser cut processing, tear tape processing, etc. were required. However, with such a processing method, the base material is not easily torn, so there may be problems such as not being able to tear linearly to the end, or being caught in the middle and the contents being scattered. rice field.
上記の問題を解決する方法として、ポリアミド樹脂の改質により易引裂き性を付与する方法があった。脂肪族ポリアミドとメタキシリレンアジパミド（以下「ＭＸＤ６」）を脂肪族ポリアミド／ＭＸＤ６＝４０〜８５重量部／１５〜６０重量部のからなる混合ポリアミド組成物を溶融押出し、インフレーション法を用いて、長手方向（ＭＤ）、巾方向（ＴＤ）共に２．８倍以上に延伸した易引裂き性フィルムが複数層の１層として形成されたランネートフィルムが提案されている。（特許文献１、特許文献２）
また脂肪族ポリアミド／ＭＸＤ６＝８０〜９５重量部／２０〜５重量部の混合物からなり、ＭＸＤ６の分散粒子の形状を特定の形状に分散させた引裂き直進性を有する二軸配向ポリアミドフィルムが提案されている（特許文献３）
As a method for solving the above problems, there is a method of imparting easy tearability by modifying a polyamide resin. A mixed polyamide composition consisting of an aliphatic polyamide / MXD6 = 40 to 85 parts by weight / 15 to 60 parts by weight is melt-extruded from an aliphatic polyamide and metaxylylene adipamide (hereinafter referred to as "MXD6"), and an inflation method is used. , A lanate film in which an easily tearable film stretched 2.8 times or more in both the longitudinal direction (MD) and the width direction (TD) is formed as one layer of a plurality of layers has been proposed. (Patent Document 1, Patent Document 2)
Further, a biaxially oriented polyamide film having tear straightness, which is composed of a mixture of aliphatic polyamide / MXD6 = 80 to 95 parts by weight / 20 to 5 parts by weight and in which the shape of the dispersed particles of MXD6 is dispersed in a specific shape has been proposed. (Patent Document 3)
しかし、易引裂き性を発現するためには、ＭＸＤ６が脂肪族ポリアミド中に適度に分散している必要があるが、脂肪族ポリアミドとＭＸＤ６を溶融混合すると高温の場合や滞留時間が長くなる場合、若しくはせん断が大きくかかる場合は脂肪族ポリアミドとＭＸＤ６の共重合反応が進み、ＭＸＤ６の分散粒子が消失し、易引裂き性が発現しなくなるという問題があり、押出機の種類、スクリュータイプ、押出機ホッパーからダイまでの距離、フィルム製膜時の押出条件（温度、速度、回転数、フィルターメッシュなど）の面で制約が大きかった。 However, in order to exhibit easy tearability, MXD6 needs to be appropriately dispersed in the aliphatic polyamide, but when the aliphatic polyamide and MXD6 are melt-mixed at a high temperature or the residence time becomes long, Alternatively, if a large amount of shear is applied, there is a problem that the copolymerization reaction of the aliphatic polyamide and MXD6 proceeds, the dispersed particles of MXD6 disappear, and the easy tearing property is not exhibited. There were many restrictions in terms of the distance from the die to the die and the extrusion conditions (temperature, speed, rotation speed, filter mesh, etc.) during film formation.
また、脂肪族ポリアミドとＭＸＤ６の末端基をそれぞれ安息香酸で封鎖した樹脂混合物を用いることにより脂肪族ポリアミドとＭＸＤ６を溶融混合しても共重合反応を抑制でき、脂肪族ポリアミド中にＭＸＤ６を分散させたままにすることが可能になり、フィルム製造装置や生産条件に影響されることなく、長手方向に引裂いた際の引裂き直進性に優れたフィルムを安定的に生産できる方法が提案されている（特許文献４）。 Further, by using a resin mixture in which the terminal groups of the aliphatic polyamide and MXD6 are sealed with benzoic acid, the copolymerization reaction can be suppressed even if the aliphatic polyamide and MXD6 are melt-mixed, and MXD6 is dispersed in the aliphatic polyamide. A method has been proposed that enables stable production of a film having excellent tear straightness when torn in the longitudinal direction without being affected by the film manufacturing equipment and production conditions. Patent Document 4).
しかし、上記方法で易引裂き性を発現するためには脂肪族ポリアミドとＭＸＤ６のポリマー重合段階において安息香酸を配合しておく必要があり、当該改良法以外に簡便な方法で分散させる方法が求められていた。
However, in order to exhibit easy tearability by the above method, it is necessary to add benzoic acid in the polymer polymerization step of the aliphatic polyamide and MXD6, and a method of dispersing by a simple method other than the improved method is required. Was there.
そこで本発明の課題は、ポリアミド樹脂やＭＸＤ６を改質することなく、脂肪族ポリアミドとＭＸＤ６との共重合反応を抑制し、樹脂の溶融押出し条件にも影響されることなく、安定した、少なくとも長手方向に易引裂き直進性を有する二軸延伸ポリアミドフィルムを得ることを課題とする。
Therefore, the subject of the present invention is to suppress the copolymerization reaction between the aliphatic polyamide and MXD6 without modifying the polyamide resin or MXD6, and to be stable, at least longitudinal, without being affected by the melt extrusion conditions of the resin. An object of the present invention is to obtain a biaxially stretched polyamide film having easy tearing and straightness in the direction.
ポリアミド樹脂とＭＸＤ６の溶融混練時に水酸化マグネシウムを共押出すること、又は、溶融混練前に水酸化マグネシウムをポリアミド樹脂又はＭＸＤ６に混合し、押出しすることで、脂肪族ポリアミドとＭＸＤ６との共重合反応を抑制でき、脂肪族ポリアミド中にＭＸＤ６を長い島状に安定して分散させることが可能となり、フィルムの製造装置や生産条件に影響されずかつ簡便な方法で安定的に生産できることを見いだし本発明を完成させた。 Co-extrusion of magnesium hydroxide during melt-kneading of the polyamide resin and MXD6 , or by mixing magnesium hydroxide with the polyamide resin or MXD6 and extruding before melt-kneading, a copolymerization reaction between the aliphatic polyamide and MXD6. It has been found that MXD6 can be stably dispersed in a long island shape in an aliphatic polyamide, and stable production can be performed by a simple method without being affected by a film manufacturing apparatus or production conditions. Was completed.
具体的には、
（１）脂肪族ポリアミド６０〜９５重量部、メタキシレンアジパミド５〜４０重量部、及び水酸化マグネシウム０．０１〜０．０６重量部からなり、
該脂肪族ポリアミドと該メタキシレンアジパミドとの共重合反応が抑制されて、示差走査熱量測定で２つの融点ピークを示す、少なくとも長手方向に易引裂き直進性を有する二軸延伸ポリアミドフィルム、
（２）複数層からなる易引裂き直進性を有するラミネートフィルムであって、
該複数層のうち少なくとも１層が（１）に記載の二軸延伸ポリアミドフィルムからなることを特徴とする、ラミネートフィルム、
（３）（２）に記載の易引裂き直進性を有するラミネートフィルムを使用したことを特徴とする易引裂き性袋、
を提供する。
In particular,
(1) 60 to 95 parts by weight of aliphatic polyamide, 5 to 40 parts by weight of metaxylene adipamide, and 0.01 to 0 parts by weight of magnesium hydroxide. Ri Do from 06 parts by weight,
A biaxially stretched polyamide film having at least longitudinally easily tearing straightness, in which the copolymerization reaction between the aliphatic polyamide and the metaxylene adipamide is suppressed and two melting point peaks are exhibited by differential scanning calorimetry .
(2 ) A laminated film composed of a plurality of layers and having easy tearing straightness.
A laminated film, wherein at least one of the plurality of layers is composed of the biaxially stretched polyamide film according to (1).
( 3 ) An easy-to-tear bag, characterized in that the laminated film having the easy-to-tear straightness described in (2) is used.
I will provide a.
本発明によれば、特に食品などの包装材料として強く要求されているフィルムの長手方向の引裂直進性に優れ、耐ピン性に優れたフィルムが得られる。
またフィルムの製造条件（押出温度や滞留時間、せん断速度）などに影響されることなく安定して上記性能が得られる。
According to the present invention, it is possible to obtain a film having excellent tear straightness in the longitudinal direction and excellent pin resistance, which is particularly strongly required as a packaging material for foods and the like.
Further, the above performance can be stably obtained without being affected by the film manufacturing conditions (extrusion temperature, residence time, shear rate) and the like.
本発明において使用される脂肪族ポリアミドは特に制限はないが、ナイロン６、ナイロン６６、ナイロン４６、ナイロン６１０、ナイロン１２などの脂肪族ポリアミドであり、これらの熱可塑性樹脂は単独重合体であっても共重合体であってもよい。また、ナイロン６原料において、数平均分子量は１００００〜３００００が好ましく、特に好ましくは２２０００〜２４０００である。数平均分子量が１００００未満の場合、得られたＯＮｙフィルムの衝撃強度や引張強度が不十分である。また数平均分子量が３００００より大きい場合、分子鎖の絡み合いが著しく、延伸加工により過度なひずみが生じるため、延伸加工時に破断やパンクが頻繁に発生し、安定的に生産出来ない。 The aliphatic polyamide used in the present invention is not particularly limited, but is an aliphatic polyamide such as nylon 6, nylon 66, nylon 46, nylon 610, and nylon 12, and these thermoplastic resins are homopolymers. May also be a copolymer. Further, in the nylon 6 raw material, the number average molecular weight is preferably 1000 to 30000, and particularly preferably 22000 to 24000. When the number average molecular weight is less than 10,000, the impact strength and tensile strength of the obtained ONy film are insufficient. When the number average molecular weight is larger than 30,000, the molecular chains are significantly entangled and excessive strain is generated by the stretching process, so that breakage and puncture frequently occur during the stretching process, and stable production cannot be performed.
また、本発明において用いられるＭＸＤ６は、メタキシリレンジアミンとアジピン酸との重縮合反応で生成する構造単位を有したものであり、この熱可塑性樹脂は単独重合体であっても共重合体であってもよい。 Further, MXD6 used in the present invention has a structural unit produced by a polycondensation reaction of methylylenediamine and adipic acid, and this thermoplastic resin is a copolymer even if it is a homopolymer. There may be.
本発明は、脂肪族ポリアミド６０〜９５重量部、及びメタキシレンアジパミド５〜４０重量部で構成される。また、本発明においては脂肪族ポリアミドとＭＸＤ６とが互いに混合され溶融混練された履歴をもつ混合原料であってもよい。 The present invention is composed of 60 to 95 parts by weight of an aliphatic polyamide and 5 to 40 parts by weight of metaxylene adipamide. Further, in the present invention, the aliphatic polyamide and MXD6 may be mixed raw materials having a history of being mixed with each other and melt-kneaded.
本発明において使用する水酸化マグネシウムは、同じ種類で、平均粒子径、比表面積が異なる粒子を複数併用してもかまわない。 Water magnesium oxide that is used in the present invention, with the same kind, average particle size, specific surface area may be a plurality of combinations of different particles.
本発明で用いる水酸化マグネシウムの添加量は脂肪族ポリアミドとＭＸＤ６との合計１００重量部に対して０．０１〜０．５０重量部であり、０．０２〜０．３０重量部の範囲が好ましく、０．０４〜０．２５重量部の範囲がより好ましい。０．０１重量部より少ないと、共重合抑制効果が得られず、０．５０重量部よりも多いと透明性の低下や押出トラブルが発生することがある。 The amount of magnesium hydroxide added in the present invention is 0.01 to 0.50 parts by weight, preferably 0.02 to 0.30 parts by weight, based on 100 parts by weight of the total of the aliphatic polyamide and MXD6. , 0.04 to 0.25 parts by weight is more preferable. If it is less than 0.01 parts by weight, the copolymerization suppressing effect cannot be obtained, and if it is more than 0.50 parts by weight, a decrease in transparency and extrusion trouble may occur.
本発明で用いる水酸化マグネシウムの比表面積に特に制限はないが、ＢＥＴ法で求めた比表面積に対して、１０〜５００μｍ２／ｇが好ましく、２０〜３００μｍ２／ｇがさらに好ましい。３００μｍ２／を超えると急速な吸湿を伴うことがあり、製造時の取り扱いが困難になることがある。 No particular limitation is imposed on the specific surface area of the magnesium hydroxide used in the present invention, with respect to the specific surface area determined by the BET method is preferably 10 to 500 [mu] m 2 / g, more preferably 20 to 300 [mu] m 2 / g. If it exceeds 300 μm 2 /, it may be accompanied by rapid moisture absorption, which may make it difficult to handle during manufacturing.
本発明で用いる水酸化マグネシウムの平均粒径に特に制限はないが、５μ以下であることが好ましく、１μ以下であることがより好ましい。 The average particle size of magnesium hydroxide used in the present invention is not particularly limited, but is preferably 5 μm or less, and more preferably 1 μm or less.
本発明で用いる水酸化マグネシウムの表面処理として処理無しでも使用できるが、透明性が低下することがあるので、表面処理をしたものを使用するのが好ましい。表面処理剤、表面処理方法は、特に限定されるものではなく、公知の方法で良い。例えば表面処理剤としては、シラン、チタンおよびアルミニウム系カップリング剤、高級脂肪酸および燐酸エステル、それらのアルカリ金属塩、多価アルコールと脂肪酸のエステル類等で表面処理したものが好適に利用できる。この際表面処理方法は、水またはアルコールなどの溶媒中に水酸化マグネシウムを懸濁させ、２０℃〜８０℃に加温させる。その中に水またはアルコールなどの溶媒に溶解した表面処理剤溶液を注加した後固液分離し、洗浄して乾燥させる湿式方法、あるいは水酸化マグネシウムの粉末を５０℃〜１５０℃の温度で攪拌しながら、前記表面処理剤溶液を注加する乾式方法が挙げられる。 Although it can be used as the surface treatment of magnesium hydroxide used in the present invention without treatment, it is preferable to use the surface-treated magnesium hydroxide because the transparency may be lowered. The surface treatment agent and the surface treatment method are not particularly limited, and known methods may be used. For example, as the surface treatment agent, those surface-treated with silane, titanium and aluminum-based coupling agents, higher fatty acids and phosphoric acid esters, alkali metal salts thereof, esters of polyhydric alcohols and fatty acids and the like can be preferably used. At this time, the surface treatment method is to suspend magnesium hydroxide in a solvent such as water or alcohol and heat it to 20 ° C to 80 ° C. A wet method in which a surface treatment agent solution dissolved in a solvent such as water or alcohol is poured, then solid-liquid separation is performed, and the mixture is washed and dried, or magnesium hydroxide powder is stirred at a temperature of 50 ° C to 150 ° C. However, a dry method of adding the surface treatment agent solution can be mentioned.
本発明で用いる水酸化マグネシウムは分散性を向上させる目的で事前に脂肪族ポリアミド又はＭＸＤ６と溶融混練したものを使用してもよい。 The magnesium hydroxide used in the present invention may be melt-kneaded with an aliphatic polyamide or MXD6 in advance for the purpose of improving dispersibility.
本発明では、脂肪族ポリアミドとＭＸＤ６の共重合反応を抑制していることが必要である。そのため、延伸後のフィルムの融点を示差走査熱量計（ＤＳＣ）で測定した場合、脂肪族ポリアミドとＭＸＤ６の２つの融点ピークが観察される。ピークが１つの場合、脂肪族ポリアミドとＭＸＤ６の共重合反応が進行しすぎているため、良好な易引裂き性を得ることはできない。なお、示差走査熱量計の条件は、本願実施例中の記載による。 In the present invention, it is necessary to suppress the copolymerization reaction between the aliphatic polyamide and MXD6. Therefore, when the melting point of the stretched film is measured by a differential scanning calorimeter (DSC), two melting point peaks of aliphatic polyamide and MXD6 are observed. When there is one peak, the copolymerization reaction between the aliphatic polyamide and MXD6 has proceeded too much, so that good tearability cannot be obtained. The conditions of the differential scanning calorimeter are as described in the examples of the present application.
ラミ強度の低下やフィルム製膜時の目ヤニ発生といった点で大きく支障をきたさない範囲で、必要に応じて通常配合される添加剤及び改質剤を配合することができる。例えば耐熱安定剤、紫外線吸収剤、光安定剤、酸化防止剤、帯電防止剤、粘着性付与剤、シール性改良剤、防曇剤、結晶核剤、離型剤、可塑剤、架橋剤、難燃剤および着色剤（顔料、染料など）が挙げられる。 Additives and modifiers that are usually blended can be blended as necessary within a range that does not significantly hinder the reduction of the Lami strength and the generation of rheumatism during film formation. For example, heat-resistant stabilizers, UV absorbers, light stabilizers, antioxidants, antistatic agents, tackifiers, sealability improvers, antifogging agents, crystal nucleating agents, mold release agents, plasticizers, cross-linking agents, difficulties. Examples include flame retardants and colorants (pigments, dyes, etc.).
本発明のフィルムを製造するには公知のフィルム製膜法によって、本発明の二軸延伸ポリアミドフィルムに成形することができる。例えば、Ｔダイから溶融ポリマーを押出後、キャスティングロールで冷却して未延伸シートを作製し、これを同時二軸延伸、または、逐次二軸延伸する。また他の方法としてはリングダイから溶融ポリマーを円筒状に押し出し、一旦冷却後、前後のニップロール中に空気を保持させて加熱しながら連続同時二軸延伸するチューブラー製膜が挙げられる。 To produce the film of the present invention, it can be molded into the biaxially stretched polyamide film of the present invention by a known film forming method. For example, after extruding a molten polymer from a T-die, it is cooled by a casting roll to prepare an unstretched sheet, which is simultaneously biaxially stretched or sequentially biaxially stretched. Another method is a tubular film formation in which a molten polymer is extruded from a ring die into a cylindrical shape, cooled once, and then continuously biaxially stretched while being heated while holding air in the front and rear nip rolls.
延伸倍率はＭＤ及びＴＤ共、２〜６倍、好ましくは２．５〜４倍である。２倍未満では必要な強度物性が得られない。６倍より大きい延伸倍率では、延伸の安定性に欠け、フィルムの切断等トラブルが多くなる。 The draw ratio is 2 to 6 times, preferably 2.5 to 4 times for both MD and TD. If it is less than twice, the required strength physical properties cannot be obtained. If the draw ratio is larger than 6 times, the stability of stretching is lacking, and troubles such as cutting of the film increase.
二軸延伸後のフィルムは寸法安定性を良くするために、必要に応じ熱処理を施す。また、必要に応じて、コロナ放電処理をおこなってもよい。 The film after biaxial stretching is heat-treated as necessary to improve dimensional stability. Further, if necessary, a corona discharge treatment may be performed.
上記の方法で得られる本発明の二軸延伸ポリアミドフィルムの厚みは８〜５０μｍ、好ましくは１０〜３０μｍである。 The thickness of the biaxially stretched polyamide film of the present invention obtained by the above method is 8 to 50 μm, preferably 10 to 30 μm.
本発明の二軸延伸ポリアミドフィルムは、単層フィルムであってもよいし、共押出やラミネートなどにより、他のフィルムを積層して使用することができる。 The biaxially stretched polyamide film of the present invention may be a single-layer film, or other films may be laminated and used by coextrusion or lamination.
本発明のポリアミドフィルムは優れた強靭性、耐ピンホール性、寸法安定性に加え、フィルムの長手方向に引裂いた際に優れた直線カット性を有するので、包装袋用として好適である。本発明のフィルムを包装袋用として使用する場合、ヒートシール性、ガスバリア性、意匠性などの付与のために、ポリプロピレン、ポリエチレン、エチレンー酢酸ビニル共重合体、若しくはポリエステルなどのフィルム、紙、又はアルミニウムなどの金属箔等を積層することが一般的である。このような場合であっても、本発明のフィルムが、少なくとも１層に有していれば良く、積層する数に制限はない。このような積層フィルムを本発明のフィルムの長手方向が引裂方向となるように製袋することにより、易開封性包装袋が得られる。そして、この包装袋は、優れた直線カット性を有するため、スープ、ジャム、レルトパウチなどの食品をはじめ、医薬品、日用品、トイレタリーなどの包装袋として有用である。 The polyamide film of the present invention has excellent toughness, pinhole resistance, dimensional stability, and excellent linear cutability when the film is torn in the longitudinal direction, and is therefore suitable for packaging bags. When the film of the present invention is used for a packaging bag, a film such as polypropylene, polyethylene, ethylene-vinyl acetate copolymer, or polyester, paper, or aluminum is used to impart heat sealability, gas barrier property, design property, and the like. It is common to stack metal foils such as. Even in such a case, the film of the present invention may have at least one layer, and the number of layers is not limited. An easy-to-open packaging bag can be obtained by making such a laminated film so that the longitudinal direction of the film of the present invention is the tearing direction. Since this packaging bag has excellent linear cut property, it is useful as a packaging bag for foods such as soups, jams, and lert pouches, as well as pharmaceuticals, daily necessities, and toiletries.
以下に、本発明を実施例によって具体的に説明するが、本発明はこれらの実施例に限定されるものではない。なお、フィルムの各物性は、以下に示す方法によって求めた。
（１）直線カット性
延伸フィルムより長手方向（ＭＤ）に２０５ｍｍ、巾方向（ＴＤ）に２０ｍｍの短冊状のフィルム偏を切り出し、このフィルム片の１方のＴＤ編の中央部に長さ５ｍｍの切り込みを入れた試料を１０本作製する。次に、切り込みより長手方向に手で引裂き、引裂き伝播端が切り込みを入れた片に向かい合う短辺に到達した試料本数を評価値とした。
（２）直進性
直線カット性を評価したサンプルの引裂いた箇所の外観が、直線性的であるものを○、少しずれるものを△、大きくずれるものを×とした。
（３）融点
エスアイアイ・ナノテクノロジー社製示差走査熱量測定装置（ＤＳＣ）を用い、昇温速度１０℃／ｍｉｎで５０℃から２８０℃まで昇温を行なって測定した。２ｎｄｒｕｎにおける融点ピークの本数を観察した。
Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples. The physical characteristics of the film were determined by the methods shown below.
(1) Straight cut property A strip-shaped film bias of 205 mm in the longitudinal direction (MD) and 20 mm in the width direction (TD) is cut out from the stretched film, and a length of 5 mm is formed at the center of one TD knitting of this film piece. Prepare 10 samples with cuts. Next, the number of samples that were torn by hand in the longitudinal direction from the notch and reached the short side where the tear propagation end faces the cut piece was used as the evaluation value.
(2) Straightness The appearance of the torn part of the sample evaluated for linear cutability was marked with ◯ for linearity, Δ for slight deviation, and × for large deviation.
(3) Melting Point Using a differential scanning calorimetry device (DSC) manufactured by SII Nanotechnology, the temperature was raised from 50 ° C. to 280 ° C. at a heating rate of 10 ° C./min for measurement. The number of melting point peaks at 2ndrun was observed.
以下に、本願をさらに詳細に説明するため、実施例を記載する。ただし、本願発明は実施例に限定されるものではない。 Hereinafter, examples will be described in order to explain the present application in more detail. However, the present invention is not limited to the examples.
（実施例１）
相対粘度３．５の脂肪族ポリアミド樹脂（ナイロン６：宇部興産（株）製）と相対粘度２．７のＭＸＤ６（芳香族ポリアミド：三菱瓦斯化学（株）製）を８０／２０の割合で混合し、水酸化マグネシウム（キスマ５Ｂ：協和化学工業（株）製）を樹脂成分に対して４００ｐｐｍ添加した混合物をリングダイより溶融押出し、内外水冷マンドレルで冷却し、厚さ１５０μｍのチューブ状フィルムを得た。該チューブフィルムを低速ニップロールと高速ニップロールの速度差及びその間に存在する空気圧によりＭＤとＴＤに同時に二軸延伸した。その後チューブを折り畳んで両端部で２枚に切り開き、テンターオーブンにて２１０℃で１０秒間熱処理し、厚さ１５μｍのフィルムを得、その両耳を切除して平面フィルムとし、２本のロールに巻き取った。
(Example 1)
Aliphatic polyamide resin with a relative viscosity of 3.5 (nylon 6: manufactured by Ube Industries, Ltd.) and MXD6 (aromatic polyamide: manufactured by Mitsubishi Gas Chemical Industry Co., Ltd.) with a relative viscosity of 2.7 are mixed at a ratio of 80/20. Then, a mixture of magnesium hydroxide (Kisma 5B: manufactured by Kyowa Chemical Industry Co., Ltd.) added at 400 ppm to the resin component was melt-extruded from a ring die and cooled with an internal / external water-cooled mandrel to obtain a tubular film having a thickness of 150 μm. rice field. The tube film was biaxially stretched simultaneously in MD and TD by the speed difference between the low speed nip roll and the high speed nip roll and the air pressure existing between them. After that, the tube is folded and cut into two pieces at both ends, heat-treated at 210 ° C. for 10 seconds in a tenter oven to obtain a film having a thickness of 15 μm, and both ears are cut off to form a flat film and wound on two rolls. I took it.
実施例２、４及び比較例１〜７及び参考例３、５、７
混合比、押出溶融温度、アルカリ土類金属、アルカリ土類金属添加量を表１のように変更した以外は実施例１と同様にして延伸フィルムを得た。
得られた延伸フィルムの評価結果を表１に示す。なお表中の熱履歴品とは、ナイロン６とＭＸＤ６の混合品であり、押出機で、ナイロン６とＭＸＤ６を混合し溶融したことがある混合樹脂をいう。
Examples 2 and 4, Comparative Examples 1 to 7 and Reference Examples 3, 5 and 7
A stretched film was obtained in the same manner as in Example 1 except that the mixing ratio, extrusion melting temperature, alkaline earth metal, and amount of alkaline earth metal added were changed as shown in Table 1.
The evaluation results of the obtained stretched film are shown in Table 1. The thermal history product in the table is a mixed product of nylon 6 and MXD6, and refers to a mixed resin in which nylon 6 and MXD6 have been mixed and melted by an extruder.
Claims (3)
該脂肪族ポリアミドと該メタキシレンアジパミドとの共重合反応が抑制されて、示差走査熱量測定で２つの融点ピークを示す、少なくとも長手方向に易引裂き直進性を有する二軸延伸ポリアミドフィルム。 60 to 95 parts by weight of aliphatic polyamide, 5 to 40 parts by weight of metaxylene adipamide, and 0.01 to 0 parts by weight of magnesium hydroxide. Ri Do from 06 parts by weight,
A biaxially stretched polyamide film having at least longitudinally easily tearing straightness, in which the copolymerization reaction between the aliphatic polyamide and the metaxylene adipamide is suppressed and two melting point peaks are exhibited by differential scanning calorimetry.
該複数層のうち少なくとも１層が請求項１に記載の二軸延伸ポリアミドフィルムからなることを特徴とする、ラミネートフィルム。 A laminated film consisting of multiple layers with easy tearing and straightness.
A laminated film, wherein at least one of the plurality of layers is made of the biaxially stretched polyamide film according to claim 1.
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