JP2009056757A - Multi-layer film - Google Patents
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- JP2009056757A JP2009056757A JP2007227442A JP2007227442A JP2009056757A JP 2009056757 A JP2009056757 A JP 2009056757A JP 2007227442 A JP2007227442 A JP 2007227442A JP 2007227442 A JP2007227442 A JP 2007227442A JP 2009056757 A JP2009056757 A JP 2009056757A
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Abstract
Description
本発明は、低温ヒートシール性に優れるとともに、初期滑り特性、エージング後の滑り性に優れる多層フィルムに関するものである。 The present invention relates to a multilayer film that is excellent in low-temperature heat sealability and excellent in initial slip characteristics and slip properties after aging.
ポリプロピレンフィルムは、耐熱性、耐薬品性、ヒートシール性等に優れることから食品包装等に広く利用されている。しかしながら、ヒートシール性材料を表層に用いた場合、滑りやブロッキング特性が悪化する。滑り性の優れるポリプロピレンフィルムを製造する方法として、脂肪酸アミドのような滑剤を使用することが知られており、２種以上の滑剤種を組み合わせることで、より滑り性の改良されたフィルムを得る方法なども知られている。
例えば特開平１１−３３４００４号公報には、中間層に最適エージング温度４０℃以上の滑剤を、両外層に最適エージング温度４０℃未満の滑剤をそれぞれ添加した未延伸フィルムが、良好な滑り性を発現することが記載されている。
近年、ポリプロピレンフィルムの低温ヒートシール化が進む中、初期滑り性、エージング後の滑り性の双方に優れるポリプロピレンフィルムは、未だ開発されていないのが現状である。
Polypropylene films are widely used for food packaging and the like because of their excellent heat resistance, chemical resistance, heat sealability and the like. However, when a heat-sealable material is used for the surface layer, slipping and blocking characteristics are deteriorated. As a method for producing a polypropylene film having excellent slipperiness, it is known to use a lubricant such as fatty acid amide, and by combining two or more lubricant types, a method for obtaining a film with improved slipperiness. Etc. are also known.
For example, in Japanese Patent Application Laid-Open No. 11-334004, an unstretched film in which a lubricant having an optimum aging temperature of 40 ° C. or higher is added to an intermediate layer and a lubricant having an optimum aging temperature of less than 40 ° C. is added to both outer layers exhibits good slip properties. It is described to do.
In recent years, a polypropylene film excellent in both the initial slip property and the slip property after aging has not yet been developed as the polypropylene film is becoming low-temperature heat-sealed.
したがって、本発明の課題は、低温ヒートシール性に優れるとともに、初期滑り特性、およびエージング後の滑り特性の双方に優れるポリプロピレン多層フィルムを提供することにある。 Accordingly, an object of the present invention is to provide a polypropylene multilayer film that is excellent in low temperature heat sealability and excellent in both initial slip characteristics and slip characteristics after aging.
本発明者らは、上記の実情に鑑み、鋭意検討した結果、本発明が、上記の課題を解決できることを見出し、本発明を完成させるに至った。 As a result of intensive studies in view of the above circumstances, the present inventors have found that the present invention can solve the above problems, and have completed the present invention.
すなわち、本発明は、融点が１５０℃以上であり、２０℃キシレン可溶部量（ＣＸＳ）が１％以上であるプロピレン系重合体を含む基材層と、融点が１５０℃未満であり、２０℃キシレン可溶部量（ＣＸＳ）が１％以上であるプロピレン系重合体を含む表層と、からなる多層フィルムであって、基材層と表層はそれぞれ異なる滑剤を含有し、基材層の滑剤濃度が表層の滑剤濃度より高く、基材層に含有される滑剤の融点が表層に含有される滑剤の融点より低いことを特徴とする多層フィルムにかかるものである。 That is, the present invention has a base material layer containing a propylene-based polymer having a melting point of 150 ° C. or more and a 20 ° C. xylene-soluble part amount (CXS) of 1% or more, a melting point of less than 150 ° C., and 20 And a surface layer containing a propylene-based polymer having a xylene soluble part amount (CXS) of 1% or more, wherein the base material layer and the surface layer each contain different lubricants, and the base material layer lubricant The multilayer film is characterized in that the concentration is higher than the lubricant concentration of the surface layer and the melting point of the lubricant contained in the base layer is lower than the melting point of the lubricant contained in the surface layer.
本発明によれば、低温ヒートシール性に優れるとともに、初期滑り特性、およびエージング後の滑り特性の双方に優れる多層フィルムを得ることができる。 According to the present invention, it is possible to obtain a multilayer film that is excellent in low-temperature heat sealability and excellent in both initial slip characteristics and slip characteristics after aging.
本発明で用いられる基材層用樹脂は、プロピレン単独重合体、プロピレン／エチレン共重合体、プロピレン／α−オレフィン共重合体が用いられる。α−オレフィンとしては、１−ブテン、１−ペンテン、４−メチル−１−ペンテン、１−ヘキセン、１−オクテンなどが挙げられる。本発明で用いられる基材層用樹脂の融点は、１５０℃以上であるが、フィルムの剛性等の観点から、好ましくは１５５℃以上、より好ましくは、１５７℃以上である。 As the base layer resin used in the present invention, a propylene homopolymer, a propylene / ethylene copolymer, or a propylene / α-olefin copolymer is used. Examples of the α-olefin include 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene and the like. The base layer resin used in the present invention has a melting point of 150 ° C. or higher, but is preferably 155 ° C. or higher, more preferably 157 ° C. or higher, from the viewpoint of film rigidity.
基材層用樹脂の２０℃キシレン可溶部量（ＣＸＳ）は１重量％以上であり、フィルムの剛性と滑剤のブリード性の観点から、好ましくは２〜５重量％である。 The 20 ° C. xylene-soluble part amount (CXS) of the base layer resin is 1% by weight or more, and preferably 2 to 5% by weight from the viewpoint of film rigidity and lubricant bleedability.
基材層用樹脂のＭＦＲは０．１〜２０ｇ／１０分であり、好ましくは０．１〜１０ｇ／１０分であり、より好ましくは１〜５ｇ／１０分である。０．１ｇ／１０分未満の場合、押出加工時の流動性が不十分であることがあり、２０ｇ／１０分を越えた場合、延伸時に破断が起こることがある。 The MFR of the base layer resin is 0.1 to 20 g / 10 minutes, preferably 0.1 to 10 g / 10 minutes, and more preferably 1 to 5 g / 10 minutes. If it is less than 0.1 g / 10 minutes, fluidity during extrusion may be insufficient, and if it exceeds 20 g / 10 minutes, breakage may occur during stretching.
本発明で用いられる表層用樹脂は、プロピレン／エチレン共重合体、プロピレン／α−オレフィン共重合体が用いられる。α−オレフィンとしては、１−ブテン、１−ペンテン、４−メチル−ペンテン−1、１−ヘキセン、１−オクテンなどが挙げられる。本発明で用いられる表層用樹脂の融点は、１５０℃未満であるが、低温ヒートシール性の観点から、好ましくは１４５℃未満、より好ましくは１４０℃未満である。 As the surface layer resin used in the present invention, a propylene / ethylene copolymer and a propylene / α-olefin copolymer are used. Examples of the α-olefin include 1-butene, 1-pentene, 4-methyl-pentene-1, 1-hexene, 1-octene and the like. The melting point of the surface layer resin used in the present invention is less than 150 ° C., but is preferably less than 145 ° C., more preferably less than 140 ° C. from the viewpoint of low-temperature heat sealability.
表層用樹脂の２０℃キシレン可溶部量（ＣＸＳ）は１重量％以上であり、滑剤のブリード性、およびフィルムのベタツキの観点から、好ましくは２〜２０重量％、より好ましくは３〜１５重量％である。また、表層用樹脂のＣＸＳは、基材層用樹脂のＣＸＳより多いことが好ましい。 The 20 ° C. xylene soluble part amount (CXS) of the resin for the surface layer is 1% by weight or more, and preferably 2 to 20% by weight, more preferably 3 to 15% by weight from the viewpoint of the bleeding property of the lubricant and the stickiness of the film. %. Further, the CXS of the surface layer resin is preferably larger than the CXS of the base layer resin.
表層用樹脂のＭＦＲは１〜２０ｇ／１０分であり、より好ましくは２〜１５ｇ／１０分であり、さらに好ましくは３〜１０ｇ／１０分である。１ｇ／１０分未満や２０ｇ／１０分を超える場合、きれいに積層できないことがある。 The MFR of the surface layer resin is 1 to 20 g / 10 minutes, more preferably 2 to 15 g / 10 minutes, and further preferably 3 to 10 g / 10 minutes. If it is less than 1 g / 10 minutes or exceeds 20 g / 10 minutes, it may not be possible to laminate cleanly.
本発明で用いられる滑剤は、ステアリン酸アミド（融点＝１００−１０５℃）、オレイン酸アミド（融点＝７０−７８℃）、エルカ酸アミド（融点＝７６−８５℃）、ベヘニン酸アミド（融点＝１０５−１１１℃）、メチレンビスステアリン酸アミド（融点＝１４０−１４５℃）などの脂肪酸アミド系滑剤、ポリエチレンワックスなどの炭化水素系滑剤、ステアリン酸カルシウム（融点＝１４５−１６０℃）などの金属石鹸系滑剤が挙げられ、好ましくは脂肪酸アミド系滑剤である。 Lubricants used in the present invention are stearic acid amide (melting point = 100-105 ° C.), oleic acid amide (melting point = 70-78 ° C.), erucic acid amide (melting point = 76-85 ° C.), behenic acid amide (melting point = 105-111 ° C.), fatty acid amide-based lubricants such as methylenebisstearic acid amide (melting point = 140-145 ° C.), hydrocarbon-based lubricants such as polyethylene wax, metal soaps such as calcium stearate (melting point = 145-160 ° C.) Examples of the lubricant include fatty acid amide-based lubricants.
本発明の基材層および表層用樹脂には、必要に応じて添加剤やその他の樹脂を添加してもよい。添加剤としては、例えば、酸化防止剤、紫外線吸収材、帯電防止剤、造核剤、防曇剤、アンチブロッキング剤等が挙げられる。
その他の樹脂としては、ポリエチレン系樹脂や、ポリオレフィン系樹脂が挙げられる。
You may add an additive and other resin to the base material layer and surface layer resin of this invention as needed. Examples of the additive include an antioxidant, an ultraviolet absorber, an antistatic agent, a nucleating agent, an antifogging agent, and an antiblocking agent.
Examples of other resins include polyethylene resins and polyolefin resins.
本発明の基材層用樹脂に含有される滑剤の濃度は、添加剤のブリード性の観点から表層に含有される滑剤の濃度より高くする必要がある。 The concentration of the lubricant contained in the base layer resin of the present invention needs to be higher than the concentration of the lubricant contained in the surface layer from the viewpoint of the bleeding property of the additive.
基材層用樹脂に含有される滑剤濃度は、５００〜１００００ｐｐｍ、好ましくは１０００〜５０００ｐｐｍ、より好ましくは１０００〜４０００ｐｐｍである。５００ｐｐｍ未満では滑り性改良効果が低く、１００００ｐｐｍを超えるとフィルム白化を起こすことがある。 The lubricant concentration contained in the base layer resin is 500 to 10000 ppm, preferably 1000 to 5000 ppm, more preferably 1000 to 4000 ppm. If it is less than 500 ppm, the effect of improving slipperiness is low, and if it exceeds 10,000 ppm, film whitening may occur.
表層用樹脂に含有される滑剤濃度は、１００〜５０００ｐｐｍ、好ましくは１００〜３０００ｐｐｍ、より好ましくは、１００〜２０００ｐｐｍである。１００ｐｐｍ未満では滑り性改良効果が低く、５０００ｐｐｍを超えると製膜時にロール汚れの原因となったり、フィルム白化を起こしたりすることがある。 The concentration of the lubricant contained in the resin for the surface layer is 100 to 5000 ppm, preferably 100 to 3000 ppm, and more preferably 100 to 2000 ppm. If it is less than 100 ppm, the effect of improving slipperiness is low, and if it exceeds 5000 ppm, roll stains may occur during film formation, or film whitening may occur.
本発明の多層フィルムを製造する方法としては、通常用いられる溶融押出法を用いて、Ｔダイ法やインフレーション法によって多層化する方法等が挙げられる。延伸方法としては、例えば、ロール延伸法、テンター延伸法、チューブラー延伸法等により二軸に延伸する方法が挙げられる。 Examples of the method for producing the multilayer film of the present invention include a method of multilayering by a T-die method or an inflation method using a commonly used melt extrusion method. Examples of the stretching method include biaxial stretching methods such as a roll stretching method, a tenter stretching method, and a tubular stretching method.
本発明の多層フィルムは、基材層の両面に表層を設けてもよく、３種３層、２種３層といった構成でもよい。 The multilayer film of the present invention may be provided with a surface layer on both surfaces of the base material layer, or may have a configuration of 3 types, 3 layers, 2 types, 3 layers.
本発明の基材層の厚みは通常１０〜１００μｍであり、表層の厚みは０．１〜２０μｍであり、基材層は表層よりも厚い。 The thickness of the base material layer of the present invention is usually 10 to 100 μm, the thickness of the surface layer is 0.1 to 20 μm, and the base material layer is thicker than the surface layer.
以下、実施例および比較例を用いて、本発明を具体的に説明する。実施例および比較例で用いた試料の調製方法および物性の測定方法を下記に示した。 Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. The sample preparation methods and physical property measurement methods used in Examples and Comparative Examples are shown below.
（１）１−ブテン含有量（単位：重量％）
高分子分析ハンドブック（１９９５年、紀伊国屋書店発行）の第６１９頁に記載されているＩＲスペクトル測定を行い、１−ブテン含有量を求めた。
(1) 1-butene content (unit: wt%)
IR spectrum measurement described on page 619 of Polymer Analysis Handbook (1995, published by Kinokuniya) was performed to determine the 1-butene content.
（２）エチレン含有量（単位：重量％）
高分子分析ハンドブック（１９８５年、朝倉書店発行）の第２５６頁“（ｉ）ランダム共重合体”の項に記載の方法によってＩＲスペクトル法で決定した。
(2) Ethylene content (unit: wt%)
It was determined by the IR spectrum method according to the method described in the paragraph “(i) Random copolymer” on page 256 of the Polymer Analysis Handbook (published by Asakura Shoten in 1985).
（３）２０℃キシレン可溶成分量（ＣＸＳ、単位：重量％）
試料１ｇを沸騰キシレン１００ｍｌに完全に溶解させた後、２０℃に降温し、４時間放置した。その後、これを析出物と溶液とに濾別し、濾液を乾固して減圧下７０℃で乾燥し、残存物を得た。得られた残存物の重量を測定して、２０℃キシレン可溶成分量（ＣＸＳ）を求めた。
(3) 20 ° C. xylene soluble component amount (CXS, unit: wt%)
After 1 g of the sample was completely dissolved in 100 ml of boiling xylene, the temperature was lowered to 20 ° C. and left for 4 hours. Thereafter, this was separated into a precipitate and a solution, and the filtrate was dried and dried at 70 ° C. under reduced pressure to obtain a residue. The weight of the obtained residue was measured to determine the 20 ° C. xylene-soluble component amount (CXS).
（４）メルトフローレート（ＭＦＲ、単位：ｇ／１０分）
ＪＩＳ Ｋ７２１０に従い、温度２３０℃、荷重２１．１８Ｎで測定した。
(4) Melt flow rate (MFR, unit: g / 10 minutes)
According to JIS K7210, the measurement was performed at a temperature of 230 ° C. and a load of 21.18 N.
（５）融点（Ｔｍ、単位：℃）
ペレットを熱プレス成形（２３０℃で５分間予熱後、３分間かけて５０ｋｇｆ/ｃｍ2まで昇圧し２分間保圧した後、３０℃、３０ｋｇｆ/ｃｍ2で５分間冷却）して、厚さ０.５ｍｍのシートを作成した。示差走査型熱量計（パーキンエルマー社製、ＤＳＣ−７型）を用い、作成されたシートの１０ｍｇを窒素雰囲気下２２０℃で５分間熱処理後、降温速度３００℃／分で１５０℃まで冷却し、１５０℃において１分間保温し、さらに降温速度５℃／分で５０℃まで冷却し、５０℃において１分間保温した後、５０℃から１８０℃まで昇温速度５℃／分で加熱した際に得られた融解曲線において、最大吸熱ピークを示す温度（℃）を測定した。
(5) Melting point (Tm, unit: ° C)
The pellets were hot press-molded (preheated at 230 ° C. for 5 minutes, pressured up to 50 kgf / cm 2 over 3 minutes, held for 2 minutes, then cooled at 30 ° C. and 30 kgf / cm 2 for 5 minutes). A sheet of .5 mm was created. Using a differential scanning calorimeter (Perkin Elmer, DSC-7 type), 10 mg of the prepared sheet was heat-treated at 220 ° C. for 5 minutes in a nitrogen atmosphere, and then cooled to 150 ° C. at a temperature decreasing rate of 300 ° C./min. Heated at 150 ° C for 1 minute, further cooled to 50 ° C at a temperature drop rate of 5 ° C / minute, kept at 50 ° C for 1 minute, and then heated from 50 ° C to 180 ° C at a temperature increase rate of 5 ° C / minute. In the obtained melting curve, the temperature (° C.) showing the maximum endothermic peak was measured.
（６）摩擦係数（μｓ、μｋ）
室温２３℃、湿度５０％のもと、ＭＤ１００ｍｍ×ＴＤ７５ｍｍのフィルムサンプル２枚の測定面同士を重ね合わせて、設置面積６３．５ｍｍ×６３．５ｍｍで重量２００ｇの錘を用いてＴＯＹＯＳＥＩＫＩ ＦＲＩＣＴＩＯＮ ＴＥＳＴＥＲ ＴＲ−２型で移動速度１５ｃｍ／分で測定した。
(6) Friction coefficient (μs, μk)
Under a room temperature of 23 ° C. and a humidity of 50%, the measurement surfaces of two film samples of MD100 mm × TD75 mm are overlapped, and a weight of 200 g is used with an installation area of 63.5 mm × 63.5 mm and TOYOSEKI FRICTION TESTER TR- Measurement was performed with a type 2 at a moving speed of 15 cm / min.
（７）ヒートシール温度（ＨＳＴ、単位：℃）
フィルムの表面同士を重ね合わせ、所定の温度に加熱されたヒートシーラー（東洋精機製）で２ｋｇ／ｃｍ2Ｇの荷重で２秒間圧着してヒートシールを行った。このサンプルを一昼夜２３℃、湿度５０％で状態調整した後、２３℃、湿度５０％で剥離速度２００ｍｍ／分、剥離角度１８０度で剥離した時の剥離抵抗力が３００ｇ／２５ｍｍになるシール温度を求め、ヒートシール温度とした。
(7) Heat seal temperature (HST, unit: ° C)
The surfaces of the films were overlapped and heat sealed by press-bonding for 2 seconds under a load of 2 kg / cm 2 G with a heat sealer (manufactured by Toyo Seiki) heated to a predetermined temperature. The sample was conditioned at 23 ° C. and humidity 50% all day and night, and then the seal temperature at which peeling resistance was 300 g / 25 mm when peeled at 23 ° C. and 50% humidity at a peeling rate of 200 mm / min and a peeling angle of 180 degrees. The heat seal temperature was obtained.
（８）透明性 （Ｈａｚｅ、単位：％）
ＪＩＳ Ｋ７１３６に従って測定した。
(8) Transparency (Haze, unit:%)
It measured according to JIS K7136.
［表層用樹脂］
［プロピレン／１−ブテン共重合体の重合］
特開２００４−００２７５９号公報
［００２８］〜［００３１］に記載と同様の方法で１−ブテン含有量が２５重量％のプロピレン／１−ブテン共重合体パウダーを得た。
［表層用樹脂のペレット化］
得られたプロピレン／１−ブテン共重合体のパウダー１００重量部に対して、ハイドロタルサイトＤＨＴ４Ｃ（協和化学工業株式会社製） ０．０１重量部、イルガノックス１０１０（チバスペシャリティーケミカルズ社製） ０．１５重量部、イルガフォス１６８（チバスペシャリティーケミカルズ社製） ０．１０重量部、トスパール１２０（モメンティブ・パフォーマンス・マテリアルズ・ジャパン社製）を混合して溶融混練し、ＭＦＲ＝５．６、Ｔｍ＝１２７℃、ＣＸＳ＝１２重量％のペレットを得た。
[Surface layer resin]
[Polymerization of propylene / 1-butene copolymer]
Propylene / 1-butene copolymer powder having a 1-butene content of 25% by weight was obtained in the same manner as described in JP-A-2004-002759 [0028] to [0031].
[Pelletization of resin for surface layer]
0.01 parts by weight of hydrotalcite DHT4C (manufactured by Kyowa Chemical Industry Co., Ltd.), Irganox 1010 (manufactured by Ciba Specialty Chemicals) based on 100 parts by weight of the propylene / 1-butene copolymer powder 0 .15 parts by weight, Irgaphos 168 (manufactured by Ciba Specialty Chemicals) 0.10 parts by weight, Tospearl 120 (manufactured by Momentive Performance Materials Japan) are mixed and melt-kneaded, MFR = 5.6, Tm = 127 ° C., CXS = 12 wt% pellets were obtained.
［滑剤のマスターバッチ化］
プロピレン／エチレン共重合体（エチレン含有量＝０．６重量％、ＭＦＲ＝３ｇ／１０ｍｉｎ、Ｔｍ＝１５８℃）９５重量％、滑剤５重量％、および該共重合体と滑剤を合わせた１００重量部に対してハイドロタルサイト ０．０１重量部、イルガノックス１０１０（チバスペシャリティーケミカルズ社製） ０．１５重量部を混合して、４０ｍｍφ単軸押出機で溶融混練して滑剤のマスターバッチを得た。滑剤としては、エルカ酸アミド（日本精化株式会社製 ニュートロンＳ、融点＝７０℃）、ステアリン酸アミド（ライオンアクゾ株式会社製 アーマイドＨＴ、融点＝１０３℃））、ベヘニン酸アミド（日本精化株式会社製 ＢＮＴ２２、融点＝１１３℃）を使用した。
[Lubrication master batch]
Propylene / ethylene copolymer (ethylene content = 0.6% by weight, MFR = 3 g / 10 min, Tm = 158 ° C.) 95% by weight, lubricant 5% by weight, and 100 parts by weight of the copolymer and lubricant combined Hydrotalcite 0.01 part by weight and Irganox 1010 (manufactured by Ciba Specialty Chemicals) 0.15 part by weight were mixed and melt-kneaded with a 40 mmφ single screw extruder to obtain a master batch of lubricant. . As the lubricant, erucic acid amide (Nippon Seika Co., Ltd. Neutron S, melting point = 70 ° C.), stearic acid amide (Lion Akzo Co., Ltd. Armide HT, melting point = 103 ° C.), behenic acid amide (Nippon Seika) BNT22 (melting point = 113 ° C.) manufactured by Japan Ltd. was used.
［実施例１］
基材層用樹脂として住友化学社製ＦＳ２０１１ＤＧ３（ＭＦＲ＝２．５ｇ／１０ｍｉｎ、Ｔｍ＝１５８℃、ＣＸＳ＝３．０重量％）にエルカ酸アミドのマスターバッチをエルカ酸アミド濃度が１５００ｐｐｍとなるようにブレンドして用いた。
表層用樹脂としては、上記［００３１］で得たプロピレン／１−ブテン共重合体のペレットにステアリン酸アミドのマスターバッチをステアリン酸アミド濃度が１０００ｐｐｍとなるようにブレンドして使用した。
[Example 1]
A master batch of erucamide is added to FS2011DG3 (MFR = 2.5 g / 10 min, Tm = 158 ° C., CXS = 3.0 wt%) manufactured by Sumitomo Chemical Co., Ltd. as a base layer resin so that the erucamide concentration is 1500 ppm. It was used after blending.
As the surface layer resin, the propylene / 1-butene copolymer pellets obtained in the above [0031] were blended with a master batch of stearamide so that the stearamide concentration was 1000 ppm.
［二軸延伸フィルムの作成］
６５ｍｍφ（基材層）、５０ｍｍφ（表層）のスクリューを有する多層Ｔダイ押出機を用いて、基材層用樹脂は２６０℃、表層用樹脂は２４０℃でそれぞれ溶融押出を行い、次いで３０℃の冷却ロールで急冷してシートを得た。このシートを１２０℃で加熱しながら縦延伸機のロール周速差（低速ロールは５ｍ／ｍｉｎ、高速ロールは２５ｍ／ｍｉｎ）により縦方向に５倍延伸し、次いで加熱炉にて延伸温度１５７℃で横方向に８倍延伸した後、１６５℃で６．５％の緩和処理を行った。上記手法により基材層２０μｍ、表層１．５μｍの二軸延伸フィルムを得た。該フィルムの物性を表１に示した。フィルム物性は加工直後の２３℃における滑り、加工後４０℃のオーブン内で１日エージングした後の２３℃における滑り、加工後４０℃のオーブン内でエージングした後の６０℃における滑り（μｓ、μｋ）を測定した。
[Creation of biaxially stretched film]
Using a multilayer T-die extruder having screws of 65 mmφ (base layer) and 50 mmφ (surface layer), the base layer resin was melt extruded at 260 ° C. and the surface layer resin was melted at 240 ° C., and then 30 ° C. The sheet was obtained by quenching with a cooling roll. While this sheet is heated at 120 ° C., it is stretched 5 times in the machine direction by a roll peripheral speed difference of a longitudinal stretching machine (low speed roll is 5 m / min, high speed roll is 25 m / min), and then stretched at a heating temperature of 157 ° C. in a heating furnace. Then, the film was stretched 8 times in the transverse direction and then subjected to a relaxation treatment of 6.5% at 165 ° C. A biaxially stretched film having a substrate layer of 20 μm and a surface layer of 1.5 μm was obtained by the above method. The physical properties of the film are shown in Table 1. The film properties were as follows: slip at 23 ° C. immediately after processing, slip at 23 ° C. after aging in an oven at 40 ° C. after processing, slip at 60 ° C. after aging in an oven at 40 ° C. after processing (μs, μk) ) Was measured.
［実施例２］
表層用樹脂の滑剤としてベヘニン酸アミド１０００ｐｐｍとした以外は実施例１と同様の方法で二軸延伸フィルムを作成した。
[Example 2]
A biaxially stretched film was prepared in the same manner as in Example 1 except that behenic acid amide was 1000 ppm as the lubricant for the surface layer resin.
［実施例３］
表層用樹脂の滑剤としてベヘニン酸アミド５００ｐｐｍとした以外は実施例１と同様の方法で二軸延伸フィルムを作成した。
[Example 3]
A biaxially stretched film was prepared in the same manner as in Example 1 except that 500 ppm of behenic acid amide was used as the lubricant for the surface layer resin.
［比較例１］ [Comparative Example 1]
基材層用樹脂の滑剤としてベヘニン酸アミド１５００ｐｐｍ、表層用樹脂の滑剤としてエルカ酸アミド１０００ｐｐｍとした以外は実施例１と同様の方法で二軸延伸フィルムを作成した。得られたフィルムは加工直後、およびエージング後の滑り性が劣っていた。 A biaxially stretched film was prepared in the same manner as in Example 1 except that 1500 ppm of behenic acid amide was used as the lubricant for the base layer resin and 1000 ppm of erucic acid amide was used as the lubricant for the surface layer resin. The obtained film was inferior in slippery immediately after processing and after aging.
［比較例２］
基材層用樹脂の滑剤としてステアリン酸アミド１５００ｐｐｍ、表層用樹脂の滑剤としてエルカ酸アミド１０００ｐｐｍとした以外は実施例１と同様の方法で二軸延伸フィルムを作成した。得られたフィルムは加工直後、およびエージング後の滑り性が劣っていた。
[Comparative Example 2]
A biaxially stretched film was produced in the same manner as in Example 1 except that stearic acid amide was 1500 ppm as the base layer resin lubricant and erucic acid amide was 1000 ppm as the surface layer resin lubricant. The obtained film was inferior in slippery immediately after processing and after aging.
［比較例３］
基材層用樹脂の滑剤としてエルカ酸アミド１５００ｐｐｍ、表層用樹脂の滑剤としてエルカ酸アミド１０００ｐｐｍとした以外は実施例１と同様の方法で二軸延伸フィルムを作成した。得られたフィルムは加工直後の滑り性とエージング後の６０℃での滑り性が劣っていた。
[Comparative Example 3]
A biaxially stretched film was prepared in the same manner as in Example 1 except that 1500 ppm of erucamide was used as the lubricant for the base layer resin and 1000 ppm of erucamide was used as the lubricant for the surface layer resin. The obtained film was inferior in slipperiness immediately after processing and slipperiness at 60 ° C. after aging.
［比較例４］
基材層用樹脂の滑剤としてエルカ酸アミド１３５０ｐｐｍ、表層用樹脂の滑剤としてステアリン酸アミド３０００ｐｐｍとした以外は実施例１と同様の方法で製膜を試みたが、溶融押出後の冷却ロールへの密着性が悪く、横延伸時に膜割れを起こし、フィルムが得られなかった。
[Comparative Example 4]
Film formation was attempted in the same manner as in Example 1 except that 1350 ppm of erucamide was used as the lubricant for the base layer resin and 3000 ppm of stearamide was used as the lubricant for the surface layer resin. Adhesion was poor, film cracking occurred during transverse stretching, and no film was obtained.
［比較例５］
基材層用樹脂の滑剤としてエルカ酸アミド１３５０ｐｐｍ、ステアリン酸アミド２０００ｐｐｍとした以外は実施例１と同様の方法で二軸延伸フィルムを作成した。得られたフィルムは加工直後の滑り性とエージング後の６０℃での滑り性が劣っていた。
[Comparative Example 5]
A biaxially stretched film was prepared in the same manner as in Example 1 except that 1350 ppm of erucic acid amide and 2000 ppm of stearic acid amide were used as the lubricant for the base layer resin. The obtained film was inferior in slipperiness immediately after processing and slipperiness at 60 ° C. after aging.
本発明の要件を満足する層構成を有する多層フィルムは、低温ヒートシール性に優れると共に、加工直後の滑り性、エージング後の滑り性のバランスにも優れる。一方、本発明の要件を満足しない多層フィルムは加工直後の滑り性が不十分であったり、エージング後の滑り性が不十分であったりすることがわかる。 A multilayer film having a layer structure that satisfies the requirements of the present invention is excellent in low-temperature heat-sealing properties, and is also excellent in the balance between slip properties immediately after processing and slip properties after aging. On the other hand, it can be seen that a multilayer film that does not satisfy the requirements of the present invention has insufficient sliding properties immediately after processing or insufficient sliding properties after aging.
Claims (3)
融点が１５０℃未満であり、２０℃キシレン可溶部量（ＣＸＳ）が１％以上であるプロピレン系重合体を含む表層と、
からなる多層フィルムであって、基材層と表層はそれぞれ異なる滑剤を含有し、基材層の滑剤濃度が表層の滑剤濃度より高く、基材層に含有される滑剤の融点が表層に含有される滑剤の融点より低いことを特徴とする多層フィルム。 A base material layer containing a propylene-based polymer having a melting point of 150 ° C. or higher and a 20 ° C. xylene-soluble part amount (CXS) of 1% or more;
A surface layer containing a propylene-based polymer having a melting point of less than 150 ° C. and a 20 ° C. xylene-soluble part amount (CXS) of 1% or more;
The base material layer and the surface layer contain different lubricants, the base material layer has a higher lubricant concentration than the surface layer lubricant, and the base material layer has the melting point of the lubricant contained in the surface layer. A multilayer film characterized by being lower than the melting point of the lubricant.
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| JP2975631B2 (en) * | 1990-03-28 | 1999-11-10 | モービル・オイル・コーポレーシヨン | Multi-layer heat-sealable polypropylene film |
| JPH11334004A (en) * | 1998-03-26 | 1999-12-07 | Idemitsu Petrochem Co Ltd | Polypropylene multilayered film and composite film |
| JP2000080218A (en) * | 1998-09-04 | 2000-03-21 | Idemitsu Petrochem Co Ltd | Polypropylene resin composition and its film |
| JP2006520274A (en) * | 2002-12-16 | 2006-09-07 | クライオバツク・インコーポレイテツド | Polymer film with low adhesion and high slip properties |
| JP2006327183A (en) * | 2005-04-28 | 2006-12-07 | Toyobo Co Ltd | Heat-sealable laminated polypropylene based resin film and package |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2975631B2 (en) * | 1990-03-28 | 1999-11-10 | モービル・オイル・コーポレーシヨン | Multi-layer heat-sealable polypropylene film |
| JPH11334004A (en) * | 1998-03-26 | 1999-12-07 | Idemitsu Petrochem Co Ltd | Polypropylene multilayered film and composite film |
| JP2000080218A (en) * | 1998-09-04 | 2000-03-21 | Idemitsu Petrochem Co Ltd | Polypropylene resin composition and its film |
| JP2006520274A (en) * | 2002-12-16 | 2006-09-07 | クライオバツク・インコーポレイテツド | Polymer film with low adhesion and high slip properties |
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| JP7473347B2 (en) | 2020-01-31 | 2024-04-23 | 三井化学東セロ株式会社 | Laminated film, packaging material, and packaging body |
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