JP2004345136A - Polypropylene resin film and package - Google Patents

Polypropylene resin film and package Download PDF

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Publication number
JP2004345136A
JP2004345136A JP2003142446A JP2003142446A JP2004345136A JP 2004345136 A JP2004345136 A JP 2004345136A JP 2003142446 A JP2003142446 A JP 2003142446A JP 2003142446 A JP2003142446 A JP 2003142446A JP 2004345136 A JP2004345136 A JP 2004345136A
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JP
Japan
Prior art keywords
layer
heat
resin film
matte
polypropylene resin
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.)
Pending
Application number
JP2003142446A
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Japanese (ja)
Inventor
Kenji Kawai
兼次 河井
Sukekazu Oki
祐和 大木
Tadashi Nakatani
伊志 中谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyobo Co Ltd
Original Assignee
Toyobo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Priority to JP2003142446A priority Critical patent/JP2004345136A/en
Publication of JP2004345136A publication Critical patent/JP2004345136A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a matte polypropylene resin film having heat-sealing strength, a good matte feeling and a stiffness feeling and showing good appearance at the time of commodity display after packaging, and a package using it. <P>SOLUTION: This biaxially stretched laminated polypropylene resin film is constituted by successively laminating a matte layer (A) to which matting treatment is applied, an intermediate layer (B) and a heat sealing layer (C) with a melting point of 150°C or below and characterized in that the thickness μa of the matte layer (A), the thickness μb of the intermediate layer (B) and the thickness μc of the heat sealing layer (C) satisfy the relation: μb≥2(μa+μc)μc>μa. The resin constituting the intermediate layer (B) contains at least a part of the resins constituting the matte layer (A) and the heat sealing layer (C). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、ヒートシール性が良好なマット調ポリプロピレン系樹脂フイルム及び包装体に関し、さらに詳しくは、包装用フイルムとして商品の外観に高級感を持たせることができる程、風合いのよい低光沢マット感と自動包装可能なヒートシール性を有したポリプロピレン二軸延伸複合フイルムに関する。
【0002】
【従来の技術】
従来から、包装用に使用するヒートシーラブルフイルムとしては、一般的に、ポリプロピレン系樹脂に低融点のポリオレフィン系樹脂を積層した共押出し積層ポリプロピレン系樹脂フイルム、無延伸ポリエチレン系樹脂フイルム又はポリプロピレン系樹脂フイルムと延伸ポリプロピレン系樹脂フイルムとをラミネートした積層ポリプロピレン系樹脂フイルムが多用されている。
【0003】
また、一部の用途では、商品の外観に高級感を持たせることができる包装フイルムとして、風合いのよい低光沢マット調(艶消し)のポリプロピレン二軸延伸フイルムが好まれて使用されている(例えば、特許文献1参照)。
【0004】
また、溶断シール性とスリップ性を併せ持ったマット調の無延伸ポリオレフィンフイルムが提案されている(例えば、特許文献2参照。)が、二軸延伸フイルムの持つ腰感とマット調の外観、ヒートシール性を併せ持つフイルム及び包装体というのは知られていなかった。
【0005】
【特許文献1】
特開平11−129414号公報
【特許文献1】
特開2003−55509号公報
【0006】
【発明が解決しようとする課題】
本発明は、上記従来の積層ポリプロピレン系フイルムの有する問題点を解決し、ヒートシール強度を有し、マット感が良好で、腰感があり包装後の商品陳列時に見栄えのよいマット調ポリプロピレン系樹脂フイルム及びかかるフイルムを用いてなる包装体を提供することを目的とする。
【0007】
【課題を解決するための手段】
上記目的を達成するため、本発明のポリプロピレン系樹脂フイルムは艶消し処理の施されたマット層(A)、中間層(B)及び融点が150℃以下の熱融着層(C)が順に積層されてなる積層2軸延伸ポリプロピレン系樹脂フイルムであって、マット層(A)の厚みμaと中間層(B)の厚みμbと熱融着層(C)の厚みμcが以下の関係を満足することを特徴とし、
μb≧2(μa+μc)
μc>μa
中間層(B)を構成する樹脂として、マット層(A)及び熱融着層(C)を構成する樹脂を少なくともそれぞれ1種類以上含有することを特徴とする。
【0008】
この場合において、前記中間層(B)に含有するマット層(A)及び熱融着層(C)を構成する樹脂の含有量が2重量部以上であることが好適である。
【0009】
また、この場合において、前記ポリプロピレン系樹脂フイルムをもちいてなる包装体が好適である。
【0010】
【発明の実施の形態】
以下、本発明の以下、本発明のマット調ポリプロピレン系樹脂フイルム及び包装体の実施の形態を説明する。
【0011】
本発明において、表層に設けたマット層(A)を、マット化する方法としては、特に限定されるものではないが、マット層を構成する樹脂としてプロピレンと他ポリマーとのブロック共重合体を用い、フイルム製膜の過程で表面を粗し、艶消し効果を出すようにした方法を用いることが好ましい。
【0012】
また、本発明において、熱融着層Cに用いる樹脂は融点が150℃以下の熱可塑性樹脂であって、エチレン、プロピレン、ブテン、ペンテン、ヘキセン、オクテン、デセン等の炭素数が2〜10のα−オレフィン系モノマーから選ばれた2種以上を重合して得たランダム共重合体又はブロック共重合体が好ましく、また、この共重合体は単独又は混合して使用することができる。
【0013】
さらにまた、熱融着層Cを形成する熱可塑性樹脂の融点は150℃以下、好ましくは60〜150℃にすることが望ましい。このようにすることにより、ヒートシール性積層ポリプロピレン系樹脂フイルムに十分なヒートシール強度を与えることができる。熱融着層Cを形成する熱可塑性樹脂の融点が60℃未満ではヒートシール部の耐熱性が乏しく、150℃を越えるとヒートシール強度の向上が期待できない。
【0014】
中間層Bを形成する樹脂は、マット層A及び熱融着層Cに使用する樹脂をそれぞれ1種類以上含有する事が必要である。
ここでマット層Aに使用する樹脂を含有しない場合は、ヒートシールした際にヒートシールした部分の艶消し調の外観が消失してしまうという不具合が発生する。また、熱融着層Cに使用する樹脂を含有しない場合は、中間層Bと熱融着層Cの間で層間剥離が発生しやすくなり、十分なシール強度が得られないという不具合が発生する。
【0015】
それぞれの好ましい配合量としては、2〜40重量部であり、2重量部未満では十分な効果が得られず、40重量部を越える場合は腰が低下する等の不具合が発生するので好ましくない。
【0016】
本発明において、各層を形成する樹脂には、必要に応じて各層の特性を阻害しない範囲で、各種添加材、充填材、例えば、熱安定剤、酸化防止剤、光安定剤、帯電防止剤、滑剤、核剤、難燃剤、顔料、染料、炭酸カルシウム、硫酸バリウム、水酸化マグネシウム、マイカ、タルク、クレー等を添加することができる。さらにまた、その他の熱可塑性樹脂、熱可塑性エラストマー、ゴム類、炭化水素樹脂、石油樹脂等を本発明のフイルムの特性を害さない範囲で配合してもよい。
【0017】
本発明のマット調ポリプロピレン系樹脂フイルムの各層の厚み構成は、次式を満足する必要がある。
μb≧2(μa+μc)
μc>μa
ここで、μaはマット層(A)の厚み、μbは中間層(B)の厚み、μcは熱融着層(C)の厚みを意味する。
μb<2(μa+μc)の場合は、十分な腰感が得られない問題が発生し、取り扱い上、好ましくない。
また、μc≦μaの場合は、十分なシール強度が得られない問題が発生する。さらに好ましい各層の厚みは、マット層(A)は0.1〜5.0μm、熱融着層(C)は0.5〜10.0μm、中間層(B)は8〜100μmを例示することができる。
【0018】
本発明のポリプロピレン系樹脂フイルムはそれ自体公知の方法で任意に製造することができ、特に制限するものではない。例えば、積層数に見合う押出し機を用いてTダイ法又はインフレーション法等で溶融積層した後、冷却ロール法、水冷法又は空冷法で冷却して積層フイルムとし、逐次2軸延伸法、同時2軸延伸法、チューブ延伸法等で延伸する方法を例示することができる。
【0019】
本発明のポリプロピレン系樹脂フイルムは、マット層Aの表面に他の樹脂層、例えば、エチレン−酢酸ビニル共重合体けん化物、ポリビニルアルコール等のガスバリア性樹脂層をマット感を失わない範囲で積層してもよく、また、マット層Aと中間層Bの間、中間層Bと熱融着層Cの間に同様に積層することも、その特性を害さない限り、特に制限されない。
【0020】
本発明のポリプロピレン系樹脂フイルムは、印刷性、ラミネート性等を向上させるために表面処理を行うことができる。表面処理の方法としては、コロナ放電処理、プラズマ処理、火炎処理、酸処理等が例示でき、特に制限はない。連続処理が可能であり、このフイルムの製造過程の巻き取り工程前に容易に実施できるコロナ放電処理、プラズマ処理、火炎処理を行うのが好ましい。
【0021】
本発明のポリプロピレン系樹脂フイルムは、マット調を有し尚且つヒートシール性が必要な用途、小麦粉、米、麦などの穀物類やシュークリーム等のケーキ類、食パン、菓子パン等のパン類、焼き菓子類などの包装材料として好適であり、また、これらは、ペーパーカートン、チューブ用、袋用、カップ用、スタンディングパック用、トレイ用などの包装体として用いることができる。
【0022】
【実施例】
以下、本発明の具体例を実施例によってさらに説明するが、本発明は、その要旨を逸脱しない限り以下の実施例に限定されるものではない。なお、本明細書中における特性は下記の方法により評価をおこなった。
【0023】
(ヒートシール強度)
ヒートシール温度140℃、圧力1kg/cm、ヒートシール時間1秒の条件で、積層フイルムの熱融着層C面同士を重ね合わせて熱板シールを行い、15mm幅の試験片を作製した。この試験片の180度剥離強度を測定し、ヒートシール強度(N/15mm)とした。
【0024】
(腰:5%伸張時の応力)
ASTM D882に準拠し、TD方向の5%伸張時の応力を測定した。
【0025】
(光沢度)
ASTM D2457に準拠して測定した。
【0026】
(実施例1)
3台の溶融押出機を用い、第1の押出機にてエチレン・プロピレンブロック共重合体(MFR6.5g/10分、融点159℃、エチレン含量7.8重量%)を50重量%、プロピレン・エチレンランダム共重合体(MFR1.7g/10分、融点135℃、エチレン含量5.0重量%)を50重量%とした混合樹脂をマット層(A)として、第2の押出機に、プロピレン・エチレン・ブテンランダム共重合体(MFR4.6g/10分、融点128℃)を50重量%、プロピレン・ブテンランダム共重合体(MFR9.0g/10分、融点130℃)を50重量%とした混合樹脂を熱融着層(C)として、第3の押出機にて、マット層(A)で用いた混合樹脂を3重量%、熱融着層(C)で用いた混合樹脂を5重量%、プロピレン単独重合体(MFR2.5g/10分、融点157℃)を92重量%とした混合樹脂を中間層Bとして、ダイス内にて基材層A/中間層B/熱融着層Cとなるように、基材層A、中間層B、熱融着層Cの順にTダイ方式にて溶融共押出し後、チルロールにて冷却固化し、縦方向に4.5倍、横方向に8倍延伸し、マット層A、中間層B、熱融着層Cの厚みがそれぞれ順に3μm、22μm、5μmである積層フイルムを得た。得られた積層フイルムは本発明の要件を満足するものであり、十分なヒートシール強度と腰感、マット感を有するものであった。
【0027】
(比較例1)
マット層A、中間層B、熱融着層Cの厚みがそれぞれ順に5μm、22μm、3μmである以外は、実施例1と同様にして積層フイルムを得た。得られた積層フイルムは、熱融着層の厚みが低く、シール強度が劣るものであった。
【0028】
(比較例2)
マット層A、中間層B、熱融着層Cの厚みがそれぞれ順に3μm、15μm、14μmである以外は、実施例1と同様にして積層フイルムを得た。得られた積層フイルムは、中間層の厚み比が低く、腰がなく、製袋実包品の取り扱い性も悪いものであった。
【0029】
(比較例3)
中間層Bに用いる樹脂として、実施例1で用いたプロピレン単独重合体のみを用いた以外は、実施例1と同様にして積層フイルムを得た。得られた積層フイルムは、マット感及びシール性が劣るものであった。
【0030】
【表1】

Figure 2004345136
【発明の効果】
本発明のポリプロピレン系樹脂フイルムによれば、十分なヒートシール強度を有し、腰感が良好で、良好な艶消し調の外観を有する包装用途に好適なフイルムとして用いることができる。
【0031】
本発明の包装体によれば、十分なヒートシール強度を有し、腰感が良好で、良好な艶消し調の外観を有する包装体とすることができる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mat-like polypropylene resin film and a package having good heat-sealing properties, and more particularly, to a low-gloss matte texture having such a good texture that the appearance of a product can be given a high-grade appearance as a packaging film. And a heat-sealing polypropylene biaxially stretched composite film that can be automatically packaged.
[0002]
[Prior art]
Conventionally, as a heat sealable film used for packaging, generally, a co-extruded laminated polypropylene resin film in which a low melting point polyolefin resin is laminated on a polypropylene resin, a non-oriented polyethylene resin film or a polypropylene resin. A laminated polypropylene resin film obtained by laminating a film and a stretched polypropylene resin film is often used.
[0003]
In some applications, a biaxially oriented polypropylene biaxially stretched film having a low gloss matte (matte) with a good texture is used as a packaging film capable of giving a high-grade appearance to the product ( For example, see Patent Document 1).
[0004]
In addition, a mat-like unstretched polyolefin film having both fusing seal property and slip property has been proposed (see, for example, Patent Document 2). Films and packages having both properties have not been known.
[0005]
[Patent Document 1]
JP-A-11-129414 [Patent Document 1]
JP 2003-55509 A
[Problems to be solved by the invention]
The present invention solves the problems of the above-mentioned conventional laminated polypropylene film, has heat sealing strength, has a good matt feeling, has a firm feeling, and has a good matt-like polypropylene-based resin when displayed after packaging. An object of the present invention is to provide a film and a package using the film.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the matte layer (A), the intermediate layer (B), and the heat sealing layer (C) having a melting point of 150 ° C. or less are laminated in order on the polypropylene resin film of the present invention. The laminated biaxially stretched polypropylene resin film thus obtained, wherein the thickness μa of the mat layer (A), the thickness μb of the intermediate layer (B), and the thickness μc of the heat sealing layer (C) satisfy the following relationship. Characterized in that
μb ≧ 2 (μa + μc)
μc> μa
As a resin constituting the intermediate layer (B), at least one kind of resin constituting the mat layer (A) and the resin constituting the heat sealing layer (C) is contained.
[0008]
In this case, the content of the resin constituting the mat layer (A) and the heat-sealing layer (C) contained in the intermediate layer (B) is preferably at least 2 parts by weight.
[0009]
In this case, a package using the polypropylene resin film is preferable.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the mat-like polypropylene resin film and the package of the present invention will be described below.
[0011]
In the present invention, the method of forming the mat layer (A) provided on the surface layer into a mat is not particularly limited, but a block copolymer of propylene and another polymer is used as a resin constituting the mat layer. It is preferable to use a method in which the surface is roughened in the process of film formation to give a matte effect.
[0012]
In the present invention, the resin used for the heat-sealing layer C is a thermoplastic resin having a melting point of 150 ° C. or less, and has a carbon number of 2 to 10 such as ethylene, propylene, butene, pentene, hexene, octene, and decene. A random copolymer or a block copolymer obtained by polymerizing two or more kinds selected from α-olefin-based monomers is preferable, and this copolymer can be used alone or as a mixture.
[0013]
Further, the melting point of the thermoplastic resin forming the heat-sealing layer C is desirably 150 ° C. or less, preferably 60 to 150 ° C. By doing so, sufficient heat seal strength can be given to the heat sealable laminated polypropylene resin film. If the melting point of the thermoplastic resin forming the heat-sealing layer C is less than 60 ° C., the heat resistance of the heat-sealed portion is poor, and if it exceeds 150 ° C., improvement in heat-sealing strength cannot be expected.
[0014]
It is necessary that the resin forming the intermediate layer B contains at least one resin for the mat layer A and the resin used for the heat sealing layer C.
Here, when the resin used for the mat layer A is not contained, there occurs a problem that the matte appearance of the heat-sealed portion disappears when heat-sealed. When the resin used for the heat-sealing layer C is not contained, delamination tends to occur between the intermediate layer B and the heat-sealing layer C, which causes a problem that sufficient sealing strength cannot be obtained. .
[0015]
The preferred amount of each component is 2 to 40 parts by weight. If the amount is less than 2 parts by weight, a sufficient effect cannot be obtained. If the amount exceeds 40 parts by weight, problems such as lowering of the waist occur, which is not preferable.
[0016]
In the present invention, in the resin forming each layer, various additives and fillers, for example, a heat stabilizer, an antioxidant, a light stabilizer, an antistatic agent, as long as the properties of each layer are not impaired as necessary. Lubricants, nucleating agents, flame retardants, pigments, dyes, calcium carbonate, barium sulfate, magnesium hydroxide, mica, talc, clay and the like can be added. Furthermore, other thermoplastic resins, thermoplastic elastomers, rubbers, hydrocarbon resins, petroleum resins and the like may be blended within a range that does not impair the properties of the film of the present invention.
[0017]
The thickness configuration of each layer of the mat-like polypropylene resin film of the present invention must satisfy the following expression.
μb ≧ 2 (μa + μc)
μc> μa
Here, μa means the thickness of the mat layer (A), μb means the thickness of the intermediate layer (B), and μc means the thickness of the heat sealing layer (C).
In the case of μb <2 (μa + μc), a problem occurs that a sufficient waist feeling cannot be obtained, which is not preferable in handling.
Further, when μc ≦ μa, there arises a problem that a sufficient sealing strength cannot be obtained. More preferably, the thickness of each layer is, for example, 0.1 to 5.0 μm for the mat layer (A), 0.5 to 10.0 μm for the heat sealing layer (C), and 8 to 100 μm for the intermediate layer (B). Can be.
[0018]
The polypropylene resin film of the present invention can be arbitrarily produced by a method known per se, and is not particularly limited. For example, using an extruder suitable for the number of laminations, melt-lamination by T-die method or inflation method, etc., then cool by cooling roll method, water cooling method or air cooling method to form a laminated film, sequential biaxial stretching method, simultaneous biaxial A method of stretching by a stretching method, a tube stretching method or the like can be exemplified.
[0019]
The polypropylene resin film of the present invention is obtained by laminating another resin layer, for example, a saponified ethylene-vinyl acetate copolymer, a gas barrier resin layer such as polyvinyl alcohol on the surface of the mat layer A within a range that does not lose the matte feeling. Also, the lamination between the mat layer A and the intermediate layer B and between the intermediate layer B and the heat-sealing layer C are not particularly limited as long as their properties are not impaired.
[0020]
The polypropylene resin film of the present invention can be subjected to a surface treatment to improve printability, laminability, and the like. Examples of the surface treatment method include, but are not particularly limited to, corona discharge treatment, plasma treatment, flame treatment, and acid treatment. It is preferable to perform a corona discharge treatment, a plasma treatment, and a flame treatment which can be continuously performed and can be easily performed before the winding step in the film manufacturing process.
[0021]
The polypropylene resin film of the present invention has a matte tone and is required to have heat-sealing properties. It is suitable as a packaging material for products such as paper cartons, tubes, bags, cups, standing packs, trays, and the like.
[0022]
【Example】
Hereinafter, specific examples of the present invention will be further described with reference to examples, but the present invention is not limited to the following examples unless departing from the gist thereof. The properties in the present specification were evaluated by the following methods.
[0023]
(Heat seal strength)
Under the conditions of a heat seal temperature of 140 ° C., a pressure of 1 kg / cm 2 , and a heat seal time of 1 second , the heat-sealed layers C of the laminated film were overlapped with each other to perform hot plate sealing, thereby producing a test piece having a width of 15 mm. The 180-degree peel strength of this test piece was measured and defined as heat seal strength (N / 15 mm).
[0024]
(Waist: stress at 5% extension)
According to ASTM D882, the stress at 5% elongation in the TD direction was measured.
[0025]
(Glossiness)
It was measured according to ASTM D2457.
[0026]
(Example 1)
Using three melt extruders, the first extruder used an ethylene / propylene block copolymer (MFR 6.5 g / 10 min, melting point 159 ° C., ethylene content 7.8% by weight) to obtain 50% by weight of propylene. As a mat layer (A), a mixed resin having an ethylene random copolymer (MFR 1.7 g / 10 min, melting point 135 ° C., ethylene content 5.0% by weight) as 50% by weight was used as a mat layer (A). Ethylene / butene random copolymer (MFR 4.6 g / 10 min, melting point 128 ° C.) 50% by weight, and propylene / butene random copolymer (MFR 9.0 g / 10 min, melting point 130 ° C.) 50% by weight Using a resin as a heat-sealing layer (C), a third extruder used 3 wt% of the mixed resin used in the mat layer (A) and 5 wt% of the mixed resin used in the heat-sealing layer (C). , Propylene homopolymerization (MFR 2.5 g / 10 min, melting point: 157 ° C.) 92% by weight as a mixed resin, and the base layer B was formed such that the base layer A / intermediate layer B / heat-fused layer C was formed in a die. The material layer A, the intermediate layer B, and the heat-sealing layer C are melt-coextruded in the order of the T-die, then solidified by cooling with a chill roll, and stretched 4.5 times in the vertical direction and 8 times in the horizontal direction to obtain a mat layer. A, a middle layer B, and a laminated film having a thickness of 3 μm, 22 μm, and 5 μm, respectively, of the heat-sealing layer C were obtained in this order. The obtained laminated film satisfied the requirements of the present invention, and had sufficient heat seal strength, stiffness, and matte feeling.
[0027]
(Comparative Example 1)
A laminated film was obtained in the same manner as in Example 1, except that the thicknesses of the mat layer A, the intermediate layer B, and the heat sealing layer C were 5 μm, 22 μm, and 3 μm, respectively. In the obtained laminated film, the thickness of the heat-sealing layer was low, and the sealing strength was poor.
[0028]
(Comparative Example 2)
A laminated film was obtained in the same manner as in Example 1 except that the thicknesses of the mat layer A, the intermediate layer B, and the heat sealing layer C were 3 μm, 15 μm, and 14 μm, respectively. The obtained laminated film had a low thickness ratio of the intermediate layer, had no stiffness, and had poor handleability of the actual package.
[0029]
(Comparative Example 3)
A laminated film was obtained in the same manner as in Example 1, except that only the propylene homopolymer used in Example 1 was used as the resin used for the intermediate layer B. The obtained laminated film was inferior in matte feeling and sealability.
[0030]
[Table 1]
Figure 2004345136
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the polypropylene-type resin film of this invention, it has sufficient heat-sealing strength, and it can be used as a film suitable for packaging use which has a good feeling of stiffness and a good matte appearance.
[0031]
ADVANTAGE OF THE INVENTION According to the package of this invention, it has sufficient heat-sealing intensity | strength, the waist feeling is favorable, and it can be set as the package which has a favorable matte appearance.

Claims (3)

艶消し処理の施されたマット層(A)、中間層(B)及び融点が150℃以下の熱融着層(C)が順に積層されてなる積層2軸延伸ポリプロピレン系樹脂フイルムであって、マット層(A)の厚みμaと中間層(B)の厚みμbと熱融着層(C)の厚みμcが以下の関係を満足することを特徴とし、
μb≧2(μa+μc)
μc>μa
中間層(B)を構成する樹脂として、マット層(A)及び熱融着層(C)を構成する樹脂を少なくともそれぞれ1種類以上含有することを特徴とするポリプロピレン系樹脂フイルム。
A laminated biaxially stretched polypropylene resin film in which a matte layer (A), an intermediate layer (B), and a heat-fused layer (C) having a melting point of 150 ° C. or less, which have been subjected to a matting treatment, are sequentially laminated. The thickness μa of the mat layer (A), the thickness μb of the intermediate layer (B), and the thickness μc of the heat sealing layer (C) satisfy the following relationship,
μb ≧ 2 (μa + μc)
μc> μa
A polypropylene-based resin film comprising at least one kind of a resin constituting a mat layer (A) and a resin constituting a heat sealing layer (C) as a resin constituting the intermediate layer (B).
請求項1に記載のポリプロピレン系樹脂フイルムであって、前記中間層(B)に含有するマット層(A)及び熱融着層(C)を構成する樹脂の含有量が2重量部以上であることを特徴とするポリプロピレン系樹脂フイルム。The polypropylene resin film according to claim 1, wherein the content of the resin constituting the mat layer (A) and the heat-sealing layer (C) contained in the intermediate layer (B) is 2 parts by weight or more. A polypropylene resin film characterized by the above-mentioned. 請求項1又は2に記載のポリプロピレン系樹脂フイルムをもちいてなることを特徴とする包装体。A package comprising the polypropylene resin film according to claim 1 or 2.
JP2003142446A 2003-05-20 2003-05-20 Polypropylene resin film and package Pending JP2004345136A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005092612A1 (en) * 2004-03-26 2005-10-06 Toyo Boseki Kabushiki Kaisaha Heat-sealable layered polypropylene resin film and package
WO2006118030A1 (en) * 2005-04-28 2006-11-09 Toyo Boseki Kabushiki Kaisha Heat-sealable multilayer polypropylene resin film and packaging material
US7879439B2 (en) 2004-03-18 2011-02-01 Toyo Boseki Kabushiki Kaisha Polypropylene laminate film, and package comprising the same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7879439B2 (en) 2004-03-18 2011-02-01 Toyo Boseki Kabushiki Kaisha Polypropylene laminate film, and package comprising the same
WO2005092612A1 (en) * 2004-03-26 2005-10-06 Toyo Boseki Kabushiki Kaisaha Heat-sealable layered polypropylene resin film and package
EP1728626A1 (en) * 2004-03-26 2006-12-06 Toyo Boseki Kabushiki Kaisha Heat-sealable layered polypropylene resin film and package
EP1728626A4 (en) * 2004-03-26 2008-04-16 Toyo Boseki Heat-sealable layered polypropylene resin film and package
US9085124B2 (en) 2004-03-26 2015-07-21 Toyo Boseki Kabushiki Kaisha Heat-sealable layered polypropylene resin film and package
WO2006118030A1 (en) * 2005-04-28 2006-11-09 Toyo Boseki Kabushiki Kaisha Heat-sealable multilayer polypropylene resin film and packaging material
US8043712B2 (en) 2005-04-28 2011-10-25 Toyo Boseki Kabushiki Kaisha Heat-sealable multilayer polypropylene resin film and packaging material

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