JPH08197694A - Laminated film for package - Google Patents
Laminated film for packageInfo
- Publication number
- JPH08197694A JPH08197694A JP916195A JP916195A JPH08197694A JP H08197694 A JPH08197694 A JP H08197694A JP 916195 A JP916195 A JP 916195A JP 916195 A JP916195 A JP 916195A JP H08197694 A JPH08197694 A JP H08197694A
- Authority
- JP
- Japan
- Prior art keywords
- ethylene
- polypropylene
- laminated film
- layer
- seal layer
- 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
Links
- -1 polypropylene Polymers 0.000 claims abstract description 27
- 239000004743 Polypropylene Substances 0.000 claims abstract description 24
- 229920001155 polypropylene Polymers 0.000 claims abstract description 24
- 229920001971 elastomer Polymers 0.000 claims abstract description 18
- 239000005060 rubber Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 16
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 15
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 15
- 239000004711 α-olefin Substances 0.000 claims abstract description 15
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims abstract description 10
- 229920001577 copolymer Polymers 0.000 claims abstract description 8
- 238000004806 packaging method and process Methods 0.000 claims description 7
- 229920005604 random copolymer Polymers 0.000 claims description 6
- 238000013329 compounding Methods 0.000 claims 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 abstract description 16
- 239000005977 Ethylene Substances 0.000 abstract description 14
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 abstract description 8
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 abstract description 8
- 238000010030 laminating Methods 0.000 abstract description 3
- 239000000155 melt Substances 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 23
- 238000000034 method Methods 0.000 description 11
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 9
- 229920005672 polyolefin resin Polymers 0.000 description 6
- 235000013305 food Nutrition 0.000 description 5
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 4
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 4
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 4
- 239000005022 packaging material Substances 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- ZGEGCLOFRBLKSE-UHFFFAOYSA-N 1-Heptene Chemical compound CCCCCC=C ZGEGCLOFRBLKSE-UHFFFAOYSA-N 0.000 description 2
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- ZSWFCLXCOIISFI-UHFFFAOYSA-N cyclopentadiene Chemical compound C1C=CC=C1 ZSWFCLXCOIISFI-UHFFFAOYSA-N 0.000 description 2
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 2
- 229920005629 polypropylene homopolymer Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- RRKODOZNUZCUBN-CCAGOZQPSA-N (1z,3z)-cycloocta-1,3-diene Chemical compound C1CC\C=C/C=C\C1 RRKODOZNUZCUBN-CCAGOZQPSA-N 0.000 description 1
- PRBHEGAFLDMLAL-GQCTYLIASA-N (4e)-hexa-1,4-diene Chemical compound C\C=C\CC=C PRBHEGAFLDMLAL-GQCTYLIASA-N 0.000 description 1
- OJOWICOBYCXEKR-KRXBUXKQSA-N (5e)-5-ethylidenebicyclo[2.2.1]hept-2-ene Chemical compound C1C2C(=C/C)/CC1C=C2 OJOWICOBYCXEKR-KRXBUXKQSA-N 0.000 description 1
- YHQXBTXEYZIYOV-UHFFFAOYSA-N 3-methylbut-1-ene Chemical compound CC(C)C=C YHQXBTXEYZIYOV-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
Landscapes
- Wrappers (AREA)
- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、包装用積層フィルムに
関し、より詳細にはポリプロピレンからなる基材層と特
定シール層とを積層してなる食品等の包装に用いる積層
フィルムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film for packaging, and more particularly to a laminated film used for packaging foods and the like, which is obtained by laminating a base material layer made of polypropylene and a specific sealing layer.
【０００２】[0002]
【従来の技術】ポリプロピレン系樹脂やポリエチレン系
樹脂等のポリオレフィン系樹脂製フィルムは、その性質
から食品等の包装材として適しており、広く用いられて
いる。2. Description of the Related Art Films made of polyolefin resins such as polypropylene resins and polyethylene resins are suitable as packaging materials for foods and the like and are widely used.
【０００３】ポリオレフィン系樹脂製フィルムを包装材
として用い、食品等の内容物を密封する手段として、い
わゆるヒートシール法が多く採用されており、この場合
密封された内容物の取り出しは、包装材の端部に設けら
れ切り込みを引き切って行うか、包装材をハサミやナイ
フで切断して行う方法が多く行われており、ヒートシー
ルされた部分を手で剥して（ピール）、取り出すことが
容易に行えることが望ましい。A so-called heat-sealing method is often employed as a means for sealing contents such as foods using a polyolefin resin film as a packing material. In this case, the sealed contents are taken out from the packaging material. It is often done by cutting the notch provided at the end or cutting the packaging material with scissors or a knife. It is easy to remove the heat-sealed part by hand (peel) and take it out. It is desirable to be able to
【０００４】このような包装材には、確実にヒートシー
ルができ、容易にヒートシール部を剥がすことができる
（イージーピール性）という相反する性質が要求され
る。しかし、ポリオレフィン系樹脂単独では、そのよう
な機能を満足させることが困難であるとから、そのよう
な機能を付与するために、ポリプロピレン系樹脂層に他
のポリオレフィン系樹脂層を積層する試みが従来行われ
ている。Such packaging materials are required to have contradictory properties such that they can be surely heat-sealed and the heat-sealed portion can be easily peeled off (easy peeling property). However, since it is difficult to satisfy such a function with a polyolefin resin alone, it has been attempted to laminate another polyolefin resin layer on the polypropylene resin layer in order to impart such a function. Has been done.
【０００５】一般に、ポリオレフィン系樹脂層間のヒー
トシール剥離強度は、温度依存性が強く、シール温度を
上げれば、シール面を剥すにはより大きな力（ピール強
度）を要する傾向にあり、イージーピール性に問題が生
じる。従って、ヒートシール強度を一定に保つために
は、ヒートシール温度を厳密に調整する必要があり、そ
の作業性に難があった。上記従来の試みでは、イージー
ピール性は改良されるものの、温度依存性改善の問題は
依然として残っている。Generally, the heat-seal peel strength between polyolefin resin layers has a strong temperature dependency, and if the seal temperature is raised, a larger force (peel strength) tends to be required to peel off the seal surface, resulting in easy peelability. Causes a problem. Therefore, in order to keep the heat-sealing strength constant, it is necessary to strictly adjust the heat-sealing temperature, which is difficult to work. Although the above-mentioned conventional attempts improve the easy peeling property, the problem of improving the temperature dependence still remains.
【０００６】このような状況下、ヒートシールの作業性
を改良するという意図から、広い温度範囲で変動が少な
く、安定したヒートシール剥離強度を示す積層フィルム
の開発が望まれていた。Under such circumstances, from the intention of improving the workability of heat sealing, it has been desired to develop a laminated film exhibiting stable heat seal peel strength with little fluctuation in a wide temperature range.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、低い温度で
一定のヒートシール剥離強度が得られ、かつ広い温度範
囲において、ヒートシールを行っても、一定のヒートシ
ール剥離強度を持ち、更に、透明性に優れた食品等の包
装用ポリプロピレン系積層フィルムを提供することを目
的とする。DISCLOSURE OF THE INVENTION The present invention provides a constant heat seal peel strength at a low temperature and has a constant heat seal peel strength even when heat sealing is performed in a wide temperature range. An object of the present invention is to provide a polypropylene-based laminated film having excellent transparency for packaging foods and the like.
【０００８】[0008]
【課題を解決するための手段】本発明者らは、鋭意研究
を行った結果、ポリプロピレンよりなる基材層と特定の
ポリオレフィン系樹脂組成物からなるシール層とを積層
してなるフィルムが、本発明の目的を達成し得ることを
見出して本発明を完成した。Means for Solving the Problems As a result of intensive studies, the present inventors have found that a film obtained by laminating a base material layer made of polypropylene and a seal layer made of a specific polyolefin resin composition The present invention has been completed by finding that the object of the invention can be achieved.
【０００９】すなわち、本発明は、ポリプロピレンから
なる基材層とシール層との積層フィルムであり、該シー
ル層はポリプロピレン３０〜５０重量％、低密度ポリエ
チレン２０〜３５重量％及びエチレン−α−オレフィン
重合体ゴム２５〜４０重量％から形成されるものである
包装用積層フィルムを要旨とする。That is, the present invention is a laminated film of a base material layer made of polypropylene and a seal layer, wherein the seal layer is 30 to 50% by weight of polypropylene, 20 to 35% by weight of low density polyethylene and ethylene-α-olefin. The gist is a laminated film for packaging which is formed from 25 to 40% by weight of a polymer rubber.
【００１０】本発明で基材層となるポリプロピレンとし
ては、プロピレンの単独重合体の他、主要部のプロピレ
ンと、エチレン又は炭素数４以上のα−オレフィンとの
ランダム、ブロック共重合体が使用できる。上記α−オ
レフィンとしては、１−ブテン、３−メチル−１−ブテ
ン、１−ヘキセン、４−メチル−１−ペンテン、１−ヘ
プテン、１−オクテン、１−デセン等が挙げられる。こ
れらポリプロピレンは、単独で用いてもよく、２種以上
使用してもよい。As the polypropylene used as the base material layer in the present invention, in addition to a propylene homopolymer, a random or block copolymer of propylene as a main part and ethylene or an α-olefin having 4 or more carbon atoms can be used. . Examples of the α-olefin include 1-butene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene and 1-decene. These polypropylenes may be used alone or in combination of two or more.
【００１１】これらのポリプロピレンは、結晶性のもの
が望ましく、又メルトフローレイト（ＭＦＲ；ＪＩＳ
Ｋ７２１０；荷重２．１６ｋｇ、２３０℃で測定）が
０．５〜３０ｇ／１０分、特に７〜２０ｇ／１０分のも
のが望ましい。These polypropylenes are preferably crystalline, and melt flow rate (MFR; JIS
K7210; load 2.16 kg, measured at 230 ° C.) is preferably 0.5 to 30 g / 10 minutes, particularly 7 to 20 g / 10 minutes.
【００１２】本発明におけるシール層は、ポリプロピレ
ン、低密度ポリエチレン及びエチレン−α−オレフィン
共重合体ゴムから形成される。The seal layer in the present invention is formed of polypropylene, low density polyethylene and ethylene-α-olefin copolymer rubber.
【００１３】ポリプロピレンとしては、前記の基材層と
なるポリプロピレンが挙げられ、その中から適宜選択で
きるが、プロピレンとエチレンとのランダム共重合体が
好ましい。プロピレンとエチレンとのランダム共重合体
としては、エチレン含有量が５重量％以下、好ましくは
２〜５重量％、ＭＦＲが０．５〜３０ｇ／１０分、好ま
しくは７〜２０ｇ／１０分のプロピレン−エチレンラン
ダム共重合体が好ましい。Examples of the polypropylene include the above-mentioned polypropylene that serves as the base material layer and can be appropriately selected from them, but a random copolymer of propylene and ethylene is preferable. The random copolymer of propylene and ethylene has an ethylene content of 5% by weight or less, preferably 2 to 5% by weight, and an MFR of 0.5 to 30 g / 10 minutes, preferably 7 to 20 g / 10 minutes propylene. -Ethylene random copolymers are preferred.
【００１４】低密度ポリエチレンとしては、密度が０．
９１〜０．９３ｇ／ｃｍ3 、メルトインデックス（Ｍ
Ｉ；ＪＩＳ Ｋ７２１０；荷重２．１６ｋｇ，１９０℃
で測定）が０．５〜５０ｇ／１０分のものが使用でき、
特にＭＩが２〜１５ｇ／１０分のものが好ましい。The low density polyethylene has a density of 0.
91 to 0.93 g / cm 3 , melt index (M
I; JIS K7210; load 2.16 kg, 190 ° C
Can be used, which is 0.5 to 50 g / 10 min.
Particularly, those having MI of 2 to 15 g / 10 minutes are preferable.
【００１５】エチレン−α−オレフィン共重合体ゴムと
しては、エチレンと、プロピレン、１−ブテン、１−ヘ
キセン、４−メチル−１−ペンテン、１−オクテン等の
α−オレフィンの１種又は２種以上との共重合体ゴム、
並びにエチレンと、上記のα−オレフィン（好ましくは
プロピレン）及び１，３−ブタジエン、イソプレン、
（ジ）シクロペンタジエン、１，４−ヘキサジエン、シ
クロオクタジエン、メチレンノルボルネン、エチリデン
ノルボルネン等のジオレフィンとの共重合体ゴムが挙げ
られる。これらの中でも、エチレンとプロピレン又は１
−ブテンとの共重合体ゴム、特にエチレンと１−ブテン
との共重合体ゴムが好ましい。The ethylene-α-olefin copolymer rubber includes ethylene and one or two kinds of α-olefins such as propylene, 1-butene, 1-hexene, 4-methyl-1-pentene and 1-octene. Copolymer rubber with,
And ethylene and the above-mentioned α-olefin (preferably propylene) and 1,3-butadiene, isoprene,
(Di) Copolymer rubbers with diolefins such as cyclopentadiene, 1,4-hexadiene, cyclooctadiene, methylene norbornene and ethylidene norbornene can be mentioned. Among these, ethylene and propylene or 1
A copolymer rubber with butene is preferable, and a copolymer rubber with ethylene and 1-butene is particularly preferable.
【００１６】上記共重合体ゴムは、密度が０．８６〜
０．９０ｇ／ｃｍ3 、特に０．８７０〜０．８９０ｇ／
ｃｍ3 のものが好ましく、又メルトインデックス（Ｍ
Ｉ；ＪＩＳ Ｋ７２１０；荷重２．１６ｋｇ、１９０℃
で測定）が０．５〜３０ｇ／１０分、特に１〜７ｇ／１
０分のものが好ましい。The copolymer rubber has a density of 0.86 to
0.90 g / cm 3 , especially 0.870 to 0.890 g /
cm 3 is preferable, and melt index (M
I; JIS K7210; load 2.16 kg, 190 ° C
0.5 to 30 g / 10 min, especially 1 to 7 g / 1
It is preferably 0 minutes.
【００１７】本発明のフィルムのシール層は、前記ポリ
プロピレン３０〜５０重量％、前記低密度ポリエチレン
２０〜３５重量％及び前記エチレン−α−オレフィン共
重合体ゴム２５〜４０重量％を配合したものからなる。The seal layer of the film of the present invention comprises 30 to 50% by weight of the polypropylene, 20 to 35% by weight of the low density polyethylene and 25 to 40% by weight of the ethylene-α-olefin copolymer rubber. Become.
【００１８】ポリプロピレンが３０重量％未満では、積
層フィルムとして充分な機械的強度が得られず、５０重
量％を超えると、良好なピール強度（剥離強度）が得ら
れない。When polypropylene is less than 30% by weight, sufficient mechanical strength as a laminated film cannot be obtained, and when it exceeds 50% by weight, good peel strength (peeling strength) cannot be obtained.
【００１９】低密度ポリエチレンが２０重量％未満で
は、一定のヒートシール強度が得られず、３５重量％を
超えると、積層フィルムとして機械的強度が低下し、実
用に適さなくなる。If the low-density polyethylene is less than 20% by weight, a certain heat-sealing strength cannot be obtained, and if it exceeds 35% by weight, the mechanical strength of the laminated film is lowered and it becomes unsuitable for practical use.
【００２０】エチレン−α−オレフィン共重合体ゴムが
２５重量％未満では、積層フィルムの透明性が低下し、
４０重量％を超えると、積層フィルムの耐熱性が低下す
る。When the ethylene-α-olefin copolymer rubber is less than 25% by weight, the transparency of the laminated film is lowered,
When it exceeds 40% by weight, the heat resistance of the laminated film decreases.
【００２１】上記配合において、特に低密度ポリエチレ
ンとエチレン−α−オレフィン共重合体ゴムとの配合割
合が重量比で１：１〜１：１．５となるようにするのが
好ましい。In the above blending, it is preferable that the blending ratio of the low density polyethylene and the ethylene-α-olefin copolymer rubber is 1: 1 to 1: 1.5 by weight.
【００２２】上記３成分の配合方法は、特に限定される
ものではないが、３成分を溶融下混練する方法が、３成
分が均一に混和されるので特に望ましい。The method of blending the three components is not particularly limited, but a method of kneading the three components in a molten state is particularly desirable because the three components are uniformly mixed.
【００２３】基材層となる前記ポリプロピレン及びシー
ル層となる前記３成分の配合物には、それぞれ必要に応
じて公知の添加剤、例えば酸化防止剤、紫外線吸収剤、
光安定剤、帯電防止剤、防曇剤、アンチブロッキング
剤、滑剤、顔料、染料等を添加することができる。The polypropylene of the base material layer and the mixture of the three components of the sealing layer may each contain, if necessary, known additives such as an antioxidant and an ultraviolet absorber.
A light stabilizer, an antistatic agent, an antifogging agent, an antiblocking agent, a lubricant, a pigment, a dye and the like can be added.
【００２４】本発明の積層フィルムの製造法は、特に限
定されず、既知のいかなる方法を採用してもよいが、共
に予め成形した基材層とシール層とを、押出しラミネー
トする共押出し法が、物性バランスに優れ、均一の膜厚
の積層フィルムが得られるので特に好ましい。The method for producing the laminated film of the present invention is not particularly limited, and any known method may be adopted, but a coextrusion method in which a preformed base material layer and a seal layer are extrusion laminated is used. It is particularly preferable because it has excellent physical property balance and a laminated film having a uniform film thickness can be obtained.
【００２５】共押出し法では、フラットダイを用いるＴ
−ダイ法又は環状ダイを用いるインフレーション法が適
用できる。Ｔ−ダイ法ではブラックボックスタイプの共
押出し方式又はマルチマニホールド方式のいずれでもよ
い。In the coextrusion method, T using a flat die is used.
-The inflation method using a die method or a circular die can be applied. The T-die method may be either a black box type co-extrusion method or a multi-manifold method.
【００２６】積層フィルムの厚さは、特に限定されない
が、通常は基材層が１０〜５０μｍ、シール層が１〜１
０μｍ、好ましくは２〜５μｍである。シール層の厚さ
が１μｍ未満では膜厚の調整が困難になると共にシール
層としての機能が発揮しにくくなり、１０μｍを超える
と糸引き、毛羽立ちの発生が激しくなることがある。Although the thickness of the laminated film is not particularly limited, it is usually 10 to 50 μm for the base material layer and 1 to 1 for the seal layer.
It is 0 μm, preferably 2 to 5 μm. When the thickness of the seal layer is less than 1 μm, it becomes difficult to adjust the film thickness and it is difficult to exert the function as the seal layer, and when it exceeds 10 μm, stringing and fuzzing may be severe.
【００２７】本発明の積層フィルムは、前記基材層と前
記シール層とからなるが、積層フィルムの使用目的によ
っては、更に基材層面上に、同一若しくは他のプラスチ
ック層及び金属層から選ばれる層を１層以上積層するこ
とができる。The laminated film of the present invention comprises the above-mentioned base material layer and the above-mentioned seal layer. Depending on the purpose of use of the laminated film, it is further selected from the same or another plastic layer and a metal layer on the surface of the base material layer. One or more layers can be laminated.
【００２８】本発明の積層フィルムを食品等の包装に用
いる場合、最内層のシール層同士をヒートシールする事
により、良好なシール状態を得る事ができ、これを剥が
す場合、広いシール温度（１１０℃〜１８０℃，特に１
２０℃〜１６０℃）で安定したピール強度（３００〜６
５０ｇｆ／１５ｍｍ）でシール部からの開封が容易に行
うことができる。ピール強度が３００ｇｆ／１５ｍｍ未
満では、内容物を充填シールした後、衝撃による内容物
の移動でシール部が開いてしまう事となり、６５０ｇｆ
／１５ｍｍを超えるとシール部からの開封が困難とな
る。When the laminated film of the present invention is used for packaging foods and the like, a good sealing state can be obtained by heat-sealing the innermost sealing layers, and when peeled off, a wide sealing temperature (110 ℃ -180 ℃, especially 1
Stable peel strength (300 ~ 6) at 20 ℃ ~ 160 ℃
With 50 gf / 15 mm), the opening from the seal portion can be easily performed. If the peel strength is less than 300 gf / 15 mm, after the content is filled and sealed, the content of the content may move due to impact and the seal part may open, resulting in 650 gf.
If it exceeds / 15 mm, it becomes difficult to open it from the seal portion.
【００２９】[0029]
【実施例】以下、本発明を実施例にて詳細に説明する。
なお、例におけるパーセント（％）は、ヘイズの場合を
除いて重量基準であり、積層フィルムの物性の測定は次
の試験法に従った。The present invention will be described below in detail with reference to examples.
The percentages (%) in the examples are on a weight basis except for the case of haze, and the physical properties of the laminated film were measured according to the following test methods.
【００３０】ヘイズ ＡＳＴＭ Ｄ１００３ヒートシール部剥離強度 基材層及びシール層からなる本発明の積層フィルム同士
をシール層を内層として、シール時間１．０秒、シール
面圧２．０ｋｇｆ／ｃｍ2 にて各シール温度でヒートシ
ールし、得られた積層物から１５ｍｍ幅の試験片を切り
取り、引張り速度３００ｍｍ／分でヒートシール部を剥
離した時の強度を示した。 Haze ASTM D1003 Peel strength at heat-sealed portion The laminated films of the present invention composed of a base material layer and a sealing layer, with the sealing layer as an inner layer, at a sealing time of 1.0 seconds and a sealing surface pressure of 2.0 kgf / cm 2 . Heat-sealing was performed at each sealing temperature, a test piece having a width of 15 mm was cut from the obtained laminate, and the strength when the heat-sealed portion was peeled off at a pulling rate of 300 mm / min was shown.
【００３１】（実施例１〜５）プロピレン−エチレンラ
ンダム共重合体（以下、ＲＣＰという。）（エチレン含
有量３．６％、ＭＦＲ ９．０ｇ／１０分）、低密度ポ
リエチレン（以下、ＬＤＰＥという。）（密度０．９２
２ｇ／ｃｍ3 、ＭＩ ６．３ｇ／１０分）及びエチレン
−１−ブテン共重合体ゴム（以下、ＥＢＲという。）
（１−ブテン含有量２０．０％、密度０．８８ｇ／ｃｍ
3 、ＭＩ ３．６ｇ／１０分）をそれぞれ表１に示す割
合でヘンシエルミキサーでドライブレンドした後、５０
ｍｍφの単軸押出機を用い２００℃で押出して、シール
層となる上記３成分の配合物のペレットとした。(Examples 1 to 5) Propylene-ethylene random copolymer (hereinafter referred to as RCP) (ethylene content 3.6%, MFR 9.0 g / 10 minutes), low density polyethylene (hereinafter referred to as LDPE). .) (Density 0.92
2 g / cm 3 , MI 6.3 g / 10 min) and ethylene-1-butene copolymer rubber (hereinafter referred to as EBR).
(1-butene content 20.0%, density 0.88 g / cm
3 and MI 3.6 g / 10 min) were dry-blended with a Hensiel mixer at the ratios shown in Table 1, respectively, and then 50
It was extruded at 200 ° C. using a mmφ single-screw extruder to obtain pellets of the above-mentioned three-component blend to form a seal layer.
【００３２】基材層となるホモポリプロピレン（ＭＦＲ
９．０ｇ／１０分）のペレット、シール層となる上記配
合物のペレット及び基材層の外層となるホモポリプロピ
レン（上記基材層となるものと同じもの）のペレット
を、Ｔ−ダイ法のブラックボックスタイプの共押出し装
置に供給し、２４０℃で共押出して３．７μｍの外層、
２２．６μｍの基材層、３．７μｍのシール層の３層構
造からなる積層フィルムに製膜した。Homopolypropylene (MFR) used as the base material layer
9.0 g / 10 min) pellets, pellets of the above-mentioned compound to be the seal layer and pellets of homopolypropylene (the same as the above-mentioned substrate layer) to be the outer layer of the substrate layer, were prepared by the T-die method. Supply to a black box type co-extrusion device, co-extruded at 240 ℃, 3.7μm outer layer,
The film was formed into a laminated film having a three-layer structure of a base layer of 22.6 μm and a seal layer of 3.7 μm.
【００３３】得られた積層フィルムを４０℃で２日間放
置した後、そのヘイズを測定すると共に、表２に示す温
度でシート層同士をヒートシールし、各温度におけるヒ
ートシール部の剥離強度を測定して、それらの結果を表
２に示した。The laminated film thus obtained was allowed to stand at 40 ° C. for 2 days, the haze thereof was measured, and the sheet layers were heat-sealed at the temperatures shown in Table 2 to measure the peel strength of the heat-sealed portion at each temperature. The results are shown in Table 2.
【００３４】（比較例１〜８）実施例１〜５で用いたＲ
ＣＰ，ＬＤＰＥ及びＥＢＲを表１に示す割合で用いる
か、ＬＤＰＥ及びＥＢＲの両方又はどちらか一方を用い
ない以外は、実施例１〜５と同様にして積層フィルムを
製造した。得られた積層フィルムを実施例１〜５と同様
にして処理した後、それらの物性を測定してそれらの結
果を表２に示した。(Comparative Examples 1 to 8) R used in Examples 1 to 5
Laminated films were produced in the same manner as in Examples 1 to 5 except that CP, LDPE and EBR were used in the proportions shown in Table 1, or both or one of LDPE and EBR was not used. After treating the obtained laminated films in the same manner as in Examples 1 to 5, the physical properties thereof were measured and the results are shown in Table 2.
【００３５】[0035]
【表１】 [Table 1]
【表２】 [Table 2]
【００３６】[0036]
【発明の効果】シール層を特定の組成にした本発明の積
層フィルムは、透明性が良好で、低温でのヒートシール
が可能であり、かつ１１０〜１８０℃という広いヒート
シール温度範囲において、３００〜６５０ｇｆ／１５ｍ
ｍという一定したヒートシール剥離強度を示す。The laminated film of the present invention in which the sealing layer has a specific composition has good transparency, can be heat-sealed at a low temperature, and has a wide heat-sealing temperature range of 110 to 180 ° C. ~ 650gf / 15m
It shows a constant heat seal peel strength of m.
【００３７】従って、ヒートシール温度を厳密に調整す
る必要がなく、ヒートシールの作業性が向上する。Therefore, it is not necessary to strictly adjust the heat-sealing temperature, and the workability of heat-sealing is improved.
Claims (2)
層との積層フィルムであり、該シール層はポリプロピレ
ン３０〜５０重量％、低密度ポリエチレン２０〜３５重
量％及びエチレン−α−オレフィン共重合体ゴム２５〜
４０重量％から形成されるものである包装用積層フィル
ム。1. A laminated film comprising a base material layer made of polypropylene and a seal layer, the seal layer comprising 30 to 50% by weight of polypropylene, 20 to 35% by weight of low density polyethylene and an ethylene-α-olefin copolymer rubber. 25-
A laminated film for packaging which is formed from 40% by weight.
レフィン共重合体ゴムとの配合割合が重量比で１：１〜
１：１．５であり、上記シール層を形成するポリプロピ
レンがプロピレン−エチレンランダム共重合体、エチレ
ン−α−オレフィン共重合体ゴムがエチレン−１−ブテ
ン共重合体ゴムである請求項１に記載の包装用積層フィ
ルム。2. The compounding ratio of the low density polyethylene and the ethylene-α-olefin copolymer rubber is 1: 1 by weight.
The ratio of 1: 1.5, the polypropylene forming the seal layer is a propylene-ethylene random copolymer, and the ethylene-α-olefin copolymer rubber is an ethylene-1-butene copolymer rubber. Laminated film for packaging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP916195A JPH08197694A (en) | 1995-01-24 | 1995-01-24 | Laminated film for package |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP916195A JPH08197694A (en) | 1995-01-24 | 1995-01-24 | Laminated film for package |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08197694A true JPH08197694A (en) | 1996-08-06 |
Family
ID=11712898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP916195A Pending JPH08197694A (en) | 1995-01-24 | 1995-01-24 | Laminated film for package |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08197694A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1158642A (en) * | 1997-08-21 | 1999-03-02 | Toray Gosei Film Kk | Easy-open composite film and easy-open paper container |
| JP2000272064A (en) * | 1999-03-26 | 2000-10-03 | Sumitomo Bakelite Co Ltd | Composite multilayered sheet |
| JP2000272065A (en) * | 1999-03-26 | 2000-10-03 | Sumitomo Bakelite Co Ltd | Composite multilayer sheet |
| JP2002179852A (en) * | 2000-12-18 | 2002-06-26 | Mitsui Chemicals Inc | Sealant material for polypropylene and readily openable hermetically sealed container |
| EP1591482A4 (en) * | 2003-01-31 | 2006-04-26 | Mitsui Du Pont Polychemical | RESIN COMPOSITION HAVING AN EASY-TO-OPEN PROPERTY AND USE THEREOF |
| JP2015061795A (en) * | 2015-01-08 | 2015-04-02 | 凸版印刷株式会社 | Paper container laminate and liquid paper container using the same |
| JP2017066305A (en) * | 2015-09-30 | 2017-04-06 | サンアロマー株式会社 | Sealant resin composition and laminate containing the same |
| JP2018131564A (en) * | 2017-02-16 | 2018-08-23 | 東ソー株式会社 | Adhesive for sealant and easily peelable film |
-
1995
- 1995-01-24 JP JP916195A patent/JPH08197694A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1158642A (en) * | 1997-08-21 | 1999-03-02 | Toray Gosei Film Kk | Easy-open composite film and easy-open paper container |
| JP2000272064A (en) * | 1999-03-26 | 2000-10-03 | Sumitomo Bakelite Co Ltd | Composite multilayered sheet |
| JP2000272065A (en) * | 1999-03-26 | 2000-10-03 | Sumitomo Bakelite Co Ltd | Composite multilayer sheet |
| JP2002179852A (en) * | 2000-12-18 | 2002-06-26 | Mitsui Chemicals Inc | Sealant material for polypropylene and readily openable hermetically sealed container |
| EP1216824A1 (en) * | 2000-12-18 | 2002-06-26 | Mitsui Chemicals, Inc. | Sealant for polypropylene and easily openable hermetically sealed package including the same |
| KR100456389B1 (en) * | 2000-12-18 | 2004-11-10 | 미쓰이 가가쿠 가부시키가이샤 | Sealant for polypropylene and easily openable hermetically sealed package including the same |
| US6933346B2 (en) | 2000-12-18 | 2005-08-23 | Mitsui Chemicals, Inc. | Sealant for polypropylene and easily openable hermetically sealed package including the same |
| EP1591482A4 (en) * | 2003-01-31 | 2006-04-26 | Mitsui Du Pont Polychemical | RESIN COMPOSITION HAVING AN EASY-TO-OPEN PROPERTY AND USE THEREOF |
| JPWO2004067626A1 (en) * | 2003-01-31 | 2006-05-18 | 三井・デュポンポリケミカル株式会社 | Easy-open resin composition and use thereof |
| KR100719403B1 (en) * | 2003-01-31 | 2007-05-17 | 듀폰-미츠이 폴리케미칼 가부시키가이샤 | Heat-sealable laminated film and package |
| US7651779B2 (en) | 2003-01-31 | 2010-01-26 | Du Pont-Mitsui Polychemicals Co., Ltd. | Resin composition having easy-openable property |
| JP5142470B2 (en) * | 2003-01-31 | 2013-02-13 | 三井・デュポンポリケミカル株式会社 | Easy-open resin composition and use thereof |
| JP2015061795A (en) * | 2015-01-08 | 2015-04-02 | 凸版印刷株式会社 | Paper container laminate and liquid paper container using the same |
| JP2017066305A (en) * | 2015-09-30 | 2017-04-06 | サンアロマー株式会社 | Sealant resin composition and laminate containing the same |
| JP2018131564A (en) * | 2017-02-16 | 2018-08-23 | 東ソー株式会社 | Adhesive for sealant and easily peelable film |
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