JP2002019035A - Polyethylene heat shrinkable film - Google Patents
Polyethylene heat shrinkable filmInfo
- Publication number
- JP2002019035A JP2002019035A JP2000210827A JP2000210827A JP2002019035A JP 2002019035 A JP2002019035 A JP 2002019035A JP 2000210827 A JP2000210827 A JP 2000210827A JP 2000210827 A JP2000210827 A JP 2000210827A JP 2002019035 A JP2002019035 A JP 2002019035A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- density
- heat
- low
- linear
- 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.)
- Granted
Links
- -1 Polyethylene Polymers 0.000 title claims abstract description 52
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 34
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 34
- 229920006257 Heat-shrinkable film Polymers 0.000 title claims abstract description 29
- 229920005989 resin Polymers 0.000 claims abstract description 73
- 239000011347 resin Substances 0.000 claims abstract description 73
- 239000011342 resin composition Substances 0.000 claims abstract description 31
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 20
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 20
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 5
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 5
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 20
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 20
- 239000002344 surface layer Substances 0.000 claims description 20
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 19
- 239000012792 core layer Substances 0.000 claims description 18
- 239000004708 Very-low-density polyethylene Substances 0.000 claims description 17
- 229920001866 very low density polyethylene Polymers 0.000 claims description 17
- 239000010410 layer Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 10
- 229920013716 polyethylene resin Polymers 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 abstract description 19
- 239000000443 aerosol Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 11
- 239000002994 raw material Substances 0.000 description 9
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 6
- 229920005679 linear ultra low density polyethylene Polymers 0.000 description 6
- 239000000155 melt Substances 0.000 description 6
- 239000004711 α-olefin Substances 0.000 description 6
- 230000003068 static effect Effects 0.000 description 5
- 238000010971 suitability test Methods 0.000 description 5
- 229920001862 ultra low molecular weight polyethylene Polymers 0.000 description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 4
- 239000005977 Ethylene Substances 0.000 description 4
- 230000037303 wrinkles Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229920006300 shrink film Polymers 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- XUFPYLQWLKKGDQ-UHFFFAOYSA-N 4,4a,9,9a-tetrahydro-1,4-methano-1h-fluorene Chemical class C12CC3=CC=CC=C3C1C1C=CC2C1 XUFPYLQWLKKGDQ-UHFFFAOYSA-N 0.000 description 1
- XWPLTJSUIZZGIB-UHFFFAOYSA-N C1C=CCC2CC3CC=CC=C3C=C12 Chemical class C1C=CCC2CC3CC=CC=C3C=C12 XWPLTJSUIZZGIB-UHFFFAOYSA-N 0.000 description 1
- JWRZBGBZMMABHQ-UHFFFAOYSA-N C=CC=CCCCCCC.C1=CC=CC1.C1=CC=CC1.C1=CC=CC1.C1=CC=CC1.C1=CC=CC1 Chemical class C=CC=CCCCCCC.C1=CC=CC1.C1=CC=CC1.C1=CC=CC1.C1=CC=CC1.C1=CC=CC1 JWRZBGBZMMABHQ-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- BTCUMMXRRUIJHU-UHFFFAOYSA-N acenaphthylene cyclopenta-1,3-diene Chemical group C1C=CC=C1.C1=CC(C=C2)=C3C2=CC=CC3=C1 BTCUMMXRRUIJHU-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001336 alkenes Chemical class 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
- LKXGYGYFPTZHLC-UHFFFAOYSA-N bicyclo[2.2.1]heptane-4-carboxylic acid Chemical compound C1CC2CCC1(C(=O)O)C2 LKXGYGYFPTZHLC-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 150000001925 cycloalkenes Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、食料品、日用雑貨
品等の商品の包装等に使用されるポリエチレン系熱収縮
性フィルムに関するものである。特に、包装仕上が良好
で、しかも、結束力と緊迫性に優れ熱収縮包装体が得ら
れるポリエチレン系熱収縮性フィルムに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-shrinkable polyethylene film used for wrapping goods such as foods and daily necessities. In particular, the present invention relates to a polyethylene-based heat-shrinkable film that has a good packaging finish and is excellent in binding power and tightness to obtain a heat-shrinkable package.
【０００２】[0002]
【従来の技術】従来、ポリエチレン系熱収縮性フィルム
に低温での熱収縮性を付与させ、包装仕上がりの良好な
熱収縮包装体を得るために、密度の低いポリエチレン系
樹脂を使用していた。特に、直鎖状極低密度ポリエチレ
ン樹脂が好適に使用されていた。しかし、密度の低いポ
リエチレン系樹脂を用いると、得られる熱収縮包装体の
結束力や緊迫性が劣り、集積包装等における結束が弱
く、しかも、フィルムが被包装物に密着していない部分
を指等で押すと容易に窪みが生じ、実用包装に於いて色
々トラブルが生じていた。2. Description of the Related Art Hitherto, a polyethylene resin having a low density has been used in order to impart heat shrinkage at a low temperature to a polyethylene-based heat-shrinkable film and obtain a heat-shrinkable package having a good packaging finish. In particular, a linear very low density polyethylene resin has been suitably used. However, when a polyethylene resin having a low density is used, the binding strength and tightness of the obtained heat-shrinkable package are inferior, the binding in the integrated packaging is weak, and the portion where the film is not in close contact with the article to be packaged is a finger. Pressing with such as causes a depression easily, causing various problems in practical packaging.
【０００３】そこで、熱収縮包装体の結束力と緊迫性を
向上させるために、密度の高いポリエチレン系樹脂を添
加させる方法が考えられる。しかし、該方法では、結束
力や緊迫性を向上させることはできるが、低温での延伸
性が阻害されて低温熱収縮性が低下し、包装仕上がりの
良好な熱収縮包装体を得ることができなかった。尚、直
鎖状低密度ポリエチレン樹脂からなる熱収縮性フィルム
の包装機械適性を向上させる方法として、環状オレフィ
ン系樹脂を添加させる方法は知られている。例えば、特
開平８−２６７６７９号に紹介されている。しかし、該
公報に記載されたポリエチレン系熱収縮性共押出フィル
ムは、引張弾性率が高く、耐衝撃性や高速での包装機械
適性には優れているが、低温での熱収縮性に劣り、良好
なる熱収縮包装体を得ることが困難であった。In order to improve the binding force and tightness of the heat-shrinkable package, a method of adding a high-density polyethylene resin has been considered. However, in this method, although the binding strength and the tightness can be improved, the stretchability at a low temperature is impaired, the low-temperature heat shrinkage is reduced, and a heat-shrinkable package having a good packaging finish can be obtained. Did not. As a method for improving the suitability of a heat-shrinkable film made of a linear low-density polyethylene resin for a packaging machine, a method of adding a cyclic olefin-based resin is known. For example, it is introduced in JP-A-8-267679. However, the polyethylene-based heat-shrinkable co-extruded film described in this publication has a high tensile modulus and is excellent in impact resistance and suitability for high-speed packaging machines, but is inferior in heat shrinkability at low temperatures, It was difficult to obtain a good heat-shrinkable package.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、包装仕上が
りが良好で、しかも、結束力と緊迫性に優れた熱収縮包
装体が得られるポリエチレン系熱収縮性フィルムを提供
しようとするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a polyethylene-based heat-shrinkable film from which a heat-shrinkable package having a good packaging finish and excellent binding power and tightness can be obtained. .
【０００５】[0005]
【課題を解決するための手段】本発明は、上記課題を解
決するために、次のような手段を講じた。即ち、少なく
とも１層が密度０．８６０〜０．９１０ｇ／ｃｍ３の直
鎖状極低密度ポリエチレン樹脂を含有する樹脂組成物か
らなり、少なくとも１層が環状オレフィン系樹脂を含有
するようにする。好ましくは、芯層が、密度０．８６０
〜０．９１０ｇ／ｃｍ３の直鎖状極低密度ポリエチレン
樹脂を含有する樹脂組成物と環状オレフィン系樹脂から
なり、表面層が、密度０．９１０ｇ／ｃｍ３を越える直
鎖状低密度ポリエチレン樹脂を含有する樹脂組成物から
なるようにする。又、芯層が、密度０．８６０〜０．９
１０ｇ／ｃｍ３の直鎖状極低密度ポリエチレン樹脂を含
有する樹脂組成物からなり、表面層が、密度０．９１０
ｇ／ｃｍ ３を越える直鎖状低密度ポリエチレン樹脂を含
有する樹脂組成物と環状オレフィン系樹脂からなるよう
にする。又、芯層が、密度０．９１０ｇ／ｃｍ３を越え
る直鎖状低密度ポリエチレン樹脂を含有する樹脂組成物
からなり、表面層が、密度０．８６０〜０．９１０ｇ／
ｃｍ３の直鎖状極低密度ポリエチレン樹脂を含有する樹
脂組成物と環状オレフィン系樹脂からなるようにする。
又、芯層が、密度０．９１０ｇ／ｃｍ３を越える直鎖状
低密度ポリエチレン樹脂を含有する樹脂組成物と環状オ
レフィン系樹脂からなり、表面層が、密度０．８６０〜
０．９１０ｇ／ｃｍ３の直鎖状極低密度ポリエチレン樹
脂を含有する樹脂組成物からなるようにする。更に好ま
しくは、フィルム全体に含まれる直鎖状極低密度ポリエ
チレン樹脂の含有量が５〜５０ｗｔ％で、しかも、環状
オレフィン系樹脂を含有する層のの環状オレフィン系樹
脂の含有量を２ｗｔ％以上で、１０ｗｔ％未満にする。The present invention solves the above problems.
In order to decide, the following measures were taken. That is, less
Both layers have a density of 0.860 to 0.910 g / cm3Directly
Is it a resin composition containing a chain ultra-low density polyethylene resin?
And at least one layer contains a cyclic olefin resin
To do it. Preferably, the core layer has a density of 0.860
~ 0.910 g / cm3Linear ultra low density polyethylene
From resin composition containing resin and cyclic olefin resin
And the surface layer has a density of 0.910 g / cm3Straight over
From resin compositions containing linear low-density polyethylene resin
To be. The core layer has a density of 0.860 to 0.9.
10g / cm3Containing linear very low density polyethylene resin
And a surface layer having a density of 0.910
g / cm 3Containing linear low-density polyethylene resin
Having a resin composition having a cyclic olefin resin
To The core layer has a density of 0.910 g / cm.3Beyond
Resin composition containing linear low-density polyethylene resin
And the surface layer has a density of 0.860 to 0.910 g /
cm3Containing low linear density polyethylene resin
It is made of a fat composition and a cyclic olefin resin.
The core layer has a density of 0.910 g / cm.3Linear over
A resin composition containing a low-density polyethylene resin and
The surface layer is made of a refin-based resin and has a density of 0.860-
0.910 g / cm3Linear ultra low density polyethylene tree
It is made of a resin composition containing fat. More preferred
Or the linear very low density polyether contained in the entire film.
5 to 50 wt% of content of Tylene resin
Cyclic olefin-based tree of layer containing olefin-based resin
The fat content is set to 2 wt% or more and less than 10 wt%.
【０００６】[0006]
【発明の実施態様】本発明のポリエチレン系熱収縮性フ
ィルムにおいて、直鎖状極低密度ポリエチレン樹脂を含
有する樹脂組成物とは、密度が０．８６０〜０．９１０
ｇ／ｃｍ３、好ましくは、０．８７０〜０．９００ｇ／
ｃｍ３のエチレン−αオレフィン共重合体を含有する樹
脂組成物で、特定された密度範囲外のエチレン−αオレ
フィン共重合体や、高圧法低密度ポリエチレン樹脂等を
添加させた樹脂組成物をも意味する。勿論、密度が０．
８６０〜０．９１０ｇ／ｃｍ３、好ましくは、０．８７
０〜０．９００ｇ／ｃｍ３のエチレン−αオレフィン共
重合体のみからなる樹脂を意味することは当然である。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the polyethylene heat-shrinkable film of the present invention, the resin composition containing a linear very low density polyethylene resin has a density of 0.860 to 0.910.
g / cm 3 , preferably 0.870 to 0.900 g /
cm 3 of an ethylene-α-olefin copolymer, a resin composition containing an ethylene-α-olefin copolymer outside the specified density range, or a high-pressure low-density polyethylene resin or the like. means. Of course, the density is 0.
860 to 0.910 g / cm 3 , preferably 0.87
Naturally, it means a resin composed of only an ethylene-α-olefin copolymer of 0 to 0.900 g / cm 3 .
【０００７】直鎖状極低密度ポリエチレン樹脂の密度が
０．８６０ｇ／ｃｍ３未満であると、延伸加工を施して
も良好なる熱収縮性が得られなくなる。又、密度が、
０．９１０ｇ／ｃｍ３を越えると、低温での延伸加工性
が劣り、低温熱収縮性が低下して良好なる熱収縮包装体
が得られなくなる。[0007] If the linear ultra low density polyethylene resin has a density of less than 0.860 g / cm 3 , good heat shrinkage cannot be obtained even after stretching. Also, the density is
If it exceeds 0.910 g / cm 3 , the stretchability at low temperatures is inferior, and the low-temperature heat shrinkability is reduced, so that a favorable heat-shrinkable package cannot be obtained.
【０００８】又、直鎖状低密度ポリエチレン樹脂を含有
する樹脂組成物とは、密度が０．９１０ｇ／ｃｍ３を越
えるエチレン−αオレフィン共重合体を含有する樹脂組
成物で、特定された密度範囲外のエチレン−αオレフィ
ン共重合体や、高圧法低密度ポリエチレン樹脂、低圧法
高密度ポリエチレン樹脂等を添加させた樹脂組成物をも
意味する。勿論、密度が０．９１０ｇ／ｃｍ３を越える
エチレン−αオレフィン共重合体のみからなる樹脂を意
味することは当然である。[0008] A resin composition containing a linear low-density polyethylene resin is a resin composition containing an ethylene-α-olefin copolymer having a density exceeding 0.910 g / cm 3 and having a specified density. It also means a resin composition to which an ethylene-α-olefin copolymer outside the range, a high-pressure low-density polyethylene resin, a low-pressure high-density polyethylene resin, or the like is added. Of course, it naturally means a resin consisting of only an ethylene-α-olefin copolymer having a density exceeding 0.910 g / cm 3 .
【０００９】更に、本発明に用いられる環状オレフィン
系樹脂とは、エチレンと環状オレフィンとからなるエチ
レン−環状オレフィンランダム共重合体である。そし
て、ガラス転移温度が５０℃以上、好ましくは、７０℃
以上のものである。具体的には、エチレンから誘導され
る構成単位を５０〜９０モル％、好ましくは、５５〜８
０モル％の量で、環状オレフィンから誘導される構成単
位を１０〜５０モル％、好ましくは、２０〜４５モル％
含有している公知のものが使用される。Further, the cyclic olefin resin used in the present invention is an ethylene-cyclic olefin random copolymer comprising ethylene and a cyclic olefin. And the glass transition temperature is 50 ° C. or more, preferably 70 ° C.
That's all. Specifically, 50 to 90 mol%, preferably 55 to 8 mol% of the structural unit derived from ethylene is used.
In an amount of 0 mol%, 10 to 50 mol%, preferably 20 to 45 mol%, of a structural unit derived from a cyclic olefin is used.
Known ones are used.
【００１０】エチレンと共重合させる環状オレフィンと
しては、例えば、ビシクロ［2.2.1］ヘプトン-2-エン誘
導体、テトラシクロ［4.4.0.12.5.17.10］-3-ドデセン
誘導体、ヘキサシクロ［6.6.1.13.5.110.13.02.7.
09.14］-4-ヘプタデセン誘導体、オクタシクロ［8.8.0.
12.9.14.7.111.18.113.16.03.8.012.17］-5-ドコセン誘
導体、ペンタシクロ［6.6.1.13.6.02.7.09.14］-4-ヘキ
サデセン誘導体、ヘプタシクロ-5-エイコセン誘導体、
ヘプタシクロ-5-ヘンエイコセン誘導体、トリシクロ
［4.3.0.12.5］-3-デセン誘導体、トリシクロ［4.3.0.1
2.5］-3-ウンデセン誘導体、ペンタシクロ［6.5.1.
13.5.02.7.09.13］-4-ペンタデセン誘導体、ペンタシク
ロペンタデカジエン誘導体、ペンタシクロ［7.4.0.
12.5.19.12.08.13］-3-ペンタデセン誘導体、ペンタシ
クロ［8.7.0.1.3.6.110.17.112.15.02.7.011.15］-4-エ
イコセン誘導体、ノナシクロ［10.9.1.14.7.113.20.1
15.18.03.8.02.10.012 .21.014.19］-5-ペンタコセン誘
導体、ペンタシクロ［8.4.0.12.3.19.12.08.13］-3-ヘ
キサデセン誘導体、ペンタシクロ［8.8.0.14.7.111.18.
113.15.03.8.012 .17］-5-ヘンエイコセン誘導体、ノナ
シクロ［10.10.1.15.8.114.21.115.19.02. 11.04.9.0
13.22.015.20］-5-ヘキサコセン誘導体、1,4-メタノ-1,
4,4a,9a-テトラヒドロフルオレン誘導体、1,4-メタノ-
1,4,4a,5,10,10a-ヘキサヒドロアントラセン誘導体、シ
クロペンタジエン-アセナフチレン付加物等を例示する
ことができる。[0010] As the cyclic olefin to be copolymerized with ethylene, e.g., bicyclo [2.2.1] heptanoate 2-ene derivatives, tetracyclo [4.4.0.1 2.5 .1 7.10] -3- dodecene derivatives, hexacyclo [6.6.1.1 3.5 .1 10.13 .0 2.7 .
0 9.14 ] -4-heptadecene derivative, octacyclo [8.8.0.
1 2.9 .1 4.7 .1 11.18 .1 13.16 .0 3.8 .0 12.17] -5-docosene derivatives, pentacyclo [6.6.1.1 3.6 .0 2.7 .0 9.14] -4- hexadecene derivative, heptacyclo-5-eicosene derivatives,
Heptacyclo-5-heneicosene derivative, tricyclo [4.3.0.1 2.5 ] -3-decene derivative, tricyclo [4.3.0.1
2.5 ] -3-undecene derivative, pentacyclo [6.5.1.
1 3.5 .0 2.7 .0 9.13] -4-pentadecene derivatives, penta cyclopentadiene decadiene derivative, pentacyclo [7.4.0.
1 2.5 .1 9.12 .0 8.13] -3-pentadecene derivatives, pentacyclo [8.7.0.1.3.6.1 10.17 .1 12.15 .0 2.7 .0 11.15] -4-eicosene derivatives, Nonashikuro [10.9.1.1 4.7 .1 13.20 .1
15.18 .0 3.8 .0 2.10 .0 12.21 .0 14.19] -5-pentacosene derivatives, pentacyclo [8.4.0.1 2.3 .1 9.12 .0 8.13] -3- hexadecene derivative, pentacyclo [8.8.0.1 4.7 .1 11.18 .
1 13.15 .0 3.8 .0 12.17] -5-heneicosene derivatives, Nonashikuro [10.10.1.1 5.8 .1 14.21 .1 15.19 .0 2. 11 .0 4.9 .0
13.22 .0 15.20 ] -5-hexacocene derivative, 1,4-methano-1,
4,4a, 9a-tetrahydrofluorene derivative, 1,4-methano-
Examples thereof include 1,4,4a, 5,10,10a-hexahydroanthracene derivatives, cyclopentadiene-acenaphthylene adducts, and the like.
【００１１】そして、本発明のポリエチレン系熱収縮性
フィルムは、少なくとも１層が密度０．８６０〜０．９
１０ｇ／ｃｍ３、好ましくは、０．８７０〜０．９００
ｇ／ｃｍ３の直鎖状極低密度ポリエチレン樹脂を含有す
る樹脂組成物からなり、少なくとも１層に環状オレフィ
ン系樹脂を含有させるようにする。即ち、本発明のポリ
エチレン系熱収縮性フィルムは、直鎖状極低密度ポリエ
チレン樹脂を含有する樹脂組成物に環状オレフィン系樹
脂を含有させた単層フィルムは勿論、直鎖状極低密度ポ
リエチレン樹脂を含有する樹脂組成物や環状オレフィン
系樹脂を含有する層からなる多層フィルムを挙げること
ができる。特に、多層構成にすることにより本発明の特
徴をより発揮させることができる。The polyethylene heat-shrinkable film of the present invention has at least one layer having a density of 0.860 to 0.9.
10 g / cm 3 , preferably 0.870 to 0.900
It is made of a resin composition containing g / cm 3 of a linear very low density polyethylene resin, and at least one layer contains a cyclic olefin-based resin. That is, the polyethylene-based heat-shrinkable film of the present invention is not only a single-layer film containing a cyclic olefin-based resin in a resin composition containing a linear very-low-density polyethylene resin, but also a linear ultra-low-density polyethylene resin. And a multilayer film comprising a layer containing a cyclic olefin-based resin. In particular, the features of the present invention can be further exhibited by adopting a multilayer structure.
【００１２】例えば、芯層に直鎖状極低密度ポリエチレ
ン樹脂を含有する樹脂組成物と環状オレフィン系樹脂を
用い、表面層に直鎖状低密度ポリエチレン樹脂を含有す
る樹脂組成物を用いる多層構成、或いは、芯層に直鎖状
極低密度ポリエチレン樹脂を含有する樹脂組成を用い、
表面層に直鎖状低密度ポリエチレン樹脂を含有する樹脂
組成物と環状オレフィン系樹脂を用いる多層構成や、芯
層に直鎖状低密度ポリエチレン樹脂を含有する樹脂組成
物を用い、表面層に直鎖状極低密度ポリエチレン樹脂を
含有する樹脂組成物と環状オレフィン系樹脂を用いる多
層構成等は、滑り性が良好で包装機械適性が良好であ
る。又、芯層に直鎖状低密度ポリエチレン樹脂を含有す
る樹脂組成物と環状オレフィン系樹脂を用い、表面層に
直鎖状極低密度ポリエチレン樹脂を用いる場合には、ブ
ロッキング性が生じ易く、ストレッチシュリンクフィル
ム等に好適である。For example, a multilayer structure using a resin composition containing a linear very low density polyethylene resin in a core layer and a cyclic olefin resin and a resin composition containing a linear low density polyethylene resin in a surface layer. Or, using a resin composition containing a linear very low density polyethylene resin in the core layer,
A multilayer structure using a resin composition containing a linear low-density polyethylene resin and a cyclic olefin resin in the surface layer, or a resin composition containing a linear low-density polyethylene resin in the core layer, A multilayer composition using a resin composition containing a chain ultra-low density polyethylene resin and a cyclic olefin-based resin has good slipperiness and good packaging machine suitability. Further, when a resin composition containing a linear low-density polyethylene resin and a cyclic olefin-based resin are used for the core layer, and a linear ultra-low-density polyethylene resin is used for the surface layer, blocking properties easily occur, and It is suitable for shrink films and the like.
【００１３】単層構成のフィルムの場合には、直鎖状極
低密度ポリエチレン樹脂に直鎖状低密度ポリエチレン樹
脂等を混合させた混合物に環状オレフィン系樹脂を含有
させたものが、滑り性が良好で包装機械適性が良好であ
る。又、直鎖状極低密度ポリエチレン樹脂に環状オレフ
ィン系樹脂を含有させた単層フィルムは、ブロッキング
性が生じ易く、ストレッチシュリンクフィルム等に好適
である。In the case of a single-layer film, a mixture of a linear ultra-low density polyethylene resin and a linear low-density polyethylene resin or the like containing a cyclic olefin resin has a slipperiness. Good and suitable for packaging machines. In addition, a single-layer film in which a cyclic olefin-based resin is added to a linear very low-density polyethylene resin easily causes blocking properties, and is suitable for a stretch shrink film or the like.
【００１４】又、フィルム全体に含まれる直鎖状極低密
度ポリエチレン樹脂の含有量は５〜５０ｗｔ％で、しか
も、環状オレフィン系樹脂を含有する層の環状オレフィ
ン系樹脂の含有量は２ｗｔ％以上で、１０ｗｔ％未満で
あることが好ましい。直鎖状極低密度ポリエチレン樹脂
含有量が、５ｗｔ％未満であると、低温での延伸加工が
困難になり、低温熱収縮性が劣って良好なる熱縮包装体
を得ることが困難にる場合がある。又、５０ｗｔ％を越
えると、低温での延伸加工は可能であるが、延伸安定性
に劣り、長時間連続して延伸加工することが困難になる
場合がある。Further, the content of the linear very low density polyethylene resin contained in the whole film is 5 to 50 wt%, and the content of the cyclic olefin resin in the layer containing the cyclic olefin resin is 2 wt% or more. And less than 10 wt%. When the content of the linear very low density polyethylene resin is less than 5 wt%, it is difficult to perform stretching at low temperature, and it is difficult to obtain a good heat-shrinkable package having poor low-temperature heat shrinkability. There is. On the other hand, if it exceeds 50% by weight, stretching at a low temperature is possible, but stretching stability is poor, and it may be difficult to stretch continuously for a long time.
【００１５】更に、環状オレフィン系樹脂を含有する層
の環状オレフィン系樹脂含有量が、２ｗｔ％未満である
と、結束力や緊迫性、更には、低温熱収縮性を向上させ
ることが困難である。又、１０ｗｔ％を越えると透明性
が低下するので好ましくない。尚、本発明のポリエチレ
ン系熱収縮性フィルムは、環状オレフィン系樹脂の含有
量をフィルム全体に対して２ｗｔ％以上、１０ｗｔ％未
満含有させる。環状オレフィン系樹脂含有量が、２ｗｔ
％未満であると、得られる熱収縮包装体の結束力や緊迫
性が劣るようになるばかりか、低温での延伸加工性が改
良されないために低温熱収縮性が向上せず、良好なる熱
収縮包装体が得られ難くなる場合がある。又、１０ｗｔ
％以上になると引き裂き強度が低下するようになるので
好ましくない。When the content of the cyclic olefin-based resin in the layer containing the cyclic olefin-based resin is less than 2 wt%, it is difficult to improve the binding power, tightness, and low-temperature heat shrinkability. . On the other hand, if it exceeds 10% by weight, the transparency is undesirably reduced. In the polyethylene-based heat-shrinkable film of the present invention, the content of the cyclic olefin-based resin is at least 2 wt% and less than 10 wt% based on the whole film. Cyclic olefin resin content is 2wt
%, The binding strength and tightness of the obtained heat-shrinkable package become poor, and the low-temperature heat-shrinkability does not improve because the stretchability at low temperatures is not improved, resulting in good heat shrinkage. It may be difficult to obtain a package. Also, 10wt
% Or more is not preferred because the tear strength decreases.
【００１６】本発明のポリエチレン系熱収縮性フィルム
は、熱収縮包装に用いられることから、フィルム厚みと
しては、１０〜５０μｍの範囲内のものが一般的であ
る。又、本発明のポリエチレン系熱収縮性フィルムに
は、酸化防止剤や帯電防止剤、或いは、滑剤やアンチブ
ロッキング剤等の添加剤を適宜加えることができるのは
当然である。Since the heat-shrinkable polyethylene film of the present invention is used for heat-shrinkable packaging, the film thickness is generally in the range of 10 to 50 μm. Further, it is natural that additives such as an antioxidant and an antistatic agent, or a lubricant and an antiblocking agent can be appropriately added to the polyethylene-based heat-shrinkable film of the present invention.
【００１７】本発明のポリエチレン系熱収縮性フィルム
の製造方法は、特に限定されるものではないが、次のよ
うな方法によって製造することができる。例えば、３層
構成のポリエチレン系熱収縮性フィルムの場合では、３
台の押出機と３種３層用のサーキュラーダイにより、所
定の樹脂構成を有する３層構成のチューブ状未延伸原反
を製膜する。そして、該原反を再加熱し、インフレーシ
ョン方式によって２軸延伸処理を行い、必要に応じ、熱
処理により自然収縮性を除去させて、ポリエチレン系熱
収縮性フィルムを得る。The method for producing the heat-shrinkable polyethylene film of the present invention is not particularly limited, but it can be produced by the following method. For example, in the case of a three-layer polyethylene heat-shrinkable film,
A three-layer tubular unstretched raw material having a predetermined resin composition is formed by a single extruder and a circular die for three types and three layers. Then, the raw material is reheated, biaxial stretching is performed by an inflation method, and if necessary, natural shrinkage is removed by heat treatment to obtain a polyethylene-based heat-shrinkable film.
【００１８】[0018]
【作用】本発明のポリエチレン系熱収縮性フィルムは、
直鎖状極低密度を含有しているので、低温での熱収縮性
に優れ、しかも、環状オレフィン系樹脂を含有している
ので、低温での延伸加工性が良好になり、低温での熱収
縮性がより向上している。そのため、本発明のポリエチ
レン系熱収縮性フィルムは、熱収縮時に商品に接触して
も十分に熱収縮が生じるので、皺等が生じ難く、包装仕
上がりの良好なる熱収縮包装体を得ることができる。
又、本発明のポリエチレン系熱収縮性フィルムは、環状
オレフィン系樹脂を含有しているので、得られる熱収縮
包装体の結束力や緊迫性が向上し、取扱時に集積包装さ
れた商品が荷崩れを生じるようなことがなく、しかも、
取扱時にフィルムが被包装物に密着していない部分が指
等で押されても窪みを生じるようなことがない。The polyethylene heat-shrinkable film of the present invention
Because it contains a linear ultra-low density, it has excellent heat shrinkability at low temperatures, and because it contains a cyclic olefin-based resin, it has good stretch processability at low temperatures and heat at low temperatures. Shrinkage is more improved. Therefore, since the polyethylene heat-shrinkable film of the present invention sufficiently shrinks even when it comes into contact with the product at the time of heat shrinkage, wrinkles and the like hardly occur, and a heat-shrinkable package having a good packaging finish can be obtained. .
Moreover, since the polyethylene-based heat-shrinkable film of the present invention contains a cyclic olefin-based resin, the binding strength and tightness of the obtained heat-shrinkable package are improved, and the products packed and packed during handling collapse. Does not occur, and
Even when a portion where the film is not in close contact with the packaged object is pressed by a finger or the like during handling, no depression is formed.
【００１９】[0019]
【実施例】以下、実施例、及び、比較例を示し、本発明
の内容をより具体的に説明する。尚、本発明は、実施例
に記載された事項によってのみ限定されるものでないこ
とは、当然である。本発明において、各フィルム物性は
次のような方法によって測定した。 ［熱収縮性］ＡＳＴＭ Ｄ８８２に準拠してフィルムの
縦方向と横方向について測定した。 ［滑り性］ＡＳＴＭ １８９４に準拠して静摩擦係数と
動摩擦係数を測定した。 ［透明性］ＡＳＴＭ １００３に準拠してヘイズ値を測
定した。 ［熱収縮包装適性］直径６０ｍｍ、高さ１９０ｍｍのエ
アゾール缶２本を、折り幅２３０ｍｍの半折フィルムを
用い、半折自動包装機（ハナガタ機械（株）製 形式：
ＨＰ−１０型）により、熱収縮包装を行った。その際、
熱収縮包装仕上がりの状態を目視により観察した。 ［結束力と緊迫性］熱収縮包装適性試験で得られた熱収
縮包装体のエアゾール缶２本を両手で動かし、容易に動
くかどうかで、結束力を調べた。又、フィルムがエアゾ
ール缶に接触していない部分（エアゾール缶の上部に位
置する噴射口部と上端肩部との間）を指で押し、容易に
窪みが生じるかどうかで、緊迫性を調べた。EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples. It should be noted that the present invention is not limited only to the matters described in the embodiments. In the present invention, the physical properties of each film were measured by the following methods. [Heat shrinkability] Measured in the longitudinal and transverse directions of the film according to ASTM D882. [Slidability] The static friction coefficient and the dynamic friction coefficient were measured in accordance with ASTM 1894. [Transparency] The haze value was measured according to ASTM 1003. [Suitability for heat shrink wrapping] A half-fold automatic packaging machine (manufactured by Hanagata Machine Co., Ltd.) using two aerosol cans having a diameter of 60 mm and a height of 190 mm using a half-fold film having a folding width of 230 mm.
(HP-10 type). that time,
The finished state of the heat shrink wrapping was visually observed. [Bundling force and tightness] Two aerosol cans of the heat-shrinkable package obtained in the heat-shrinkable packaging suitability test were moved with both hands, and the bundling force was examined by whether or not it easily moved. In addition, the part where the film was not in contact with the aerosol can (between the injection port located at the upper part of the aerosol can and the upper end shoulder) was pressed with a finger, and the tightness was examined to determine whether or not a depression easily occurred. .
【００２０】〔実施例１〕芯層に、密度０．８８０ｇ／
ｃｍ３、メルトインデックス１．０ｇ／１０ｍｉｎの直
鎖状極低密度ポリエチレン樹脂３０ｗｔ％、密度０．９
２０ｇ／ｃｍ３、メルトインデックス１．０ｇ／１０ｍ
ｉｎの直鎖状低密度ポリエチレン樹脂６２ｗｔ％に、環
状オレフィン系樹脂（三井石油化学株式会社製 商品
名：ＡＰＬ８００８Ｔ）を８ｗｔ％含有させた混合物を
用い、両表面層に、密度０．９２０ｇ／ｃｍ３、メルト
インデックス１．０ｇ／１０ｍｉｎの直鎖状低密度ポリ
エチレン樹脂を用い、３台の押出機と３種３層のサーキ
ュラーダイによりチューブ状多層未延伸原反を製膜し
た。尚、未延伸原反の厚み構成は、表面層／芯層／表面
層が１／２／１であり、未延伸原反中の直鎖状極低密度
ポリエチレン樹脂の含有量は１５％であった。得られた
未延伸原反を再加熱し、インフレーション方式により縦
方向、横方向共に５倍に延伸して、厚み２０μｍのポリ
エチレン系熱収縮フィルムを得た。尚、延伸温度は、１
０５℃であった。Example 1 The core layer had a density of 0.880 g /
cm 3 , 30 wt% of a linear very low density polyethylene resin having a melt index of 1.0 g / 10 min, and a density of 0.9.
20 g / cm 3 , melt index 1.0 g / 10 m
A mixture of 62 wt% of a linear low-density polyethylene resin and 8 wt% of a cyclic olefin resin (trade name: APL8008T, manufactured by Mitsui Petrochemical Co., Ltd.) was used. 3. Using a linear low-density polyethylene resin having a melt index of 1.0 g / 10 min, a tubular multilayer unstretched film was formed with three extruders and three types of three-layer circular dies. The thickness composition of the unstretched raw material was 1/2/1 for the surface layer / core layer / surface layer, and the content of the linear ultra-low density polyethylene resin in the unstretched raw material was 15%. Was. The obtained unstretched raw material was reheated and stretched 5 times in both the longitudinal and transverse directions by an inflation method to obtain a polyethylene-based heat-shrinkable film having a thickness of 20 μm. The stretching temperature is 1
05 ° C.
【００２１】得られたポリエチレン系熱収縮フィルムの
熱収縮性は、縦方向、横方向それぞれ、１１０℃で５７
％、５８％であり、低温での熱収縮性に優れていた。
又、フィルムの滑り性は、静摩擦係数が０．２５、動摩
擦係数が０．２３、透明性はヘイズ値が３．０％で、共
に良好であった。更に、熱収縮包装適性試験の結果、フ
ィルムがエアゾール缶に接している部分に皺が生じるよ
うなこともなく、良好なる包装仕上がりであった。又、
得られた熱収縮包装体は、２本のエアゾール缶を両手で
容易に動かすことができず、結束力に優れていた。更
に、フィルムがエアゾール缶に接していない部分を強く
指で押さないと窪みが生ぜず、緊迫性に優れていた。The heat shrinkability of the obtained polyethylene-based heat shrink film was 57 ° C. at 110 ° C. in each of the longitudinal and transverse directions.
% And 58%, which were excellent in heat shrinkability at low temperatures.
The slip property of the film was 0.25, the coefficient of static friction was 0.23, the coefficient of dynamic friction was 0.23, and the haze value of the transparency was 3.0%. Furthermore, as a result of the heat shrink wrapping suitability test, the wrapping was excellent with no wrinkles occurring at the portion where the film was in contact with the aerosol can. or,
The obtained heat-shrinkable package did not easily move the two aerosol cans with both hands, and had excellent binding power. Furthermore, if the part where the film was not in contact with the aerosol can was pressed strongly with a finger, no dent was formed and the tightness was excellent.
【００２２】〔実施例２〕芯層に、密度０．９０２ｇ／
ｃｍ３、メルトインデックス１．０ｇ／１０ｍｉｎの直
鎖状極低密度ポリエチレン樹脂６０ｗｔ％と、密度０．
９２０ｇ／ｃｍ ３、メルトインデックス１．０ｇ／１０
ｍｉｎの直鎖状低密度ポリエチレン樹脂４０ｗｔ％の混
合物を用い、両表面層に、密度０．９２０ｇ／ｃｍ３、
メルトインデックス１．０ｇ／１０ｍｉｎの直鎖状低密
度ポリエチレン樹脂９２ｗｔ％に環状オレフィン系樹脂
（三井石油化学株式会社製 商品名：ＡＰＬ８００８
Ｔ）を８ｗｔ％含有させた混合物を用い、実施例例１と
同様、チューブ状多層未延伸原反を製膜した。尚、未延
伸原反の厚み構成は、表面層／芯層／表面層が１／３／
１であり、未延伸原反中の直鎖状極低密度ポリエチレン
樹脂の含有量は３６％であった。得られた未延伸原反を
再加熱し、実施例１と同様、インフレーション方式によ
り縦方向、横方向共に５倍延伸して、厚み２０μｍのポ
リエチレン系熱収縮フィルムを得た。尚、延伸温度は、
１０２℃であった。Example 2 The core layer had a density of 0.902 g /
cm3With a melt index of 1.0 g / 10 min
A chain ultra-low density polyethylene resin of 60 wt% and a density of 0.
920 g / cm 3, Melt index 1.0 g / 10
min linear low density polyethylene resin 40wt%
Using the compound, a density of 0.920 g / cm was applied to both surface layers.3,
Linear low density with melt index 1.0g / 10min
92% by weight of polyethylene resin to cyclic olefin resin
(Mitsui Petrochemical Co., Ltd. Product name: APL8008
Using a mixture containing 8 wt% of T),
Similarly, a tubular multilayer unstretched raw film was formed. Not yet
The thickness composition of the raw sheet is 1/3 / surface layer / core layer / surface layer.
1, linear ultra low density polyethylene in unstretched raw material
The resin content was 36%. The obtained unstretched raw material
Reheat and apply inflation method as in Example 1.
Stretched 5 times in both the vertical and horizontal directions,
A ethylene-based heat-shrinkable film was obtained. The stretching temperature is
102 ° C.
【００２３】得られたポリエチレン系熱収縮フィルムの
熱収縮性は、縦方向、横方向それぞれ、１１０℃で５９
％、６０％で、低温での熱収縮性に優れていた。又、フ
ィルムの滑り性は、静摩擦係数が０．２６、動摩擦係数
が０．３０、透明性はヘイズ値が４．０％で良好であっ
た。更に、熱収縮包装適性試験の結果、フィルムがエア
ゾール缶に接している部分に皺が生じるようなこともな
く、良好なる包装仕上がりであった。又、得られた熱収
縮包装体は、２本のエアゾール缶を両手で容易に動かす
ことができず、結束力に優れていた。更に、フィルムが
エアゾール缶に接していない部分を強く指で押さないと
窪みが生ぜず、緊迫性に優れていた。The heat shrinkability of the obtained polyethylene-based heat shrinkable film was 59 ° C at 110 ° C. in each of the vertical and horizontal directions.
% And 60%, the heat shrinkability at low temperature was excellent. The slipperiness of the film was good with a static friction coefficient of 0.26 and a dynamic friction coefficient of 0.30, and transparency was good with a haze value of 4.0%. Furthermore, as a result of the heat shrink wrapping suitability test, the wrapping was excellent with no wrinkles occurring at the portion where the film was in contact with the aerosol can. Moreover, the obtained heat-shrinkable package was not able to easily move two aerosol cans with both hands, and was excellent in binding power. Furthermore, if the part where the film was not in contact with the aerosol can was pressed strongly with a finger, no dent was formed and the tightness was excellent.
【００２４】〔比較例１〕芯層に、密度０．９１５ｇ／
ｃｍ３、メルトインデックス１．０ｇ／１０ｍｉｎの直
鎖状低密度ポリエチレン樹脂９２ｗｔ％に環状オレフィ
ン系樹脂（三井石油化学株式会社製 商品名：ＡＰＬ８
００８Ｔ）を８ｗｔ％含有させた混合物を用い、両表面
層に、密度０．９２０ｇ／ｃｍ３、メルトインデックス
１．０ｇ／１０ｍｉｎの直鎖状低密度ポリエチレン樹脂
を用い、実施例１と同様、チューブ状多層未延伸原反を
製膜した。尚、未延伸原反の厚み構成は、表面層／芯層
／表面層が１／２／１であった。得られた未延伸原反を
再加熱し、インフレーション方式により縦方向、横方向
共に５倍に延伸して、厚み２０μｍのポリエチレン系熱
収縮フィルムを得た。尚、延伸温度は、１１２℃であっ
た。[Comparative Example 1] The core layer had a density of 0.915 g /
cm 3, melt index 1.0 g / 10min of the linear low-density polyethylene resin 92 wt% in the cycloolefin resin (Mitsui Petrochemical Co., Ltd. trade name: APL8
008T), a mixture containing 8 wt% of the same, and a linear low-density polyethylene resin having a density of 0.920 g / cm 3 and a melt index of 1.0 g / 10 min for both surface layers. A multilayer unstretched raw film was formed. The thickness configuration of the unstretched raw material was 1/2/1 for the surface layer / core layer / surface layer. The obtained unstretched raw material was reheated and stretched 5 times in both the longitudinal and transverse directions by an inflation method to obtain a polyethylene-based heat-shrinkable film having a thickness of 20 μm. The stretching temperature was 112 ° C.
【００２５】得られたポリエチレン系熱収縮フィルムの
熱収縮性は、縦方向、横方向それぞれ、１１０℃で４４
％、４８％で、低温での熱収縮性に劣っていた。又、フ
ィルムの滑り性は、静摩擦係数が０．２１、動摩擦係数
が０．１８、透明性はヘイズ値が３．５％であった。更
に、熱収縮包装適性試験の結果、フィルムがエアゾール
缶に接している部分に皺が生じ、良好なる包装仕上がり
ではなかった。しかし、得られた熱収縮包装体は、２本
のエアゾール缶を両手で容易に動かすことができず、結
束力に優れていた。更に、フィルムがエアゾール缶に接
していない部分を強く指で押さないと窪みが生ぜず、緊
迫性に優れていた。The heat shrinkability of the obtained heat shrinkable polyethylene film was 44 ° C. at 110 ° C. in each of the longitudinal and transverse directions.
% And 48%, the heat shrinkability at low temperature was inferior. The slip property of the film was 0.21 for the static friction coefficient, 0.18 for the dynamic friction coefficient, and the haze value for the transparency was 3.5%. Furthermore, as a result of the heat shrink wrapping suitability test, wrinkles were formed at the portion where the film was in contact with the aerosol can, and the packaging was not finished well. However, the obtained heat-shrinkable package was not able to easily move the two aerosol cans with both hands and was excellent in binding power. Furthermore, if the part where the film was not in contact with the aerosol can was pressed strongly with a finger, no dent was formed and the tightness was excellent.
【００２６】〔比較例２〕芯層に、密度０．８８０ｇ／
ｃｍ３、メルトインデックス１．０ｇ／１０ｍｉｎの直
鎖状極低密度ポリエチレン樹脂３０ｗｔ％と密度０．９
２０ｇ／ｃｍ３、メルトインデックス１．０ｇ／１０ｍ
ｉｎの直鎖状低密度ポリエチレン樹脂７０ｗｔ％の混合
物を用い、両表面層に、密度０．９２０ｇ／ｃｍ３、メ
ルトインデックス１．０ｇ／１０ｍｉｎの直鎖状低密度
ポリエチレン樹脂を用いる以外は、実施例１と同様、ポ
リエチレン系熱収縮性フィルムを得た。尚、延伸温度
は、１１０℃であった。得られたポリエチレン系熱収縮
フィルムの熱収縮性は、縦方向、横方向それぞれ、１１
０℃で４６％、４９％で、低温での熱収縮性に劣ってい
た。又、フィルムの滑り性は、静摩擦係数が０．３０、
動摩擦係数が０．２６、透明性はヘイズ値が３．０％で
あった。更に、熱収縮包装適性試験の結果、フィルムが
エアゾール缶に接している部分に多少皺が生じ、良好な
る包装仕上がりではなかった。しかも、又、得られた熱
収縮包装体は、２本のエアゾール缶を両手で容易に動か
すことができ、結束力に劣っていた。更に、フィルムが
エアゾール缶に接していない部分を指で押すと容易に窪
みが生じ、緊迫性に劣っていた。[Comparative Example 2] A density of 0.880 g /
cm 3 , 30 wt% of a linear very low density polyethylene resin having a melt index of 1.0 g / 10 min and a density of 0.9.
20 g / cm 3 , melt index 1.0 g / 10 m
The procedure was performed except that a mixture of 70% by weight of a linear low-density polyethylene resin was used for both the surface layers and a linear low-density polyethylene resin having a density of 0.920 g / cm 3 and a melt index of 1.0 g / 10 min. As in Example 1, a polyethylene heat-shrinkable film was obtained. The stretching temperature was 110 ° C. The heat-shrinkability of the obtained polyethylene-based heat-shrinkable film was 11 in each of the vertical and horizontal directions.
At 0 ° C., 46% and 49%, respectively, were inferior in heat shrinkability at low temperatures. The slip property of the film is such that the static friction coefficient is 0.30,
The coefficient of kinetic friction was 0.26, and the haze value of the transparency was 3.0%. Further, as a result of the heat shrink wrapping suitability test, a portion of the film in contact with the aerosol can was wrinkled, and the packaging was not finished well. Moreover, the obtained heat-shrinkable package can easily move the two aerosol cans with both hands, and has a poor binding power. Further, when a portion where the film is not in contact with the aerosol can is pressed with a finger, a depression is easily formed, resulting in poor tightness.
【００２７】[0027]
【効果】本発明のポリエチレン系熱収縮性フィルムは、
低温での熱収縮性に優れているので包装仕上がりの良好
な熱収縮包装体が得られ、しかも、得られた熱収縮包装
体は結束力と緊迫性に優れているので、取扱時や輸送時
等に熱収縮包装体の外観を悪化させるようなことがない
ので、実用包装上、非常に有用なものである。[Effect] The polyethylene heat-shrinkable film of the present invention comprises:
Excellent heat shrinkability at low temperatures provides a heat-shrinkable package with good packaging finish, and the obtained heat-shrinkable package has excellent binding power and tightness. It is very useful for practical packaging because it does not deteriorate the appearance of the heat-shrinkable package.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4F100 AK02A AK02B AK63A AK63B AL05A AL05B BA02 BA15 GB23 JA03 JA13A JA13B JL15 4J002 BB05W BB05X BB10X BB15W GF00 GG02 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F100 AK02A AK02B AK63A AK63B AL05A AL05B BA02 BA15 GB23 JA03 JA13A JA13B JL15 4J002 BB05W BB05X BB10X BB15W GF00 GG02
Claims (6)
９１０ｇ／ｃｍ３の直鎖状極低密度ポリエチレン樹脂を
含有する樹脂組成物からなり、少なくとも１層が環状オ
レフィン系樹脂を含有することを特徴とするポリエチレ
ン系熱収縮性フィルム。At least one layer has a density of 0.860-0.
A heat-shrinkable polyethylene film comprising a resin composition containing 910 g / cm 3 of a linear very low density polyethylene resin, wherein at least one layer contains a cyclic olefin resin.
／ｃｍ３の直鎖状極低密度ポリエチレン樹脂を含有する
樹脂組成物と環状オレフィン系樹脂からなり、表面層
が、密度０．９１０ｇ／ｃｍ３を越える直鎖状低密度ポ
リエチレン樹脂を含有する樹脂組成物からなることを特
徴とする請求項１記載のポリエチレン系熱収縮性フィル
ム。2. The core layer has a density of 0.860 to 0.910 g.
/ Cm 3 , a resin composition comprising a linear very low density polyethylene resin and a cyclic olefin resin, wherein the surface layer comprises a linear low density polyethylene resin having a density exceeding 0.910 g / cm 3. The polyethylene-based heat-shrinkable film according to claim 1, comprising a composition.
／ｃｍ３の直鎖状極低密度ポリエチレン樹脂を含有する
樹脂組成物からなり、表面層が、密度０．９１０ｇ／ｃ
ｍ３を越える直鎖状低密度ポリエチレン樹脂を含有する
樹脂組成物と環状オレフィン系樹脂からなることを特徴
とする請求項１記載のポリエチレン系熱収縮性フィル
ム。3. The core layer has a density of 0.860 to 0.910 g.
/ Cm 3 of a resin composition containing a linear very low density polyethylene resin, and the surface layer has a density of 0.910 g / c.
polyethylene heat-shrinkable film according to claim 1, characterized in that it consists of linear low-density containing polyethylene resin resin composition and a cyclic olefin resin exceeds m 3.
える直鎖状低密度ポリエチレン樹脂を含有する樹脂組成
物からなり、表面層が、密度０．８６０〜０．９１０ｇ
／ｃｍ３の直鎖状極低密度ポリエチレン樹脂を含有する
樹脂組成物と環状オレフィン系樹脂からなることを特徴
とする請求項１記載のポリエチレン系熱収縮性フィル
ム。4. The core layer comprises a resin composition containing a linear low-density polyethylene resin having a density exceeding 0.910 g / cm 3 , and the surface layer has a density of 0.860 to 0.910 g.
The polyethylene-based heat-shrinkable film according to claim 1, comprising a resin composition containing a linear / low-density polyethylene resin at / cm 3 and a cyclic olefin-based resin.
える直鎖状低密度ポリエチレン樹脂を含有する樹脂組成
物と環状オレフィン系樹脂からなり、表面層が、密度
０．８６０〜０．９１０ｇ／ｃｍ３の直鎖状極低密度ポ
リエチレン樹脂を含有する樹脂組成物からなることを特
徴とする請求項１記載のポリエチレン系熱収縮性フィル
ム。5. The core layer is composed of a resin composition containing a linear low-density polyethylene resin having a density exceeding 0.910 g / cm 3 and a cyclic olefin resin, and the surface layer has a density of 0.860-0. polyethylene heat-shrinkable film according to claim 1, characterized by comprising a resin composition containing a linear very low density polyethylene resin of 910 g / cm 3.
ポリエチレン樹脂の含有量が、５〜５０ｗｔ％で、しか
も、環状オレフィン系樹脂を含有する層の環状オレフィ
ン系樹脂含有量が２ｗｔ％以上で、１０ｗｔ％未満であ
ることを特徴とする請求項１〜５のいずれかに記載のポ
リエチレン系熱収縮性フィルム。6. The content of the linear very low-density polyethylene resin contained in the whole film is 5 to 50 wt%, and the cyclic olefin resin content of the layer containing the cyclic olefin resin is 2 wt% or more. The polyethylene-based heat-shrinkable film according to any one of claims 1 to 5, wherein the content is less than 10 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000210827A JP4555438B2 (en) | 2000-07-12 | 2000-07-12 | Polyethylene heat shrinkable film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000210827A JP4555438B2 (en) | 2000-07-12 | 2000-07-12 | Polyethylene heat shrinkable film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002019035A true JP2002019035A (en) | 2002-01-22 |
| JP4555438B2 JP4555438B2 (en) | 2010-09-29 |
Family
ID=18707036
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000210827A Expired - Lifetime JP4555438B2 (en) | 2000-07-12 | 2000-07-12 | Polyethylene heat shrinkable film |
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| Country | Link |
|---|---|
| JP (1) | JP4555438B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002146050A (en) * | 2000-11-10 | 2002-05-22 | Okura Ind Co Ltd | Polyethylene-based heat-shrinkable film having excellent not-slipping property |
| JP2008049506A (en) * | 2006-08-22 | 2008-03-06 | Mitsubishi Plastics Ind Ltd | Stretch-shrink laminated film and its manufacturing method |
| JP5854543B1 (en) * | 2014-07-31 | 2016-02-09 | 積水フィルム株式会社 | Heat-shrinkable film, multilayer heat-shrinkable film, and production method thereof |
| JP2016049775A (en) * | 2014-08-29 | 2016-04-11 | 日本ポリエチレン株式会社 | Easily tearable multilayer film and film for packaging heavy load |
| WO2016152248A1 (en) * | 2015-03-25 | 2016-09-29 | 積水フィルム株式会社 | Heat-shrinkable film, multilayered heat-shrinkable film, and production processes therefor |
| JP2018204002A (en) * | 2017-06-05 | 2018-12-27 | 旭化成株式会社 | Polyethylene resin composition, and polyethylene film |
| CN110785284A (en) * | 2017-05-19 | 2020-02-11 | 埃克森美孚化学专利公司 | Shrink films comprising a core of a cyclic-olefin copolymer |
| KR20200035313A (en) * | 2017-08-23 | 2020-04-02 | 다우 글로벌 테크놀로지스 엘엘씨 | Compositions containing ethylene-based polymers and cycloolefin interpolymers, and films formed therefrom |
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|---|---|---|---|---|
| JPH08267679A (en) * | 1995-03-28 | 1996-10-15 | Kohjin Co Ltd | Coextruded heat-shrinkable polyethylene film |
| JPH1177924A (en) * | 1997-09-12 | 1999-03-23 | Tousero Kk | Lamination film for twist packaging |
-
2000
- 2000-07-12 JP JP2000210827A patent/JP4555438B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08267679A (en) * | 1995-03-28 | 1996-10-15 | Kohjin Co Ltd | Coextruded heat-shrinkable polyethylene film |
| JPH1177924A (en) * | 1997-09-12 | 1999-03-23 | Tousero Kk | Lamination film for twist packaging |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002146050A (en) * | 2000-11-10 | 2002-05-22 | Okura Ind Co Ltd | Polyethylene-based heat-shrinkable film having excellent not-slipping property |
| JP2008049506A (en) * | 2006-08-22 | 2008-03-06 | Mitsubishi Plastics Ind Ltd | Stretch-shrink laminated film and its manufacturing method |
| JP5854543B1 (en) * | 2014-07-31 | 2016-02-09 | 積水フィルム株式会社 | Heat-shrinkable film, multilayer heat-shrinkable film, and production method thereof |
| JPWO2016152248A1 (en) * | 2014-07-31 | 2018-04-26 | 積水フィルム株式会社 | Heat-shrinkable film, multilayer heat-shrinkable film, and production method thereof |
| JP2016049775A (en) * | 2014-08-29 | 2016-04-11 | 日本ポリエチレン株式会社 | Easily tearable multilayer film and film for packaging heavy load |
| WO2016152248A1 (en) * | 2015-03-25 | 2016-09-29 | 積水フィルム株式会社 | Heat-shrinkable film, multilayered heat-shrinkable film, and production processes therefor |
| JP2020520829A (en) * | 2017-05-19 | 2020-07-16 | エクソンモービル ケミカル パテンツ インコーポレイテッド | Shrink film containing cyclic olefin copolymer core |
| CN110785284A (en) * | 2017-05-19 | 2020-02-11 | 埃克森美孚化学专利公司 | Shrink films comprising a core of a cyclic-olefin copolymer |
| US11141961B2 (en) | 2017-05-19 | 2021-10-12 | Exxonmobil Chemical Patents Inc. | Shrink films comprising a cyclic-olefin copolymer core |
| JP2018204002A (en) * | 2017-06-05 | 2018-12-27 | 旭化成株式会社 | Polyethylene resin composition, and polyethylene film |
| JP7306796B2 (en) | 2017-06-05 | 2023-07-11 | 旭化成株式会社 | Polyethylene-based resin composition, polyethylene-based film |
| KR20200035313A (en) * | 2017-08-23 | 2020-04-02 | 다우 글로벌 테크놀로지스 엘엘씨 | Compositions containing ethylene-based polymers and cycloolefin interpolymers, and films formed therefrom |
| KR102658187B1 (en) * | 2017-08-23 | 2024-04-18 | 다우 글로벌 테크놀로지스 엘엘씨 | Compositions containing ethylene-based polymers and cycloolefin interpolymers, and films formed therefrom |
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|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| EXPY | Cancellation because of completion of term |