JPH021668B2 - - Google Patents
Info
- Publication number
- JPH021668B2 JPH021668B2 JP59026117A JP2611784A JPH021668B2 JP H021668 B2 JPH021668 B2 JP H021668B2 JP 59026117 A JP59026117 A JP 59026117A JP 2611784 A JP2611784 A JP 2611784A JP H021668 B2 JPH021668 B2 JP H021668B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- ethylene
- multilayer film
- intermediate layer
- weight
- 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.)
- Expired - Lifetime
Links
- 239000004743 Polypropylene Substances 0.000 claims description 12
- -1 polypropylene Polymers 0.000 claims description 12
- 229920001155 polypropylene Polymers 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 10
- 239000004711 α-olefin Substances 0.000 claims description 10
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims description 8
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 8
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 7
- 239000011342 resin composition Substances 0.000 claims description 6
- 229920001384 propylene homopolymer Polymers 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 description 15
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 6
- 239000005977 Ethylene Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 5
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000005022 packaging material Substances 0.000 description 4
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 4
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 4
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- PRBHEGAFLDMLAL-GQCTYLIASA-N (4e)-hexa-1,4-diene Chemical compound C\C=C\CC=C PRBHEGAFLDMLAL-GQCTYLIASA-N 0.000 description 1
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920005629 polypropylene homopolymer Polymers 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
Description
本発明は多層フイルムに関し、詳しくは耐寒性
にすぐれており、しかも自動包装適性の良好な多
層フイルムに関する。
従来、食パン、箱入り菓子などの食品類、煙草
等はオーバーラツプ包装することが行なわれてお
り、また食品包装、例えばトレー包装等にはスト
レツチ包装が採用されている。これら包装は包装
材を使用して物品を包装した後、ヒートシールす
ることにより行なわれるものであり、包装材であ
るフイルムとしては、適度の剛性に加えてヒート
シール温度範囲の広いことが要求されている。こ
の要求を満たすものとして、ポリプロピレンを中
間層として、その両面に低密度のポリエチレンや
エチレン−酢酸ビニル共重合体を積層した多層フ
イルムが提案されている。しかしながら、これら
のフイルムは上記要求は満たしているものの、耐
寒性が極めて劣り、厳寒期や寒冷地での使用の際
に破袋やすいという大きな欠点がある。このた
め、中間層をなすポリプロピレンにエチレン−酢
酸ビニル共重合体をを配合したり、プロピレンに
エチレンを共重合体したりすることの他、中間層
と両外層との間に低密度ポリエチレンと高密度ポ
リエチレンのブレンド層を設けて五層フイルムと
することなどが提案されている。しかしながら、
これらのフイルムは剛性や耐熱性の低下により自
動包装適性が低下してしまつたり、また製造法が
複雑となり高価になつてしまうなどの欠点があ
り、未が十分に満足しうるものは得られていな
い。
本発明は上記従来の欠点を解消し、耐寒性が良
好であつて厳寒期や寒冷地での使用の際にも破袋
する虞れがなく、かつフイルムの剛性が適度であ
り、しかも耐熱性にすぐれていて自動包装適性の
良好な多層フイルムを提供することを目的とする
ものである。
すなわち本発明は、ポリプロピレン系樹脂およ
び低結晶性エチレン−α−オレフイン共重合体を
配合してなる樹脂組成物よりなる層を中間層と
し、該中間層の両面にエチレン−酢酸ビニル共重
合体よりなる外層が形成されている多層フイルム
を提供すものである。
本発明の多層フイルムにおいて中間層として
は、上記の如くポリプロピレン系樹脂および低結
晶性エチレン−α−オレフイン共重合体を配合し
てなる樹脂組成物が用いられる。
ここでポリプロピレン系樹脂としては、各種の
ものを使用することができるが、一般に密度が
0.895〜0.915ｇ／cm3の範囲のものであり、メルト
インデツクス（MI）が1.0〜20ｇ／10分の範囲の
のものである。これらポリプロピレン系樹脂とし
てはプロピレン単独重合体の他、プロピレンと５
重量％以下、好ましくは３重量％以下の他のα−
オレフイン（エチレン、ブテン−１、ヘキセン−
１、４−メチルペンテン−１など）とのランダム
共重合体などを挙げることができる。これらの中
でもとりわけプロピレン単独重合体を用いること
により一層耐熱性にすぐれた多層フイルムを得る
ことができる。
また、本発明の多層フイルムにの中間層をなす
樹脂組成物中の他方の成分としての低結晶性エチ
レン−α−オレフイン共重合体としは、エチレン
と炭素数３〜20のα−オレフイン、例えばプロピ
レン、ブテン−１、ペンテン−１、ヘキセン−１
などとの共重合体が用いられ、とりわけ、エチレ
ン−プロピレンラバー（EPR）、エチレン−ブテ
ン−１共重合体が好適に用いられる。これら共重
合体としては、第三成分として１，４−ヘキサジ
エン、５−メチレン−２ノルボルナンなどのジエ
ン類との三元共重合体であつてもよい。これら共
重合体の密度としては通常0.85〜0.91ｇ／cm3、好
ましくは0.85〜0.90ｇ／cm3である。また、エチレ
ン含量は40〜90モル％、結晶化度は20以下のもの
である。ここで結晶化度が20を越えると、本発明
の目的である耐寒性を改良することができない。
上記のポリプロピレン系樹脂と低結晶性エチレ
ン−α−オレフイン共重合体との配合割合は、通
常前者78〜90重量％に対し後者22〜10重量％、好
ましくは前者80〜85重量％に対し後者20〜15重量
％である。ここで後者の低結晶性エチレン−α−
オレフイン共重合体の配合割合が10重量％未満で
あると、耐寒性を向上せしめる効果がなく、一方
22重量％を越えると、耐熱性、剛性が低下し、ヒ
ートシール温度範囲が狭くなるので好ましくな
い。
次に上記中間層の両面に形成される両外層はエ
チレン−酢酸ビニル共重合体よりなるものであ
る。この共重合体のの酢酸ビニル含量は３〜50重
量％、好ましくは５〜30重量％であり、MIは１
〜50ｇ／10分、好ましくは２〜30ｇ／10分であ
る。また、密度は0.910〜0.950ｇ／cm3、好ましく
は0.920〜0.940ｇ／cm3である。なお、両外層を形
成するエチレン−酢酸ビニル共重合体は全く同一
のものであつてもよく、或いは異なるものであつ
てもよい。
本発明の多層フイルムは上記中間層と両外層の
三層からなるものであるが、ここで外層：中間
層：外層の比は特に制限なく、オーバーラツプ包
装に用いる場合３〜20：94〜60：３〜20、好まし
くは４〜10：92〜80：４〜10である。ここで各層
の比が範囲外であるとヒートシール時のシール温
度範囲が狭くなり好ましくない。また、ストレツ
チ包装に用いる場合、外層：中間層：外層の比は
５〜40：90〜20：５〜40、好ましくは10〜30：80
〜40：10〜30である。ここで各層の比がこの範囲
外であるとストレツチ包装適性が十分でなく好ま
しくない。
本発明の多層フイルムは共押出成形法により成
形され、より具体的にはサーキユラーダイを用い
るインフレーシヨン法、フラツトダイを用いるＴ
ダイ共押出成形法が適用される。
叙上の如き本発明の多層フイルムは、中間層と
してポリプロピレン系樹脂と低結晶性エチレン−
α−オレフイン共重合体を配合してなる樹脂組成
物よりなる層を用いているため、耐寒性が良好で
あつて、低温衝撃強度が高く、厳寒期や寒冷地で
の使用に際しても破袋する虞れがない。
また、本発明の多層フイルムは、フイルムの剛
性が適度であつり、しかも耐熱性にすぐれヒート
シールの許容温度範囲が広いなど自動包装適性も
良好である。
したがつて、本発明の多層フイルムは食品、雑
化などのオーバーラツプ包装用資材、ストレツチ
包装用資材として極めて有用である。
次に、本発明を実施例によつて詳しく説明す
る。
実施例 １〜４
中間層の成分としてポリプロピレンホモポリマ
ー（ホモ・PP）（密度0.91ｇ／cm3、MI7ｇ／10分）
および低結晶性エチレン−プロピレン共重合体
（EPR）（密度0.86ｇ／cm3、MI2.1ｇ／cm310分
（190℃）、ムーニー粘度ML1+4（100℃）20、プロ
ピレン含量23重量％）を第１表に示す所定割合で
配合した樹脂組成物を用い、両外層（すなわち、
内層と外層）の成分としてエチレン−酢酸ビニル
共重合体（EVA）（密度0.927ｇ／cm3、MI9ｇ／10
分、酢酸ビニル含量10重量％）を用い、これら原
料を三台の押出成形機を用いて溶融混練押出し、
温度240℃の三層マルチマニホールド型Ｔダイか
ら共押出して、外層／中間層／内層の層比が３／
44／３である厚さ25μの三層フイルムを得た。
得られた三層フイルムの各種物性の測定結果お
よびオーバーラツプ包装機械における実用評価結
果を第１表に示す
比較例 １〜４
実施１〜４において、中間層の成分を第１表に
示す如く種々変えたこと以外は実施例１〜４と同
様にして三層フイルムを得た。
得られた三層フイルムの各種物性の測定結果お
よびオーバーラツプ包装機械における実用評価結
果を第１表に示す。
The present invention relates to a multilayer film, and more particularly to a multilayer film that has excellent cold resistance and is suitable for automatic packaging. Conventionally, food products such as bread, boxed confectionery, and cigarettes have been wrapped in overlap packaging, and stretch packaging has been used for food packaging, such as tray packaging. These types of packaging are performed by wrapping the product using a packaging material and then heat-sealing it, and the film used as the packaging material is required to have a wide heat-sealing temperature range in addition to appropriate rigidity. ing. To meet this requirement, a multilayer film has been proposed in which polypropylene is used as an intermediate layer and low-density polyethylene or ethylene-vinyl acetate copolymer is laminated on both sides of the intermediate layer. However, although these films meet the above requirements, they have a major drawback in that they are extremely poor in cold resistance and easily break when used in extremely cold seasons or in cold regions. For this reason, in addition to blending ethylene-vinyl acetate copolymer into the polypropylene that forms the middle layer, or mixing ethylene with propylene, low-density polyethylene and high-density polyethylene are used between the middle layer and both outer layers. It has been proposed to provide a blend layer of density polyethylene to form a five-layer film. however,
These films have drawbacks such as reduced suitability for automatic packaging due to reduced rigidity and heat resistance, and are expensive due to complicated manufacturing methods. Not yet. The present invention solves the above-mentioned conventional drawbacks, has good cold resistance, eliminates the risk of bag tearing even when used in extremely cold seasons or in cold regions, has appropriate film rigidity, and has heat resistance. The object of the present invention is to provide a multilayer film that is excellent in packaging properties and suitable for automatic packaging. That is, in the present invention, a layer made of a resin composition blended with a polypropylene resin and a low-crystalline ethylene-α-olefin copolymer is used as an intermediate layer, and an ethylene-vinyl acetate copolymer is coated on both sides of the intermediate layer. The present invention provides a multilayer film in which an outer layer is formed. In the multilayer film of the present invention, a resin composition containing a polypropylene resin and a low crystalline ethylene-α-olefin copolymer as described above is used as the intermediate layer. Various types of polypropylene resins can be used here, but generally the density is
It is in the range of 0.895 to 0.915 g/cm 3 and the melt index (MI) is in the range of 1.0 to 20 g/10 min. These polypropylene resins include propylene homopolymers, propylene and
Not more than 3% by weight, preferably not more than 3% by weight of other α-
Olefin (ethylene, butene-1, hexene-
Examples include random copolymers with 1,4-methylpentene-1, etc.). Among these, by using a propylene homopolymer, a multilayer film with even better heat resistance can be obtained. Furthermore, the low crystalline ethylene-α-olefin copolymer as the other component in the resin composition forming the intermediate layer of the multilayer film of the present invention includes ethylene and α-olefin having 3 to 20 carbon atoms, such as ethylene and α-olefin having 3 to 20 carbon atoms. Propylene, butene-1, pentene-1, hexene-1
Ethylene-propylene rubber (EPR) and ethylene-butene-1 copolymer are particularly preferably used. These copolymers may be terpolymers with dienes such as 1,4-hexadiene and 5-methylene-2-norbornane as the third component. The density of these copolymers is usually 0.85 to 0.91 g/cm 3 , preferably 0.85 to 0.90 g/cm 3 . Further, the ethylene content is 40 to 90 mol%, and the crystallinity is 20 or less. If the degree of crystallinity exceeds 20, the cold resistance, which is the objective of the present invention, cannot be improved. The blending ratio of the polypropylene resin and the low crystalline ethylene-α-olefin copolymer is usually 78-90% by weight of the former and 22-10% by weight of the latter, preferably 80-85% by weight of the former and the latter. It is 20-15% by weight. Here, the latter low crystalline ethylene-α-
If the blending ratio of the olefin copolymer is less than 10% by weight, there will be no effect of improving cold resistance;
If it exceeds 22% by weight, the heat resistance and rigidity will decrease and the heat sealing temperature range will become narrow, which is not preferable. Next, both outer layers formed on both sides of the intermediate layer are made of ethylene-vinyl acetate copolymer. The vinyl acetate content of this copolymer is 3 to 50% by weight, preferably 5 to 30% by weight, and the MI is 1.
~50 g/10 min, preferably 2-30 g/10 min. Further, the density is 0.910 to 0.950 g/cm 3 , preferably 0.920 to 0.940 g/cm 3 . The ethylene-vinyl acetate copolymers forming both outer layers may be the same or different. The multilayer film of the present invention is composed of three layers, the above-mentioned intermediate layer and both outer layers, and the ratio of outer layer:intermediate layer:outer layer is not particularly limited, and when used for overlap packaging, it is 3 to 20:94 to 60: The ratio is 3 to 20, preferably 4 to 10:92 to 80:4 to 10. Here, if the ratio of each layer is outside the range, the sealing temperature range during heat sealing will be narrowed, which is not preferable. When used for stretch packaging, the ratio of outer layer: middle layer: outer layer is 5 to 40:90 to 20:5 to 40, preferably 10 to 30:80.
~40:10-30. If the ratio of each layer is outside this range, the suitability for stretch packaging will be insufficient, which is undesirable. The multilayer film of the present invention is molded by a coextrusion method, more specifically an inflation method using a circular die, a T film method using a flat die, etc.
A die coextrusion method is applied. The multilayer film of the present invention as described above comprises a polypropylene resin and a low crystalline ethylene resin as an intermediate layer.
Because it uses a layer made of a resin composition containing an α-olefin copolymer, it has good cold resistance and high low-temperature impact strength, and the bag does not break even when used in extremely cold seasons or in cold regions. There is no danger. Further, the multilayer film of the present invention has moderate film rigidity, excellent heat resistance, and has a wide allowable temperature range for heat sealing, making it suitable for automatic packaging. Therefore, the multilayer film of the present invention is extremely useful as an overlapping packaging material for foods, miscellaneous goods, etc., and as a stretch packaging material. Next, the present invention will be explained in detail with reference to Examples. Examples 1 to 4 Polypropylene homopolymer (homo-PP) as a component of the intermediate layer (density 0.91 g/cm 3 , MI 7 g/10 min)
and low crystalline ethylene-propylene copolymer (EPR) (density 0.86 g/cm 3 , MI 2.1 g/cm 3 10 min (190°C), Mooney viscosity ML 1+4 (100°C) 20, propylene content 23 wt. %) in the predetermined proportions shown in Table 1, both outer layers (i.e.
Ethylene-vinyl acetate copolymer (EVA) (density 0.927g/cm 3 , MI9g/10) as a component of the inner layer and outer layer)
These raw materials were melt-kneaded and extruded using three extrusion molding machines.
Coextruded from a three-layer multi-manifold type T-die at a temperature of 240°C, the layer ratio of outer layer/middle layer/inner layer is 3/
A 25μ thick three-layer film of 44/3 was obtained. Comparative Examples 1 to 4 The measurement results of various physical properties of the obtained three-layer film and the practical evaluation results in the overlap packaging machine are shown in Table 1.Comparative Examples 1 to 4 In Examples 1 to 4, the components of the intermediate layer were variously changed as shown in Table 1. A three-layer film was obtained in the same manner as in Examples 1 to 4 except for the above. Table 1 shows the measurement results of various physical properties of the obtained three-layer film and the results of practical evaluation on an overlap packaging machine.
【表】
＊７〓△…使用は可能であるが不十分
[Table] *7〓△…Can be used but insufficient
Claims (1)
ン−α−オレフイン共重合体を配合してなる樹脂
組成物よりなる層を中間層とし、該中間層の両面
にエチレン−酢酸ビニル共重合体よりなる外層が
形成されている多層フイルム。 ２ ポリプロピレン系樹脂がプロピレン単独重合
体である特許請求の範囲第１項記載の多層フイル
ム。 ３ 樹脂組成物がポリプロピレン系樹脂78〜90重
量％および低結晶性エチレン−α−オレフイン共
重合体22〜10重量％を配合したものである特許請
求の範囲第１項記載の多層フイルム。[Scope of Claims] 1. A layer made of a resin composition blended with a polypropylene resin and a low-crystalline ethylene-α-olefin copolymer is used as an intermediate layer, and an ethylene-vinyl acetate copolymer is coated on both sides of the intermediate layer. A multilayer film whose outer layer is formed by merging. 2. The multilayer film according to claim 1, wherein the polypropylene resin is a propylene homopolymer. 3. The multilayer film according to claim 1, wherein the resin composition contains 78 to 90% by weight of a polypropylene resin and 22 to 10% by weight of a low-crystalline ethylene-α-olefin copolymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2611784A JPS60171148A (en) | 1984-02-16 | 1984-02-16 | Multilayer film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2611784A JPS60171148A (en) | 1984-02-16 | 1984-02-16 | Multilayer film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60171148A JPS60171148A (en) | 1985-09-04 |
| JPH021668B2 true JPH021668B2 (en) | 1990-01-12 |
Family
ID=12184630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2611784A Granted JPS60171148A (en) | 1984-02-16 | 1984-02-16 | Multilayer film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60171148A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2568127B2 (en) * | 1990-03-09 | 1996-12-25 | 日本ユニカー株式会社 | Stretch wrap film |
| JPH1177927A (en) * | 1997-09-05 | 1999-03-23 | Okamoto Ind Inc | Food packaging stretched film |
| JP4680336B2 (en) * | 1999-05-20 | 2011-05-11 | 電気化学工業株式会社 | Non-vinyl chloride stretch film |
| EP3019334B1 (en) * | 2013-07-12 | 2022-03-30 | UPM Raflatac Oy | Multilayer film for label and a method for providing such |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4933341A (en) * | 1972-08-02 | 1974-03-27 | ||
| JPS5119032A (en) * | 1974-08-09 | 1976-02-16 | Mitsui Petrochemical Ind | HORIOREFUIN FUIRUMUYOSETSUCHAKUZAI |
| JPS52126487A (en) * | 1976-04-16 | 1977-10-24 | Toyobo Co Ltd | Laminated films of polypropylene |
| JPS56120343A (en) * | 1980-01-25 | 1981-09-21 | Mobil Oil | Thermoplastic film for packing having improved thermoosealing characteristic and its manufacture |
| JPS58157839A (en) * | 1982-03-16 | 1983-09-20 | Nippon Oil Co Ltd | Impact-resistant polyolefin resin composition |
| JPS6320862A (en) * | 1986-07-15 | 1988-01-28 | Toshiba Corp | Original plate for lead frame and lend frame |
-
1984
- 1984-02-16 JP JP2611784A patent/JPS60171148A/en active Granted
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4933341A (en) * | 1972-08-02 | 1974-03-27 | ||
| JPS5119032A (en) * | 1974-08-09 | 1976-02-16 | Mitsui Petrochemical Ind | HORIOREFUIN FUIRUMUYOSETSUCHAKUZAI |
| JPS52126487A (en) * | 1976-04-16 | 1977-10-24 | Toyobo Co Ltd | Laminated films of polypropylene |
| JPS56120343A (en) * | 1980-01-25 | 1981-09-21 | Mobil Oil | Thermoplastic film for packing having improved thermoosealing characteristic and its manufacture |
| JPS58157839A (en) * | 1982-03-16 | 1983-09-20 | Nippon Oil Co Ltd | Impact-resistant polyolefin resin composition |
| JPS6320862A (en) * | 1986-07-15 | 1988-01-28 | Toshiba Corp | Original plate for lead frame and lend frame |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60171148A (en) | 1985-09-04 |
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