JPH0143625B2 - - Google Patents
Info
- Publication number
- JPH0143625B2 JPH0143625B2 JP56157587A JP15758781A JPH0143625B2 JP H0143625 B2 JPH0143625 B2 JP H0143625B2 JP 56157587 A JP56157587 A JP 56157587A JP 15758781 A JP15758781 A JP 15758781A JP H0143625 B2 JPH0143625 B2 JP H0143625B2
- Authority
- JP
- Japan
- Prior art keywords
- density polyethylene
- ethylene
- laminated film
- layer
- low
- 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
Links
- 229920001903 high density polyethylene Polymers 0.000 claims description 19
- 239000004700 high-density polyethylene Substances 0.000 claims description 19
- 229920001684 low density polyethylene Polymers 0.000 claims description 17
- 239000004702 low-density polyethylene Substances 0.000 claims description 17
- 229920001038 ethylene copolymer Polymers 0.000 claims description 13
- 239000004711 α-olefin Substances 0.000 claims description 11
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 45
- 229920001577 copolymer Polymers 0.000 description 6
- 238000004806 packaging method and process Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229920006262 high density polyethylene film Polymers 0.000 description 2
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- WXCZUWHSJWOTRV-UHFFFAOYSA-N but-1-ene;ethene Chemical compound C=C.CCC=C WXCZUWHSJWOTRV-UHFFFAOYSA-N 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
Description
【発明の詳細な説明】
本発明は積層フイルムに関し、詳しくは機械的
強度が大きくしかも低温耐衝撃性などにすぐれた
積層フイルムに関する。
従来、肥料、米、麦などの重量物包装材として
は、低密度ポリエチレンフイルムや高密度ポリエ
チレンフイルムが用いられている。しかし、低密
度ポリエチレンフイルムは機械的強度が小さいた
め厚肉としなければならず、また高密度ポリエチ
レンフイルムはシール性や突起物に対する強さに
問題があると共に外観上も好ましいものではな
い。
そのため、最近上述のポリエチレンフイルムの
問題点を解消する目的で、また特に省資源の立場
からの薄肉化の要請に対して、各種の単層あるい
は積層フイルムが開発されている。例えば、(1)高
密度ポリエチレンにゴム類を添加したものを成形
してなるフイルム、(2)低密度ポリエチレンよりな
る層と高密度ポリエチレンよりなる層を積層した
フイルム、(3)高密度ポリエチレンとエチレン−α
−オレフイン共重合体とを混合した樹脂よりなる
層と低密度ポリエチレンよりなる層を積層したフ
イルムあるいは(4)高密度ポリエチレンを中間層と
して、この両面に外層としての低密度ポリエチレ
ン層を積層してなる三層積層フイルムなどがあ
る。
しかしながら、上記(1)のフイルムではシール性
は向上するものの機械的強度や外観の点で問題が
あり、また(2)のフイルムでは機械的強度や外観上
は特に支障はないが、シール性、パンクチヤー強
度、実用落下強度など必ずしも満足できるもので
はない。さらに(3)のフイルムでは剛性が充分でな
く、また自動包装に適さず、しかも内層を低密度
ポリエチレン層とする袋を製造した場合、ブロツ
キングしやすいため開口性に劣ると共に成形性や
外観が劣るという欠点がある。(4)のフイルムは光
学的性質にすぐれているものの、突起物に対する
強度や重量物包装におけるシール性が不足し、ま
たブロツキングしやすくしかも成形性が充分でな
いという欠点がある。
本発明は上記した従来のフイルムの欠点を解消
した積層フイルムを提供することを目的とし、そ
の構成は、少なくとも三層からなる積層フイルム
において、高密度ポリエチレンよりなる中間層
に、エチレン−α−オレフイン共重合体よりなる
外層と低密度ポリエチレンあるいはエチレン系共
重合体よりなる外層を光押出成形により積層して
なる積層フイルムである。また、本発明の構成の
別の態様は、上記中間層として高密度ポリエチレ
ンの代わりに高密度ポリエチレンとエチレン系共
重合体との樹脂混合物を用いたものである。
本発明の積層フイルムにおける中間層として
は、前述した如く高密度ポリエチレンあるいは高
密度ポリエチレンとエチレン系共重合体との樹脂
混合物が用いられる。ここで高密度ポリエチレン
は、密度0.945〜0.970ｇ／cm3、メルトインデツク
ス（MI）0.01〜2.0ｇ／10分のものが好適に使用
され、特にMI0.02〜1.0ｇ／10分のものが最適で
ある。一方、高密度ポリエチレンと共に用いられ
るエチレン系重合体としては、様々なものが考え
られるが、例えばエチレン−プロピレンゴム、エ
チレン−プロピレン−ジエンゴム等のエチレン系
ゴムあるいはエチレン−プロピレン共重合体、エ
チレン−ブテン−１共重合体等のエチレン−α−
オレフイン共重合体またはエチレン−酢酸ビニル
共重合体、エチレン−アクリル酸エチル共重合体
などのエチレン−不飽和エステル共重合体をあげ
ることができる。なおここでエチレン−α−オレ
フイン共重合体は、特に詳述する外層を構成する
エチレン−α−オレフイン共重合体と同じもので
あつてもよく、また異なるものであつてもよい。
積層フイルムの中間層として高密度ポリエチレ
ンとエチレン系共重合体との樹脂混合物を用いる
場合、この樹脂混合物における高密度ポリエチレ
ンとエチレン系共重合体との配合割合は各種条件
に応じて、適宜定めればよく特に制限はないが、
通常は高密度ポリエチレン95〜60重量％、エチレ
ン系共重合体５〜40重量％とすべきである。
次に、本発明の積層フイルムの両外層は、それ
ぞれ同一もしくは異なる種類の樹脂が用いられ
る。一方の外層としては、エチレン−α−オレフ
イン共重合体が好適に用いられる。このエチレン
−α−オレフイン共重合体の性状は特に制限され
るものではないが、通常は密度0.910〜0.940ｇ／
cm3、好ましくは0.915〜0.935ｇ／cm2とし、MI0.1
〜20ｇ／10分、好ましくは0.2〜10ｇ／10分とす
る。またこの共重合体中のα−オレフイン含量は
通常は１〜10モル％とすべきである。なお、ここ
でエチレンと共重合体を構成するα−オレフイン
は、炭素数３〜20のα−オレフインであり、具体
的にはプロピレン、ブテン−１、ペンテン−１、
ヘキセン−１，４−メチルペンテン−１、ノネン
−１などがあげられる。
これに対して他方の外層としては、低密度ポリ
エチレンあるいはエチレン系共重合体が用いられ
る。ここで低密度ポリエチレンの性状は適宜選定
すればよいが、通常は密度0.91〜0.94ｇ／cm3、好
ましくは0.915〜0.935ｇ／cm3とし、MIは0.2〜5.0
ｇ／10分、好ましくは0.3〜3.0ｇ／10分とすべき
である。なおこの外層としては、低密度ポリエチ
レンの代わりにエチレン系共重合体を用いること
ができるが、このエチレン系共重合体は前述した
中間層に用いたエチレン系共重合体と同種のもの
で差支えない。
本発明の積層フイルムは、三層からなる場合に
は上記中間層の両面に前述した二種類の外層を積
層するわけであるが、各種の層厚比は、通常は全
層の厚さに対して、両外層の厚さをそれぞれ１〜
40％の範囲とし、中間層を98〜50％の範囲で適宜
選定すべきである。外層の厚さの比率が大きくな
りすぎると、相対的に中間層の厚さの比率が小さ
くなり、その結果積層フイルム全体の機械的強度
が低下し好ましくない。なお本発明の積層フイル
ムは四層以上から構成することもできるが、その
場合には、それぞれの外層の材質に対して異なる
材質の層を使用目的などにより適宜積層すること
となる。
本発明の積層フイルムを成形するにあたつて
は、共押出成形により行なわれ、最も一般的に
は、エチレン−α−オレフイン共重合体よりなる
外層が内側の面となるようにしてブロー比2.5〜
7.0にてインフレーシヨン共押出成形して、両外
層および中間層を強固に結合させた状態で積層す
る。
このようにして得られた本発明の積層フイルム
は、材質の異なる各層がそれぞれの欠点を巧みに
補完しあい、全体として各種物性のすぐれたもの
となつている。具体的には、この積層フイルム
は、低密度ポリエチレンフイルム等に比べて強度
が大きいため薄肉化が可能であり、また低密度ポ
リエチレン、低密度ポリエチレン／高密度ポリエ
チレンあるいは低密度ポリエチレン／高密度ポリ
エチレン／低密度ポリエチレンなどのフイルムに
比べた成形性、特に積層した際の各層間の一体性
にすぐれている。さらに低温耐衝撃性にすぐれる
とともにヒートシール性が良好であり、しかも、
腰が強いため自動包装性にもすぐれている。その
上、印刷性にすぐれ外観上も美麗なものである。
従つて、本発明の積層フイルムは、フイルムあ
るいはシート状または袋状に成形して、各種物品
の包装に広くかつ有効に利用しうるものである。
次に本発明を実施例によりさらに詳しく説明す
る。
実施例１〜５および比較例１、２
外層Ａ（内面を形成）、中間層、および外層Ｂ
（外面を形成）を構成する所定の原料樹脂を、そ
れぞれの押出機により溶融混練し、ダイ内接着型
のサーキユラー・ダイに導入した後、ブロー比
4.3でインフレーシヨン成形し、厚さ50μの三層積
層フイルムを得た。得られたフイルムの各種物性
試験の結果を第１表に示す。なお試験方法は次の
如くである。
引張特性：JIS Ｚ 1702に準拠
引裂強度：JIS Ｐ 8116に準拠
パンクチヤー強度：JIS Ｚ 8401に準拠
シール強度：ASTM Ｄ 1822に準拠
比較例 ３、４
厚さ50μの単層フイルムとしたこと以外は、実
施例１に準じて成形を行なつた。得られたフイル
ムの各種物性試験の結果を第１表に示す。
【表】DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laminated film, and more particularly to a laminated film that has high mechanical strength and excellent low-temperature impact resistance. Conventionally, low-density polyethylene films and high-density polyethylene films have been used as packaging materials for heavy items such as fertilizer, rice, and wheat. However, low-density polyethylene film has low mechanical strength and must be thick, and high-density polyethylene film has problems in sealing performance and strength against protrusions, and is not desirable in terms of appearance. Therefore, various single-layer or laminated films have recently been developed in order to solve the above-mentioned problems with polyethylene films, and especially in response to requests for thinner films from the standpoint of resource conservation. For example, (1) a film made by molding high-density polyethylene with rubber added, (2) a film made by laminating a layer of low-density polyethylene and a layer of high-density polyethylene, and (3) a film made of high-density polyethylene and a layer of high-density polyethylene. Ethylene-α
- A film in which a layer made of a resin mixed with an olefin copolymer and a layer made of low density polyethylene are laminated, or (4) a high density polyethylene is used as an intermediate layer, and a low density polyethylene layer is laminated as an outer layer on both sides. There are three-layer laminated films. However, although the film in (1) improves the sealing performance, it has problems in terms of mechanical strength and appearance, and the film in (2) has no problems in terms of mechanical strength or appearance, but has problems in sealing performance and appearance. Puncture strength and practical drop strength are not always satisfactory. Furthermore, the film in (3) does not have sufficient rigidity and is not suitable for automatic packaging.Moreover, when a bag is manufactured with a low-density polyethylene layer as the inner layer, it tends to block, resulting in poor opening properties and poor formability and appearance. There is a drawback. Although the film (4) has excellent optical properties, it has the drawbacks of lacking strength against protrusions and sealing properties for packaging heavy items, being susceptible to blocking, and having insufficient moldability. An object of the present invention is to provide a laminated film that eliminates the drawbacks of the conventional films described above, and has a structure in which, in a laminated film consisting of at least three layers, ethylene-α-olefin is added to the middle layer made of high-density polyethylene. This is a laminated film made by laminating an outer layer made of a copolymer and an outer layer made of low density polyethylene or an ethylene copolymer by photoextrusion molding. In another embodiment of the structure of the present invention, a resin mixture of high-density polyethylene and an ethylene copolymer is used instead of high-density polyethylene as the intermediate layer. As described above, high density polyethylene or a resin mixture of high density polyethylene and an ethylene copolymer is used as the intermediate layer in the laminated film of the present invention. Here, high-density polyethylene having a density of 0.945 to 0.970 g/cm 3 and a melt index (MI) of 0.01 to 2.0 g/10 minutes is preferably used, particularly one having an MI of 0.02 to 1.0 g/10 minutes. Optimal. On the other hand, various ethylene polymers can be used with high-density polyethylene, including ethylene rubbers such as ethylene-propylene rubber, ethylene-propylene-diene rubber, ethylene-propylene copolymers, and ethylene-butene rubbers. Ethylene-α- such as -1 copolymer
Examples include olefin copolymers and ethylene-unsaturated ester copolymers such as ethylene-vinyl acetate copolymers and ethylene-ethyl acrylate copolymers. Here, the ethylene-α-olefin copolymer may be the same as the ethylene-α-olefin copolymer constituting the outer layer, which will be described in detail, or may be different. When using a resin mixture of high density polyethylene and ethylene copolymer as the intermediate layer of a laminated film, the blending ratio of high density polyethylene and ethylene copolymer in this resin mixture may be determined as appropriate depending on various conditions. There are no particular restrictions, but
Usually, the content should be 95-60% by weight of high-density polyethylene and 5-40% by weight of ethylene copolymer. Next, the same or different types of resins are used for both outer layers of the laminated film of the present invention. As one outer layer, an ethylene-α-olefin copolymer is suitably used. The properties of this ethylene-α-olefin copolymer are not particularly limited, but usually have a density of 0.910 to 0.940 g/
cm3 , preferably 0.915-0.935g/ cm2 , MI0.1
~20g/10min, preferably 0.2~10g/10min. Also, the alpha-olefin content in this copolymer should normally be between 1 and 10 mole percent. Note that the α-olefin that constitutes the copolymer with ethylene is an α-olefin having 3 to 20 carbon atoms, and specifically includes propylene, 1-butene, 1-pentene,
Examples include hexene-1,4-methylpentene-1 and nonene-1. On the other hand, for the other outer layer, low density polyethylene or ethylene copolymer is used. Here, the properties of the low density polyethylene may be selected appropriately, but the density is usually 0.91 to 0.94 g/cm 3 , preferably 0.915 to 0.935 g/cm 3 , and the MI is 0.2 to 5.0.
g/10 min, preferably 0.3-3.0 g/10 min. Note that for this outer layer, an ethylene copolymer can be used instead of low-density polyethylene, but this ethylene copolymer may be of the same type as the ethylene copolymer used for the above-mentioned intermediate layer. . When the laminated film of the present invention is composed of three layers, the two types of outer layers described above are laminated on both sides of the above-mentioned intermediate layer, and the various layer thickness ratios are usually adjusted to the thickness of all layers. and set the thickness of both outer layers to 1~
It should be in the range of 40%, and the middle layer should be selected appropriately in the range of 98-50%. If the ratio of the thickness of the outer layer becomes too large, the ratio of the thickness of the intermediate layer becomes relatively small, and as a result, the mechanical strength of the entire laminated film decreases, which is not preferable. Note that the laminated film of the present invention may be composed of four or more layers, but in that case, layers made of different materials are laminated as appropriate depending on the purpose of use and the like with respect to the material of each outer layer. The laminated film of the present invention is formed by coextrusion, and most commonly, the outer layer made of ethylene-α-olefin copolymer is formed on the inner surface at a blowing ratio of 2.5. ~
Inflation coextrusion molding is performed at 7.0 to laminate both outer layers and the intermediate layer in a state in which they are firmly bonded. The thus obtained laminated film of the present invention has excellent physical properties as a whole, with each layer made of different materials skillfully complementing each other's defects. Specifically, this laminated film has greater strength than low-density polyethylene films, so it can be made thinner, and it can also be made into low-density polyethylene, low-density polyethylene/high-density polyethylene, or low-density polyethylene/high-density polyethylene/ It has superior moldability compared to films such as low-density polyethylene, especially the integrity of each layer when laminated. Furthermore, it has excellent low-temperature impact resistance and good heat sealability, and
Because it is strong, it also has excellent automatic packaging properties. Moreover, it has excellent printability and a beautiful appearance. Therefore, the laminated film of the present invention can be formed into a film, sheet, or bag and can be widely and effectively used for packaging various articles. Next, the present invention will be explained in more detail with reference to Examples. Examples 1 to 5 and Comparative Examples 1 and 2 Outer layer A (forming the inner surface), intermediate layer, and outer layer B
(forming the outer surface) is melt-kneaded by each extruder, introduced into a circular die with adhesive inside the die, and then the blowing ratio is
4.3 to obtain a three-layer laminated film with a thickness of 50μ. Table 1 shows the results of various physical property tests on the obtained film. The test method is as follows. Tensile properties: Compliant with JIS Z 1702 Tear strength: Compliant with JIS P 8116 Puncture strength: Compliant with JIS Z 8401 Seal strength: Compliant with ASTM D 1822 Comparative examples 3 and 4 Except for using a single layer film with a thickness of 50μ. Molding was carried out according to Example 1. Table 1 shows the results of various physical property tests on the obtained film. 【table】
Claims (1)
て、高密度ポリエチレンよりなる中間層に、密度
0.910〜0.940ｇ／cm3、メルトインデツクス0.1〜20
ｇ／10分のエチレン−α−オレフイン共重合体よ
りなる外層と低密度ポリエチレンあるいはエチレ
ン系共重合体よりなる外層を共押出成形により積
層してなる積層フイルム。 ２ 少なくとも三層からなる積層フイルムにおい
て、高密度ポリエチレンとエチレン系共重合体と
の樹脂混合物よりなる中間層に、密度0.910〜
0.940ｇ／cm3、メルトインデツクス0.1〜20ｇ／10
分のエチレン−α−オレフイン共重合体よりなる
外層と低密度ポリエチレンあるいはエチレン系共
重合体よりなる外層を共押出成形により積層して
なる積層フイルム。[Claims] 1. In a laminated film consisting of at least three layers, an intermediate layer made of high-density polyethylene has a density
0.910~0.940g/ cm3 , melt index 0.1~20
A laminated film formed by laminating an outer layer made of an ethylene-α-olefin copolymer with a weight ratio of 10 g/10 min and an outer layer made of a low-density polyethylene or an ethylene copolymer by coextrusion molding. 2 In a laminated film consisting of at least three layers, the intermediate layer made of a resin mixture of high density polyethylene and an ethylene copolymer has a density of 0.910 to
0.940g/ cm3 , melt index 0.1~20g/10
A laminated film obtained by laminating an outer layer made of an ethylene-α-olefin copolymer and an outer layer made of low density polyethylene or an ethylene copolymer by coextrusion molding.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15758781A JPS5859080A (en) | 1981-10-05 | 1981-10-05 | Laminated film |
| DE198282303397T DE69526T1 (en) | 1981-07-04 | 1982-06-29 | PACKAGING BAGS. |
| EP82303397A EP0069526B1 (en) | 1981-07-04 | 1982-06-29 | Packaging bags |
| DE8282303397T DE3267899D1 (en) | 1981-07-04 | 1982-06-29 | Packaging bags |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15758781A JPS5859080A (en) | 1981-10-05 | 1981-10-05 | Laminated film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5859080A JPS5859080A (en) | 1983-04-07 |
| JPH0143625B2 true JPH0143625B2 (en) | 1989-09-21 |
Family
ID=15652958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15758781A Granted JPS5859080A (en) | 1981-07-04 | 1981-10-05 | Laminated film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5859080A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020197175A1 (en) * | 2019-03-22 | 2020-10-01 | 유수영 | Sterilization, deodorization, and virus infection prevention technology using natural substances |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5911252A (en) * | 1982-07-12 | 1984-01-20 | 出光石油化学株式会社 | Laminated film |
| JPS6067152A (en) * | 1983-09-22 | 1985-04-17 | 出光石油化学株式会社 | Laminated film and manufacture thereof |
| JPH0616744Y2 (en) * | 1989-11-08 | 1994-05-02 | 大成ラミック株式会社 | Laminated film for packaging |
| JP6690467B2 (en) * | 2016-08-25 | 2020-04-28 | 日本ポリエチレン株式会社 | Coextruded film and multilayer coextruded laminate |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54135875A (en) * | 1978-04-14 | 1979-10-22 | Mitsui Toatsu Chem Inc | Laminated film |
-
1981
- 1981-10-05 JP JP15758781A patent/JPS5859080A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54135875A (en) * | 1978-04-14 | 1979-10-22 | Mitsui Toatsu Chem Inc | Laminated film |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020197175A1 (en) * | 2019-03-22 | 2020-10-01 | 유수영 | Sterilization, deodorization, and virus infection prevention technology using natural substances |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5859080A (en) | 1983-04-07 |
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