JP3460862B2 - Ethylene copolymer composition and easy-open seal material using the same - Google Patents
Ethylene copolymer composition and easy-open seal material using the sameInfo
- Publication number
- JP3460862B2 JP3460862B2 JP18524194A JP18524194A JP3460862B2 JP 3460862 B2 JP3460862 B2 JP 3460862B2 JP 18524194 A JP18524194 A JP 18524194A JP 18524194 A JP18524194 A JP 18524194A JP 3460862 B2 JP3460862 B2 JP 3460862B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- ethylene
- composition
- copolymer
- 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 - Fee Related
Links
Landscapes
- Packages (AREA)
- Wrappers (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、新規なエチレン共重合
体組成物に関する。さらに詳しくは、易開封性シール材
料として好適なエチレン共重合体組成物及びこれを用い
た包装材料に関する。FIELD OF THE INVENTION The present invention relates to a novel ethylene copolymer composition. More specifically, the present invention relates to an ethylene copolymer composition suitable as an easily-openable sealing material and a packaging material using the same.
【０００２】[0002]
【従来の技術】カップ麺、ゼリー、ヨーグルト、豆腐な
ど各種飲食品や医薬品の容器として、易開封性蓋材を備
えたプラスチック容器が広く使用されている。このよう
な易開封性蓋材のシール層に用いられる熱溶融型接着剤
として種々のものが提案され、実用化されてきた。例え
ばエチレン・酢酸ビニル共重合体やエチレン・アクリル
酸エチル共重合体と粘着付与剤の組成物、これにポリエ
チレンや低結晶性エチレン・α−オレフィン共重合体な
どを配合した組成物などが、密封性と易開封性とを備え
た優れたシール材となることが知られている。しかしな
がら容器に用いられるプラスチック材料の種類も増え、
新しい材料に対しては、従来のシール材では十分に対応
できないものがあり、新たなシール材の出現が望まれて
いる。また既存のプラスチック材料を使用した容器であ
っても、用途によって望まれるヒートシール強度の値が
異なっており、そのため種々のヒートシール強度に容易
に調整することができるシート材料も望まれている。2. Description of the Related Art Plastic containers provided with easy-open lids are widely used as containers for various foods and drinks such as cup noodles, jellies, yogurts, tofu, and pharmaceuticals. Various types of hot-melt adhesives have been proposed and put to practical use as the sealant layer of such an easily-openable lid material. For example, a composition of ethylene / vinyl acetate copolymer or ethylene / ethyl acrylate copolymer and a tackifier, or a composition obtained by blending polyethylene or a low crystalline ethylene / α-olefin copolymer, etc. is hermetically sealed. It is known that it becomes an excellent sealing material having excellent properties and easy opening property. However, the types of plastic materials used for containers have increased,
As for new materials, there are some materials that cannot be adequately dealt with by conventional sealing materials, and the advent of new sealing materials is desired. Further, even in a container using an existing plastic material, the desired value of the heat seal strength differs depending on the application, and therefore, a sheet material that can be easily adjusted to various heat seal strengths is also desired.
【０００３】例えば、近年、耐衝撃性ポリスチレンが各
種容器に使用されるようになってきたが、上記のような
シール材を用いると、あるものはシール強度が小さく、
あるものは初期シール強度として充分な値を示すが経時
的にシール強度が低下するといった欠点を示し、実使用
するには問題があった。For example, in recent years, impact-resistant polystyrene has come to be used in various containers. When the above-mentioned sealing material is used, some of them have low sealing strength,
Some of them showed a sufficient value as the initial seal strength, but showed a defect that the seal strength decreased with time, and there was a problem in practical use.
【０００４】[0004]
【発明が解決しようとする課題】そこで本発明者らは、
耐衝撃性ポリスチレンに対し充分な密閉性と易開封性を
示し、経時的にシール強度の低下傾向の少ないシール材
料を見いだすべく検討を行った。その結果、適度なシー
ル強度を示し、かつ経時的にシール強度変化の少ないシ
ール材料を見いだすに至った。このシール材料はまた組
成を変化させることによって、広くシール強度を調整し
うることも見いだすに至った。Therefore, the present inventors have found that
An investigation was conducted to find a sealing material that exhibits sufficient sealing property and easy-opening property with respect to impact-resistant polystyrene, and has a small tendency for the sealing strength to decrease with time. As a result, they have found a sealing material that exhibits an appropriate sealing strength and has little change in sealing strength over time. It has also been found that this seal material can widely adjust the seal strength by changing the composition.
【０００５】したがって本発明の目的は、易開封性シー
ル材料としては好適な新規なエチレン共重合体組成物を
提供するにある。本発明の他の目的は、易開封性シール
材料、とくに耐衝撃性ポリスチレン用に好適な易開封性
シール材料を提供するにある。さらに本発明の別の目的
は、このような易開封性シール材料を基材に塗布してな
る蓋材を提供するにある。Therefore, it is an object of the present invention to provide a novel ethylene copolymer composition suitable as an easy-open seal material. Another object of the present invention is to provide an easily openable seal material, especially an easily openable seal material suitable for impact-resistant polystyrene. Still another object of the present invention is to provide a lid member obtained by applying such an easy-open sealing material to a base material.
【０００６】[0006]
【課題を解決するための手段】本発明は、エチレン・不
飽和エステル共重合体８０〜９５重量部及び水素添加ス
チレン・ブタジエンゴム２０〜５重量部からなるエチレ
ン共重合体組成物に関する。本発明はまた、エチレン・
不飽和エステル共重合体３０〜９５重量部、水素添加ス
チレン・ブタジエンゴム２０〜３重量部、低結晶性エチ
レン・α−オレフィン共重合体０〜４０重量部及び粘着
付与樹脂０〜３０重量部とからなるエチレン共重合体組
成物に関する。本発明はまた、上記エチレン共重合体組
成物からなる易開封性シール材料に関する。本発明はま
た、基材にこのような易開封性シール材料が積層されて
なる蓋材等の包装材料に関する。The present invention relates to an ethylene copolymer composition comprising 80 to 95 parts by weight of an ethylene / unsaturated ester copolymer and 20 to 5 parts by weight of hydrogenated styrene / butadiene rubber. The present invention also relates to ethylene
Unsaturated ester copolymer 30 to 95 parts by weight, hydrogenated styrene / butadiene rubber 20 to 3 parts by weight, low crystalline ethylene / α-olefin copolymer 0 to 40 parts by weight and tackifying resin 0 to 30 parts by weight. And an ethylene copolymer composition comprising The present invention also relates to an easily openable seal material comprising the above ethylene copolymer composition. The present invention also relates to a packaging material such as a lid material formed by laminating such an easily-openable sealing material on a base material.
【０００７】以下、本発明につき、詳細に説明する。本
発明のエチレン共重合体組成物は、エチレン・不飽和エ
ステル共重合体と水素添加スチレン・ブタジエンゴムを
必須成分として構成される。The present invention will be described in detail below. The ethylene copolymer composition of the present invention comprises an ethylene / unsaturated ester copolymer and hydrogenated styrene / butadiene rubber as essential components.
【０００８】エチレン・不飽和エステル共重合体におけ
る不飽和エステルとしては、酢酸ビニル、プロピオン酸
ビニルのようなビニルエステル、アクリル酸メチル、ア
クリル酸エチル、アクリル酸イソブチル、アクリル酸ｎ
ブチル、アクリル酸イソオクチル、メタクリル酸メチ
ル、メタクリル酸イソブチルのような不飽和カルボン酸
エステル、とくに（メタ）アクリル酸エステルなどを例
示することができる。これらのなかでは酢酸ビニルや
（メタ）アクリル酸エステルの使用が望ましい。The unsaturated ester in the ethylene / unsaturated ester copolymer includes vinyl acetate, vinyl ester such as vinyl propionate, methyl acrylate, ethyl acrylate, isobutyl acrylate, and acrylic acid n.
Examples thereof include unsaturated carboxylic acid esters such as butyl, isooctyl acrylate, methyl methacrylate and isobutyl methacrylate, and particularly (meth) acrylic acid ester. Among these, vinyl acetate and (meth) acrylic acid ester are preferably used.
【０００９】上記共重合体における不飽和エステル含有
量としては、３〜２５重量％、とくに５〜２０重量％で
ある。この不飽和エステル含有量によっても耐衝撃性ポ
リスチレンに対するシール強度を調整することが可能で
あり、一般にその含有量が多くなる程シール強度やシー
ル強度の安定性は増加するが、その量があまり多くなり
すぎるとべたつきを生じ、とくに食品用途などではヘプ
タン抽出成分が多くなるなどの悪影響が生ずるので好ん
で用いるべきではない。またその含有量が少なすぎた
り、あるいはこの共重合体の代わりにポリエチレンを用
いたりした場合には、耐衝撃性ポリスチレンに対するシ
ール強度が小さく、またシールの安定性も低下するので
好ましくない。The unsaturated ester content in the above copolymer is 3 to 25% by weight, particularly 5 to 20% by weight. It is possible to adjust the seal strength for impact-resistant polystyrene also by the content of this unsaturated ester. Generally, the higher the content, the higher the seal strength and the stability of the seal strength, but the amount is too large. If it becomes too much, stickiness will occur, and adverse effects such as an increase in the amount of heptane extractive components will occur, especially in food applications, so it should not be used favorably. Further, if the content is too small, or if polyethylene is used instead of this copolymer, the sealing strength against impact-resistant polystyrene is low and the stability of the seal is also reduced, which is not preferable.
【００１０】エチレン・不飽和エステル共重合体として
はまた、加工性、シール強度等を勘案すると、１９０
℃、２１６０ｇ荷重におけるメルトフローレートが０．
１〜５００ｇ／１０分、とくに１〜１５０ｇ／１０分の
ものを使用するのがよい。The ethylene / unsaturated ester copolymer has a workability of 190 and a seal strength of 190.
The melt flow rate under a load of 2160 g is 0.
1 to 500 g / 10 minutes, especially 1 to 150 g / 10 minutes is preferably used.
【００１１】かかるエチレン共重合体は、高温、高圧下
のラジカル共重合によって得ることができ、その製造方
法は広く知られており、また多くの種類の共重合体が市
場で入手することができる。Such ethylene copolymers can be obtained by radical copolymerization under high temperature and high pressure, the production method thereof is widely known, and many kinds of copolymers are commercially available. .
【００１２】本発明においては、上記共重合体とともに
水素添加スチレン・ブタジエンゴムが使用される。水素
添加スチレン・ブタジエンゴムのベースポリマーとなる
スチレン・ブタジエンゴムとしては、スチレンとブタジ
エンのランダム共重合体、またはスチレンとブタジエン
のランダム共重合体のブロックを含み、これに任意に少
量のポリブタジエンブロック及び又はポリスチレンブロ
ックを含むブロック共重合体が好ましい。そしてスチレ
ンの重合割合が５〜５０重量％、とくに１０〜４０重量
％、ブタジエン重合単位におけるビニル結合が２０〜８
０％、好ましくは３０〜６０％のものが好ましい。そし
てこのようなスチレン・ブタジエンゴムのブタジエン重
合単位の水素添加率が８０％以上、好ましくは９０％以
上の水素添加品を用いるのが好ましい。このような水素
添加スチレン・ブタジエンゴムとして、数平均分子量が
３００００〜８０００００程度のものが好ましく、例え
ばダイナロン１３２０Ｐやダイナロン１９１０Ｐ（いず
れも日本合成ゴム（株）社製）として市場から入手する
ことができる。In the present invention, hydrogenated styrene-butadiene rubber is used together with the above copolymer. The styrene-butadiene rubber which is the base polymer of hydrogenated styrene-butadiene rubber includes a random copolymer of styrene and butadiene, or a block of a random copolymer of styrene and butadiene, in which a small amount of polybutadiene block and Alternatively, a block copolymer containing polystyrene blocks is preferable. The polymerization ratio of styrene is 5 to 50% by weight, especially 10 to 40% by weight, and the vinyl bond in the butadiene polymerization unit is 20 to 8%.
0%, preferably 30 to 60% is preferable. It is preferable to use a hydrogenated product in which the hydrogenation rate of butadiene polymer units of such styrene-butadiene rubber is 80% or more, preferably 90% or more. As such hydrogenated styrene-butadiene rubber, those having a number average molecular weight of about 30,000 to 800,000 are preferable, and for example, Dynaron 1320P and Dynaron 1910P (both manufactured by Japan Synthetic Rubber Co., Ltd.) can be obtained from the market. .
【００１３】エチレン・不飽和エステル共重合体と水素
添加スチレン・ブタジエンゴムからなる系においては、
その配合割合は、前者８０〜９５重量部、好ましくは８
３〜９３重量部に対し、後者２０〜５重量部、好ましく
は１７〜７重量部である。水素添加スチレン・ブタジエ
ンゴムは、耐衝撃性ポリスチレンへのシール性の改良、
とりわけシール強度の安定性の付与に効果的であるが、
その配合割合が多くなりすぎると、シール強度が過度に
大きくなったり、あるいはヘプタン抽出分が多くなりす
ぎて油性食品に使用できないなどの欠点が生ずる。In a system comprising an ethylene / unsaturated ester copolymer and hydrogenated styrene / butadiene rubber,
The proportion of the former is 80 to 95 parts by weight, preferably 8
The latter is 20 to 5 parts by weight, preferably 17 to 7 parts by weight, relative to 3 to 93 parts by weight. Hydrogenated styrene-butadiene rubber is an improved sealant for impact-resistant polystyrene,
Above all, it is effective in imparting stability of seal strength,
If the mixing ratio is too large, the sealing strength will be excessively large, or the heptane extract content will be too large to be used in oily foods.
【００１４】本発明においては、上記のようにエチレン
・不飽和エステル共重合体と水素添加スチレン・ブタジ
エンゴムのみの系でも使用可能であるが、ヒートシール
強度の温度依存性が若干大きく、またシール強度の微調
整が必ずしも容易でないので、低結晶性エチレン・α−
オレフィン共重合体及び又は粘着付与樹脂を併用するこ
とが望ましい。In the present invention, as described above, a system comprising only an ethylene / unsaturated ester copolymer and hydrogenated styrene / butadiene rubber can be used, but the heat seal strength has a slightly large temperature dependency, and the seal is also large. Fine adjustment of strength is not always easy, so low crystalline ethylene / α-
It is desirable to use an olefin copolymer and / or a tackifying resin together.
【００１５】この目的に使用できるエチレン・α−オレ
フィン共重合体は、Ｘ線に基づく結晶化度が、通常１〜
２０％、好ましくは３〜１５％の低結晶性共重合体であ
る。すなわち完全非晶質の共重合体を用いると、耐油性
が低下するので好ましくない。このような共重合体は、
例えばバナジウム化合物、ジルコニウム化合物のような
遷移金属化合物と有機アルミニウム化合物の組み合わせ
触媒の存在下、エチレンとα−オレフィンをランダム共
重合する事によって得ることができる。α−オレフィン
としては、プロピレン、１−ブテン、１−ペンテン、１
−ヘキセン、１−オクテン、４−メチル−１−ペンテン
などを例示することができる。これらの中では、炭素数
４以上のα−オレフィン、とりわけ１−ブテンの使用が
望ましい。使用する触媒系やα−オレフィンの種類によ
っても若干異なるが、上記結晶化度を有する共重合体と
するには、通常、α−オレフィンが７〜２０モル％、と
くに８〜１６モル％程度の割合が重合するようにすれば
よい。該共重合体としては、１９０℃、２１６０ｇ荷重
におけるメルトフローレートが０．１〜５００ｇ／１０
分、とくに１〜１５０ｇ／１０分のものを使用するのが
好ましい。The ethylene / α-olefin copolymer which can be used for this purpose usually has an X-ray crystallinity of 1 to
It is a low crystallinity copolymer of 20%, preferably 3 to 15%. That is, it is not preferable to use a completely amorphous copolymer because the oil resistance is lowered. Such a copolymer is
For example, it can be obtained by randomly copolymerizing ethylene and α-olefin in the presence of a combination catalyst of a transition metal compound such as a vanadium compound or a zirconium compound and an organic aluminum compound. As α-olefins, propylene, 1-butene, 1-pentene, 1
-Hexene, 1-octene, 4-methyl-1-pentene and the like can be exemplified. Among these, it is desirable to use an α-olefin having 4 or more carbon atoms, especially 1-butene. Although it varies slightly depending on the catalyst system used and the type of α-olefin, in order to obtain a copolymer having the above crystallinity, the amount of α-olefin is usually 7 to 20 mol%, particularly about 8 to 16 mol%. The ratio may be polymerized. The copolymer has a melt flow rate at 190 ° C. and a load of 2160 g of 0.1 to 500 g / 10.
It is preferable to use those having a minute content, particularly from 1 to 150 g / 10 minutes.
【００１６】本発明において使用することのできる粘着
付与樹脂としては、脂肪族炭化水素樹脂、脂肪族系炭化
水素樹脂、芳香族系炭化水素樹脂、ポリテルペン系樹
脂、ロジン類、スチレン系樹脂などの通常のホットメル
ト接着剤分野で使用されているものである。より具体的
には、脂肪族系炭化水素樹脂としては、炭素数４〜５の
オレフィンやジエンなどを主成分とする重合体を挙げる
ことができる。脂環族系炭化水素樹脂としては、スペン
トＣ4 やＣ5 留分のジエン成分を環化２量化後重合させ
て得られる樹脂、シクロペンタジエンなどの環状モノマ
ーを重合させて得た樹脂あるいはその水素添加物、芳香
族炭化水素樹脂を核内水素添加した樹脂などを挙げるこ
とができる。芳香族炭化水素樹脂としては、ビニルトル
エン、α−メチルスチレン、イソプロペニルトルエン、
インデンなどのＣ8 〜Ｃ10の不飽和芳香族炭化水素を主
成分とする樹脂を例示することができる。またポリテル
ペン樹脂としては、α−ピネン、β−ピネン、ジペンテ
ンなどの重合体、テルペン・フェノール樹脂、あるいは
水添テルペン樹脂などを例示することができる。ロジン
類の例としては、ロジン、重合ロジン、水添ロジン、ロ
ジンエステルあるいはその水添物または重合物などであ
る。またスチレン系樹脂はスチレン、ビニルトルエン、
α−メチルスチレン、イソプロペニルトルエンなどの重
合体またはこれらの相互共重合体などの低分子重合体な
どである。色調、臭気、食品衛生性等を重視する場合に
は、水素添加芳香族炭化水素樹脂や水素化ポリテルペン
樹脂を用いるのがよい。The tackifying resin which can be used in the present invention is usually an aliphatic hydrocarbon resin, an aliphatic hydrocarbon resin, an aromatic hydrocarbon resin, a polyterpene resin, a rosin or a styrene resin. Used in the field of hot melt adhesives. More specifically, examples of the aliphatic hydrocarbon resin include a polymer containing an olefin having 4 to 5 carbon atoms or a diene as a main component. As the alicyclic hydrocarbon resin, a resin obtained by polymerizing a diene component of spent C 4 or C 5 fraction after cyclization dimerization and polymerization, a resin obtained by polymerizing a cyclic monomer such as cyclopentadiene, or hydrogen thereof Examples thereof include additives and resins obtained by nuclear hydrogenation of aromatic hydrocarbon resins. As the aromatic hydrocarbon resin, vinyltoluene, α-methylstyrene, isopropenyltoluene,
The unsaturated aromatic hydrocarbon of C 8 -C 10, such as indene can be exemplified a resin as a main component. Examples of the polyterpene resin include polymers such as α-pinene, β-pinene and dipentene, terpene / phenol resin, hydrogenated terpene resin and the like. Examples of rosins include rosins, polymerized rosins, hydrogenated rosins, rosin esters, hydrogenated products or polymers thereof. In addition, styrene resin is styrene, vinyltoluene,
Examples thereof include polymers such as α-methylstyrene and isopropenyltoluene, and low molecular weight polymers such as mutual copolymers thereof. When importance is attached to color tone, odor, food hygiene, etc., hydrogenated aromatic hydrocarbon resin or hydrogenated polyterpene resin is preferably used.
【００１７】本発明において低結晶性エチレン・α−オ
レフィン共重合体及び／又は粘着付与樹脂を配合する場
合には、合計を１００重量部としたとき、エチレン・不
飽和エステル共重合体を３０〜９５重量部、好ましくは
３５〜９０重量部、水素添加スチレン・ブタジエンゴム
を２０〜３重量部、好ましくは１５〜５重量部、低結晶
性エチレン・α−オレフィン共重合体を０〜４０重量
部、好ましくは５〜３５重量部、粘着付与樹脂を０〜３
０重量部、好ましくは５〜２０重量部の割合で配合する
のがよい。そして水素添加スチレン・ブタジエンゴムと
粘着付与樹脂の合計量が、５〜３５重量部、とくに１０
〜３５重量部の範囲となるように調節するのが、ヒート
シール強度及びその安定性、耐油性を考慮すると好まし
い。When the low crystalline ethylene / α-olefin copolymer and / or the tackifying resin are blended in the present invention, the amount of the ethylene / unsaturated ester copolymer is 30 to 30 parts by weight when the total amount is 100 parts by weight. 95 parts by weight, preferably 35 to 90 parts by weight, 20 to 3 parts by weight of hydrogenated styrene / butadiene rubber, preferably 15 to 5 parts by weight, and 0 to 40 parts by weight of low crystalline ethylene / α-olefin copolymer. , Preferably 5 to 35 parts by weight, and the tackifying resin is 0 to 3
It is good to mix in an amount of 0 parts by weight, preferably 5 to 20 parts by weight. The total amount of hydrogenated styrene-butadiene rubber and tackifying resin is 5 to 35 parts by weight, especially 10
It is preferable to adjust the amount to be in the range of from 35 to 35 parts by weight in consideration of the heat seal strength, its stability and oil resistance.
【００１８】低結晶性エチレン・α−オレフィン共重合
体の添加は、一般に耐油性を損なわずに耐衝撃性ポリス
チレンへのシール性の改善に寄与するが、多くの場合、
過度に使用すると、本発明の組成物を基材に押出コーテ
ィングする際の加工性を損なうことがあるので、あまり
多量に配合するべきではない。また粘着付与樹脂の配合
も、耐衝撃性ポリスチレンへのシール性の改良に効果が
あるが、過度に配合すると耐油性や加工性を損なうた
め、適度の配合量に調節することが望まれる。Although the addition of the low crystalline ethylene / α-olefin copolymer generally contributes to the improvement of the sealing property to the high impact polystyrene without impairing the oil resistance, in many cases,
When used in excess, it may impair the processability in extrusion coating the composition of the present invention onto a substrate, and therefore should not be incorporated in a large amount. The addition of a tackifying resin is also effective in improving the sealing property to impact-resistant polystyrene, but if it is excessively added, the oil resistance and processability are impaired, so it is desirable to adjust the content to a suitable level.
【００１９】前記した本発明の組成物には、シール強度
等の調節のために少量であれば他の熱可塑性樹脂、例え
ばポリエチレンを配合してもよい。また周囲の各種添加
剤を任意量で配合してもよい。かかる添加剤の代表例と
しては、例えば押出加工性の改善、ブロッキング防止、
フィルムの滑り性改善などの目的で使用される添加剤を
挙げることができる。より具体的には、パルミチン酸ア
ミド、ステアリン酸アミド、ベヘニン酸アミド、オレイ
ン酸アミド、エルカ酸アミド、オレイルパルミドアミ
ド、ステアリルパルミドアミド、メチレンビスステアリ
ルアミド、エチレンビスエルカ酸アミドなどの各種アミ
ド類、ポリエチレングリコール、ポリプロピレングリコ
ールなどのポリアルキレングリコール、水添ひまし油、
シリカ、タルクなどの無機質添加剤などである。これら
の配合量は、無機質添加剤の場合は０．１〜３重量％程
度、それ以外のものは０．０１〜１重量％程度の範囲が
適当である。任意に配合しうる他の添加剤としては、酸
化防止剤、熱安定剤、光安定剤、帯電防止剤、顔料、染
料などを例示することができる。The composition of the present invention may be blended with another thermoplastic resin, for example polyethylene, in a small amount in order to adjust the sealing strength and the like. Also, various additives around may be blended in arbitrary amounts. Typical examples of such additives include, for example, improvement of extrusion processability, prevention of blocking,
Examples thereof include additives used for the purpose of improving the slipperiness of the film. More specifically, palmitic acid amide, stearic acid amide, behenic acid amide, oleic acid amide, erucic acid amide, oleyl palmidamide, stearyl palmidamide, methylenebisstearylamide, various amides such as ethylenebiserucic acid amide, Polyalkylene glycol such as polyethylene glycol and polypropylene glycol, hydrogenated castor oil,
Inorganic additives such as silica and talc. Appropriately, the blending amount of these is in the range of about 0.1 to 3% by weight in the case of an inorganic additive, and in the range of about 0.01 to 1% by weight for the other additives. Examples of other additives that can be optionally blended include antioxidants, heat stabilizers, light stabilizers, antistatic agents, pigments and dyes.
【００２０】本発明の組成物の調製は、前記各成分を同
時に又は逐次的に混合することによって行われる。混合
方法としては、単軸押出機、二軸押出機、バンパリーミ
キサー、各種ニーダーなどを用いて溶融混合する方法が
好ましく、その混合順序にはとくに制限はない。The composition of the present invention is prepared by mixing the above-mentioned components simultaneously or sequentially. As a mixing method, a method of melt mixing using a single-screw extruder, a twin-screw extruder, a bumper mixer, various kneaders and the like is preferable, and the mixing order is not particularly limited.
【００２１】かくして得られるエチレン共重合体組成物
は、押出加工性を考慮すると、１９０℃、２１６０ｇ荷
重におけるメルトフローレートが、１〜１５０ｇ／１０
分程度に調節されていることが望ましい。The ethylene copolymer composition thus obtained has a melt flow rate of 1 to 150 g / 10 at 190 ° C. under a load of 2160 g in consideration of extrusion processability.
It is desirable that it is adjusted to about a minute.
【００２２】本発明のエチレン共重合体組成物は易開封
性シール材として有効である。易開封性シール材として
使用する際、多くの場合、基材に積層した形で用いられ
る。基材としては、紙、アルミニウム、ポリエステル、
ポリエチレン、ポリプロピレン、アルミ蒸着ポリエステ
ル、シリカ蒸着ポリエステルなど種々のものが利用でき
る。基材は単層である必要はなく、２種以上の積層体で
あってもよい。本発明のエチレン共重合体組成物を基材
に積層するには、該組成物から予めキャスト法やインフ
レーション法でフィルムを作り、ドライラミネーション
法により基材と貼り合せる方法、該組成物を直接基材上
に押出コーティングする方法、ポリエチレン等を接着層
として用い、基材上にサンドイッチラミネーションによ
り接着層を介して積層する方法、基材と該組成物を共押
出する方法などは採用することができる。The ethylene copolymer composition of the present invention is effective as an easily openable sealant. When used as an easily openable sealant, it is often used in the form of being laminated on a substrate. As the base material, paper, aluminum, polyester,
Various materials such as polyethylene, polypropylene, aluminum vapor-deposited polyester, and silica vapor-deposited polyester can be used. The base material does not have to be a single layer, and may be a laminate of two or more kinds. To laminate the ethylene copolymer composition of the present invention on a substrate, a film is formed from the composition by a casting method or an inflation method in advance, and a method of laminating the composition to a substrate by a dry lamination method, the composition is directly bonded to the substrate. A method of extrusion coating on a material, a method of using polyethylene or the like as an adhesive layer, a method of laminating on a substrate via an adhesive layer by sandwich lamination, a method of co-extruding the substrate and the composition can be adopted. .
【００２３】かくして得られるエチレン共重合体組成物
をシール層とする積層体は包装材料として利用すること
ができる。とくに各種容器の蓋材として使用するときに
密封性、易開封性に優れた蓋材となる。適用可能な容器
として、ポリスチレン、耐衝撃性ポリスチレン、発泡ポ
リスチレン、ポリエチレン、ポリプロピレン、ポリエス
テル、ポリカーボネート、ポリ塩化ビニルなどの各種形
状の容器である。とくに耐衝撃性ポリスチレン容器に対
し優れた性能を示す蓋材となる。このような蓋付容器
は、例えばヨーグルト、プリン、みつ豆、サワー、豆
腐、ゼリー、乳酸飲料、和菓子、加工肉などの飲食物、
薬品、医療器具、トナーなどの各種包装に使用すること
ができる。The laminate having the ethylene copolymer composition thus obtained as a seal layer can be used as a packaging material. In particular, when used as a lid material for various containers, the lid material has excellent sealing property and easy opening property. Applicable containers are containers of various shapes such as polystyrene, impact-resistant polystyrene, expanded polystyrene, polyethylene, polypropylene, polyester, polycarbonate and polyvinyl chloride. In particular, it is a lid material that exhibits excellent performance for impact-resistant polystyrene containers. Such a container with a lid, for example, yogurt, pudding, bean beans, sour, tofu, jelly, lactic acid drink, Japanese confectionery, food and drink such as processed meat,
It can be used for various packaging such as medicines, medical instruments, and toner.
【００２４】[0024]
【実施例】以下に、本発明の効果を説明するために実施
例及び比較例を示す。なお、実施例、比較例において用
いた原料樹脂の組成、物性及び得られた積層材の物性評
価方法は以下の通りである。EXAMPLES Examples and comparative examples are shown below to explain the effects of the present invention. The composition and physical properties of the raw material resins used in Examples and Comparative Examples and the physical property evaluation methods of the obtained laminated materials are as follows.
【００２５】１．原料樹脂 （１）エチレン・酢酸ビニル共重合体 1. Raw material resin (1) Ethylene / vinyl acetate copolymer
【００２６】（２）水素添加スチレン・ブタジエンゴム
（ＤＹＮＡＲＯＮ １９１０Ｐ 日本合成ゴム（株）社
製）
ＭＦＲ５．３ｇ／１０分、密度０．９２ｇ／ｃｍ3 、ス
チレン含量３０ｗｔ％(2) Hydrogenated styrene-butadiene rubber (DYNARON 1910P manufactured by Nippon Synthetic Rubber Co., Ltd.) MFR 5.3 g / 10 minutes, density 0.92 g / cm 3 , styrene content 30 wt%
【００２７】（３）高圧法低密度ポリエチレン（ミラソ
ン Ｍ１０Ｐ 三井石油化学工業（株）製 ）
ＭＦＲ９．５ｇ／１０分、密度０．９１７ｇ／ｃｍ3 (3) High-pressure low-density polyethylene (Mirason M10P, manufactured by Mitsui Petrochemical Industries, Ltd.) MFR 9.5 g / 10 minutes, density 0.917 g / cm 3.
【００２８】（４）低結晶性エチレン・α−オレフィン
共重合体（タフマーＡ４０８５ 三井石油化学工業
（株）社製）
ＭＦＲ３．６ｇ／１０分(4) Low crystalline ethylene / α-olefin copolymer (Tufmer A4085 manufactured by Mitsui Petrochemical Industry Co., Ltd.) MFR 3.6 g / 10 minutes
【００２９】（５）粘着付与剤（アルコンＡＭ−１ 荒
川化学（株）製）
環球法軟化点１１５℃の脂環族炭化水素樹脂（芳香族系
炭化水素樹脂の核内水添樹脂）(5) Tackifier (Alcon AM-1 manufactured by Arakawa Chemical Co., Ltd.) Alicyclic hydrocarbon resin having a softening point of 115 ° C. by a ring and ball method (hydrogenated nuclear resin of aromatic hydrocarbon resin)
【００３０】２．積層材物性
（１）積層方法
組成物ペレットを、６５ｍｍ径の押出機によって、ダイ
出口温度２３０℃の条件でＴダイより溶融押出し、予め
作成されていた延伸ＰＥＴ（厚さ１２μｍ）／低密度ポ
リエチレンフィルム（厚さ２０μｍ）からなる２層構成
の可撓性材料のポリエチレンフィルム面に対して、加工
速度６０ｍ／分、コーティング厚さ３０μｍの条件で押
出コーティングを行って積層材を得た。2. Laminating Material Properties (1) Laminating Method The composition pellets are melt extruded from a T die under the conditions of a die exit temperature of 230 ° C. by an extruder having a diameter of 65 mm, and drawn PET (thickness 12 μm) / low-density polyethylene that is prepared in advance. Extrusion coating was performed on a polyethylene film surface of a flexible material having a two-layer structure made of a film (thickness 20 μm) under the conditions of a processing speed of 60 m / min and a coating thickness of 30 μm to obtain a laminated material.
【００３１】次に得られた積層材のヒートシール強度お
よびその経時変化を以下の方法により測定した。
（２）ヒートシール強度
ヒートシーラーを用いて、積層基材を、耐衝撃性ポリス
チレンの短冊状試料とヒートシールし、そのヒートシー
ル強度を測定した（ｇ／１５ｍｍ）。
ヒートシール条件
温度 １２０℃
１４０℃
１６０℃
時間 １ｓｅｃ
圧力 ２ｋｇ／ｃｍ2
測定は、ヒートシール後、２３℃×５０％ＲＨ条件にて
１日エージング後に行った。Next, the heat-sealing strength of the obtained laminated material and its change with time were measured by the following method. (2) Heat Seal Strength A laminated base material was heat-sealed with a strip-shaped sample of impact-resistant polystyrene using a heat sealer, and the heat-sealing strength was measured (g / 15 mm). Heat-sealing condition temperature 120 ° C. 140 ° C. 160 ° C. time 1 sec Pressure 2 kg / cm 2 The measurement was performed after heat-sealing and after aging for 1 day under the condition of 23 ° C. × 50% RH.
【００３２】（３）ヒートシール強度経時変化
上述のヒートシール条件にてシールしたサンプルを、２
３℃×５０％ＲＨ条件にて１４日間エージングした後、
ヒートシール強度測定を行った。(3) Change with time of heat sealing strength Samples sealed under the above heat sealing conditions were
After aging for 14 days at 3 ° C x 50% RH,
The heat seal strength was measured.
【００３３】［実施例１］ＥＶＡ９０．０重量部、水
素添加スチレン・ブタジエンゴム１０．０重量部、エル
カ酸アミド０．１重量部の混合物を単軸押出機にて、樹
脂温度１５０℃の条件下で溶融混合し組成物とした。こ
の組成物から前記方法により積層材を作成し、物性（ヒ
ートシール強度及びヒートシール強度経時変化）を測定
した。結果を表１に示す。Example 1 A mixture of EVA (90.0 parts by weight), hydrogenated styrene / butadiene rubber (10.0 parts by weight) and erucic acid amide (0.1 parts by weight) was mixed in a single screw extruder at a resin temperature of 150 ° C. The mixture was melt-mixed below to obtain a composition. A laminated material was prepared from this composition by the method described above, and the physical properties (heat seal strength and change with time of heat seal strength) were measured. The results are shown in Table 1.
【００３４】［実施例２］ＥＶＡ９０．０重量部、水
素添加スチレン・ブタジエンゴム１０．０重量部、エル
カ酸アミド０．３重量部の混合物を単軸押出機にて、樹
脂温度１５０℃の条件下で溶融混合し組成物とした。こ
の組成物から積層材を作成し、物性を前記方法により評
価した。結果を表１に示す。Example 2 A mixture of EVA (90.0 parts by weight), hydrogenated styrene / butadiene rubber (10.0 parts by weight) and erucic acid amide (0.3 parts by weight) was mixed in a single screw extruder at a resin temperature of 150 ° C. The mixture was melt-mixed below to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 1.
【００３５】［実施例３］ＥＶＡ９０．０重量部、水
素添加スチレン・ブタジエンゴム１０．０重量部、エル
カ酸アミド０．３重量部の混合物を単軸押出機にて、樹
脂温度１５０℃の条件下で溶融混合し組成物とした。こ
の組成物から積層材を作成し、物性を前記方法により評
価した。結果を表１に示す。Example 3 A mixture of EVA (90.0 parts by weight), hydrogenated styrene / butadiene rubber (10.0 parts by weight) and erucic acid amide (0.3 parts by weight) was mixed in a single screw extruder at a resin temperature of 150 ° C. The mixture was melt-mixed below to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 1.
【００３６】［実施例４］ＥＶＡ７０．０重量部、水
素添加スチレン・ブタジエンゴム１０．０重量部、低結
晶性エチレン・α−オレフィン共重合体２０．０重量
部、エルカ酸アミド０．１重量部の混合物を単軸押出機
にて、樹脂温度１５０℃の条件下で溶融混合し組成物と
した。この組成物から積層材を作成し、物性を前記方法
により評価した。結果を表１に示す。Example 4 EVA 70.0 parts by weight, hydrogenated styrene / butadiene rubber 10.0 parts by weight, low crystalline ethylene / α-olefin copolymer 20.0 parts by weight, erucic acid amide 0.1 part by weight A part of the mixture was melt-mixed with a single screw extruder under the condition of a resin temperature of 150 ° C. to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 1.
【００３７】［実施例５］ＥＶＡ７５．０重量部、水
素添加スチレン・ブタジエンゴム１０．０重量部、粘着
付与剤１５．０重量部、エルカ酸アミド０．１重量部の
混合物を単軸押出機にて、樹脂温度１５０℃の条件下で
溶融混合し組成物とした。この組成物から積層材を作成
し、物性を前記方法により評価した。結果を表１に示
す。Example 5 A mixture of EVA 75.0 parts by weight, hydrogenated styrene-butadiene rubber 10.0 parts by weight, tackifier 15.0 parts by weight and erucic acid amide 0.1 part by weight was added to a single screw extruder. In the above, a resin composition was melt-mixed at a resin temperature of 150 ° C. to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 1.
【００３８】［実施例６］ＥＶＡ７５．０重量部、水
素添加スチレン・ブタジエンゴム５．０重量部、粘着付
与剤２０．０重量部、エルカ酸アミド０．１重量部の混
合物を単軸押出機にて、樹脂温度１５０℃の条件下で溶
融混合し組成物とした。この組成物から積層材を作成
し、物性を前記方法により評価した。結果を表１に示
す。Example 6 A mixture of EVA 75.0 parts by weight, hydrogenated styrene-butadiene rubber 5.0 parts by weight, tackifier 20.0 parts by weight and erucic acid amide 0.1 part by weight was added to a single screw extruder. In the above, a resin composition was melt-mixed at a resin temperature of 150 ° C. to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 1.
【００３９】［実施例７］ＥＶＡ５５．０重量部、水
素添加スチレン・ブタジエンゴム１０．０重量部、低結
晶性エチレン・α−オレフィン共重合体２０．０重量
部、粘着付与剤１５．０重量部、エルカ酸アミド０．１
重量部の混合物を単軸押出機にて、樹脂温度１５０℃の
条件下で溶融混合し組成物とした。この組成物から積層
材を作成し、物性を前記方法により評価した。結果を表
１に示す。Example 7 EVA 55.0 parts by weight, hydrogenated styrene / butadiene rubber 10.0 parts by weight, low crystalline ethylene / α-olefin copolymer 20.0 parts by weight, tackifier 15.0 parts by weight. Part, erucic acid amide 0.1
A mixture of 1 part by weight was melt-mixed with a single screw extruder under the condition of a resin temperature of 150 ° C. to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 1.
【００４０】［実施例８］ＥＶＡ６５．０重量部、水
素添加スチレン・ブタジエンゴム１０．０重量部、低結
晶性エチレン・α−オレフィン共重合体１０．０重量
部、粘着付与剤１５．０重量部、エルカ酸アミド０．１
重量部の混合物を単軸押出機にて、樹脂温度１５０℃の
条件下で溶融混合し組成物とした。この組成物から積層
材を作成し、物性を前記方法により評価した。結果を表
１に示す。Example 8 65.0 parts by weight of EVA, 10.0 parts by weight of hydrogenated styrene / butadiene rubber, 10.0 parts by weight of low crystalline ethylene / α-olefin copolymer, 15.0 parts by weight of tackifier. Part, erucic acid amide 0.1
A mixture of 1 part by weight was melt-mixed with a single screw extruder under the condition of a resin temperature of 150 ° C. to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 1.
【００４１】［実施例９］ＥＶＡ７５．０重量部、水
素添加スチレン・ブタジエンゴム５．０重量部、粘着付
与剤２０．０重量部、エルカ酸アミド０．３重量部の混
合物を単軸押出機にて、樹脂温度１５０℃の条件下で溶
融混合し組成物とした。この組成物から積層材を作成
し、物性を前記方法により評価した。結果を表２に示
す。Example 9 A mixture of EVA 75.0 parts by weight, hydrogenated styrene-butadiene rubber 5.0 parts by weight, tackifier 20.0 parts by weight and erucic acid amide 0.3 parts by weight was added to a single screw extruder. In the above, a resin composition was melt-mixed at a resin temperature of 150 ° C. to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 2.
【００４２】［実施例１０］ＥＶＡ７０．０重量部、
水素添加スチレン・ブタジエンゴム１０．０重量部、低
結晶性エチレン・α−オレフィン共重合体１０．０重量
部、粘着付与剤１０．０重量部、エルカ酸アミド０．３
重量部の混合物を単軸押出機にて、樹脂温度１５０℃の
条件下で溶融混合し組成物とした。この組成物から積層
材を作成し、物性を前記方法により評価した。結果を表
２に示す。[Example 10] EVA 70.0 parts by weight,
Hydrogenated styrene / butadiene rubber 10.0 parts by weight, low crystalline ethylene / α-olefin copolymer 10.0 parts by weight, tackifier 10.0 parts by weight, erucic acid amide 0.3
A mixture of 1 part by weight was melt-mixed with a single screw extruder under the condition of a resin temperature of 150 ° C. to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 2.
【００４３】［実施例１１］ＥＶＡ８０．０重量部、
水素添加スチレン・ブタジエンゴム１０．０重量部、低
結晶性エチレン・α−オレフィン共重合体１０．０重量
部、エルカ酸アミド０．３重量部の混合物を単軸押出機
にて、樹脂温度１５０℃の条件下で溶融混合し組成物と
した。この組成物から積層材を作成し、物性を前記方法
により評価した。結果を表２に示す。Example 11 EVA 80.0 parts by weight,
A mixture of 10.0 parts by weight of hydrogenated styrene / butadiene rubber, 10.0 parts by weight of a low crystalline ethylene / α-olefin copolymer and 0.3 part by weight of erucic acid amide was mixed with a single screw extruder at a resin temperature of 150. The composition was melt-mixed under conditions of ° C. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 2.
【００４４】［実施例１２］ＥＶＡ７５．０重量部、
水素添加スチレン・ブタジエンゴム５．０重量部、粘着
付与剤２．０．重量部、エルカ酸アミド０．３重量部の
混合物を単軸押出機にて、樹脂温度１５０℃の条件下で
溶融混合し組成物とした。この組成物から積層材を作成
し、物性を前記方法により評価した。結果を表２に示
す。[Example 12] EVA 75.0 parts by weight,
Hydrogenated styrene-butadiene rubber 5.0 parts by weight, tackifier 2.0. A mixture of 1 part by weight and 0.3 part by weight of erucic acid amide was melt-mixed with a single screw extruder under the condition of a resin temperature of 150 ° C. to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 2.
【００４５】［実施例１３］ＥＶＡ７０．０重量部、
水素添加スチレン・ブタジエンゴム１０．０重量部、低
結晶性エチレン・α−オレフィン共重合体１０．０重量
部、粘着付与剤１０．０重量部、エルカ酸アミド０．３
重量部の混合物を単軸押出機にて、樹脂温度１５０℃の
条件下で溶融混合し組成物とした。この組成物から積層
材を作成し、物性を前記方法により評価した。結果を表
２に示す。[Example 13] EVA 70.0 parts by weight,
Hydrogenated styrene / butadiene rubber 10.0 parts by weight, low crystalline ethylene / α-olefin copolymer 10.0 parts by weight, tackifier 10.0 parts by weight, erucic acid amide 0.3
A mixture of 1 part by weight was melt-mixed with a single screw extruder under the condition of a resin temperature of 150 ° C. to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 2.
【００４６】［実施例１４］ＥＶＡ４０．０重量部、
水素添加スチレン・ブタジエンゴム１０．０重量部、低
結晶性エチレン・α−オレフィン共重合体３０．０重量
部、粘着付与剤２０．０重量部、エルカ酸アミド０．１
重量部の混合物を単軸押出機にて、樹脂温度１５０℃の
条件下で溶融混合し組成物とした。この組成物から積層
材を作成し、物性を前記方法により評価した。結果を表
２に示す。Example 14 EVA 40.0 parts by weight,
Hydrogenated styrene / butadiene rubber 10.0 parts by weight, low crystalline ethylene / α-olefin copolymer 30.0 parts by weight, tackifier 20.0 parts by weight, erucic acid amide 0.1
A mixture of 1 part by weight was melt-mixed with a single screw extruder under the condition of a resin temperature of 150 ° C. to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 2.
【００４７】［比較例１］実施例１において、ＥＶＡ
の代わりに高圧法低密度ポリエチレン９０．０重量部を
用いた以外は実施例１と同様にして樹脂組成物を調製
し、この組成物から積層材を作成し、物性を前記方法に
より評価した。結果を表２に示す。[Comparative Example 1] EVA in Example 1
A resin composition was prepared in the same manner as in Example 1 except that 90.0 parts by weight of high-pressure low-density polyethylene was used instead of, and a laminate was prepared from this composition, and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 2.
【００４８】［比較例２］水素添加スチレン・ブタジエ
ンゴムを添加せず、ＥＶＡ８０．０重量部、粘着付与
剤２０．０重量部、エルカ酸アミド０．３重量部のみの
混合物を単軸押出機にて、樹脂温度１５０℃の条件下で
溶融混合し組成物とした。この組成物から積層材を作成
し、物性を前記方法により評価した。結果を表２に示
す。[Comparative Example 2] A single-screw extruder was prepared by adding a mixture of 80.0 parts by weight of EVA, 20.0 parts by weight of tackifier and 0.3 part by weight of erucic acid amide without adding hydrogenated styrene-butadiene rubber. In the above, a resin composition was melt-mixed at a resin temperature of 150 ° C. to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 2.
【００４９】［比較例３］水素添加スチレン・ブタジエ
ンゴムを添加せず、ＥＶＡ４０．０重量部、低結晶性
エチレン・α−オレフィン共重合体４０．０重量部、粘
着付与剤２０．０重量部、エルカ酸アミド０．１重量部
の混合物を単軸押出機にて、樹脂温度１５０℃の条件下
で溶融混合し組成物とした。この組成物から積層材を作
成し、物性を前記方法により評価した。結果を表２に示
す。Comparative Example 3 40.0 parts by weight of EVA, 40.0 parts by weight of low crystalline ethylene / α-olefin copolymer, 20.0 parts by weight of tackifier without adding hydrogenated styrene / butadiene rubber. A mixture of 0.1 part by weight of erucic acid amide was melt-mixed with a single-screw extruder at a resin temperature of 150 ° C. to obtain a composition. A laminated material was prepared from this composition and the physical properties were evaluated by the above-mentioned methods. The results are shown in Table 2.
【００５０】[0050]
【表１】 [Table 1]
【００５１】[0051]
【表２】 [Table 2]
【００５２】[0052]
【発明の効果】本発明はエチレン・不飽和エステル共重
合体と水素添加スチレン・ブタジエンゴムを必須成分と
し、更に低結晶性エチレン・α−オレフィン共重合体及
び粘着付与樹脂を適宜配合した組成物としたことによ
り、適度なシール強度で、しかもシール強度の経時的変
化の少ないシール材料が得られ、また上記各成分の組成
を変化させることによって、シール強度を調整しうるの
で、易開封性シール材料として好適であり、とくに耐衝
撃性ポリスチレン用に好適な易開封性シール材料が得ら
れる。またこれを基材に積層することにより易開封性の
容器蓋材として食品容器等に利用できる。EFFECTS OF THE INVENTION The present invention is a composition in which an ethylene / unsaturated ester copolymer and hydrogenated styrene / butadiene rubber are essential components, and a low crystallinity ethylene / α-olefin copolymer and a tackifying resin are appropriately blended. As a result, a seal material having an appropriate seal strength and a small change in the seal strength over time can be obtained, and the seal strength can be adjusted by changing the composition of each of the above components. An easily openable sealing material suitable as a material, particularly for impact-resistant polystyrene, can be obtained. Further, by laminating this on a base material, it can be used as an easily-openable container lid material for food containers and the like.
Claims (8)
〜９５重量部及び水素添加スチレン・ブタジエンゴム２
０〜５重量部からなるエチレン共重合体組成物。1. An ethylene / unsaturated ester copolymer 80
~ 95 parts by weight and hydrogenated styrene-butadiene rubber 2
An ethylene copolymer composition comprising 0 to 5 parts by weight.
〜９５重量部及び水素添加スチレン・ブタジエンゴム２
０〜３重量部、低結晶性エチレン・α−オレフィン共重
合体０〜４０重量部及び粘着付与樹脂０〜３０重量部と
からなるエチレン共重合体組成物。2. An ethylene / unsaturated ester copolymer 30.
~ 95 parts by weight and hydrogenated styrene-butadiene rubber 2
An ethylene copolymer composition comprising 0 to 3 parts by weight, a low crystalline ethylene / α-olefin copolymer 0 to 40 parts by weight, and a tackifying resin 0 to 30 parts by weight.
飽和エステル含有量が５〜２５重量％である請求項１又
は２記載のエチレン共重合体組成物。3. The ethylene copolymer composition according to claim 1, wherein the unsaturated ester content of the ethylene / unsaturated ester copolymer is 5 to 25% by weight.
スチレン含有量が５〜５０重量％、ブタジエン重合単位
におけるビニル結合の割合が２０〜８０重量％のスチレ
ン・ブタジエンゴムをブタジエン重合単位の８０％以上
を水素添加したものである請求項１又は２記載のエチレ
ン共重合体組成物。4. A hydrogenated styrene-butadiene rubber,
3. A styrene-butadiene rubber having a styrene content of 5 to 50% by weight and a vinyl bond ratio in the butadiene polymer unit of 20 to 80% by weight, wherein 80% or more of the butadiene polymer unit is hydrogenated. Ethylene copolymer composition.
合体の結晶化度が１〜２０％である請求項２記載のエチ
レン共重合体組成物。5. The ethylene copolymer composition according to claim 2, wherein the low crystalline ethylene / α-olefin copolymer has a crystallinity of 1 to 20%.
請求項２記載のエチレン共重合体組成物。6. The ethylene copolymer composition according to claim 2, wherein the tackifying resin is a hydrogenated petroleum resin.
ン共重合体組成物からなる易開封性シール材料。7. An easily openable sealing material comprising the ethylene copolymer composition according to claim 1.
料が積層されてなる包装材料。8. A packaging material comprising a base material and the easily openable sealing material according to claim 7 laminated on the base material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18524194A JP3460862B2 (en) | 1994-07-14 | 1994-07-14 | Ethylene copolymer composition and easy-open seal material using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18524194A JP3460862B2 (en) | 1994-07-14 | 1994-07-14 | Ethylene copolymer composition and easy-open seal material using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0826340A JPH0826340A (en) | 1996-01-30 |
| JP3460862B2 true JP3460862B2 (en) | 2003-10-27 |
Family
ID=16167364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18524194A Expired - Fee Related JP3460862B2 (en) | 1994-07-14 | 1994-07-14 | Ethylene copolymer composition and easy-open seal material using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3460862B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200347214A1 (en) * | 2018-01-22 | 2020-11-05 | Dow-Mitsui Polychemicals Co., Ltd. | Sealing resin composition, sealing material, packaging material, packaging container, and package |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002161145A (en) * | 2000-09-14 | 2002-06-04 | Denki Kagaku Kogyo Kk | Shrinkable film |
| JP4908675B2 (en) * | 2000-11-09 | 2012-04-04 | 三井・デュポンポリケミカル株式会社 | Polymer composition and easy-open sealing material using the same |
| CN101124279B (en) * | 2005-02-22 | 2011-09-07 | 三井-杜邦聚合化学株式会社 | Ethylene copolymer composition and easily breakable sealing material using same |
| KR102525720B1 (en) * | 2015-07-06 | 2023-04-25 | 미츠이·다우 폴리케미칼 가부시키가이샤 | Resin composition and use thereof |
| JPWO2019117217A1 (en) * | 2017-12-14 | 2020-12-03 | 株式会社ブリヂストン | Rubber composition and tires |
-
1994
- 1994-07-14 JP JP18524194A patent/JP3460862B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200347214A1 (en) * | 2018-01-22 | 2020-11-05 | Dow-Mitsui Polychemicals Co., Ltd. | Sealing resin composition, sealing material, packaging material, packaging container, and package |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0826340A (en) | 1996-01-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2166034B1 (en) | Olefin polymer compositions and easy-peelable sealants made by using the same | |
| US8076422B2 (en) | Coextrudable hot-melt adhesive | |
| JP3681488B2 (en) | Ethylene copolymer composition and easy-open sealing material using the same | |
| US5516583A (en) | Adhesive for tamper evident seals | |
| JP2002519474A (en) | Hot melt adhesive composition comprising homogeneous ethylene interpolymer and block copolymer | |
| EP1708933A1 (en) | Compositions of ethylene/vinyl acetate copolymers for heat-sealable easy opening packaging | |
| JPS631982B2 (en) | ||
| EP1344642A2 (en) | Sealant film, resin composition for sealant and uses of the film | |
| US5126176A (en) | Lidding for containers | |
| JP4400800B2 (en) | Resin composition and laminate thereof | |
| JP3386213B2 (en) | Resin composition and laminate thereof | |
| JP3460862B2 (en) | Ethylene copolymer composition and easy-open seal material using the same | |
| JP2005187744A (en) | Resin composition and laminate | |
| JP4908675B2 (en) | Polymer composition and easy-open sealing material using the same | |
| AU627108B2 (en) | Lidding for containers | |
| JP4147888B2 (en) | Ethylene copolymer composition and easy-open sealing material using the same | |
| JP4778283B2 (en) | Resin composition and laminate | |
| JP3599869B2 (en) | Ethylene copolymer composition and easy-open seal material using the same | |
| JP4326775B2 (en) | Ethylene copolymer composition and easy-open sealing material using the same | |
| JP6291766B2 (en) | Easy-open laminated film, easy-open laminated film and lid | |
| JP4438108B2 (en) | Ethylene polymer composition and easy-open sealing material using the same | |
| JPS6329894B2 (en) | ||
| JP7176822B2 (en) | Easy-peelable resin composition and sealing material comprising the same | |
| JPS643895B2 (en) | ||
| JPS6340820B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20030729 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070815 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080815 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080815 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090815 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090815 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100815 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110815 Year of fee payment: 8 |
|
| LAPS | Cancellation because of no payment of annual fees |