JP3568220B2 - Bag with zipper - Google Patents
Bag with zipper Download PDFInfo
- Publication number
- JP3568220B2 JP3568220B2 JP21778893A JP21778893A JP3568220B2 JP 3568220 B2 JP3568220 B2 JP 3568220B2 JP 21778893 A JP21778893 A JP 21778893A JP 21778893 A JP21778893 A JP 21778893A JP 3568220 B2 JP3568220 B2 JP 3568220B2
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- JP
- Japan
- Prior art keywords
- ethylene
- bag
- chuck
- copolymer
- carboxylic acid
- 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
- Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
- Bag Frames (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は、良好な咬合性、袋本体の柔軟性、チャック、本体の高周波ウエルド部分の優れた接着性を兼ね備えたチャック付き袋に関する。
【０００２】
【従来の技術及び発明が解決しようとする課題】
ポリ塩化ビニル製のチャック付き袋は、柔軟性に富み、また高周波ウエルド法により容易に接着できる等の多くの利点を持っている。高周波ウエルド法による接着は、熱板を用いるヒートシール法と異なり接着層の内部発熱を利用する接着法であり、ヒートシール法に比べ下記の長所を有している。
１）外層部の熱劣化が少ない。
２）温度上昇が迅速である。
３）温度の均一性が高い。
しかし、ポリ塩化ビニルは環境問題などで好ましくない。
【０００３】
そこでハロゲンを用いていないオレフィン系樹脂、例えばポリエチレン製の袋が注目を浴びてきている。しかし、ポリエチレンは極性に乏しく、高周波ウエルド法が適用できないという不都合を有する。
【０００４】
オレフィン系樹脂の極性をあげる方法としては、例えばエステル結合などを含有するコモノマーを共重合する方法があるが、コモノマー量を増やすと、剛性が大きく低下するため、剛性を必要とするチャック部で十分な咬合性を得ることができないという問題点を有する。
すなわち、極性をあげて高周波ウエルド性を向上させれば、オレフィン系樹脂は、剛性が大きく低下するため、高周波ウエルド性と剛性とは相反するという問題点を有する。
【０００５】
【課題を解決するための手段】
かかる事情に鑑み、本発明者らは、チャック部及び袋本体部の樹脂の適正及びポリ塩化ビニル製袋を製造する際に使用した高周波ウエルドの設備をそのまま利用することについて種々検討した結果、ノンハロゲン系のオレフィン系樹脂で、袋本体部の柔軟性、チャック部の良好な咬合性、高周波ウエルド時のチャック部、袋本体部の接着性等のバランスのとれた製品を見出し、さらに種々の検討を加えて本発明を完成させた。
【０００６】
すなわち、本発明は、袋本体部及びチャック部から構成されるチャック付き袋であり、袋本体部がエチレンとα ， β−不飽和カルボン酸アルキルエステルとの共重合体からなり、チャック部がエチレンとα，β−不飽和カルボン酸との共重合体の金属塩からなるチャック付き袋を提供するものである。
【０００７】
以下、本発明を詳細に説明する。
本発明のチャック付き袋は、袋本体部及びチャック部から構成されるものである。
袋本体部は、エチレンとα，β−不飽和カルボン酸アルキルエステルとの共重合体からなり、柔軟性に優れる。
α，β−不飽和カルボン酸アルキルエステルとしては、例えばアクリル酸メチル、アクリル酸エチル、アクリル酸ブチル、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸ブチル等が挙げられる。中でもアクリル酸メチル、メタクリル酸メチルが好ましい。
また、これらは混合してもよい。
【０００８】
また、エチレンとα，β−不飽和カルボン酸アルキルエステルとの共重合体としては、具体的にエチレンとアクリル酸メチルとの共重合体、エチレンとメタクリル酸メチルとの共重合体が好ましい。
【０００９】
上記エチレンとα，β−不飽和カルボン酸アルキルエステルとの共重合体は、好ましくはエチレン単位が６０〜９５重量％、α，β−不飽和カルボン酸アルキルエステル単位が４０〜５重量％であり、より好ましくはエチレン単位が７０〜９０重量％、α，β−不飽和カルボン酸アルキルエステル単位が３０〜１０重量％である。
【００１０】
チャック部は、エチレンとα，β−不飽和カルボン酸との共重合体の金属塩からなり、良好な咬合性を有する。
α，β−不飽和カルボン酸としては、例えばアクリル酸、メタクリル酸、ビニル酢酸、アリル酢酸等が挙げられ、好ましくはアクリル酸及びメタクリル酸である。
エチレンとα，β−不飽和カルボン酸との共重合体としては、例えばエチレンとアクリル酸との共重合体、エチレンとメタクリル酸との共重合体、エチレンとビニル酢酸との共重合体及び、エチレンとアリル酢酸との共重合体が挙げられ、中でもエチレンとアクリル酸との共重合体及び、エチレンとメタクリル酸との共重合体が好ましい。
また、中和する金属としては、例えばリチウム、ナトリウム、カリウム及び亜鉛等が挙げられ、中でもナトリウム及び亜鉛が好ましい。
チャック部としては、具体的にはエチレンとアクリル酸との共重合体、エチレンとメタクリル酸との共重合体、エチレンとビニル酢酸との共重合体及び、エチレンとアリル酢酸との共重合体の中から選ばれる少なくとも一種の共重合体と、リチウム、ナトリウム、カリウム及び亜鉛等の中から選ばれる少なくとも一種の金属からなり、中でもエチレンとアクリル酸との共重合体のナトリウム塩、エチレンとアクリル酸との共重合体の亜鉛塩、エチレンとメタクリル酸との共重合体のナトリウム塩、エチレンとメタクリル酸との共重合体の亜鉛塩が好ましい。
エチレンとα，β−不飽和カルボン酸との共重合体の金属塩の原料となるエチレンとα，β−不飽和カルボン酸との共重合体は、好ましくはエチレン単位が７０〜９８重量％、α，β−不飽和カルボン酸単位が３０〜２重量％であり、より好ましくはエチレン単位が８０〜９５重量％、α，β−不飽和カルボン酸単位が２０〜５重量％である。
上記共重合体の金属塩の中和度は、１０〜４０％の範囲が好ましい。
【００１１】
本発明のチャック付き袋の製造方法としては、特に限定されるものではないが、袋の原反フィルムはＴダイス加工、インフレーション加工またはカレンダー加工により製造できる。チャック部は、異形押出法により製造できる。
また、袋本体部及びチャック部は、高周波ウエルド法により接着するのが好ましい。この際、袋本体部及びチャック部は、同時または別個に接着することにより製造できる。
【００１２】
【発明の効果】
以上、詳述したように、本発明のチャック付き袋は袋本体部の柔軟性、チャック部の良好な咬合性、高周波ウエルド時のチャック部、袋本体部の良好な接着性を有するバランスのとれた優れた製品を提供できる。
【００１３】
【実施例】
以下、本発明を実施例によって説明するが、本発明はこれらに限定されるものではない。
次に実施例における物性値の測定方法は下記のとおりである。
（１）メルトフローレート（ＭＦＲ）
ＪＩＳ Ｋ６７６０に規定された方法に従った。
（２）エチレン含量
プレスシートを作成し、測定した赤外吸収スペクトルの１７００ｃｍ−１前後に現れるカルボニル（Ｃ＝Ｏ）の特性吸収の吸光度を厚みで補正して、検量線法によりエステルまたはカルボン酸含量を求め、これをもとに計算によってエチレン含量を求めた。
【００１４】
実施例１
袋本体部にエチレンとメタアクリル酸メチルとの共重合体（エチレン含量８０重量％、ＭＦＲ３；（ＥＭＭＡ））を用い、チャック部にエチレンとメタクリル酸との共重合体（エチレン含量８８重量％、メタクリル酸含量１２重量％）の亜鉛塩（中和度３０％）（ＩＯ）を用いて、高周波ウエルド法によりチャック付き袋を製造した。
高周波ウエルド性、チャック部の咬合性、袋本体部の柔軟性は、目視及び感触により評価し、その結果を表１に示す。
【００１５】
比較例１
チャック部に、実施例１の袋本体部で用いたＥＭＭＡと同じものを用いた以外は、実施例１と同様の方法でチャック付き袋を製造した。
評価結果を表１に示す。
【００１６】
比較例２
チャック部に、高圧法低密度ポリエチレン（ＬＤＰＥ）を用いた以外は、実施例１と同様の方法でチャック付き袋を製造した。
評価結果を表１に示す。
【００１７】
比較例３
袋本体部に、実施例１のチャック部で用いたＩＯと同じものを用いた以外は、実施例１と同様の方法でチャック付き袋を製造した。
評価結果を表１に示す。
【００１８】
【表１】
[Industrial applications]
The present invention relates to a zipper-equipped bag having good occlusal properties, flexibility of the bag main body, chuck, and excellent adhesiveness of a high-frequency weld portion of the main body.
[0002]
Problems to be solved by the prior art and the invention
A bag with a chuck made of polyvinyl chloride has many advantages such as high flexibility and easy adhesion by a high frequency welding method. Adhesion by the high frequency welding method is an adhesion method that utilizes the internal heat generation of the adhesive layer, unlike the heat sealing method using a hot plate, and has the following advantages over the heat sealing method.
1) Thermal degradation of the outer layer is small.
2) The temperature rises quickly.
3) High temperature uniformity.
However, polyvinyl chloride is not preferable due to environmental problems.
[0003]
Therefore, olefin-based resins that do not use halogen, for example, polyethylene bags, have been receiving attention. However, polyethylene has a disadvantage that the polarity is poor and the high frequency welding method cannot be applied.
[0004]
As a method of increasing the polarity of the olefin-based resin, for example, there is a method of copolymerizing a comonomer containing an ester bond or the like.However, when the amount of the comonomer is increased, the rigidity is greatly reduced. There is a problem that it is not possible to obtain a proper occlusal property.
In other words, if the high frequency weldability is improved by increasing the polarity, the rigidity of the olefin-based resin is greatly reduced, so that there is a problem that the high frequency weldability is inconsistent with the rigidity.
[0005]
[Means for Solving the Problems]
In view of such circumstances, the present inventors have conducted various studies on the appropriateness of the resin for the chuck portion and the bag main body portion and the use of the high-frequency weld equipment used in manufacturing the polyvinyl chloride bag as it is, and as a result, a non-halogen-free product was obtained. Of olefin-based resin with good balance of flexibility of bag body, good occlusality of chuck part, adhesiveness of chuck part and bag body part during high frequency welding, etc. In addition, the present invention has been completed.
[0006]
That is, the present invention relates to a bag with a chuck comprising a bag body and a chuck, wherein the bag body is made of a copolymer of ethylene and an α , β-unsaturated carboxylic acid alkyl ester, and the chuck is made of ethylene. The present invention provides a bag with a chuck made of a metal salt of a copolymer of α and β, unsaturated carboxylic acid.
[0007]
Hereinafter, the present invention will be described in detail.
The bag with a zipper of the present invention comprises a bag body and a zipper.
The bag body is made of a copolymer of ethylene and an α, β-unsaturated carboxylic acid alkyl ester, and has excellent flexibility.
Examples of the α, β-unsaturated carboxylic acid alkyl ester include methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate and the like. Among them, methyl acrylate and methyl methacrylate are preferred.
These may be mixed.
[0008]
Further, as a copolymer of ethylene and an α, β-unsaturated carboxylic acid alkyl ester , specifically, a copolymer of ethylene and methyl acrylate, and a copolymer of ethylene and methyl methacrylate are preferred.
[0009]
The copolymer of ethylene and the α, β-unsaturated carboxylic acid alkyl ester preferably has 60 to 95% by weight of ethylene units and 40 to 5% by weight of α, β-unsaturated carboxylic acid alkyl ester units. More preferably, the ethylene unit is 70 to 90% by weight, and the α, β-unsaturated carboxylic acid alkyl ester unit is 30 to 10% by weight.
[0010]
The chuck portion is made of a metal salt of a copolymer of ethylene and α, β-unsaturated carboxylic acid, and has good occlusal properties.
Examples of the α, β-unsaturated carboxylic acid include acrylic acid, methacrylic acid, vinyl acetic acid, allyl acetic acid and the like, and preferred are acrylic acid and methacrylic acid.
Examples of the copolymer of ethylene and α, β-unsaturated carboxylic acid include a copolymer of ethylene and acrylic acid, a copolymer of ethylene and methacrylic acid, a copolymer of ethylene and vinyl acetic acid, Copolymers of ethylene and allyl acetic acid are exemplified, and among them, a copolymer of ethylene and acrylic acid and a copolymer of ethylene and methacrylic acid are preferable.
Examples of the metal to be neutralized include lithium, sodium, potassium, and zinc, and among them, sodium and zinc are preferable.
As the chuck portion, specifically, a copolymer of ethylene and acrylic acid, a copolymer of ethylene and methacrylic acid, a copolymer of ethylene and vinyl acetic acid, and a copolymer of ethylene and allyl acetic acid At least one copolymer selected from the group consisting of lithium, sodium, potassium, zinc and at least one metal selected from the group consisting of sodium and ethylene and acrylic acid; And zinc salts of copolymers of ethylene and methacrylic acid, and zinc salts of copolymers of ethylene and methacrylic acid.
The copolymer of ethylene and α, β-unsaturated carboxylic acid, which is a raw material of the metal salt of the copolymer of ethylene and α, β-unsaturated carboxylic acid, preferably has 70 to 98% by weight of ethylene units. The content of α, β-unsaturated carboxylic acid units is 30 to 2% by weight, more preferably 80 to 95% by weight of ethylene units and 20 to 5% by weight of α, β-unsaturated carboxylic acid units.
The degree of neutralization of the metal salt of the copolymer is preferably in the range of 10 to 40%.
[0011]
The method for producing the bag with a zipper of the present invention is not particularly limited, but the raw film of the bag can be produced by T-die processing, inflation processing or calendering processing. The chuck portion can be manufactured by a profile extrusion method.
Preferably, the bag body and the chuck are bonded by a high-frequency welding method. At this time, the bag body and the chuck can be manufactured by bonding simultaneously or separately.
[0012]
【The invention's effect】
As described in detail above, the bag with a zipper of the present invention is balanced with the flexibility of the bag body, the good occlusability of the chuck, the good adhesion of the zipper during high-frequency welding, and the bag body. We can provide excellent products.
[0013]
【Example】
Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto.
Next, methods for measuring physical properties in the examples are as follows.
(1) Melt flow rate (MFR)
According to the method specified in JIS K6760.
(2) An ethylene-containing press sheet was prepared, and the absorbance of the characteristic absorption of carbonyl (C = O) appearing at about 1700 cm -1 of the measured infrared absorption spectrum was corrected for the thickness, and the ester or carboxylic acid was calibrated by the calibration curve method. The content was determined, and the ethylene content was determined by calculation based on the content.
[0014]
Example 1
A copolymer of ethylene and methyl methacrylate (ethylene content 80% by weight, MFR3; (EMMA)) was used for the bag body, and a copolymer of ethylene and methacrylic acid (ethylene content 88% by weight, Using a zinc salt (methacrylic acid content: 12% by weight) (neutralization degree: 30%) (IO), a bag with a chuck was produced by a high-frequency welding method.
The high-frequency weldability, the occlusal property of the chuck portion, and the flexibility of the bag body were evaluated by visual observation and feel, and the results are shown in Table 1.
[0015]
Comparative Example 1
A bag with a zipper was manufactured in the same manner as in Example 1 except that the same EMMA used in the bag body of Example 1 was used as the chuck.
Table 1 shows the evaluation results.
[0016]
Comparative Example 2
A bag with a zipper was manufactured in the same manner as in Example 1, except that a high-pressure low-density polyethylene (LDPE) was used for the zipper portion.
Table 1 shows the evaluation results.
[0017]
Comparative Example 3
A bag with a zipper was manufactured in the same manner as in Example 1 except that the same IO as that used in the chuck portion of Example 1 was used for the bag body.
Table 1 shows the evaluation results.
[0018]
[Table 1]
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21778893A JP3568220B2 (en) | 1993-09-01 | 1993-09-01 | Bag with zipper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21778893A JP3568220B2 (en) | 1993-09-01 | 1993-09-01 | Bag with zipper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0769353A JPH0769353A (en) | 1995-03-14 |
| JP3568220B2 true JP3568220B2 (en) | 2004-09-22 |
Family
ID=16709738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21778893A Expired - Fee Related JP3568220B2 (en) | 1993-09-01 | 1993-09-01 | Bag with zipper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3568220B2 (en) |
-
1993
- 1993-09-01 JP JP21778893A patent/JP3568220B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0769353A (en) | 1995-03-14 |
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