JP2853255B2 - Sealed container lid - Google Patents
Sealed container lidInfo
- Publication number
- JP2853255B2 JP2853255B2 JP9751990A JP9751990A JP2853255B2 JP 2853255 B2 JP2853255 B2 JP 2853255B2 JP 9751990 A JP9751990 A JP 9751990A JP 9751990 A JP9751990 A JP 9751990A JP 2853255 B2 JP2853255 B2 JP 2853255B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- mfr
- sealed container
- density
- vinyl acetate
- 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)
- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は密封容器の蓋に関する。特に透明性を改良し
た密封容器の蓋に関する。The present invention relates to a lid for a sealed container. In particular, it relates to a lid of a sealed container having improved transparency.
［従来の技術］ 密封容器は食品の保存用容器や電子レンジ用の容器と
して使用されている。そのため、容器の蓋には透明性が
要求されているものが多い。密封容器の蓋は低密度ポリ
エチレン（以下LDPEと略す），直鎖状低密度ポリエチレ
ン（以下LLDPEと略す），超低密度ポリエチレン（以下V
LDPEと略す），エチレン−酢酸ビニル共重合体（以下EV
Aと略す）等で成形されている。しかしLDPE,LLDPEでは
透明性及び柔軟性、VLDPEでは透明性及び製品ベタツ
キ、またEVAでは耐熱性等の問題があり、現在これらを
すべてクリアーする樹脂が要求されている。[Prior Art] Sealed containers are used as containers for preserving food and containers for microwave ovens. Therefore, many lids of containers require transparency. The lid of the sealed container is made of low-density polyethylene (hereinafter abbreviated as LDPE), linear low-density polyethylene (hereinafter abbreviated as LLDPE), ultra-low-density polyethylene (hereinafter abbreviated as V).
LDPE), ethylene-vinyl acetate copolymer (EV
A). However, LDPE and LLDPE have problems such as transparency and flexibility, VLDPE has problems such as transparency and stickiness, and EVA has problems such as heat resistance. Currently, resins that clear all of these are required.
［発明が解決しようとする課題］ 本発明は耐熱性をもち、さらに透明性の良好な密封容
器の蓋を提供することにある。[Problem to be Solved by the Invention] An object of the present invention is to provide a lid of a sealed container having heat resistance and good transparency.
［課題を解決するための手段］ 本発明者らはかかる点を考慮し、鋭意検討した結果、
VLDPEに特定のEVAをブレンドすることによりVLDPEの耐
熱性を低下させずに透明性を向上させかつVLDPE特有の
ベタツキを改良される事が判り本発明に至った。[Means for Solving the Problems] The present inventors have conducted intensive studies in consideration of such points, and have found that
It has been found that by blending a specific EVA with VLDPE, the transparency can be improved without lowering the heat resistance of the VLDPE, and the stickiness unique to the VLDPE can be improved.
即ち本発明は密度0.880〜0.915g/cm3,MFR4〜50g/10mi
nのエチレン−α−オレフィン（炭素数３〜10）共重合
体50〜90重量％と酢酸ビニル含量５〜20重量％,MFR4〜5
0g/10minのエチレン−酢酸ビニル共重合体50〜10重量％
の組成物を成形してなる密封容器の蓋にある。That is, the present invention has a density of 0.880 to 0.915 g / cm3, MFR of 4 to 50 g / 10 mi.
n ethylene-α-olefin (C 3-10) copolymer 50-90% by weight, vinyl acetate content 5-20% by weight, MFR 4-5
0 g / 10 min ethylene-vinyl acetate copolymer 50 to 10% by weight
In the lid of a sealed container obtained by molding the composition of
本発明において使用されるエチレン−α−オレフィン
共重合体としては気相性，溶液法，高圧法等の製造プロ
セスによって製造される、エチレンとC3〜C10のα−オ
レフィンのコポリマーがあり、C3〜C10のα−オレフィ
ンとしては例えばプロピレン,1−ブテン,1−ペンテン,1
−ヘキセン,4−メチル−１−ペンテン,1−オクテン,1−
デセン、或いはこれらの混合物等との共重合体がある。
これらのエチレン−α−オレフィン共重合体は密度0.91
5g/cm3以下,MFRが４〜50g/10minのものが適当であり、
密度が0.915g/cm3を超えたり、MFRが4g/10min未満では
良好な透明性が得られない。Examples of the ethylene-α-olefin copolymer used in the present invention include a copolymer of ethylene and a C 3 to C 10 α-olefin produced by a production process such as gas phase, solution method, and high pressure method. 3 -C 10 of α- olefins as for example propylene, 1-butene, 1-pentene, 1
-Hexene, 4-methyl-1-pentene, 1-octene, 1-
There is a copolymer with decene or a mixture thereof.
These ethylene-α-olefin copolymers have a density of 0.91.
5 g / cm 3 or less, MFR of 4 to 50 g / 10 min are suitable,
If the density exceeds 0.915 g / cm 3 or the MFR is less than 4 g / 10 min, good transparency cannot be obtained.
エチレン−酢酸ビニル共重合体は酢酸ビニル含量が５
〜20重量％のものであり、10〜15重量％のものが好まし
い。酢酸ビニル含量が５重量％未満及び20重量％を超え
たり、MFRが4g/10min未満では良好な透明性が得られな
い。The ethylene-vinyl acetate copolymer has a vinyl acetate content of 5
-20% by weight, preferably 10-15% by weight. If the vinyl acetate content is less than 5% by weight or more than 20% by weight, or if the MFR is less than 4 g / 10min, good transparency cannot be obtained.
配合量はエチレン−α−オレフィン共重合体50〜90重
量％とエチレン−酢酸ビニル共重合体50〜10重量％から
なるものが適当であり、エチレン−酢酸ビニル共重合体
の配合量が50重量％を超えると耐熱性が著しく低下す
る。The compounding amount is suitably composed of 50 to 90% by weight of the ethylene-α-olefin copolymer and 50 to 10% by weight of the ethylene-vinyl acetate copolymer, and the compounding amount of the ethylene-vinyl acetate copolymer is 50% by weight. %, The heat resistance is significantly reduced.
なお本発明におけるVLDPEとEVAのブレンド方法は特に
限定されるものではなく、慣用的方法が用いられる。例
えばドライブレンドによる方法または混練機によりメル
トブレンドする方法のいずれの方法でも良い。密封容器
の蓋には、射出成形法によりされる。The method of blending VLDPE and EVA in the present invention is not particularly limited, and a conventional method is used. For example, any method of dry blending or melt blending with a kneader may be used. The lid of the sealed container is formed by an injection molding method.
密封容器の蓋は食品の保存用容器や電子レンジ用の容
器に使用されている。密封容器本体は剛性が要求されて
いるため、材質はポリプロピレン製のものが多い。The lid of the sealed container is used for a container for storing food and a container for a microwave oven. Since the sealed container body is required to have rigidity, the material is often made of polypropylene.
［実施例］ 次に実施例で本発明を説明する。[Example] Next, the present invention will be described with reference to examples.
なお、以下の実施例及び比較例においての試験法は次
の方法によって行い、性能を評価した。In addition, the test method in the following Examples and Comparative Examples was performed by the following methods, and the performance was evaluated.
1.射出成形 下記の条件で成形したサンプルを打抜きヘーズ及びベ
タツキ測定用試験片とした。1. Injection molding A sample molded under the following conditions was used as a test piece for measuring punching haze and stickiness.
金型 270×300×2mmt密封容器の蓋 金型温度 30℃ シリンダ温度 C1/C2/C3/NH＝160/170/180/180℃ サイクル 射出15秒 冷却10秒 2.MFR及びねじり剛性率 JIS Ｋ 6730に準拠して測定した。Mold 270 × 300 × 2 mm lid mold temperature t sealed container 30 ° C. cylinder temperature C 1 / C 2 / C 3 / NH = 160/170/180/180 ℃ cycle exit 15 seconds cooling 10 seconds 2.MFR and torsional Rigidity Measured according to JIS K 6730.
3.熱変形温度 加熱ひずみ試験装置を使用して圧子の周辺部を第１図
の様にセットする。温度を120℃/Hrで上昇させ、圧子が
1mm沈んだ時の温度を熱変形温度とする。3. Thermal deformation temperature Set the periphery of the indenter as shown in Fig. 1 using a heating strain tester. Raise the temperature at 120 ° C / Hr,
The temperature at the time of sinking 1 mm is defined as the heat deformation temperature.
試験片 18×18×3mmt 荷重 1000g 4.ヘーズ １で得られた密封容器の蓋の中心部を打抜きヘーズを
測定した。Test piece 18 × 18 × 3 mm t load 1000 g 4. Haze The center of the lid of the sealed container obtained in 1 was punched out and the haze was measured.
5.ベタツキ １で得られたプレート板をｎ−ヘプタンで抽出しその
抽出物量を表面積当りに換算し最も少ないものを◎、最
も多いものを×とし、◎○△×の４段階で表示した。5. Stickiness The plate obtained in Step 1 was extracted with n-heptane, and the amount of the extract was converted per surface area.
実施例１ MFR20g/10min、密度0.898g/cm3のVLDPE60重量部にMFR
14g/10min、酢酸ビニル含量15重量％のEVA40重量部を射
出成形機にてメルトブレンドした。Example 1 MFR was added to 60 parts by weight of VLDPE having a MFR of 20 g / 10 min and a density of 0.898 g / cm 3.
14 g / 10 min, 40 parts by weight of EVA having a vinyl acetate content of 15% by weight were melt-blended by an injection molding machine.
比較例１ MFR20g/10min、密度0.898g/cm3のVLDPEを射出成形し
た。この場合にはベタツキが発生する。Comparative Example 1 VLDPE having an MFR of 20 g / 10 min and a density of 0.898 g / cm 3 was injection molded. In this case, stickiness occurs.
比較例２ MFR14g/10min、酢酸ビニル含量15重量％のEVAを射出
成形した。この場合には実施例１に比べ耐熱性が劣る。Comparative Example 2 EVA having an MFR of 14 g / 10 min and a vinyl acetate content of 15% by weight was injection molded. In this case, heat resistance is inferior to Example 1.
比較例３ MFR20g/10min、密度0.920g/cm3のLLDPEを射出成形し
た。この場合には柔軟性がない。Comparative Example 3 LLDPE having an MFR of 20 g / 10 min and a density of 0.920 g / cm 3 was injection-molded. In this case there is no flexibility.
比較例４ MFR20g/10min、密度0.898g/cm3のVLDPE60重量部にMFR
58g/10min、密度0.915g/cm3のLDPE40重量部を射出成形
機にてメルトブレンドした。この場合には透明性が改良
されない。Comparative Example 4 MFR added to 60 parts by weight of VLDPE having MFR of 20 g / 10 min and density of 0.898 g / cm 3
40 parts by weight of LDPE having a density of 0.915 g / cm 3 and a density of 58 g / 10 min were melt-blended by an injection molding machine. In this case, the transparency is not improved.
比較例５ MFR20g/10min、密度0.898g/cm3のVLDPE60重量部にMFR
30g/10min、酢酸ビニル含量32重量％のEVA40重量部を射
出成形機にてメルトブレンドした。この場合も比較例４
と同様である。Comparative Example 5 MFR was added to 60 parts by weight of VLDPE having a MFR of 20 g / 10 min and a density of 0.898 g / cm 3.
40 parts by weight of EVA having a vinyl acetate content of 32% by weight was melt-blended by an injection molding machine at 30g / 10min. Also in this case, Comparative Example 4
Is the same as
比較例６ MFR1.8g/10min、密度0.900g/cm3のVLDPE60重量部にMF
R1.5g/10min、酢酸ビニル含量15重量％のEVA40重量部を
射出成形機にてメルトブレンドした。この場合も比較例
４と同様である。Comparative Example 6 MF was added to 60 parts by weight of VLDPE having an MFR of 1.8 g / 10 min and a density of 0.900 g / cm 3.
R1.5g / 10min, 40 parts by weight of EVA having a vinyl acetate content of 15% by weight were melt-blended by an injection molding machine. This case is also the same as Comparative Example 4.
比較例７ MFR20g/10min、密度0.920g/cm3のLLDPE60重量部にMFR
14g/10min、酢酸ビニル含量15重量％のEVA40重量部を射
出成形機にてメルトブレンドした。この場合も比較例４
と同様である。Comparative Example 7 MFR was added to 60 parts by weight of LLDPE having an MFR of 20 g / 10 min and a density of 0.920 g / cm 3.
14 g / 10 min, 40 parts by weight of EVA having a vinyl acetate content of 15% by weight were melt-blended by an injection molding machine. Also in this case, Comparative Example 4
Is the same as
実施例２ MFR20g/10min、密度0.898g/cm3のVLDPE80重量部にMFR
14g/10min、酢酸ビニル含量15重量％のEVA20重量部を射
出成形機にてメルトブレンドした。この場合には透明
性、ベタツキともに良好である。Example 2 MFR was added to 80 parts by weight of VLDPE having a MFR of 20 g / 10 min and a density of 0.898 g / cm 3.
14 g / 10 min, 20 parts by weight of EVA having a vinyl acetate content of 15% by weight were melt-blended by an injection molding machine. In this case, both transparency and stickiness are good.
実施例３ MFR20g/10min、密度0.898g/cm3のVLDPE60重量部にMFR
9g/10min、酢酸ビニル含量15重量％のEVA40重量部を射
出成形機にてメルトブレンドした。この場合も実施例２
と同様である。Example 3 MFR was added to 60 parts by weight of VLDPE having a MFR of 20 g / 10 min and a density of 0.898 g / cm 3.
9 g / 10 min, 40 parts by weight of EVA having a vinyl acetate content of 15% by weight were melt-blended by an injection molding machine. Also in this case, the second embodiment
Is the same as
実施例４ MFR20g/10min、密度0.898g/cm3のVLDPE60重量部にMFR
20g/10min、酢酸ビニル含量20重量％のEVA40重量部を射
出成形機にてメルトブレンドした。この場合も実施例２
と同様である。Example 4 MFR was added to 60 parts by weight of VLDPE having a MFR of 20 g / 10 min and a density of 0.898 g / cm 3.
20 g / 10 min, 40 parts by weight of EVA having a vinyl acetate content of 20% by weight were melt-blended by an injection molding machine. Also in this case, the second embodiment
Is the same as
［効果］ 以上の説明から明らかなように、本発明は柔軟性及び
耐熱性をもち、さらに透明性の良好な密封容器の蓋を提
供する。 [Effects] As is clear from the above description, the present invention provides a lid of a sealed container having flexibility and heat resistance and further having good transparency.
第１図は加熱ひづみ試験装置の圧子周辺部の拡大図を示
す。 （Ａ）は正面図、（Ｂ）は側面図を示す。 １……荷重棒 ２……圧子 ３……試験片FIG. 1 is an enlarged view of the periphery of an indenter of a heating honing test device. (A) shows a front view and (B) shows a side view. 1. Load bar 2. Indenter 3. Test piece
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) C08L 23/00 - 23/36 C08L 31/04 B65D 77/20──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 6 , DB name) C08L 23/00-23/36 C08L 31/04 B65D 77/20
Claims (1)
ト（MFR）４〜50g/10minの、エチレンと炭素数３〜10の
α−オレフィンとの共重合体50〜90重量％と酢酸ビニル
含量５〜20重量％,MFR4〜50g/10minのエチレン−酢酸ビ
ニル共重合体50〜10重量％の組成物を成形してなる密封
容器の蓋。1. A copolymer of ethylene and an α-olefin having 3 to 10 carbon atoms having a density of 0.880 to 0.915 g / cm 3 and a melt flow rate (MFR) of 4 to 50 g / 10 min. A lid of a sealed container formed by molding a composition of 50 to 10% by weight of an ethylene-vinyl acetate copolymer having a vinyl content of 5 to 20% by weight and an MFR of 4 to 50 g / 10min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9751990A JP2853255B2 (en) | 1990-04-16 | 1990-04-16 | Sealed container lid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9751990A JP2853255B2 (en) | 1990-04-16 | 1990-04-16 | Sealed container lid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03296547A JPH03296547A (en) | 1991-12-27 |
| JP2853255B2 true JP2853255B2 (en) | 1999-02-03 |
Family
ID=14194508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9751990A Expired - Fee Related JP2853255B2 (en) | 1990-04-16 | 1990-04-16 | Sealed container lid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2853255B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3044258B2 (en) | 1990-10-22 | 2000-05-22 | 東ソー株式会社 | Resin composition |
-
1990
- 1990-04-16 JP JP9751990A patent/JP2853255B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3044258B2 (en) | 1990-10-22 | 2000-05-22 | 東ソー株式会社 | Resin composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03296547A (en) | 1991-12-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |