JPH0662845B2 - Polyamide film with excellent pinhole resistance - Google Patents

Polyamide film with excellent pinhole resistance

Info

Publication number
JPH0662845B2
JPH0662845B2 JP989688A JP989688A JPH0662845B2 JP H0662845 B2 JPH0662845 B2 JP H0662845B2 JP 989688 A JP989688 A JP 989688A JP 989688 A JP989688 A JP 989688A JP H0662845 B2 JPH0662845 B2 JP H0662845B2
Authority
JP
Japan
Prior art keywords
film
polyamide
polycaprolactone
biaxially stretched
present
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP989688A
Other languages
Japanese (ja)
Other versions
JPH01185363A (en
Inventor
晃 榎田
忠晴 藤井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unitika Ltd
Original Assignee
Unitika Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Unitika Ltd filed Critical Unitika Ltd
Priority to JP989688A priority Critical patent/JPH0662845B2/en
Publication of JPH01185363A publication Critical patent/JPH01185363A/en
Publication of JPH0662845B2 publication Critical patent/JPH0662845B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は低温度下においても優れた耐ピンホール性を有
するポリアミド系フィルムに関する。
The present invention relates to a polyamide film having excellent pinhole resistance even at low temperatures.

(従来の技術) ポリアミドの2軸延伸フィルムは一般機械特性,熱的特
性,バリヤー性はもちろんのこと,包装材料分野で重要
視される耐摩耗性,耐衝撃性および耐ピンホール性に優
れることから,食品包装分野を中心に広く用いられてい
る。
(Prior Art) Polyamide biaxially stretched film not only has general mechanical properties, thermal properties, and barrier properties, but also has excellent abrasion resistance, impact resistance, and pinhole resistance, which are important in the packaging material field. Therefore, it is widely used mainly in the food packaging field.

(発明が解決しようとする課題) しかしながら,上記特性中においても実用上最も重要視
される耐ピンホール性についてはその温度依存性が顕著
であり,10℃以下のような低温度下での使用において,
しばしば繰り返し屈曲疲労の結果生じるピンホールによ
る充填物の漏れ出しなどのトラブルが発生し,その使用
は制限されていた。
(Problems to be solved by the invention) However, the pinhole resistance, which is most important in practical use among the above characteristics, has a remarkable temperature dependence, and is used under a low temperature such as 10 ° C or less. At
There were often problems such as leakage of fillers due to pinholes resulting from repeated bending fatigue, and their use was limited.

(課題を解決するための手段) 本発明者らは,かかる欠点を改善すべく検討した結果,
ポリカプロラクトンを特定量添加し,かつ得られるフィ
ルムの厚みを限定することによりポリアミドフィルムの
低温度下における耐ピンホール性が改善されることを見
い出し本発明に到達したのである。
(Means for Solving the Problems) As a result of investigations aimed at improving such drawbacks, the present inventors found that
The inventors have found that the pinhole resistance of a polyamide film at low temperatures is improved by adding a specific amount of polycaprolactone and limiting the thickness of the film obtained, and arrived at the present invention.

すなわち本発明は,ポリアミド99.9〜95wt%とポリカプ
ロラクトン0.1〜5wt%との混合体からなる厚み1〜50
μの2軸延伸フィルムであり,その5℃における1000回
繰り返し屈曲疲労テストにおけるピンホールの発生個数
が10個以下であることを特徴とする2軸延伸ポリアミド
系フィルムである。
That is, the present invention provides a mixture of polyamide 99.9-95 wt% and polycaprolactone 0.1-5 wt% with a thickness of 1-50.
It is a biaxially stretched film of μ, and the number of pinholes is 10 or less in a 1000 times repeated bending fatigue test at 5 ° C., and is a biaxially stretched polyamide film.

次に本発明を詳細に説明する。Next, the present invention will be described in detail.

本発明におけるポリアミドとは,その分子内にアミド結
合−CONH−を有する線状高分子化合物であり,ポリ
カプロラクタム(ナイロン6),ポリヘキサメチレンア
ジパミド(ナイロン66),ポリヘキサメチレンセバカミ
ド(ナイロン610),ポリアミノウンデカン酸(ナイロ
ン11),ポリラウリンラクタム(ナイロン12)およびそ
れらの共重合物などが含まれる。特に本発明に好適なポ
リアミドとしてはポリカプロラクタム(ナイロン6),
およびポリヘキサメチレンアジパミド(ナイロン66)を
挙げることができる。
The polyamide in the present invention is a linear polymer compound having an amide bond —CONH— in its molecule, such as polycaprolactam (nylon 6), polyhexamethyleneadipamide (nylon 66), polyhexamethylenesebacamide. (Nylon 610), polyaminoundecanoic acid (nylon 11), polylaurinlactam (nylon 12) and their copolymers are included. Polyamide which is particularly suitable for the present invention includes polycaprolactam (nylon 6),
And polyhexamethylene adipamide (nylon 66).

また本発明のポリカプロラクトンとはε−カプロラクト
ンの開環重合により得られる−(CHCOO−の
繰り返し単位からなる線状ポリエステル化合物である。
本発明のポリカプロラクトンの分子量は5,000〜100,00
0,好ましくは10,000〜70,000である。分子量が5,000よ
り小さくなるとポリアミドとの混合体から得られる2軸
延伸フィルムについて本発明の目的とする特性値(5℃
における1000回繰り返し屈曲疲労テストにおけるピンホ
ールの発生個数が10個以下)を得ることができない。
The polycaprolactone and is obtained by ring-opening polymerization of ε- caprolactone present invention - (CH 2) linear polyester compound composed of 5 COO- repeating units.
The molecular weight of the polycaprolactone of the present invention is 5,000 to 100,00.
It is 0, preferably 10,000 to 70,000. When the molecular weight is less than 5,000, a biaxially stretched film obtained from a mixture with polyamide will have the characteristic value (5 ° C
The number of pinholes generated in the 1000 times repeated bending fatigue test is less than 10) cannot be obtained.

一方,分子量が100,000を超えるとポリアミドとの混合
体から得られる2軸延伸フィルムについて本発明の目的
とする特性値を達成することはできるが,該フィルムの
透明性が著しく悪くなり実用に耐えない。
On the other hand, when the molecular weight is more than 100,000, the biaxially stretched film obtained from the mixture with polyamide can achieve the characteristic values aimed at by the present invention, but the transparency of the film is remarkably deteriorated and it cannot be put to practical use. .

本発明のポリアミドとポリカプロラクトンの混合割合
は,ポリアミドに対してポリカプロラクトンが0.1〜5w
t%,好ましくは0.5〜3wt%である。ポリカプロラクト
ンが0.1wt%より少ないとポリアミドとの混合体から得
られる2軸延伸フィルムについて本発明の目的とする特
性値を得ることはできない。
The mixing ratio of the polyamide of the present invention and polycaprolactone is 0.1 to 5 w of polycaprolactone to polyamide.
t%, preferably 0.5-3 wt%. If the content of polycaprolactone is less than 0.1% by weight, the characteristic value targeted by the present invention cannot be obtained for the biaxially stretched film obtained from the mixture with polyamide.

一方,ポリカプロラクトンが5wt%より多い場合はポリ
アミドとの混合体から得られる2軸延伸フィルムについ
て本発明の目的とする特性値は得られるが,該2軸延伸
フィルムの透明性が著しく悪くなり実用に耐えなくな
る。ポリアミドとポリカプロラクトンとの混合体から2
軸延伸フィルムを得る方法について特に限定するもので
はなく,通常公知の方法を用いることができる。
On the other hand, when the content of polycaprolactone is more than 5% by weight, the biaxially stretched film obtained from the mixture with the polyamide can obtain the characteristic values aimed at by the present invention, but the transparency of the biaxially stretched film is remarkably deteriorated and practically used. Can not stand. 2 from a mixture of polyamide and polycaprolactone
The method for obtaining the axially stretched film is not particularly limited, and a commonly known method can be used.

たとえば,まずポリアミドとポリカプロラクトンをブレ
ンドした後,押出機で溶融混練し混合体のペレットを得
る。次いでこの混合体のペレットを再溶融し,Tダイ
法,インフレーション法等によって製膜し,未延伸フィ
ルムを製造する。或いはポリアミドとポリカプロラクト
ンをブレンドした後,押出機で溶融混練し,そのまま上
記の方法により製膜し,未延伸フィルムとすることもで
きる。
For example, polyamide and polycaprolactone are first blended and then melt-kneaded in an extruder to obtain pellets of a mixture. Next, the pellets of this mixture are remelted and formed into a film by a T-die method, an inflation method or the like to produce an unstretched film. Alternatively, the polyamide and the polycaprolactone may be blended, melt-kneaded with an extruder, and directly formed into a film by the above method to obtain an unstretched film.

このようにして製造された未延伸フィルムは逐次または
同時2軸延伸される。延伸の温度はポリアミドフィルム
の場合とほぼ同様の温度で行うことができるが,必要に
応じて変更した温度で行ってもかまわない。また延伸倍
率は必要に応じて縦,横方向とも1.2〜6倍の範囲で行
うことができる。
The unstretched film thus produced is sequentially or simultaneously biaxially stretched. The stretching temperature may be almost the same as in the case of the polyamide film, but the temperature may be changed if necessary. If necessary, the stretching ratio can be 1.2 to 6 times in both the longitudinal and transverse directions.

このようにして得られる2軸延伸フィルムの厚みは1〜
50μ,好ましくは5〜40μである。
The biaxially stretched film thus obtained has a thickness of 1 to
It is 50μ, preferably 5-40μ.

本発明でいう耐ピンホール性は厚み依存性を有しており
フィルムが厚くなる程劣る。フィルム厚みが50μを超え
ると,ポリカプロラクトンを添加しても本発明の目的と
する特性値を得ることはできない。
The pinhole resistance referred to in the present invention has thickness dependency, and becomes worse as the film becomes thicker. If the film thickness exceeds 50 μm, the characteristic value targeted by the present invention cannot be obtained even if polycaprolactone is added.

また,フィルム厚みが1μより小さいと強度保持材とし
て使用に耐えない。
If the film thickness is less than 1 μm, it cannot be used as a strength retaining material.

本発明の2軸延伸フィルムは必要に応じて熱処理が施さ
れる。また,本発明の2軸延伸フィルムは2層以上から
なる複合フィルムの1層としても使用可能である。
The biaxially stretched film of the present invention is optionally heat treated. The biaxially stretched film of the present invention can also be used as one layer of a composite film composed of two or more layers.

さらに本発明のフィルムには必要に応じて通常公知の添
加剤,たとえば酸化防止剤,結晶核剤,滑剤,帯電防止
剤などを添加することもできる。
Further, if necessary, generally known additives such as an antioxidant, a crystal nucleating agent, a lubricant and an antistatic agent may be added to the film of the present invention.

次に本発明の特性値の測定方法を説明する。Next, the method for measuring the characteristic value of the present invention will be described.

低温耐ピンホール性(繰り返し屈曲疲労テスト) MIL-B-131Fに示されるFed.Test Method Std.No.101CのM
ethod 2017に従い,いわゆるゲルボテスターで5℃下で
1000回繰り返し屈曲を加えた後,フィルムに生じるピン
ホールの個数をその値とした。
Low temperature pinhole resistance (repeated bending fatigue test) M of Fed. Test Method Std. No. 101C shown in MIL-B-131F
According to ethod 2017, so called gel bot tester under 5 ℃
The value is the number of pinholes formed in the film after repeated bending 1000 times.

透明性(曇価) JIS-K-6714法により測定した。Transparency (cloudiness value) Measured by JIS-K-6714 method.

(作用) 本発明ではポリアミドに限定された分子量を有するポリ
カプロラクトンを特定量添加し,かつそのフィルム厚み
を限定することにより,ポリアミドフィルムの低温度下
における耐ピンホール性が著しく改善される。この原理
については詳しくは判らないが,ガラス転移温度が-60
℃と非常に低く低温度下における衝撃特性に優れるポリ
カプロラクトンをポリアミドに添加することにより屈曲
時にフィルムに加えられる衝撃力がポリカプロラクトン
により分散され,その結果低温度下における繰り返し屈
曲疲労によるピンホールの発生が著しく減少するものと
考えられる。
(Function) In the present invention, by adding a specific amount of polycaprolactone having a limited molecular weight to polyamide and limiting the film thickness thereof, the pinhole resistance of the polyamide film at low temperature is significantly improved. The details of this principle are unknown, but the glass transition temperature is -60.
The impact force applied to the film during bending is dispersed by polycaprolactone by adding polycaprolactone, which has excellent impact properties at low temperature as low as ℃, to polyamide, and as a result, pinholes due to repeated bending fatigue at low temperature are formed. It is considered that the occurrence will be significantly reduced.

しかしこのような耐ピンホール性は厚み依存性を有して
おり,フィルムが厚くなるほどこの特性は劣ってくる。
したがって上記ポリカプロラクトンを特定量添加し,か
つフィルム厚みを本発明の範囲に限定することによりは
じめて本発明の耐ピンホール性を達成することができる
のである。
However, such pinhole resistance depends on the thickness, and the thicker the film, the worse this property becomes.
Therefore, the pinhole resistance of the present invention can be achieved only by adding a specific amount of the above polycaprolactone and limiting the film thickness within the range of the present invention.

(実施例) 本発明をより理解し易くするために,比較例および実施
例を挙げて具体的に説明するが,本発明はこれら実施例
に限定されるものではない。
(Examples) In order to make the present invention easier to understand, specific examples and comparative examples will be described, but the present invention is not limited to these examples.

比較例1 96%濃硫酸中で25℃で測定した相対粘度3.0のポリカプ
ロラクタムを270℃でTダイより溶融押出しし,30℃の
ドラム上で冷却して173μの未延伸フィルムを得た。続
いてこのフィルムを縦方向に3.3倍,横方向に3.5倍80℃
で同時2軸延伸し15μの2軸延伸フィルムを得た。
Comparative Example 1 Polycaprolactam having a relative viscosity of 3.0 measured at 25 ° C. in 96% concentrated sulfuric acid was melt extruded from a T die at 270 ° C. and cooled on a drum at 30 ° C. to obtain a 173 μ unstretched film. Then, this film is 3.3 times lengthwise and 3.5 times widthwise 80 ℃
Was simultaneously biaxially stretched to obtain a 15 μ biaxially stretched film.

比較例2 比較例1のポリカプロラクタム98wt%と分子量3,000の
ポリカプロラクトン2wt%を混合し,250℃に設定した
押出機で溶融混練しペレット化した。
Comparative Example 2 98% by weight of polycaprolactam of Comparative Example 1 and 2% by weight of polycaprolactone having a molecular weight of 3,000 were mixed and melt-kneaded by an extruder set at 250 ° C. to form pellets.

次いでこのペレットを比較例1と同様の方法で押出し延
伸し,15μの2軸延伸フィルムを得た。
Then, the pellets were extruded and stretched in the same manner as in Comparative Example 1 to obtain a 15 μ biaxially stretched film.

実施例1 比較例1のポリカプロラクタム98wt%と分子量10,000の
ポリカプロラクトン2wt%から比較例2の方法に従い15
μの2軸延伸フィルムを得た。
Example 1 From 98 wt% of polycaprolactam of Comparative Example 1 and 2 wt% of polycaprolactone having a molecular weight of 10,000, the method of Comparative Example 2 was used.
A biaxially stretched film of μ was obtained.

実施例2 比較例1のポリカプロラクタム98wt%と分子量40,000の
ポリカプロラクトン2wt%から比較例2の方法に従い,
15μの2軸延伸フィルムを得た。
Example 2 According to the method of Comparative Example 2, 98% by weight of polycaprolactam of Comparative Example 1 and 2% by weight of polycaprolactone having a molecular weight of 40,000 were used.
A 15μ biaxially stretched film was obtained.

比較例3 比較例1のポリカプロラクタム98wt%と分子量150,000
のポリカプロラクトン2wt%から比較例2の方法に従い
15μの2軸延伸フィルムを得た。
Comparative Example 3 Polycaprolactam of Comparative Example 1 98 wt% and molecular weight 150,000
According to the method of Comparative Example 2 from 2 wt% of polycaprolactone of
A 15μ biaxially stretched film was obtained.

比較例4 比較例1のポリカプロラクタム99.95wt%と分子量40,00
0のポリカプロラクトン0.05wt%から比較例2の方法に
従い15μの2軸延伸フィルムを得た。
Comparative Example 4 Polycaprolactam of Comparative Example 1 99.95 wt% and molecular weight 40,00
According to the method of Comparative Example 2, a biaxially stretched film of 15μ was obtained from 0.05 wt% of polycaprolactone of 0.

実施例3 比較例1のポリカプロラクタム99wt%と分子量40,000の
ポリカプロラクトン1wt%から比較例2の方法に従い15
μの2軸延伸フィルムを得た。
Example 3 From 99 wt% of polycaprolactam of Comparative Example 1 and 1 wt% of polycaprolactone having a molecular weight of 40,000, the method of Comparative Example 2 was used.
A biaxially stretched film of μ was obtained.

比較例5 比較例1のポリカプロラクタム94wt%と分子量40,000の
ポリカプロラクトン6wt%から比較例2の方法に従い15
μの2軸延伸フィルムを得た。
Comparative Example 5 Polycaprolactam of 94% by weight in Comparative Example 1 and polycaprolactone of 6% by weight having a molecular weight of 40,000 were used according to the method of Comparative Example 2.
A biaxially stretched film of μ was obtained.

比較例6 比較例1のポリカプロラクタム98wt%と分子量40,000の
ポリカプロラクトン2wt%から比較例1の方法に従い69
0μの未延伸フィルムを得た。
Comparative Example 6 According to the method of Comparative Example 1, 98% by weight of polycaprolactam of Comparative Example 1 and 2% by weight of polycaprolactone having a molecular weight of 40,000 were used.
An unstretched film of 0 μ was obtained.

続いてこのフィルムを比較例1と同様の方法で延伸し60
μの2軸延伸フィルムを得た。
Subsequently, this film was stretched in the same manner as in Comparative Example 1 60
A biaxially stretched film of μ was obtained.

以上の比較例および実施例のフィルムの特性値を第1表
に示した。
The characteristic values of the films of the above Comparative Examples and Examples are shown in Table 1.

この表から明らかなように,本発明のフィルムのみが低
温度下における耐ピンホール性および透明性に優れてい
る。
As is clear from this table, only the film of the present invention has excellent pinhole resistance and transparency at low temperatures.

(発明の効果) 本発明によれば,ポリアミドに限定された分子量を有す
るポリカプロラクトンを特定量添加し,かつ得られるフ
ィルムの厚みを限定することにより,ポリアミドフィル
ムにとって実用上重要な低温度下における耐ピンホール
性を改善することが可能となる。
(Effect of the Invention) According to the present invention, by adding a specific amount of polycaprolactone having a limited molecular weight to polyamide and limiting the thickness of the obtained film, it is possible to obtain a polyamide film at a low temperature which is practically important. It is possible to improve the pinhole resistance.

また本発明により,これまで制限されていたポリアミド
フィルムの低温度下での使用範囲が大きく広がることに
なる。
Further, according to the present invention, the range of use of the polyamide film, which has been limited so far, at a low temperature is greatly expanded.

フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 (C08L 77/00 67:04) Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location (C08L 77/00 67:04)

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】ポリアミド99.9〜95wt%と,分子量5,000
〜100,000のポリカプロラクトン0.1〜5wt%とを溶融混
合して得られた組成物からなる厚み1〜50μの2軸延伸
フィルムであり,その5℃における1000回繰り返し屈曲
疲労テストにおけるピンホールの発生個数が10個以下で
あることを特徴とする2軸延伸ポリアミド系フィルム。
1. Polyamide 99.9 to 95 wt% and molecular weight 5,000
Is a biaxially stretched film with a thickness of 1 to 50μ, which is composed of a composition obtained by melt-mixing 0.1 to 5% by weight of polycaprolactone of 0.1 to 5% by weight, and the number of pinholes generated in a flex fatigue test 1000 times at 5 ° C. The biaxially stretched polyamide-based film is characterized by having 10 or less.
JP989688A 1988-01-19 1988-01-19 Polyamide film with excellent pinhole resistance Expired - Lifetime JPH0662845B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP989688A JPH0662845B2 (en) 1988-01-19 1988-01-19 Polyamide film with excellent pinhole resistance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP989688A JPH0662845B2 (en) 1988-01-19 1988-01-19 Polyamide film with excellent pinhole resistance

Publications (2)

Publication Number Publication Date
JPH01185363A JPH01185363A (en) 1989-07-24
JPH0662845B2 true JPH0662845B2 (en) 1994-08-17

Family

ID=11732887

Family Applications (1)

Application Number Title Priority Date Filing Date
JP989688A Expired - Lifetime JPH0662845B2 (en) 1988-01-19 1988-01-19 Polyamide film with excellent pinhole resistance

Country Status (1)

Country Link
JP (1) JPH0662845B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0771853A2 (en) 1995-11-02 1997-05-07 Ube Industries, Ltd. Polyamide resin composition

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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US5352498A (en) * 1992-08-19 1994-10-04 The Goodyear Tire & Rubber Company Package for compounding rubber and compounded rubber
JP4567964B2 (en) * 2003-12-15 2010-10-27 ユニチカ株式会社 Biaxially stretched laminated film

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0771853A2 (en) 1995-11-02 1997-05-07 Ube Industries, Ltd. Polyamide resin composition

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