JPH01264828A - Biaxially oriented polyester film - Google Patents
Biaxially oriented polyester filmInfo
- Publication number
- JPH01264828A JPH01264828A JP9473488A JP9473488A JPH01264828A JP H01264828 A JPH01264828 A JP H01264828A JP 9473488 A JP9473488 A JP 9473488A JP 9473488 A JP9473488 A JP 9473488A JP H01264828 A JPH01264828 A JP H01264828A
- Authority
- JP
- Japan
- Prior art keywords
- film
- intrinsic viscosity
- ratio
- stress
- slitting
- 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.)
- Granted
Links
- 229920006267 polyester film Polymers 0.000 title description 17
- -1 polyethylene terephthalate Polymers 0.000 claims abstract description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 claims abstract description 6
- 239000005020 polyethylene terephthalate Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000008188 pellet Substances 0.000 abstract description 7
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000009998 heat setting Methods 0.000 description 5
- 229920000728 polyester Polymers 0.000 description 5
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 4
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- PXGZQGDTEZPERC-UHFFFAOYSA-N 1,4-cyclohexanedicarboxylic acid Chemical compound OC(=O)C1CCC(C(O)=O)CC1 PXGZQGDTEZPERC-UHFFFAOYSA-N 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N 4-hydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 1
- 239000005711 Benzoic acid Substances 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical class C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- PDXRQENMIVHKPI-UHFFFAOYSA-N cyclohexane-1,1-diol Chemical compound OC1(O)CCCCC1 PDXRQENMIVHKPI-UHFFFAOYSA-N 0.000 description 1
- 150000001991 dicarboxylic acids Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- OJURWUUOVGOHJZ-UHFFFAOYSA-N methyl 2-[(2-acetyloxyphenyl)methyl-[2-[(2-acetyloxyphenyl)methyl-(2-methoxy-2-oxoethyl)amino]ethyl]amino]acetate Chemical compound C=1C=CC=C(OC(C)=O)C=1CN(CC(=O)OC)CCN(CC(=O)OC)CC1=CC=CC=C1OC(C)=O OJURWUUOVGOHJZ-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 125000005487 naphthalate group Chemical group 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229920001281 polyalkylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、スリット性等の加工特性に優れた二軸配向
ポリエステルフィルムに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a biaxially oriented polyester film that has excellent processing properties such as slitting properties.
（従来の技術）
二軸配向ポリエステルフィルムは、強度、寸法安定性、
耐熱性および表面平滑性等の諸物性に優れているので、
オーディオテープやビデオテープ等の磁気記録媒体のベ
ースフィルムとして使われている（特公昭５５−４０９
２９号公報参照）。(Prior art) Biaxially oriented polyester film has excellent strength, dimensional stability,
It has excellent physical properties such as heat resistance and surface smoothness, so
It is used as a base film for magnetic recording media such as audio tapes and video tapes.
(See Publication No. 29).
（発明が解決しようとする課題）
しかしながら、従来の二軸配向ポリエステルフィルムは
、上記のように強度や寸法安定性等の物性に優れている
反面、例えばベースフィルムの生産時に広幅のロールフ
ィルムをスリットして幾つかの狭い幅のロールに分割す
る場合、またはテンタのクリップに把持されていた耳端
部をスリットにより取除く場合、また磁気テープの製造
に際し広幅の状態で磁性層を塗布してこれを市販テープ
の幅にスリットする場合等のスリット性が必ずしも良好
でなく、スリット後のロール端面にフィルムの耳立ちが
起ったり、切り口が毛羽立ち、これが削られ、磁気テー
プにしたときのドロップアウトの原因になったりするた
め、ベースフィルム生産時の生産性および磁気テープに
加工する際の収率を低下させる結果になり、またスリッ
トの際にフィルムの削り粉末が発生し、これがフィルム
ロール内に入ってドロップアウトの原因になる等の開運
があった。そして、近年のビデオデツキ等の小型化に伴
ってベースフィルムの薄膜化が行なわれることにより、
上記のスリット性が更に悪化の傾向を示し、その改善が
望まれるようになった。(Problems to be Solved by the Invention) However, while conventional biaxially oriented polyester films have excellent physical properties such as strength and dimensional stability as described above, for example, when producing a base film, a wide roll film is slit. When the magnetic tape is divided into several narrow width rolls, or when the edge portions held in tenter clips are removed by slits, or when a magnetic layer is coated in a wide width state during the manufacture of magnetic tape. When slitting film to the width of a commercially available tape, the slitting properties are not always good, and after slitting, the edge of the film may appear on the end of the roll, or the cut end may become fluffy, which may be scraped, resulting in dropouts when made into magnetic tape. This results in lower productivity during base film production and lower yield when processing into magnetic tape.Furthermore, film scraping powder is generated during slitting, which may enter the film roll. There was good luck, such as being the cause of dropouts. In recent years, as video decks have become smaller, base films have become thinner.
The above-mentioned slitting property has shown a tendency to deteriorate further, and its improvement has become desired.
この発明の発明者は、フィルムのスリット性にはフィル
ムの幅方向の強度が関係するとの考えから幅方向の応力
−歪曲線を測定する一方、ミクロ的には、フィルムの切
断作業は分子間の切断作業であり、そのスリット性には
分子鎖長、すなわち分子のからみ合いが関係すると考え
られることからフィルムの固有粘度を測定し、その結果
、従来のフィルムは、その固有粘度が高過ぎたり、フィ
ルムの幅方向の破断強度と５％伸長時応力との比率が大
き過ぎたりするためスリット性が悪く、反対にこれらを
成る特定の範囲に限定することによってスリット性を良
好にし、しかも他の実用特性を阻害しないとの知見を得
、この発明を完成した。The inventor of this invention measured the stress-strain curve in the width direction based on the idea that the strength in the width direction of the film is related to the slitting properties of the film. Since it is a cutting operation and the slitting performance is thought to be related to the molecular chain length, that is, the entanglement of molecules, the intrinsic viscosity of the film was measured. The ratio of the breaking strength in the width direction of the film to the stress at 5% elongation is too large, resulting in poor slitting properties.On the other hand, by limiting these to a specific range, the slitting properties can be improved, and it is also useful for other practical applications. This invention was completed after obtaining the knowledge that the properties were not affected.
すなわち、この発明は、フィルムの固有粘度およびフィ
ルムの幅方向の破断強度と５％伸長時応力との比をそれ
ぞれ限定することにより、従来の問題点を解消し、スリ
ット性の良好な二軸配向ポリエステルフィルムを提供す
るものである。That is, this invention solves the conventional problems by limiting the intrinsic viscosity of the film and the ratio of the breaking strength in the width direction of the film to the stress at 5% elongation, and achieves biaxial orientation with good slitting properties. The present invention provides a polyester film.
（課題を解決するための手段）
この発明の二軸配向ポリエステルフィルムは、主として
ポリエチレンテレフタレートからなり、フィルムの固有
粘度が０．５５〜０．６０であり、幅方向の破断強度と
幅方向の５％伸長時応力との比が２．２０以下、好まし
くは２１．ＯＯ以下であることを特徴とする。(Means for Solving the Problems) The biaxially oriented polyester film of the present invention is mainly made of polyethylene terephthalate, has an intrinsic viscosity of 0.55 to 0.60, has a breaking strength in the width direction of % stress at elongation is 2.20 or less, preferably 21. It is characterized by being less than or equal to OO.
この発明のポリエステルは、ポリエチレンテレフタレー
ト、ポリアルキレンナフタレート等の結晶性ポリエステ
ルであり、好ましくはその繰返し単位の８０モル％以上
がエチレンテレフタレートからなるものである。他の共
重合成分としてイソフタル酸、ｐ−β−オキシエトキシ
安息香酸、２−６−ナフタレンジカルボン酸、 ４−４
’ −ジカルボキシルジフェノール、４−４′ −ジカ
ルボキシルベンゾフェノン、ビス（４−カルボキシルフ
ェノール）エタン、アジピン酸、セバシン酸、５−ナト
リウムスルホイソフタル酸、シクロヘキサン−１，４−
ジカルボン酸等のジカルボン酸成分、プロピレンゲリコ
ール、ブタンジオール、ネオペンチルグリコール、ジエ
チレングリコール、シクロヘキサンジオール、ビスフェ
ノールＡのエチレンオキサイド付加物、ポリエチレング
リコール、ポリプロピレングリコール、ポリテトラメチ
レングリコール等のグリコール成分、ｐ−オキシ安息香
酸なとのオキシカルボン酸成分等を任意に選択すること
ができる。また、その他の共重合成分としてアミド結合
、ウレタン結合、エーテル結合、カーボネート結合を含
有する少量の化合物を含むことができる。The polyester of the present invention is a crystalline polyester such as polyethylene terephthalate or polyalkylene naphthalate, and preferably 80 mol% or more of its repeating units consist of ethylene terephthalate. Other copolymerization components include isophthalic acid, p-β-oxyethoxybenzoic acid, 2-6-naphthalene dicarboxylic acid, 4-4
'-dicarboxyldiphenol, 4-4'-dicarboxylbenzophenone, bis(4-carboxylphenol)ethane, adipic acid, sebacic acid, 5-sodium sulfoisophthalic acid, cyclohexane-1,4-
Dicarboxylic acid components such as dicarboxylic acids, propylene gellicol, butanediol, neopentyl glycol, diethylene glycol, cyclohexanediol, ethylene oxide adducts of bisphenol A, glycol components such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, p-oxy Oxycarboxylic acid components such as benzoic acid can be arbitrarily selected. Further, a small amount of a compound containing an amide bond, urethane bond, ether bond, or carbonate bond may be included as another copolymer component.
上記ポリエステルの重合法として、芳香族ジカルボン酸
とグリコールを直接反応させる直接重合法、芳香族ジカ
ルボン酸のジメチルエステルとグリコールをエステル交
換反応させるエステル交換反応などの任意の重合法を適
用することができる。As the polymerization method for the above polyester, any polymerization method can be applied, such as a direct polymerization method in which aromatic dicarboxylic acid and glycol are directly reacted, and a transesterification reaction in which dimethyl ester of aromatic dicarboxylic acid and glycol are transesterified. .
また、二軸配向ポリエステルフィルムとは、上記ポリエ
ステルを公知の方法により溶融押出し、シート成形後、
縦−横または横−縦の二軸方向に延伸し、更に熱固定処
理を施したものであるが、熱固定処理の前に一軸または
二軸方向に再延伸したものでもよい。In addition, biaxially oriented polyester film refers to the above-mentioned polyester that is melt-extruded by a known method, formed into a sheet, and then
Although it is stretched biaxially (vertical-horizontal or horizontal-vertical) and further subjected to heat setting, it may be restretched uniaxially or biaxially before heat setting.
なお、上記のポリエステルには、必要に応じて滑剤とし
て作用する不活性微粒子を含有させることができる。In addition, the above-mentioned polyester can contain inert fine particles that act as a lubricant, if necessary.
（作用）
この発明の二軸配向ポリエステルフィルムは、優れたス
リット性を示すと共に、他の実用特性も十分に満たすこ
とができる。ただし、フィルムの固有粘度が０．５５よ
りも小さい場合は、フィルムがもろくなってフィルム生
産時に破断が生じ易くなり１反対に０．６０を超えた場
合は、フィルムの粘性が過大になってスリット性が低下
する。一方１幅方向の破断強度と５％伸長時応力との比
が２．２０よりも大きい場合は、スリットの際に、フィ
ルムの切り口が毛羽立ち、いわゆる耳立ちが生じ、また
磁性層を塗布した後にスリットした場合にフィルムの削
り粉末が生じ、これが原因でドロップアウトを発生し易
くする。これは、フィルムがカッタの刃で切断される際
に局所的な降伏伸びが発生することに起因し、フィルム
の切断端面が細かく不連続に伸びたり、フィルムが微細
に千切れたりするために起るものと考えられる。上記の
破断強度と５％伸長時応力との比が２．２０以下、特に
２．００以下であると、上記の局所的な降伏伸びが起こ
らず、良好なスリット性が得られるのである。(Function) The biaxially oriented polyester film of the present invention exhibits excellent slitting properties and can also satisfactorily satisfy other practical properties. However, if the intrinsic viscosity of the film is less than 0.55, the film will become brittle and will easily break during film production.On the other hand, if it exceeds 0.60, the viscosity of the film will be excessive and the slitting process will occur. Sexuality decreases. On the other hand, if the ratio of the breaking strength in one width direction to the stress at 5% elongation is larger than 2.20, the cut end of the film will become fluffy during slitting, resulting in so-called ridges. In this case, scraping powder of the film is generated, which makes dropouts more likely to occur. This is caused by the local yield elongation that occurs when the film is cut by the cutter blade, which causes the cut end of the film to elongate finely and discontinuously, and the film to tear into small pieces. It is considered that When the ratio of the above-mentioned breaking strength to the stress at 5% elongation is 2.20 or less, particularly 2.00 or less, the above-mentioned local yield elongation does not occur and good slitting properties can be obtained.
上記のフィルムの幅方向の破断強度と幅方向の５％伸長
時応力との比を２．２０以下に小さくするためには、フ
ィルムの固有粘度を小さくすることが効果的であるが、
前記のとおり、フィルムの固有粘度は０．５５以上でな
ければならない。固有粘度０．５５〜０．６０のフィル
ムは、固有粘度０．６５〜０．５６のポリマーペレット
を２７５〜３１０℃の温度範囲内、好ましくは固有粘度
０．６２〜０．５７のベレットを２８５〜２９５℃の温
度範囲内で溶融押出すことによって得られる。また、延
伸に関しては、上記の比を２．２０以下にするために分
子をフィルムの幅方向よりも長さ方向に向けることが好
ましい、横・縦の二軸延伸をする場合には、フィルムの
固有粘度を０．５５〜０．６０の範囲内で適宜選択する
ことによって上記の比を２．２０以下にすることができ
る。In order to reduce the ratio of the breaking strength in the width direction of the film to the stress at 5% elongation in the width direction to 2.20 or less, it is effective to reduce the intrinsic viscosity of the film.
As mentioned above, the intrinsic viscosity of the film must be greater than or equal to 0.55. Films with an intrinsic viscosity of 0.55 to 0.60 are produced by forming polymer pellets with an intrinsic viscosity of 0.65 to 0.56 within a temperature range of 275 to 310°C, preferably pellets having an intrinsic viscosity of 0.62 to 0.57 at 285°C. Obtained by melt extrusion within a temperature range of ~295°C. Regarding stretching, in order to keep the above ratio below 2.20, it is preferable to orient the molecules in the length direction of the film rather than in the width direction. By appropriately selecting the intrinsic viscosity within the range of 0.55 to 0.60, the above ratio can be made 2.20 or less.
また、縦・横の延伸を行なう場合は、横延伸の温度を縦
延伸の温度プラス２０℃以内に抑え、更にフィルムの固
有粘度を０．５８〜０．５５の範囲内にすることによっ
て上記の比を２．２０以下にすることができる。また、
フィルムの延伸後の熱固定処理を強化することも上記の
比を小さくすることに効果的であり、固有粘度０．５８
〜０．６０のフィルムを縦・横延伸で作る場合には、横
延伸の温度を縦延伸の温度プラス１５℃以内に抑え、か
つ延伸後のフィルムを２００〜２３０℃の温度で２秒以
上加熱処理することによって上記の比を２．２０以下に
することができる。更に、二軸延伸を行なった後に再縦
延伸を行なうことは、上記の比を小さくするために極め
て有効であり、良好なスリット性が得られる。In addition, when performing longitudinal and transverse stretching, the temperature of transverse stretching is kept within 20°C of the longitudinal stretching temperature, and the intrinsic viscosity of the film is kept within the range of 0.58 to 0.55. The ratio can be made 2.20 or less. Also,
Strengthening the heat setting treatment after stretching the film is also effective in reducing the above ratio, and the intrinsic viscosity is 0.58.
-0.60 by longitudinal and transverse stretching, keep the temperature of the transverse stretching within 15°C of the longitudinal stretching temperature, and heat the stretched film at a temperature of 200 to 230°C for 2 seconds or more. By processing, the above ratio can be reduced to 2.20 or less. Further, performing longitudinal re-stretching after biaxial stretching is extremely effective in reducing the above-mentioned ratio, and good slitting properties can be obtained.
これらの方法は、この発明でいう固有粘度０．５５〜０
．６０、幅方向の破断強度と幅方向の５％伸長時応力と
の比が２．２０以下の二軸配向フィルムを製造する方法
として好ましいが、特に限定されるものではない。These methods are suitable for achieving an intrinsic viscosity of 0.55 to 0 in this invention.
．． 60 is preferred as a method for producing a biaxially oriented film having a ratio of breaking strength in the width direction to stress at 5% elongation in the width direction of 2.20 or less, but is not particularly limited.
次に、この発明の詳細な説明するに先立ち。Next, before giving a detailed explanation of this invention.
破断強度、５％伸長時応力、スリット性および固有粘度
の測定方法を説明する。Methods for measuring breaking strength, stress at 5% elongation, slitting property, and intrinsic viscosity will be explained.
（１）破断強度、５％伸長時応力
東洋ボールドウィン社製テンシロンＵＴＭ−ＩＩ−５０
０型を使用し、温度２３℃、関係湿度６５％の条件下で
測定した。破断強度は、引張試験を行なった際の試料破
断時の応力（破断時の引張り荷重を試験前の試料の断面
積で除した値）を、また５％伸長時応力は、試料が５％
伸長した時点の応力をそれぞれ意味し、フィルムを長さ
方向に１０ｍ、幅方向に１５０ｍｍの長方形に切取って
試料片とし、上記試験機のチャック間にチャック間距離
がＬｏｏｍとなるように取付け、引張速度１００％／分
で引張試験を行ない、求めた値である。(1) Breaking strength, stress at 5% elongation Tensilon UTM-II-50 manufactured by Toyo Baldwin Co., Ltd.
Measurements were made using Type 0 at a temperature of 23° C. and relative humidity of 65%. The breaking strength is the stress at the time of sample breakage (the value obtained by dividing the tensile load at breakage by the cross-sectional area of the sample before the test) during a tensile test, and the stress at 5% elongation is the stress at 5% elongation of the sample.
Each means the stress at the time of elongation, cut the film into a rectangle of 10 m in the length direction and 150 mm in the width direction and use it as a sample piece, and install it between the chucks of the above testing machine so that the distance between the chucks is Loom, This value was obtained by conducting a tensile test at a tensile rate of 100%/min.
（２）スリット性
スリット性は、二軸配向ポリエステルフィルムをスリッ
トし、巻取って得られたロールの端面の状態によって判
定し、このロール端面を目視した際に毛羽立ちや皺のな
いものを１とし、以下４階級に分けてランク付けをした
。(2) Slitting property The slitting property is determined by the condition of the end face of the roll obtained by slitting and winding the biaxially oriented polyester film. If the end face of the roll is visually inspected, there is no fuzz or wrinkles. The rankings were divided into the following four classes.
（３）フィルムの固有粘度
テトラクロロエタン・フェノールの重量比６／４混合溶
液中、３０℃の条件下で測定した。(3) Intrinsic viscosity of film Measured in a mixed solution of tetrachloroethane/phenol in a weight ratio of 6/4 at 30°C.
（実施例）
固有粘度０．６０のポリエチレンテレフタレートのペレ
ットを十分に乾燥した後、押出し機に供給し温度２８０
℃で溶融押出し、これを温度３０℃に冷却固化して厚さ
１６０μの未配向フィルムを得、この未配向フィルムを
温度９０”Ｃで横方向に３．７倍延伸し、続いて９５℃
の温度で縦方向に３．６倍延伸し、更に２２０℃の温度
で３秒間の熱固定処理を行ない、冷却して巻取り、実施
例１の二軸配向ポリエステルフィルムを得た。(Example) After sufficiently drying polyethylene terephthalate pellets with an intrinsic viscosity of 0.60, they were fed to an extruder and heated to a temperature of 280.
The unoriented film was melt-extruded at 90"C and then solidified by cooling to 30"C to obtain a 160μ thick unoriented film.
The film was stretched 3.6 times in the longitudinal direction at a temperature of 220° C., further heat-set for 3 seconds at a temperature of 220° C., cooled and wound to obtain the biaxially oriented polyester film of Example 1.
実施例１の未配向フィルムを９０℃の温度で縦方向に３
．７倍延伸し、続いて９５℃の温度で横方向に３．６倍
延伸し、更に２３５℃×７秒間の熱固定処理を施して実
施例２の二軸配向ポリエステルフィルムを得た。The unoriented film of Example 1 was oriented in the longitudinal direction at a temperature of 90°C.
．． The film was stretched 7 times, then stretched 3.6 times in the transverse direction at a temperature of 95° C., and further heat-set at 235° C. for 7 seconds to obtain a biaxially oriented polyester film of Example 2.
実施例１において固有粘度０．７０のポリエチレンテレ
フタレートペレットを用いる以外は実施例１と同様にし
て比較例１の二軸配向ポリエステルフィルムを得た。A biaxially oriented polyester film of Comparative Example 1 was obtained in the same manner as in Example 1 except that polyethylene terephthalate pellets having an intrinsic viscosity of 0.70 were used in Example 1.
実施例１において、溶融押出し温度を３１０℃に変更す
る以外は実施例１と同様にして比較例２の二軸配向ポリ
エステルフィルムを得た。ただし、製造中に破断が多数
発生し、生産性が著しく悪かった。A biaxially oriented polyester film of Comparative Example 2 was obtained in the same manner as in Example 1 except that the melt extrusion temperature was changed to 310°C. However, many breaks occurred during manufacturing, resulting in extremely poor productivity.
実施例２において、延伸後の熱固定処理温度を１９０’
Ｃに変更した以外は実施例２と同様にして比較例３の二
軸配向ポリエステルフィルムを得た。In Example 2, the heat setting temperature after stretching was set to 190'
A biaxially oriented polyester film of Comparative Example 3 was obtained in the same manner as in Example 2 except that C was used.
実施例１と同様の方法で得られた未配向フィルムを温度
９０℃で横方向に３．７倍延伸し、続いて９５℃の温度
で縦方向に３．６倍延伸し、次いで縦方向に温度１２０
℃で１．１倍再延伸し、更に２２０℃の温度で３秒間の
熱固定処理を行ない、冷却して巻取り、実施例３の二軸
配向ポリエステルフィルムを得た。An unoriented film obtained in the same manner as in Example 1 was stretched 3.7 times in the transverse direction at a temperature of 90°C, then stretched 3.6 times in the machine direction at a temperature of 95°C, and then stretched in the machine direction by 3.6 times at a temperature of 95°C. temperature 120
The film was re-stretched 1.1 times at 220° C., further heat-set for 3 seconds at 220° C., cooled and wound to obtain the biaxially oriented polyester film of Example 3.
上記の実施例工ないし３および比較例１ないし３の二軸
配向ポリエステルフィルムの固有粘度、特性およびスリ
ット性を下記の表に示す。ただし、表中のＴ Ｓ （Ｔ
Ｄ）は幅方向の破断強度を、Ｆ５（ＴＤ）は幅方向の
５％伸長時応力を、Ｆ５（ＭＤ）は長さ方向の５％伸長
時応力をそれぞれ示す。The intrinsic viscosity, properties, and slitting properties of the biaxially oriented polyester films of Examples 1 to 3 and Comparative Examples 1 to 3 are shown in the table below. However, T S (T
D) represents the breaking strength in the width direction, F5 (TD) represents the stress at 5% elongation in the width direction, and F5 (MD) represents the stress at 5% elongation in the length direction.
表
上記の表で明らかなように、固有粘度および幅方向の破
断強度と５％伸長時応力との比ＴＳ （Ｔ［）） ／Ｆ
５ （ＴＤ）がこの発明の条件を満たす実施例１、実施
例２および実施例３は、スリット性が良好であると共に
生産に際して何の障害も発生しなかったが、比較例１は
固有粘度および比率ＴＳ （ＴＤ） ／ Ｆ５ （ＴＯ
）が双方とも過大であるためスリット性が最も悪く、比
較例２は固有粘度が低過ぎるため、スリット性は良いも
のの生産性が極めて悪く、また比較例３はＴＳ （ＴＯ
） ／ Ｆ５ （ＴＤ）が過大であるためスリット性が
不良であった。Table As is clear from the table above, the ratio of intrinsic viscosity and breaking strength in the width direction to stress at 5% elongation TS (T[)) /F
Examples 1, 2, and 3 whose TD (TD) satisfies the conditions of the present invention had good slitting properties and did not cause any trouble during production, but Comparative Example 1 had poor intrinsic viscosity and Ratio TS (TD) / F5 (TO
) are both excessive, so the slitting performance is the worst; Comparative Example 2 has too low an intrinsic viscosity, so although the slitting performance is good, the productivity is extremely poor; and Comparative Example 3 is TS (TO
) / F5 (TD) was excessive, so the slitting properties were poor.
（発明の効果）
この発明の二軸配向ポリエステルフィルムは、フィルム
の固有粘度を０．５５〜０．６０の範囲に限定し、かつ
幅方向の破断強度と５％伸長時応力との比率を２．２０
以下に限定したものであるから、生産性を下げることな
くスリット性を良好にすることができ、スリット後に巻
取って得られるロールの端面に毛羽立ちの生じることが
なく、そのため磁気記録媒体としたときのドロップアウ
トが減少し、収率が向上する。しかもペレットの固有粘
度、溶融押出し温度および延伸から熱固定に至る処理条
件を調整することによって製造することができ、特別の
設備を用意したり、特別の原料を使用したりする必要が
ない。(Effect of the invention) The biaxially oriented polyester film of the present invention has an inherent viscosity of the film limited to a range of 0.55 to 0.60, and a ratio of the breaking strength in the width direction to the stress at 5% elongation of 2. .20
Since it is limited to the following, it is possible to improve slitting performance without reducing productivity, and there is no fuzz on the end surface of the roll obtained by winding after slitting, and therefore when used as a magnetic recording medium. decreases dropout and improves yield. Furthermore, the pellets can be manufactured by adjusting the intrinsic viscosity of the pellets, the melt extrusion temperature, and the processing conditions from stretching to heat setting, and there is no need to prepare special equipment or use special raw materials.
Claims (1)
軸配向フィルムにおいて、上記フィルムの固有粘度が０
．５５〜０．６０であり、幅方向の破断強度と幅方向の
５％伸長時応力との比が２．２０以下であることを特徴
とする二軸配向ポリエステルフィルム。[Scope of Claims] [1] A biaxially oriented film mainly composed of polyethylene terephthalate, wherein the intrinsic viscosity of the film is 0.
．． 55 to 0.60, and the ratio of the breaking strength in the width direction to the stress at 5% elongation in the width direction is 2.20 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63094734A JPH0639128B2 (en) | 1988-04-18 | 1988-04-18 | Biaxially oriented polyester film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63094734A JPH0639128B2 (en) | 1988-04-18 | 1988-04-18 | Biaxially oriented polyester film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01264828A true JPH01264828A (en) | 1989-10-23 |
| JPH0639128B2 JPH0639128B2 (en) | 1994-05-25 |
Family
ID=14118343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63094734A Expired - Lifetime JPH0639128B2 (en) | 1988-04-18 | 1988-04-18 | Biaxially oriented polyester film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0639128B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2012086501A1 (en) * | 2010-12-24 | 2014-05-22 | 東レ株式会社 | Polyester film and laminate using the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53138477A (en) * | 1977-05-10 | 1978-12-02 | Teijin Ltd | Polyethylene terephthalate film |
| JPS5619263A (en) * | 1979-07-26 | 1981-02-23 | Meidensha Electric Mfg Co Ltd | Waveform shaping circuit |
| JPS57159619A (en) * | 1981-03-30 | 1982-10-01 | Teijin Ltd | Polyester film for magnetic recording tape |
-
1988
- 1988-04-18 JP JP63094734A patent/JPH0639128B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53138477A (en) * | 1977-05-10 | 1978-12-02 | Teijin Ltd | Polyethylene terephthalate film |
| JPS5619263A (en) * | 1979-07-26 | 1981-02-23 | Meidensha Electric Mfg Co Ltd | Waveform shaping circuit |
| JPS57159619A (en) * | 1981-03-30 | 1982-10-01 | Teijin Ltd | Polyester film for magnetic recording tape |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2012086501A1 (en) * | 2010-12-24 | 2014-05-22 | 東レ株式会社 | Polyester film and laminate using the same |
| JP5891792B2 (en) * | 2010-12-24 | 2016-03-23 | 東レ株式会社 | Polyester film and laminate using the same |
| TWI574838B (en) * | 2010-12-24 | 2017-03-21 | 東麗股份有限公司 | Polyester film and laminate using same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0639128B2 (en) | 1994-05-25 |
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