JPH02165413A - Polyester film for magnetic recording tape - Google Patents
Polyester film for magnetic recording tapeInfo
- Publication number
- JPH02165413A JPH02165413A JP32001388A JP32001388A JPH02165413A JP H02165413 A JPH02165413 A JP H02165413A JP 32001388 A JP32001388 A JP 32001388A JP 32001388 A JP32001388 A JP 32001388A JP H02165413 A JPH02165413 A JP H02165413A
- Authority
- JP
- Japan
- Prior art keywords
- film
- longitudinal direction
- polyester
- denotes
- refractive index
- 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.)
- Pending
Links
- 229920006267 polyester film Polymers 0.000 title claims abstract description 17
- 239000000126 substance Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 229920000728 polyester Polymers 0.000 description 12
- 238000001816 cooling Methods 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 5
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000002585 base Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- -1 aromatic dicarboxylic acids Chemical class 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 150000002334 glycols Chemical class 0.000 description 4
- 238000006068 polycondensation reaction Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 150000002009 diols Chemical class 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 230000009477 glass transition Effects 0.000 description 3
- 238000009998 heat setting Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 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
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 241001422033 Thestylus Species 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001339 alkali metal compounds Chemical class 0.000 description 1
- 150000001341 alkaline earth metal compounds Chemical class 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- AAEHPKIXIIACPQ-UHFFFAOYSA-L calcium;terephthalate Chemical compound [Ca+2].[O-]C(=O)C1=CC=C(C([O-])=O)C=C1 AAEHPKIXIIACPQ-UHFFFAOYSA-L 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000000787 lecithin Substances 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920002959 polymer blend Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、オーディオあるいはビデオ用等の磁気記録テ
ープの基材として好適なポリエステルフィルムに関する
。更に詳しくは、機械的性質、熱的特性、厚さ斑に優れ
た磁気記録テープ用ポリエステルフィルムに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polyester film suitable as a base material for magnetic recording tape for audio or video use. More specifically, the present invention relates to a polyester film for magnetic recording tape that has excellent mechanical properties, thermal properties, and thickness unevenness.
〔従来の技術および発明が解決しようとする課題〕ポリ
エステルニ軸配向フィルムは、優れた機械的性質、熱的
性質、電気的性質、耐薬品性等を有するための各種用途
に適用されており、特に磁気テープ用ベースフィルムと
して有用である。[Prior Art and Problems to be Solved by the Invention] Biaxially oriented polyester films are used in various applications due to their excellent mechanical properties, thermal properties, electrical properties, chemical resistance, etc. It is particularly useful as a base film for magnetic tapes.
ポリエステルフィルムを磁気テープ用ベースフィルムと
して用いた場合、用いるベースフィルムの特性が、磁気
テープとしての品質に強く影響を与えるため、磁気テー
プの技術進歩に伴ってベースフィルムに対する高品質化
の要求も近年ますます増大している。具体的には、ビデ
オ用磁気テープに対する長時間化、電磁変換特性の向上
環の要求がある。When polyester film is used as a base film for magnetic tape, the characteristics of the base film used have a strong influence on the quality of the magnetic tape, so in recent years there has been a demand for higher quality base films as magnetic tape technology advances. It is increasing. Specifically, there are demands for video magnetic tapes to have longer recording times and improved electromagnetic conversion characteristics.
しかしながらテープの長時間化のためにフィルムの縦強
度を高くして薄膜化すると、それに伴い、スキューが大
きくなる。また走行性を与えようとすると電磁変換特性
も悪化し、磁気テープ用ポリエステルフィルムとして好
適なものは得られていなかった。However, if the longitudinal strength of the film is increased to make the film thinner in order to extend the tape's length, the skew increases accordingly. Furthermore, when trying to impart runnability, the electromagnetic conversion properties also deteriorated, and a polyester film suitable for use in magnetic tapes could not be obtained.
本発明者らは、上記課題を解決すべく、鋭意検討した結
果、ポリエステルフィルムの物性がある特定の関係を満
たすものが磁気テープ用フィルムとして好適であること
を見い出し、本発明を完成するに至った。In order to solve the above problems, the present inventors have made extensive studies and have discovered that a polyester film that satisfies a certain physical property relationship is suitable as a film for magnetic tape, and has completed the present invention. Ta.
すなわち本発明め要旨は、下記式［１］〜［３］を同時
に満足することを特徴とする磁気記録テープ用ポリエス
テルフィルムに存する。That is, the gist of the present invention resides in a polyester film for magnetic recording tape, characterized in that it satisfies the following formulas [1] to [3] at the same time.
Ｒ５く ５ ・・・・・・・・・ ■Ｓ３゜
≦０．０６ Ｆｓ −０，４・・・・・・・・・ ０
３０分間処理後のフィルムの熱収縮率（％）を示し、Ｆ
Ｓはフィルムの縦方向の５％伸張時強度（ｋｇ／ｍｍ”
）を示し、ｎｕｌｌはフィルム縦方向の屈折率を示し
１．ｎはフィルムの平均屈折率を示す。）以下、本発明
の詳細な説明する。R5ku 5 ・・・・・・・・・ ■S3゜ ≦0.06 Fs -0,4・・・・・・・・・ 0
The heat shrinkage rate (%) of the film after treatment for 30 minutes is shown, and F
S is the strength at 5% elongation in the longitudinal direction of the film (kg/mm”
), and null indicates the refractive index in the longitudinal direction of the film.1. n indicates the average refractive index of the film. ) Hereinafter, the present invention will be explained in detail.
本発明にいうポリエステルとは、テレフタル酸、イソフ
タル酸、ナフタレン−２，６−ジカルボン酸のような芳
香族ジカルボン酸又はそのエステルと、エチレングリコ
ール、ジエチレングリコール、テトラメチレングリコー
ル、ネオペンチルグリコール等のようなグリコールとを
重縮合させて得ることのできるポリマーである。かかる
ポリエステルは、芳香族ジカルボン酸とグリコールとを
直接重縮合させて得られる他、芳香族ジカルボン酸ジア
ルキルエステルとグリコールとをエステル交換反応させ
た後、重縮合させる方法、または芳香族ジカルボン酸の
ジグリコールエステルを重縮合させる方法によって得る
ことができる。The polyester referred to in the present invention refers to aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, and naphthalene-2,6-dicarboxylic acid or their esters, and ethylene glycol, diethylene glycol, tetramethylene glycol, neopentyl glycol, etc. It is a polymer that can be obtained by polycondensation with glycol. Such polyesters can be obtained by direct polycondensation of aromatic dicarboxylic acids and glycols, or by polycondensation after transesterification of aromatic dicarboxylic acid dialkyl esters and glycols, or by polycondensation of aromatic dicarboxylic acid dialkyl esters and glycols. It can be obtained by a method of polycondensing glycol esters.
かかるポリマーの代表的なものとして、ポリエチレンテ
レフタレートやポリエチレン−２，６−ナフタレンジカ
ルボキシレート等が例示される。Typical examples of such polymers include polyethylene terephthalate and polyethylene-2,6-naphthalene dicarboxylate.
本発明のポリエステルはホモポリマーであってもよく、
またその特性を低下させない範囲、例えばジカルボン酸
成分の１５モル％以下が主成分の芳香族ジカルボン酸以
外のジカルボン酸成分またはジオール成分の１５モル％
以下が主成分ジオール以外のジオール成分であるような
共重合ポリエステルであってもよい。The polyester of the present invention may be a homopolymer,
In addition, within a range that does not deteriorate its properties, for example, 15 mol% or less of the dicarboxylic acid component is 15 mol% of the dicarboxylic acid component other than the aromatic dicarboxylic acid as the main component or the diol component.
A copolymerized polyester having the following diol components other than the main component diol may be used.
更に前記ポリエステルと、他の重合体とのポリマーブレ
ンドであってもよい。ブレンド出来る他の重合体として
は、ポリアミド、ポリオレフィン、ポリカーボネート、
他種ポリエステル等が挙げられる。また、ポリエステル
フィルムに易滑性を付与するために、微粒子を添加して
もよい、かかる微粒子としては、カリオン、クレー、炭
酸カルシウム、酸化ケイ素、テレフタル酸カルシウム、
酸化アルミニウム、球状シリカ、酸化チタン等の不活性
外部粒子、ポリエステル樹脂の溶融製膜に際して不溶な
高融点有機化合物、架橋ポリマー及びポリエステル合成
時に使用するアルカリ金属化合物、アルカリ土類金属化
合物等の金属化合物触媒によってポリエステル製造時に
ポリマー内部に形成される内部粒子の中から適宜選択さ
れる。当然各校子を単独で用いてもよいし、併用しても
よい。Furthermore, it may be a polymer blend of the polyester and another polymer. Other polymers that can be blended include polyamides, polyolefins, polycarbonates,
Examples include other types of polyester. Further, fine particles may be added to impart slipperiness to the polyester film. Examples of such fine particles include carrion, clay, calcium carbonate, silicon oxide, calcium terephthalate,
Inert external particles such as aluminum oxide, spherical silica, titanium oxide, etc., high melting point organic compounds that are insoluble during melt film formation of polyester resin, metal compounds such as alkali metal compounds and alkaline earth metal compounds used during crosslinked polymer and polyester synthesis. The catalyst is appropriately selected from internal particles formed inside the polymer during polyester production by the catalyst. Of course, each student may be used alone or in combination.
フィルム中に含まれる微粒子量は、通常０．００５〜１
．５重量％の範囲であり、粒子の平均粒径は通常、０．
０１〜５μｍの範囲である。The amount of fine particles contained in the film is usually 0.005 to 1
．． 5% by weight, and the average particle size of the particles is typically 0.5% by weight.
The range is 0.01 to 5 μm.
また、本発明におけるポリエステルは、必要に応じて、
安定剤、着色剤、酸化防止剤、消泡剤等の添加剤を含有
するものであってもよい。In addition, the polyester in the present invention may include, if necessary,
It may contain additives such as stabilizers, colorants, antioxidants, and antifoaming agents.
以上詳述したポリエステルを用いて本発明のフィルムを
得ることができるが、得られたフィルムの縦方向５ｍに
おける厚さ斑Ｒ５は５％未満でなければならない。フィ
ルムの厚さ斑が５％以上ではテープ走行時の蛇行、巻き
乱れの他、電磁変換特性にも悪影響を与える。かかる厚
さ斑は３％以下が好ましい。The film of the present invention can be obtained using the polyester detailed above, but the thickness unevenness R5 of the obtained film in the longitudinal direction of 5 m must be less than 5%. If the thickness unevenness of the film is 5% or more, it causes meandering and irregular winding during tape running, and also adversely affects electromagnetic conversion characteristics. Such thickness unevenness is preferably 3% or less.
また本発明のフィルムの縦方向の５％伸張時強［Ｆ、値
と１００℃、３０分間処理後の熱収縮率Ｓ、。 ≦ ０
．０６ ＦＳ −０，４・・・・・・・・・ ■こ
の０式を満足しないフィルムはスキュー特性、スリット
性、巻き特性（巻きズレ）、及びテープダメージ等で劣
り磁気テープ用として不適当である。Further, the strength [F, value] of the film of the present invention at 5% elongation in the longitudinal direction and the heat shrinkage rate S, after treatment at 100° C. for 30 minutes. ≦ 0
．． 06 FS -0,4・・・・・・・・・ ■Films that do not satisfy this formula 0 have poor skew characteristics, slitting characteristics, winding characteristics (wrapping misalignment), tape damage, etc., and are unsuitable for use in magnetic tapes. be.
なお、通常、磁気テープ用として用いられるフィルムの
Ｆｓ（ａは１２ ｋｇ／ｍｍ２以上であり、好ましくは
１３ ｋｇ／ｍｍ”以上、長時間記録用では１５ｋｇ／
ｍｍ”以上であり、好ましくは１９ ｋｇ／ｎｏ＋＋２
以未満であり、好ましくは０．８％以下、更に好ましく
は０．６％以下である。フィルムの熱収縮率は小さい程
、スキュー改良効果が優れ、磁気テープ用として有用で
ある。Note that the Fs (a) of films used for magnetic tapes is usually 12 kg/mm2 or more, preferably 13 kg/mm or more, and 15 kg/mm for long-term recording.
mm” or more, preferably 19 kg/no++2
It is preferably 0.8% or less, more preferably 0.6% or less. The smaller the heat shrinkage rate of the film, the better the skew improvement effect, and the more useful it is for magnetic tapes.
更に本発明のフィルムの縦方向の５％伸張時強度Ｆ５、
縦方向の屈折率ｎＨＤおよび平均屈折率Ｔが下記０式を
満足することが必要である。Furthermore, the strength F5 at 5% elongation in the longitudinal direction of the film of the present invention,
It is necessary that the longitudinal refractive index nHD and the average refractive index T satisfy the following formula 0.
・・・轡
この■式を満足しないフィルムは生産性が劣り、コスト
アップとなるため好ましくない。...Films that do not satisfy the formula (2) are undesirable because they have poor productivity and increase costs.
以上の要件を同時に満足するフィルムが磁気テープ用と
して有用であるが、更に下記０〜０式を満足するフィル
ムが磁気テープ用フィルムとして特に優れた特性を有す
る。A film that satisfies the above requirements at the same time is useful as a magnetic tape, but a film that also satisfies the following formulas 0 to 0 has particularly excellent properties as a magnetic tape film.
０．００２ ・Ｆｓ＋１．４３ ・ｎ ２．１７≦Δ
Ｐ≦０．００２ ・Ｐｓ＋ １．４３ ・ｎ ２−１
５ ・・・・・” ■ｎ≧０．０００５・Ｆｓ＋１
．５９４０ ・・・・・・−・−００式を満足し
ないフィルム、例えば面配向度ΔＰが０．００２・ＦＳ
＋１．４３・ｎ−２，１７未満となるフィルムはスリ
ット性に劣り、ΔＰが０．００２・Ｆｓ ＋１．４３ｎ
２．１５を超えるフィルムでは電気特性、走行性お
よび生産性について劣ったものとなる。また０式を満足
しないフィルム、すなわち平均屈折率ｎが０．０００５
・Ｆ−ｓ＋１．５９４０未満のフィルムはスキュー特
性が劣る。ｎが０．０００６・Ｆ、＋１．５９２８以上
であるフィルムが更にスキュー特性の点で優れる。0.002 ・Fs+1.43 ・n 2.17≦Δ
P≦0.002 ・Ps+ 1.43 ・n 2-1
5 ・・・・・・” ■n≧0.0005・Fs+1
．． 5940 ......--A film that does not satisfy the -00 formula, for example, a plane orientation degree ΔP of 0.002・FS
A film with a value less than +1.43・n−2,17 has poor slitting properties, and ΔP is 0.002・Fs +1.43n
Films with a molecular weight exceeding 2.15 have poor electrical properties, runnability, and productivity. Also, films that do not satisfy formula 0, that is, the average refractive index n is 0.0005.
-Films with less than F-s+1.5940 have poor skew characteristics. A film in which n is 0.0006·F, +1.5928 or more is even better in terms of skew characteristics.
また、フィルム表面の粗度（Ｒａ ）は通常０６００５
〜０．０５μｍの範囲であることが望ましい。In addition, the roughness (Ra) of the film surface is usually 06005
A range of 0.05 μm is desirable.
ＲａがＯ，ＯＯ５μｍ未満では巻き特性の点で劣り、０
．００５μｍを超えると磁気記録性が極めて悪化し好ま
しくない。If Ra is less than O,OO5μm, the winding characteristics will be poor, and 0
．． If it exceeds 0.005 μm, magnetic recording properties will deteriorate significantly, which is not preferable.
以上述べたように弐［１］〜［３］を同時に満足するフ
ィルム、好ましくは式■〜■を同時に満足するフィルム
が磁気テープ用途における高品質化、薄膜化、高画質化
に適応できるフィルムである。As mentioned above, a film that satisfies 2 [1] to [3] at the same time, preferably a film that satisfies formulas 2 to 3 at the same time, is a film that can be adapted to higher quality, thinner film, and higher image quality in magnetic tape applications. be.
次に本発明のポリエステルフィルムの製膜方法を更に詳
細に説明する。Next, the method for forming a polyester film of the present invention will be explained in more detail.
カオリン、シリカ、炭酸カルシウム、酸化アルミニウム
等の微細粒子及び安定剤、着色剤、消泡剤、有機滑剤、
ポリアルキレングリコール等の添加剤を必要に応じ含有
するポリエステルチップを常法の手段で乾燥し、押出機
を通して押出し、回転冷却ドラム上で冷却固化して未延
伸ポリエステルシートを形成する。この際、常法の静電
印加冷却法を用いるのが好適である。このようにして得
た実質的に非晶状態のフィルムを延伸倍率（λｔ）４．
０〜９．０の範囲内で縦方向に延伸し次いで横力向に延
伸倍率３．２倍以上で延伸し二軸配向フィルムを形成す
る。Fine particles such as kaolin, silica, calcium carbonate, aluminum oxide, stabilizers, colorants, antifoaming agents, organic lubricants,
The polyester chips, optionally containing additives such as polyalkylene glycol, are dried by conventional means, extruded through an extruder, and solidified by cooling on a rotating cooling drum to form an unstretched polyester sheet. At this time, it is preferable to use a conventional electrostatic application cooling method. The substantially amorphous film thus obtained was stretched at a stretching ratio (λt) of 4.
The film is stretched in the machine direction within a range of 0 to 9.0, and then stretched in the transverse direction at a stretching ratio of 3.2 times or more to form a biaxially oriented film.
本発明のフィルムを製造するに際し７ては、前記縦方向
の延伸が、
（Ａ）非晶状態のフィルムを延伸倍率１．２〜４．０倍
で複屈折率がｌＸｌ０−’〜２．５Ｘ１０−”となるよ
うに１段または多段で縦延伸し、
（Ｂ）フィルム温度をガラス転移点以下に冷却すること
なく、延伸倍率１．１〜３．５倍で複屈折率が３．０Ｘ
１０−”〜８．０ｘｌＯ−２となるように１段または多
段で縦延伸し、
（Ｃ）フィルム温度をガラス転移点以下に冷却した後、
（Ｄ）フィルムをガラス転移点以上に加熱して１段また
は多段で縦延伸する工程からなることが好ましい。In manufacturing the film of the present invention, in step 7, the stretching in the longitudinal direction is performed so that (A) the film in an amorphous state has a birefringence of 1X10-' to 2.5X10 at a stretching magnification of 1.2 to 4.0 times. (B) Without cooling the film temperature below the glass transition point, the birefringence is 3.0X at a stretching ratio of 1.1 to 3.5 times.
(C) After cooling the film temperature to below the glass transition point, (D) After heating the film to above the glass transition point, It is preferable to include a step of longitudinal stretching in one stage or in multiple stages.
また、横延伸後の二軸配向フィルムに必要に応じて再度
線及び／又は横延伸を行なってもよいが、横延伸後、直
ちに熱固定することが好ましい。その際の熱固定温度は
少なくとも２００℃以上であリ、好ましくは２１０°Ｃ
以上である。Further, the biaxially oriented film after the transverse stretching may be subjected to line and/or transverse stretching again if necessary, but it is preferable to heat set immediately after the transverse stretching. The heat setting temperature at that time is at least 200°C or higher, preferably 210°C.
That's all.
以上述べたように本発明のフィルムは、磁気テープ用フ
ィルムとして極めて優れたものであり、通常、その厚み
は３〜１５μｍの範囲である。As described above, the film of the present invention is extremely excellent as a film for magnetic tape, and its thickness is usually in the range of 3 to 15 μm.
以下、実施例にて、本発明を更に具体的に説明するが、
本発明は、その要旨を超えない限り以下の実施例に限定
されるものでない。Hereinafter, the present invention will be explained in more detail with reference to Examples.
The present invention is not limited to the following examples unless it exceeds the gist thereof.
なお、フィルム及びテープの特性評価方法は次の通りで
ある。The characteristics of the film and tape were evaluated as follows.
（１） Ｆｓ値
■インテスコ製、引張試験機インナスコモデル２００１
型を用いて、温度２３℃、湿度５０％ＲＨに調節された
室内においてフィルムの縦方向に切り出した長さ５０鰭
、幅１５１璽の試料フィルムを長手方向に５０ ｕ＋／
ｍｉｎの速度で引張り、５％伸張時の強度をＦ、値とし
た。(1) Fs value ■ Tensile tester Innasco Model 2001 manufactured by Intesco
A sample film with a length of 50 fins and a width of 151 fins was cut out in the longitudinal direction using a mold in a room controlled at a temperature of 23°C and a humidity of 50% RH.
It was pulled at a speed of min, and the strength at 5% elongation was taken as the value F.
無張力状態で１００℃雰囲気中３０分間、熱処理しその
前後のサンプルの長さを測定することにより次式にて計
算した。The length of the sample was calculated by the following formula by heat-treating it in a 100°C atmosphere for 30 minutes in a tension-free state and measuring the length of the sample before and after the heat treatment.
熱収縮率（％）−
（３）厚さ斑Ｒ’ （％）
安置電気社製連続フィルム厚さ測定器（電子マイクロメ
ーター使用）により、二輪延伸フィルムの縦方向に沿っ
て測定し、（５ｍ長さについて）次式より算出した。Thermal shrinkage rate (%) - (3) Thickness unevenness R' (%) Measured along the longitudinal direction of the two-wheel stretched film using a continuous film thickness measuring device manufactured by Anki Electric Co., Ltd. (using an electronic micrometer). Regarding length) Calculated from the following formula.
（４） ｎｓｍ
アタゴ光学社製 アツベ式屈折計を用いて、２３℃にて
ナトリウムＤ線に対するフィルム縦方向の屈折率を測定
した。(4) nsm The refractive index of the film in the longitudinal direction with respect to the sodium D line was measured at 23° C. using an Atsube refractometer manufactured by Atago Optical Co., Ltd.
（５） 平均屈折率Ｔ、面配向度ΔＰアタゴ光学社製
アフベ式屈折計を用い、フィルム面内の屈折率の最大値
ｎ ｒ ｓそれに直角の方向の屈折率ｎβ、及びフィル
ムの厚さ方向の屈折率ｎαを測定し、次式より平均屈折
率及び面配向度を算出した。尚、屈折率の測定は、ナト
リウムＤ線を用い、２３度で行なった。(5) Average refractive index T, degree of plane orientation ΔP Using an Afbe refractometer manufactured by Atago Optical Co., Ltd., the maximum value of the refractive index in the film plane n r s, the refractive index nβ in the direction perpendicular to it, and the thickness direction of the film The refractive index nα was measured, and the average refractive index and degree of plane orientation were calculated from the following formula. Note that the refractive index was measured using sodium D line at 23 degrees.
ｎ ＝Ｉ八 （ｎα＋ｎβ＋ｎγ）
（６）摩擦係数（μｄ）
固定した硬質クロムメツキ金属ロール（直径６龍）にフ
ィルムを巻きつけ角１３５°（θ）で接触させ、５３
ｇ （Ｔｚ）の荷重を一端にかけて、１ｍ／ｍｉｎの速
度でこれを走行させ他端の抵抗力（Ｔ ＋（ｇ））を測
定し、次式により走行中の摩擦係数（μｄ）を求めた。n = I8 (nα + nβ + nγ) (6) Coefficient of friction (μd) A film was wound around a fixed hard chrome plated metal roll (diameter 6 mm) and brought into contact at an angle of 135° (θ), 53
A load of g (Tz) was applied to one end, and it was run at a speed of 1 m/min to measure the resistance force (T + (g)) at the other end, and the coefficient of friction (μd) during running was determined using the following formula. .
（７）表面粗度（Ｒａ） 中心線平均粗さＲａ（μｍ）をもって表面粗さとした。(7) Surface roughness (Ra) The center line average roughness Ra (μm) was defined as the surface roughness.
■小板研究所社製表面粗さ測定機（ＳＥ−３Ｆ）を用い
て次のようにして求めた。すなわち、フィルム断面曲線
からその中心線の方向に基準長さＬ（２，５ｆｌ）の部
分を抜き取り、この抜き取り部分の中心線をＸ軸、縦倍
率の方向をｙ軸として粗さ曲線ｙ−ｒ （ｘ）で表わ
したとき、次の式で与えられた値を〔μｍ〕で表わす、
中心線平均粗さは、試料フィルム表面から１０本の断面
曲線を求め、これらの断面曲線から求めた抜き取り部分
の中心線平均粗さの平均値で表わした。尚、触針の先端
半径は２μｍ、荷重は３０■とし、カットオフは０．０
８鶴とした。■It was determined as follows using a surface roughness measuring machine (SE-3F) manufactured by Koita Research Institute. That is, a part with a reference length L (2,5 fl) is extracted from the film cross-sectional curve in the direction of its center line, and the roughness curve yr is set with the center line of this extracted part as the X axis and the vertical magnification direction as the y axis. When expressed as (x), the value given by the following formula is expressed in [μm],
The centerline average roughness was determined by determining 10 cross-sectional curves from the surface of the sample film, and was expressed as the average value of the centerline average roughness of the sampled portions determined from these cross-sectional curves. The tip radius of the stylus is 2 μm, the load is 30μ, and the cutoff is 0.0.
8 cranes.
（８）磁気テープ特性（磁気記録用媒体の特性）まず、
次に示す磁性塗料をポリエステルフィルムに塗布し、乾
燥後の膜厚を５μｍとなるよう磁性層を形成した。すな
わち、磁性微粉末２００部、ポリウレタン樹脂３０部、
ニトロセルロース１０部、塩酢ビ共重合体１０部、レシ
チン５部、シクロへキサノン１００部およびメチルエチ
ルケトン３００部をボールミルにて４８時間混合分散後
ポリイソシアネート化合物５部を加えて磁性塗料とし、
これをポリエステルフィルムに塗布した後、塗料が充分
乾燥固化する前に磁気配向させ、その後乾燥した。更に
、この塗布フィルムをスーパーカレンダーにて表面処理
を施し、２インチ幅にスリットしてビデオテープとした
。このビデオテープを松下電気側製ＮＶ−３７００型ビ
デオデツキにより常連にて下記の磁気テープ特性を評価
した。ＶＴＲヘッド出力はシンクロスコープにより測定
周波数４メガヘルツにおけるＶＴＲヘッド出力を測定し
、基準テープを０．０デシベル（ｄ Ｂ）とし、その相
対値を（ｄ Ｂ）表示した。(8) Magnetic tape characteristics (characteristics of magnetic recording media) First,
The following magnetic paint was applied to a polyester film to form a magnetic layer so that the film thickness after drying was 5 μm. That is, 200 parts of magnetic fine powder, 30 parts of polyurethane resin,
After mixing and dispersing 10 parts of nitrocellulose, 10 parts of salt-vinyl acetate copolymer, 5 parts of lecithin, 100 parts of cyclohexanone and 300 parts of methyl ethyl ketone in a ball mill for 48 hours, 5 parts of a polyisocyanate compound was added to prepare a magnetic paint.
After applying this to a polyester film, it was magnetically oriented before the paint was sufficiently dried and solidified, and then dried. Furthermore, this coated film was subjected to surface treatment using a supercalender, and was slit into 2-inch widths to make a videotape. The following magnetic tape characteristics of this videotape were evaluated using an NV-3700 video deck manufactured by Matsushita Electric. The VTR head output was measured using a synchroscope at a measurement frequency of 4 MHz, and the reference tape was set to 0.0 decibel (dB), and its relative value was expressed as (dB).
（ｉ） スキュー量
クロマのビデオ信号を記録したビデオテープを再生し、
シバツク社製カラーモニター〇ＭＭ２０−１１にて遅延
掃引操作を行ない、画面上の歪み量をメジャーで読み取
り、モニター画面全幅の比をもって１水平走査時間に換
算し測定した結果、良好なものをＯ２全く不良のものを
×、その中間のものを△とした。(i) Play back a videotape on which a video signal with a skew amount chroma is recorded,
Performing a delayed sweep operation on a Shibatsu color monitor MM20-11, reading the amount of distortion on the screen with a tape measure, and converting it into one horizontal scanning time using the ratio of the full width of the monitor screen. Bad ones were rated as ×, and those in the middle were rated as △.
（ｉｉ） 耐エツジダメージ性
市販の家庭用ＶＴＲを用いて２００回走行後、テープ端
部のひだ状の伸びを目視で評価した。(ii) Edge damage resistance After running the tape 200 times using a commercially available home VTR, the elongation of the folds at the ends of the tape was visually evaluated.
ランクＡ 全く伸びが認められない ランクＢ わずかではあるが伸びが認められる。Rank A: No growth observed at all Rank B: Although slight, growth is recognized.
ランクＣはっきりひだ状の伸びが認められ、実用上使用
し難い。Rank C: Clear pleat-like elongation is observed, making it difficult to use practically.
（ｉｉｉ ） スリット性
磁気テープをスリットしたときのスリット部分の断面を
電子顕微鏡で観察し、断面に切り粉が残り磁性面が盛り
上がっているものは×、全く良好なものは○、中間のも
のを△とした。(iii) Observe the cross section of the slit part when slitting the slit magnetic tape with an electron microscope. If the cross section has chips remaining on the cross section and the magnetic surface is raised, it is ×, if it is completely good, it is ○, if it is in the middle, it is It was marked △.
（ｉｖ） 磁気テープの巻き特性
磁気テープを早送りで巻いたとき、テープの端面が不ぞ
ろいのものを×、全く良好なものをＯｌその中間を△と
した。(iv) Winding Characteristics of Magnetic Tape When a magnetic tape was wound in fast forward motion, a case where the end surface of the tape was uneven was marked as "x", a case where it was perfectly good was marked as "O", and a mark in between was marked as "fair".
実施例１
ポリエチレンテレフタレートチップ（固有粘度０．６０
、平均粒径０．０２μｍのＡｊ！ｚＯｓ０．３重量％と
平均粒径０．７μｍの炭酸カルシウム０．３重量％とを
重合時添加したもの）を１８０℃で５時間乾燥後、２８
５℃でＴダイからシート状にて押出し、４５℃に保たれ
た回転ドラム上で冷却固化して幅３５０Ｄの未延伸非晶
質フィルムを得た。その際、公知の静電密着法を用いた
。得られた非晶質フィルムを多段のニップロールの周速
差を利用して、まず縦方向に第１段目としてフィルム温
度１１２°Ｃで１．６倍延伸後、連続して縦方向に第２
段目としてフィルム温度１４３℃で２．８倍延伸した。Example 1 Polyethylene terephthalate chip (intrinsic viscosity 0.60
, Aj with an average particle size of 0.02 μm! After drying at 180°C for 5 hours, 28
It was extruded in a sheet form from a T-die at 5°C and cooled and solidified on a rotating drum kept at 45°C to obtain an unstretched amorphous film with a width of 350D. At that time, a known electrostatic adhesion method was used. The obtained amorphous film was first stretched 1.6 times in the longitudinal direction at a film temperature of 112°C in the first stage by utilizing the peripheral speed difference between the multi-stage nip rolls, and then continuously stretched in the second stage in the longitudinal direction.
As a step, the film was stretched 2.8 times at a film temperature of 143°C.
なお、第１段目の延伸後のフィルムの複屈折率は３．０
Ｘ１０−’であり、第２段目の延伸後のフィルムの複屈
折率は３．８Ｘ１０−”であった。かくして得られたフ
ィルムを一端４０℃に冷却した後、更にフィルム温度９
ｓ℃まで加熱し、１．２２倍で第３段口の縦延伸を行な
った。得られた縦延伸フィルムの複屈折率は０．０６０
であった。The birefringence index of the film after the first stage stretching is 3.0.
X10-', and the birefringence of the film after the second stage stretching was 3.8X10-'. After cooling the film thus obtained at one end to 40°C, the film temperature was further increased to 9.
It was heated to s° C. and longitudinally stretched at the third stage at a magnification of 1.22 times. The birefringence of the obtained longitudinally stretched film was 0.060.
Met.
次にテンター内で１１０℃で横方向に３−８倍延伸し、
更に２２５℃で緊張熱固定を行なって厚さ１５μｍのフ
ィルムを得た。Next, it was stretched 3-8 times in the transverse direction at 110°C in a tenter.
Further, tension heat setting was performed at 225° C. to obtain a film with a thickness of 15 μm.
比較例工
第３段目の縦延伸倍率を１．０１倍とする他は実施例と
同様にして厚さ１５μｍのフィルムを得た。Comparative Example Process A film with a thickness of 15 μm was obtained in the same manner as in the example except that the longitudinal stretching ratio in the third stage was 1.01 times.
なお、第３段目の縦延伸後の複屈折率は０．０４２であ
った。Note that the birefringence index after the third stage longitudinal stretching was 0.042.
実施例２．３
第３段目の縦延伸温度を３８℃と低くして、かつ延伸倍
率を１．３倍（実施例２）及び１．５倍（実施例３）と
する以外は、実施例１と同様にして製膜し厚さ１５μｍ
のフィルムを得た。Example 2.3 The same procedure was carried out except that the longitudinal stretching temperature in the third stage was as low as 38°C and the stretching ratio was 1.3 times (Example 2) and 1.5 times (Example 3). A film was formed in the same manner as Example 1 to a thickness of 15 μm.
I got a film of.
第３段目の縦延伸後のフィルムの複屈折率はそれぞれ０
．０８３（実施例２）、０．１０２（実施例３）であっ
た。The birefringence of the film after the third stage of longitudinal stretching is 0.
．． 083 (Example 2) and 0.102 (Example 3).
比較例２
実施例２において熱固定温度を１９５℃とする以外は実
施例２と同等にして厚さ１５μｍのフィルムを得た。Comparative Example 2 A film with a thickness of 15 μm was obtained in the same manner as in Example 2 except that the heat setting temperature was 195° C.
比較例３
実施例１において、第３段目の縦延伸を行なわずに、第
１段目及び第２段目の延伸倍率を各々２゜０倍、３．６
倍とする以外は、実施例１と同様にして厚さ１５μｍの
フィルムを得た。しかしながら縦延伸での破膜が多く、
長尺のフィルムを採取することは困難であった。Comparative Example 3 In Example 1, the third stage longitudinal stretching was not performed, and the first and second stage stretching ratios were 2°0 times and 3.6 times, respectively.
A film with a thickness of 15 μm was obtained in the same manner as in Example 1 except that the size was doubled. However, there are many cases of membrane rupture during longitudinal stretching;
It was difficult to collect long films.
比較例４
実施例１における未延伸フィルムを縦方向に８３℃で３
．０倍延伸した後、−旦冷却して更に７９℃で１．３倍
、１００℃で３．８倍延伸し、２２５℃で熱固定して厚
さ１５μｍのフィルムを得た。Comparative Example 4 The unstretched film in Example 1 was stretched in the longitudinal direction at 83°C for 3
．． After stretching 0 times, it was cooled once, further stretched 1.3 times at 79°C, 3.8 times at 100°C, and heat set at 225°C to obtain a film with a thickness of 15 μm.
以上得られた結果をまとめて表１に示す。The results obtained above are summarized in Table 1.
本発明の磁気テープ用ポリエステルフィルムは、優れた
機械的特性、熱的特性、厚さ斑、走行性、ＴＬ磁変換特
性を有しており、その工業的価値は高い。The polyester film for magnetic tape of the present invention has excellent mechanical properties, thermal properties, thickness unevenness, runnability, and TL magnetic conversion properties, and has high industrial value.
出 願 人applicant
Claims (1)
徴とする磁気記録テープ用ポリエステルフィルム。 Ｒ＾５＜５・・・・・・・・・［１］ Ｓ＾１＾０＾０＿３＿０≦０．０６Ｆ＿５−０．４・・
・・・・・・・［２］ ▲数式、化学式、表等があります▼・・・［３］ （但し上記式中、Ｒ＾５はフィルムの縦方向５ｍにおけ
る厚さ斑（％）を示し、Ｓ＿３＿０は１００℃で３０分
間処理後のフィルムの熱収縮率（％）を示し、Ｆ＿５は
フィルムの縦方向の５％伸張時強度（ｋｇ／ｍｍ＾２）
を示し、ｎ＿Ｍ＿Ｐはフィルム縦方向の屈折率を示し、
＠ｎ＠はフィルムの平均屈折率を示す。）(1) A polyester film for magnetic recording tape, characterized in that it satisfies the following formulas [1] to [3] at the same time. R^5<5...[1] S^1^0^0_3_0≦0.06F_5-0.4...
・・・・・・・・・［2］ ▲There are mathematical formulas, chemical formulas, tables, etc.▼・・・［3］ (However, in the above formula, R^5 indicates the thickness unevenness (%) in the vertical direction of the film of 5 m. , S_3_0 indicates the heat shrinkage rate (%) of the film after being treated at 100°C for 30 minutes, and F_5 is the strength at 5% stretching in the longitudinal direction of the film (kg/mm^2)
, n_M_P indicates the refractive index in the longitudinal direction of the film,
@n@ indicates the average refractive index of the film. )
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32001388A JPH02165413A (en) | 1988-12-19 | 1988-12-19 | Polyester film for magnetic recording tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32001388A JPH02165413A (en) | 1988-12-19 | 1988-12-19 | Polyester film for magnetic recording tape |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02165413A true JPH02165413A (en) | 1990-06-26 |
Family
ID=18116777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32001388A Pending JPH02165413A (en) | 1988-12-19 | 1988-12-19 | Polyester film for magnetic recording tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02165413A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6147235A (en) * | 1984-08-15 | 1986-03-07 | Diafoil Co Ltd | Manufacturing method of polyester film |
| JPS61167532A (en) * | 1985-01-21 | 1986-07-29 | Toray Ind Inc | Biaxially oriented polyester film for magnetic recording medium |
| JPS61209155A (en) * | 1985-03-13 | 1986-09-17 | ダイアホイルヘキスト株式会社 | Composite film |
| JPS61237623A (en) * | 1985-04-15 | 1986-10-22 | Diafoil Co Ltd | Polyester film for magnetic tape |
-
1988
- 1988-12-19 JP JP32001388A patent/JPH02165413A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6147235A (en) * | 1984-08-15 | 1986-03-07 | Diafoil Co Ltd | Manufacturing method of polyester film |
| JPS61167532A (en) * | 1985-01-21 | 1986-07-29 | Toray Ind Inc | Biaxially oriented polyester film for magnetic recording medium |
| JPS61209155A (en) * | 1985-03-13 | 1986-09-17 | ダイアホイルヘキスト株式会社 | Composite film |
| JPS61237623A (en) * | 1985-04-15 | 1986-10-22 | Diafoil Co Ltd | Polyester film for magnetic tape |
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