JPH01248314A - Video tape - Google Patents
Video tapeInfo
- Publication number
- JPH01248314A JPH01248314A JP63074211A JP7421188A JPH01248314A JP H01248314 A JPH01248314 A JP H01248314A JP 63074211 A JP63074211 A JP 63074211A JP 7421188 A JP7421188 A JP 7421188A JP H01248314 A JPH01248314 A JP H01248314A
- Authority
- JP
- Japan
- Prior art keywords
- height
- average
- videotape
- tape
- meandering
- 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
- 239000000314 lubricant Substances 0.000 claims abstract description 12
- 238000012546 transfer Methods 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims description 32
- 229920000728 polyester Polymers 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 description 23
- 239000010408 film Substances 0.000 description 18
- 238000005299 abrasion Methods 0.000 description 13
- 229920006267 polyester film Polymers 0.000 description 10
- 239000008188 pellet Substances 0.000 description 9
- 238000005259 measurement Methods 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 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 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000011156 evaluation 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
- 239000007788 liquid Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000006068 polycondensation reaction Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005809 transesterification reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 241000512259 Ascophyllum nodosum Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 241001248531 Euchloe <genus> Species 0.000 description 1
- 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 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229940090961 chromium dioxide Drugs 0.000 description 1
- IAQWMWUKBQPOIY-UHFFFAOYSA-N chromium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Cr+4] IAQWMWUKBQPOIY-UHFFFAOYSA-N 0.000 description 1
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium(IV) oxide Inorganic materials O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004956 cyclohexylene group Chemical group 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- NZZFYRREKKOMAT-UHFFFAOYSA-N diiodomethane Chemical compound ICI NZZFYRREKKOMAT-UHFFFAOYSA-N 0.000 description 1
- 238000005315 distribution function Methods 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000012760 heat stabilizer Substances 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
- 239000006247 magnetic powder Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000006259 organic additive Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 235000012771 pancakes Nutrition 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【発明の詳細な説明】 [産業上の利用分野] 本発明は、ビデオテープに関するものである。[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD This invention relates to videotapes.
[従来の技術]
ビデオテープとしては、ポリエステルフィルムに磁性層
を設けてなるビデオテープが知られている(例えば、特
開昭59−203228号公報等)。[Prior Art] As a video tape, a video tape made of a polyester film provided with a magnetic layer is known (for example, Japanese Patent Application Laid-Open No. 59-203228, etc.).
[発明か解決しようとする課題]
しかしながら、」1記従来のビデオテープではテープの
加工工程や高速ダビング(記録の複写)時、特にV10
ローダ−等を用いてパンケーキからビデオカセットとす
る際に非磁性面が削られることにより白粉が生じる。ま
たテープ走行時に蛇行が生じゃずいという問題があった
。本発明はかかる課題を解決し、白粉が発生しにくい、
耐摩耗性と蛇行しにくいという蛇行性に優れたビデオテ
ープを提供することを目的とする。[Problem to be solved by the invention] However, "1. In the conventional videotape, during the tape processing process and high-speed dubbing (copying of records), especially V10
When converting pancakes into video cassettes using a loader or the like, the non-magnetic surface is scraped off, producing white powder. There was also the problem that meandering was difficult when the tape ran. The present invention solves this problem and reduces the generation of white powder.
The purpose of the present invention is to provide a videotape with excellent abrasion resistance and meandering properties such as resistance to meandering.
[課題を解決するための手段]
本発明は、ポリエステルと不活性粒子からなる組成物を
主成分とするフィルムの片面に塗布型磁性層を設けてな
るビデオテープであって、該テープの非磁性面について
、高さが80nm以下の突起数が6000個/mm2以
上、突起の高さ平均値りか30〜70nm、平均値!〕
と突起高さの標準偏差σの比σ/1〕が1−14以下で
、かつ滑剤転写係数が0゜07〜0.15であることを
特徴とするビデオテープである。[Means for Solving the Problems] The present invention provides a videotape comprising a coated magnetic layer on one side of a film mainly composed of a composition consisting of polyester and inert particles, the tape having a non-magnetic Regarding the surface, the number of protrusions with a height of 80 nm or less is 6000 or more / mm2, the average height of the protrusions is 30 to 70 nm, the average value! ]
The videotape is characterized in that the ratio σ/1 of the standard deviation σ of the projection height and the standard deviation σ of the protrusion height is 1-14 or less, and the lubricant transfer coefficient is 0°07 to 0.15.
本発明を偶成するベースフィルムに用いるポリエステル
とは、エチレンテレフタレート、エチレンα、β−ビス
(2−クロロフェノキシ)エタン−4,4“−ジカルホ
゛キシレート、エチレン−2,6−ナフタレート単位か
ら選ばれた、少なくとも一種の構造単位を主要構成成分
とする。但し、本発明を阻害しない範囲内、好ましくは
15モル%以内であれば他成分が共重合されていてもよ
い。また、エチレンテレフタレートを主要構成成分とす
るポリエステルの場合に、耐摩耗性がより一層良好とな
るので特に望ましい。The polyester used in the base film of the present invention is selected from ethylene terephthalate, ethylene α, β-bis(2-chlorophenoxy)ethane-4,4″-dicarboxylate, and ethylene-2,6-naphthalate units. In addition, at least one structural unit is the main component.However, other components may be copolymerized within a range that does not impede the present invention, preferably within 15 mol%.In addition, ethylene terephthalate may be the main component. In the case of polyester as a constituent component, it is particularly desirable because the abrasion resistance becomes even better.
本発明のビデオテープの非磁性面における表面突起は、
ポリエステル中に含有される粒子に起因する。粒子とし
ては、ポリエステルに対し不活性なものであればその種
類は特に限定されないがコロイダルシリカ、炭酸カルシ
ウム、α−アルミナ、ルチル型の二酸化チタン、サーマ
ルタイプのカーボンブラックが望ましい。またその表面
は、表面改質がなされていてもよい。粒子形状としては
球形のものが特に望ましい。さらに、粒子を添加する方
法だけでなくポリエステルの合成時に、重合系内で粒子
を析出せしめる内部粒子析出法も用いることができる。The surface protrusions on the non-magnetic surface of the videotape of the present invention are
This is due to the particles contained in the polyester. The type of particles is not particularly limited as long as they are inert to polyester, but colloidal silica, calcium carbonate, α-alumina, rutile type titanium dioxide, and thermal type carbon black are preferable. Moreover, the surface may be surface-modified. A spherical particle shape is particularly desirable. Furthermore, in addition to the method of adding particles, it is also possible to use an internal particle precipitation method in which particles are precipitated within the polymerization system during polyester synthesis.
粒子の平均粒径は特に限定されないが、平均粒径0.1
〜1.0μmのシリカ、カーボンブラック、0.2〜1
.2μmの炭酸カルシウム、酸化チタンの場合に蛇行性
、耐摩耗性がより一層良好となるので望ましい。本発明
の粒子の添加量は0゜1〜1.5重量%の場合に本発明
の表面パラメータを得るのに有効である。The average particle size of the particles is not particularly limited, but the average particle size is 0.1
~1.0 μm silica, carbon black, 0.2-1
.. Calcium carbonate or titanium oxide with a thickness of 2 μm is preferable because the meandering properties and abrasion resistance are even better. The amount of the particles of the present invention added is 0.1 to 1.5% by weight, which is effective for obtaining the surface parameters of the present invention.
本発明に用いるポリエステルフィルムは、上記組成物を
主要成分とするが、本発明の目的を阻害しない範囲内で
、他種ポリマをブレンドしてもよいし、また酸化防止剤
、熱安定剤、紫外線吸収剤、核生成剤等の無機または有
機添加剤が、通常添加される程度添加されていてもよい
。The polyester film used in the present invention has the above composition as a main component, but other polymers may be blended within the range that does not impede the purpose of the present invention, and antioxidants, heat stabilizers, ultraviolet rays, etc. Inorganic or organic additives such as absorbents, nucleating agents, etc. may be added to the extent that they are normally added.
本発明に用いる磁性層の磁性粉の種類は特に限定されな
いが、酸化物系、特に、γ−酸化鉄、CO含含有−酸化
鉄、二酸化クロムの場合に、耐摩耗性がより一層良好と
なるので特に望ましい。バインダーの種類は特に限定さ
れないが、塩化ビニル/酢酸ビニル共重合体、ポリビニ
ルブチラール、ポリウレタンが添加されている場合に蛇
行性、耐摩耗性がより一層良好となるので特に望ましい
。The type of magnetic powder used in the magnetic layer used in the present invention is not particularly limited, but wear resistance is even better when using oxides, especially γ-iron oxide, CO-containing iron oxide, and chromium dioxide. Therefore, it is particularly desirable. The type of binder is not particularly limited, but it is particularly desirable to add vinyl chloride/vinyl acetate copolymer, polyvinyl butyral, or polyurethane, since the meandering properties and abrasion resistance will be even better.
本発明に用いる磁性層の有機滑剤の種類は特に限定され
ないが、炭素数が5〜35の脂肪酸またはその誘導体が
望ましく、特に炭素数が7〜30の脂肪酸またはその誘
導体の場合に蛇行性、耐摩耗性がより一層良好となるの
で特に望ましい。その有機滑剤の添加量は、磁性粉の0
.5〜15重量%、特に1〜10重量%の場合に蛇行性
、耐摩耗性がより一層良好となるので特に望ましい。The type of organic lubricant for the magnetic layer used in the present invention is not particularly limited, but fatty acids having 5 to 35 carbon atoms or derivatives thereof are preferable. This is particularly desirable since the abrasion resistance is even better. The amount of organic lubricant added is 0.
.. A content of 5 to 15% by weight, particularly 1 to 10% by weight, is particularly desirable because meandering properties and abrasion resistance become even better.
磁性層とベースフィルムであるポリエステルフィルムの
厚さ構成は特に限定されないが、磁性層の厚さが3〜7
μm、ポリエステルフィルムの厚さが10〜20μmの
場合に、蛇行性、耐摩耗性がより一層良好となるので特
に望ましい。The thickness structure of the magnetic layer and the polyester film that is the base film is not particularly limited, but the thickness of the magnetic layer is 3 to 7 mm.
When the thickness of the polyester film is 10 to 20 μm, it is particularly desirable because the meandering property and abrasion resistance become even better.
本発明のビデオテープは、非磁性面に微細な突起を有し
ている。該表面突起について、高さが8onm以下の突
起数が6000個/mm2以上、好ましくは8000個
/mm2以上であることが必要である。高さが3QQj
Q以下の突起数が6000個、/H2未満であると耐摩
耗性が不良となるので好ましくない。高さか8 Ora
m以下の突起数の上限は特に限定されないが、100.
000個/mm2程度が製造上の限界であろう。The videotape of the present invention has minute protrusions on the non-magnetic surface. Regarding the surface protrusions, it is necessary that the number of protrusions having a height of 8 onm or less is at least 6000/mm2, preferably at least 8000/mm2. Height is 3QQj
If the number of protrusions below Q is 6000 or less than /H2, the wear resistance will be poor, which is not preferable. Height: 8 Ora
The upper limit of the number of protrusions is not particularly limited, but is 100.
000 pieces/mm2 would be the manufacturing limit.
また、突起の高さ平均値りは30〜70nm、好ましく
は40〜65nmであることが必要である。Further, the average height of the protrusions must be 30 to 70 nm, preferably 40 to 65 nm.
突起の高さ平均値りが30nm未満であると耐摩耗性が
不良となり、突起の高さ平均値りが70nmを超えると
蛇行性が不良となるので好ましくない。If the average height of the protrusions is less than 30 nm, the wear resistance will be poor, and if the average height of the protrusions exceeds 70 nm, the meandering property will be poor, which is not preferable.
さらに、突起高さの平均値りと標準偏差σの比σ/1〕
が1.4以下、好ましくは13以下であることが必要で
ある。突起高さの平均値りと標準偏差σの比σ/hが1
.4を超えると耐摩耗性が不良となるので好ましくない
。突起高さの平均値りと標準偏差σの比σ/hの下限は
特に限定されないが]9.0が製造上の限界であろう。Furthermore, the ratio σ/1 of the average value of the protrusion height and the standard deviation σ]
is 1.4 or less, preferably 13 or less. The ratio σ/h of the average value of protrusion height and standard deviation σ is 1
.. If it exceeds 4, the abrasion resistance becomes poor, which is not preferable. The lower limit of the ratio σ/h of the average protrusion height to the standard deviation σ is not particularly limited, but 9.0 is the manufacturing limit.
さらに、滑剤転写係数が0.07〜0.15、好ましく
は008〜0.13であることが必要である。滑剤転写
係数が0.07未溝であると耐摩耗性が不良となり、滑
剤転写係数が0.1.5を超えると蛇行性不良となるの
で好ましくない。Furthermore, it is necessary that the lubricant transfer coefficient is between 0.07 and 0.15, preferably between 008 and 0.13. If the lubricant transfer coefficient is 0.07 and there are no grooves, the wear resistance will be poor, and if the lubricant transfer coefficient exceeds 0.1.5, the meandering property will be poor, which is not preferable.
本発明に用いるポリエステルフィルムは、上記組成物を
二軸配向せしめたフィルムである。無配向あるいは、−
軸配向フィルムでは、摩耗が大きくなるので好ましくな
い。その配向の程度を示す厚さ方向屈折率比は特に限定
されないが、0.935〜0.975、好ましくは、0
.940〜0゜970の範囲である場合が特に望ましい
。The polyester film used in the present invention is a film in which the above composition is biaxially oriented. Non-oriented or -
Axially oriented films are not preferred because they cause increased wear. The refractive index ratio in the thickness direction, which indicates the degree of orientation, is not particularly limited, but is preferably 0.935 to 0.975, preferably 0.
.. A range of 940° to 0°970 is particularly desirable.
本発明のビデオテープの、非磁性面のRz / Ra比
(単位はともにnm)は耐摩耗性及び蛇行防止の観点か
ら、好ましくは4〜20、より好ましくは6〜18、さ
らに好ましくは8〜16である。The Rz/Ra ratio (both units are nm) of the non-magnetic surface of the videotape of the present invention is preferably 4 to 20, more preferably 6 to 18, still more preferably 8 to 8, from the viewpoint of wear resistance and meandering prevention. It is 16.
本発明のビデオテープの、非磁性面のRz(nm)/突
起径(μm)比は、耐摩耗性及び蛇行防止の観点から、
好ましくは12〜90、より好ましくは14〜80、さ
らに好ましくは15〜60である。The Rz (nm)/protrusion diameter (μm) ratio of the non-magnetic surface of the videotape of the present invention is determined from the viewpoint of wear resistance and meandering prevention.
Preferably it is 12-90, more preferably 14-80, still more preferably 15-60.
本発明のビデオテープは、非磁性面のRzが好ましくは
70〜250 nm、さらに好ましくは90〜180n
mである場合に耐摩耗性、蛇行性がより一層良好となる
ので望ましい。In the videotape of the present invention, the Rz of the non-magnetic surface is preferably 70 to 250 nm, more preferably 90 to 180 nm.
m is preferable because the abrasion resistance and meandering properties become even better.
本発明のビデオテープのヤング率は特に限定されないが
、幅方向のヤング率が長手方向のヤング率より50 k
g/mm2以上高い場合に蛇行性がより一層良好となる
ので特に望ましい。The Young's modulus of the videotape of the present invention is not particularly limited, but the Young's modulus in the width direction is 50 k higher than the Young's modulus in the longitudinal direction.
When it is higher than g/mm2, the meandering property becomes even better, so it is particularly desirable.
次に、本発明のビデオテープの製造方法について述べる
。本発明のビデオテープを構成するポリエステルは、直
接エステル化を経る重縮合を行なって、あるいはエステ
ル交換反応を経る重縮合を行なって得られる。粒子をス
ラリーでポリマに添加する方法としては、重合時に添加
する方法を採用できる。粒子の含有量を調節する方法と
して高濃度のマスターペレットを製膜時に稀釈するマス
ターペレット法が好ましい。また、高濃度、好ましくは
1〜5重量%のマスターペレットの固有粘度、共重合成
分を調整して、ΔTcgを70〜100℃の範囲とし、
かつ、該マスターポリマを、実質的に粒子を含有しない
ポリエステルあるいは内部析出粒子を含有するポリエス
テルのペレットで稀釈する時、該マスターポリマのΔT
cgと実質的に粒子を含有しないポリエステルあるいは
内部析出粒子を含有するポリエステルのΔTcgとの差
(マスターポリマのΔTcg−実質的に粒子を含有しな
いポリエステルのΔTcg、または、マスターポリマの
ΔTcg−内部析出粒子を含有するポリエステルのΔT
c g )を2℃以上、好ましくは5℃以上にしてお
くことは、本発明の表面パラメータを満足させるのに極
めて有効である。Next, a method for manufacturing a videotape according to the present invention will be described. The polyester constituting the videotape of the present invention can be obtained by polycondensation via direct esterification or by polycondensation via transesterification. As a method of adding the particles to the polymer in the form of a slurry, a method of adding the particles during polymerization can be adopted. As a method for adjusting the particle content, a master pellet method in which a highly concentrated master pellet is diluted during film formation is preferred. In addition, by adjusting the intrinsic viscosity and copolymerization component of the master pellet with a high concentration, preferably 1 to 5% by weight, ΔTcg is in the range of 70 to 100°C,
and when the master polymer is diluted with pellets of polyester containing substantially no particles or polyester containing internally precipitated particles, the ΔT of the master polymer
cg and the ΔTcg of a polyester substantially free of particles or containing internal precipitated particles (ΔTcg of master polymer - ΔTcg of polyester substantially free of particles, or ΔTcg of master polymer - internal precipitated particles) ΔT of polyester containing
It is extremely effective to keep c g ) at 2° C. or higher, preferably 5° C. or higher in order to satisfy the surface parameters of the present invention.
この場合の共重合成分としてはイソフタル酸成分、シク
ロへキシレンジメタツール成分が好適である。In this case, suitable copolymerization components include an isophthalic acid component and a cyclohexylene dimethazole component.
上記方法で得られた粒子含有ポリエステルのペレットを
十分乾燥した後、溶融押出機に供給し、ペレットが溶解
する温度以上、ポリマが分解する温度以下で、スリット
状のダイからシート状に溶融押出し、冷却固化せしめて
未延伸フィルムを作る。After sufficiently drying the particle-containing polyester pellets obtained by the above method, the pellets are supplied to a melt extruder, and melt-extruded into a sheet through a slit-shaped die at a temperature above the melting temperature of the pellets and below a temperature at which the polymer decomposes. Cool and solidify to make an unstretched film.
次に、この未延伸フィルムを二軸延伸し配向させる。延
伸方法としては、逐次二軸延伸法、または同時二軸延伸
法を用いることができるが、好ましいのは逐次二軸延伸
法である。この場合の延伸条件としては、最初に長手方
向、次に幅方向の延伸を行ない、延伸倍率を3〜5倍で
行なうのがよい。また、延伸温度は、75〜100℃の
範囲が本発明の表面パラメータを得るのに有効である。Next, this unstretched film is biaxially stretched and oriented. As the stretching method, a sequential biaxial stretching method or a simultaneous biaxial stretching method can be used, but the sequential biaxial stretching method is preferable. In this case, the stretching conditions are preferably to first stretch in the longitudinal direction and then in the width direction at a stretching ratio of 3 to 5 times. Furthermore, a stretching temperature in the range of 75 to 100°C is effective for obtaining the surface parameters of the present invention.
次に、延伸フィルムを熱処理するが、その時の熱処理条
件としては、温度180〜230℃、好ましくは190
〜220℃の範囲で、0,5〜60秒間熱処理する方法
が一般的である。Next, the stretched film is heat treated, and the heat treatment conditions at that time include a temperature of 180 to 230°C, preferably 190°C.
A common method is heat treatment in the range of ~220°C for 0.5 to 60 seconds.
次に、このフィルムに所定の磁性層を塗布する。Next, a predetermined magnetic layer is applied to this film.
磁性層を塗布する方法は公知の方法で行なうことができ
るが、グラビアロールで塗布する方法が本発明範囲の表
面パラメータを得るのに有効である。Although the magnetic layer can be applied by any known method, the method of applying with a gravure roll is effective for obtaining surface parameters within the range of the present invention.
塗布後の乾燥工程は、温度を90〜120℃、特に10
0〜115℃に設定するのが本発明の表面パラメータを
得るのに特に好ましい。The drying process after coating is performed at a temperature of 90 to 120°C, especially 10°C.
A setting between 0 and 115°C is particularly preferred for obtaining the surface parameters of the invention.
また、カレンダー工程は、ポリアミドまたはポリエステ
ル等のプラスチックを弾性ロールに用い、25〜90℃
、特に50〜80℃の温度範囲で行なうのが本発明範囲
の表面パラメータを得るのに好ましい。その時、線圧は
150〜2.50kg/cm、また、速度は100〜3
00 m/minの範囲が本発明範囲の表面パラメータ
を得るのに好ましい。さらに、このビデオテープの磁性
層をキュアした後、そのフィルム原反(広幅)をスリッ
トして本発明のビデオテープを得る。In addition, the calendering process uses plastic such as polyamide or polyester as an elastic roll, and
In order to obtain the surface parameters within the range of the present invention, it is particularly preferable to carry out the treatment in a temperature range of 50 to 80°C. At that time, the linear pressure is 150~2.50kg/cm, and the speed is 100~3.
A range of 0.00 m/min is preferred to obtain surface parameters within the range of the present invention. Further, after curing the magnetic layer of this videotape, the original film (wide width) is slit to obtain the videotape of the present invention.
「特性の測定方法並びに効果の評価方法」本発明の特性
値の測定方法、並びに効果の評価方法は次のとおりであ
る。"Method for Measuring Characteristics and Evaluating Effects" The methods for measuring characteristic values and evaluating the effects of the present invention are as follows.
(1) 粒子の平均粒径
粒子をエチレングリコール中または水スラリーとして分
散させ、遠心沈降式粒度分布測定装置(板場製作所製C
APA500)を用いて、体積平均径(μm)を測定し
た。(1) Average particle size of the particles Disperse the particles in ethylene glycol or as a water slurry, and use a centrifugal sedimentation type particle size distribution analyzer (C manufactured by Itaba Seisakusho).
APA500) was used to measure the volume average diameter (μm).
(2)極限粘度
ASTM D1601に従って、0−り四回フェノー
ル中で測定したもので、dl/(IIで表わす。(2) Intrinsic viscosity: Measured in phenol 0-4 times according to ASTM D1601, expressed as dl/(II).
(3)結晶化パラメータ ΔTcg
Tc上ンエルマー社製のDSC(示差走査熱量計)■型
を用いて測定しな。DSCの測定条件は次のとおりであ
る。すなわち、試料10■をDSC装置にセットし、3
00°Cの温度て5分間溶融した後、液体窒素中に急冷
する。この急冷試料を10℃/minで昇温し、ガラス
転移点Tgを検知する。さらに昇温を続け、ガラス状態
からの結晶化発熱ピーク温度をもって冷結晶化温度TC
Cとしな。ここでTccとTgの差(T c c −T
g )を結晶化パラメータΔTcgと定義する。(3) Crystallization Parameter ΔTcg Tc Measured using a DSC (Differential Scanning Calorimeter) type 1 manufactured by Elmer. The DSC measurement conditions are as follows. That is, set sample 10 in the DSC device,
After melting for 5 minutes at a temperature of 00°C, it is rapidly cooled in liquid nitrogen. This rapidly cooled sample is heated at a rate of 10° C./min, and the glass transition point Tg is detected. The temperature continues to rise further, and when the exothermic peak temperature of crystallization from the glass state is reached, the cold crystallization temperature TC is reached.
With C. Here, the difference between Tcc and Tg (T c c - T
g) is defined as the crystallization parameter ΔTcg.
(4)屈折率
ナトリウムD線(589nm)を光源として、アツベ屈
折率計を用いて測定した。マウント液にはヨウ化メチレ
ンを用い、25℃、65%RHにて測定した。(4) Refractive index Measured using an Atsube refractometer using sodium D line (589 nm) as a light source. Methylene iodide was used as the mounting solution, and the measurement was performed at 25° C. and 65% RH.
(5〉 厚さ方向屈折率比
上記の方法で、二軸配向フィルムの厚さ方向の屈折率(
Aとする)および溶融プレス後10℃の水中へ急冷して
作った無配向(アモルファス)フィルムの厚さ方向の屈
折率(Bとする)を測定し、A/Bをもって厚さ方向屈
折率比とした。(5> Thickness direction refractive index ratio By the above method, the thickness direction refractive index (
The refractive index in the thickness direction (denoted as A) and the non-oriented (amorphous) film made by melt-pressing and quenching into 10°C water (denoted as B) are measured, and A/B is the refractive index ratio in the thickness direction. And so.
(6)Ra、Rz
小板研究所製の高精度薄膜段差測定器ET−1−0を用
いて測定しな。条件は下記のとおりであり、20回の測
定の平均値をもって値とした。(6) Ra, Rz Measure using a high-precision thin film step measuring device ET-1-0 manufactured by Koita Research Institute. The conditions were as follows, and the average value of 20 measurements was taken as the value.
・触針先端半径:0.5μm
・触針荷重 :5mg
・測定長 :1mm
・カットオフイ直:0.08mm
なお、Ra、Rzの定義の詳細は、例えば、奈良治部著
「表面粗さの測定・評価法」 (総合技術センター、1
983)に示されているものである。・Stylus tip radius: 0.5μm ・Stylus load: 5mg ・Measurement length: 1mm ・Cut-off straightness: 0.08mm For details on the definitions of Ra and Rz, see, for example, "Measurement of Surface Roughness" by J. Nara.・Evaluation Method” (General Technology Center, 1
983).
(7) ヤング率
J I 5−Z−1702に規定された方法に従って、
インストロンタイプの引張試験機を用いて、25℃、6
5%RHにて測定しな。(7) Young's modulus according to the method specified in J I 5-Z-1702,
Using an Instron type tensile tester, test at 25°C, 6
Measure at 5% RH.
〈8)突起の個数、平均高さ、高さ分布の標準偏差、突
起径
2検出力式の走査型電子顕微鏡(エリオニクス■製ES
M−3200>と断面測定装置(エリオニクス■製PM
S−1’)で、テープ非磁性面の基準面の高さを0とし
て走査したときの高さ測定値を、256階調のグレー値
として画像処理装置(力−ルツァイス■製IBAS20
00)に送り、このグレー値をもとに画像処理装置上に
テープ非磁性面の突起画像を再暢築する。次に、この表
面突起画像で2値化された突起部分のグレー値を突起高
さ(nm)に換算して突起高さを求める。この測定を該
テープ非磁性面1 cmFについて行なった。突起個数
は1mm2に換算したものであり、平均高さは得られた
突起高さを平均した。また突起高さ分布の標準偏差は、
正規分布関数 Nu =AeXp (−h; 2/2
σ2 )(但し、h、 、N、、Aはそれぞれ突起高さ
、高さり、の突起数、定数)から最小二乗法で得られる
σで定義しな。また、突起径は上記で得られる突起径を
1−内で平均して求めた。(8) Number of protrusions, average height, standard deviation of height distribution, protrusion diameter 2-detection power type scanning electron microscope (Elionics ES)
M-3200> and cross-sectional measuring device (PM manufactured by Elionix ■)
S-1'), the height measurement value when scanning with the height of the reference surface of the tape non-magnetic surface as 0 is converted into a 256-level gray value using an image processing device (IBAS20 made by Luzeiss).
00), and an image of the protrusions on the non-magnetic surface of the tape is rebuilt on the image processing device based on this gray value. Next, the gray value of the protrusion portion binarized using this surface protrusion image is converted into a protrusion height (nm) to obtain the protrusion height. This measurement was performed on 1 cmF of the non-magnetic surface of the tape. The number of protrusions was converted to 1 mm2, and the average height was calculated by averaging the obtained protrusion heights. The standard deviation of the protrusion height distribution is given by the normal distribution function Nu = AeXp (-h; 2/2
σ2) (where h, , N, and A are the protrusion height, height, number of protrusions, and constant, respectively), and should be defined as σ obtained by the least squares method. Further, the protrusion diameter was determined by averaging the protrusion diameters obtained above within 1-.
(9) 動摩擦係数μに
標準条件として、20°C相対湿度60%の雰囲気下で
、外径6mmφの固定軸(表面粗度0.2S)に172
インチ幅のテープを角度θ−πradで接触させ、3.
3cm/sの速さで走行させる。入口テンジョンT1を
25gとした時の出口テンションT2を測定し、次式か
ら動摩擦係数(μk)を算出する。(9) As standard conditions for the dynamic friction coefficient μ, 172 mm was applied to a fixed shaft (surface roughness 0.2S) with an outer diameter of 6 mmφ in an atmosphere of 20°C and relative humidity of 60%.
3. Bring inch-wide tape into contact at an angle θ-π rad;
Run at a speed of 3cm/s. The outlet tension T2 is measured when the inlet tension T1 is 25 g, and the dynamic friction coefficient (μk) is calculated from the following equation.
μに−(1/θ)in (T2/T1)−(1/、r
)in (T2/25>(10)滑剤転写係数
上記の方法で測定した動摩擦係数が0.25〜0.35
の範囲で、かつ、Raが10〜25nmであるポリエス
テルフィルムを用意し、動摩擦係数μkを測定する(μ
に1とする)。μ−(1/θ)in (T2/T1)−(1/, r
) in (T2/25>(10) Lubricant transfer coefficient The coefficient of dynamic friction measured by the above method is 0.25 to 0.35
A polyester film having Ra of 10 to 25 nm is prepared, and the coefficient of dynamic friction μk is measured (μ
1).
上記のポリエステルフィルムとビデオープの磁性面を共
巻きして、40℃で24時間放置した後のポリエステル
フィルムの動摩擦係数μkを測定するくμに2とする)
。Co-wound the above polyester film with the magnetic surface of the video rope and leave it at 40°C for 24 hours, then measure the coefficient of dynamic friction μk of the polyester film (μ is set to 2)
.
μに1−μに2をもって滑剤転写係数と定義する。The lubricant transfer coefficient is defined as 1 for μ - 2 for μ.
(11)蛇行性
市販のV I−I S方式VTRを用いて、巻き出し側
のパックテンションをゼロにしてビデオテープを走行さ
ぜ、ヘッドシリンダーの直前のピンでチープ走行状態を
観察した。走行中にテープが規定の走行位置から1mm
以上外れる場合を蛇行性が[不良J、1mm未満で12
0分間以上走行を続けた場合を「良好」と判定した。(11) Meandering Using a commercially available VI-IS system VTR, a videotape was run with the pack tension on the unwinding side set to zero, and cheap running conditions were observed using a pin just before the head cylinder. The tape moves 1mm from the specified running position while running.
If the deviation is more than 1 mm, the meandering property is 1
A case where the vehicle continued to run for 0 minutes or more was judged to be "good".
(12)耐摩耗性
ビデオテープを長さ1.3mで両端を継ぎループとし、
上記の動摩擦係数測定と同条件で、固定軸にテープ非磁
性面を接触させ15時間連連続打させて固定軸上の白粉
発生量を観察した。さらに市販のVH8方式VTRでも
繰り返し走行させ各々の個所に付着した白粉量を観察し
なところ各判定との対応がよくとれた。(12) Abrasion-resistant videotape with a length of 1.3 m and loops joined at both ends.
Under the same conditions as in the measurement of the dynamic friction coefficient described above, the non-magnetic surface of the tape was brought into contact with the fixed shaft and the tape was continuously struck for 15 hours to observe the amount of white powder generated on the fixed shaft. Furthermore, when a commercially available VH8 type VTR was repeatedly run and the amount of white powder adhering to each location was observed, good correspondence was obtained with each judgment.
白粉がほとんど発生せず、ビデオ用途として使用上問題
ない場合「良好」、白粉の発生量が多くビデオ用途への
使用不可能の場合「不良」と判定した。If little white powder was generated and there was no problem in use for video applications, it was determined to be "good", and if a large amount of white powder was generated and it was impossible to use for video applications, it was determined to be "poor".
「実施例」 本発明を実施例、比較例に基づいて説明する。"Example" The present invention will be explained based on Examples and Comparative Examples.
実施例1
粒子として、平均粒径0.3μmの炭酸カルシラムを含
有するエチレングリコールスラリーを調製した。そのス
ラリーを常法によりエステル交換反応を行ない重合して
、粒子を0.6重量%添加した極限粘度0.62のポリ
エチレンテレフタシー1〜ペレツトを得な。このペレッ
トを185℃3時間真空乾燥した後、押出機に供給して
282°Cで溶融押出し、T型口金からシート状に吐出
した。Example 1 An ethylene glycol slurry containing calcium carbonate having an average particle size of 0.3 μm was prepared as particles. The slurry was subjected to transesterification reaction and polymerization in a conventional manner to obtain polyethylene terephthalate pellets having an intrinsic viscosity of 0.62 and containing 0.6% by weight of particles. The pellets were vacuum-dried at 185° C. for 3 hours, then supplied to an extruder, melt-extruded at 282° C., and discharged into a sheet from a T-shaped nozzle.
この溶融シー1へを表面温度40℃の冷却ドラムに巻き
付けて、冷却固化せしめて未延伸フィルムを作った。This molten sheet 1 was wound around a cooling drum with a surface temperature of 40° C., and cooled and solidified to produce an unstretched film.
この未延伸フィルムを長手方向に90°Cで3゜4倍延
伸した。この延伸はロール間の周速差で行ない、延伸速
度の平均は8000%/minであった。この−軸延伸
フィルムをステンタを用いて延伸速度3000%/mi
n、100℃で幅方向に3.6倍延伸した。次いで、こ
のフィルムを冷却することなく、そのまま熱処理ゾーン
へ導き、210℃で3秒間熱固定し、厚さ15μmの二
軸配向ポリエステルフィルムを得た。This unstretched film was stretched 3° to 4 times in the longitudinal direction at 90°C. This stretching was carried out using a difference in circumferential speed between the rolls, and the average stretching speed was 8000%/min. This -axially stretched film was stretched at a stretching speed of 3000%/mi using a stenter.
The film was stretched 3.6 times in the width direction at 100°C. Next, this film was directly introduced into a heat treatment zone without being cooled and heat-set at 210° C. for 3 seconds to obtain a biaxially oriented polyester film with a thickness of 15 μm.
このフィルムに磁性塗料をグラビアロールを用−17〜 いて塗布する。磁性塗料は次のようにして調製した。Apply magnetic paint to this film using a gravure roll -17~ and apply. The magnetic paint was prepared as follows.
・Co含含有−酸化鉄 100部平均粒子サ
イズ 長さ :0,3μm
針状比:]、O/1
抗磁力 1500 0e
・ポリウレタン樹脂 15部・塩化ビニ
ル/酢酸ビニル共重合体 5部・ニトロセルロース樹
脂 5部・酸化アルミ粉末
3部平均粒径 :0.3μm
・カーボンフ゛ラック 〕一部・レシ
チン 2部・メチルエヂルケ
l〜ン 100部・メチルイソブチルケlヘ
ン 100部・1〜ルエン
]−〇〇部・ステアリン酸 8
部上記組成物をボールミルで48時間混合分散した後、
硬化剤(コロネートL)6部を添加して得られた混練物
をフィルターで濾過して磁性塗布液−コ−8−
を準備し、上記ポリエステルフィルム上に塗布、磁場配
向させ、110℃で乾燥し、さらに小型テストカレンダ
ー装置(スチールロール/ナイロンロール、5段)で、
温度70℃、線圧200 kg/cmでカレンダー処理
した後、70℃、48時間でキユアリングし厚さ20μ
mのビデオテープを得た。・Co-containing iron oxide 100 parts Average particle size Length: 0.3 μm Acicular ratio: ], O/1 Coercive force 1500 0e ・Polyurethane resin 15 parts ・Vinyl chloride/vinyl acetate copolymer 5 parts ・Nitrocellulose Resin 5 parts/Aluminum oxide powder
3 parts Average particle size: 0.3 μm ・Carbon flake 1 part ・Lecithin 2 parts ・Methyl ethylene chloride 100 parts ・Methyl isobutyl kelp 100 parts ・1 to luene
]-〇〇parts・Stearic acid 8
After mixing and dispersing the above composition in a ball mill for 48 hours,
The kneaded product obtained by adding 6 parts of a hardening agent (Coronate L) was filtered through a filter to prepare a magnetic coating liquid -Co-8-, which was coated on the above polyester film, oriented in a magnetic field, and dried at 110°C. Furthermore, with a small test calendar device (steel roll/nylon roll, 5 stages),
After calendering at a temperature of 70°C and a linear pressure of 200 kg/cm, it was cured at 70°C for 48 hours to a thickness of 20μ.
A videotape of m was obtained.
実施例2〜3及び比較例1〜6
実施例1の諸条件の中で、添加する粒子の種類、平均粒
径、添加量、及び延伸条件、処理条件を種々変更するこ
とにより、特性の異なるサンプルを作った。これらのビ
デオテープの評価結果をまとめて第1表に示した。第1
表から、テープ非磁性面の表面パラメータが本発明範囲
内の場合は蛇行性、耐摩耗性を両立するビデオテープが
得られるが、そうでない場合は蛇行性、耐摩耗性を両立
するビデオテープが得られないことがわかる。Examples 2 to 3 and Comparative Examples 1 to 6 Among the various conditions of Example 1, by variously changing the type of particles added, average particle size, amount added, stretching conditions, and processing conditions, different characteristics were obtained. I made a sample. The evaluation results of these videotapes are summarized in Table 1. 1st
From the table, it can be seen that if the surface parameters of the non-magnetic surface of the tape are within the range of the present invention, a videotape with both meandering properties and abrasion resistance can be obtained, but if not, a videotape with both meandering properties and abrasion resistance can be obtained. I know that I can't get it.
第1表
[発明の効果]
本発明はテープ非磁性面の表面形態と磁性層の滑剤転写
性の関係を特定範囲としたので蛇行性、耐摩耗性に優れ
、今後のビデオテープ加工工程の高速化にも対応できる
ものであり、また従来テープ鳴き等を重要視するあまり
おろそかになっていた蛇行性についての性能が飛躍的に
向上できたものである。Table 1 [Effects of the Invention] The present invention sets the relationship between the surface morphology of the non-magnetic surface of the tape and the lubricant transferability of the magnetic layer within a specific range, resulting in excellent meandering properties and abrasion resistance, which will enable high-speed processing of video tapes in the future. It is also possible to dramatically improve the meandering performance, which had traditionally been neglected due to emphasis on tape squeal.
Claims (1)
るフィルムの片面に塗布型磁性層を設けてなるビデオテ
ープであつて、該テープの非磁性面について、高さが8
0nm以下の突起数が6000個/mm^2以上、突起
の高さ平均値hが30〜70nm、平均値hと突起高さ
の標準偏差σの比σ/hが1.4以下で、かつ滑剤転写
係数が0.07〜0.15であることを特徴とするビデ
オテープ。A videotape comprising a coated magnetic layer on one side of a film mainly composed of a composition consisting of polyester and inert particles, the non-magnetic side of the tape having a height of 8.
The number of protrusions of 0 nm or less is 6000 pieces/mm^2 or more, the average height h of the protrusions is 30 to 70 nm, the ratio σ/h of the average value h to the standard deviation σ of the protrusion height is 1.4 or less, and A videotape having a lubricant transfer coefficient of 0.07 to 0.15.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63074211A JPH01248314A (en) | 1988-03-28 | 1988-03-28 | Video tape |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63074211A JPH01248314A (en) | 1988-03-28 | 1988-03-28 | Video tape |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01248314A true JPH01248314A (en) | 1989-10-03 |
Family
ID=13540630
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63074211A Pending JPH01248314A (en) | 1988-03-28 | 1988-03-28 | Video tape |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01248314A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61239930A (en) * | 1985-04-17 | 1986-10-25 | Teijin Ltd | Polyester film for magnetic recording |
-
1988
- 1988-03-28 JP JP63074211A patent/JPH01248314A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61239930A (en) * | 1985-04-17 | 1986-10-25 | Teijin Ltd | Polyester film for magnetic recording |
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