JPH0132574B2 - - Google Patents
Info
- Publication number
- JPH0132574B2 JPH0132574B2 JP57022374A JP2237482A JPH0132574B2 JP H0132574 B2 JPH0132574 B2 JP H0132574B2 JP 57022374 A JP57022374 A JP 57022374A JP 2237482 A JP2237482 A JP 2237482A JP H0132574 B2 JPH0132574 B2 JP H0132574B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- parts
- powder
- paint
- fluorinated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000003973 paint Substances 0.000 claims description 12
- 239000011230 binding agent Substances 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 7
- 229920001228 polyisocyanate Polymers 0.000 claims description 6
- 239000005056 polyisocyanate Substances 0.000 claims description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 229920001451 polypropylene glycol Polymers 0.000 claims description 4
- 238000006664 bond formation reaction Methods 0.000 claims 1
- 229920005862 polyol Polymers 0.000 description 15
- 150000003077 polyols Chemical class 0.000 description 15
- 239000006247 magnetic powder Substances 0.000 description 13
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000843 powder Substances 0.000 description 9
- -1 fatty acid ester Chemical class 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 3
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 3
- 239000008199 coating composition Substances 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 238000003682 fluorination reaction Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 2
- MIZLGWKEZAPEFJ-UHFFFAOYSA-N 1,1,2-trifluoroethene Chemical group FC=C(F)F MIZLGWKEZAPEFJ-UHFFFAOYSA-N 0.000 description 1
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- JZQOJFLIJNRDHK-CMDGGOBGSA-N alpha-irone Chemical compound CC1CC=C(C)C(\C=C\C(C)=O)C1(C)C JZQOJFLIJNRDHK-CMDGGOBGSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 229940090961 chromium dioxide Drugs 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 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
- 239000006185 dispersion Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical compound FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003921 oil 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
- 239000000123 paper Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 150000003673 urethanes Chemical class 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/702—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent
- G11B5/7021—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent containing a polyurethane or a polyisocyanate
- G11B5/7022—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent containing a polyurethane or a polyisocyanate containing mixtures of polyurethanes or polyisocyanates with other polymers
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
本発明は磁気テープ、磁気シート、磁気デイス
ク等の磁気記録媒体に関し、更に詳しくは改善さ
れた耐摩耗性の磁性層を有し耐久性に優れた磁気
記録媒体に関する。
磁気記録媒体は、記録および再生時に磁気ヘツ
ドと大きな相対速度で摺接するため、磁性層が摩
耗し易く、従つて磁性層の耐摩耗性の向上が要求
されている。
このような要求に応えるため、従来、モース硬
度約６以上の非磁性物質粉末、例えば酸化クロム
粉末、α−酸化鉄粉末、酸化アルミニウム粉末、
炭化ケイ素粉末等を磁性層中に混入すること、滑
剤、例えばシリコーンオイル、脂肪酸エステル、
流動パラフイン、固型パラフイン、フツ素化オイ
ル、脂肪酸アミド、脂肪酸等を磁性層中に混入す
ること、等が提案されてきている。
しかし、非磁性物質粉末を磁性層中に混入する
場合には、磁性層の耐久性の向上は達成されるも
のの、磁性層をなす塗膜が硬質になり過ぎて基体
（例：ベースフイルム）に対する接着性が低下し
たり、磁気ヘツド等の対接物の摩耗を引き起こし
易い欠点がある。他方、前記例示のシリコーンオ
イル等の滑剤を磁性層に混入する場合、ある程度
の耐久性の向上が認められるが、充分に満足でき
る耐久性の向上を達成するには至らない。
本発明者等は、従来のこのような磁性層の耐摩
耗性向上手段の欠点を除くべく鋭意検討した結
果、磁気記録媒体の製造に際してバインダーとし
てフツ素化されたポリプロピレングリコールまた
はフルオロ炭化水素を分子中に含むポリプロピレ
ングリコール（以下「フツ素化されたポリオー
ル」と称することがある）を用いることにより、
磁性層の耐摩耗性の顕著な向上が達成され、基体
に対する磁性層の接着性が損われず、しかも磁気
ヘラツド等の対接物の有害な摩耗を引き起こさな
い磁性層が得られることを見出し、本発明を完成
するに至つた。すなわち、本発明は磁性粉末をバ
インダーで結合させてなる磁性層を基体上に設け
てなる磁気記録媒体において、フツ素化されたポ
リオールからなるバインダーを用いたことを特徴
とする磁気記録媒体に存する。
従来、ポリオールそのものは、磁性粉を良好に
分散させ、またイソシアネートと反応してウレタ
ン結合を形成し、基体との良好な密着性を示すこ
とから、ウレタン系バインダーの形で磁気記録媒
体の製造に用いられてきたが、かかるウレタン系
バインダーを用いた場合には得られる磁性塗膜の
強度が低く、摩擦係数が大きく、磁気記録媒体と
して要求される耐摩耗性に欠ける。従つてそのよ
うなウレタン系バインダーに、前記の如き非磁性
物質粉末および／または滑剤を混入して磁性塗膜
の耐摩耗性を向上させなければならず、そのよう
な混入により引き起こされる前記問題を甘受しな
ければならなかつた。
ところが、本発明者等の知見によれば、フツ素
化されたポリオールからなるバインダーを用いた
磁性塗料においてはポリオール本来の磁性粉の良
好な分散性が損われず、そのような磁性塗料から
得られる磁性層（塗膜）の摩擦係数が著しく低く
なり、また基体に対する密着性もよい。さらに
は、上記磁性塗料にポリイソシアネートを配合し
て、塗膜（磁性層）形成の際にフツ素化ポリオー
ルとポリイソシアネートとを反応させてウレタン
結合を生じさせることにより、塗膜と基体との密
着性が一層向上し、改善された耐摩耗性を有する
高耐久性の磁気記録媒体が得られる。本発明の磁
性層は、従来の非磁性物質粉末を混入した磁性層
の場合に見られた磁気ヘツド等の対接物の著しい
摩耗を、引き起こさない。
本発明で使用するフツ素化されたポリオールの
フツ素含有量は、５〜60％が適当であり、15〜40
％が好ましい。フツ素含有量が５％より少ない
と、磁性層の耐摩性の向上が不充分であり、逆に
フツ素含有量が60％を越えると磁性粉との混和性
が悪く、磁性粉の良好な分散が達成されず、満足
すべき磁性塗料の調合が困難になる。
なお、フツ素化されたポリオールの分子中に含
まれるフルオロ炭化水素としては、テトラフルオ
ロエチレン、トリフルオロエチレン、フツ化ビニ
ル、フツ化ビニリデンが挙げられるが、特にテト
ラフルオロエチレンが好ましい。
フツ素化されたポリオールは、バインダーとし
て単独で用いることも、あるいはさらに他のバイ
ンダー、例えば塩化ビニル／酢酸ビニル共重合
体、ポリウレタン、エポキシ樹脂、アクリル酸樹
脂、セルロース系樹脂、アクリル酸エステル／ア
クリロニトリル共重合体、アクリル酸エステル樹
脂、ポリエステル、ポリ酢酸ビニルおよびゴム系
の一種またはそれ以上と併用することもできる。
本発明に使用するのに適当な市販のフツ素化ポ
リオール製品の例としては、東亜ペイント株式会
社製の「Ｘ−1109」（フツ素化度約25％）、「Ｘ−
1109−120」（フツ素化度約35％）、「Ｘ−1109−
400」（フツ素化度約15％）、等がある。
本発明の磁気記録媒体の製造に用いられる磁性
粉末は、公知のいずれの磁性粉末であつてもよ
く、例えば磁性酸化鉄粉末（Fe3O4、γ−Fe2O3
またはこれらをCo、Mn、Ni、Mo、Bi等でドー
プしたもの）、二酸化クロム粉、その他の金属磁
性粉等である。
本発明の磁気記録媒体の基体（ベース）は、慣
用の材料、例えばポリエステル、セルロースアセ
テート、ポリイミド、ポリアミド、紙等のフイル
ムまたはシートであつてよい。
本発明の磁気記録媒体には、磁気テープ、磁気
シート、磁気カード、磁気デイスク、磁気ドラム
等の種々の記録媒体が包含される。
以下の実施例は、本発明を磁気テープに応用し
た場合を例示するものである。それぞれの結果を
表１および２に示す。
実施例 １
下記組成の磁性塗料を用いた。
Co含有針状γ−酸化鉄 100部
フツ素化ポリオール* 25部
ポリイソシアネート ５部
分散剤 ３部
MIBK 100部
トルエン 100部
（＊東亜ペイント株式会社製 トアガーメツトＸ
−1109）
上記成分をボールミル中で分散混練して磁性塗
料を作り、この塗料を14μｍ厚のポリエステルフ
イルム上に、乾燥後の厚さが4μｍになる様に塗
布し、乾燥し、カレンダー処理した後、50℃で
100時間熱処理した。このフイルムを所定の幅に
裁断してビデオ用磁気テープを得た。
実施例 ２
実施例１と同様な操作により下記組成の磁性塗
料を作り、またビデオ用磁気テープを得た。
Co含有針状γ−酸化鉄 100部
フツ素化ポリオール* 15部
塩化ビニル／酢酸ビニル共重合体** 10部
ポリイソシアネート ５部
分散剤 ３部
MIBK 100部
トルエン 100部
（＊東亜ペイント株式会社製 トアガーメツトＸ
−1109−120）
（＊＊UCC社製 VAGH）
比較例 １
実施例２の磁性塗料組成のうちのフツ素化ポリ
オールの代りにポリオール（日本ウレタン株式会
社製ニツポラン5033）を用い、実施例２の操作に
よりビデオ用磁気テープを得た。
実施例 ３
実施例１の磁性塗料組成中のCo含有γ−酸化
鉄の代りに鉄系合金磁性粉（関東電化工業株式会
社製）を使用し、実施例１の操作によりオーデイ
オ用磁気テープを得た。
実施例 ４
実施例１の操作により下記組成の磁性塗料を調
合し、そしてオーデイオ用磁気テープを得た。
磁性鉄合金粉* 100部
フツ素化ポリオール** 15部
塩化ビニル／酢酸ビニル共重合体*** 10部
ポリイソシアネート ５部
分散剤 ３部
MIBK 100部
トルエン 100部
（＊関東電化工業株式会社製）
（＊＊東亜ペイント株式会社製 トアガーメツト
Ｘ−1109−400）
（＊＊＊UCC社製 VAGH）
比較例 ２
実施例４の磁性塗料組成中のフツ素化ポリオー
ルの代りにポリオール（比較例１で使用のもの）
を用いて、実施例４の操作によりオーデイオ用磁
気テープを得た。
以上の実施例および比較例で得たビデオ用磁気
テープおよびオーデイオ用磁気テープの特性を、
表１および表２にそれぞれまとめて示す。
これらの表から、本発明の磁気記録媒体は、比
較例のものに比べ、ビデオ特性、出力変動に関し
ての性能が優れ、耐摩耗性が著しく向上している
ことが判る。
比較例 ３
比較例１の磁性塗料組成にさらにポリテトラフ
ルオロエチレン粉末（ルブロンL2；喜多村製）
を５部添加し、比較例１の操作によりビデオ用磁
気テープを得た。このテープの特性は表１の通り
で、耐久性は向上しているが、感度とＳ／Ｎが低
下している。
比較例 ４
比較例２の磁性塗料にさらにポリテトラフルオ
ロエチレン粉末（比較例３で使用したものと同じ
もの）を５部添加し、オーデイオ用磁気テープを
得た。このテープの特性は表２の通りであり、感
度及びＳ／Ｎが低下している。
The present invention relates to magnetic recording media such as magnetic tapes, magnetic sheets, and magnetic disks, and more particularly to magnetic recording media that have a magnetic layer with improved wear resistance and excellent durability. Since a magnetic recording medium comes into sliding contact with a magnetic head at a high relative speed during recording and reproduction, the magnetic layer is likely to wear out, and therefore there is a demand for improvement in the wear resistance of the magnetic layer. In order to meet such demands, conventionally, non-magnetic powders with a Mohs hardness of about 6 or higher, such as chromium oxide powder, α-iron oxide powder, aluminum oxide powder,
Mixing silicon carbide powder etc. into the magnetic layer, lubricant such as silicone oil, fatty acid ester, etc.
It has been proposed to mix liquid paraffin, solid paraffin, fluorinated oil, fatty acid amide, fatty acid, etc. into the magnetic layer. However, when non-magnetic powder is mixed into the magnetic layer, although the durability of the magnetic layer is improved, the coating film forming the magnetic layer becomes too hard and does not adhere to the substrate (e.g. base film). It has the disadvantage that adhesion is reduced and it tends to cause abrasion of the object it contacts, such as a magnetic head. On the other hand, when a lubricant such as the above-mentioned silicone oil is mixed into the magnetic layer, durability is improved to some extent, but a sufficiently satisfactory improvement in durability cannot be achieved. As a result of intensive studies to eliminate the shortcomings of conventional means for improving the wear resistance of magnetic layers, the present inventors have discovered that fluorinated polypropylene glycol or fluorohydrocarbon molecules can be used as a binder during the manufacture of magnetic recording media. By using polypropylene glycol (hereinafter sometimes referred to as "fluorinated polyol") contained in
It has been discovered that a remarkable improvement in the abrasion resistance of the magnetic layer can be achieved, that the adhesion of the magnetic layer to the substrate is not impaired, and that a magnetic layer can be obtained that does not cause harmful abrasion of objects in contact with it, such as magnetic healds, The present invention has now been completed. That is, the present invention resides in a magnetic recording medium comprising a magnetic layer formed by bonding magnetic powder with a binder on a substrate, characterized in that a binder made of a fluorinated polyol is used. . Traditionally, polyol itself has been used in the production of magnetic recording media in the form of a urethane binder because it disperses magnetic powder well, reacts with isocyanate to form urethane bonds, and exhibits good adhesion to the substrate. However, when such a urethane-based binder is used, the strength of the magnetic coating film obtained is low, the coefficient of friction is large, and the wear resistance required for a magnetic recording medium is lacking. Therefore, it is necessary to mix the above-mentioned non-magnetic material powder and/or lubricant into such a urethane-based binder to improve the wear resistance of the magnetic coating film, and to solve the above-mentioned problems caused by such mixing. I had to accept it. However, according to the findings of the present inventors, in a magnetic paint using a binder made of a fluorinated polyol, the good dispersibility of the magnetic powder inherent to the polyol is not impaired, and the magnetic powder obtained from such a magnetic paint is The friction coefficient of the magnetic layer (coating film) is significantly lowered, and the adhesion to the substrate is also good. Furthermore, by blending polyisocyanate into the above-mentioned magnetic paint and causing the fluorinated polyol and polyisocyanate to react to form a urethane bond during the formation of the paint film (magnetic layer), the paint film and the substrate can be bonded. A highly durable magnetic recording medium with improved adhesion and improved wear resistance can be obtained. The magnetic layer of the present invention does not cause significant abrasion of the object to which it contacts, such as a magnetic head, as has been the case with conventional magnetic layers mixed with non-magnetic powder. The fluorine content of the fluorinated polyol used in the present invention is suitably 5 to 60%, and 15 to 40%.
% is preferred. If the fluorine content is less than 5%, the wear resistance of the magnetic layer will not be improved sufficiently, and on the other hand, if the fluorine content exceeds 60%, the miscibility with the magnetic powder will be poor, and the magnetic powder will not have good properties. Dispersion is not achieved, making it difficult to formulate satisfactory magnetic coatings. Note that examples of the fluorohydrocarbon contained in the molecule of the fluorinated polyol include tetrafluoroethylene, trifluoroethylene, vinyl fluoride, and vinylidene fluoride, and tetrafluoroethylene is particularly preferred. Fluorinated polyols can be used alone as binders or in addition with other binders, such as vinyl chloride/vinyl acetate copolymers, polyurethanes, epoxy resins, acrylic resins, cellulosic resins, acrylic esters/acrylonitrile. It can also be used in combination with one or more of copolymers, acrylic ester resins, polyesters, polyvinyl acetate and rubber systems. Examples of commercially available fluorinated polyol products suitable for use in the present invention include "X-1109" (approximately 25% fluorination), manufactured by Toa Paint Co., Ltd.;
1109-120" (degree of fluorination approximately 35%), "X-1109-
400'' (degree of fluorination approximately 15%), etc. The magnetic powder used for manufacturing the magnetic recording medium of the present invention may be any known magnetic powder, such as magnetic iron oxide powder (Fe 3 O 4 , γ-Fe 2 O 3
or doped with Co, Mn, Ni, Mo, Bi, etc.), chromium dioxide powder, and other metal magnetic powders. The base of the magnetic recording medium of the present invention may be a conventional material, such as a film or sheet of polyester, cellulose acetate, polyimide, polyamide, paper, etc. The magnetic recording medium of the present invention includes various recording media such as magnetic tape, magnetic sheet, magnetic card, magnetic disk, and magnetic drum. The following examples illustrate the application of the present invention to magnetic tapes. The respective results are shown in Tables 1 and 2. Example 1 A magnetic paint having the following composition was used. Co-containing acicular γ-iron oxide 100 parts Fluorinated polyol * 25 parts Polyisocyanate 5 parts Dispersant 3 parts MIBK 100 parts Toluene 100 parts (* Toa Paint Co., Ltd. Togarmet X
-1109) The above ingredients are dispersed and kneaded in a ball mill to make a magnetic paint, and this paint is applied onto a 14 μm thick polyester film to a dry thickness of 4 μm, dried, and calendered. , at 50℃
Heat treated for 100 hours. This film was cut into a predetermined width to obtain a video magnetic tape. Example 2 A magnetic paint having the following composition was prepared in the same manner as in Example 1, and a video magnetic tape was also obtained. Co-containing acicular γ-iron oxide 100 parts Fluorinated polyol * 15 parts Vinyl chloride/vinyl acetate copolymer ** 10 parts Polyisocyanate 5 parts Dispersant 3 parts MIBK 100 parts Toluene 100 parts (Toa Garmet Co., Ltd.) X
-1109-120) (**VAGH manufactured by UCC) Comparative Example 1 Polyol (Nitsuporan 5033 manufactured by Nippon Urethane Co., Ltd.) was used in place of the fluorinated polyol in the magnetic coating composition of Example 2, and A video magnetic tape was obtained by the operation. Example 3 An audio magnetic tape was obtained by the procedure of Example 1, using iron-based alloy magnetic powder (manufactured by Kanto Denka Kogyo Co., Ltd.) in place of the Co-containing γ-iron oxide in the magnetic coating composition of Example 1. Ta. Example 4 A magnetic paint having the following composition was prepared according to the procedure of Example 1, and an audio magnetic tape was obtained. Magnetic iron alloy powder * 100 parts Fluorinated polyol ** 15 parts Vinyl chloride/vinyl acetate copolymer *** 10 parts Polyisocyanate 5 parts Dispersant 3 parts MIBK 100 parts Toluene 100 parts (*manufactured by Kanto Denka Kogyo Co., Ltd.) (** TOA GARMET )
An audio magnetic tape was obtained by the operation of Example 4. The characteristics of the video magnetic tape and audio magnetic tape obtained in the above examples and comparative examples are as follows:
They are summarized in Tables 1 and 2, respectively. From these tables, it can be seen that the magnetic recording medium of the present invention has superior performance in terms of video characteristics and output fluctuations, and has significantly improved wear resistance compared to the comparative example. Comparative Example 3 In addition to the magnetic coating composition of Comparative Example 1, polytetrafluoroethylene powder (Luburon L2; manufactured by Kitamura) was added.
5 parts of were added, and a video magnetic tape was obtained by the operation of Comparative Example 1. The characteristics of this tape are shown in Table 1, showing improved durability but decreased sensitivity and S/N. Comparative Example 4 5 parts of polytetrafluoroethylene powder (same as that used in Comparative Example 3) was further added to the magnetic paint of Comparative Example 2 to obtain an audio magnetic tape. The characteristics of this tape are shown in Table 2, and the sensitivity and S/N are decreased.
【表】【table】
Claims (1)
たはフルオロ炭化水素を分子中に含むポリプロピ
レングリコールであつて、そのフツ素含量が５〜
60重量％であるものからなるバインダー及びポリ
イソシアネートを含む磁性塗料を基体上に担持
し、両成分のウレタン結合形成反応により硬化し
てなる磁気記録媒体。1 Fluorinated polypropylene glycol or polypropylene glycol containing a fluorohydrocarbon in the molecule, the fluorine content of which is 5 to 5.
A magnetic recording medium in which a magnetic paint containing a binder and polyisocyanate in an amount of 60% by weight is supported on a substrate, and is cured by a urethane bond-forming reaction between the two components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2237482A JPS58141438A (en) | 1982-02-15 | 1982-02-15 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2237482A JPS58141438A (en) | 1982-02-15 | 1982-02-15 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58141438A JPS58141438A (en) | 1983-08-22 |
| JPH0132574B2 true JPH0132574B2 (en) | 1989-07-06 |
Family
ID=12080858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2237482A Granted JPS58141438A (en) | 1982-02-15 | 1982-02-15 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58141438A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51123112A (en) * | 1975-04-18 | 1976-10-27 | Hitachi Maxell Ltd | Magnetic recording medium |
-
1982
- 1982-02-15 JP JP2237482A patent/JPS58141438A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51123112A (en) * | 1975-04-18 | 1976-10-27 | Hitachi Maxell Ltd | Magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58141438A (en) | 1983-08-22 |
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