JPH0159647B2 - - Google Patents
Info
- Publication number
- JPH0159647B2 JPH0159647B2 JP13496282A JP13496282A JPH0159647B2 JP H0159647 B2 JPH0159647 B2 JP H0159647B2 JP 13496282 A JP13496282 A JP 13496282A JP 13496282 A JP13496282 A JP 13496282A JP H0159647 B2 JPH0159647 B2 JP H0159647B2
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- magnetic recording
- magnetic
- ferromagnetic powder
- binder
- 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
- 230000005291 magnetic effect Effects 0.000 claims description 27
- 239000000843 powder Substances 0.000 claims description 17
- 230000005294 ferromagnetic effect Effects 0.000 claims description 15
- 239000011230 binding agent Substances 0.000 claims description 11
- 229920001577 copolymer Polymers 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000012948 isocyanate Substances 0.000 claims description 5
- 229920001610 polycaprolactone Polymers 0.000 claims description 4
- 239000004632 polycaprolactone Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 150000004985 diamines Chemical class 0.000 claims description 3
- 150000002513 isocyanates Chemical class 0.000 claims description 3
- 229920005862 polyol Polymers 0.000 claims description 3
- 150000003077 polyols Chemical class 0.000 claims description 3
- 238000004132 cross linking Methods 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 239000005056 polyisocyanate Substances 0.000 claims description 2
- 229920001228 polyisocyanate Polymers 0.000 claims description 2
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000007795 chemical reaction product Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920005749 polyurethane resin Polymers 0.000 description 3
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 3
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 2
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 229920006026 co-polymeric resin Polymers 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
- 150000001875 compounds Chemical class 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- -1 isocyanate compounds Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 125000005263 alkylenediamine group Chemical group 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000004986 phenylenediamines Chemical class 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 125000000467 secondary amino group Chemical group [H]N([*:1])[*:2] 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 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
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
この発明は、磁気記録媒体に関するものであ
り、その目的とするところは、強磁性粉末の分散
性に優れる磁気記録媒体を提供することにある。
磁気記録体は、通常、強磁性粉末、結合剤、溶
剤および必要に応じて、他の添加剤からなる磁性
塗料をポリエステルフイルムなどの非磁性基体に
塗着してつくられる。強磁性粉末としては、従来
より用いられている酸化鉄系微粉末、および近
年、その飽和磁化及び保磁力が高いため、磁気記
録密度の向上、再生出力の向上を目的に用いられ
はじめた金属粉末等がある。溶剤としては、トル
エン、メチルエチルケトン（MEK）、メチルイソ
ブチルケトン（MIBK）、イソプロピルアルコー
ル、シクロヘキサノン等の一種又は二種以上の混
合物が一般に用いられる。他の添加剤としては、
分散剤、研磨剤、充填剤、帯電防止剤、防錆剤等
が必要に応じて用いられる。分散剤は強磁性粉末
を被覆して用いる場合もある。結合剤について
は、強磁性粉末の分散性の面で、磁気記録媒体の
特性上、極めて重要な働きを担つている。それ故
強磁性粉末の分散性が良好で磁気記録媒体に高感
度、高SN比などの優れた電磁気特性を付与でき
るものを選定する必要がある。これらの背景から
現在実際に使用されている結合剤の代表として、
塩化ビニル系共重合体樹脂およびポリウレタン系
樹脂の２種類がある。
しかるに塩化ビニル系共重合体樹脂の場合、強
磁性粉末を分散させる能力については比較的優れ
ているがなお充分でない。一方ポリウレタン系樹
脂においては、走向特性並びに耐久性の面では優
れているが、強磁性粉末に対する分散性が劣り、
結果として感度、SN比などの電磁気特性の悪化
をまねいている。
本発明は、従来の樹脂を用いた場合に生ずるこ
れらの欠点を克服するためになされたものであつ
て、分散性が優れた結合剤を含む磁気記録媒体を
提供することを目的とする。
即ち、本発明は、非磁性基体上に強磁性粉末及
び結合剤を含む磁性層を設けた磁気記録媒体にお
いて、該結合剤成分がポリカプロラクトンポリオ
ール、ジアミン及びイソシアネートからなる共重
体をその硬化剤で架橋してなる架橋体を主成分と
するものである。
本発明で使用する共重合体の製造原料である前
記ポリカプロラクトンポリオール（以下「PC」
と略記する。）は分子量及び末端水酸基の数に特
に制約はなく、市販されているものをそのまま使
用することができる。例えばダイヤル社製
Placcel（同社商標）、UCC社製NIAX PCP（同社
商標）などが挙げられる。
前記ジアミン（以下「DI」と略記する。）とし
ては、一級アミノ基を１個もしくは２個有する化
合物又は二級アミノ基を２個有するものであれば
よく、中でもフエニレンジアミン、アルキレンジ
アミンなどが好ましい。
前記イソシアネート（以下「IS」と略記する。）
としては、トリレンジイソシアネート、ジフエニ
ルメタンジイソシアネート、ヘキサメチレンジイ
ソシアネートなど一般的なイソシアネート化合物
を使用することができる。
前記共重合体の製造方法は、具体例を実施例に
示すが、特に限定されるものではなく、溶液重
合、乳化重合等公知の方法を採用することができ
る。
前記共重合体の製造において使用するPC、DA
及びISの割合は、これらの合計量に対してPCが
20〜80重量％、DAが10〜40重量％、ISが10〜40
重量％とするのがよい。
前記共重合体と共に強磁性粉末と混合され、該
共重合体の硬化剤としての役割をもつものとして
は、ポリイソシアネート（以下「PIS」と略記す
る。）とエポキシ樹脂を挙げることができる。硬
化反応が早い点で前者が好ましい。
PISとして、例えばトリメチロールプロパン１
モルとトリレンジイソシアネート３モルとの反応
物である三官能性低分子量イソシアネート化合物
等があげられる。該反応物は、バイエル社からは
商品名「デスモジユールＬ」として、日本ポリウ
レタン工業(株)からは商品名「コロネートＬ」とし
て市販されている。
PISの前記共重合体への混入量は、多すぎると
最終的に得られる塗膜が脆くなり、少な過ぎると
耐溶剤性等に問題が生じるので、該共重合体100
重量部に対し５〜30重量部が適当である。
本発明における前記強磁性粉末としては、特に
限定されず、たとえばγ−Fe2O3、Co−γ−
Fe2O3、CrO2、金属鉄、コバルト、ニツケル、
銅、クロム、けい素等の鉄合金等を挙げることが
できる。
結合剤を溶剤に溶解し、これに強磁性粉末を添
加、混合して分散させれば、磁性塗料を得るが、
結合剤と強磁性粉末の添加順、分散手段等は何ら
限定されない。次に、本発明を実施例につき更に
詳細に説明するが本願発明はこれらに限定される
ものではない。
実施例
撹拌棒、凝縮器、滴下装置、窒素吹込管、温度
計を備えた反応容器を用いる。
まず反応器を50℃に加温し、窒素置換をし、ジ
フエニルメタンジイソシアネートを10重量部およ
び平均分子量1250のポリカプロラクトンジオール
を25重量部添加し、内容物を撹拌しながら窒素雰
囲気下80℃、４時間反応を行なう。反応終了後50
℃まで冷却し、ジメチルフオルムアマイド28重量
部を添加し30分撹拌し、均一に溶解させる。一方
ジメチルフオルムアマイド28重量部にビスアミノ
プロピルピペラジン９重量部を溶解させたものを
調整し、前記反応生成物に添加し撹拌しながら窒
素雰囲気下50℃、２時間反応させ、反応後室温ま
で冷却させる。得られた反応物の樹脂濃度は44重
量パーセントであつた。この反応生成物を用い、
表１に示す如く、硬化剤と共に各種の強磁性粉末
を種々変えた場合の各種配合により、ボールミル
を用い、48時間混合分散し磁性塗料を調整した。
又この塗料を公知の方法にて、厚さ12μのポリエ
ステルフイルム基体上に塗布した後、80℃で30分
乾燥・硬化処理して厚さ4μの磁性層を形成せし
め、巾10mmに裁断して磁気テープを作つた。
比較例
実施例の配合組成物のうち、本発明における結
合剤に代えて、塩化ビニル、酢酸ビニル、ビニル
アルコール共重合体（UCC社製；商品名：
VAGH；樹脂分100％）又はポリウレタン樹脂
（日本ポリウレタン工業(株)製；商品名：ニツポラ
ン2304；樹脂分35重量パーセント）をおのおの使
用した以外は、実施例と全く同様の方法で磁気テ
ープを作製した。
配合表は表２にまとめて示す。但し実施例と対
比する為に結合剤及び溶剤の量を合わせてある。
The present invention relates to a magnetic recording medium, and an object thereof is to provide a magnetic recording medium with excellent dispersibility of ferromagnetic powder. Magnetic recording bodies are usually made by applying a magnetic paint consisting of ferromagnetic powder, a binder, a solvent and, if necessary, other additives, to a non-magnetic substrate such as a polyester film. Examples of ferromagnetic powder include iron oxide fine powder, which has traditionally been used, and metal powder, which has recently begun to be used to improve magnetic recording density and reproduction output due to its high saturation magnetization and coercive force. etc. As the solvent, one or a mixture of two or more of toluene, methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), isopropyl alcohol, cyclohexanone, etc. is generally used. Other additives include
Dispersants, abrasives, fillers, antistatic agents, rust preventives, etc. are used as necessary. The dispersant may be used by coating ferromagnetic powder. The binder plays an extremely important role in terms of the dispersibility of the ferromagnetic powder and the characteristics of the magnetic recording medium. Therefore, it is necessary to select a ferromagnetic powder that has good dispersibility and can impart excellent electromagnetic properties such as high sensitivity and high signal-to-noise ratio to the magnetic recording medium. Based on these backgrounds, as a representative of the binders currently in use,
There are two types: vinyl chloride copolymer resin and polyurethane resin. However, in the case of vinyl chloride copolymer resin, although the ability to disperse ferromagnetic powder is relatively excellent, it is still insufficient. On the other hand, polyurethane resins are excellent in terms of strike characteristics and durability, but have poor dispersibility with ferromagnetic powder.
As a result, electromagnetic characteristics such as sensitivity and signal-to-noise ratio deteriorate. The present invention was made to overcome these drawbacks that occur when conventional resins are used, and an object of the present invention is to provide a magnetic recording medium containing a binder with excellent dispersibility. That is, the present invention provides a magnetic recording medium in which a magnetic layer containing ferromagnetic powder and a binder is provided on a nonmagnetic substrate, in which the binder component is a copolymer consisting of polycaprolactone polyol, diamine, and isocyanate as a curing agent. The main component is a crosslinked product formed by crosslinking. The polycaprolactone polyol (hereinafter referred to as "PC"), which is the raw material for producing the copolymer used in the present invention,
It is abbreviated as ) is not particularly limited in molecular weight or number of terminal hydroxyl groups, and commercially available products can be used as they are. For example, manufactured by Dial
Examples include Placcel (trademark of the company) and NIAX PCP manufactured by UCC (trademark of the company). The diamine (hereinafter abbreviated as "DI") may be a compound having one or two primary amino groups or a compound having two secondary amino groups, and among them, phenylene diamine, alkylene diamine, etc. preferable. The above-mentioned isocyanate (hereinafter abbreviated as "IS")
As the diisocyanate, common isocyanate compounds such as tolylene diisocyanate, diphenylmethane diisocyanate, and hexamethylene diisocyanate can be used. Specific examples of the method for producing the copolymer are shown in Examples, but the method is not particularly limited, and known methods such as solution polymerization and emulsion polymerization can be employed. PC, DA used in the production of the above copolymer
The proportion of PC and IS is calculated based on the total amount of
20-80 wt%, DA 10-40 wt%, IS 10-40
It is preferable to express it in weight%. Examples of materials that are mixed with the ferromagnetic powder together with the copolymer and serve as a curing agent for the copolymer include polyisocyanate (hereinafter abbreviated as "PIS") and epoxy resin. The former is preferred because the curing reaction is quick. As PIS, for example, trimethylolpropane 1
A trifunctional low molecular weight isocyanate compound which is a reaction product of 3 moles of tolylene diisocyanate and 3 moles of tolylene diisocyanate can be mentioned. The reactant is commercially available from Bayer AG under the trade name "Desmodyur L" and from Nippon Polyurethane Industries Co., Ltd. under the trade name "Coronate L". If the amount of PIS mixed into the copolymer is too large, the final coating film obtained will become brittle, and if it is too small, problems will arise in solvent resistance, etc.
A suitable amount is 5 to 30 parts by weight. The ferromagnetic powder in the present invention is not particularly limited, and includes, for example, γ-Fe 2 O 3 , Co-γ-
Fe 2 O 3 , CrO 2 , metallic iron, cobalt, nickel,
Examples include iron alloys such as copper, chromium, and silicon. A magnetic paint is obtained by dissolving the binder in a solvent, adding ferromagnetic powder to it, mixing it, and dispersing it.
The order of addition of the binder and the ferromagnetic powder, the dispersion means, etc. are not limited at all. Next, the present invention will be explained in more detail with reference to examples, but the present invention is not limited to these. EXAMPLE A reaction vessel equipped with a stirring bar, a condenser, a dropping device, a nitrogen blowing tube, and a thermometer is used. First, the reactor was heated to 50°C, purged with nitrogen, 10 parts by weight of diphenylmethane diisocyanate and 25 parts by weight of polycaprolactone diol with an average molecular weight of 1250 were added, and the contents were heated to 80°C under a nitrogen atmosphere while stirring. , carry out the reaction for 4 hours. 50 after the reaction
Cool to ℃, add 28 parts by weight of dimethyl formamide, and stir for 30 minutes to uniformly dissolve. On the other hand, prepare a solution of 9 parts by weight of bisaminopropylpiperazine in 28 parts by weight of dimethyl formamide, add it to the reaction product, react with stirring at 50°C under nitrogen atmosphere for 2 hours, and after the reaction, warm to room temperature. Allow to cool. The resin concentration of the resulting reaction product was 44 weight percent. Using this reaction product,
As shown in Table 1, magnetic paints were prepared by mixing and dispersing for 48 hours using a ball mill using various combinations of various ferromagnetic powders together with curing agents.
This paint was applied on a 12μ thick polyester film substrate by a known method, dried and cured at 80℃ for 30 minutes to form a 4μ thick magnetic layer, and cut into 10mm width pieces. I made magnetic tape. Comparative Example Among the blended compositions of Examples, vinyl chloride, vinyl acetate, and vinyl alcohol copolymer (manufactured by UCC; trade name:
Magnetic tapes were produced in exactly the same manner as in the example except that VAGH (resin content: 100%) or polyurethane resin (manufactured by Nippon Polyurethane Industries Co., Ltd.; trade name: Nitsuporan 2304; resin content: 35% by weight) was used. did. The formulation table is summarized in Table 2. However, for comparison with Examples, the amounts of binder and solvent are the same.
【表】【table】
【表】
実施例および比較例において得られた磁気テー
プの磁気特性並びに光沢度のデータを表３にまと
めて示す。この表から磁性粉として、γ−
Fe2O3、Co−γ−Fe2O3及びFe合金を用いた場合
のいずれにおいても磁気特性（残留磁束密度
（Br）、角形比（Br／Bm））および表面光沢性に
おいて、高分散性記録媒体としての本発明による
磁気テープの優秀性が明らかである。[Table] Table 3 summarizes data on the magnetic properties and glossiness of the magnetic tapes obtained in Examples and Comparative Examples. From this table, as magnetic powder, γ-
High dispersion is achieved in magnetic properties (residual flux density (Br), squareness ratio (Br/Bm)) and surface gloss when Fe 2 O 3 , Co-γ-Fe 2 O 3 and Fe alloys are used. The superiority of the magnetic tape according to the invention as a magnetic recording medium is obvious.
Claims (1)
む磁性層を設けた磁気記録媒体において、該結合
剤成分がポリカプロラクトンポリオール、ジアミ
ン及びイソシアネートからなる共重合体をその硬
化剤で架橋してなる架橋体を主成分とすることを
特徴とする前記磁気記録媒体。 ２ 前記架橋体が、前記硬化剤としてポリイソシ
アネートを使用したものであることを特徴とする
第１項記載の磁気記録媒体。 ３ 前記架橋体が、前記硬化剤としてエポキシ樹
脂を使用したものであることを特徴とする第１項
記載の磁気記録媒体。[Scope of Claims] 1. A magnetic recording medium in which a magnetic layer containing ferromagnetic powder and a binder is provided on a non-magnetic substrate, wherein the binder component is a copolymer consisting of a polycaprolactone polyol, a diamine, and an isocyanate. The above-mentioned magnetic recording medium is characterized in that the main component is a crosslinked product formed by crosslinking with an agent. 2. The magnetic recording medium according to item 1, wherein the crosslinked body uses polyisocyanate as the curing agent. 3. The magnetic recording medium according to item 1, wherein the crosslinked body uses an epoxy resin as the curing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13496282A JPS5928219A (en) | 1982-08-02 | 1982-08-02 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13496282A JPS5928219A (en) | 1982-08-02 | 1982-08-02 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5928219A JPS5928219A (en) | 1984-02-14 |
| JPH0159647B2 true JPH0159647B2 (en) | 1989-12-19 |
Family
ID=15140648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13496282A Granted JPS5928219A (en) | 1982-08-02 | 1982-08-02 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5928219A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4708199A (en) * | 1985-02-28 | 1987-11-24 | Kabushiki Kaisha Tsuchiya Seisakusho | Heat exchanger |
| US4722231A (en) * | 1985-05-14 | 1988-02-02 | Yamatake-Honeywell Co., Ltd. | Electromagnetic flowmeter |
| US4892136A (en) * | 1986-12-31 | 1990-01-09 | Kabushiki Kaisha Tsuchiya Seisakusho | Heat exchanger |
| US4836276A (en) * | 1987-03-09 | 1989-06-06 | Nippondenso Co., Ltd. | Heat exchanger for engine oil |
| JPH06101113B2 (en) * | 1988-10-21 | 1994-12-12 | 大日精化工業株式会社 | Magnetic recording medium |
| JPH04372654A (en) * | 1991-06-21 | 1992-12-25 | Chisso Corp | Thermosetting adhesive film and method of its use |
-
1982
- 1982-08-02 JP JP13496282A patent/JPS5928219A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5928219A (en) | 1984-02-14 |
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