JPS61223068A - Magnetic paint - Google Patents
Magnetic paintInfo
- Publication number
- JPS61223068A JPS61223068A JP60063202A JP6320285A JPS61223068A JP S61223068 A JPS61223068 A JP S61223068A JP 60063202 A JP60063202 A JP 60063202A JP 6320285 A JP6320285 A JP 6320285A JP S61223068 A JPS61223068 A JP S61223068A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- mercaptopurine
- powder
- paint
- magnetic powder
- 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
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 69
- 239000003973 paint Substances 0.000 title claims abstract description 26
- 239000006247 magnetic powder Substances 0.000 claims abstract description 26
- GLVAUDGFNGKCSF-UHFFFAOYSA-N mercaptopurine Chemical compound S=C1NC=NC2=C1NC=N2 GLVAUDGFNGKCSF-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229960001428 mercaptopurine Drugs 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 abstract description 18
- 230000005294 ferromagnetic effect Effects 0.000 abstract description 16
- 239000000203 mixture Substances 0.000 abstract description 15
- 239000011230 binding agent Substances 0.000 abstract description 5
- 239000002270 dispersing agent Substances 0.000 abstract description 4
- 229910020630 Co Ni Inorganic materials 0.000 abstract description 2
- 229910002440 Co–Ni Inorganic materials 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 230000003064 anti-oxidating effect Effects 0.000 abstract description 2
- 239000002184 metal Substances 0.000 description 14
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 238000004381 surface treatment Methods 0.000 description 6
- VABISHCLVYMGAU-UHFFFAOYSA-N 7,9-dihydropurine-8-thione Chemical compound N1=CN=C2NC(S)=NC2=C1 VABISHCLVYMGAU-UHFFFAOYSA-N 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003078 antioxidant effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920006267 polyester film Polymers 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000006249 magnetic particle Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920003225 polyurethane elastomer Polymers 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910006297 γ-Fe2O3 Inorganic materials 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
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- -1 Vinyl-vinyl Chemical group 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000001914 filtration Methods 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
- 230000005415 magnetization Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
- Hard Magnetic Materials (AREA)
- Paints Or Removers (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、磁性塗料に関する。より詳しくは、酸化防止
作用の優れた磁気記録媒体を形成することのできる強磁
性金属粉末を磁性体として用いる磁性塗料に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a magnetic paint. More specifically, the present invention relates to a magnetic coating material using ferromagnetic metal powder as a magnetic material, which can form a magnetic recording medium with excellent anti-oxidation effect.
［従来の技術］
従来より、ポリエステルフィルム等の非磁性物質からな
る支持体上に、磁性粉末をバインダー中に分散させた磁
性塗料を塗布して形成される塗布型の磁気記録媒体が広
く用いられている。磁性粉末としては一般にγ−Ｆｅ２
Ｏ３、Ｇｏを被着させたγ−Ｆｅ２Ｏ３等の酸化物磁性
体の粉末が用いられているが、近年、主として記録密度
の向上を目的として、酸化物磁性体の粉末の代りに１強
磁性金属粉末が一使用されることが多くなった。この強
磁性金属粉末は、飽和磁化（Ｂｓ）および抗磁力（Ｈａ
）が大きく、これを磁性体として用いた磁性塗料から形
成される磁気記録媒体は、優れた磁気特性を有する。し
かしその反面、磁性体としてγ−Ｆｅ２Ｏ３系の酸化物
を用いた従来の磁性塗料から形成された磁気記録媒体に
は見られなかった新たな欠点が生じている。[Prior Art] Coating-type magnetic recording media have been widely used, which are formed by applying a magnetic paint containing magnetic powder dispersed in a binder onto a support made of a non-magnetic material such as a polyester film. ing. Generally, γ-Fe2 is used as magnetic powder.
Powders of oxide magnetic materials such as γ-Fe2O3 coated with O3 and Go have been used, but in recent years, ferromagnetic metal powders have been used instead of oxide magnetic powders, mainly for the purpose of improving recording density. Powders are increasingly being used. This ferromagnetic metal powder has saturation magnetization (Bs) and coercive force (Ha
) is large, and a magnetic recording medium formed from a magnetic paint using this as a magnetic material has excellent magnetic properties. However, on the other hand, a new drawback has arisen that has not been seen in magnetic recording media formed from conventional magnetic paints using γ-Fe2O3-based oxides as magnetic substances.
すなわち、強磁性金属粉末を磁性体として用いた磁気記
録媒体においては、高温多湿下にさらされると、強磁性
金属粉末が酸化されることにより、支持体上に塗布して
形成された磁性層の磁気特性が経時的に劣化するという
現象が観察されることである。In other words, in a magnetic recording medium that uses ferromagnetic metal powder as a magnetic material, when exposed to high temperature and humidity, the ferromagnetic metal powder is oxidized, causing the magnetic layer formed by coating it on a support to deteriorate. A phenomenon in which magnetic properties deteriorate over time is observed.
上述した問題点を解決するため、例えば還元して製造し
た強磁性金属粉末の表面を徐々に酸化させ粒子表面に薄
い酸化被膜を形成させる方法、強磁性金属粉末表面を酸
化されにくい金属で被膜したり、あるいはシリコーンオ
イルや高級脂肪酸などの有機物で被覆する方法１強磁性
金属粉末表面に酸化防止剤を吸着させたり、酸化防止剤
をバインダー樹脂中に分散させる方法等の種々の方法が
提案されている。In order to solve the above-mentioned problems, for example, methods have been developed in which the surface of ferromagnetic metal powder produced by reduction is gradually oxidized to form a thin oxide film on the particle surface, and the surface of ferromagnetic metal powder is coated with a metal that is difficult to oxidize. Various methods have been proposed, such as coating with organic substances such as silicone oil or higher fatty acids.1 Various methods have been proposed, such as adsorbing antioxidants on the surface of ferromagnetic metal powders, or dispersing antioxidants in binder resins. There is.
しかし、これらの方法を用いて製造された磁性塗料から
形成される磁気記録媒体も、酸化防止作用に関しては未
だ十分満足できるものとは言えなかった。However, magnetic recording media formed from magnetic paints produced using these methods have not yet been fully satisfactory in terms of antioxidant effect.
［発明が解決しようとする問題点］
本発明は、上述した問題点に鑑み成されたものであり、
高温多湿下における耐酸化性に優れ、結果として磁気特
性の経時的劣化が抑制できる磁気記録媒体を形成可能な
磁性塗料を提供することを目的とする。[Problems to be solved by the invention] The present invention has been made in view of the above-mentioned problems,
An object of the present invention is to provide a magnetic coating material that can form a magnetic recording medium that has excellent oxidation resistance under high temperature and high humidity conditions and can suppress deterioration of magnetic properties over time.
［問題点を解決するための手段］
上記目的を達成する本発明は、磁気記録媒体形成用の磁
性塗料に於いて、下記化学式で表わされる６−メルカプ
トプリンで表面処理された磁性粉末が含有されて成るこ
とを特徴とする磁性塗料である。[Means for Solving the Problems] The present invention achieves the above object by providing a magnetic paint for forming a magnetic recording medium containing magnetic powder surface-treated with 6-mercaptopurine represented by the following chemical formula. It is a magnetic paint characterized by consisting of:
［発明の実施態様］
本発明に言う６−メルカプトプリンで表面処理された磁
性粉末とは、以下に説明するようなものである。[Embodiments of the Invention] The magnetic powder surface-treated with 6-mercaptopurine referred to in the present invention is as described below.
磁性粉末としては、本発明の目的からして、強磁性粉末
を用いるのがよい。For the purpose of the present invention, it is preferable to use ferromagnetic powder as the magnetic powder.
８−メルカプトプリンによる磁性粉末の表面処理は、ト
メルカプトプリンと磁性粉末とを所望の時間接触させる
ことができる方法であるならば、いかなる方法を用いて
行なってもよい。The surface treatment of the magnetic powder with 8-mercaptopurine may be carried out using any method as long as it allows tomercaptopurine and the magnetic powder to be brought into contact for a desired period of time.
一般に、磁性塗料は、磁性粉末、バインダー、分散剤、
研摩材等の組成物を十分混合分散後に硬化剤を付与して
形成されるが、６−メルカプトプリンによる磁性粉末の
表面処理は磁性塗料の製造のいかなる段階で行なわれて
もよい、しかしながら、硬化剤の付与後は磁性粉末の表
面処理を行なうのが事実上不可能となるので、硬化剤の
付与以前に８−メルカプトプリンによる磁性粉末の表面
処理を行なうとよい。Generally, magnetic paint consists of magnetic powder, binder, dispersant,
It is formed by applying a curing agent after thoroughly mixing and dispersing a composition such as an abrasive, but the surface treatment of magnetic powder with 6-mercaptopurine may be carried out at any stage in the production of magnetic paint. Since it is practically impossible to perform surface treatment of the magnetic powder after applying the agent, it is preferable to perform surface treatment of the magnetic powder with 8-mercaptopurine before applying the hardening agent.
特に、製造の簡便さからは、前記組成物に８−メ。Particularly, from the viewpoint of ease of production, the composition has an 8-molecular weight.
ルカプトプリンをも添加して混合し、前記組成物の混合
と同時に８−メルカプトプリンで表面処理がなされた磁
性粉末であることが好ましい、しかし、前記組成物の混
合前にあらかじめＢ−メルカプトプリンで表面処理がな
された磁性粉末÷もよい、′
本発明の磁性塗料の最も簡便な製造方法につき以下に説
明する。Preferably, the magnetic powder is prepared by adding and mixing lucatopurine and surface-treated with 8-mercaptopurine at the same time as mixing the composition. However, before mixing the composition, the surface is treated with B-mercaptopurine in advance. The most simple method for producing the magnetic paint of the present invention will be described below.
まず、磁性塗料の原料となる従来公知の磁性粉末、バイ
ンダー、分散剤、研摩材等の組成物と８−メルカプトプ
リンとをサンドグラインダー、ニーダ−等で十分混合す
る。この混合の際に、６−メルカプトプリンによる磁性
粉末の表面処理も同時に行なわれる。First, 8-mercaptopurine and a conventionally known composition of magnetic powder, binder, dispersant, abrasive, etc., which is a raw material for a magnetic paint, are thoroughly mixed using a sand grinder, kneader, or the like. During this mixing, the surface treatment of the magnetic powder with 6-mercaptopurine is also carried out at the same time.
６−メルカプトプリンの添加量は、前記組成物を構成す
る溶媒等の量によっても異なってくるが、通常磁性粉末
に対して０．５〜１０重量部の範囲が好ましい、０．５
重量部未満では、磁性粉末の表面処理を十分に行なうこ
とができず、本発明の目的が十分達成できない、また、
１０重量部を越えると。The amount of 6-mercaptopurine added varies depending on the amount of solvent etc. constituting the composition, but it is usually preferably in the range of 0.5 to 10 parts by weight based on the magnetic powder, 0.5
If the amount is less than 1 part by weight, the surface treatment of the magnetic powder cannot be sufficiently performed, and the object of the present invention cannot be fully achieved.
If it exceeds 10 parts by weight.
製造された磁性塗料から形成される磁気記録媒体の磁性
層がブリードアウト現象や可塑化現象を□生じやすく、
磁気記録媒体の磁気特性が劣化するため適当でない。The magnetic layer of the magnetic recording medium formed from the manufactured magnetic paint is prone to bleed-out and plasticization phenomena.
This is not suitable because it deteriorates the magnetic properties of the magnetic recording medium.
次に、十分混合され、往つ、Ｂ−メルカプトプリンで表
面処理された磁性粉末を含む前記組成物を撹拌機へ移し
、更にこの撹拌機中へ硬化剤も添加する。この硬化剤と
前記組成物とを撹拌機により十分撹拌することにより、
６−メルカプトプリンで表面処理された磁性粉末を含有
する本発明の磁性塗料の製造を完了する。The well-mixed composition containing the magnetic powder surface treated with B-mercaptopurine is then transferred to a stirrer into which the curing agent is also added. By sufficiently stirring this curing agent and the composition using a stirrer,
The production of the magnetic paint of the present invention containing magnetic powder surface-treated with 6-mercaptopurine is completed.
８−メルカプトプリンで表面処理された磁性粉末を用い
た磁性塗料から形成される磁気記録媒体は、酸化されに
くくなる。従って、その磁気特性も劣化しにくくなる。A magnetic recording medium formed from a magnetic paint using magnetic powder surface-treated with 8-mercaptopurine is less susceptible to oxidation. Therefore, its magnetic properties are also less likely to deteriorate.
このような効果が生じる理由は必ずしも明らかではない
が、６−メルカプトプリンと磁性粒子とが相互作用を起
して錯体の形となり、その結果として磁性粒子表面が保
護されるためと考えられる。The reason why such an effect occurs is not necessarily clear, but it is thought to be because 6-mercaptopurine and the magnetic particles interact to form a complex, and as a result, the surface of the magnetic particles is protected.
［実施例］
以下、実施例、比較例により本発明を更に具体的に説明
する。[Examples] Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples.
〔実施例１〕 ※部→重量部強磁性金
属粉末（Ｆｅ−Ｇｏ−Ｎｉ合金、長径０．２５μｓ、軸
比８） ｌｏｏ部塩部上化ビニル酸ビニル−ビニルア
ルコール共重合体（重合モル比 ９１：３：８）
１５部ポリウレタンエラストマー １０部
α−Ｍ２ｏｓＣ研摩材） ５部レシチ
ン（分散剤） １部メチルエチルケ
トン １２０部トルエン
１２０部Ｂ−メルカプトプリン
２部−上記組成物をサンドグラインダーにて
混入分散を行なった。[Example 1] Part * → Part by weight Ferromagnetic metal powder (Fe-Go-Ni alloy, major axis 0.25 μs, axial ratio 8) Loo part Salt part Vinyl vinyl acid oxide-vinyl alcohol copolymer (polymerization molar ratio 91:3:8)
15 parts polyurethane elastomer 10 parts α-M2osC abrasive) 5 parts lecithin (dispersant) 1 part methyl ethyl ketone 120 parts toluene
120 parts B-Mercaptopurine
2 parts - The above composition was mixed and dispersed using a sand grinder.
次に、混合された上記組成物を撹拌機に移し、下記化学
式
ポリイソシアネート架橋剤を５部添加し、撹拌機で十分
に撹拌して磁性塗料を製造した。Next, the mixed composition was transferred to a stirrer, 5 parts of a polyisocyanate crosslinking agent having the chemical formula shown below was added thereto, and the mixture was thoroughly stirred using the stirrer to produce a magnetic paint.
〔実施例２〕
強磁性金属粉末（Ｆｅ−Ｃｏ−Ｎｉ合金、長径０．２５
μｓ、軸比８） １００部Ｂ−メルカプトプリン
５部エチルアルコール
５００部上記組成の混合物を撹拌機により３時間混合
した。[Example 2] Ferromagnetic metal powder (Fe-Co-Ni alloy, major axis 0.25
μs, axial ratio 8) 100 parts B-Mercaptopurine
5 parts ethyl alcohol
500 parts of the mixture having the above composition were mixed for 3 hours using a stirrer.
次に、濾過により溶液を除去した後に、強磁性粉末を乾
燥してＢ−メルカプトプリンで表面処理された強磁性金
属粉末を形成した。The ferromagnetic powder was then dried to form a B-mercaptopurine surface treated ferromagnetic metal powder after removing the solution by filtration.
次に、以下の組成で実施例１と同様にして磁性塗料を製
造した。Next, a magnetic paint was produced in the same manner as in Example 1 with the following composition.
上記処理を施した強磁性金属粉末 １００部ｍ化ビ
ニルー酢酸ビニルービニルアルコール共重合体（重合モ
ル比 ９１：３：８） １５部ポリウレタンエラ
ストマー １０部α−ｈｉｌ、’３（研摩材
） ５部メチルエチルケトン
１２０部トルエン
１２０部〔比較例〕
Ｂ−メルカプトプリンを用いない以外は、実施例１と同
様にして磁性塗料を製造した。Ferromagnetic metal powder subjected to the above treatment 100 parts Vinyl-vinyl acetate-vinyl alcohol copolymer (polymerization molar ratio 91:3:8) 15 parts Polyurethane elastomer 10 parts α-hil, '3 (abrasive) 5 parts Methyl ethyl ketone
120 parts toluene
120 parts [Comparative Example] A magnetic paint was produced in the same manner as in Example 1 except that B-mercaptopurine was not used.
実施例１．２及び比較例で製造した磁性塗料をそれぞれ
厚さｌＯ−のポリエステルフィルムとに塗布し、所定方
向（この場合、フィルムの厚さ方向）に磁界をかけて磁
気的な配向処理を施した。The magnetic paints produced in Example 1.2 and Comparative Example were each applied to a polyester film having a thickness of lO-, and a magnetic field was applied in a predetermined direction (in this case, the thickness direction of the film) to perform a magnetic orientation treatment. provided.
次に、乾燥工程を経た後に、表面平滑化のためにカレン
ダー処理を施し厚さ約３１ＡＩＩｌの磁性層をポリエス
テルフィルム上に形成した０次に、５０℃で２４時間放
置した後に所定の幅（この場合、０．８ ｃｍ幅）に裁
断して磁気テープを作成した。Next, after a drying process, a magnetic layer with a thickness of about 31 AIIl was formed on the polyester film by calendering to smooth the surface.Next, after leaving it at 50°C for 24 hours, a predetermined width (this A magnetic tape was prepared by cutting the tape into pieces (0.8 cm wide).
このようにして作成した磁気テープの初期の残留磁束密
度、角型比、抗磁力を測定した。結果を第１表に示す、
また、それぞれの磁気テープを８０℃、９０％ＲＨ条件
下に放置して残留磁束密度の時間経過による変化を測定
した。結果を第１図に示す。The initial residual magnetic flux density, squareness ratio, and coercive force of the magnetic tape thus prepared were measured. The results are shown in Table 1.
Further, each magnetic tape was left under conditions of 80° C. and 90% RH, and changes in residual magnetic flux density over time were measured. The results are shown in Figure 1.
第１表及び第１図から明らかなように、Ｂ−メルカプト
プリンで処理された強磁性金属粉末を含む磁性塗料から
形成された磁気テープは、初期の磁気特性が劣化するこ
とがなく、しかも、時間が経過しても残留磁束密度の低
下は従来の磁性塗料から形成された磁気テープと比較し
て極めて小さい、このことから本発明の磁性塗料は、酸
化防止作用の優れた磁気テープを形成することができる
ことは明らかである。As is clear from Table 1 and FIG. 1, the magnetic tape formed from the magnetic paint containing the ferromagnetic metal powder treated with B-mercaptopurine has no deterioration in its initial magnetic properties; Even with the passage of time, the decrease in residual magnetic flux density is extremely small compared to magnetic tapes made from conventional magnetic paints.Thus, the magnetic paint of the present invention forms magnetic tapes with excellent antioxidant properties. It is clear that it can be done.
第１表
［発明の効果］
以りに説明した如く、６−メルカプトプリンで表面処理
した磁性粉末を含有する本発明の磁性塗料を用いて磁気
記録媒体を形成することによって、酸化防止作用に優れ
、結果として時間を経ても磁気特性の劣化しない磁気記
録媒体の形成が可能となった。Table 1 [Effects of the Invention] As explained above, by forming a magnetic recording medium using the magnetic coating of the present invention containing magnetic powder surface-treated with 6-mercaptopurine, an excellent antioxidant effect can be obtained. As a result, it has become possible to form a magnetic recording medium whose magnetic properties do not deteriorate over time.
第１図は、実施例及び比較例で製造した磁性塗料を用い
て形成した磁気テープの残留磁束密度の経時変化を示す
図である。FIG. 1 is a diagram showing changes over time in the residual magnetic flux density of magnetic tapes formed using the magnetic paints manufactured in Examples and Comparative Examples.
Claims (1)
学式で表わされる６−メルカプトプリンで表面処理され
た磁性粉末が含有されて成ることを特徴とする磁性塗料
。 ▲数式、化学式、表等があります▼(1) A magnetic paint for forming a magnetic recording medium, characterized in that it contains magnetic powder surface-treated with 6-mercaptopurine represented by the following chemical formula. ▲Contains mathematical formulas, chemical formulas, tables, etc.▼
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60063202A JPS61223068A (en) | 1985-03-29 | 1985-03-29 | Magnetic paint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60063202A JPS61223068A (en) | 1985-03-29 | 1985-03-29 | Magnetic paint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61223068A true JPS61223068A (en) | 1986-10-03 |
Family
ID=13222384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60063202A Pending JPS61223068A (en) | 1985-03-29 | 1985-03-29 | Magnetic paint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61223068A (en) |
-
1985
- 1985-03-29 JP JP60063202A patent/JPS61223068A/en active Pending
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