JP2001202613A - Magnetic recording medium - Google Patents

Magnetic recording medium

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Publication number
JP2001202613A
JP2001202613A JP2000339817A JP2000339817A JP2001202613A JP 2001202613 A JP2001202613 A JP 2001202613A JP 2000339817 A JP2000339817 A JP 2000339817A JP 2000339817 A JP2000339817 A JP 2000339817A JP 2001202613 A JP2001202613 A JP 2001202613A
Authority
JP
Japan
Prior art keywords
fatty acid
weight
parts
recording medium
magnetic recording
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.)
Granted
Application number
JP2000339817A
Other languages
Japanese (ja)
Other versions
JP4507042B2 (en
Inventor
Kenichi Kitamura
健一 北村
Sadafumi Iijima
定史 飯島
Osamu Inoue
修 井上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Corp
Original Assignee
TDK Corp
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Filing date
Publication date
Application filed by TDK Corp filed Critical TDK Corp
Priority to JP2000339817A priority Critical patent/JP4507042B2/en
Publication of JP2001202613A publication Critical patent/JP2001202613A/en
Application granted granted Critical
Publication of JP4507042B2 publication Critical patent/JP4507042B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic recording medium with high recording density which has excellent durability and less sticking of a medium on a head even when a magnetic layer is as thin as <=0.2 μm thickness and which causes no bleeding of a lubricant even when the medium is stored at high temperature and high humidity. SOLUTION: The magnetic recording medium has a nonmagnetic layer of 0.4 to 2.0 μm film thickness essentially containing nonmagnetic powder and a binder on a nonmagnetic supporting body, and has a magnetic layer of <=0.2 μm film thickness thereon. In this medium, the nonmagnetic layer contains a fatty acid, fatty acid amide and fatty acid ester.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、非磁性層を有し、
その上に磁性層を有する磁気記録媒体に於いて、ヘッド
付着が良好で、耐久性に優れた、特にデジタル信号を高
記録密度で記録再生する磁気記録媒体に関するものであ
る。
TECHNICAL FIELD The present invention relates to a non-magnetic layer having a non-magnetic layer,
The present invention relates to a magnetic recording medium having a magnetic layer thereon and having good head adhesion and excellent durability, particularly for recording and reproducing digital signals at a high recording density.

【0002】[0002]

【従来の技術】特公昭57−4967号公報、特公昭5
6−10688号公報、特公平1−25136号公報な
どの各公報には、磁性層に脂肪酸アミドを使用した開示
がなされ、表面性、分散性、摩擦が低減されることによ
る効果を証して、様々な潤滑剤との組み合わせにより使
用されることが提案されている。また、特許第2822
191号公報には、磁性層においてエポキシ基やスルホ
ン酸等の極性基を有する樹脂と脂肪酸アミドとの組合わ
せにより用いることが提案されている。
2. Description of the Related Art Japanese Patent Publication No. 57-4967, Japanese Patent Publication No.
JP-A-6-10688 and JP-B-1-25136 disclose the use of a fatty acid amide for the magnetic layer, and demonstrate the effects of reducing surface properties, dispersibility, and friction. It has been proposed to be used in combination with various lubricants. Patent No. 2822
JP 191 proposes to use a resin having a polar group such as an epoxy group or a sulfonic acid in a magnetic layer in combination with a fatty acid amide.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、近年高
記録密度磁気記録に対応するために磁性層厚みが0.2
μm以下と、ごく薄膜化される傾向にあり、このように
薄い磁性層を有する磁気記録媒体に上記各公報に開示さ
れた潤滑剤や樹脂の組み合わせを適用したとしても磁性
層が非常に薄いために潤滑剤の絶対量が不足し充分な耐
久性や、信頼性を得ることが出来ない。また多量に添加
すると高温高湿での保存時に潤滑剤が吐出するなどの問
題が発生する場合が多くなる。
However, in recent years, in order to cope with high recording density magnetic recording, the thickness of the magnetic layer has to be 0.2.
μm or less, tend to be very thin, even if a combination of the lubricants and resins disclosed in the above publications is applied to a magnetic recording medium having such a thin magnetic layer because the magnetic layer is very thin In addition, the absolute amount of the lubricant is insufficient, and sufficient durability and reliability cannot be obtained. Also, when added in a large amount, problems such as discharge of lubricant during storage at high temperature and high humidity often occur.

【0004】本発明は0.2μm以下と薄い磁性層であって
も耐久性、ヘッド付着に優れ、しかも高温高湿での保存
においても潤滑剤の吐出が生じない高記録密度磁気記録
媒体を得ることを目的とする。
[0004] The present invention provides a high recording density magnetic recording medium which is excellent in durability and head adhesion even when the magnetic layer is as thin as 0.2 μm or less, and which does not emit a lubricant even when stored at high temperature and high humidity. The purpose is to:

【0005】[0005]

【課題を解決するための手段】上記目的は以下の本発明
の構成とすることにより達成できる。 (1)非磁性支持体上に、非磁性粉末と結合剤を主とし
て含む膜厚0.4〜2.0μmの非磁性層を有し、その上
に膜厚0.2μm以下の磁性層を有する磁気記録媒体に
おいて、該非磁性層中に脂肪酸、脂肪酸アミド、脂肪酸
エステルを含んだことを特徴とする磁気記録媒体。 (2)非磁性粉末100重量部に対して非磁性層中の脂
肪酸、脂肪酸アミド、脂肪酸エステルの総量が1.0〜
2.3重量部、脂肪酸が0.2〜1.0重量部、脂肪酸
アミドが0.1〜0.5重量部、脂肪酸エステルが0.
5〜1.0重量部であることを特徴とする上記(1)に
記載の磁気記録媒体。 (3)脂肪酸がステアリン酸、脂肪酸アミドがステアリ
ン酸アミド、脂肪酸エステルがステアリン酸ブチルであ
ることを特徴とする上記(1)又は(2)に記載の磁気
記録媒体。 (4)非磁性粉末がα酸化鉄及び/又はカーボンブラッ
クを含むことを特徴とする上記(1)、(2)又は
(3)に記載の磁気記録媒体。 (5)α酸化鉄がAl又はSiで表面処理されているこ
とを特徴とする上記(4)に記載の磁気記録媒体。 (6)カーボンブラックのBET法による比表面積(B
ET値)が40〜70m 2/g、平均粒径25〜40n
m、DBP吸油量が40〜55cc/100gであるこ
とを特徴とする上記(4)又は(5)に記載の磁気記録
媒体。
The object of the present invention is as follows.
It can be achieved by adopting the configuration of (1) Non-magnetic powder and binder mainly on non-magnetic support
A non-magnetic layer having a thickness of 0.4 to 2.0 μm.
Magnetic recording medium having a magnetic layer with a thickness of 0.2 μm or less
The fatty acid, fatty acid amide, fatty acid
A magnetic recording medium comprising an ester. (2) 100 parts by weight of non-magnetic powder to fat in non-magnetic layer
Fatty acid, fatty acid amide, total amount of fatty acid ester is 1.0 to
2.3 parts by weight, 0.2-1.0 parts by weight of fatty acid, fatty acid
0.1 to 0.5 parts by weight of amide and 0.1 to 0.5 parts by weight of fatty acid ester.
5 to 1.0 part by weight according to the above (1),
The magnetic recording medium according to the above. (3) Fatty acid stearic acid, fatty acid amide stearie
Acid amide and fatty acid ester are butyl stearate
The magnetic device according to the above (1) or (2), wherein
recoding media. (4) The nonmagnetic powder is α iron oxide and / or carbon black.
(1), (2) or
The magnetic recording medium according to (3). (5) α iron oxide is surface-treated with Al or Si
The magnetic recording medium according to the above (4), characterized in that: (6) Specific surface area (B
ET value) 40-70m Two/ G, average particle size 25-40n
m, DBP oil absorption should be 40 ~ 55cc / 100g
The magnetic recording according to the above (4) or (5), characterized in that:
Medium.

【0006】[0006]

【発明の実施の形態】本発明は、非磁性層中に非磁性粉
末と、潤滑剤として脂肪酸、脂肪酸アミド、脂肪酸エス
テルを極めて限られた量の範囲で含ませたので、磁性層
の摩擦が下がり耐久性が良くなるという効果を有する。
磁性層のみに脂肪酸、脂肪酸エステルと共に脂肪酸アミ
ドを添加すると、脂肪酸アミドが少量では摩擦が下がる
が、磁性層が薄膜化された媒体においては、磁性層が薄
いために含まれる量が非常に少なくなり、耐久性を向上
させるほどの効果がない。逆に多量に添加すると、例え
ば、磁性紛100重量部に対し1重量部ほど入れると、
磁性層表面に吐出したり、塗料の凝集がおきてしまう。
BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, since the nonmagnetic layer contains a nonmagnetic powder and a very limited amount of fatty acids, fatty acid amides and fatty acid esters as lubricants, friction of the magnetic layer is reduced. This has the effect of improving the falling durability.
When fatty acid amide is added to the magnetic layer alone together with the fatty acid and fatty acid ester, a small amount of the fatty acid amide reduces friction, but in a medium having a thin magnetic layer, the amount contained is very small because the magnetic layer is thin. Is not effective enough to improve durability. Conversely, if a large amount is added, for example, if about 1 part by weight is added to 100 parts by weight of the magnetic powder,
Discharge onto the surface of the magnetic layer and aggregation of the paint may occur.

【0007】本発明では非磁性層中に非磁性粉末と、脂肪
酸、脂肪酸アミド、脂肪酸エステルを含み、非磁性粉末
100重量部に対して、脂肪酸、脂肪酸アミド、脂肪酸
エステルの総量が1.0〜2.3重量部であり、かつ、
脂肪酸が0.2〜1.0重量部、脂肪酸アミドが0.1
〜0.5重量部、脂肪酸エステルが0.5〜1.0重量
部であるようにしたため吐出を起こさずに、磁性層の摩
擦が低下し耐久性が向上するという効果が得られる。好
ましくは、脂肪酸が0.3〜0.5重量部、脂肪酸アミ
ドが0.1〜0.3重量部、脂肪酸エステルが0.6〜
0.9重量部である。
In the present invention, the nonmagnetic layer contains a nonmagnetic powder, a fatty acid, a fatty acid amide and a fatty acid ester, and the total amount of the fatty acid, the fatty acid amide and the fatty acid ester is 1.0 to 100 parts by weight of the nonmagnetic powder. 2.3 parts by weight, and
Fatty acid is 0.2 to 1.0 parts by weight, fatty acid amide is 0.1
Since 0.5 to 1.0 part by weight and the fatty acid ester are 0.5 to 1.0 part by weight, the effect that the friction of the magnetic layer is reduced and the durability is improved can be obtained without causing ejection. Preferably, the fatty acid is 0.3 to 0.5 parts by weight, the fatty acid amide is 0.1 to 0.3 parts by weight, and the fatty acid ester is 0.6 to 0.5 parts by weight.
0.9 parts by weight.

【0008】上記の効果が発生する理由は明確ではないが、
非磁性層に含まれている脂肪酸は、一般的には、非磁性
層に含まれている非磁性粉末に対し吸着しやすいために
非磁性層から磁性層表面へは出てきにくいが、非磁性粉
末に吸着せずに遊離した状態の脂肪酸アミド及び脂肪酸
エステルは、構造上比較的容易に動くことができ、しか
も、脂肪酸アミドが脂肪酸を同伴する効果が強いため、
非磁性層から徐々に磁性層表面上に出てくるためと考え
られる。このような脂肪酸、脂肪酸アミド及び脂肪酸エ
ステルの移行の効果は、非磁性層に脂肪酸アミドが適量
入っていることによってのみ現れる。非磁性層から移行
すると考えられる分の脂肪酸と脂肪酸アミドを予め磁性
層に入れておいてもこのような効果は得られない。
[0008] The reason why the above effects occur is not clear,
In general, fatty acids contained in the nonmagnetic layer are less likely to come out of the nonmagnetic layer to the surface of the magnetic layer because they are easily adsorbed by the nonmagnetic powder contained in the nonmagnetic layer. Fatty acid amides and fatty acid esters that are released without being adsorbed on the powder can move relatively easily in structure, and since the fatty acid amide has a strong effect of entraining fatty acids,
It is considered that this gradually emerges from the nonmagnetic layer onto the surface of the magnetic layer. Such an effect of transferring fatty acids, fatty acid amides and fatty acid esters appears only when a suitable amount of fatty acid amide is contained in the nonmagnetic layer. Such an effect cannot be obtained even if fatty acids and fatty acid amides which are considered to migrate from the nonmagnetic layer are put in the magnetic layer in advance.

【0009】前記潤滑剤総量が非磁性粉100重量部に対し
1.0重量部より少ないと目的とする耐久性を得ること
が出来ず、2.3重量部より多いと過剰になった潤滑剤
によりヘッド付着が悪くなる。また脂肪酸が0.2重量
部未満では耐久性が悪化し、1.0重量部を超えるとヘ
ッド付着が悪化してくる。脂肪酸アミドが0.1重量部
未満の場合には、上記脂肪酸の同伴効果が得られなくな
り、耐久性の悪化が発生し、0.5重量部を超えると、
過剰となった脂肪酸アミドが磁性層表面に吐出してく
る。脂肪酸エステルが0.5重量部未満の場合も上記脂
肪酸の同伴効果が得られなくなり耐久性が悪化する。一
方1.0重量部を超えると非磁性層が可塑化してくるた
めやはり耐久性が悪化してくる。
If the total amount of the lubricant is less than 1.0 part by weight with respect to 100 parts by weight of the non-magnetic powder, the intended durability cannot be obtained, and if the total amount is more than 2.3 parts by weight, the lubricant becomes excessive. Causes poor head adhesion. If the fatty acid content is less than 0.2 parts by weight, the durability deteriorates, and if the fatty acid content exceeds 1.0 parts by weight, the head adhesion deteriorates. When the fatty acid amide is less than 0.1 part by weight, the entrainment effect of the fatty acid cannot be obtained, and deterioration of durability occurs.
Excess fatty acid amide is discharged onto the surface of the magnetic layer. When the amount of the fatty acid ester is less than 0.5 part by weight, the entrainment effect of the fatty acid cannot be obtained, and the durability is deteriorated. On the other hand, if it exceeds 1.0 part by weight, the nonmagnetic layer is plasticized, so that the durability also deteriorates.

【0010】本発明に用いることができる脂肪酸アミドとし
ては、ラウリン酸アミド、ミリスチン酸アミド、パルミ
チン酸アミド、ステアリン酸アミドが挙げられる。特に
ステアリン酸アミド(以下「SAA」と略記することも
ある。)とパルミチン酸アミド(PAA)を用いると本
発明の効果をより良好に発揮することができる。脂肪酸
アミドとしては一種のみを用いても良いが、ステアリン
酸アミドとパルミチン酸アミドを混合して用いてもよ
く、ステアリン酸アミド/パルミチン酸アミドの重量比
が60/40〜80/20であるものは工業的に入手が
容易であり好ましく用いることができる。また脂肪酸と
しては、ラウリン酸、ミリスチン酸(MA)、パルミチ
ン酸、ステアリン酸(SA)、オレイン酸、リノール
酸、リノレン酸、ベヘン酸、エルカ酸、エライジン酸等
を挙げることができ、ステアリン酸、ミリスチン酸、パ
ルミチン酸が好ましい。特にステアリン酸は耐久性の向
上に有効である。脂肪酸エステルとしては、ミリスチン
酸ブチル、パルミチン酸ブチル(BP)、ステアリン酸
ブチル(BS)、ネオペンチルグリコールジオレエー
ト、ソルビタンモノステアレート、ソルビタンジステア
レート、ソルビタントリステアレート、オレイン酸オレ
イル、ステアリン酸イソセチル、ステアリン酸イソトリ
デシル、ステアリン酸オクチル、ステアリン酸イソオク
チル、ステアリン酸アミル、ステアリン酸ブトキシエチ
ル等が挙げられるが、例えば、脂肪酸としてステアリン
酸を用いる場合には、脂肪酸由来成分がステアリン酸で
あるものが上記脂肪酸の同伴効果が得られやすく好まし
い。これは、脂肪酸アミドについても同様である。更に
ステアリン酸ブチルは構造が比較的単純であり非磁性層
や磁性層中で容易に移動できるため、非磁性層から磁性
層への移行時に、上記ステアリン酸を同伴する効果が高
いステアリン酸アミドと共に用いると本発明の効果を得
やすい。
[0010] Examples of the fatty acid amide that can be used in the present invention include lauric amide, myristic amide, palmitic amide, and stearic amide. In particular, the use of stearic acid amide (hereinafter sometimes abbreviated as "SAA") and palmitic acid amide (PAA) can more effectively exert the effects of the present invention. As the fatty acid amide, only one kind may be used, but a mixture of stearic acid amide and palmitic acid amide may be used, and the weight ratio of stearic acid amide / palmitic acid amide is 60/40 to 80/20. Is easily available industrially and can be preferably used. Examples of fatty acids include lauric acid, myristic acid (MA), palmitic acid, stearic acid (SA), oleic acid, linoleic acid, linolenic acid, behenic acid, erucic acid, and elaidic acid. Myristic acid and palmitic acid are preferred. In particular, stearic acid is effective for improving durability. Fatty acid esters include butyl myristate, butyl palmitate (BP), butyl stearate (BS), neopentyl glycol dioleate, sorbitan monostearate, sorbitan distearate, sorbitan tristearate, oleyl oleate, stearin Isocetyl acid, isotridecyl stearate, octyl stearate, isooctyl stearate, amyl stearate, butoxyethyl stearate, and the like.For example, when stearic acid is used as a fatty acid, the fatty acid-derived component is stearic acid. Is preferred since the entrainment effect of the above fatty acids can be easily obtained. This is the same for fatty acid amides. Further, since butyl stearate has a relatively simple structure and can easily move in a nonmagnetic layer or a magnetic layer, it has a high effect of entraining stearic acid at the time of transition from the nonmagnetic layer to the magnetic layer. When used, the effect of the present invention is easily obtained.

【0011】本発明においては、非磁性層に含まれる非磁性
粉末として、α酸化鉄及び/又はカーボンブラックが好
ましい。α酸化鉄は更に、Al又はSiで表面処理され
ていることが好ましく、カーボンブラックの比表面積
(BET値)が40〜70m2/g、平均粒径25〜4
0nm、DBP吸油量40〜55cc/100gである
ことが好ましい。このようにすることにより上記同伴効
果をより発揮することが可能となる。又、磁性層の膜厚
は乾燥厚で0.2μm以下、好ましくは0.20〜0.
05μmである。又、非磁性層の乾燥膜厚は0.4〜
2.0μmが好ましい。これらの厚み構成とすることに
より上記同伴効果を得ることが容易となる。本発明に用
いられる強磁性粉末としては、従来から公知である磁性
粉を使用することが可能で、磁気記録装置に適した保磁
力、粒径の磁性粉を用いることが出来るが、近年の磁気
記録媒体に求められる特性を得るためには、特にFeを
主体とした強磁性合金粉末は保磁力、飽和磁化量も大き
く媒体設計においてより効果的である。
In the present invention, α-iron oxide and / or carbon black are preferable as the nonmagnetic powder contained in the nonmagnetic layer. The α-iron oxide is preferably further surface-treated with Al or Si, has a specific surface area (BET value) of carbon black of 40 to 70 m 2 / g, and an average particle size of 25 to 4
It is preferably 0 nm and the DBP oil absorption is 40 to 55 cc / 100 g. By doing so, it is possible to exhibit the above-mentioned entrainment effect more. The thickness of the magnetic layer is 0.2 μm or less in terms of dry thickness, preferably 0.20 to 0.2 μm.
05 μm. The dry film thickness of the non-magnetic layer is 0.4 to
2.0 μm is preferred. With such a thickness configuration, it is easy to obtain the above-described entrainment effect. As the ferromagnetic powder used in the present invention, a conventionally known magnetic powder can be used, and a magnetic powder having a coercive force and a particle size suitable for a magnetic recording device can be used. In order to obtain the characteristics required for a recording medium, in particular, a ferromagnetic alloy powder mainly composed of Fe has a large coercive force and a large saturation magnetization, and is more effective in medium design.

【0012】本発明に用いられるその他の非磁性粉、結合
剤、研磨材、分散剤、カーボン、硬化剤は従来から公知
の物が使用でき、また、製造方法(分散方式、塗布方式
など)についても、従来からの公知の技術を用いること
が出来る。
As the other non-magnetic powder, binder, abrasive, dispersant, carbon and hardener used in the present invention, conventionally known substances can be used, and the production method (dispersion method, coating method, etc.) can be used. Also, a conventionally known technique can be used.

【実施例】以下、本発明の具体的実施例を比較例と共に
説明する。次のような組成の非磁性層、磁性層とバック
コート層を具備した磁気記録媒体を作製した。 (実施例1)非磁性層形成のための非磁性塗料を調整し
た。 <非磁性層形成のための非磁性塗料組成> 非磁性粉末(戸田工業製 DPN250BW) 針状α酸化鉄…75重量部 Al/SiO2:0.16/0.23重量部 BET値:53m2/g pH:5.5 可溶性Na量:24ppm 可溶性Ca量:9ppm 嵩密度:0.7g/ml 長軸長:0.15μm 短軸長:0.03μm カーボンブラック(コロンビヤンカーボン製 RavenR76
0B)…25重量部 平均粒径30nm BET63m2/g DBP吸油量48cc/100g 樹脂(東洋紡製 TB0246)…9重量部 塩化ヒ゛ニル-エホ゜キシ含有モノマー共重合体(電子線硬化型樹脂) 平均重合度:310エホ゜キシ 含有量:3重量部 過硫酸カリ使用S含有量:0.6重量部 2−イソシアネートエチルメタクリレート(MOI)を
使用して、日本ゼオン社製MR110をアクリル変性し
たもの、 アクリル含有量:6モル/1モル 樹脂(東洋紡 TB0216)…9重量部 ポリウレタン(電子線硬化型樹脂) ヒドロキシ含有アクリル化合物−ホスホン酸基含有リン
化合物− ヒドロキシ含有ポリエステルポリオール Tg 15℃ 分散剤(東邦化学 RE610)…3重量部 有機リン酸化合物 研磨剤(住友化学 HIT60A)…5重量部 αアルミナ 平均粒径 0.22μm メチルエチルケトン…100重量部 トルエン…100重量部 シクロヘキサノン…40重量部 この組成物をニーダーにて十分に混練した後、横型のピ
ンミルにて分散を行った。その後に、下記の組成物を投
入し、更に1時間分散を行った。 脂肪酸(日本油脂 NAA180、ステアリン酸)…
0.4重量部 脂肪酸エステル(日本精化 BS−S、ステアリン酸ブ
チル)…0.8重量部 脂肪酸アミド(花王 脂肪酸アマイドS)…0.2重量
部 ステアリン酸アミド=70 パルミチン酸アミド=30混合品 メチルエチルケトン…30重量部 トルエン…30重量部 シクロヘキサノン…15重量部 このようにして得られた非磁性塗料を更に平均孔径0.
3μmのフィルターで濾過して非磁性塗料を作製した。
EXAMPLES Hereinafter, specific examples of the present invention will be described together with comparative examples. A magnetic recording medium having a nonmagnetic layer, a magnetic layer, and a back coat layer having the following composition was produced. (Example 1) A non-magnetic paint for forming a non-magnetic layer was prepared. <Non-magnetic coating composition for forming non-magnetic layer> Non-magnetic powder (DPN250BW manufactured by Toda Kogyo) Acicular α iron oxide: 75 parts by weight Al / SiO 2 : 0.16 / 0.23 parts by weight BET value: 53 m 2 / G pH: 5.5 Soluble Na content: 24 ppm Soluble Ca content: 9 ppm Bulk density: 0.7 g / ml Long axis length: 0.15 μm Short axis length: 0.03 μm Carbon black (RavenR76 manufactured by Colombian Carbon)
0B): 25 parts by weight Average particle size: 30 nm BET 63 m 2 / g DBP oil absorption: 48 cc / 100 g Resin (TB0246 manufactured by Toyobo): 9 parts by weight Vinyl chloride-ethoxylated monomer copolymer (electron beam-curable resin) Average polymerization degree: 310 ethoxy content: 3 parts by weight Potassium persulfate S content: 0.6 parts by weight Acrylic modification of MR110 manufactured by Zeon Corporation using 2-isocyanatoethyl methacrylate (MOI), acrylic content: 6 Mol / 1 mol Resin (Toyobo TB0216) 9 parts by weight Polyurethane (electron beam-curable resin) Hydroxy-containing acrylic compound-phosphonic acid group-containing phosphorus compound-hydroxy-containing polyester polyol Tg 15 ° C. Dispersant (Toho Chemical RE610) 3 parts by weight Part Organic phosphate compound abrasive (Sumitomo Chemical HIT60 5 parts by weight α-alumina Average particle size 0.22 μm Methyl ethyl ketone 100 parts by weight Toluene 100 parts by weight Cyclohexanone 40 parts by weight After sufficiently kneading this composition with a kneader, it was dispersed by a horizontal pin mill. . Thereafter, the following composition was charged, and the mixture was further dispersed for 1 hour. Fatty acids (Nippon Oil and Fat NAA180, stearic acid) ...
0.4 parts by weight Fatty acid ester (Nippon Seika BS-S, butyl stearate) ... 0.8 parts by weight Fatty acid amide (Kao fatty acid amide S) ... 0.2 parts by weight Stearic acid amide = 70 Palmitic acid amide = 30 mixture Product Methyl ethyl ketone: 30 parts by weight Toluene: 30 parts by weight Cyclohexanone: 15 parts by weight
The mixture was filtered through a 3 μm filter to prepare a non-magnetic paint.

【0013】次に磁性層形成のための磁性塗料を調整した。 <磁性層形成のための磁性塗料組成> 強磁性粉(Fe系針状磁性紛)…100重量部 Co/Al/Y=30重量部/4.7重量部/4.8重量部(Fe100重
量部に対して) Hc:187kA/m(2370Oe) σs:155Am2/kg BET値:48m2/g 長軸長:0.10μm 結晶子サイズ:160Å pH:9.5 樹脂(日本ゼオン MR110)…8重量部 塩化ビニル共重合体 塩ヒ゛/2HEMA/AGE/分子末端OSO3K:84.5/4.5/7.4/0.36
(重量比) 樹脂(東洋紡 UR8200)…5重量部ホ゜リエステルホ゜リウレタン SO3Na基含有 分子量(Mn):2万 分散剤(東邦化学 RE610、有機リン酸化合物)…
3重量部 研磨剤(住友化学 HIT82、αアルミナ)…3重量
部 平均粒径 0.09μm メチルエチルケトン…100重量部 トルエン…100重量部 シクロヘキサノン…40重量部 この組成物をニーダーにて十分に混練した後、横型のピ
ンミルにて分散を行った。その後に、下記の組成物を投
入し、更に1時間分散を行った。 脂肪酸(日本油脂 NAA180、ステアリン酸)…
1.2重量部 脂肪酸エステル(日本精化 BS−S、ステアリン酸ブ
チル)…1.0重量部 メチルエチルケトン…80重量部 トルエン…80重量部 シクロヘキサノン…220重量部 このようにして得られた磁性塗料に硬化剤(日本ポリウ
レタン C−3041、トリメチロールフ゜ロハ゜ンのTDI(トリレンシ゛イソ
シアネート)の3分子アタ゛クト体)3重量部添加混合し、このも
のを更に平均孔径0.04μmのフィルターで濾過して
磁性塗料を作製した。
Next, a magnetic paint for forming a magnetic layer was prepared. <Magnetic coating composition for forming magnetic layer> Ferromagnetic powder (Fe-based acicular magnetic powder): 100 parts by weight Co / Al / Y = 30 parts by weight / 4.7 parts by weight / 4.8 parts by weight (based on 100 parts by weight of Fe) ) Hc: 187 kA / m (2370 Oe) σs: 155 Am 2 / kg BET value: 48 m 2 / g Long axis length: 0.10 μm Crystallite size: 160 : pH: 9.5 Resin (ZEON MR110): 8 parts by weight Chloride Vinyl copolymer salt II / 2HEMA / AGE / molecular terminal OSO 3 K: 84.5 / 4.5 / 7.4 / 0.36
(Weight ratio) Resin (Toyobo UR8200) 5 parts by weight Polyester polyurethane Urethane SO 3 Na group-containing molecular weight (Mn): 20,000 Dispersant (Toho Chemical RE610, organic phosphoric acid compound)
3 parts by weight Abrasive (Sumitomo Chemical HIT82, α-alumina) 3 parts by weight Average particle size 0.09 μm Methyl ethyl ketone 100 parts by weight Toluene 100 parts by weight Cyclohexanone 40 parts by weight After sufficiently kneading this composition in a kneader. Dispersion was performed with a horizontal pin mill. Thereafter, the following composition was charged, and the mixture was further dispersed for 1 hour. Fatty acids (Nippon Oil and Fat NAA180, stearic acid) ...
1.2 parts by weight Fatty acid ester (Nippon Seika BS-S, butyl stearate) 1.0 part by weight Methyl ethyl ketone 80 parts by weight Toluene 80 parts by weight Cyclohexanone 220 parts by weight To the magnetic coating material thus obtained, 3 parts by weight of a curing agent (Nippon Polyurethane C-3041, trimethylol isocyanate trimethylol isocyanate 3 parts by weight) were added and mixed, and the mixture was further filtered through a filter having an average pore diameter of 0.04 μm to obtain a magnetic paint. Produced.

【0014】ついで、下記バックコート層形成のための塗料
を作製した。 <バックコート層形成のための塗料組成物> カーボンブラック(キャボット製 BP−800)…1
00重量部 平均粒径17nm BET210m2/g カーボンブラック(コロンビアンカーボン製 セバカー
ブMT)…0.2重量部 サーマルカーボン 粒径:350nm BET値:7m2/g 樹脂(旭化成 BTH1/2、ニトロセルロース)…8
0重量部 樹脂(東洋紡績 UR―8700)…40重量部 ポリウレタン SO3Na含有 メチルエチルケトン…150重量部 トルエン…150重量部 シクロヘキサノン…80重量部 この組成物をニーダーにて十分に混練した後、サンドグ
ラインドミルにて分散を行った。その後に、下記の組成
物を投入し、更に分散を行った。 メチルエチルケトン…400重量部 トルエン…400重量部 シクロヘキサノン…200重量部 このようにして得られたバックコート塗料に硬化剤(日
本ポリウレタン C−3041、トリメチロールフ゜ロハ゜ンのTDIの
3分子アタ゛クト体)20重量部添加混合し、このものを更
に平均孔径0.5μmのフィルターで濾過してバックコ
ート塗料を作製した。
Next, the following paint for forming a back coat layer was prepared. <Coating composition for forming back coat layer> Carbon black (BP-800 manufactured by Cabot) ... 1
00 parts by weight Average particle size: 17 nm BET210 m 2 / g Carbon black (Sebacarb MT manufactured by Columbian Carbon) 0.2 parts by weight Thermal carbon Particle size: 350 nm BET value: 7 m 2 / g Resin (Asahi Kasei BTH1 / 2, nitrocellulose) … 8
0 parts by weight Resin (Toyobo UR-8700): 40 parts by weight Polyurethane SO 3 Na-containing methyl ethyl ketone: 150 parts by weight Toluene: 150 parts by weight Cyclohexanone: 80 parts by weight After sufficiently kneading this composition with a kneader, sand grinding is performed. Dispersion was performed in a mill. Thereafter, the following composition was charged and further dispersed. Methyl ethyl ketone: 400 parts by weight Toluene: 400 parts by weight Cyclohexanone: 200 parts by weight 20 parts by weight of a curing agent (Nippon Polyurethane C-3041, trimethylol tripropane TDI three-molecule reactant) are added to the backcoat paint thus obtained. After mixing, the mixture was filtered through a filter having an average pore size of 0.5 μm to prepare a back coat paint.

【0015】このようにして得られた非磁性層形成用の塗料
と磁性層形成用の塗料とバックコート層形成のための塗
料を用いて、下記の要領で磁気記録媒体のサンプルを作
製した。 (塗布)4.4μmのポリアラミド支持体上に、乾燥、
カレンダー加工後の厚みが0.7μmになるように非磁
性層形成用塗料をノズルで塗布した。その後、温度10
0℃、線圧2940N/cm(300kg/cm)、3
ニップの条件でカレンダー加工を行い、さらに電子線照
射装置により4.5MradでEB照射を行った。この
時下層の表面粗さ(Ra)は3.5nmであった。こう
して形成した非磁性層上に、磁性層を加工後厚みが0.
15μmになるようにノズルで塗布を行い、0.7T
(テスラ)の配向磁石を印加して、その後塗膜を乾燥
し、次いで温度100℃、線圧2550N/cm(26
0kg/cm)、3ニップの条件でカレンダリング加工
おこなった。
Using the thus obtained paint for forming a non-magnetic layer, the paint for forming a magnetic layer, and the paint for forming a back coat layer, a sample of a magnetic recording medium was prepared in the following manner. (Coating) Drying on a 4.4 μm polyaramide support,
The coating material for forming a nonmagnetic layer was applied by a nozzle so that the thickness after calendering became 0.7 μm. After that, the temperature 10
0 ° C, linear pressure 2940 N / cm (300 kg / cm), 3
Calendar processing was performed under the nip condition, and EB irradiation was performed at 4.5 Mrad by an electron beam irradiation apparatus. At this time, the surface roughness (Ra) of the lower layer was 3.5 nm. On the non-magnetic layer thus formed, the magnetic layer is processed to have a thickness of 0.3 mm.
Apply with a nozzle to a thickness of 15 μm, and apply 0.7 T
(Tesla) oriented magnet is applied, then the coating film is dried, and then at a temperature of 100 ° C. and a linear pressure of 2550 N / cm (26
(0 kg / cm) and calendering was performed under the condition of 3 nips.

【0016】このような磁性層形成の面とは反対側の支持体
の面上に、上記バックコート層形成用の塗料を厚さ0.
5μmとなるようにノズルで塗布し、その後塗膜を乾燥
し、次いで温度90℃、線圧2058N/cm(210
kg/cm)、3ニップの条件でカレンダー加工をおこ
なった。このような一連の処理が完了した磁気記録媒体
フィルムを巻き取りロールに巻き取った。このままの状
態で24時間放置し、その後、熱硬化処理を60℃にて
24時間おこなった。
On the surface of the support opposite to the surface on which such a magnetic layer is formed, the above-mentioned coating material for forming a back coat layer is coated to a thickness of 0.1 mm.
It was applied to a nozzle so as to have a thickness of 5 μm, then the coating was dried, and then the temperature was 90 ° C. and the linear pressure was 2058 N / cm (210
(kg / cm) and calendering was performed under the condition of 3 nips. The magnetic recording medium film having undergone such a series of processing was wound up on a take-up roll. This was left as it was for 24 hours, and then a thermosetting treatment was performed at 60 ° C. for 24 hours.

【0017】このようにして作製された磁気記録媒体フィル
ムをスリッタにかけ、3.81mm幅に切断し、磁気テ
ープサンプルを作製した。 (実施例2〜11、比較例1〜7)表1に示すように、
非磁性層中の脂肪酸、脂肪酸アミド、脂肪酸エステルの
量を変えた以外は実施例1と同様に磁気テープサンプル
を作成した。尚、実施例6と7及び比較例5と7は磁性
層中の潤滑剤量も表1に示すように変更した。また、実
施例1以外は脂肪酸アミドとして単一成分のものを用い
た。
The magnetic recording medium film thus produced was slit into 3.81 mm width pieces by slitting to prepare magnetic tape samples. (Examples 2 to 11, Comparative Examples 1 to 7) As shown in Table 1,
A magnetic tape sample was prepared in the same manner as in Example 1 except that the amounts of the fatty acid, fatty acid amide, and fatty acid ester in the nonmagnetic layer were changed. In Examples 6 and 7 and Comparative Examples 5 and 7, the amount of the lubricant in the magnetic layer was also changed as shown in Table 1. Except for Example 1, a single component fatty acid amide was used.

【0018】このようにして作製した実施例1〜6、及び比
較例1〜7の磁気テープについて下記の要領で(1)耐
久性、(2)ヘッド付着、(3)吐出の評価を行った。 (1)耐久性 3.81mmフォーマットのSony社製データドライブ
SDT−10000にての耐久性評価を行った。耐久性
は磁気テープの一部分をWrite/Readする方法で2000
回を上限として行い、それ以下の回数で止まった場合は
その回数を表1に表示した。 (2)ヘッド付着 3.81mmフォーマットのSony社製データドライブ
SDT−10000にて長さ155mの磁気テープを1
回ずつ連続6巻走行させ、走行後のヘッドを(株)キー
エンス社製のマイクロスコープにて観察し、ヘッド汚れ
の評価をおこなった。 ヘッド付着の評価基準は以下の通り。 ◎ヘッドに付着のない場合。 ○ヘッド摺動面に付着物がない場合。 ×ヘッド摺動面に付着物が有る場合。 (3)吐出 50℃80RHの環境に設定された恒温槽中に5日間テ
ープを保存し、保存後のテープの表面を顕微鏡にて観察
し吐出の有無の確認を行った。
The magnetic tapes of Examples 1 to 6 and Comparative Examples 1 to 7 thus manufactured were evaluated for (1) durability, (2) head adhesion, and (3) ejection in the following manner. . (1) Durability Durability was evaluated using a 3.81 mm format data drive SDT-10000 manufactured by Sony. Durability is 2000 by writing / reading a part of magnetic tape.
The number of times was set as the upper limit, and when the number of stops was less than that, the number of times is shown in Table 1. (2) Attachment of head A 155 m long magnetic tape was attached to a 3.81 mm format Sony data drive SDT-10000 using
The head was run continuously six times each time, and the head after running was observed with a microscope manufactured by KEYENCE CORPORATION to evaluate head contamination. The evaluation criteria for head adhesion are as follows. ◎ When there is no adhesion to the head. ○ When there is no deposit on the head sliding surface. X When there is a deposit on the head sliding surface. (3) Discharge The tape was stored in a constant temperature bath set at an environment of 50 ° C. and 80 RH for 5 days, and the surface of the tape after storage was observed with a microscope to confirm the presence or absence of discharge.

【0019】吐出の評価基準は以下の通り ○テープ上に吐出のない場合。 △テープ上の一部に僅かに吐出がある場合。 ×テープ上全面に吐出がある場合。 以上の評価結果を表1にしめす。The evaluation criteria for ejection are as follows: ○ No ejection on tape. △ When there is a slight discharge on a part of the tape. X When ejection is on the entire surface of the tape. Table 1 shows the above evaluation results.

【表1】 [Table 1]

【0020】上記表1において、SA=ステアリン酸、SA
A=ステアリン酸アミド、BS=ステアリン酸ブチルを
表し、*1はSAA/PAA=70/30(重量比、P
AA=パルチミン酸)の混合物を表し、SAの欄の括弧
は、SAに代えてミリスチン酸を、BSの欄の括弧は、
BSに代えてパルチミン酸ブチルを、また、SAAの欄
の括弧は、SAAに代えてパルチミン酸アミドを用いた
ことを表している。
In the above Table 1, SA = stearic acid, SA
A = stearic acid amide, BS = butyl stearate, * 1 is SAA / PAA = 70/30 (weight ratio, P
AA = partimic acid), the parentheses in the column of SA are myristic acid in place of SA, and the parentheses in the column of BS are
Butyl palmitate was used in place of BS, and parentheses in the column of SAA indicate that palmitamide was used in place of SAA.

【0021】[0021]

【発明の効果】表1から明らかなように、本発明の範囲
の実施例は磁性層表面に吐出がなく、ヘッド付着がな
く、耐久性に優れている。
As is clear from Table 1, the embodiments within the scope of the present invention have no discharge on the surface of the magnetic layer, no head adhesion, and have excellent durability.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 井上 修 東京都中央区日本橋一丁目13番1号 ティ ーディーケイ株式会社内 Fターム(参考) 5D006 CA04 FA02  ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Osamu Inoue 1-13-1, Nihonbashi, Chuo-ku, Tokyo FTD term (reference) 5D006 CA04 FA02

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】非磁性支持体上に、非磁性粉末と結合剤を
主として含む膜厚0.4〜2.0μmの非磁性層を有し、
その上に膜厚0.2μm以下の磁性層を有する磁気記録
媒体において、該非磁性層中に脂肪酸、脂肪酸アミド、
脂肪酸エステルを含んだことを特徴とする磁気記録媒
体。
1. A nonmagnetic layer having a thickness of 0.4 to 2.0 μm mainly containing a nonmagnetic powder and a binder on a nonmagnetic support,
In a magnetic recording medium having thereon a magnetic layer having a thickness of 0.2 μm or less, a fatty acid, a fatty acid amide,
A magnetic recording medium comprising a fatty acid ester.
【請求項2】非磁性粉末100重量部に対して非磁性層
中の脂肪酸、脂肪酸アミド、脂肪酸エステルの総量が
1.0〜2.3重量部、脂肪酸が0.2〜1.0重量
部、脂肪酸アミドが0.1〜0.5重量部、脂肪酸エス
テルが0.5〜1.0重量部であることを特徴とする請
求項1に記載の磁気記録媒体。
2. The total amount of fatty acids, fatty acid amides, and fatty acid esters in the nonmagnetic layer is 1.0 to 2.3 parts by weight, and the fatty acid is 0.2 to 1.0 parts by weight, based on 100 parts by weight of the nonmagnetic powder. 2. The magnetic recording medium according to claim 1, wherein the fatty acid amide is 0.1 to 0.5 part by weight and the fatty acid ester is 0.5 to 1.0 part by weight.
【請求項3】脂肪酸がステアリン酸、脂肪酸アミドがス
テアリン酸アミド、脂肪酸エステルがステアリン酸ブチ
ルであることを特徴とする請求項1又は2に記載の磁気
記録媒体。
3. The magnetic recording medium according to claim 1, wherein the fatty acid is stearic acid, the fatty acid amide is stearic acid amide, and the fatty acid ester is butyl stearate.
【請求項4】非磁性粉末がα酸化鉄及び/又はカーボン
ブラックを含むことを特徴とする請求項1、2又は3に
記載の磁気記録媒体。
4. The magnetic recording medium according to claim 1, wherein the non-magnetic powder contains α-iron oxide and / or carbon black.
【請求項5】α酸化鉄がAl又はSiにより表面処理さ
れていることを特徴とする請求項4に記載の磁気記録媒
体。
5. The magnetic recording medium according to claim 4, wherein the α-iron oxide is surface-treated with Al or Si.
【請求項6】カーボンブラックのBET法による比表面
積(BET値)が40〜70m2/g、平均粒径25〜
40nm、DBP吸油量が40〜55cc/100gで
あることを特徴とする請求項4又は5に記載の磁気記録
媒体。
6. The carbon black has a specific surface area (BET value) determined by a BET method of 40 to 70 m 2 / g and an average particle size of 25 to 25.
6. The magnetic recording medium according to claim 4, wherein the magnetic recording medium has a DBP oil absorption of 40 to 55 cc / 100 g.
JP2000339817A 1999-11-08 2000-11-08 Magnetic recording medium Expired - Fee Related JP4507042B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7722969B2 (en) 2004-04-19 2010-05-25 Hitachi Maxell, Ltd. Magnetic tape

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0335417A (en) * 1989-06-30 1991-02-15 Fuji Photo Film Co Ltd Magnetic recording medium
JPH07334835A (en) * 1994-06-08 1995-12-22 Konica Corp Magnetic recording medium
JPH09251631A (en) * 1997-02-08 1997-09-22 Hitachi Maxell Ltd Magnetic recording medium and its manufacture
JPH11175957A (en) * 1997-12-09 1999-07-02 Tdk Corp Magnetic recording medium
JPH11296842A (en) * 1998-04-02 1999-10-29 Sony Corp Magnetic recording medium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0335417A (en) * 1989-06-30 1991-02-15 Fuji Photo Film Co Ltd Magnetic recording medium
JPH07334835A (en) * 1994-06-08 1995-12-22 Konica Corp Magnetic recording medium
JPH09251631A (en) * 1997-02-08 1997-09-22 Hitachi Maxell Ltd Magnetic recording medium and its manufacture
JPH11175957A (en) * 1997-12-09 1999-07-02 Tdk Corp Magnetic recording medium
JPH11296842A (en) * 1998-04-02 1999-10-29 Sony Corp Magnetic recording medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7722969B2 (en) 2004-04-19 2010-05-25 Hitachi Maxell, Ltd. Magnetic tape

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