JPH0427609B2 - - Google Patents
Info
- Publication number
- JPH0427609B2 JPH0427609B2 JP56039848A JP3984881A JPH0427609B2 JP H0427609 B2 JPH0427609 B2 JP H0427609B2 JP 56039848 A JP56039848 A JP 56039848A JP 3984881 A JP3984881 A JP 3984881A JP H0427609 B2 JPH0427609 B2 JP H0427609B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- integer
- powder
- dispersant
- lubricant
- 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 - Lifetime
Links
- 239000006247 magnetic powder Substances 0.000 claims description 12
- 239000002270 dispersing agent Substances 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 7
- 239000000314 lubricant Substances 0.000 claims description 7
- 229920001296 polysiloxane Polymers 0.000 claims description 6
- -1 alkyl phosphate ester Chemical class 0.000 claims description 5
- 229920000233 poly(alkylene oxides) Polymers 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- 125000004432 carbon atom Chemical group C* 0.000 claims description 3
- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 229930195734 saturated hydrocarbon Natural products 0.000 claims description 2
- 229930195735 unsaturated hydrocarbon Natural products 0.000 claims description 2
- 239000000843 powder Substances 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 229920006267 polyester film Polymers 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- YGGXZTQSGNFKPJ-UHFFFAOYSA-N methyl 2-naphthalen-1-ylacetate Chemical compound C1=CC=C2C(CC(=O)OC)=CC=CC2=C1 YGGXZTQSGNFKPJ-UHFFFAOYSA-N 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 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
- G11B5/71—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 lubricant
Landscapes
- Lubricants (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
この発明は磁性粉末の分散性にすぐれ、かつ耐
久性および耐熱性の改善された磁気記録媒体に関
する。
磁気記録媒体の磁性層は、一般に、磁性粉とそ
の結合剤とを溶解分散させた磁性塗料をポリエス
テルフイルムの如き基体上に塗着することによつ
て形成される。このように形成される磁性層の磁
気特性ないし電磁変換特性は、主に磁性粉の分散
状態に左右される。従来より、かかる分散性を改
善するために磁性塗料中に種々の分散剤を添加す
る試みがなされている。
ポリアルキレンオキサイドアルキル燐酸エステ
ルまたはその塩は、上記分散剤として効果的に作
用し、磁性粉の充てん性や配向性を改良してすぐ
れた磁気特性ないし電磁変換特性を附与すること
が知られている。ところが、上記の分散剤を用い
た場合、磁性粉と結合剤樹脂との結合力が低下し
たり、あるいは分散剤が磁性層表面に滲出しやす
くなるなどの欠点がある。このため、粉落ちが目
立ち、出力変動が大となり、またテープ鳴きを生
じるなど耐久特性に劣つたものとなる。また、層
間粘着を引きおこす如き耐熱特性にも乏しいもの
となる。
一方、上記の問題に対処して、かかる磁性層中
にシリコーンオイルや弗素オイルの如き一般の潤
滑剤を配合する試みがなされており、これによつ
て耐久性や耐熱性の改善効果が得られているが、
この場合上記潤滑剤と前記の分散剤および結合剤
との相溶性が悪いため、分散性に悪影響をおよぼ
し、磁気特性ないし電磁変換特性を低下させる憾
みがあつた。
この発明の磁気記録媒体は、上記の観点から、
分散剤としてポリアルキレンオキサイドアルキル
燐酸エステルまたはその塩を用いた磁性塗料中
に、潤滑剤として特定の脂肪酸変性シリコーン化
合物を添加し、これをポリエステルフイルムの如
き基体上に塗着してなるものであり、上記の潤滑
剤を使用したことによつて、磁性粉末の分散性を
損なうことなく、磁性層の耐久性および耐熱性を
改善できることが見い出された。
この発明で用いる脂肪酸変性シリコーン化合物
は、つぎの一般式
（式中、y1，y2は−CH3または−OCOR、Ｒは
炭素数７〜21の飽和もしくは不飽和の炭化水素
基、n1は40〜100の整数、n2は５〜20の整数、n1
＋n2は45〜120である）
で表わされるものである。この種の化合物は、
種々の結合剤および前記の分散剤と適度に相溶す
るため、磁性粉末の分散性を損なうおそれがな
く、磁気特性ないし電磁変換特性に好結果を与え
る一方、前記の分散剤の欠点とされた耐久性およ
び耐熱性を改善し、テープ走行中の粉落ちや出力
変動を低下させ、またテープ鳴きや層間粘着を効
果的に防止する。
上記の潤滑剤と併用されるポリアルキレンオキ
サイドアルキル燐酸エステルまたはその塩は、つ
ぎの一般式；
にて表わされるものであり、式中、R1，R2，R3
は炭素数１〜32の炭化水素基、R4，R5，R6は水
素原子、メチル基またはエチル基、M1，M2は水
素原子、一価の金属または−Ｎ（R7）q（R8）4-qで
ある。また、上記のR7，R8は水素原子、メチル
基またはエチル基を示し、ｍ，ｎおよびｐは１〜
60の整数、ｑは１〜４の整数である。
このようなポリアルキレンオキサイドアルキル
燐酸エステルまたはその塩の市販品としては、東
邦化学工業社製のGAFAC−RE410、同RE610、
同RS410（一般式中のR1，R2，R3が−CH2（CH2）
11CH3，R4，R5，R6，M1，M2が水素原子、ｍ，
ｎ，ｐが３）、同RS710、同LO−529などが挙げ
られる。
上に述べた潤滑剤および分散剤の使用量は、磁
性粉100重量部に対してそれぞれ0.1〜５重量部と
するのがよく、これらの量が多くなりすぎると、
分散性低下やブリードアウトをおこして出力低下
をきたすなどの支障をきたすおそれがある。
この発明に適用される磁性粉には、γ−Fe2
O3、Fe3O4、これらの中間的な酸化鉄粉末、Co
を含有させた酸化鉄粉末などの磁性酸化物粉末の
ほか、Fe，Niあるいはこれらの合金の如き金属
磁性粉末がいずれも使用できる。また、結合剤も
従来公知の各種樹脂がいずれも適用可能である。
つぎに、この発明の実施例を記載する。以下に
おいて、部とあるは重量部を意味するものとす
る。
実施例 １
Co含有のγ−Fe2O3粉 80部
VAGH（U.C.C社製の塩化ビニル
−酢酸ビニル−ビニルアルコール共重合体）
４部
パラプレン22S（日本ポリウレタン
社製のポリウレタンエラストマー） 16部
GAFAC−RS410（前出） １部
脂肪酸変性シリコーン化合物（y1，y2 １部
＝CH3、n1＝40、n2＝20、Ｒ＝C14H29）
シクロヘキサノン 50部
メチルエチルケトン 50部
上記の成分をボールミルで約70時間混合分散し
て磁性塗料をつくり、これを11μ厚のポリエステ
ルフイルム上に、乾燥厚みが6μとなるように塗
布乾燥したのち、常法により鏡面加工を施こし、
さらに所定巾に裁断して磁気テープを作製した。
実施例 ２
脂肪酸変性シリコーン化合物として、一般式中
のy1，y2＝C14H29COO、n1＝100、n2＝５、Ｒ＝
C14H29からなるものを使用した以外は、実施例
１と同様にして磁気テープを作製した。
比較例 １
脂肪酸変性シリコーン化合物の代りに、信越化
The present invention relates to a magnetic recording medium having excellent dispersibility of magnetic powder and improved durability and heat resistance. The magnetic layer of a magnetic recording medium is generally formed by applying a magnetic paint containing dissolved and dispersed magnetic powder and its binder onto a substrate such as a polyester film. The magnetic properties or electromagnetic conversion properties of the magnetic layer formed in this way depend mainly on the state of dispersion of the magnetic powder. Conventionally, attempts have been made to add various dispersants to magnetic paints in order to improve such dispersibility. It is known that polyalkylene oxide alkyl phosphate esters or salts thereof act effectively as the above-mentioned dispersants, improve the filling properties and orientation of magnetic powder, and impart excellent magnetic properties or electromagnetic conversion properties. There is. However, when the above-mentioned dispersant is used, there are drawbacks such as a decrease in the bonding force between the magnetic powder and the binder resin, or a tendency for the dispersant to ooze out onto the surface of the magnetic layer. As a result, powder fall-off is noticeable, output fluctuations are large, tape squeal occurs, and durability characteristics are poor. In addition, it also has poor heat resistance properties that may cause interlayer adhesion. On the other hand, in order to address the above-mentioned problems, attempts have been made to incorporate general lubricants such as silicone oil and fluorine oil into the magnetic layer, which has the effect of improving durability and heat resistance. Although,
In this case, since the compatibility between the lubricant and the dispersant and binder is poor, the dispersibility is adversely affected and the magnetic properties or electromagnetic conversion properties are deteriorated. From the above point of view, the magnetic recording medium of the present invention has the following features:
A specific fatty acid-modified silicone compound is added as a lubricant to a magnetic paint using polyalkylene oxide alkyl phosphate ester or its salt as a dispersant, and this is applied onto a substrate such as a polyester film. It has been found that by using the above lubricant, the durability and heat resistance of the magnetic layer can be improved without impairing the dispersibility of the magnetic powder. The fatty acid-modified silicone compound used in this invention has the following general formula: (In the formula, y 1 and y 2 are -CH 3 or -OCOR, R is a saturated or unsaturated hydrocarbon group having 7 to 21 carbon atoms, n 1 is an integer from 40 to 100, and n 2 is an integer from 5 to 20. integer, n 1
+n 2 is 45 to 120). This type of compound is
Since it is moderately compatible with various binders and the above-mentioned dispersants, there is no risk of impairing the dispersibility of the magnetic powder, and while it provides good results in magnetic properties or electromagnetic conversion properties, it does not have the drawbacks of the above-mentioned dispersants. It improves durability and heat resistance, reduces powder shedding and output fluctuations during tape running, and effectively prevents tape squeal and interlayer adhesion. The polyalkylene oxide alkyl phosphate ester or salt thereof used in combination with the above lubricant has the following general formula; In the formula, R 1 , R 2 , R 3
is a hydrocarbon group having 1 to 32 carbon atoms, R 4 , R 5 , R 6 are hydrogen atoms, methyl groups or ethyl groups, M 1 and M 2 are hydrogen atoms, monovalent metals or -N(R 7 ) q (R 8 ) 4-q . Furthermore, R 7 and R 8 above represent a hydrogen atom, a methyl group or an ethyl group, and m, n and p are 1 to 1.
An integer of 60, q is an integer of 1 to 4. Commercial products of such polyalkylene oxide alkyl phosphate esters or salts thereof include GAFAC-RE410 and RE610 manufactured by Toho Chemical Industry Co., Ltd.
RS410 (R 1 , R 2 , R 3 in the general formula are -CH 2 (CH 2 )
11 CH 3 , R 4 , R 5 , R 6 , M 1 , M 2 are hydrogen atoms, m,
n, p is 3), RS710, LO-529, etc. The amount of the lubricant and dispersant mentioned above is preferably 0.1 to 5 parts by weight each per 100 parts by weight of magnetic powder, and if these amounts are too large,
There is a risk of problems such as a decrease in dispersion and bleed-out, resulting in a decrease in output. The magnetic powder applied to this invention includes γ-Fe 2
O 3 , Fe 3 O 4 , intermediate iron oxide powder, Co
In addition to magnetic oxide powder such as iron oxide powder containing iron oxide powder, any metal magnetic powder such as Fe, Ni, or an alloy thereof can be used. Further, as the binder, any of various conventionally known resins can be used. Next, examples of this invention will be described. In the following, parts shall mean parts by weight. Example 1 Co-containing γ-Fe 2 O 3 powder 80 parts VAGH (vinyl chloride-vinyl acetate-vinyl alcohol copolymer manufactured by UCC)
4 parts Paraprene 22S (polyurethane elastomer manufactured by Nippon Polyurethane Co., Ltd.) 16 parts GAFAC-RS410 (mentioned above) 1 part Fatty acid-modified silicone compound (y 1 , y 2 1 part = CH 3 , n 1 = 40, n 2 = 20, R=C 14 H 29 ) Cyclohexanone 50 parts Methyl ethyl ketone 50 parts The above ingredients were mixed and dispersed in a ball mill for about 70 hours to make a magnetic paint, and this was applied onto a polyester film with a thickness of 11μ so that the dry thickness was 6μ. After drying, mirror finish is applied using conventional methods.
The tape was then cut into a predetermined width to produce a magnetic tape. Example 2 As a fatty acid-modified silicone compound, y 1 , y 2 = C 14 H 29 COO, n 1 = 100, n 2 = 5, R = in the general formula
A magnetic tape was produced in the same manner as in Example 1, except that a magnetic tape made of C 14 H 29 was used. Comparative Example 1 Shin-Etsu Chemical instead of fatty acid-modified silicone compound
【表】
上表から明らかなように、この発明の磁気テー
プは、磁性粉末の分散性が良好なため、電磁変換
特性にすぐれ、しかも耐久性および耐熱性にもす
ぐれたものであることが判る。[Table] As is clear from the above table, the magnetic tape of the present invention has excellent electromagnetic conversion characteristics due to the good dispersibility of the magnetic powder, and is also found to have excellent durability and heat resistance. .
Claims (1)
イドアルキル燐酸エステルまたはその塩を用いた
磁性層中に、潤滑剤としてつぎの一般式； （式中、y1，y2は−CH3または−OCOR、Ｒは
炭素数７〜21の飽和もしくは不飽和の炭化水素
基、n1は40〜100の整数、n2は５〜20の整数、n1
＋n2は45〜120である） で表わされる脂肪酸変性シリコーン化合物を含ま
せたことを特徴とする磁気記録媒体。[Claims] 1. In a magnetic layer using a polyalkylene oxide alkyl phosphate ester or its salt as a dispersant for magnetic powder, the following general formula is used as a lubricant; (In the formula, y 1 and y 2 are -CH 3 or -OCOR, R is a saturated or unsaturated hydrocarbon group having 7 to 21 carbon atoms, n 1 is an integer from 40 to 100, and n 2 is an integer from 5 to 20. integer, n 1
+ n2 is 45 to 120) A magnetic recording medium characterized in that it contains a fatty acid-modified silicone compound represented by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56039848A JPS57152535A (en) | 1981-03-18 | 1981-03-18 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56039848A JPS57152535A (en) | 1981-03-18 | 1981-03-18 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57152535A JPS57152535A (en) | 1982-09-20 |
| JPH0427609B2 true JPH0427609B2 (en) | 1992-05-12 |
Family
ID=12564375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56039848A Granted JPS57152535A (en) | 1981-03-18 | 1981-03-18 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57152535A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61915A (en) | 1984-06-13 | 1986-01-06 | Konishiroku Photo Ind Co Ltd | Magnetic recording medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5494308A (en) * | 1978-01-09 | 1979-07-26 | Tdk Corp | Production of magnetic recording medium |
| JPS56169223A (en) * | 1980-05-28 | 1981-12-25 | Sony Corp | Magnetic recording medium |
-
1981
- 1981-03-18 JP JP56039848A patent/JPS57152535A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5494308A (en) * | 1978-01-09 | 1979-07-26 | Tdk Corp | Production of magnetic recording medium |
| JPS56169223A (en) * | 1980-05-28 | 1981-12-25 | Sony Corp | Magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57152535A (en) | 1982-09-20 |
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