JPS63306516A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS63306516A JPS63306516A JP14156487A JP14156487A JPS63306516A JP S63306516 A JPS63306516 A JP S63306516A JP 14156487 A JP14156487 A JP 14156487A JP 14156487 A JP14156487 A JP 14156487A JP S63306516 A JPS63306516 A JP S63306516A
- Authority
- JP
- Japan
- Prior art keywords
- general formula
- magnetic layer
- recording medium
- compound
- 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.)
- Pending
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 60
- 125000001183 hydrocarbyl group Chemical group 0.000 claims abstract description 12
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims abstract description 5
- 150000001875 compounds Chemical class 0.000 claims description 35
- 125000004432 carbon atom Chemical group C* 0.000 claims description 13
- 229930195734 saturated hydrocarbon Natural products 0.000 claims description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 229930195735 unsaturated hydrocarbon Natural products 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 20
- 239000011230 binding agent Substances 0.000 description 13
- 229920001296 polysiloxane Polymers 0.000 description 7
- 239000006247 magnetic powder Substances 0.000 description 6
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 125000005313 fatty acid group Chemical group 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 description 1
- 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
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 235000014113 dietary fatty acids 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
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
- 239000000787 lecithin Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
本発明は、例えば磁気テープ又は磁気ディスク等の磁気
記録媒体に関するものである。The present invention relates to a magnetic recording medium such as a magnetic tape or a magnetic disk.
近年における記録密度向上の要求は著しく、このような
観点から、磁性粉は超微粒子化されるとともに、その超
微粒子化された磁性粉としては合金微粉末系の磁性粉が
使用されるようになっており、さらに磁性層の表面は平
滑化され、これに伴なって磁性層の動摩擦係数が高くな
る傾向がある。
このような磁気記録媒体の磁性層の動摩擦係数を小さく
して、走行安定性及び耐串粍性を良くする為に、従来で
は、例えばジメチルシリコーン等のシリコーンオイルあ
るいは下記一般式ｍ〜［９］で表される変性オルガノシ
リコーン化合物を磁性層中に加えることが提案されてい
る。
しかし、ジメチルシリコーン等のシリコーンオイルは、
滑性に優れているものの、磁性層１表面に滲み出し易く
、粘着が起き、電磁変換特性の低下を招き、好ましくな
い。
又°、一般式（１１〜［９］で糸される変性オルガノシ
リコーン化合物はジメチルシリコーンに比べれば改善は
されているものの、以下に示す欠点があり、特に合金微
粉末系の磁性粉を使用した時には、動摩擦係数低下に対
する効果は小さい。
これらの変性オルガノシリコーンのうち、特開るが、バ
インダとの相溶性が悪く、ブルーミングが起き易く、長
時間走行時における磁性層の耐久性が劣る。
又、特開昭５７−１２４１４号公報提案の［２］のもの
は、高温多湿の条件でも分解することな・く、安定性が
良いが、分子末端に脂肪酸基を有するのみなので、ブル
ーミングが起き易く、長時間走行時における耐久性が劣
る。
又、特開昭５２−１０８８０号公報提案の［３］のもの
は、バインダとの相溶性に優れているものの、熱安定性
に劣り、磁性塗料のゲル化あるいは分散性を悪くし、か
つ、高温多湿といった条件下で記録再生を行うと磁気テ
ープの走行安定性が悪い。
又、特開昭５７−１２４２０号公報提案の［４］のもの
は低温条件下での滑性に劣り、耐久性が悪い。
又、特開昭５６−１６９２２３号公報提案の［ｊ］、［
６］のものは、脂肪酸基が直接Ｓｉ原子に結合していな
いために、熱安定性に優れており、又−（Ｃ１１□）２
ＣＦ３基を有しているから滑性効果はあるが、バインダ
との相溶性に欠け、長時間走行性に劣る。
又、［７］のものは、親水性基を有することに特徴があ
るが、カルボキシル基はバインダとの相溶性が良いわけ
ではなく、基本的にはジメチルシリコーンと変わりなく
、バインダとの相溶性が悪く、ブルーミングが激しく、
ヘッドクロッグが起きる。
又、スルホン酸すトリウム基においても同じである。
又、特開昭５９−２２２２７号公報提案の［８］のもの
は、（ＣＨ，）、ＣＦ３基を導入しているため、滑性効
果に優れており、バインダとの相溶性も良いが、直鎖状
のシリコーンのため、本発明のものより耐久性に劣り、
特に合金微粉末系の磁性粉においては動摩擦係数の低下
に対する効果は少ない。
又、特開昭５９−２２２２９号公報提案の［９〕のもの
は、分子中に側鎖を有している為に、長時間使用におい
ても滑剤の欠落がなく、バインダとの相溶性に優れ、又
、高温多湿といった条件下でも分解することなく、安定
性に優れ、低温条件下においても効果を発揮するもので
あるが、まだ十分満足できるものではなかった。In recent years, there has been a significant demand for improved recording density, and from this perspective, magnetic powder has been made into ultra-fine particles, and as the ultra-fine magnetic powder, alloy fine powder-based magnetic powder has come to be used. Furthermore, the surface of the magnetic layer is smoothed, and the dynamic friction coefficient of the magnetic layer tends to increase accordingly. In order to reduce the dynamic friction coefficient of the magnetic layer of such a magnetic recording medium and improve running stability and skewness resistance, conventionally, silicone oil such as dimethyl silicone or the following general formula m ~ [9] It has been proposed that a modified organosilicone compound represented by: be added to the magnetic layer. However, silicone oil such as dimethyl silicone
Although it has excellent lubricity, it tends to ooze out onto the surface of the magnetic layer 1, causing adhesion and deterioration of electromagnetic conversion characteristics, which is not preferable. In addition, although the modified organosilicone compound threaded by the general formulas (11 to [9] is improved compared to dimethyl silicone, it has the following drawbacks, especially when using a magnetic powder based on alloy fine powder. In some cases, the effect on lowering the coefficient of dynamic friction is small. Among these modified organosilicones, those disclosed in Japanese Patent Application Publication No. 2003-120001 have poor compatibility with binders, are prone to blooming, and have poor durability of the magnetic layer during long-term running. , [2] proposed in JP-A No. 57-12414 does not decompose even under high temperature and high humidity conditions and has good stability, but since it only has a fatty acid group at the end of the molecule, it is susceptible to blooming. , the durability during long-term running is poor.Furthermore, the product [3] proposed in JP-A No. 52-10880 has excellent compatibility with the binder, but has poor thermal stability and is not suitable for magnetic paints. If gelation or dispersibility is deteriorated and recording and reproduction are performed under conditions of high temperature and humidity, running stability of the magnetic tape will be poor.Furthermore, the magnetic tape proposed in [4] in JP-A No. 57-12420 is used at low temperatures. It has poor lubricity and poor durability under various conditions. Also, [j] and [j] proposed in JP-A No. 56-169223.
6] has excellent thermal stability because the fatty acid group is not directly bonded to the Si atom, and -(C11□)2
Since it has a CF3 group, it has a lubricating effect, but it lacks compatibility with the binder and has poor long-term running properties. In addition, the product [7] is characterized by having a hydrophilic group, but the carboxyl group does not have good compatibility with the binder, and is basically the same as dimethyl silicone, and has a low compatibility with the binder. is bad, and the blooming is intense.
Headclog wakes up. The same applies to the sulfonic acid thorium group. In addition, the product [8] proposed in JP-A-59-22227 introduces (CH,) and CF3 groups, so it has excellent lubricity and good compatibility with binders. Because it is a linear silicone, it is less durable than the one of the present invention.
In particular, magnetic powder based on fine alloy powder has little effect on lowering the coefficient of dynamic friction. In addition, the product [9] proposed in JP-A No. 59-22229 has a side chain in the molecule, so there is no loss of lubricant even when used for a long time, and it has excellent compatibility with the binder. In addition, it does not decompose even under high temperature and high humidity conditions, has excellent stability, and is effective even under low temperature conditions, but it is still not fully satisfactory.
本発明者は、磁気記録媒体における磁性層含有成分ｉこ
ついての研究を鋭意押し進めた結果、下記の一般式［＾
］で表される化合物を磁性層中に含ませていると、この
磁気記録媒体は長時間使用において（走行安定性に優れ
ていることを見出した。
（但し、Ｒは炭素数７〜２１の１価の飽和又は不飽和の
炭化水素基、Ｒ，、Ｒ，はメチル基又はＲＣＯＯ基、Ｒ
３は炭素数１〜２（ｌの１価の飽和炭化水素基、Ｒ１は
炭素数８〜２２の１価の飽和又は不飽和の炭化水素基、
ａ、ｂ、ｅは、１≦ｉ＜、２００．１≦ｂ（２００，１
≦ｅ＜Ｚｏｏ、ａ＋ ｂ＋ ｃ≦５００の条件を満たす
整数、ｍ、ｎは１≦霧≦１０．１≦ｎ≦５の条件を満た
す整数）すなわち、磁性層中に含ませる上記一般式［＾
］で表される化合物は、その分子中にバインダ成分との
親和性に優れる脂肪酸基を有しているので、゛バインダ
との相溶性は良く、又、分子中に側鎖を有している為に
、長時間使用においても滑剤の欠落がなく、繰り返し使
用時における耐久性に優れ、高温多湿といった条件下で
も分解することなく、安定性が良い。
上記の一般式［＾コにおいて、Ｒは炭素数７〜２１の炭
化水素基であり、炭素数が６以下のものは、滑性が充分
でなく、磁性層の耐久性に劣り、２２以上のものでは、
バインダとの相溶性が悪くなり、低温での滑性に劣る。
Ｉｔ、、Ｒ２は、メチル基でも良いし、ＲＣＯＯ基でも
良い。
Ｒ３は、炭素数１〜２０の炭化水素基であり、炭素数が
２１以上のものは、バインダとの相溶性に劣り、好まし
くは炭素数、１〜４のアルキル基であり、さらに好まし
くはメチル基である。
Ｒ，は、炭素数８〜２２の炭化水素基であり、Ｒ４の炭
素数が７以下のものは滑性が充分でなく、磁性層の耐久
性に劣り、逆に２３以上のものでは、バインダとの相溶
性が悪くなり、又、低温での滑性に劣る。
又、一般式［＾コにおける嶋す、ａ、論、ｎは、１≦ａ
＜２００．１≦ｂ＜２００．１≦ｅ＜２００．ａ十り＋
ｅ≦５００．１≦請≦１０．１≦ｎ≦５の条件を満たす
整数である。
すなわち、ａ、ｂ、ｃ、ｍ、ｎが大きくなりすぎると、
つまり一般式［＾］で表される化合物の分子量が大きく
なりすぎると、バインダ成分との相溶性が悪くなり、こ
の化合物の分散性が悪く、滑性効果を効果的に発揮させ
られにくくなるからである。
尚、上記一般式［＾］で表される化合物は、磁性層中の
磁性粉の量に対して約０．５〜６．０重量％含有されて
いることが望ましい、すなわち、この化合物の量が少な
すぎる場合には、それだけ効果が弱いからであり、逆に
多くなりすぎると、滑性効果は大きいものの、磁性塗膜
に対する可塑効果が大きくなり、スチル再生時等の耐久
性が低下する。As a result of intensive research into the components i contained in the magnetic layer in magnetic recording media, the inventor has developed the following general formula [^
It has been found that when the magnetic layer contains a compound represented by Monovalent saturated or unsaturated hydrocarbon group, R, is a methyl group or RCOO group, R
3 is a monovalent saturated hydrocarbon group having 1 to 2 carbon atoms (l, R1 is a monovalent saturated or unsaturated hydrocarbon group having 8 to 22 carbon atoms,
a, b, e are 1≦i<, 200.1≦b(200,1
In other words, the above general formula [＾
] The compound represented by has a fatty acid group in its molecule that has excellent affinity with the binder component, so it has good compatibility with the binder, and also has a side chain in the molecule. Therefore, there is no loss of lubricant even when used for a long time, and it has excellent durability during repeated use, and it does not decompose even under conditions of high temperature and humidity, and has good stability. In the general formula above, R is a hydrocarbon group having 7 to 21 carbon atoms; those with 6 or less carbon atoms do not have sufficient lubricity and the durability of the magnetic layer is poor; In terms of things,
It has poor compatibility with the binder and has poor lubricity at low temperatures. It, , R2 may be a methyl group or a RCOO group. R3 is a hydrocarbon group having 1 to 20 carbon atoms, and those having 21 or more carbon atoms have poor compatibility with the binder, so R3 is preferably an alkyl group having 1 to 4 carbon atoms, and more preferably methyl. It is the basis. R, is a hydrocarbon group having 8 to 22 carbon atoms; when R4 has 7 or less carbon atoms, the slipperiness is insufficient and the durability of the magnetic layer is poor; on the other hand, when R4 has 23 or more carbon atoms, the binder In addition, the compatibility at low temperatures is poor. Also, in the general formula [^ko, shimasu, a, ron, n is 1≦a
<200.1≦b<200.1≦e<200. a ten +
It is an integer that satisfies the condition e≦500.1≦application≦10.1≦n≦5. That is, if a, b, c, m, and n become too large,
In other words, if the molecular weight of the compound represented by the general formula [^] becomes too large, the compatibility with the binder component will be poor, the dispersibility of this compound will be poor, and it will be difficult to effectively exert the lubricating effect. It is. The compound represented by the above general formula [^] is preferably contained in an amount of about 0.5 to 6.0% by weight based on the amount of magnetic powder in the magnetic layer, that is, the amount of this compound is If the amount is too small, the effect will be weak, whereas if it is too large, the lubricity effect will be great, but the plasticizing effect on the magnetic coating will be large, and the durability during still reproduction etc. will be reduced.
【実施例１】
鉄元素を主成分とする金属系の強磁性粉１００１ｉ量部
、塩化ビニル−酢酸ビニル−ビニルアルコ−。
ル共重合体１０重量部、ポリウレタンエラストマー２０
重量部、酸化アルミニウム１０重量部、トルエンとメチ
ルエチルケトンとメチルイソブチルケトンの等１混合物
３００１１量部、レシチン１重量部、ステアリン酸ブチ
ル１重１部、前記一般式［Ａ］におけるＲ；Ｃｓｌ＋ｙ
、Ｒ＋４ｘ４ｓ□ＣＨｓ、 Ｒａ：Ｃｓｌ＋ｔ、ａ＝ｂ
＝ｃ：ｍ：ｎ・２の化合物２重量部を混合分散させた後
、イソシアネート系の硬化剤を２０重量部加えてさらに
分散させ、その後この磁性塗料をポリエステルフィルム
等の非磁性支持体上に塗布し、配向処理、カレンダー処
理及び硬化処理等の通常の工程を経て、本発明になる磁
気記録媒体を得る。Example 1 1001 parts of metallic ferromagnetic powder containing iron as a main component, vinyl chloride-vinyl acetate-vinyl alcohol. 10 parts by weight of polyurethane copolymer, 20 parts by weight of polyurethane elastomer
parts by weight, 10 parts by weight of aluminum oxide, 30011 parts by weight of 1 mixture of toluene, methyl ethyl ketone, methyl isobutyl ketone, etc., 1 part by weight of lecithin, 1 part by weight of butyl stearate, R in the above general formula [A]; Csl+y
, R+4x4s□CHs, Ra:Csl+t, a=b
After mixing and dispersing 2 parts by weight of the compound of =c:m:n・2, 20 parts by weight of an isocyanate-based curing agent is added and further dispersed, and then this magnetic paint is applied onto a non-magnetic support such as a polyester film. The magnetic recording medium of the present invention is obtained by coating, and then undergoing ordinary steps such as orientation treatment, calendar treatment, and hardening treatment.
【実施ＦＭ２５
実施例１における一般式〔＾］として、Ｒ＝ＣｔＨ＋ｓ
、Ｒ＋：Ｒｔ”Ｃｗｌｌ＋１ＣＱＱ、代ｓ”ｃｔＪｔ＋
、Ｊ：Ｃｓ１ｌ＋ｙ、ｎ＝ｂ：ｃ＝ｍ＝ｎ４の化合物を
用い、その他は全く同様にして磁気記録媒体を得る。
【実施例３】
実施例１における一般式［＾］として、Ｒ＝Ｃ＋５Ｈｔ
ｔ、Ｒ＋：Ｒａ：Ｒｓ”ＣＨｓ％Ｒａ”Ｃ５Ｈｒｖ、ｎ
＝５、ｂ：ｃ：２、ｍ ＝ ｎ ＝、１の化合物を用い
、その他は全く同様にして磁気記録媒体を得る。
！実施例４】
実施例１における一般式［＾］として、Ｒ＝Ｃ＋Ｊｉｔ
・Ｒ＋４ｔ＝Ｃ＋＊１ＩｔｔＣ００、Ｒａ：Ｃｆ１３、
Ｒ４＝Ｃ５ｌｌ＋ｖ、ｎ＝５、ｂ＝ｃ＝１０、論・ｎ：
２の化合物を用い、その他は全く同様にして磁気記録媒
体を得る。[Implementation FM25 As the general formula [^] in Example 1, R=CtH+s
, R+: Rt"Cwll+1CQQ, s"ctJt+
, J:Cs1l+y, n=b:c=m=n4, and in the same manner except that a magnetic recording medium is obtained. [Example 3] As the general formula [^] in Example 1, R=C+5Ht
t, R+:Ra:Rs"CHs%Ra"C5Hrv,n
=5, b:c:2, m = n =, 1. A magnetic recording medium is obtained in exactly the same manner except that the compound of m = n = 1 is used. ! Example 4 As the general formula [^] in Example 1, R=C+Jit
・R+4t=C+*1IttC00, Ra:Cf13,
R4=C5ll+v, n=5, b=c=10, theory/n:
A magnetic recording medium is obtained using the compound No. 2 and in the same manner as above.
【実施例５】
実施例１における一般式［＾］として、 Ｒ：ＣｌＪｚ
ｙ、Ｒ＋ ４ｚ４ｓ＝ＣＩ３、Ｒ４：ｃｓＨ＋ｙ、 ａ
＋＋５、 ｂ＝２、 Ｃ＝７、 輪＝ｎ”５の化金物を
用い、その他は全く同様にして磁気ご己録媒体を得る。[Example 5] As the general formula [^] in Example 1, R: ClJz
y, R+ 4z4s=CI3, R4:csH+y, a
A magnetic self-recording medium is obtained in exactly the same manner except that a metal compound with ++5, b=2, C=7, and ring=n''5 is used.
【実施例６】
実施例１における一般式［＾］として、訃Ｃ＋ｚＨｔｙ
、１１＝Ｒ１＝Ｒｓ：ｃｎａ、Ｒ４＝Ｃ５ｌｌ＋ｔ、ａ
：ｂ＝ａ＝５０．５＝ｎ＝５の化合物を用い、その他は
全く同様にして磁気記録媒体を得る。[Example 6] As the general formula [^] in Example 1, 訃C+zHty
, 11=R1=Rs:cna, R4=C5ll+t, a
A magnetic recording medium is obtained in exactly the same manner except that a compound of: b=a=50.5=n=5 is used.
【実施例７】
実施例１における一般式［＾］として、Ｒ＝Ｃ，マ１ｌ
ｓｓ、Ｒｔ＝ｈ”Ｃｆ１ｓ、 Ｒｓ：Ｃｌｄｌｓｓ、Ｒ
＜：Ｃｓ１ｌ＋ｙ、ｉ・１Ｇ、 ｂ□８、ｃ；２５、−
＝ｎｌ＋３の化合物を用い、その他は全く同様にして磁
気記録媒体を得る。[Example 7] As the general formula [^] in Example 1, R=C, Ma1l
ss, Rt=h”Cf1s, Rs: Cldlss, R
<: Cs1l+y, i・1G, b□8, c; 25, -
A magnetic recording medium is obtained in exactly the same manner except that the compound of =nl+3 is used.
【実施例８】
実施例１における一般式［＾］として、Ｒ”ＣｌｔＨｓ
ｓ、Ｒ＋”Ｒａ：ＣｌｔＨｓｓＣＯＯ１Ｒｓ”Ｃｌｌ５
． Ｒ，−Ｃ，ｆｌｉｙ、ａ：１Ｇ、、 ｂ：８、Ｃ・
２５、輪・ｎ・３の化合物を用い、その他は全く同様゛
にして磁気記録媒体を得る。[Example 8] As the general formula [^] in Example 1, R”CltHs
s, R+”Ra:CltHssCOO1Rs”Cll5
．． R, -C, fly, a: 1G,, b: 8, C.
25, a magnetic recording medium is obtained using the ring-n-3 compound and in the same manner as above.
【比較例１】
実施例１において、一般式［Ａ］の化合物の代りに、Ｒ
＝Ｒ’ ”ＣｌｓＬｙ、ｎ＝５の一般式［１］の化合物
を用いて同様に行ない、磁気記録媒体を得る。[Comparative Example 1] In Example 1, instead of the compound of general formula [A], R
=R'''ClsLy, a magnetic recording medium is obtained in the same manner using a compound of general formula [1] where n=5.
【比較例２】
実施例１において、一般式［Ａ］の化合物の代りにＲ＋
＝Ｒ＊’Ｃ＋３Ｈ＊−１ｆ＝５、−・２、ｎ□３の一般
式［２］の化合物を用いて同様に行ない、磁気記録媒体
を得る。[Comparative Example 2] In Example 1, R +
A magnetic recording medium is obtained by carrying out the same procedure using a compound of the general formula [2] where =R*'C+3H*-1f=5, -.2, n□3.
【比較例３１ 、 、
実施例１において、一般式［Ａ１の化合物の代りにＲ４
’ ；ＣｌＪｔｔ、−；３、ｎ；１５の一般式［３］の
化合物を用いて同様は行ない、磁気記録媒体を得る。
に比較例４】
実施例１において、一般式［Ａ］の化合物の代りにＲ”
ＣｌＪｘｔ、１３、ｎ＝１５の一般式［４］の化合物を
用いて同様に行ない、磁気記録媒体を得る。[Comparative Example 31, , In Example 1, R4 instead of the compound of general formula [A1]
The same procedure is performed using a compound of the general formula [3] of ';ClJtt, -;3, n;15 to obtain a magnetic recording medium. Comparative Example 4] In Example 1, R'' instead of the compound of general formula [A]
A magnetic recording medium is obtained in the same manner using a compound of general formula [4] with ClJxt, 13, n=15.
【比較例５】
実施例１において、一般式［Ａ］の化合物の代りにＲ”
ＣｌＪｚｔ、ｏ’ ＝３． ｆｆ１＝１０、−；８、ｎ
：ｌＯの一般式［５］の化合物を用いて同様に行ない、
磁気記録媒体を得る。[Comparative Example 5] In Example 1, R” instead of the compound of general formula [A]
ClJzt, o' = 3. ff1=10,-;8,n
The same procedure is carried out using a compound of general formula [5] of :IO,
Obtain a magnetic recording medium.
【比較例６】
実施例１において、一般式［Ａ］の化合物の代りにＲ”
ｌ＋Ｊ＊ｔ、ｎ’ □３． ｎ＝ｉｏ、 ＠□８、ｎ＝
２０の一般式［６］の化合物を用いて同様に行ない、磁
気記録媒体を得る。[Comparative Example 6] In Example 1, R” instead of the compound of general formula [A]
l+J*t, n' □3. n=io, @□8, n=
A magnetic recording medium is obtained by carrying out the same procedure using the compound of general formula [6] of 20.
【比較例７】
実施例１において、一般式［Ａ］の化合物の代りに１＝
２、ｓ；３０． ｎ・５の一般式［）］の化合物を用い
て同様に行ない、磁気記録媒体を得る。[Comparative Example 7] In Example 1, instead of the compound of general formula [A], 1=
2, s; 30. A magnetic recording medium is obtained in the same manner using a compound of the general formula [)] of n·5.
【比較例８】
実施例１において、一般式［Ａ］の化合物の代りにＲ＋
；Ｃ１２ＩＩ ！ ｔ、Ｒ，＝Ｃ１１３、Ｒｓ；Ｃ＋
５ｌｌｉｙＣＯＯ１Ｙ：ＣＦ、。
１：３０、−＝３８、ｎ；２０の一般式［８］の化合物
を用いて同様に行ない、磁気記録媒体を得る。[Comparative Example 8] In Example 1, R +
;C12II! t,R,=C113,Rs;C+
5lliyCOO1Y:CF,. A magnetic recording medium is obtained in the same manner using a compound of general formula [8] with 1:30, -=38, n:20.
【比較例９】
実施例１において、一般式［Ａ］の化合物の代りにＲ＝
Ｃ，３Ｉｔ□、Ｒ，＝Ｒ，＝Ｒ，＝ＣＨ，、Ｒｓ”Ｃ＋
２１１ｚｔＣＯＯ１ｋ＝５．１＝２、階＝７、ｎ・３
０の一般式［９］の化合物を用いて同様に行ない、磁気
記録媒体を得る。[Comparative Example 9] In Example 1, instead of the compound of general formula [A], R=
C,3It□,R,=R,=R,=CH,,Rs"C+
211ztCOO1k=5.1=2, floor=7, n・3
A magnetic recording medium is obtained in the same manner using a compound of general formula [9] of 0.
【比較例１０】
実施例１において、一般式［Ａ］の化合物の代りに比較
例８及び゛比較例９の化合物を１重量部ずつ用いて同様
に行ない、磁気記録媒体を得る。Comparative Example 10 The same procedure as in Example 1 was repeated using 1 part by weight of the compounds of Comparative Example 8 and Comparative Example 9 in place of the compound of general formula [A] to obtain a magnetic recording medium.
上記各側で得た磁気記録媒体について、初期時の動摩擦
係数、２００回の縁り返し走行後の動！！擦係数、磁性
層の耐摩耗性及びブルーミングを調べたので、その結果
、を表に示す。
尚、初期の動摩擦係数は、温度２０℃、湿度８０％ＲＨ
の条件下で測定したものであり、又、繰り返し走行後の
動摩擦係数は、温度４０℃、湿度８０％ＲＨの条件下で
測定したものであり、耐摩耗性は、常温において４０φ
の回転ドラムをＺＯＯｒｐ＋ｓで回転させ、その際の動
摩擦係数の上昇傾向より判定したものである。
表
これによれば、一般式［１］で表される両末端脂肪酸変
性ジメチルシリコーンを用いたものは、比較例１に示す
如く、高温多湿下、特に高温多湿下において繰り返し走
行させると、動摩擦係数は著しく高くなり、走行性が悪
く、又、磁性層の耐久性にも劣り、さらにはブルーミン
グも酷い。
又、一般式［２］で表される変性オルガノシリコーンを
用いたものも、比較例２に示す通り、比較例１のものと
同様な欠点がある。
又、−ａ式［３］で表される変性オルガノシリコーンを
用いたものは、比較例３に示す通り、ブルーミングは起
きにくいものの、磁性層の耐久性は良くなく、さらには
動１！擦係数が大きく、特に高温多湿下で繰り返し走行
させた場合には動摩擦係数が著しく大きく、なり、走行
性が悪くなる。
又、−Ｒ式［４〕で表される脂肪酸変性シリコーンを用
いたものは、比較例４に示す通り、比較例３のものと同
様な欠点があるばかりでなく、ブルーミングら酷い。
又、−ｆｉ式［５コで表される変性オルガノシリコーン
を用いたものは、比較例５に示す通り、ブルーミングは
起きやすく、又、磁性層の耐久性も良くなく、さらには
動摩擦係数が大きく走行性が良くないものである。
又、一般式［６］で表される変性オルガノシリコーンを
用いたものは、ブルーミングが酷く、磁性層の耐久性も
良くなく、さらには動摩擦係数が大きく、走行性が良く
ないものである。
又、一般式［７］で表される変性オルガノシリコーンを
用いたものは、ブルーミングが酷く、磁性層の耐久性も
悪く、さらに動摩擦係数も大きく、走行性が悪い。
又、一般式［８］で表される変性オルガノシリコーンを
用いたものは、動摩擦係数が比較的大きく、走行性の点
において改良が求められるものであり、又、磁性層の耐
久性についても改良が求められるものである。
又、比較例［９］で表される変性オルガノシリコーンを
用いたものは、磁性層の耐久性及びブルーミングの点に
ついてはかなり満足できるものの、動摩擦係数が比較的
大きく、走行性の点において満足性に欠ける。
これに対して、一般式［＾］で表される化合物を用いた
本実施例１〜８のものは、磁性層の耐摩耗性に優れ、又
、ブルーミングも起きに＜＜、さらには動摩擦係数も小
さく、特に高温多湿下で繰り返し走行を行なった後でも
動摩擦係数は小さく、走行性に優れているのみではなく
、走行の安定性にも富んでいる。
に効果】
本発明に係る磁気記録媒体は、一般式［＾］で表される
化合物を含む磁性層を支持体上に構成したものであるか
ら、このものは動摩擦係数が小さく、特に高温多湿下で
繰り返し走行させた場合でも動摩擦係数は小さく０、走
行性が良いのみでなく、走行の安定性に富み、さらには
磁性層の耐久性にも−富み、かつ、ブルーミングが起き
に＜＜、記録再生特性が優れた特長を有する。Regarding the magnetic recording media obtained on each side above, the coefficient of kinetic friction at the initial stage and the behavior after 200 reversing runs! ! The friction coefficient, abrasion resistance of the magnetic layer, and blooming were investigated, and the results are shown in the table. In addition, the initial dynamic friction coefficient is at a temperature of 20°C and a humidity of 80%RH.
The coefficient of dynamic friction after repeated running was measured under the conditions of a temperature of 40°C and a humidity of 80% RH.The abrasion resistance was measured under the conditions of 40φ at room temperature.
The rotating drum was rotated at ZOOrp+s, and the determination was made based on the tendency of the dynamic friction coefficient to increase at that time. According to this table, as shown in Comparative Example 1, a product using dimethyl silicone modified with a fatty acid at both ends represented by the general formula [1] has a dynamic friction coefficient of is extremely high, the running properties are poor, the durability of the magnetic layer is also poor, and furthermore, blooming is severe. Further, as shown in Comparative Example 2, the one using the modified organosilicone represented by the general formula [2] also has the same drawbacks as that of Comparative Example 1. In addition, as shown in Comparative Example 3, in the case of using the modified organosilicon represented by the -a formula [3], although blooming does not easily occur, the durability of the magnetic layer is not good, and furthermore, the durability of the magnetic layer is poor. The coefficient of friction is large, and especially when the vehicle is repeatedly run under high temperature and high humidity conditions, the coefficient of dynamic friction becomes extremely large, resulting in poor running performance. Moreover, as shown in Comparative Example 4, the one using the fatty acid-modified silicone represented by the -R formula [4] not only has the same drawbacks as that of Comparative Example 3, but also exhibits severe blooming. In addition, as shown in Comparative Example 5, those using modified organosilicone represented by the -fi formula [5] tend to bloom easily, have poor durability of the magnetic layer, and have a large coefficient of dynamic friction. The running properties are not good. Furthermore, those using the modified organosilicone represented by the general formula [6] suffer from severe blooming, have poor durability of the magnetic layer, and have a large coefficient of dynamic friction, resulting in poor running properties. Furthermore, those using modified organosilicone represented by the general formula [7] suffer from severe blooming, have poor durability of the magnetic layer, have a large coefficient of dynamic friction, and have poor running properties. Furthermore, those using modified organosilicone represented by the general formula [8] have a relatively large coefficient of dynamic friction, and improvements are required in terms of running properties, as well as improvements in the durability of the magnetic layer. is what is required. Furthermore, although the modified organosilicone shown in Comparative Example [9] is quite satisfactory in terms of durability and blooming of the magnetic layer, it has a relatively large coefficient of dynamic friction and is not satisfactory in terms of running performance. It lacks. On the other hand, in Examples 1 to 8 using the compound represented by the general formula [^], the magnetic layer had excellent wear resistance, blooming did not occur, and the dynamic friction coefficient It has a small coefficient of dynamic friction even after repeated running under high temperature and high humidity, and has not only excellent running performance but also excellent running stability. Since the magnetic recording medium according to the present invention comprises a magnetic layer containing a compound represented by the general formula [^] on a support, it has a small coefficient of dynamic friction and is particularly suitable for use under high temperature and high humidity conditions. Even when running repeatedly, the coefficient of dynamic friction is small and 0, not only does it have good running properties, but it also has excellent running stability. Furthermore, the magnetic layer has excellent durability and does not cause blooming. It has excellent playback characteristics.
Claims (1)
持体上に構成したことを特徴とする磁気記録媒体。 ▲数式、化学式、表等があります▼［Ａ］ （但し、Ｒは炭素数７〜２１の１価の飽和又は不飽和の
炭化水素基、Ｒ＿１、Ｒ＿２はメチル基又はＲＣＯＯ基
、Ｒ＿３は炭素数１〜２０の１価の飽和炭化水素基、Ｒ
＿４は炭素数８〜２２の１価の飽和又は不飽和の炭化水
素基、ａ、ｂ、ｃは、１≦ａ＜２００、１≦ｂ＜２００
、１≦ｃ＜２００、ａ＋ｂ＋ｃ≦５００の条件を満たす
整数、ｍ、ｎは１≦ｍ≦１０、１≦ｎ≦５の条件を満た
す整数）[Scope of Claims] A magnetic recording medium comprising a magnetic layer comprising a compound represented by the following general formula [A] on a support. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [A] (However, R is a monovalent saturated or unsaturated hydrocarbon group with 7 to 21 carbon atoms, R_1 and R_2 are methyl groups or RCOO groups, and R_3 is the number of carbon atoms. 1 to 20 monovalent saturated hydrocarbon group, R
_4 is a monovalent saturated or unsaturated hydrocarbon group having 8 to 22 carbon atoms, a, b, and c are 1≦a<200, 1≦b<200
, 1≦c<200, an integer that satisfies the conditions of a+b+c≦500, m, n are integers that satisfy the conditions of 1≦m≦10, 1≦n≦5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14156487A JPS63306516A (en) | 1987-06-08 | 1987-06-08 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14156487A JPS63306516A (en) | 1987-06-08 | 1987-06-08 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63306516A true JPS63306516A (en) | 1988-12-14 |
Family
ID=15294906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14156487A Pending JPS63306516A (en) | 1987-06-08 | 1987-06-08 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63306516A (en) |
-
1987
- 1987-06-08 JP JP14156487A patent/JPS63306516A/en active Pending
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