JPS63113932A - Inorganic solid particle suspension for magnetic recording medium - Google Patents
Inorganic solid particle suspension for magnetic recording mediumInfo
- Publication number
- JPS63113932A JPS63113932A JP61261701A JP26170186A JPS63113932A JP S63113932 A JPS63113932 A JP S63113932A JP 61261701 A JP61261701 A JP 61261701A JP 26170186 A JP26170186 A JP 26170186A JP S63113932 A JPS63113932 A JP S63113932A
- Authority
- JP
- Japan
- Prior art keywords
- inorganic solid
- magnetic recording
- solid particles
- particle suspension
- solid particle
- 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
- 239000002245 particle Substances 0.000 title claims abstract description 48
- 239000000725 suspension Substances 0.000 title claims abstract description 24
- 229910003480 inorganic solid Inorganic materials 0.000 title claims description 37
- 125000002947 alkylene group Chemical group 0.000 claims abstract description 11
- 125000003545 alkoxy group Chemical group 0.000 claims abstract description 3
- 150000001875 compounds Chemical class 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 4
- -1 acetoxyl group Chemical group 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- HEHRHMRHPUNLIR-UHFFFAOYSA-N aluminum;hydroxy-[hydroxy(oxo)silyl]oxy-oxosilane;lithium Chemical compound [Li].[Al].O[Si](=O)O[Si](O)=O.O[Si](=O)O[Si](O)=O HEHRHMRHPUNLIR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052614 beryl Inorganic materials 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 229910052878 cordierite Inorganic materials 0.000 claims description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052634 enstatite Inorganic materials 0.000 claims description 2
- 229910000174 eucryptite Inorganic materials 0.000 claims description 2
- 229910052839 forsterite Inorganic materials 0.000 claims description 2
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 2
- BBCCCLINBSELLX-UHFFFAOYSA-N magnesium;dihydroxy(oxo)silane Chemical compound [Mg+2].O[Si](O)=O BBCCCLINBSELLX-UHFFFAOYSA-N 0.000 claims description 2
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- 229910052863 mullite Inorganic materials 0.000 claims description 2
- 229910052670 petalite Inorganic materials 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 229910001753 sapphirine Inorganic materials 0.000 claims description 2
- 239000006104 solid solution Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 2
- 229910052845 zircon Inorganic materials 0.000 claims description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 2
- 229910000505 Al2TiO5 Inorganic materials 0.000 claims 1
- 229910001597 celsian Inorganic materials 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 claims 1
- 229910052719 titanium Inorganic materials 0.000 claims 1
- 229910052726 zirconium Inorganic materials 0.000 claims 1
- 239000007787 solid Substances 0.000 abstract description 6
- 239000006185 dispersion Substances 0.000 abstract description 5
- 125000000217 alkyl group Chemical group 0.000 abstract description 4
- 125000003277 amino group Chemical group 0.000 abstract description 3
- 125000003668 acetyloxy group Chemical group [H]C([H])([H])C(=O)O[*] 0.000 abstract 1
- 229910052594 sapphire Inorganic materials 0.000 abstract 1
- 239000002270 dispersing agent Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000003125 aqueous solvent Substances 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 239000007822 coupling agent Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical group C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 2
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical group C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical group CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- 229920002253 Tannate Polymers 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002170 ethers Chemical class 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
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
- Paints Or Removers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、無機質固体粒子を分散した非水系磁気記録
媒体用懸濁液に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a suspension for non-aqueous magnetic recording media in which inorganic solid particles are dispersed.
一般に、無機質固体粒子を分散させた非水系磁気記録媒
体用）懸濁液は、無機質固体粒子、非水系溶媒および分
散剤より成り、こうした懸濁液においては、無機質固体
粒子ができる限り１次粒子近くまで良く分散され、また
、その良好な分散状態が長時間保持されることが必要と
される。しかしながら大多数の無機質固体粒子の表面は
親水性を示すため、親油性の非水系溶媒中に、無機質固
体粒子を均一に、かつ安定に分散させるのは極めて難し
い。In general, suspensions (for nonaqueous magnetic recording media) in which inorganic solid particles are dispersed are composed of inorganic solid particles, a nonaqueous solvent, and a dispersant. It is required that the particles be well dispersed close to each other and that the well-dispersed state be maintained for a long period of time. However, since the surfaces of most inorganic solid particles exhibit hydrophilicity, it is extremely difficult to uniformly and stably disperse inorganic solid particles in a lipophilic non-aqueous solvent.
このため、適当な分散剤を用いて無機質固体粒子表面を
処理することが行われており、たとえば、脂肪酸、チタ
ネートカップリング剤、アルミニウムカップリング剤な
どの分散剤を用いて無機質固体粒子表面を処理すること
が試みられている。For this reason, the surface of inorganic solid particles is treated using an appropriate dispersant. For example, the surface of inorganic solid particles is treated using a dispersant such as a fatty acid, a titanate coupling agent, or an aluminum coupling agent. An attempt is being made to do so.
（特開昭６０−１７００２６号、特開昭６０−１２９９
２７号）
〔発明が解決しようとする問題点〕
ところが、これら従来の分散剤を用いて無機質固体粒子
表面を処理すると、無機質固体粒子の分散性および分散
安定性はたしかに改善されるものの、いまだ充分に満足
できる結果は得られていない。(Unexamined Japanese Patent Application No. 60-170026, Unexamined Japanese Patent Application No. 60-1299
(No. 27) [Problems to be Solved by the Invention] However, although the dispersibility and dispersion stability of inorganic solid particles are certainly improved when the surfaces of inorganic solid particles are treated using these conventional dispersants, they are still insufficient. No satisfactory results have been obtained.
この発明は、かかる現状から、非水系磁気記録媒体用懸
濁液中における無機質固体粒子の分散性および分散安定
性を改善するため種々検討を行った結果なされたもので
、基本単位が、
Ｒｏ
ＲＳｔ ＮＨ２
し・
〔但し、式中ＲはＲ，（Ｒ２０）ｍ （ＣＨ２”）ｎで
あって、Ｒ５は炭素数１〜６のアルコキシ基またはアセ
トキシル基、Ｒ２はアルキレン基、ｍは１以上の整数、
ｎは０〜５の整数であり、ＲｏおよびＲＩＴは炭素数１
〜６のアルキル基またはアミノ基である。］
で示されるアルキレンオキサイドを含むオルガノシラザ
ン化合物で無機質固体粒子を処理することによって、非
水系磁気記録媒体用懸濁液中の無機質固体粒子の分散性
および分散安定性を充分に向上させたものである。This invention was made as a result of various studies to improve the dispersibility and dispersion stability of inorganic solid particles in suspensions for non-aqueous magnetic recording media, and the basic unit is Ro RSt. NH2 [However, in the formula, R is R, (R20)m (CH2'')n, R5 is an alkoxy group or acetoxyl group having 1 to 6 carbon atoms, R2 is an alkylene group, and m is an integer of 1 or more ,
n is an integer from 0 to 5, and Ro and RIT have 1 carbon number.
-6 alkyl group or amino group. ] By treating inorganic solid particles with an organosilazane compound containing an alkylene oxide represented by be.
前記一般式で示されるオルガノシラザン化合物のＲ２０
で表される繰り返し単位は、エチレンオキシド基とプロ
ピレンオキシド基とブチレンオキシド基とのうち少なく
とも二種の混合物から構成されていてもよく、混合物で
構成される場合、各゛単位がランダムであってもまたブ
ロックであってもよい。更にブロックである場合はその
付加順序は特に問われない。またＲｏおよびＲＩＴは一
方がアルキル基で、他方がアミン基であってもかまわな
い。R20 of the organosilazane compound represented by the above general formula
The repeating unit represented by may be composed of a mixture of at least two of an ethylene oxide group, a propylene oxide group, and a butylene oxide group, and when composed of a mixture, each unit may be random. It may also be a block. Furthermore, if it is a block, the order in which it is added is not particularly important. Further, one of Ro and RIT may be an alkyl group and the other may be an amine group.
このようにアルキレンオキサイドを含むオルガノシラザ
ン化合物は、無機質固体粒子表面のＯＨ基との反応性が
従来の分散剤に比べて極めて高（、無機質固体粒子と接
すると、オルガノシラザン化合物の基本単位がいくつか
重合したことにより生成したーＮＨ−結合部分、または
−ＮＨ２結合が切れてＮＨ３が放出され、無機質固体粒
子表面と酸素原子を介して化学的な結合を形成し、その
表面に固定される。またアルキレンオキサイド構造部分
のアルキレンオキサイドの種類や付加モル数を調整する
ことにより無機質固体粒子の非水系溶剤に対する親和性
を任意にコントロールすることができ、このため、種々
の非水系溶剤を用いる場合でも、また無機質固体粒子と
して粒子径の非常に小さなものを用いる場合でも、無機
質固体粒子の分散性とさらにその分散安定性が著しく改
善されたものとなる。In this way, organosilazane compounds containing alkylene oxide have extremely high reactivity with OH groups on the surface of inorganic solid particles compared to conventional dispersants. The -NH- bonding moiety or -NH2 bond produced by polymerization is broken and NH3 is released, forming a chemical bond with the surface of the inorganic solid particle through the oxygen atom and being fixed on the surface. In addition, by adjusting the type of alkylene oxide and the number of moles added in the alkylene oxide structure, the affinity of the inorganic solid particles to non-aqueous solvents can be arbitrarily controlled. Therefore, even when using various non-aqueous solvents, Furthermore, even when inorganic solid particles having a very small particle diameter are used, the dispersibility and dispersion stability of the inorganic solid particles are significantly improved.
このようなアルキレンオキサイドを含むオルガノシラザ
ン化合物の使用量としては、無機質固体粒子１００．ｉ
ｉ量部に対して０．１〜２０重量部の範囲内にするのが
好ましく、１〜１０重量部の範囲内とするのがより好ま
しい。この使用量が少なすぎては十分な分散性改善効果
が得られず、また多すぎるとかえって分散性が劣化する
。The amount of the organosilazane compound containing alkylene oxide used is 100% of the inorganic solid particles. i
It is preferably in the range of 0.1 to 20 parts by weight, and more preferably in the range of 1 to 10 parts by weight. If the amount used is too small, a sufficient effect of improving dispersibility cannot be obtained, and if it is too large, the dispersibility will deteriorate.
この発明においてアルキレンオキサイドを含むオルガノ
シラザン化合物で無機質固体粒子を処理して非水系磁気
記録媒体用懸濁液を作製するには、この種のオルガノシ
ラザン化合物を適宜の非水系溶媒に溶解した溶液をつく
り、この溶液中に無機質固体粒子をホモミキサー、サン
ドミル、ボールミルなどで混合分散させればよい。In the present invention, in order to prepare a suspension for non-aqueous magnetic recording media by treating inorganic solid particles with an organosilazane compound containing alkylene oxide, a solution of this type of organosilazane compound dissolved in a suitable non-aqueous solvent is prepared. Inorganic solid particles may be mixed and dispersed in this solution using a homomixer, sand mill, ball mill, etc.
非水系溶媒としては、炭素数１〜８のアルコール類、ア
セトン、メチルエチルケトン、メチルイソブチルケトン
などのケトン類、酢酸エチル、酢酸ブチルなどのエステ
ル類、ベンゼン、トルエンなどの芳香族類、テトラヒド
ロフラン、ジオキ号ンなどのエーテル類が単独または２
種以上混合して用いられる。Examples of non-aqueous solvents include alcohols with 1 to 8 carbon atoms, ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone, esters such as ethyl acetate and butyl acetate, aromatics such as benzene and toluene, tetrahydrofuran, and dioxin. Ethers such as
It is used in combination of more than one species.
また、無機質固体粒子としては、Ａ１□０３、ＴｉＯ２
、Ｓ ｉ０２ 、ＺｎＯ１α−Ｆｅ２０３、ＺｒＯ２な
どの単成分の金属酸化物、あるいはＡＩ、Ｔｉｓ Ｚｎ
、Ｆｅ、、Ｚｒなどの金属粒子、またはムライト（３Ａ
１２０３ ・２ＳｉＯ２）、ｆタン酸アルミニウム（
Ａ １２０３ ・Ｔ ｉ ０２ ）、ジルコン（Ｚ
ｒ Ｏ２、Ｓ ｓ○２）、フォルステライト （２Ｍｇ
Ｏ−３ｉ０２ ） 、エンスタタイト （ＭｇＯ−３ｉ
０２）、コーディエライト （２Ｍｇｏ・２Ａ１２ｏ３
・５ＳｉＯ２）、サフィリン（４Ｍｇ０ ・５Ａ１２０
３ ・２Ｓ ｉ ０２ ） 、スポジューメニ（Ｌｉ２
０・Ａｌ２Ｏ３・４ＳｉＯ２）、ユークリプタイト （
Ｌｉ２０・Ａ７！２０３ ・２Ｓ ｉ０２ ） ％ペタ
ライト（Ｌ ｉ２０−Ａｊ２２０３・８Ｓｉ０２）、ベ
リル（３ＢｅＯ・Ａｊ！２０゜・６Ｓ ｉ０２ ）−、
セルジアン（ＢａＯ−Ａ／２０３ ・２ＳｉＯ２）など
の５ｉ０２系もしくはＴｉＯ２系の複合酸化物或いは固
溶体、さらには硫酸バリウム、ステアリン酸亜鉛、炭酸
カルシウムなどの金属塩などが好適なものとして使用さ
れる。In addition, as inorganic solid particles, A1□03, TiO2
, S i02 , ZnO1α-Fe203, single-component metal oxides such as ZrO2, or AI, Tis Zn
, Fe, , Zr, or mullite (3A
1203 ・2SiO2), f aluminum tannate (
A 1203 ・T i 02 ), zircon (Z
r O2, S s○2), forsterite (2Mg
O-3i02), enstatite (MgO-3i
02), cordierite (2Mgo・2A12o3
・5SiO2), sapphirine (4Mg0 ・5A120
3 ・2S i 02), Spodiumeni (Li2
0・Al2O3・4SiO2), eucryptite (
Li20・A7!203・2S i02) %petalite (L i20−Aj2203・8Si02), beryl (3BeO・Aj!20°・6S i02)−,
Suitable examples include 5i02-based or TiO2-based composite oxides or solid solutions such as Selgian (BaO-A/203.2SiO2), and metal salts such as barium sulfate, zinc stearate, and calcium carbonate.
なお、上記の非水系磁気記録媒体用懸濁液には、オルガ
ノシラザンで処理された無機質固体粒子以外に、表面が
親油性を呈し、特にその表面を処理しなくても非水系の
溶媒に良く分散する有機質固形粒子を含んでもよい。In addition, in addition to the inorganic solid particles treated with organosilazane, the above suspension for non-aqueous magnetic recording media has a lipophilic surface and is compatible with non-aqueous solvents even without any special surface treatment. It may also contain dispersed organic solid particles.
〔実施例） 次ぎに、この発明の実施例について説明する。〔Example) Next, embodiments of the invention will be described.
実施例１
構造式
で表されるオルガノシラザンを分散剤として使用し、
α−Ａ１２０３（平均粒径０．８ ３０重量部μｍ１
アルミナ純度＞９９．９９％）
メチルイソブチルケトン ３４〃トルエン
３４〃分散剤
１ 〃の組成物をボールミルで５０時間混合分散
して、非水系磁気記録媒体用懸濁液をｍＭした。Example 1 Organosilazane represented by the structural formula was used as a dispersant, α-A1203 (average particle size 0.8, 30 parts by weight μm1)
Alumina purity>99.99%) Methyl isobutyl ketone 34 Toluene
34 Dispersant
The composition of No. 1 was mixed and dispersed in a ball mill for 50 hours to obtain an mM suspension for a non-aqueous magnetic recording medium.
比較例１
実施例１において、オルガノシラザンに代えてラウリン
酸を分散剤として同量使用した以外は、実施例１と同様
にして非水系磁気記録媒体用懸濁液をｔＪｌｌまた。Comparative Example 1 A non-aqueous magnetic recording medium suspension was prepared in the same manner as in Example 1, except that the same amount of lauric acid was used as a dispersant instead of organosilazane.
比較例２
実施例１において、オルガノシラザンに代えて味の素社
製チタネートカップリング剤ＫＲ−ＴＴＳを分散剤とし
て同量使用した以外は、実施例１と同様にして非水系磁
気記録媒体用懸濁液を調製した。Comparative Example 2 A suspension for non-aqueous magnetic recording media was prepared in the same manner as in Example 1, except that the same amount of Ajinomoto Co.'s titanate coupling agent KR-TTS was used as a dispersant instead of organosilazane. was prepared.
比較例３
実施例１において、オルガノシラザンに代えて味の素社
製アルミニウムカップリング剤ＡＬ−Ｍを分散剤として
同量使用した以外は、実施例１と同様にして非水系磁気
記録媒体用懸濁液を調製した。Comparative Example 3 A suspension for non-aqueous magnetic recording media was prepared in the same manner as in Example 1, except that the same amount of aluminum coupling agent AL-M manufactured by Ajinomoto Co., Ltd. was used as a dispersant instead of organosilazane. was prepared.
比較例４
実施例１において、オルガノシラザンを省いた以外は、
実施例１と同様にして非水系磁気記録媒体用懸濁液を調
製した。Comparative Example 4 Example 1 except that organosilazane was omitted.
A suspension for non-aqueous magnetic recording media was prepared in the same manner as in Example 1.
各実施例および比較例で得られた非水系磁気記録媒体用
無機質固体粒子ト！！濁液において、α−Ａ１２０３の
沈降体積および平均粒径を測定した。Inorganic solid particles for non-aqueous magnetic recording media obtained in each example and comparative example! ! In the suspension, the sedimentation volume and average particle size of α-A1203 were measured.
下記第１表はその結果である。Table 1 below shows the results.
第１表
〔発明の効果〕
上記第１表から明らかなように、無機質固体粒子（α−
Ａ１２０３）表面をアルキレンオキサイドを含むオルガ
ノシラザンで処理したもの（実施例１）は、無処理のも
の（比較例４）および従来の分散剤を用いたもの（比較
例１〜３）に比べ、沈降体積が小さくて、平均粒径が小
さく、このことからこの発明で得られる非水系磁気記録
媒体用懸濁液は、無機固体粒子の分散性および分散安定
性が大きく向上されていることがわかる。その結果、こ
の発明で得られる非水系磁気記録媒体用懸濁液を添加し
た磁気記録媒体は、電気的特性を損なうことなく良好な
物理特性を得ることができる。Table 1 [Effects of the Invention] As is clear from Table 1 above, inorganic solid particles (α-
A1203) The surface treated with an organosilazane containing alkylene oxide (Example 1) had a lower sedimentation rate than the untreated surface (Comparative Example 4) and the surface treated with a conventional dispersant (Comparative Examples 1 to 3). The volume is small and the average particle diameter is small, which indicates that the suspension for non-aqueous magnetic recording media obtained by the present invention has greatly improved dispersibility and dispersion stability of inorganic solid particles. As a result, a magnetic recording medium to which the nonaqueous magnetic recording medium suspension obtained according to the present invention is added can obtain good physical properties without impairing electrical properties.
Claims (1)
子を含むことを特徴とする非水系磁気記録媒体用無機質
固体粒子懸濁液。 ２、オルガノシラザン化合物が、基本単位 ▲数式、化学式、表等があります▼ 〔但し、式中ＲはＲ＿１（Ｒ＿２Ｏ）ｍ（ＣＨ＿２）ｎ
であって、Ｒ＿１は炭素数１〜６のアルコキシ基または
アセトキシル基、Ｒ＿２はアルキレン基、ｍは１以上の
整数、ｎは０〜５の整数であり、Ｒ′およびＲ″は炭素
数１〜６のアルキル基またはアミノ基である。〕 で示されるオルガノシラザン化合物である特許請求の範
囲第１項記載の非水系磁気記録媒体用無機質固体粒子懸
濁液。 ３、無機質固体粒子が、Ａｌ＿２Ｏ＿３、ＳｉＯ＿２、
ＴｉＯ＿２、ＺｎＯ、α−Ｆｅ＿２Ｏ＿３、ＺｒＯ＿２
から選ばれる単成分金属酸化物である特許請求の範囲第
１項および第２項記載の非水系磁気記録媒体用無機質固
体粒子懸濁液。 ４、無機質固体粒子が、Ａｌ、Ｔｉ、Ｚｎ、Ｆｅ、Ｚｒ
から選ばれる金属である特許請求の範囲第１項および第
２項記載の非水系磁気記録媒体用無機質固体粒子懸濁液
。 ５、無機質固体粒子が、ムライト（３Ａｌ＿２Ｏ＿３・
２ＳｉＯ＿２）、チタン酸アルミニウム（Ａｌ＿２Ｏ＿
３・ＴｉＯ＿２）、ジルコン（ＺｒＯ＿２・ＳｉＯ＿２
）、フォルステライト（２ＭｇＯ・ＳｉＯ＿２）、エン
スタタイト（ＭｇＯ・ＳｉＯ＿２）、コーディエライト
（２ＭｇＯ・２Ａｌ＿２Ｏ＿３・５ＳｉＯ＿２）、サフ
ィリン（４ＭｇＯ・５Ａｌ＿２Ｏ＿３・２ＳｉＯ＿２）
、スポジューメニ（Ｌｉ＿２Ｏ・Ａｌ＿２Ｏ＿３・４Ｓ
ｉＯ＿２）、ユークリプタイト（Ｌｉ＿２Ｏ・Ａｌ＿２
Ｏ＿３・２ＳｉＯ＿２）、ペタライト（Ｌｉ＿２Ｏ・Ａ
ｌ＿２Ｏ＿３・８ＳｉＯ＿２）、ベリル（３ＢｅＯ・Ａ
ｌ＿２Ｏ＿３・６ＳｉＯ＿２）、セルジアン（ＢａＯ・
Ａｌ＿２Ｏ＿３・２ＳｉＯ＿２）から選ばれる複合酸化
物あるいは固溶体である特許請求の範囲第１項および第
２項記載の非水系磁気記録媒体用無機質固体粒子懸濁液
。 ６、無機質固体粒子が、硫酸バリウム、ステアリン酸亜
鉛、炭酸カルシウムから選ばれる金属塩である特許請求
の範囲第１項および第２項記載の非水系磁気記録媒体用
無機質固体粒子懸濁液。[Scope of Claims] 1. An inorganic solid particle suspension for a non-aqueous magnetic recording medium, comprising inorganic solid particles treated with an organosilazane compound. 2. Organosilazane compounds are basic units ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ [However, in the formula, R is R_1(R_2O)m(CH_2)n
R_1 is an alkoxy group or acetoxyl group having 1 to 6 carbon atoms, R_2 is an alkylene group, m is an integer of 1 or more, n is an integer of 0 to 5, and R' and R'' are an integer of 1 to 6 carbon atoms. The inorganic solid particle suspension for a non-aqueous magnetic recording medium according to claim 1, which is an organosilazane compound represented by the following: 3. The inorganic solid particles are Al_2O_3, SiO_2,
TiO_2, ZnO, α-Fe_2O_3, ZrO_2
The inorganic solid particle suspension for non-aqueous magnetic recording media according to claims 1 and 2, which is a single-component metal oxide selected from the following. 4. Inorganic solid particles are Al, Ti, Zn, Fe, Zr
The inorganic solid particle suspension for non-aqueous magnetic recording media according to claims 1 and 2, wherein the inorganic solid particle suspension is a metal selected from the following. 5. The inorganic solid particles are mullite (3Al_2O_3.
2SiO_2), aluminum titanate (Al_2O_
3・TiO_2), zircon (ZrO_2・SiO_2
), forsterite (2MgO・SiO_2), enstatite (MgO・SiO_2), cordierite (2MgO・2Al_2O_3・5SiO_2), sapphirine (4MgO・5Al_2O_3・2SiO_2)
, Spodumeni (Li_2O・Al_2O_3・4S
iO_2), eucryptite (Li_2O・Al_2
O_3・2SiO_2), petalite (Li_2O・A
l_2O_3・8SiO_2), beryl (3BeO・A
l_2O_3・6SiO_2), Celsian (BaO・
The inorganic solid particle suspension for non-aqueous magnetic recording media according to claims 1 and 2, which is a composite oxide or solid solution selected from Al_2O_3.2SiO_2). 6. The inorganic solid particle suspension for a nonaqueous magnetic recording medium according to claims 1 and 2, wherein the inorganic solid particles are a metal salt selected from barium sulfate, zinc stearate, and calcium carbonate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61261701A JPS63113932A (en) | 1986-10-31 | 1986-10-31 | Inorganic solid particle suspension for magnetic recording medium |
| US07/114,847 US4895763A (en) | 1986-10-31 | 1987-10-30 | Magnetic recording medium and non-aqueous suspension of inorganic solid particles for use in the production of the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61261701A JPS63113932A (en) | 1986-10-31 | 1986-10-31 | Inorganic solid particle suspension for magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63113932A true JPS63113932A (en) | 1988-05-18 |
Family
ID=17365510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61261701A Pending JPS63113932A (en) | 1986-10-31 | 1986-10-31 | Inorganic solid particle suspension for magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63113932A (en) |
-
1986
- 1986-10-31 JP JP61261701A patent/JPS63113932A/en active Pending
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