JPS58211322A - Coated magnetic powder and its manufacture - Google Patents

Coated magnetic powder and its manufacture

Info

Publication number
JPS58211322A
JPS58211322A JP57093672A JP9367282A JPS58211322A JP S58211322 A JPS58211322 A JP S58211322A JP 57093672 A JP57093672 A JP 57093672A JP 9367282 A JP9367282 A JP 9367282A JP S58211322 A JPS58211322 A JP S58211322A
Authority
JP
Japan
Prior art keywords
magnetic powder
magnetic
organosilicon polymer
powder
polymer
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
Application number
JP57093672A
Other languages
Japanese (ja)
Inventor
Setsu Takeuchi
節 竹内
Tetsuya Imamura
哲也 今村
Akira Ishikawa
彰 石川
Shoji Kobayashi
小林 省治
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.)
Kao Corp
Original Assignee
Kao Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kao Corp filed Critical Kao Corp
Priority to JP57093672A priority Critical patent/JPS58211322A/en
Publication of JPS58211322A publication Critical patent/JPS58211322A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62Record carriers characterised by the selection of the material
    • G11B5/68Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70Record 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
    • G11B5/712Record 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 surface treatment or coating of magnetic particles

Abstract

PURPOSE:To enhance electromagnetic conversion characteristics and magnetic characteristics, by coating magnetic powder with an organosilicon polymer having mol.wt. in a specified range and uniformly dispersing it. CONSTITUTION:The magnetic powder is coated with an organosilicon polymer having 500-8,000, preferably, 1,000-6,000mol.wt. This polymer is a vinyl type polymer contg. silyl groups, composed of a copolymer consisting of at least one kind of monovinyl monomer and at least one kind of divinyl monomer as its main chain, and contains silicon groups added to the terminals or side chains of the main chain, combined with the hydrolyzed groups.

Description

【発明の詳細な説明】 本発明は被覆磁性粉末及びその製造方法に関する。更に
詳しくは、磁気記録再生用磁気テープ、磁気ディスクな
どの磁気記録体の製造において磁性粉末の分散性を改良
して磁性塗料の塗料化を容易に12、塗工性、加工性を
改善して磁気特性を向上させうる被覆磁性粉末及びその
製造方法に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coated magnetic powder and a method for producing the same. More specifically, in the production of magnetic recording media such as magnetic tapes and magnetic disks for magnetic recording and reproduction, the dispersibility of magnetic powder is improved to facilitate the conversion of magnetic paint into paint12, and the coatability and processability are improved. The present invention relates to a coated magnetic powder that can improve magnetic properties and a method for producing the same.

磁気テープ、磁気ディスクなどの磁気記録体中の磁性粉
は高度の分散が要求される。磁気記録体となる磁性膜は
磁性塗料をプラスチックのフィルムやシートの基板上に
均一に塗布して乾燥後、磁性層を鏡面仕上して形成され
るが、塗料中で磁性粉を十分に分散解膠して凝集粒子を
除いておかないと均一で平滑な磁性層を作ることができ
ない。このような磁性粉の凝集粒子による磁性層の不均
一は磁気テープの電磁変換特性および磁気特性に重大ガ
悪影響を及ばず。すなわち出力の低下、ノイズの増大、
ドロップアラ)−/lどの原因と々る。また塗料中の磁
性粉の分散が不良のときけ塗膜物性がイ・良で4久性が
劣り、さらに」−ディオテーブ、VTRテープで要求式
ねるような磁性粉の配向が不十分となり磁気特性が不良
となる。
Magnetic powder in magnetic recording media such as magnetic tapes and magnetic disks requires a high degree of dispersion. The magnetic film that serves as the magnetic recording medium is formed by uniformly coating a magnetic paint onto a plastic film or sheet substrate, drying it, and then giving the magnetic layer a mirror finish. However, the magnetic powder must be sufficiently dispersed and dissolved in the paint. Unless agglomerated particles are removed using glue, a uniform and smooth magnetic layer cannot be created. The non-uniformity of the magnetic layer caused by such agglomerated particles of magnetic powder does not have a serious adverse effect on the electromagnetic conversion characteristics and magnetic properties of the magnetic tape. In other words, the output decreases, the noise increases,
Drop Ala) -/l What causes it. In addition, if the magnetic powder in the paint is poorly dispersed, the physical properties of the paint film will be good, but the durability will be poor.Furthermore, the orientation of the magnetic powder will be insufficient, as in the case of diotaves and VTR tapes, resulting in poor magnetic properties. becomes defective.

仁のように磁性塗料中の磁性粉の分散は磁気記録体の性
能を向上させる上に非常に重要である。従って磁性粉の
分散性の向Hについては種々の観1点から研究されてお
り、磁性塗料配合に適当な界面活性剤を加えて分散性を
改良することが提案されている。このような界面活性剤
としてはアルキルイミダシリン化合物を用いるもの(特
開昭54−s、2so4)、アルキルポリオキシエチレ
ンリン酸エステルをアルキルアミンで中和[7て用いる
もの(特開昭53−78810’t 。
Dispersion of magnetic powder in magnetic paint is very important in improving the performance of magnetic recording media. Therefore, the direction of dispersibility of magnetic powder has been studied from various viewpoints, and it has been proposed to improve the dispersibility by adding a suitable surfactant to the magnetic paint formulation. Examples of such surfactants include those using alkylimidacillin compounds (Japanese Patent Laid-Open No. 1973-S, 2so4), and those using neutralized alkyl polyoxyethylene phosphates with alkyl amines [7] (Japanese Patent Laid-Open No. 53-Sho. -78810't.

長鎖アルキルリン酸エステルヲ用いる本の(%開明54
−147507 、特願昭53−49629 )などの
ようにアミノ2その誘導体、リン酸エステル、ポリオキ
シエチレンリン酸エステル類などを利用することが多い
。また、磁性粉を表面処理してから塗料化すると分散性
が改良されるとする提案があり、アルキルポリオキシエ
チレンリン酸エステルを用いるもの(%開閉54−94
308 、同56−49769)、メタル粉をチタンカ
ップリング剤で処理して分散安定性と同時に磁性塗膜の
経時劣化を防ぐ本の(特開昭56−8847f )、バ
インダーと反応性の官能基をもつシランカップリング剤
を用いるもの(%開閉54−7310)、アミノファン
クショナルシランカップリング剤とインシアネート系化
合物。
Books using long chain alkyl phosphate esters (% Kaimei 54
-147507, Japanese Patent Application No. 53-49629), amino 2 derivatives, phosphoric acid esters, polyoxyethylene phosphoric esters, etc. are often used. In addition, there is a proposal that dispersibility is improved by surface-treating magnetic powder and then turning it into a paint.
308, 56-49769), a book that treats metal powder with a titanium coupling agent to improve dispersion stability and prevent the deterioration of magnetic coatings over time (JP 56-8847f), functional groups reactive with binders. (% opening/closing 54-7310), an aminofunctional silane coupling agent and an incyanate compound.

エポキシ系化合物との反応生成物によって被覆するもの
(特開昭56−145533)などがある。
There is one in which the coating is coated with a reaction product with an epoxy compound (Japanese Unexamined Patent Publication No. 145533/1983).

磁性粉の分散性向上に有利なバインダーを選択して用い
る方法も多く提案されている。また塗料化に当って第1
段階と1−で分散に有利なバインダーのみ、またはこれ
に適当な界面活性剤を加えて混練し、次いで分散には不
利であるが磁性塗膜としての特性の優れたバインダーを
添加1−で短時間混練して分散性の良好な塗料を製造す
る方法も提案さねている。多くの場合、磁性粉の分散に
有利なバインダーとされているものハ硝化綿、塩化ビニ
ル酢酸ビニルコポリマー。
Many methods have been proposed for selecting and using binders that are advantageous in improving the dispersibility of magnetic powder. Also, in making paint, the first
In step 1-, only a binder that is advantageous for dispersion or an appropriate surfactant is added and kneaded, and then a binder that is disadvantageous for dispersion but has excellent properties as a magnetic coating is added. A method of producing a paint with good dispersibility by kneading for a long time has also been proposed. Nitrified cotton, vinyl chloride and vinyl acetate copolymers are often used as binders that are advantageous in dispersing magnetic powders.

ポリビニルブチラール、ポリビニルホルマールなどであ
り、分散に不利なバインダーとされているものけポリウ
レタン樹脂、フェノール樹脂。
Polyvinyl butyral, polyvinyl formal, etc. Monoke polyurethane resin and phenol resin are considered to be binders that are disadvantageous for dispersion.

エポキシ樹脂である。しかしながら、ここでいう分散に
有利なバインダーであっても磁性粉の分散性に必らず1
2本満足できるものではない。
It is an epoxy resin. However, even if the binder is advantageous for dispersion, it does not necessarily affect the dispersibility of magnetic powder.
I'm not satisfied with the two.

これらのバインダーは磁性粉を基板上に固着させる能力
やテープとし7ての諸物性に優れたものでなくてはなら
ず、分散性の良否のみの観点から選ぶことはできない。
These binders must be excellent in the ability to fix the magnetic powder on the substrate and in various physical properties as a tape, and cannot be selected based solely on the quality of dispersibility.

このように磁性塗料の分散性改良に対する多くの研究が
なされてきたに本かかわらず、今だ[満足すべき改良の
段階には到達1〜でおらず、塗料構成成分の改質、塗料
の混線機と混線時間。
Although much research has been carried out on improving the dispersibility of magnetic paints, we have not yet reached the stage of satisfactory improvement. aircraft and crosstalk time.

塗料構成成分の添加順序などの改善により塗料の貯蔵安
定性、塗工特性、塗膜特性など多くの点で改良すること
が要求されている。
There is a demand for improvement in many aspects such as storage stability, coating properties, and coating film properties of paints by improving the order of addition of paint constituents.

一方、磁気テープ、磁気ディスクなどの磁気記録体に使
われる磁性粉に、配録の高密度化。
On the other hand, magnetic powders used in magnetic recording media such as magnetic tapes and magnetic disks are being used to increase the recording density.

低ノイズ化、高周波領域における音響特性の向上のため
粒径けより小さく、抗磁力により大きなものを使うこと
が必要となってきている。磁性粉のr−酸化鉄、コバル
ト被着γ−酸化鉄。
In order to reduce noise and improve acoustic properties in the high frequency range, it has become necessary to use materials that are smaller than the grain size and have larger coercive force. Magnetic powder r-iron oxide, cobalt-coated γ-iron oxide.

メタル粉などげいずilも0.5μ或いはそり、ムJ下
の大きさのものを用いることが必要となっているが、磁
性粉の粒径が小さくなると表面積が大きくカリ、このよ
うか表面エネルギーの高い粒子の分散に回器となる。ま
た、磁性粉に磁気モーメン)[よる粒子間相互作用(吸
引力)によりa通の粉末に比べ分散が内錐である。磁性
粉の分散性が不十分なため磁性塗膜の物性を磁性に1.
て覗1在開発さり、ている分散に有利なバイン汐゛−の
みを選ぶとテープ等の耐久性に悪い影響を−えるため実
用的ではない。
It is also necessary to use metal powder particles with a size of 0.5 μm or less than the warpage, but as the particle size of the magnetic powder becomes smaller, the surface area becomes larger and the surface area becomes larger. It becomes a device for dispersing high-energy particles. In addition, due to the interparticle interaction (attractive force) caused by the magnetic moment (magnetic moment) in the magnetic powder, the dispersion is more conical than that of the a-type powder. Because the dispersibility of the magnetic powder was insufficient, the physical properties of the magnetic coating were changed to 1.
However, if only a binder which is advantageous for dispersion is selected, it is not practical because it will have a negative effect on the durability of the tape, etc.

又、従来、磁性塗料の分散性を向上させるために枡案式
力ている界面活性剤の分散能力に、有機溶媒にこわを溶
解をせ磁性粉を加えて混練した時は非常に優りているが
、この分散系にポリウレタン樹脂のような塗膜特性を良
好にするために必須なバインダーを加えて塗料系とする
と分散性が劣化して凝集するという欠点がある。
In addition, the dispersion ability of surfactants, which have conventionally been used in a systematic manner to improve the dispersibility of magnetic paints, is extremely superior when dissolved in an organic solvent and mixed with magnetic powder. However, if a paint system is prepared by adding a binder such as a polyurethane resin, which is essential for improving coating film properties, to this dispersion system, there is a drawback that the dispersibility deteriorates and agglomeration occurs.

界面活性剤を吸着して溶剤中に分散している磁性粉は溶
剤中にバインダーが存在すると多かれ少なかれその分散
性が影響を受ける。良好な性質をもつ磁性塗膜の可撓性
、耐摩耗性などの必要な物性のたーめに必須なバインダ
ーであるポリウレタン樹脂、塩化ビニル酢酸ビニル共重
合樹脂が共存するときは分散性は特に悪化する。これは
磁性粉表面に界面活性剤が吸着して磁性粉−溶剤界面の
界面エネルギーを低下させて分散安定化しているものが
、バインダーが共存すると界面エネルギーが再び増大し
て分散性が悪化するか又は界面エネルギーが低いままで
バインダーの粒子間架橋などによる凝集作用が起こるか
のいずれかのことが考えられる。
The dispersibility of magnetic powder that adsorbs a surfactant and is dispersed in a solvent is more or less affected by the presence of a binder in the solvent. Dispersibility is particularly poor when polyurethane resins and vinyl chloride-vinyl acetate copolymer resins, which are essential binders for magnetic coatings with good properties such as flexibility and abrasion resistance, coexist. Getting worse. This is because the surfactant is adsorbed to the surface of the magnetic powder, lowering the interfacial energy at the magnetic powder-solvent interface and stabilizing the dispersion, but when a binder coexists, the interfacial energy increases again and the dispersibility worsens. Alternatively, it is conceivable that agglomeration occurs due to interparticle crosslinking of the binder while the interfacial energy remains low.

本発明者らはバインダーの凝集作用の原因を知るべくバ
インダーの共存下における磁性粉表面への界面活性剤の
吸着量を調べたところ、分散性に悪い影響を与えるバイ
ンダーはその吸着量を著1−〈低下式せ成る種の界面活
性剤−バインダーの組合せにおいてに篤ろくべきことに
吸着を逢を零に1.てし、壕うことが判明1.た。本発
明者等はこの事実に基づきいか々るバインダーの共存に
おいても磁性粉表面から脱着せずに染らに塗料系中で強
磁性粉末粒子が最もよく分散する′7′iTぬに心間な
表面コート層の構造につき鋭意研究の結果、本発明を完
成するに至ったものである。
The present inventors investigated the amount of surfactant adsorbed to the magnetic powder surface in the presence of binder in order to understand the cause of binder agglomeration, and found that binder, which has a negative effect on dispersibility, significantly reduced the amount of surfactant adsorbed to the magnetic powder surface. - The type of surfactant-binder combination that preferably reduces adsorption to zero 1. However, it turns out that there is a problem.1. Ta. Based on this fact, the present inventors have determined that ferromagnetic powder particles are best dispersed in the paint system without being desorbed from the magnetic powder surface even in the coexistence of any binder. As a result of intensive research into the structure of the surface coating layer, the present invention was completed.

即ち、本発明に、各種ノコンダーの共存下においても優
ノ1.た分散性を有する、磁性粉末が分子量500〜s
、oooのオルガノシリコン重合体により被i−Jれて
なる被覆磁性粉末を提供するものである。
That is, in the present invention, even in the coexistence of various types of noconders, the superiority 1. The magnetic powder has a molecular weight of 500 to s.
, ooo coated magnetic powder coated with i-J organosilicon polymers.

磁性塗料に本発明の被覆磁性粉末を使用することにより
、磁性粉末を均一に分散することができ、電磁変換特性
および磁気特性の優れた磁気記録体を得ることができる
By using the coated magnetic powder of the present invention in a magnetic coating material, the magnetic powder can be uniformly dispersed, and a magnetic recording medium with excellent electromagnetic conversion characteristics and magnetic properties can be obtained.

本発明の被覆磁性粉末は、磁性粉末をオルガノシリコン
重合体で表面処理することにより構造し得る。
The coated magnetic powder of the present invention can be structured by surface treating the magnetic powder with an organosilicon polymer.

本発明に係わるオルガノシリコン重合体とは分子量50
0〜8,000好ましくは1.ODD〜6.oo。
The organosilicon polymer according to the present invention has a molecular weight of 50
0 to 8,000 preferably 1. ODD~6. oo.

のシリル基含有ビニル系重合体であってその主鎖として
モノとニルモノマーの1種又は2種以上およびジビニル
モノマーの181[又H211!以上の共重合体からか
り、加水分解性基と結合した珪素基を主鎖ポリマーの末
端および/または側鎖に付加した化合物である。
is a silyl group-containing vinyl polymer whose main chain is one or more of mono- and nyl monomers and divinyl monomer 181 [also H211! It is a compound made from the above copolymer and in which a silicon group bonded to a hydrolyzable group is added to the terminal and/or side chain of the main chain polymer.

本発明に使用できるモノビニルモノマーとしては、ブチ
レン、イソブチレン、ヘキセン、ジイソブチレン等のオ
レフィン類、アクリル酸メチル、アクリル酸エチル、ア
クリル酸ブチル。
Monovinyl monomers that can be used in the present invention include olefins such as butylene, isobutylene, hexene, and diisobutylene, methyl acrylate, ethyl acrylate, and butyl acrylate.

アクリル酸オクチル等のアクリル酸エステル、メタクリ
ル酸メチル、メタクリル酸エチル、メタクリル酸ブチル
、メタクリル酸オクチル、メタクリル酸ドデシル等のメ
タクリル酸エステル、アクリル酸アミド、N−メチロー
ルアクリルアミド、メタクリル酸アミド、N−メチロー
ルメタクリルアミド等のアミド基含有ビニルモノマー、
メチルビニルエーテル、インフチルビニルエーテル、オ
クチルビニルエーテル、2−クロロエチルビニルエーテ
ル、アミンエチルビニルエ−テル チルアクリレート、ジエチルアミノエチルメタクリレー
ト、N−ビニルピロリドン、N−ビニルコハク酸イミド
、アクリルニトリル、メタクリル酸アリル,N− ビニ
ルコノ1り酸イミド等の含窒IF’r 系ビニルモノマ
ー類、スチレン、αーメチルスチレン+ p  Zチル
スチレン等のスチレン銹導体、グリシジル丁りリl/−
ト,グリシジルメタクリレート等のエポキシ含有モノマ
ー、その他酢酸ビニル、無水マレイン酸,フマール酸ジ
エチル、塩化ビニル、塩化ビニ1ノデン等力;あげられ
る。
Acrylic esters such as octyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, octyl methacrylate, methacrylic esters such as dodecyl methacrylate, acrylic amide, N-methylolacrylamide, methacrylic amide, N-methylol Vinyl monomers containing amide groups such as methacrylamide,
Methyl vinyl ether, inphthyl vinyl ether, octyl vinyl ether, 2-chloroethyl vinyl ether, amine ethyl vinyl ether thyl acrylate, diethylaminoethyl methacrylate, N-vinylpyrrolidone, N-vinylsuccinimide, acrylonitrile, allyl methacrylate, N-vinylcono Nitrogen-containing IF'r-based vinyl monomers such as monostyrene imide, styrene, α-methylstyrene + styrene rust conductors such as pZ styrene, glycidyl salt/-
and epoxy-containing monomers such as glycidyl methacrylate, vinyl acetate, maleic anhydride, diethyl fumarate, vinyl chloride, and vinyl chloride.

本発明に使用することができるジビニルモノマーは特に
制限はないが非架橋性ジビニルモノマーが望ましい。例
えばアクリル酸ア1ノル、メタクリル酸アリル等のジビ
ニル化合物がJ)けられる。また、ジアリルフタレート
、ジピニルベンゼン等のジビニルモノマーも上記ビニル
モノマーとの混合比が小さいときには使用することがで
きる。
The divinyl monomer that can be used in the present invention is not particularly limited, but non-crosslinkable divinyl monomers are preferred. For example, divinyl compounds such as allyl acrylate and allyl methacrylate are used. Further, divinyl monomers such as diallylphthalate and dipinylbenzene can also be used when the mixing ratio with the above vinyl monomers is small.

本発明になるオルガノシリコン重合体の主鎖II+:な
るビニルオリゴマーの製造法の1つにビニルモノマーと
ジビニルモノマーとを混合して共重合させる方法がある
。ジビニルモノマーの混合比は加水分解性基を有する珪
素化合物を導入する清によって決めることが適当である
。即ちオルガノシリコン重合体中のシリル基含有針を多
くするときにけそfI VC比例してジビニルモノマー
の混合服を多くし、シリル基含有址を少なくするときV
Cは少なくする。
One of the methods for producing the vinyl oligomer consisting of main chain II+ of the organosilicon polymer according to the present invention is a method of mixing and copolymerizing a vinyl monomer and a divinyl monomer. It is appropriate that the mixing ratio of divinyl monomers is determined by the composition into which the silicon compound having a hydrolyzable group is introduced. That is, when increasing the number of silyl group-containing needles in the organosilicon polymer, V
Reduce C.

FK主fiの主要成分とかkfrるモノビニルモノマー
の選択は生成したオルガノシリコン重合体が磁性塗料に
用いる有機溶剤に溶解すること、磁性塗料に用いるバイ
ンダーとの相溶性がよいことに留mして行なわノする。
The selection of monovinyl monomers, such as the main components of FK main fi and kfr, was carried out keeping in mind that the produced organosilicon polymer is soluble in the organic solvent used in the magnetic paint and has good compatibility with the binder used in the magnetic paint. No.

また、本発明になるオルガノシリコン重合体の分子是#
″:j 500〜a、ooo、好まり、 < i、t 
+、ono −s、oooであるが、分子礒をこの範囲
にコントロールするために重合系に各種アルギルメルカ
プタン(例L i、f n −オクチルメルカプタン、
t−ドデシルメルカプタン等)を適当h1添加を−で行
うことができる。
Furthermore, the molecular structure of the organosilicon polymer according to the present invention is
″: j 500~a, ooo, preferred, < i, t
+, ono -s, ooo, but in order to control the molecular weight within this range, various argyl mercaptans (e.g. Li, f n -octyl mercaptan,
(t-dodecyl mercaptan, etc.) can be suitably added at -.

オルガノシリコン重合体の主鎖の特性およびその分子琺
を上記のように選ぶことによって磁性塗料中における磁
性粉の分散安定化、磁性塗膜中における磁性粉とバイン
ダーとの接着性を向上させることができる。
By selecting the characteristics of the main chain of the organosilicon polymer and its molecular phosphorus as described above, it is possible to stabilize the dispersion of the magnetic powder in the magnetic paint and improve the adhesion between the magnetic powder and the binder in the magnetic paint film. can.

上記のモノビニルモノマーの1種又u2ti以七とジビ
ニルモノマーの1種または2種以上より構成さfするビ
ニル系オリゴマー化合物に、加水分解性基と結合1−か
珪素化合物を結合させることにより本発明に用いるオル
ガノシリコン重合体を製造することができる。
The present invention is achieved by bonding a hydrolyzable group and a silicon compound to a vinyl oligomer compound consisting of one of the above monovinyl monomers or one or more divinyl monomers. It is possible to produce organosilicon polymers used for.

即ち、本発明において用いるオルガノシリコン重合体の
製法としてンよ、次の一般式(ココテa、Hl 〜3c
7)整数、bljO,1’、2より選ばれた整数、RI
IR2ij炭素数1〜8のアルキル基、ア′リール基、
アラリル基より選げ′i+るAN什水素A、xtrsハ
ロゲン、了ルコギシ、ヂオアルコギシ基等の加水分解1
/1基である。)で表わさhるヒドロシラン化合物と前
記ビニル系オリゴマー化合物とをコバルト、ニッケル、
白金等■族遷移金属化合物を触媒と1.て適当な有機溶
媒中で加熱反応させて得ることができる。
That is, as a method for producing the organosilicon polymer used in the present invention, the following general formula (cocote a, Hl ~3c
7) Integer, integer selected from bljO, 1', 2, RI
IR2ij alkyl group having 1 to 8 carbon atoms, aryl group,
Hydrolysis of AN dihydrogen A, xtrs halogen, ryokogishi, dioalkogyshi group, etc. selected from aralyl group 1
/1 unit. ) The hydrosilane compound represented by h and the vinyl oligomer compound are combined with cobalt, nickel,
Using a group II transition metal compound such as platinum as a catalyst 1. It can be obtained by heating and reacting in a suitable organic solvent.

本発明において用いるオルガノシリコン重合体の他の製
法は次の一般式 (ここでaは1〜5の整数、R3け重合性ビニル基を有
する有機残基、R2u炭素数1〜8のアルキル基、了り
−ル基、アラリル基より選ばれる炭化水素基、Xはハロ
ゲン、アルコキシ、チオアルコキシ基等の加水分解性基
である)で表わサレルビニル系シラン化合物と前記のモ
ノビニルモノマーをラジカル重合することにより得るこ
とができる。ビニル系シラン化合物のビニル共重合体に
対する混合比はビニルモノマ一単位で2〜20個に対1
.て1個である。
Another method for producing the organosilicon polymer used in the present invention is the following general formula (where a is an integer of 1 to 5, R3 is an organic residue having a polymerizable vinyl group, R2u is an alkyl group having 1 to 8 carbon atoms, Radical polymerization of a salervinyl-based silane compound represented by a hydrocarbon group selected from an aralyl group and an aralyl group, where X is a hydrolyzable group such as a halogen, alkoxy group, or a thioalkoxy group, and the above-mentioned monovinyl monomer. It can be obtained by The mixing ratio of the vinyl silane compound to the vinyl copolymer is 1 to 2 to 20 units of vinyl monomer.
.. There is one piece.

こわらのオルガノシリコン重合体の磁性粉末表面への被
接に有機溶剤にオルガノシリコン重合体を溶解51.た
後、磁性粉末を投入j−撹拌混合後痙別1.て加熱乾燥
することによって行うことができる。また、他の処理方
法としてはオルガノシリコン重合体溶液を流動圧装Rま
たはヘンシエルミキザーなどの粉体攪拌機中で磁性粉末
VC直接スプレーコーディングした後100℃以上に加
熱乾燥することによってもできる。さらに、他の処理方
法と1.ては高沸点非活性有機溶媒中にオルガノシリコ
ン重合体を溶解した後、磁性粉末を投入して煮沸還流し
て反応きせた後高沸点溶剤を濾過・洗浄して処理磁性粉
末を得ることもできる。
51. Dissolve the organosilicon polymer in an organic solvent to apply the stiff organosilicon polymer to the surface of the magnetic powder. After mixing, add the magnetic powder and stir to separate the spasms.1. This can be done by heating and drying. Another treatment method is to directly spray-coat the organosilicon polymer solution with magnetic powder VC in a powder mixer such as a fluid pressure device R or a Henschel mixer, and then heat dry it to 100° C. or higher. Furthermore, other processing methods and 1. Alternatively, the treated magnetic powder can be obtained by dissolving the organosilicon polymer in a high-boiling inert organic solvent, then adding the magnetic powder, boiling and refluxing to quench the reaction, and then filtering and washing the high-boiling solvent. .

このような処理によりオルガノシリコン重合体のアルコ
キシ基等の加水分解性基は磁性粉末表面で加水分解され
オルガノシリコンm合体り固定される。
By such treatment, the hydrolyzable groups such as alkoxy groups of the organosilicon polymer are hydrolyzed on the surface of the magnetic powder, and the organosilicon m is combined and fixed.

オルガノシリコン重合体の使用量は、磁性粉末に対11
重N比で0.2〜2(1%、好ましくは0.5〜5チで
ある。
The amount of organosilicon polymer used is 11 times the amount of magnetic powder.
The gravity N ratio is 0.2 to 2 (1%, preferably 0.5 to 5).

このようにして表面処理1.た強磁性微粉末に塗料化に
際して溶剤によくなじみ、分散安定化のためr浸漬り厚
さの吸着層を有1−.ているから磁性塗料の分散安定性
が大きく塗工j−易く、磁場配向により強磁性体粒子が
配向し易く、磁性膜の均一性が高く、従ってこの磁気記
録体の電磁特性は優れたものとなる。
In this way, surface treatment 1. The ferromagnetic fine powder is well compatible with solvents when it is made into a paint, and has an adsorption layer of r immersion thickness to stabilize dispersion. Because of this, the dispersion stability of the magnetic paint is high and it is easy to apply, the ferromagnetic particles are easily oriented by magnetic field orientation, and the magnetic film is highly uniform, so the electromagnetic properties of this magnetic recording material are excellent. Become.

本発明に用いる磁性粉としては針状形の微細なr−Fe
20. 、  Fe、O,、、(’!ro2  のよう
な金属酸化物、また00被着r−FeOOoドープr−
Fe20゜2 うt のような加工れ理をMl、たr Fe2es 、鉄メタ
ル粉などが挙げられる。こhらのうち鉄メタル粉は特に
化学的安定性が悪いからこの改良のためニッケル、コバ
ルト、チタン、ケイ素、アルミニウムなどを金属原子、
塩および酸化物の形で少量加えたり表面処理されること
があるが、とf′15らを用いることもできる。鉄メタ
ル粉にまたその安定化のため弱い酸化性雰囲気の中で表
面に薄い酸化被膜を作らせることがあるが、このように
処理されたメタル粉を用いることもできる。
The magnetic powder used in the present invention is needle-shaped fine r-Fe.
20. , Fe, O, , ('!ro2), as well as 00 deposited r-FeOOo doped r-
Ml, Fe2es, iron metal powder, etc., can be used to reduce processing defects such as Fe20゜2ut. Of these, iron metal powder has particularly poor chemical stability, so to improve it, metal atoms such as nickel, cobalt, titanium, silicon, aluminum, etc.
Although they may be added in small amounts in the form of salts and oxides or surface treated, and f'15 and the like can also be used. Iron metal powder is sometimes made to form a thin oxide film on its surface in a weakly oxidizing atmosphere in order to stabilize it, and metal powder treated in this way can also be used.

これらの磁性粉の大きさは長軸が1μから0.15μ、
短軸が0.15μから0.015μのものが好ましb0
長軸が1μより大きくなると分散は容易になるが短波長
の記録が不利になったりノイズが大きくなるため好まし
くない。長袖が0.15μより小さくなると本発明にな
る磁気記録体としてもなお分散が困難となる。
The size of these magnetic powders is from 1μ to 0.15μ on the long axis.
It is preferable that the short axis is from 0.15μ to 0.015μ b0
If the long axis is larger than 1 μm, dispersion becomes easier, but recording of short wavelengths becomes disadvantageous and noise becomes large, which is not preferable. If the length of the long sleeve is smaller than 0.15μ, it becomes difficult to disperse the magnetic recording material according to the present invention.

本発明の被覆磁性粉末を用いて磁性塗料を調製する際に
用いられる有機バインダーは有機溶剤に可溶な樹脂バイ
ンダーであり、上記の磁性粉を基板上におよび磁性粉同
志を必要な強さで固着して磁性層とするためにできるだ
け少量でその役割をはたすものであればよく、従来塗料
中の磁性粉の分散性を悪化する懸念のあるものも通常の
塗料化方法で用いることができる。こレラの樹脂バイン
ダーの例としてはポリウレタン、ポリエステル、ポリ塩
化ビニル、塩化ビニル酢酸ビニル共重合体、ポリアクリ
ルニトリル。
The organic binder used when preparing a magnetic paint using the coated magnetic powder of the present invention is a resin binder that is soluble in an organic solvent. Any material that can be used in as small a quantity as possible to fulfill its role in fixing to form a magnetic layer can be used, and even materials that are likely to deteriorate the dispersibility of magnetic powder in conventional paints can be used in normal paint-forming methods. Examples of resin binders for cholera include polyurethane, polyester, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, and polyacrylonitrile.

ニトリルゴム、エポキシ樹脂、アルキッド樹脂。Nitrile rubber, epoxy resin, alkyd resin.

ポリアミド、ポリアクリル酸エステル、ポリメタクリル
酸エステル、ポリ酢酸ビニル、ポリビニルブチラール、
塩化ビニリデン、塩化ビニリデン共重合体、硝化綿、エ
チルセルロースなどが挙げちれるがこれらに単独で用い
てもよいが、通常2種類以上混合して用いられる。また
樹脂の硬さを調節するため可塑剤や硬化剤を加えて使用
することもできる。
Polyamide, polyacrylic ester, polymethacrylic ester, polyvinyl acetate, polyvinyl butyral,
Vinylidene chloride, vinylidene chloride copolymer, nitrified cotton, ethyl cellulose, etc. may be used alone, but two or more types are usually used as a mixture. Further, in order to adjust the hardness of the resin, a plasticizer or a hardening agent may be added.

バインダーの配合量ケ被覆磁性粉末100重量部に対し
て15〜60重敵部である。最も大きな結合力を有する
バインダーであっても15重量部より少ないときは磁性
塗膜の強度が弱くまた基板と磁性塗膜の接着力が不足と
なる。また60重量部より多いと1!!は磁性塗膜中の
磁性粉濃度が小さくなって再生出力が低下して不利であ
るし、また塗膜特性が低下することもある・溶剤は使用
するバインダーに対して溶解力を有しかつ沸点が50℃
から150℃の間にあるものが望ま[7い。沸点が低す
ぎると塗布後磁性粉の磁場配向する前に乾燥1.てしま
いこの処理をすることができない。バインダーの種類に
対応して上記の観点から選択されるが毒性や環境の問題
を考@して選ぶべきことはいうまでもない。
The blending amount of the binder is 15 to 60 parts by weight per 100 parts by weight of the coated magnetic powder. Even if the binder has the highest binding strength, if it is less than 15 parts by weight, the strength of the magnetic coating will be weak and the adhesive strength between the substrate and the magnetic coating will be insufficient. Also, if it is more than 60 parts by weight, it is 1! ! This is disadvantageous because the concentration of magnetic powder in the magnetic coating film becomes small and the reproduction output decreases, and the properties of the coating film may also deteriorate.The solvent has a dissolving power for the binder used and has a boiling point. is 50℃
and 150°C [7. If the boiling point is too low, the magnetic powder must be dried before being oriented in the magnetic field after coating.1. I can't do this because it's too late. The binder is selected from the above viewpoints depending on the type of binder, but it goes without saying that it should be selected with consideration to toxicity and environmental issues.

本発明の被覆磁性粉末を用いることにより、磁性塗判製
造において著L <分散性を向上させることができ、塗
工性、加工性に優れ電磁特性の優れた磁気記録体を製造
することができる。
By using the coated magnetic powder of the present invention, it is possible to significantly improve dispersibility in the production of magnetic coatings, and it is possible to produce magnetic recording bodies with excellent coatability and processability, and excellent electromagnetic properties. .

以下実施例をもって本発明を詳述するが、本発明はこれ
に限定されるものではない。
The present invention will be described in detail below with reference to Examples, but the present invention is not limited thereto.

実施例−1 キシレン400?にアクリル酸n−ブチル50f2メタ
クリル酸メチル507.メタクリル酸アリル25f、n
−ドデシルメルカプタン82を4ツロフラスコに仕込み
、攪拌しながら85〜90℃に昇温し九後アゾビスイソ
ブチロニトリル51をキシレン50rに溶かした溶液を
滴下1.なから7時間反応を行った。反応生成物の分子
量は蒸気圧降下法による測定の結果4200であった。
Example-1 Xylene 400? n-butyl acrylate 50f2 methyl methacrylate 507. Allyl methacrylate 25f, n
-Dodecyl mercaptan 82 was placed in a 4-ton flask, heated to 85-90°C with stirring, and then a solution of azobisisobutyronitrile 51 dissolved in xylene 50r was added dropwise.1. The reaction was carried out for 7 hours. The molecular weight of the reaction product was 4200 as measured by vapor pressure drop method.

この生成物の赤外吸収スペクトルに汀了すル基に基づ(
1650crn−’の吸収があり、アリル基含有ビニル
共重合オリゴマーが得られたことを認めた。
Based on the group that appears in the infrared absorption spectrum of this product (
There was an absorption of 1650 crn-', and it was confirmed that an allyl group-containing vinyl copolymer oligomer was obtained.

−に記反応生成物80y、ジメトキシプロピルシラン3
5F、トルエン300r、シクロヘキセンに溶解した塩
化白金錯体0,001 Fを冷却還流管付フラスコに仕
込み、窒素ガス気流中で6時間加熱還流をせながらシリ
ル化反応を行なった。反応波減圧加温[、てトルエンお
よび未反応のジメトキシプロピルシランを除きオルガノ
シリコン重合体を得た。この重合体の赤外吸収スペクト
ルにはアリル基に基づ(1650m−’の吸収は消失I
7ており、アリル基がシリル化されていることを認めた
- Reaction product 80y, dimethoxypropylsilane 3
5 F, 300 r of toluene, and 0,001 F of platinum chloride complex dissolved in cyclohexene were charged into a flask equipped with a cooling reflux tube, and the silylation reaction was carried out while heating under reflux for 6 hours in a nitrogen gas stream. After the reaction wave was heated under reduced pressure, toluene and unreacted dimethoxypropylsilane were removed to obtain an organosilicon polymer. The infrared absorption spectrum of this polymer is based on the allyl group (absorption at 1650 m-' disappears at I
7, and it was recognized that the allyl group was silylated.

冷却管付4ツTコフラスコに長軸径0.44;μ。4 T flask with condenser tube, long axis diameter 0.44 μ.

軸比1/8のr Fe2O,f 00 ? p ) ル
エン400 mlを仕込み、攪拌懸濁後、上に述べたよ
うにして得たオルガノシリコン重合体2vを加え加熱還
流しガから5時間反応を行なった。反応後、トルエンを
濾過して除き、トルエンにより洗浄濾過を繰り返した後
乾燥粉砕して表面処理磁性粉末を得た。
r Fe2O with axial ratio 1/8, f 00 ? p) 400 ml of toluene was charged, and after stirring and suspending, 2 vol of the organosilicon polymer obtained as described above was added, and the mixture was heated under reflux and reacted for 5 hours. After the reaction, toluene was removed by filtration, and the mixture was washed and filtered with toluene repeatedly, and then dried and ground to obtain a surface-treated magnetic powder.

実施例−2 実施例−1において用いたジメトキシプロピルシラン3
5fを18fに減少させる以外は全く同様の方法により
オルガノシリコン重合体を得た−0この重合体の赤外吸
収スペクトルにはアリル基に基づ(165Uz  の吸
収が小さくなっており、アリル基の一部分がシリル化さ
れていることを認めた。このオルガノシリコン重合体を
用い、実施例−1において述べたと全く同様の手法によ
り表面処理磁性粉末を得た。
Example-2 Dimethoxypropylsilane 3 used in Example-1
An organosilicon polymer was obtained in exactly the same manner except that 5f was reduced to 18f. It was confirmed that a portion of the powder was silylated.Using this organosilicon polymer, a surface-treated magnetic powder was obtained in exactly the same manner as described in Example-1.

実施例−3 キシレン4002にスチレン40v、メタクリル酸メチ
ル602.メタクリル酸アリル25f、n−ドデシルメ
ルカプタン61を4ツ[1フラスコに仕込み、 71拌
しながら85〜90℃に’A 57. iか後丁ゾビス
イソプチロニトリル5fをキシレン502に溶か[、た
溶液を滴下L2kから7時間反応を行frつな。反応生
成物の分子量は蒸気圧降下法による測定の結:!P29
00であった。
Example-3 xylene 4002, styrene 40v, methyl methacrylate 602. 57. Allyl methacrylate 25f and n-dodecyl mercaptan 61 were placed in 4 flasks and heated to 85-90°C with stirring. After dissolving zobisisobutyronitrile 5f in xylene 502, the solution was added dropwise and the reaction was continued for 7 hours. The molecular weight of the reaction product is determined by the vapor pressure drop method:! P29
It was 00.

この生成物の赤外吸収スペクトルにはアリル基に基づく
1644’cm−2の吸収があり、アリル基含廟ピール
共重合体オリゴマーが得らfまたことを昭めた。
The infrared absorption spectrum of this product showed an absorption at 1644'cm-2 due to allyl groups, indicating that an allyl group-containing peel copolymer oligomer was obtained.

上記+y応生成物90v、ジェトキシメチルシラン40
9.トルエン40 +39 、シクロヘキセンに溶解1
.た塩化白金錯体11.001 Fを冷却還流管伺フラ
スコに仕込み、窒素ガス気流中で6時間還流撚せ外がら
シリル化反応を行在った。反応後減圧加湛I7てトルエ
ンおよび未反応ジェトキシメチルシランを除きオルガノ
シリコン重合体を得た。この重合体の赤外吸収スペクト
ルにはアリル基に基づ(1644cm−’の吸収は消失
し2でおり、アリル基がシリル化されていることをVめ
た。
90v of the above +y reaction product, 40v of jetoxymethylsilane
9. Toluene 40 +39, dissolved in cyclohexene 1
.. The platinum chloride complex 11.001 F was charged into a flask equipped with a cooling reflux tube, and the silylation reaction was carried out while refluxing and twisting in a nitrogen gas stream for 6 hours. After the reaction, toluene and unreacted jetoxymethylsilane were removed by vacuum filling I7 to obtain an organosilicon polymer. In the infrared absorption spectrum of this polymer, the absorption at 1644 cm-' disappeared and was 2 based on the allyl group, indicating that the allyl group was silylated.

このようにして得たオルガノシリコン重合体を用いて実
施例−1において述べたと同様の手順により表面処理磁
性粉末を得た。
Using the organosilicon polymer thus obtained, a surface-treated magnetic powder was obtained in the same manner as described in Example-1.

実施例−4 実施例−3において述べたオルガノシリコン重合体の製
法においてジェトキシメチルシラン402を2DfK減
少させる以外は同様の方法によりオルガノシリコン重合
体を得た。この重合体の赤外吸収スペクトルはアリル基
に基づく1644− の吸収が小さくなっており、アリ
ル基の一部分がシリル化されていることを緑めた。
Example 4 An organosilicon polymer was obtained in the same manner as described in Example 3 except that jetoxymethylsilane 402 was reduced by 2DfK. In the infrared absorption spectrum of this polymer, the absorption of 1644- based on the allyl group was small, indicating that a portion of the allyl group was silylated.

このオルガノシリコン重合体を用い、実施例−1におい
て述べたと同様の手順により表面処理磁性粉末を得た。
Using this organosilicon polymer, a surface-treated magnetic powder was obtained in the same manner as described in Example-1.

実  施  例−5〜8 実施例−1〜4において用いたr−Fe2J、の代りに
長軸径0.361tm 、 qqi比1/’10のco
被被着−Fe、、O。
Examples 5 to 8 Instead of r-Fe2J used in Examples 1 to 4, co
Adhered to -Fe,,O.

を用い、実施例−1〜4において用いたオルガノシリコ
ン重合体を用い、実施例−1におい°て述べたと同様の
手順により表面処理磁性粉末を得た。
A surface-treated magnetic powder was obtained using the organosilicon polymer used in Examples 1 to 4 in the same manner as described in Example 1.

実  施  例  −9 キシレン4 [] OS’に1−オクテン32?、無水
マレイン酸32.7 r 、ビニルトリエトキシシラン
452.アゾビスイソブチロニトリル42を4ツ1」フ
ラスコに仕込み、攪拌しながら80〜85℃に昇温する
。メタクリル酸エチル40Fとキシレン602の混合溶
液を5時間に亘って滴下反応させた。反応後減圧下加温
1−でキシレンを除去してオルガノシリコン重合体を得
た。
Example -9 Xylene 4 [] 1-octene 32 in OS'? , maleic anhydride 32.7 r, vinyltriethoxysilane 452. Four 1'' flasks were charged with azobisisobutyronitrile 42, and the temperature was raised to 80 to 85°C while stirring. A mixed solution of ethyl methacrylate 40F and xylene 602 was added dropwise to react for 5 hours. After the reaction, xylene was removed by heating under reduced pressure to obtain an organosilicon polymer.

仁の重合体の分子iは蒸気圧降下法で測定I〜で570
0であった。
The molecule i of the polymer is 570 as measured by the vapor pressure drop method.
It was 0.

このように1.て得たオルガノシリコン重合体により実
施例−1において用いたr−Fe20.を同様の手順に
より表面処理17表面処理磁性粉を得た。
In this way 1. r-Fe20. used in Example-1 using the organosilicon polymer obtained by Surface-treated magnetic powder No. 17 was obtained using the same procedure.

比較例−1 キシレン400fにアクリル酸n−ブチル502、メタ
クリル酸メチル50?、メタクリル酸アリル259.n
−ドデシルメルカプタン0.5tを4ツロフラスコに仕
込み、攪拌しながら85〜90℃に−f) ?J、Mし
た後アゾビスイソブチロニトリル3yをキシレン502
に溶かした溶液を滴下したから7時間反応を行った。反
応生成物の分子@は蒸気圧降下法による測定の結果14
.000であった。
Comparative Example-1 400f xylene, 502 ml of n-butyl acrylate, 50 ml of methyl methacrylate. , allyl methacrylate 259. n
-Pour 0.5 t of dodecyl mercaptan into a 4-ton flask and heat to 85-90°C while stirring -f) ? After J and M, azobisisobutyronitrile 3y was converted into xylene 502
The solution dissolved in the solution was added dropwise, and the reaction was carried out for 7 hours. Molecules of the reaction product @ are the result of measurement by vapor pressure drop method14
.. It was 000.

上記反応生成物802.ジメトキシプロピルシラン35
F、)ルエン5oot、シクロヘキセンに溶解1.て塩
化白金錯体0.001 Fを冷却還流管付フラスコに仕
込み、窒素ガス気流中で6時間加熱還流させなからシリ
ル化反応を行なった。反応後減圧加温してトルエンおよ
び未反応ジメトキシプロピルシランを除きオルガノシリ
コン重合体を得た。
The above reaction product 802. Dimethoxypropylsilane 35
F.) 5oot of toluene dissolved in cyclohexene 1. 0.001 F of platinum chloride complex was charged into a flask equipped with a cooling reflux tube, and the mixture was heated under reflux for 6 hours in a nitrogen gas stream to carry out the silylation reaction. After the reaction, toluene and unreacted dimethoxypropylsilane were removed by heating under reduced pressure to obtain an organosilicon polymer.

このようにして得た重合体を用い実施例−1において述
べた方法と同様の手順により表面処理磁性粉末を得た。
Using the thus obtained polymer, a surface-treated magnetic powder was obtained in the same manner as described in Example-1.

比較例−2 磁性粉末として実施例−5〜8において用いたCO被被
着−Fe20.100 ? 、メチルエチルケトン20
0 ? 、シクロヘキサノン200 ? 、各種油中分
散剤2fの混合スラリーを作って、分散安定性試験、磁
性塗料化試験に供1.た。
Comparative Example-2 CO deposition used in Examples 5 to 8 as magnetic powder -Fe20.100? , methyl ethyl ketone 20
0? , cyclohexanone 200? A mixed slurry of various in-oil dispersants 2f was prepared and subjected to a dispersion stability test and a magnetic coating test.1. Ta.

実施例−10 実施例−1〜9および比較例−1で70た被覆磁Ftp
m末s o yをメチルエチルケトン1υOy。
Example-10 70 coated magnetic Ftp in Examples-1 to 9 and Comparative Example-1
1 υOy of methyl ethyl ketone.

シクロへキサノン1ooyと混合1−7でサンドミルに
より2時間混練してミルペースを作った。
A mill paste was prepared by kneading 100 y of cyclohexanone and Mixing 1-7 using a sand mill for 2 hours.

こハらのミルペース及び比較例−2で得た混合スラリー
中の磁性粉末の分散解膠状態をミルペース等の少Mをフ
ィルム上で乾燥させた後走査型電子顕微鏡写真を観察1
−で判定り、た。また、ミルペース等の保存安定性を1
週間保存後の沈降ケークの状態および再借拌後の分散解
III状、?l!II全上に述べた走査型γ「子ガ1微
鏡写真法によって判定した。
The dispersion and peptization state of the magnetic powder in the mixed slurry obtained in Kohara's MilPase and Comparative Example-2 was observed by scanning electron micrograph after drying a small M such as MilPase on a film 1
-Judged by ta. In addition, the storage stability of Milpace etc.
The state of the sediment cake after storage for a week and the state of dispersion after re-borrowing, ? l! II. Scanning gamma larvae were determined by microphotography as described above.

これらの実験の結果は表−1VC示す通りであった。こ
れらの結果より本発明になる被覆磁性粉末の分散性が優
れていることがわかる。
The results of these experiments were as shown in Table 1VC. These results show that the coated magnetic powder of the present invention has excellent dispersibility.

実施例−11 実施例−10において作ったミルベース各々150F、
塩化ビニル酢酸ビニル樹脂(VAGH。
Example-11 The mill bases made in Example-10 were each 150F,
Vinyl chloride vinyl acetate resin (VAGH).

u、c、c H) 4.5 f 、ポリウレタン樹脂に
ツボラン5052.日本ウレタン(株)製)32.メチ
ルエチルケトン15f、シクロヘキサノン152の混合
物をサンドグラインダーにより30分間混練して磁性塗
料を得た。
u, c, c H) 4.5 f, Tuboran 5052. in polyurethane resin. (manufactured by Nippon Urethane Co., Ltd.) 32. A mixture of methyl ethyl ketone 15f and cyclohexanone 152 was kneaded for 30 minutes using a sand grinder to obtain a magnetic paint.

これらの塗料をポリエステルフィルム上に乾燥磁性塗膜
が4μmVC々るように塗布して磁場配向を行なった後
熱風乾燥した。この磁性塗膜をカレンダー処理して平滑
化して磁気記録体を得た。これについて磁気特性を評価
した。これらの実験の結果は表−2に示す通りであった
These paints were coated on a polyester film so that a dry magnetic film had a thickness of 4 μm VC, and after magnetic field orientation was carried out, the film was dried with hot air. This magnetic coating film was smoothed by calender treatment to obtain a magnetic recording medium. The magnetic properties of this were evaluated. The results of these experiments were as shown in Table-2.

これらの結果より本発明になる被覆磁性粉末を用いて裏
作した磁気記録体は優れた磁気特性を示すことがわかる
These results show that the magnetic recording material prepared using the coated magnetic powder of the present invention exhibits excellent magnetic properties.

手続補正病、(自発) 昭和57年11月19日 特許庁長官 若杉和夫 殿 1 事件の表示 特願昭57−9’3672号 2 発明の名称 被覆磁性粉末およびその製造方法 6 補正をする者 事件との関係  特許出願人 (091+花王石鹸株式会社 4代理人 東京都中央区日本橋横山町1の3中井ビル明細書の特許
請求の範囲及び発明の詳細な説明の欄 6 補正の内容 (1)特許請求の範囲を別紙の如く補正(1)明細書8
頁11行「磁性粉末が」の次に[アリル基を含有するビ
ニル系共重合体のアリル基をシリル化した1を挿入 (1)四8画下から2行1オルガ」の前に[該1を挿入 (1)同9百6行Fおよび」の次に「アリル基含有」を
挿入 (1)回10百16417及び19行1−ジビニル1の
前に1−アリル基含有」を夫々挿入 (1)  同11百1行1−ビニル1の前に「アリル基
含有」を挿入 (1)同11頁6.7及び11行1−ジビニル、1の前
に、1′ア11ル基含有」を夫々挿入(1)同12@1
1行「ジビニル」の前に1−アリル基含有」を挿入 (1)1mJ2!i頁6行「メタクリル酸エチル」を[
−メタクリル酸アリル]と訂正 11)同2く頁末行及び28頁末行「分子址を示す。」
を「分子駿を示1) %実施例9はオルガノシリコン重
合体の分子絹を示す。」と夫々訂正2、特許請求の範囲 500〜8000のオルガノシリコン重合体により被接
されてなる被接磁性粉末。
Procedural amendment disease, (spontaneous) November 19, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1 Indication of the case Patent application No. 1987-9'3672 2 Name of the invention Coated magnetic powder and its manufacturing method 6 Case of person making amendment Relationship with Patent Applicant (091 + Kao Soap Co., Ltd. 4 Agents Nakai Building 1-3 Nihonbashi Yokoyama-cho, Chuo-ku, Tokyo Column 6 of Claims and Detailed Description of the Invention in the Specification Contents of Amendment (1) Patent Amend the claims as attached (1) Description 8
Page 11, line 11, "magnetic powder", then [insert 1, which is a silylated allyl group of a vinyl copolymer containing an allyl group (1) 2 lines from the bottom of the 48th stroke, before 1 orga] Insert 1 (1) Insert "allyl group-containing" after "F and" in line 906. (1) Insert "1-allyl group-containing" in front of 1-divinyl 1 in lines 1016,417 and 19, respectively. (1) Insert "allyl group-containing" in front of 1-vinyl 1, line 11-1101 (1) Insert 1'alyl group-containing before 1-divinyl, 1, lines 6.7 and 11, page 11 ” (1) 12@1
Insert “1-allyl group-containing” before “divinyl” in line 1 (1) 1mJ2! Page i, line 6 “Ethyl methacrylate” [
-Allyl methacrylate] and correction 11) Same as the last line of page 2 and the last line of page 28 "Indicates the molecular structure."
"Example 9 shows the molecular silk of the organosilicon polymer" and amended 2, "Indicates the molecular weight 1) % Example 9 shows the molecular silk of the organosilicon polymer." powder.

500〜8000のオルガノシリコン重合体で表面処理
することを特徴とする被接磁性粉末の製造方法。
1. A method for producing a magnetic powder to be contacted, characterized in that the surface is treated with an organosilicon polymer having a molecular weight of 500 to 8,000.

手続補1ト書(自発) 昭和58年2月 9  Ll 特許庁長官若杉和夫殿 1、事件の表示 特願昭57−93672叶 2、発明の名称 被覆磁性粉末およびその製造方法 3、 補+Eをする講 事件との関係  特?A出願人 (091)花王石帥株式会看 4、  代  理  人 東京都中央区]」本橋横山町1の3中井ビル明細占の発
明の詳細な説明の欄 6、補什の内容 (1)  明細書15頁14〜15行「メタル粉」のの
1種または2挿具りで14換された磁性粉、Go 、 
Fe −Go 、 Fe −Ni等ノ金属または合金の
超微粉」を加入
Supplementary Procedures 1 (Spontaneous) February 1980 9 Ll Kazuo Wakasugi, Commissioner of the Japan Patent Office 1, Patent Application No. 57-93672 No. 2, Name of the Invention Coated Magnetic Powder and Process for Manufacturing the Same 3, Supplement + E Is there a special relationship with the Ko incident? Applicant A (091) Kao Sekisui Co., Ltd. Kan 4, Agent Chuo-ku, Tokyo] Motohashi Yokoyamacho 1-3 Nakai Building Detailed Description of the Invention Column 6, Supplementary Contents (1) Specification page 15, lines 14-15 "Metal powder" Magnetic powder converted into 14 with one or two types of inserts, Go,
Added ultrafine powder of metals or alloys such as Fe-Go, Fe-Ni, etc.

Claims (1)

【特許請求の範囲】 1、 磁性粉末が分子量soo〜8 、000のオルガ
ノシリコン重合体により被ηされてなる被覆磁性粉末。 2、 オルガノシリコン重合体の主鎖がビニル系共重合
体からなり、加水分解性基と結合した珪素基を分子の末
端および/または側鎖に付加I〜でいる化合物である特
許請求の範囲第1項記載の被覆磁性粉末。 3、la磁性粉末分子1i500〜a、oooのオルガ
ノシリコン重合体で表面処理することを特徴とする被覆
磁性粉末の製造方法。 4、 オルガノシリコン重合体の主鎖がビニル系共重合
体からなり加水分解性基と結合した珪素基を分子の末端
および/または側鎖に付加している化合物である特FF
 g*求の範囲第3項記載の被覆磁性粉末の製造方法。
[Scope of Claims] 1. A coated magnetic powder comprising a magnetic powder coated with an organosilicon polymer having a molecular weight of from 8,000 to 8,000. 2. A compound in which the main chain of the organosilicon polymer is made of a vinyl copolymer, and a silicon group bonded to a hydrolyzable group is added to the terminal and/or side chain of the molecule. Coated magnetic powder according to item 1. 3. A method for producing coated magnetic powder, characterized in that the surface is treated with an organosilicon polymer having magnetic powder molecules 1i500 to a,ooo. 4. Special FF, which is a compound in which the main chain of an organosilicon polymer is made of a vinyl copolymer and a silicon group bonded to a hydrolyzable group is added to the terminal and/or side chain of the molecule.
A method for producing a coated magnetic powder according to item 3.
JP57093672A 1982-06-01 1982-06-01 Coated magnetic powder and its manufacture Pending JPS58211322A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57093672A JPS58211322A (en) 1982-06-01 1982-06-01 Coated magnetic powder and its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57093672A JPS58211322A (en) 1982-06-01 1982-06-01 Coated magnetic powder and its manufacture

Publications (1)

Publication Number Publication Date
JPS58211322A true JPS58211322A (en) 1983-12-08

Family

ID=14088890

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57093672A Pending JPS58211322A (en) 1982-06-01 1982-06-01 Coated magnetic powder and its manufacture

Country Status (1)

Country Link
JP (1) JPS58211322A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140272119A1 (en) * 2013-03-14 2014-09-18 Sabic Innovative Plastics Ip B.V. Functionally graded polymer articles and methods of making same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140272119A1 (en) * 2013-03-14 2014-09-18 Sabic Innovative Plastics Ip B.V. Functionally graded polymer articles and methods of making same
US9731456B2 (en) * 2013-03-14 2017-08-15 Sabic Global Technologies B.V. Method of manufacturing a functionally graded article

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