JPS6183272A - Binder for magnetic recording material - Google Patents
Binder for magnetic recording materialInfo
- Publication number
- JPS6183272A JPS6183272A JP59205404A JP20540484A JPS6183272A JP S6183272 A JPS6183272 A JP S6183272A JP 59205404 A JP59205404 A JP 59205404A JP 20540484 A JP20540484 A JP 20540484A JP S6183272 A JPS6183272 A JP S6183272A
- Authority
- JP
- Japan
- Prior art keywords
- copolymer
- binder
- magnetic recording
- magnetic
- vinyl chloride
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Polyurethanes Or Polyureas (AREA)
- Paints Or Removers (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
(イ)産業上の利用分野
本発明は磁性粉の分散性にすぐれ、耐摩耗性及び耐熱性
にすぐれた磁性層が得られる磁気記録体用結着剤に関す
る。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a binder for magnetic recording materials that provides excellent dispersibility of magnetic powder and provides a magnetic layer with excellent wear resistance and heat resistance.
(ロ)従来の技術
磁気録画テープや磁気ディスク等に用いられる磁気記録
体は、通常、磁性粉末及びこの粉末をポリエステル等の
基体に結着する結着剤を含む磁性塗料を基体上に塗布、
配向、乾燥して得られ、優れた電気的特性及びaXヘッ
ドとの耐搦接性等の耐久性が要求される。従って磁気記
録体用結着剤には、磁性塗料における磁性粉末の分散性
に優れその結果磁気記録体に高い角形比を付与し得る特
性が特に強く要請され、更に耐摩耗性及び耐熱性に・優
れた磁性層を形成し得ること等が要請される。(B) Conventional technology Magnetic recording materials used in magnetic recording tapes, magnetic disks, etc. are usually made by coating a substrate with a magnetic paint containing magnetic powder and a binder that binds the powder to a substrate such as polyester.
It is obtained by orientation and drying, and is required to have excellent electrical properties and durability such as resistance to contact with the aX head. Therefore, binders for magnetic recording media are particularly required to have excellent dispersibility of magnetic powder in magnetic coatings, and as a result, to impart a high squareness ratio to magnetic recording media. It is required to be able to form an excellent magnetic layer.
これらの特性が比較的良好なものとして従来塩化ヒニル
ー酢酸ヒニルーピニルアルコール系ポリマー等が用いら
れ、磁性層の耐摩耗性を特に改善する必要のある場合は
前記ポリマーとイソシアネート化合物とを含有する磁気
記録体用結着剤が用いられていた。Conventionally, hinyl chloride-hinyl acetate-pinyl alcohol-based polymers have been used as having relatively good properties, and when it is necessary to particularly improve the wear resistance of the magnetic layer, magnetic materials containing the above polymers and isocyanate compounds have been used. A binder for recording bodies was used.
(ハ) 発明が解決しようとする問題点しかし最近は磁
気記録体の高密度化に伴って磁性粉が微粒子化の傾向に
あるところから、より一層分散性にすぐれた結着剤の開
発が要望されていた。(c) Problems to be solved by the invention However, as the density of magnetic recording media has increased recently, magnetic powder has tended to become finer particles, so there is a demand for the development of a binder with even better dispersibility. It had been.
本発明は上記磁気記録体用結着剤の現状に鑑み、磁性塗
料にした際の磁性粉末の分散性に優れ、又必要によりイ
ソシアネート化合物を加えることにより耐摩耗性及び耐
熱性に優れた磁性層を形成し得る磁気記録体用結着剤を
提供することを目的とするものである。In view of the current state of binders for magnetic recording media, the present invention provides a magnetic layer that has excellent dispersibility of magnetic powder when made into a magnetic coating material, and has excellent abrasion resistance and heat resistance by adding an isocyanate compound if necessary. An object of the present invention is to provide a binder for a magnetic recording body that can form a magnetic recording material.
に) 問題点を解決するための手段
本発明者′I!Iけ水酸基含有ビニル#4i量体と塩化
ビーニルとの共重合体からなる磁気記録体用結着剤につ
いて研究し、更にスルホ基含有単量体を共重合体の成分
として用いると、磁性粉末の分散性が大きく向上するこ
とを見い出して本発明を完成させたものである。) Means for solving the problem The inventor'I! We researched a binder for magnetic recording media made of a copolymer of vinyl hydroxyl group-containing vinyl #4i-mer and vinyl chloride, and found that when a sulfo group-containing monomer was used as a component of the copolymer, magnetic powder The present invention was completed by discovering that the dispersibility was greatly improved.
即ち本発明の要旨は、水酸基含有ビニル単量体とスルホ
基含有ビニル単量体とを構成単位として有する塩化ビニ
ル系共重合体を主要樹脂成分とし、必要に応じてイソシ
アネート化合物を含有することを特徴とする磁気記録体
用結着剤に存する。That is, the gist of the present invention is that the main resin component is a vinyl chloride copolymer having a hydroxyl group-containing vinyl monomer and a sulfo group-containing vinyl monomer as constituent units, and if necessary, an isocyanate compound is contained. The present invention is characterized by a binder for magnetic recording media.
本発明における塩化ビニル系共重合体中の塩化ビニルは
他の構成91位と共に磁性層に適度の硬さと可撓性を付
与するものであり、少な過ぎると磁気記録体の耐摩耗性
が不足し多過ぎると溶剤溶解性が低下する傾向があるの
で、上記共重合体中の含有量は、好ましくt/iao〜
95重量%とされる。Vinyl chloride in the vinyl chloride copolymer of the present invention, together with other constituents at position 91, imparts appropriate hardness and flexibility to the magnetic layer, and if too little, the abrasion resistance of the magnetic recording medium will be insufficient. If the amount is too large, the solvent solubility tends to decrease, so the content in the copolymer is preferably t/iao ~
It is assumed to be 95% by weight.
上記共重合体の構成単位として用いられる水酸基含有ビ
ニル単量体としては、アクリル酸又はメタクリル酸と多
価アルコールとの反応物としての構造式を有するものや
アクリル酸基もしくはメタクリル酸系アミド等が挙げら
れ、前者の具体例としては2−ヒドロキシエチル(メタ
)アクリレート(これは2−ヒドロキシエチルアクリレ
ートと2−ヒドロキシエチルメタクリレートの両方を表
わす。以下同じ)、2−ヒドロキシプロピル(メタ)ア
クリレート、3−クロロ−2−ヒドロキシプロピル(メ
タ)アクリレート、次式で表わされるポリエチレングリ
コールモノ(メタ)アクリレート
CM2= CR−COO+CHICH,0−3−nH(
nは2乃至9の整数、R#′i水素又はメチル基)、次
式で表わされるポリプロピレングリコールモノ(メタ)
アクリレート
6の整数、Rは水素又はメチル基)、2−ヒドロキシエ
チル−2′−アクリロイルオキシフタレート
等の(メタ)アクリル酸エステルを挙けることが出来、
後者の具体例としてはN−メチロール(メタ)アクリル
アミドを挙げることが出来る。Examples of the hydroxyl group-containing vinyl monomer used as a structural unit of the above copolymer include those having a structural formula as a reaction product of acrylic acid or methacrylic acid and a polyhydric alcohol, and acrylic acid group- or methacrylic acid-based amides. Specific examples of the former include 2-hydroxyethyl (meth)acrylate (this represents both 2-hydroxyethyl acrylate and 2-hydroxyethyl methacrylate; the same applies hereinafter), 2-hydroxypropyl (meth)acrylate, -Chloro-2-hydroxypropyl (meth)acrylate, polyethylene glycol mono(meth)acrylate CM2= CR-COO+CHICH, 0-3-nH(
n is an integer from 2 to 9, R#'i hydrogen or methyl group), polypropylene glycol mono(meth) represented by the following formula
acrylate (an integer of 6, R is hydrogen or a methyl group), (meth)acrylic esters such as 2-hydroxyethyl-2'-acryloyloxyphthalate,
A specific example of the latter is N-methylol (meth)acrylamide.
これらは単独でもしくは適宜組合せて共重合体の構成単
位として用いられ、特に2−ヒドロキシエチル(メタ)
アクリレート及び2−ヒドロキシプロピル(メタ)アク
リレート等が好適に用いられる。These are used alone or in appropriate combinations as constituent units of copolymers, especially 2-hydroxyethyl (meth)
Acrylate, 2-hydroxypropyl (meth)acrylate, and the like are preferably used.
これら水酸基を含むビニル単量体の使用量は、多過ぎる
と前記共重合体の溶剤溶解性の低下、磁気記録体の表面
平滑性の低下及び耐混性の低下等の不都合を生じ易く、
一方少な過ぎると磁性粉体の分散性が低下する傾向にあ
り、゛又必要により含有されるイソシアネート化合物と
の反応によるフレタン結合が充分に形成されないた6一
め、塗膜強度が弱くなったりブロッキングが生じ易くな
る傾向にあるので、上記共重合中に好ましくは1〜30
重量%、更に好ましくV12〜20重量%含有される。If the amount of these vinyl monomers containing hydroxyl groups is too large, disadvantages such as a decrease in solvent solubility of the copolymer, a decrease in surface smoothness of the magnetic recording medium, and a decrease in mixing resistance are likely to occur.
On the other hand, if the amount is too small, the dispersibility of the magnetic powder tends to decrease, and phletane bonds are not sufficiently formed due to the reaction with the isocyanate compound that is optionally contained.6 This may result in weakening of the coating film strength or blocking. During the above copolymerization, preferably 1 to 30
The content is preferably V12 to 20% by weight.
本発明におけるスルホ基含有ビニル単量体とは分子中に
スルホ基を有するビニル単量体のことで、具体的には2
−アクリルアミド−2−メチルプロパンスルホン酸、ア
クリルスルホン酸、メタリルスルホン酸、ビニルスルホ
ン酸、スチレンスルホン酸等が好適な例として挙げられ
、磁性粉末の分散性の点で特に2−アクリルアミF−2
−/fルプロノ曵ンスルホン酸が好ましい。The sulfo group-containing vinyl monomer in the present invention refers to a vinyl monomer having a sulfo group in the molecule, specifically 2
-Acrylamide-2-methylpropanesulfonic acid, acrylsulfonic acid, methallylsulfonic acid, vinylsulfonic acid, styrenesulfonic acid, etc. are mentioned as suitable examples, and 2-acrylamide F- 2
-/flupronosulfonic acid is preferred.
又、これらはスルホ基の水素がナトリウムやカリタム等
で置換されたものであってもよい。Moreover, these may have hydrogen in the sulfo group substituted with sodium, caritum, or the like.
スルホ基含有ビニル単量体は磁性粉末の分散性向上に大
きく寄与するものであるが、この量は、多過ぎると前記
共重合体の溶剤溶解性が低下して透明な溶液が得られな
かったり、耐水性が悪くなったり、必要により含有され
るイソシアネート化合物との架橋反応が早くなり過ぎて
磁性層、料のポットライフが短くなり、又少な過ぎると
磁性粉末の分散性が悪くなる傾向にあるので共重合体中
に好ましくはα05〜5重量%合有され、更に好ましく
けQl〜3重量%含有される。The sulfo group-containing vinyl monomer greatly contributes to improving the dispersibility of magnetic powder, but if the amount is too large, the solvent solubility of the copolymer may decrease and a transparent solution may not be obtained. If the amount is too low, the dispersibility of the magnetic powder tends to be poor. Therefore, α is preferably incorporated in the copolymer in an amount of 5 to 5% by weight, and more preferably Ql to 3% by weight.
本発明結着剤には、更に必要に応じてエチレン、プロピ
レン、酢酸ビニル等が塩化ビニル系共重合体の構成単位
として含有されていてもよく、又これらの単独重合体も
しくは共重合体が塩化ビニル系共重合体と共に用いられ
てもよい。The binder of the present invention may further contain ethylene, propylene, vinyl acetate, etc. as a constituent unit of the vinyl chloride copolymer, if necessary, and if these homopolymers or copolymers are chlorinated. It may also be used together with a vinyl copolymer.
特にエチレンを塩化ビニル系共重合体の構成単位として
用いるのが溶剤溶解性向上の点で好ましい。In particular, it is preferable to use ethylene as a constituent unit of the vinyl chloride copolymer from the viewpoint of improving solvent solubility.
上記塩化ビニル系共重合体は、例えば沈澱重合法、懸濁
重合法、乳化重合法等の公知の重合方法によって得るこ
とが出来る。沈澱重合法の場合はメタノールが好適な溶
剤として用いられ、共重合体は微細な粉末として得られ
る。共重合体重合度は、結着剤の機械的強度と磁性塗料
の特性の点から150〜600程度の範囲が好ましい。The above-mentioned vinyl chloride copolymer can be obtained by known polymerization methods such as precipitation polymerization, suspension polymerization, and emulsion polymerization. In the case of precipitation polymerization, methanol is used as a suitable solvent and the copolymer is obtained as a fine powder. The copolymerization degree is preferably in the range of about 150 to 600 from the viewpoint of the mechanical strength of the binder and the properties of the magnetic coating material.
即ち、平均重合度が150未満のものけこれを磁性塗料
として基体に塗布した場合塗膜面が弱い為実用性が低く
、筐た600を越えるものは塗料粘度が高くなり溶液を
塗布する際の作業性が悪いからである。In other words, if a magnetic paint with an average degree of polymerization of less than 150 is applied to a substrate as a magnetic paint, the coated film surface will be weak, making it less practical.If the average degree of polymerization exceeds 600, the viscosity of the paint will increase, making it difficult to apply the solution. This is because the workability is poor.
磁性層の耐摩耗性や耐熱性を特に高める場合に上記共重
合体と共に磁性粉末と混練されるイソシアネート化合物
としてハ、トリレンジイソシアネート、ジフェニルメタ
ンジイソシアネート、ジアニシジンジイソシアネート、
トリダンジイソシアネート、ヘキサメチレンジイソシア
ネート、メタキシリレンジイソシア*−)、7iびトリ
メチロールプロパン1モルとトリレンジイソシアネート
3モルとの反応物等が挙げられ、該反応物は、例えば日
本ポリクレタンエgI!−から商品名[コロネー)LJ
として市販されている。Isocyanate compounds to be kneaded with the magnetic powder together with the above copolymer when particularly enhancing the abrasion resistance and heat resistance of the magnetic layer include (c) tolylene diisocyanate, diphenylmethane diisocyanate, dianisidine diisocyanate,
Examples include toridane diisocyanate, hexamethylene diisocyanate, metaxylylene diisocyanate *-), 7i, and a reaction product of 1 mol of trimethylolpropane and 3 mol of tolylene diisocyanate. -Product name [Coronet] LJ
It is commercially available as.
イソシアネート化合物の使用量は、多過ぎると架橋密度
が高くなって最終的に得られる塗膜が硬く脆くなり、又
少なすぎると所期の効果が得られないので、上記共重合
体100重ffi部に対し通常t−j(13〜30重社
部とされる。If the amount of the isocyanate compound used is too large, the crosslinking density will be high and the final coating film will be hard and brittle, and if it is too small, the desired effect will not be obtained. In contrast, it is usually t-j (13 to 30 jushabu).
本発明結着剤によ#)磁性塗料を作成するには、例えば
、トルエン等の酸剤に溶解された上記共重合体にCo−
γ−酢化鉄のような磁性粉末材料を界面活性剤等の添加
剤と共に添加、混練して分散させ、磁性層の耐犀耗性を
特に高める場合等必要に応じてイソシアネート化合物を
混入し、磁性塗料を得るのである。To prepare a magnetic paint using the binder of the present invention, for example, Co-
A magnetic powder material such as γ-iron acetate is added together with additives such as a surfactant, kneaded and dispersed, and an isocyanate compound is mixed in as necessary, such as when particularly increasing the corrosion resistance of the magnetic layer. This is how we obtain magnetic paint.
但し本発明における上記共重合体、イソシアネート化合
物及び磁性材料粉末の添加順序、分散手段等は何ら限定
されない。尚、上記共重合体を溶解して本発明結着剤と
する際に用いる溶剤としてハ、トルエン、メチルエチル
ケトン、メチルイソブチルケトン、シクロヘキサノン等
の一種又は二種以上の混合物が一般に用いられる。上記
共重合体は、磁性材料粉末100菖艦部について通常、
lO〜100ffi量部用いられ、また、磁性塗料は、
通常、5〜3o重j196の上記共重合体を有するよう
に調製される。However, the order of addition, dispersion means, etc. of the copolymer, isocyanate compound, and magnetic material powder in the present invention are not limited at all. Incidentally, as a solvent used when dissolving the above copolymer to prepare the binder of the present invention, one or a mixture of two or more of the following is generally used: toluene, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and the like. Regarding the magnetic material powder 100, the above copolymer usually has the following properties:
lO~100ffi parts are used, and the magnetic paint is
Usually, it is prepared to have 5 to 3 o polymers of 196 of the above copolymer.
=10−
(ホ) 発明の効果
本発明磁気記録体用結着剤は上述の通りの構成になされ
ており、特に主要樹脂成分である塩化ビニル系共重合体
中に水酸基含有ビニル単量体及びスルホ基含有ビニル単
量体が構成単位として含有されているので、得られる磁
性塗料は磁性粉末の分散性に優れ従って角形比の高い磁
性層が形成され、又、共重合体中には塩化ビニルが含有
されているので、他の成分と相俟って、適度の硬さと可
撓性を有する磁性層が形成されるのである。=10- (E) Effects of the Invention The binder for a magnetic recording medium of the present invention has the above-mentioned structure, and in particular contains a hydroxyl group-containing vinyl monomer and a vinyl chloride copolymer as the main resin component. Since the sulfo group-containing vinyl monomer is contained as a structural unit, the resulting magnetic paint has excellent dispersibility of magnetic powder, and a magnetic layer with a high squareness ratio is formed. Since it contains, in combination with other components, a magnetic layer having appropriate hardness and flexibility is formed.
更に本発明結着剤がイソシアネート化合物を含有するも
のである場合は、共重合体中に導入された水酸基が共重
合体とイソシアネート化合物との架橋反応に寄与して耐
摩耗性及び耐熱性に優れた磁性層を形成する。Furthermore, when the binder of the present invention contains an isocyanate compound, the hydroxyl groups introduced into the copolymer contribute to the crosslinking reaction between the copolymer and the isocyanate compound, resulting in excellent wear resistance and heat resistance. forming a magnetic layer.
(へ)実施例
以下に実施例を挙げて零発8Aを説明する。尚、以下に
おいて「部」及び「%」はそれぞれ重量部及び重量%を
示す。(F) Example The zero-shot 8A will be explained below with reference to an example. In the following, "parts" and "%" indicate parts by weight and % by weight, respectively.
又各物件の測定は次の方法によった。In addition, measurements of each property were conducted using the following method.
角形比
必要によりイソシアネート化合物が添加された磁性塗料
全2.5μ厚のポリエステルフィルム上に乾燥厚が6μ
となる様に塗布、配向、乾燥して磁気記録体を作製し、
角形比を測定した。Squareness ratio: Magnetic coating with isocyanate compound added as required. Dry thickness is 6μ on a total 2.5μ thick polyester film.
A magnetic recording medium is prepared by coating, orienting, and drying so that
Squareness ratio was measured.
加熱密着性
磁気記録体を120℃の温度で15分間加熱し、磁性層
を相互に重ねたときに接着するが否かをみたものであり
、表において○け接着しない(ブロッキングが起こらな
い)ことを、筐た、×は接着することを示す。Heat-adhesive magnetic recording material is heated at a temperature of 120°C for 15 minutes to see if it adheres when the magnetic layers are stacked on top of each other. No adhesion (no blocking occurs) on the front side. , casing, x indicates to be glued.
ゲル分率
磁性粉を含有しない塩化ビニル系共重合体製フィルムを
50℃のトルエン−メチルイソブチルケトン(重量比1
:l)混合溶媒に一昼夜浸漬した後のフィルムの重量を
浸漬前のフィルムの重量で除した値(重量%)であり、
共重合体とイソシアネート化合物との架橋反応の反応効
率等を判断する目安となるものである。Gel fraction A vinyl chloride copolymer film containing no magnetic powder was heated to toluene-methyl isobutyl ketone (weight ratio 1) at 50°C.
:l) It is the value (wt%) obtained by dividing the weight of the film after being immersed in a mixed solvent for one day and night by the weight of the film before immersion,
This serves as a guideline for determining the reaction efficiency of the crosslinking reaction between the copolymer and the isocyanate compound.
実施例1
初期仕込
撹拌機を備えた内容積201!のステンレスオートクレ
ーブにメタノール(試薬−級)8000yと重合開始剤
としてα−クミルパーオキシネオデカノエート20f5
f仕込んだ後、アスピレータで5分間排気して、残存す
る空気を排除した。Example 1 Internal volume 201 with initial charge agitator! 8000y of methanol (reagent grade) and 20f5 of α-cumyl peroxyneodecanoate as a polymerization initiator were placed in a stainless steel autoclave.
After charging, it was evacuated using an aspirator for 5 minutes to remove remaining air.
次に塩化ビニル2600pを仕込んだ。Next, 2600 p of vinyl chloride was charged.
後添加仕込
3gの吊り下げ可能なステンレス製容器(添加容器と言
う)の空気を排除したのち、2−ヒドロキシプロピルア
クリレート259f、2−アクリルアミド−2−メチル
プロノ鴫ンスルホン酸(日東化学社製、AMPS)15
F、メタノール5002を吸引させ、その後塩化ビニル
1.045 fを圧入した。After removing the air from a stainless steel container (referred to as addition container) containing 3 g of post-addition preparation, 2-hydroxypropyl acrylate 259f, 2-acrylamide-2-methylpronosulfonic acid (manufactured by Nitto Kagaku Co., Ltd., AMPS) was added. 15
5,002 F of methanol was suctioned, and then 1.045 F of vinyl chloride was injected under pressure.
この容器を振とうして内容物を混合溶解した後にバネ秤
りに吊し、底部の弁よりフレキシブルチューブを使用し
て重合反応器の添加=13−
ノズルに接続した。After shaking the container to mix and dissolve the contents, it was hung on a spring balance, and connected to the nozzle of the polymerization reactor using a flexible tube from the valve at the bottom.
重合反応操作
重合反応器の撹拌機の回転数を38 Orpmとし、ジ
ャケットに温水を通して内温を43℃に昇温した。Polymerization reaction operation The rotational speed of the stirrer of the polymerization reactor was set to 38 Orpm, and warm water was passed through the jacket to raise the internal temperature to 43°C.
内温が43℃になると重合反応が開始したので、以後は
、内温が43℃になるよう温度調節を行なった。Since the polymerization reaction started when the internal temperature reached 43°C, the temperature was thereafter adjusted to keep the internal temperature at 43°C.
一方、43℃になった時添加容器から単量体の混合溶液
をsap添加し、その後重合反応の進行に応じて、5分
毎に46 yX4回、10分毎に31pX8回、5分価
に27f×49回に分割して添加した。On the other hand, when the temperature reached 43°C, add the monomer mixed solution sap from the addition container, and then, depending on the progress of the polymerization reaction, add 46 y x 4 times every 5 minutes, 31 p x 8 times every 10 minutes, and increase the concentration to 5 min. It was added in 27f×49 portions.
最後の添加を終って10分後25℃迄冷却して重合反応
を停止した。重合反応器の内圧は反応開始時にl OK
? / x”G、反応終了時にはL8々/cJiGであ
った。Ten minutes after the last addition was completed, the polymerization reaction was stopped by cooling to 25°C. The internal pressure of the polymerization reactor is l OK at the start of the reaction.
? / x”G, and at the end of the reaction it was L8/cJiG.
冷却後未反応の塩化ビニルを排ガスした後、さらに窒素
ガスを通して十分に塩化ビニルを除去し、次いで重合反
応器より共重合体のメタノールスラリーを抜出し、ろ過
した後、50℃で24時間真空乾I#!を行なって白色
の粉粒状の共重合体Aを1370y得た。After cooling, unreacted vinyl chloride was vented, nitrogen gas was passed through to thoroughly remove the vinyl chloride, and the methanol slurry of the copolymer was extracted from the polymerization reactor, filtered, and vacuum dried at 50°C for 24 hours. #! 1370y of white powdery copolymer A was obtained.
該樹脂の重合度は350、組成は塩化ビニル87.1%
、2−ヒドロキシプロピルアクリレート】2.0%、2
−アクリルアミド−2−メチルプロパンスルホン酸a9
%であった。The degree of polymerization of this resin is 350, and the composition is 87.1% vinyl chloride.
, 2-hydroxypropyl acrylate] 2.0%, 2
-acrylamido-2-methylpropanesulfonic acid a9
%Met.
共重合体Aをトルエン−メチルイソブチルケトン(重量
比1:l)混合液に溶解して15%の共重合体溶液を調
製し、次にこの溶液に共r体の24倍量(重量)のCo
−7−酸化鉄を加え、ペイントコンディシコナー(レ
ッドデビル社製)にて6時同混合分散させて磁性塗料と
した後、磁気記録体を作成し角形比を測定したところα
84という高い値が得られた。A 15% copolymer solution was prepared by dissolving copolymer A in a toluene-methyl isobutyl ketone (weight ratio 1:l) mixture, and then 24 times the amount (by weight) of the copolymer was added to this solution. Co
-7- After adding iron oxide and simultaneously mixing and dispersing it in a paint conditioner (manufactured by Red Devil) to make a magnetic paint, a magnetic recording medium was prepared and the squareness ratio was measured.
A high value of 84 was obtained.
実施例2
実施例1で用いたものと同じ装置、同じ単量体を用いて
実施例1に準じて重合を行った。但し夫々の単量体の仕
込量は梢変化させて重合を行った。Example 2 Polymerization was carried out according to Example 1 using the same equipment and the same monomers as those used in Example 1. However, polymerization was carried out while varying the amount of each monomer charged.
最初に粉末の共重合体Bを得て、該共重合体の組成を分
析し、更に実施例1と同様にして、磁気記録体を調整し
て角形比を測定したところ、その結!J!i;を第1表
の通りであった。First, a powdered copolymer B was obtained, the composition of the copolymer was analyzed, and a magnetic recording medium was prepared in the same manner as in Example 1 and the squareness ratio was measured. J! i; was as shown in Table 1.
又共重合体Bと同様にして、第1表に示される組成の共
重合体C,D、E及びFを得、磁気記録体を調整したと
ころ、夫々の角形比は第1表の通り何れもαδを越える
高い値であった。In addition, in the same manner as copolymer B, copolymers C, D, E, and F having the compositions shown in Table 1 were obtained, and magnetic recording bodies were prepared. was also a high value exceeding αδ.
比較例1
実施例1の樹脂Aと同様にして製造された塩化ビニル/
2−ヒドロキシプロピルアクリレートの共重合体(重合
度280.2−HPA 19.0重量%含有)aX及
び垣化ビニル/酢酸ビニル/ビニルアルコール共重合体
(組成比この順に91/3/6 )bについて、実施例
1と同様な方法に従って磁気記録体を作成し角形比を測
定したところ夫々α78と0.76であった。Comparative Example 1 Vinyl chloride produced in the same manner as Resin A of Example 1/
Copolymer of 2-hydroxypropyl acrylate (degree of polymerization: 280.2 - containing 19.0% by weight of HPA) aX and vinyl/vinyl acetate/vinyl alcohol copolymer (composition ratio in this order: 91/3/6) b A magnetic recording medium was prepared according to the same method as in Example 1, and the squareness ratio was measured to be α78 and 0.76, respectively.
実施例3
実施例1で得られた共重合体A及び実施例2で得られた
共重合体B−Fを夫々トルエン−メチルイソブチルケト
ン(重量比l:1)混合液に溶解して15%の溶液に調
整した。Example 3 Copolymer A obtained in Example 1 and copolymer B-F obtained in Example 2 were each dissolved in a toluene-methyl isobutyl ketone (weight ratio 1:1) mixture to give a concentration of 15%. The solution was adjusted to
この溶液に共重合体の2.4倍量(重量)のC〇−T−
酸化鉄を加えボールミルにて20時間混合分散させたの
ち、イソシアネート化合物(日本ポリフレタン工業社製
、コロネートL)をQ65部加えて撹拌して磁性塗料と
し、この塗料をポリエステルフィルム上に塗布、配向、
乾燥して架橋反応を充分進めた磁気記録体を得た。Add to this solution 2.4 times the amount (weight) of the copolymer C〇-T-
After adding iron oxide and mixing and dispersing it in a ball mill for 20 hours, Q65 parts of an isocyanate compound (Coronate L, manufactured by Nippon Polyurethane Industries Co., Ltd.) was added and stirred to make a magnetic paint, and this paint was applied onto a polyester film, oriented and
After drying, a magnetic recording material in which the crosslinking reaction had sufficiently progressed was obtained.
この磁気記録体の角形比と加熱密着性F′i@2表の通
りであった。又、夫々の共重合体とイソシアネートとの
架橋反応性を示すゲル分wIは第2表の通りであった。The squareness ratio and heat adhesion of this magnetic recording body were as shown in Table 2. Further, the gel content wI, which indicates the crosslinking reactivity between each copolymer and isocyanate, was as shown in Table 2.
比較例2
比較例1で用いた共重合体a及びbについて、夫々実施
例2と同様にして磁気記録体を作成し、加熱密着性を測
定したところ、両者共にブロッキングが生じた。Comparative Example 2 Magnetic recording bodies were prepared using copolymers a and b used in Comparative Example 1 in the same manner as in Example 2, and their heat adhesion was measured. Blocking occurred in both.
比較例3
実施例2と同様にして第3表に示す組成の共重合体c、
d、eを得、実施例3と同様にして磁性塗料及び磁気記
鐙体を作威し角形比、加熱密着性を測定1.7た。又犬
々の共重合体とイソシアネートとの架橋反応性を示すゲ
ル分率を測定した。これらの結果に第3表の通りであっ
た。Comparative Example 3 Copolymer c having the composition shown in Table 3 in the same manner as Example 2,
d and e were obtained, a magnetic paint and a magnetic stirrup body were prepared in the same manner as in Example 3, and the squareness ratio and heat adhesion were measured to be 1.7. In addition, the gel fraction, which indicates the crosslinking reactivity between the copolymer and isocyanate, was measured. These results are shown in Table 3.
Claims (1)
体とを構成単位として有する塩化ビニル系共重合体を主
要樹脂成分とし、必要に応じてイソシアネート化合物を
含有することを特徴とする磁気記録体用結着剤。 2、塩化ビニル系共重合体中の水酸基含有ビニル単量体
の含有量が1〜30重量%である第1項記載の磁気記録
体用結着剤。 3、塩化ビニル系共重合体中のスルホ基含有ビニル単量
体の含有量が0.05〜5重量%である第1項又は第2
項記載の磁気記録体用結着剤。 4、塩化ビニル系共重合体の平均重合度が150〜60
0である第1項〜第3項何れか1項に記載の磁気記録体
用結着剤。 5、塩化ビニル系共重合体における塩化ビニルの含有量
が60〜95重量%、水酸基含有ビニル単量体の含有量
が1〜30重量%、スルホ基含有ビニル単量体の含有量
が0.05〜5重量%である第1項又は第4項記載の磁
気記録体用結着剤。 6、スルホ基含有ビニル単量体が2−アクリルアミド−
2−メチルプロパンスルホン酸である第1項〜第5項何
れか1項に記載の磁気記録体用結着剤。[Claims] 1. The main resin component is a vinyl chloride copolymer having a hydroxyl group-containing vinyl monomer and a sulfo group-containing vinyl monomer as constituent units, and an isocyanate compound is contained as necessary. A binder for magnetic recording media characterized by: 2. The binder for a magnetic recording medium according to item 1, wherein the content of the hydroxyl group-containing vinyl monomer in the vinyl chloride copolymer is 1 to 30% by weight. 3. Item 1 or 2, wherein the content of the sulfo group-containing vinyl monomer in the vinyl chloride copolymer is 0.05 to 5% by weight.
A binder for a magnetic recording medium as described in 1. 4. The average degree of polymerization of the vinyl chloride copolymer is 150 to 60
0. The binder for a magnetic recording medium according to any one of the first to third items. 5. The content of vinyl chloride in the vinyl chloride copolymer is 60 to 95% by weight, the content of hydroxyl group-containing vinyl monomer is 1 to 30% by weight, and the content of sulfo group-containing vinyl monomer is 0. 5. The binder for a magnetic recording medium according to claim 1 or 4, wherein the binder is 05 to 5% by weight. 6. Sulfo group-containing vinyl monomer is 2-acrylamide-
The binder for a magnetic recording medium according to any one of items 1 to 5, which is 2-methylpropanesulfonic acid.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59205404A JPS6183272A (en) | 1984-09-29 | 1984-09-29 | Binder for magnetic recording material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59205404A JPS6183272A (en) | 1984-09-29 | 1984-09-29 | Binder for magnetic recording material |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6183272A true JPS6183272A (en) | 1986-04-26 |
JPH0417209B2 JPH0417209B2 (en) | 1992-03-25 |
Family
ID=16506273
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP59205404A Granted JPS6183272A (en) | 1984-09-29 | 1984-09-29 | Binder for magnetic recording material |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6183272A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6096633A (en) * | 1983-10-31 | 1985-05-30 | Fuji Photo Film Co Ltd | Curable sulfonic acid resin composition and particle |
JPS60235814A (en) * | 1984-05-08 | 1985-11-22 | Nippon Zeon Co Ltd | Resin for magnetic paint |
-
1984
- 1984-09-29 JP JP59205404A patent/JPS6183272A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6096633A (en) * | 1983-10-31 | 1985-05-30 | Fuji Photo Film Co Ltd | Curable sulfonic acid resin composition and particle |
JPS60235814A (en) * | 1984-05-08 | 1985-11-22 | Nippon Zeon Co Ltd | Resin for magnetic paint |
Also Published As
Publication number | Publication date |
---|---|
JPH0417209B2 (en) | 1992-03-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS63129519A (en) | Magnetic recording medium and its production | |
JPH0440779B2 (en) | ||
JPS6183272A (en) | Binder for magnetic recording material | |
JPS634417A (en) | Magnetic medium composition | |
JPH01158619A (en) | Binder for magnetic recording medium | |
JP2779301B2 (en) | Improved polishing aid formulation | |
JPS6273417A (en) | Binder for magnetic recording body | |
JPS6083219A (en) | Binder for magnetic recording body | |
JPS61243934A (en) | Binder for magnetic recording medium | |
JPS6273416A (en) | Binder for magnetic recording body | |
JPH03152168A (en) | Water-based resin dispersion liquid | |
JPH0721849B2 (en) | Binder for magnetic recording media | |
JP2991570B2 (en) | Magnetic recording media | |
JPS6121497B2 (en) | ||
JP2799205B2 (en) | Magnetic recording media | |
JPH0658737B2 (en) | Magnetic recording medium | |
JPS6080119A (en) | Magnetic recording medium | |
JPH03185041A (en) | Binder for magnetic recording material | |
JPS62257619A (en) | Magnetic recording medium | |
JPS6022414B2 (en) | magnetic recording medium | |
JP2545054B2 (en) | Method of manufacturing magnetic recording medium | |
JPH0363129B2 (en) | ||
JP3502159B2 (en) | Silica particle composite aqueous resin composition and method for producing the same | |
JPH03141019A (en) | Magnetic recording medium | |
JPH01221464A (en) | Slipperiness improver |