JPH0544164B2 - - Google Patents
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- Publication number
- JPH0544164B2 JPH0544164B2 JP58247521A JP24752183A JPH0544164B2 JP H0544164 B2 JPH0544164 B2 JP H0544164B2 JP 58247521 A JP58247521 A JP 58247521A JP 24752183 A JP24752183 A JP 24752183A JP H0544164 B2 JPH0544164 B2 JP H0544164B2
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- magnetic
- acetic acid
- iron oxide
- particles
- oxide particles
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Description
【発明の詳細な説明】
本発明は、磁気記録用磁性酸化鉄粒子粉末の処
理法に関するものであり、詳しくは、オーデイ
オ、ビデオ等の高記録密度用磁性粒子粉末として
最適であるかさ密度が大きく、且つ、ぬれ特性の
優れた磁性酸化鉄粒子粉末を得ることを目的とす
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for processing magnetic iron oxide particles for magnetic recording, and more specifically, the present invention relates to a method for processing magnetic iron oxide particles for magnetic recording. The object of the present invention is to obtain magnetic iron oxide particles having excellent wetting properties.
磁気記録媒体の製造に際して、本発明により得
られる磁性酸化鉄粒子粉末を用いた場合には、か
さ密度が大きく、且つぬれ特性が優れていること
に起因して、磁性酸化鉄粒子のビヒクル中での分
散性、塗膜中での配向性及び充填性が極めて優
れ、好ましい磁気記録媒体を得ることができる。 When the magnetic iron oxide particles obtained according to the present invention are used in the production of magnetic recording media, due to their large bulk density and excellent wetting properties, it is possible to It is possible to obtain a preferable magnetic recording medium with extremely excellent dispersibility, orientation in a coating film, and filling property.
ここで、ぬれ特性とは磁性酸化鉄粒子の粒子表
面に吸着されている空気や水等が次々とぬらすべ
きビヒクルと置換されていくことを意味してお
り、ぬれ特性の改良された磁性酸化鉄粒子粉末は
分散性が良好であり、その結果、塗膜中での配向
性、充填性は極めて優れたものとなることが知ら
れている。 Here, the wetting property means that air, water, etc. adsorbed on the particle surface of the magnetic iron oxide particles are successively replaced with the vehicle to be wetted, and the magnetic iron oxide particles with improved wetting properties are It is known that the particle powder has good dispersibility, and as a result, the orientation and filling properties in the coating film are extremely excellent.
近年、オーデイオ、ビデオ等の磁気記録再生用
機器の長時間記録化、小型軽量化が進むにつれ
て、磁気テープ、磁気デイスク等の磁気記録媒体
に対する高性能化、高密度記録化の要求が益々高
まつてきている。 In recent years, as magnetic recording and reproducing devices such as audio and video have become longer recording times, smaller and lighter, demands for higher performance and higher density recording have been increasing for magnetic recording media such as magnetic tapes and magnetic disks. It's coming.
磁気記録媒体の高性能化、高密度記録化の為に
は、分散性、充填性、残留磁束密度Brの向上が
必要である。 In order to achieve high performance and high density recording of magnetic recording media, it is necessary to improve dispersibility, filling properties, and residual magnetic flux density Br.
磁気記録媒体のこれら諸特性は、磁気記録媒体
に使用される磁性粒子粉末と密接な関係を持つて
おり、磁性粒子粉末の特性改善が強く望まれてい
る。 These properties of magnetic recording media are closely related to the magnetic particles used in magnetic recording media, and there is a strong desire to improve the properties of magnetic particles.
今、磁気記録媒体の諸特性と使用される磁性粒
子粉末の特性との関係について詳述すれば次の通
りである。 The relationship between the various characteristics of the magnetic recording medium and the characteristics of the magnetic particles used will now be detailed as follows.
先ず、磁気記録媒体の残留磁束密度Brは、磁
性粒子粉末のビヒクル中での分散性、塗膜中での
配向性及び充填性に依存している。 First, the residual magnetic flux density Br of a magnetic recording medium depends on the dispersibility of the magnetic particles in the vehicle, the orientation and filling properties in the coating film.
そして、ビヒクル中での分散性、塗膜中での配
向性及び充填性を向上させるためには、ビヒクル
中に分散させる磁性粒子粉末のかさ密度が大き
く、且つ、ぬれ特性が優れていることが要求され
る。 In order to improve the dispersibility in the vehicle, the orientation and filling properties in the coating film, it is necessary that the bulk density of the magnetic particles dispersed in the vehicle is high and that the wetting properties are excellent. required.
現在、磁気記録用磁性粒子粉末として主にマグ
ネタイト粒子粉末又はマグヘマイト粒子粉末が用
いられている。 Currently, magnetite particles or maghemite particles are mainly used as magnetic particles for magnetic recording.
これらは、一般に第一鉄塩水溶液とアルカリと
の反応水溶液を空気酸化し（通常、「湿式反応」
と呼ばれている。）て得られるゲータイト粒子を、
水素等還元性ガス中300〜400℃で還元することに
よりマグネタイト粒子を生成し、または、次いで
これを空気中200〜300℃で酸化してマグヘマイト
粒子を生成することにより得られており、該生成
マグネタイト粒子又は該生成マグヘマイト粒子を
粉砕することにより製品としている。 These reactions generally involve air oxidation of a reaction solution of a ferrous salt aqueous solution with an alkali (usually a "wet reaction").
It is called. ) The goethite particles obtained by
It is obtained by reducing magnetite particles at 300 to 400°C in a reducing gas such as hydrogen, or by oxidizing this in air at 200 to 300°C to produce maghemite particles. The product is produced by crushing the magnetite particles or the produced maghemite particles.
上記方法により得られたマグネタイト粒子粉末
及びマグヘマイト粒子粉末は、還元、酸化等の熱
処理工程を経る為、粒子及び粒子相互間で焼結が
生起して凝集粒子が混在したものとなる。 Since the magnetite particles and maghemite particles obtained by the above method undergo heat treatment steps such as reduction and oxidation, sintering occurs between the particles and between the particles, resulting in a mixture of aggregated particles.
このようなマグネタイト粒子粉末及びマグヘマ
イト粒子粉末は、かさ密度が小さく、また、ぬれ
特性が悪いものである。 Such magnetite particles and maghemite particles have a small bulk density and poor wetting properties.
本発明者は、上述したところに鑑み、かさ密度
が大きく、且つ、ぬれ特性の優れた磁性酸化鉄粒
子を得るべく、磁性酸化鉄粒子の粒子表面を改質
する方法について種々検討した結果、本発明に到
達したのである。 In view of the above, the present inventor has conducted various studies on methods of modifying the particle surface of magnetic iron oxide particles in order to obtain magnetic iron oxide particles that have a large bulk density and excellent wetting properties, and have developed the present invention. The invention was achieved.
即ち、本発明は、磁性酸化鉄粒子粉末に、Fe2
O3に対し0.1〜2.0重量％の酢酸を添加して粒子表
面を酢酸で処理して前記磁性酸化前記磁性酸化鉄
粒子粉末の粒子表面に酢酸を付着させることによ
つてかさ密度を大きくすることよりなる磁気記録
用磁性酸化鉄粒子粉末の処理法である。 That is, the present invention adds Fe 2 to magnetic iron oxide particles.
increasing the bulk density by adding 0.1 to 2.0% by weight of acetic acid to O 3 and treating the particle surface with acetic acid to attach acetic acid to the particle surface of the magnetic iron oxide particle powder; This is a method for processing magnetic iron oxide particles for magnetic recording.
次に本発明の構成について述べる。 Next, the configuration of the present invention will be described.
本発明者は、かさ密度が大きく、且つ、ぬれ特
性の優れた磁性酸化鉄粒子を得るべく、磁性酸化
鉄粒子の粒子表面を改質する方法について種々検
討した結果、磁性酸化鉄粒子に、Fe2O3に対し0.1
〜2.0重量％の酢酸を添加して粒子表面を酢酸で
処理することにより、上記磁性酸化鉄粒子の粒子
表面に酢酸を付着させた場合には、かさ密度が大
きく、且つ、ぬれ特性の優れた磁性酸化鉄粒子を
得ることができるという知見を得た。 In order to obtain magnetic iron oxide particles with high bulk density and excellent wetting properties, the inventors of the present invention have investigated various methods for modifying the particle surface of magnetic iron oxide particles. 0.1 for 2 O 3
When acetic acid is attached to the particle surface of the magnetic iron oxide particles by adding ~2.0% by weight of acetic acid and treating the particle surface with acetic acid, the particles have a large bulk density and excellent wetting properties. We have found that magnetic iron oxide particles can be obtained.
この現象について、本発明者は、磁性酸化鉄粒
子の粒子表面に特定量の酢酸を付着させることに
より該磁性酸化鉄粒子の粒子表面が疎水化された
ためであると考えている。 The present inventor believes that this phenomenon is because the surface of the magnetic iron oxide particles is made hydrophobic by attaching a specific amount of acetic acid to the surface of the magnetic iron oxide particles.
今、本発明者が行つた数多くの実験例から、そ
の一部を抽出して説明すれば次の通りである。 The following is an explanation of some of the many experimental examples conducted by the present inventor.
図１は、生成磁性酸化鉄粒子粉末の粉砕時に添
加した酢酸の添加量と酢酸が付着している磁性酸
化鉄粒子粉末のかさ密度との関係を示したもので
ある。 FIG. 1 shows the relationship between the amount of acetic acid added during pulverization of the generated magnetic iron oxide particles and the bulk density of the magnetic iron oxide particles to which acetic acid is attached.
図１から明らかな通り、酢酸の添加量の増加に
伴つて磁性酸化鉄粒子粉末のかさ密度は大きくな
る傾向にある。 As is clear from FIG. 1, the bulk density of the magnetic iron oxide particles tends to increase as the amount of acetic acid added increases.
本発明における磁性酸化鉄粒子は、マグネタイ
ト粒子、マグヘマイト粒子、ベルトライド型酸化
鉄粒子又はこれらにCo等のFe以外の異種金属を
含有させ、若しくは被着させた粒子を使用するこ
とができる。 As the magnetic iron oxide particles in the present invention, magnetite particles, maghemite particles, bertholed iron oxide particles, or particles in which a different metal other than Fe, such as Co, is contained or coated can be used.
本発明における磁性酸化鉄粒子の酢酸による処
理は、磁性酸化鉄粒子の粒子表面を改質する方法
に関するものであり、従つて最終製品である磁性
酸化鉄粒子の粒子表面に酢酸が付着していること
が肝要である。従つて、磁性酸化鉄粒子の粒子表
面に酢酸を完全に付着させる為には粉砕工程にお
いて酢酸処理を行うことが好ましく、殊に、圧密
粉砕機を採用して酢酸処理をした場合には最も顕
著な効果が得られる。 The treatment of magnetic iron oxide particles with acetic acid in the present invention relates to a method for modifying the particle surface of magnetic iron oxide particles, and therefore acetic acid is attached to the particle surface of the magnetic iron oxide particles that are the final product. That is essential. Therefore, in order to completely adhere acetic acid to the particle surface of magnetic iron oxide particles, it is preferable to perform acetic acid treatment during the crushing process, and this is most noticeable especially when acetic acid treatment is performed using a compaction crusher. You can get the following effect.
圧密粉砕機を採用して酢酸処理をした場合、最
も顕著な効果が得られる理由は未だ明らかではな
いが、本発明者は、酢酸が粉砕助剤的な作用をす
る結果、個々の磁性酸化鉄粒子の粒子表面に酢酸
が均一に付着するためではないかと考えている。 Although it is not yet clear why the most remarkable effect is obtained when acetic acid treatment is carried out using a compaction mill, the present inventor has discovered that as a result of acetic acid acting as a grinding aid, individual magnetic iron oxide particles are We believe that this is because acetic acid adheres uniformly to the surface of the particles.
粉砕工程においては、ホイール型、ボール型、
ロツド型、ブレード型の粉砕機や擂潰機を使用す
ることができる。 In the crushing process, wheel type, ball type,
A rod-type or blade-type crusher or crusher can be used.
圧密粉砕機能を有する粉砕機としては、ロツド
ミル、ボールミル、エツジランナー、リングロー
ラミルなどを使用することができる。 As a crusher having a compaction crushing function, a rod mill, a ball mill, an edge runner, a ring roller mill, etc. can be used.
本発明における酢酸による処理は、磁性酸化鉄
粒子に酢酸を添加若しくは噴霧するか、又は、磁
性酸化鉄粒子を酢酸に浸漬することによつて行
う。 The treatment with acetic acid in the present invention is carried out by adding or spraying acetic acid to the magnetic iron oxide particles, or by immersing the magnetic iron oxide particles in acetic acid.
本発明における磁性酸化鉄粒子への酢酸の添加
量は0.1〜2.0重量％である。 The amount of acetic acid added to the magnetic iron oxide particles in the present invention is 0.1 to 2.0% by weight.
0.1重量％以下である場合には、本発明の目的
とする効果を達成することができない。 If it is less than 0.1% by weight, the desired effects of the present invention cannot be achieved.
2.0重量％以上である場合にも本発明の効果を
得ることができるが、必要以上に添加する意味が
なく、また、磁気塗料の製造にあたり汎用される
ウレタン系熱硬化型磁性塗料の貯蔵安定性の低下
を招来し、更に、磁性塗膜の硬度、耐摩耗性など
の塗膜物性の劣化が生じやすくなる。 Although the effects of the present invention can be obtained even if the amount is 2.0% by weight or more, there is no point in adding more than necessary, and the storage stability of urethane-based thermosetting magnetic paints, which are commonly used in the production of magnetic paints, may be affected. In addition, physical properties of the magnetic coating, such as hardness and abrasion resistance, tend to deteriorate.
磁性酸化鉄粒子の表面改質、磁性塗料の作業性
及び塗膜物性を考慮した場合、0.2〜0.7重量％が
好ましい。 When considering the surface modification of magnetic iron oxide particles, the workability of the magnetic paint, and the physical properties of the coating film, the amount is preferably 0.2 to 0.7% by weight.
以上の通りの構成の本発明は、次の通りの効果
を奏するものである。 The present invention configured as described above has the following effects.
即ち、本発明によれば、かさ密度が大きく、且
つ、ぬれ特性の優れた磁性酸化鉄粒子粉末を得る
ことができるので、現在、最も要求されている高
記録密度用磁性材料として好適である。 That is, according to the present invention, it is possible to obtain magnetic iron oxide particles having a large bulk density and excellent wetting properties, so that the present invention is suitable as a magnetic material for high recording density, which is currently most in demand.
また、磁性塗料の製造に際して、上記磁性酸化
鉄粒子粉末を用いた場合には、ビヒクルへの分散
が良好であり、塗膜中での配向性及び充填性が極
めて優れ、好ましい磁気記録媒体を得ることがで
きる。 Furthermore, when the magnetic iron oxide particles described above are used in the production of a magnetic coating material, the dispersion in the vehicle is good, and the orientation and filling properties in the coating film are excellent, resulting in a desirable magnetic recording medium. be able to.
尚、前出の実験例及び以下の実施例並びに比較
例における磁性酸化鉄粒子粉末のかさ密度は
JISK5101「顔料試験方法」に従つて測定した。 In addition, the bulk density of the magnetic iron oxide particles in the above experimental examples, the following examples, and comparative examples is
Measured according to JISK5101 "Pigment test method".
実施例 １
第一鉄塩水溶液とアルカリとの反応水溶液を空
気酸化することにより針状晶ゲータイト粒子を生
成した。Example 1 Acicular goethite particles were produced by air oxidizing an aqueous reaction solution of a ferrous salt aqueous solution and an alkali.
生成粒子は常法により、水洗、別、乾燥、粉
砕した。 The resulting particles were washed with water, separated, dried, and pulverized by a conventional method.
得られた針状晶ゲータイト粒子を加熱脱水、還
元、再酸化して針状晶マグヘマイト粒子粉末を得
た。上記針状晶マグヘマイト粒子粉末1000ｇと酢
酸5.7ml（Fe2O3に対し0.6重量％に該当する。）と
をエツジランナー（新東工業(株)製ミツクスマラー
MSF−OL）に投入し、60分間圧密粉砕した。 The obtained acicular goethite particles were heated, dehydrated, reduced, and reoxidized to obtain acicular maghemite particles. 1000 g of the above acicular maghemite particles powder and 5.7 ml of acetic acid (corresponding to 0.6% by weight with respect to Fe 2 O 3 ) were mixed in an Edge Runner (Mitsumaru manufactured by Shinto Kogyo Co., Ltd.).
MSF-OL) and compacted and crushed for 60 minutes.
得られた酢酸が付着している針状晶マグヘマイ
ト粒子粉末のかさ密度は0.66ｇ／mlであつた。 The bulk density of the obtained acicular maghemite particles to which acetic acid was attached was 0.66 g/ml.
上記酢酸が付着している針状晶マグヘマイト粒
子粉末を用いて、適量の分散剤、塩化ビニル酢酸
ビニル共重合体樹脂、熱可塑性ポリウレタン樹脂
及びトルエン、メチルエチルケトン、メチルイソ
ブチルケトンからなる混合溶剤を一定の組成に配
合した後、ボールミルで８時間混合分散して磁気
塗料とした。分散過程を観察した結果、上記針状
晶マグヘマイト粒子の分散性及びぬれ特性は非常
に良好なものであつた。 Using the acicular maghemite particles to which acetic acid is attached, a suitable amount of a dispersant, a vinyl chloride vinyl acetate copolymer resin, a thermoplastic polyurethane resin, and a mixed solvent consisting of toluene, methyl ethyl ketone, and methyl isobutyl ketone are added to a certain amount. After blending into a composition, the mixture was mixed and dispersed in a ball mill for 8 hours to obtain a magnetic paint. As a result of observing the dispersion process, the dispersibility and wetting properties of the above-mentioned acicular maghemite particles were found to be very good.
得られた磁気塗料に上記混合溶剤を加え適当な
塗料粘度になるように調整し、ポリエステル樹脂
フイルム上に通常の方法で塗布し、磁場中配向後
乾燥させて、磁気テープを製造した。 The above-mentioned mixed solvent was added to the obtained magnetic paint to adjust the paint viscosity to an appropriate level, and the paint was coated on a polyester resin film in a conventional manner, oriented in a magnetic field, and then dried to produce a magnetic tape.
この磁気テープの保磁力Hcは383Oe、残留磁
束密度Brは1420Gauss、角型Br／Bmは0.83、配
向度2.35であつた。 This magnetic tape had a coercive force Hc of 383 Oe, a residual magnetic flux density Br of 1420 Gauss, a square shape Br/Bm of 0.83, and an orientation degree of 2.35.
実施例 ２
酢酸の添加量を2.9ml（Fe2O3に対し0.3重量％
に該当する。）とした以外は実施例１と同様にし
て酢酸が付着している針状晶マグヘマイト粒子粉
末を得た。Example 2 The amount of acetic acid added was 2.9 ml (0.3% by weight based on Fe 2 O 3 ).
Applies to. ) Acicular maghemite particle powder to which acetic acid was attached was obtained in the same manner as in Example 1.
得られた酢酸が付着している針状晶マグヘマイ
ト粒子粉末のかさ密度は0.62ｇ／mlであつた。 The bulk density of the obtained acicular maghemite particles to which acetic acid was attached was 0.62 g/ml.
上記酢酸が付着している針状晶マグヘマイト粒
子粉末を用いて、実施例１と同様にして磁性塗料
を作製し、磁気テープを製造した。 A magnetic paint was prepared in the same manner as in Example 1 using the acicular maghemite particle powder to which acetic acid was attached, and a magnetic tape was manufactured.
磁性塗料の作製において、分散過程を観察した
結果、酢酸が付着している針状晶マグヘマイト粒
子の分散性及びぬれ特性は非常に良好なものであ
つた。 During the preparation of the magnetic paint, the dispersion process was observed, and it was found that the acicular maghemite particles to which acetic acid was attached had very good dispersibility and wetting properties.
得られた磁気テープの保磁力Hcは386Oe、残
留磁束密度Brは1310Gauss、角型Br／Bmは
0.81、配向度2.27であつた。 The obtained magnetic tape had a coercive force Hc of 386 Oe, a residual magnetic flux density Br of 1310 Gauss, and a rectangular Br/Bm.
0.81, and the degree of orientation was 2.27.
実施例 ３
酢酸を添加しなかつた以外は、実施例１と同様
にして針状晶マグヘマイト粒子粉末を圧密粉砕し
た。Example 3 Acicular maghemite particles were compacted and ground in the same manner as in Example 1, except that acetic acid was not added.
圧密粉砕した針状晶マグヘマイト粒子粉末1000
ｇに酢酸12.4ml（Fe2O3に対し、1.3重量％に該当
する。）を添加し、十分混合した。 Consolidated and crushed acicular maghemite particles powder 1000
12.4 ml of acetic acid (corresponding to 1.3% by weight based on Fe 2 O 3 ) was added to the mixture and thoroughly mixed.
得られた酢酸が付着している針状晶マグヘマイ
ト粒子粉末のかさ密度は0.50ｇ／mlであつた。 The bulk density of the obtained acicular maghemite particles to which acetic acid was attached was 0.50 g/ml.
上記酢酸が付着している針状晶マグヘマイト粒
子粉末を用いて実施例１と同様にして磁性塗料を
作製し、磁気テープを製造した。 A magnetic paint was prepared in the same manner as in Example 1 using the acicular maghemite particle powder to which acetic acid was attached, and a magnetic tape was manufactured.
磁性塗料の作製において、分散過程を観察した
結果、酢酸が付着している針状晶マグヘマイト粒
子の分散性及びぬれ特性は非常に良好なものであ
つた。 During the preparation of the magnetic paint, the dispersion process was observed, and it was found that the acicular maghemite particles to which acetic acid was attached had very good dispersibility and wetting properties.
得られた磁気テープの保磁力Hcは380Oe、残
留磁束密度Brは1360Gauss、角型Br／Bmは
0.81、配向度2.19であつた。 The obtained magnetic tape had a coercive force Hc of 380 Oe, a residual magnetic flux density Br of 1360 Gauss, and a rectangular Br/Bm.
0.81, and the degree of orientation was 2.19.
比較例 １
酢酸を添加しなかつた以外は実施例１と同様に
して針状晶マグヘマイト粒子を圧密粉砕した。Comparative Example 1 Acicular maghemite particles were compacted and crushed in the same manner as in Example 1, except that acetic acid was not added.
得られた針状晶マグヘマイト粒子粉末のかさ密
度は0.47ｇ／mlであつた。 The bulk density of the obtained acicular maghemite particles was 0.47 g/ml.
上記圧密粉砕後の針状晶マグヘマイト粒子粉末
を用いてボールミルによる混合分散時間を12時間
にした以外は、実施例１と同様にして磁気塗料を
作製し、磁気テープを製造した。 A magnetic coating material was prepared and a magnetic tape was produced in the same manner as in Example 1, except that the acicular maghemite particles after compaction and pulverization were used and the mixing and dispersion time using a ball mill was changed to 12 hours.
磁性塗料の作製において、分散過程を観察した
結果、酢酸の付着していない針状晶マグヘマイト
粒子の分散性及びぬれ特性は非常に悪いものであ
つた。 Observation of the dispersion process during the production of magnetic paint revealed that the acicular maghemite particles to which acetic acid was not attached had very poor dispersibility and wetting properties.
得られた磁気テープの保磁力Hcは375Oe、残
留磁束密度Brは1210Gauss、角型Br／Bmは
0.77、配向度1.91であつた。 The obtained magnetic tape had a coercive force Hc of 375 Oe, a residual magnetic flux density Br of 1210 Gauss, and a rectangular Br/Bm.
0.77, and the degree of orientation was 1.91.
図１は、生成磁性酸化鉄粒子粉末の粉砕時に添
加した酢酸の添加量と酢酸が付着している磁性酸
化鉄粒子粉末のかさ密度との関係を示したもので
ある。
FIG. 1 shows the relationship between the amount of acetic acid added during pulverization of the generated magnetic iron oxide particles and the bulk density of the magnetic iron oxide particles to which acetic acid is attached.
Claims (1)
2.0重量％の酢酸を添加して粒子表面を酢酸で処
理して前記磁性酸化鉄粒子粉末の粒子表面に酢酸
を付着させることによつてかさ密度を大きくする
ことを特徴とする磁気記録用磁性酸化鉄粒子粉末
の処理法。 ２ 酢酸の添加量がFe2O3に対し0.2〜0.7重量％
である特許請求の範囲第１項記載の磁気記録用磁
性酸化鉄粒子粉末の処理法。 ３ 磁性酸化鉄粒子の酢酸による処理を粉砕工程
において行う特許請求の範囲第１項記載の磁気記
録用磁性酸化鉄粒子粉末の処理法。 ４ 粉砕工程が圧密粉砕工程である特許請求の範
囲第３項記載の磁気記録用磁性酸化鉄粒子粉末の
処理法。[Claims] 1. Magnetic iron oxide particles have a content of 0.1 to 0.1 to Fe 2 O 3
Magnetic oxide for magnetic recording, characterized in that bulk density is increased by adding 2.0% by weight of acetic acid and treating the particle surface with acetic acid to attach acetic acid to the particle surface of the magnetic iron oxide particle powder. Processing method for iron particle powder. 2 The amount of acetic acid added is 0.2 to 0.7% by weight based on Fe 2 O 3
A method for treating magnetic iron oxide particles for magnetic recording according to claim 1. 3. A method for treating magnetic iron oxide particles for magnetic recording according to claim 1, wherein the magnetic iron oxide particles are treated with acetic acid in the crushing step. 4. The method for processing magnetic iron oxide particles for magnetic recording according to claim 3, wherein the pulverization step is a consolidation pulverization step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58247521A JPS60137003A (en) | 1983-12-26 | 1983-12-26 | Treating method of magnetic iron oxide particle powder for magnetic recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58247521A JPS60137003A (en) | 1983-12-26 | 1983-12-26 | Treating method of magnetic iron oxide particle powder for magnetic recording |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60137003A JPS60137003A (en) | 1985-07-20 |
| JPH0544164B2 true JPH0544164B2 (en) | 1993-07-05 |
Family
ID=17164723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58247521A Granted JPS60137003A (en) | 1983-12-26 | 1983-12-26 | Treating method of magnetic iron oxide particle powder for magnetic recording |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60137003A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006023245A1 (en) * | 2006-05-18 | 2007-11-22 | Lanxess Deutschland Gmbh | Oxidation-stable iron oxide pigments, process for their preparation and their use |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5539655A (en) * | 1978-09-12 | 1980-03-19 | Hitachi Maxell Ltd | Treating method of magnetic powder |
-
1983
- 1983-12-26 JP JP58247521A patent/JPS60137003A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60137003A (en) | 1985-07-20 |
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| LAPS | Cancellation because of no payment of annual fees |