JP2000319022A - Iron oxide particulate powder - Google Patents
Iron oxide particulate powderInfo
- Publication number
- JP2000319022A JP2000319022A JP12504299A JP12504299A JP2000319022A JP 2000319022 A JP2000319022 A JP 2000319022A JP 12504299 A JP12504299 A JP 12504299A JP 12504299 A JP12504299 A JP 12504299A JP 2000319022 A JP2000319022 A JP 2000319022A
- Authority
- JP
- Japan
- Prior art keywords
- iron oxide
- particles
- octahedral
- magnetite
- spherical
- 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
- Developing Agents For Electrophotography (AREA)
- Compounds Of Iron (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Paints Or Removers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、酸化鉄粒子粉末に
関し、詳しくは異形状である球状酸化鉄粒子と八面体酸
化鉄粒子とを混在させることにより、流動性、分散性、
ハンドリング性等の諸特性をバランスよく向上させた、
特に静電複写磁性トナー用材料粉、静電潜像現像用キャ
リア用材料粉、塗料用黒色顔料粉等の用途に主に用いら
れる酸化鉄粒子粉末に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to iron oxide particles, and more particularly, to a mixture of irregularly shaped spherical iron oxide particles and octahedral iron oxide particles to obtain fluidity, dispersibility,
Various characteristics such as handling characteristics have been improved in a well-balanced manner.
In particular, the present invention relates to iron oxide particle powder mainly used for applications such as material powder for magnetic toner for electrostatic copying, material powder for carrier for developing an electrostatic latent image, and black pigment powder for paint.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】最近、
電子写真複写機、プリンター等の磁性トナー用材料とし
て、水溶液反応による酸化鉄粒子が広く利用されてい
る。2. Description of the Related Art Recently,
BACKGROUND ART Iron oxide particles formed by an aqueous solution reaction are widely used as materials for magnetic toners of electrophotographic copying machines, printers, and the like.
【０００３】磁性トナーとしては各種の一般的現像特性
が要求されるが、近年、電子写真技術の発達により、特
にデジタル技術を用いた複写機、プリンターが急速に発
達し、要求特性がより高度になってきた。[0003] Various general developing characteristics are required for magnetic toners. In recent years, with the development of electrophotography technology, in particular, copiers and printers using digital technology have rapidly developed, and the required characteristics have become more sophisticated. It has become.
【０００４】すなわち、従来の文字以外にもグラフィッ
クや写真等の出力も要求されており、特にプリンターの
中には１インチ当たり１２００ドット以上の能力のもの
も現れ、感光体上の潜像はより緻密になってきている。
そのため、現像での細線再現性の高さが強く要求されて
いる。That is, in addition to the conventional characters, output of graphics, photographs, and the like is also required. In particular, some printers having a capacity of 1200 dots per inch or more appear, and the latent image on the photoreceptor becomes more difficult. It is getting finer.
Therefore, high reproducibility of fine lines in development is strongly required.
【０００５】また、それに伴うトナーも小粒径化されて
おり、より一層の酸化鉄粒子の樹脂への分散が要求され
ている。[0005] Further, the toner particles have been reduced in particle size, and it is required to further disperse the iron oxide particles in the resin.
【０００６】一般的に、トナー、キャリア、顔料を製造
する際に、酸化鉄粒子と樹脂の計量、混合、混練を行
う。その中で、分散性をよくするためには、計量時又は
混合後の混練機への供給性、比重の低い樹脂との混合性
をよくする必要がある。一方、高解像度化が進み、残留
磁化の低いものが好まれており、またトナーの小粒径化
に伴い、それに使用される酸化鉄粒子も小粒径化が必要
である。In general, when producing toners, carriers and pigments, the iron oxide particles and the resin are measured, mixed and kneaded. Among them, in order to improve the dispersibility, it is necessary to improve the supply to a kneader at the time of measurement or after mixing, and the mixing with a resin having a low specific gravity. On the other hand, higher resolution has been promoted, and those having low residual magnetization have been preferred. Further, as the particle size of the toner has been reduced, the iron oxide particles used in the toner also need to be reduced in particle size.
【０００７】酸化鉄粒子の比重は、樹脂より重く混合時
に分離する可能性があるので、振動があっても嵩密度の
低いものであれば、比重の低いものとの混合性を向上す
ることができ、ひいては混練後の分散性を向上すること
ができる。また、そういうものは輸送時にも粉体がしま
りにくく、取り扱い性も良好である。Since the specific gravity of iron oxide particles is heavier than resin and may be separated during mixing, if the bulk density is low even if there is vibration, it is possible to improve the mixing property with low specific gravity. Thus, the dispersibility after kneading can be improved. In addition, such a material is hardly compacted during transportation and has good handleability.
【０００８】しかし、一般的に球状酸化鉄粒子が低残留
磁化であることが広く知られているが、球状品は通常最
密充填を取りやすく嵩密度が高くなる傾向があり、流動
性の面でも問題があった。流動性の改良については従来
から種々の提案が試みられているが、その結果として粉
体の流動性は向上するが、嵩密度がさらに高くなる傾向
にあった。[0008] However, it is widely known that spherical iron oxide particles generally have low remanent magnetization. However, spherical articles usually have a tendency to be easily packed in a close-packed manner and tend to have a high bulk density. But there was a problem. Various proposals have been made to improve the fluidity, but as a result, the fluidity of the powder is improved, but the bulk density tends to be higher.
【０００９】また、酸化鉄粒子の代表的な形状として八
面体がある。八面体の酸化鉄粒子は、嵩密度が一般的に
低いが、その形状より残留磁化が高く、細線再現性に問
題があった。An octahedron is a typical shape of the iron oxide particles. Octahedral iron oxide particles generally have a low bulk density, but have a higher remanence than their shapes, and have a problem in fine line reproducibility.
【００１０】このように、流動性が高く、かつ充填密度
が低く、しかも磁気特性に優れた酸化鉄粒子は未だ提供
されていない。As described above, iron oxide particles having high fluidity, low packing density, and excellent magnetic properties have not yet been provided.
【００１１】従って、本発明の目的は、流動性が高く、
かつ充填密度が低く、しかも磁気特性に優れた酸化鉄粒
子粉末を提供することにある。[0011] Accordingly, an object of the present invention is to provide a high fluidity,
Another object of the present invention is to provide an iron oxide particle powder having a low packing density and excellent magnetic properties.
【００１２】[0012]
【課題を解決するための手段】本発明者らは、検討の結
果、球状と八面体の酸化鉄粒子を混在させることによっ
て、上記目的が達成し得ることを知見した。As a result of the study, the present inventors have found that the above object can be achieved by mixing spherical and octahedral iron oxide particles.
【００１３】本発明は、上記知見に基づきなされたもの
で、球状酸化鉄粒子と八面体酸化鉄粒子が混在すること
を特徴とする酸化鉄粒子粉末を提供するものである。The present invention has been made on the basis of the above findings, and provides an iron oxide particle powder characterized in that spherical iron oxide particles and octahedral iron oxide particles are mixed.
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施の形態につい
て説明する。本発明でいう酸化鉄粒子とは、好ましくは
マグネタイトを主成分とするものであり、ケイ素、アル
ミニウム、チタン等の各種有効元素含有するもの、ある
いはこれら有効元素で被覆されたものも含まれる。以下
の説明では、酸化鉄粒子としてその代表的なものである
マグネタイト粒子について説明する。また、酸化鉄粒子
又はマグネタイト粒子というときには、その内容によっ
て個々の粒子又はその集合のいずれも意味する。また、
酸化鉄粒子粉末又はマグネタイト粒子粉末とは、形状、
粒径の異なる酸化鉄粒子又はマグネタイト粒子が混在し
たものをいう。Embodiments of the present invention will be described below. The iron oxide particles referred to in the present invention preferably contain magnetite as a main component, and include those containing various effective elements such as silicon, aluminum, and titanium, or those coated with these effective elements. In the following description, magnetite particles, which are typical iron oxide particles, will be described. Further, when referring to iron oxide particles or magnetite particles, it means either individual particles or their aggregates depending on the content. Also,
Iron oxide particle powder or magnetite particle powder, shape,
It refers to a mixture of iron oxide particles or magnetite particles having different particle sizes.
【００１５】本発明のマグネタイト粒子粉末は、球状マ
グネタイト粒子と八面体マグネタイト粒子が混在したも
のである。ここで球状とは、走査型電子顕微鏡で観察し
たときに、角や辺がなく、長軸／短軸の比率が１〜１．
２のものをいう。また、八面体とは、走査型電子顕微鏡
で観察したときに、角と辺を持ち、一つの角に辺を４つ
持つものをいう。この球状又は八面体のマグネタイト粒
子は、水酸化第一鉄スラリーを酸化する際のｐＨを制御
することにより得られる。The magnetite particle powder of the present invention is a mixture of spherical magnetite particles and octahedral magnetite particles. Here, the term “spherical” means that when observed with a scanning electron microscope, there are no corners or sides, and the ratio of the major axis / minor axis is 1-1.
Two things. An octahedron has a corner and sides when observed with a scanning electron microscope, and has four sides at one corner. The spherical or octahedral magnetite particles can be obtained by controlling the pH at which the ferrous hydroxide slurry is oxidized.
【００１６】本発明のマグネタイト粒子粉末は、個数平
均粒径が０．１５〜０．５μｍである。また、全個数に
対する八面体マグネタイト粒子の存在個数率［八面体マ
グネタイト粒子個数／（球状マグネタイト粒子個数＋八
面体マグネタイト粒子個数）×１００］が５〜９０％
で、その中の球状マグネタイト粒子の平均粒径をＸμ
ｍ、八面体マグネタイト粒子の平均粒径をＹμｍ、八面
体マグネタイト粒子の存在個数率Ｚ（％）とした時、下
記式（１）を満足することが望ましい。 １０≦（５．２／６×πＹ3 Ｚ）／［（５．２／６×πＹ3 Ｚ）＋（５．２／ ６×πＸ3 （１−Ｚ）］×１００・・・・・（１）The magnetite particle powder of the present invention has a number average particle size of 0.15 to 0.5 μm. Further, the ratio of the number of octahedral magnetite particles present to the total number [octahedral magnetite particle number / (spherical magnetite particle number + octahedral magnetite particle number) × 100] is 5 to 90%.
And the average particle size of the spherical magnetite particles in the
m, the average particle diameter of the octahedral magnetite particles is Y μm, and the number of octahedral magnetite particles abundance Z (%), it is desirable to satisfy the following expression (1). 10 ≦ (5.2 / 6 × πY 3 Z) / [(5.2 / 6 × πY 3 Z) + (5.2 / 6 × πX 3 (1-Z)] × 100... 1)
【００１７】八面耐マグネタイト粒子の存在個数率は、
好ましくは５〜９０％、さらに好ましくは１６〜８０％
である。この存在個数率が５％未満、又は９０％を超え
る場合、流動性の改善効果が少ない。The number ratio of the octahedral magnetite particles is as follows:
Preferably 5-90%, more preferably 16-80%
It is. When the abundance ratio is less than 5% or more than 90%, the effect of improving the fluidity is small.
【００１８】何故、異形状粒子が混在すると流動性が改
善されるかについては定かではないが、活性点の異なる
粒子の混在により、コロの原理が作用していることが推
測される。Although it is not clear why fluidity is improved when mixed particles of different shapes are mixed, it is presumed that the mixture of particles having different active points has an effect of the roller principle.
【００１９】また、上記式（１）は、マグネタイト粒子
粉末中の粒子すべてを球状粒子と考えた場合に、体積と
真比重よりマグネタイト粒子粉末中の八面体粒子の重量
比を計算したものである。この式（１）を満たさない場
合、すなわち八面体マグネタイト粒子の重量存在率が１
０重量％未満の場合、タップ密度が高くなり、輸送中の
粉体にしまりが生じ、以降の取扱い性が悪くなる上、樹
脂との混合性が不良となる。The above formula (1) is obtained by calculating the weight ratio of the octahedral particles in the magnetite particle powder from the volume and the true specific gravity when all the particles in the magnetite particle powder are considered to be spherical particles. . When the formula (1) is not satisfied, that is, when the weight abundance of the octahedral magnetite particles is 1
If the amount is less than 0% by weight, the tap density becomes high, the powder during transportation becomes tight, the subsequent handling becomes poor, and the mixing with the resin becomes poor.
【００２０】本発明のマグネタイト粒子粉末は、タップ
密度が１．４ｇ／ｃｍ3 以下であることが必要である。
タップ密度が１．４ｇ／ｃｍ3 を超えると充填密度の上
昇を抑えることができない。また、残留磁化（σｒ）
は、磁気凝集による流動性への影響を考慮すると８ｅｍ
ｕ／ｇ以下が好ましい。The magnetite particle powder of the present invention needs to have a tap density of 1.4 g / cm 3 or less.
If the tap density exceeds 1.4 g / cm 3 , an increase in the packing density cannot be suppressed. Also, the residual magnetization (σr)
Is 8 em in consideration of the influence of magnetic aggregation on fluidity.
u / g or less is preferable.
【００２１】本発明のマグネタイト粒子粉末は、流動性
の向上という観点から、安息角が好ましくは４２°以
下、さらに好ましくは４０°以下である。The magnetite particle powder of the present invention has an angle of repose of preferably 42 ° or less, more preferably 40 ° or less, from the viewpoint of improving fluidity.
【００２２】[0022]
【実施例】以下、実施例等に基づき本発明を具体的に説
明する。なお、本発明は八面体粒子と球状粒子が混在し
ていることが重要であり、かかる事例に限定されるもの
ではない。EXAMPLES Hereinafter, the present invention will be specifically described based on examples and the like. In the present invention, it is important that octahedral particles and spherical particles coexist, and the present invention is not limited to such a case.
【００２３】〔比較例１〕Ｆｅ2+２．０ｍｏｌ／リット
ルを含む硫酸第一鉄水溶液５０リットルと、５．０ｍｏ
ｌ／リットルの水酸化ナトリウム水溶液３６リットルを
混合撹拌した。この時のｐＨは６．５であった。そのス
ラリーを８５℃に維持しながら３０リットル／ｍｉｎの
空気を吹き込み、ｐＨを５〜９に維持して反応を終了さ
せた。得られた生成粒子は、通常の濾過、洗浄、乾燥、
粉砕工程により処理し、球状マグネタイト粒子を得た。Comparative Example 1 50 liters of an aqueous ferrous sulfate solution containing 2.0 mol / liter of Fe 2+ and 5.0 mo
36 liters of a 1 / liter aqueous sodium hydroxide solution were mixed and stirred. The pH at this time was 6.5. While maintaining the slurry at 85 ° C., air was blown at 30 liter / min to maintain the pH at 5 to 9 and terminate the reaction. The resulting product particles are filtered, washed, dried,
Processing was performed by a pulverizing step to obtain spherical magnetite particles.
【００２４】〔比較例２及び３〕比較例１と同様の反応
において、空気吹き込み量を５０リットル／ｍｉｎ（比
較例２）、７０リットル／ｍｉｎ（比較例３）とし、所
望の粒径の生成粒子を得た。得られた生成粒子は通常の
濾過、洗浄、乾燥、粉砕工程により処理し、球状マグネ
タイト粒子を得た。[Comparative Examples 2 and 3] In the same reaction as in Comparative Example 1, the air blowing rate was set to 50 L / min (Comparative Example 2) and 70 L / min (Comparative Example 3), and the desired particle size was formed. Particles were obtained. The resulting product particles were subjected to ordinary filtration, washing, drying, and pulverization steps to obtain spherical magnetite particles.
【００２５】〔比較例４〕Ｆｅ2+２．０ｍｏｌ／リット
ルを含む硫酸第一鉄水溶液５０リットルと、５．２ｍｏ
ｌ／リットルの水酸化ナトリウム水溶液４０リットルを
混合撹拌した。この時のｐＨは１１であった。そのスラ
リーを８５℃に維持しながら３０リットル／ｍｉｎの空
気を吹き込み、ｐＨを１０以上にて反応を終了させた。
得られた生成粒子は、通常の濾過、洗浄、乾燥、粉砕工
程により処理し、八面体マグネタイト粒子を得た。Comparative Example 4 A 50 liter aqueous solution of ferrous sulfate containing 2.0 mol / liter of Fe 2+ was added to 5.2 mol of an aqueous solution of ferrous sulfate.
40 liters of a 1 / liter aqueous sodium hydroxide solution were mixed and stirred. The pH at this time was 11. While maintaining the slurry at 85 ° C., air was blown at 30 liters / min to terminate the reaction at a pH of 10 or more.
The resulting product particles were subjected to ordinary filtration, washing, drying and pulverization steps to obtain octahedral magnetite particles.
【００２６】〔比較例５及び６〕比較例４と同様の反応
において、空気吹き込み量を４０リットル／ｍｉｎ（比
較例２）、５０リットル／ｍｉｎ（比較例３）とし、所
望の粒径の生成粒子を得た。得られた生成粒子は通常の
濾過、洗浄、乾燥、粉砕工程により処理し、八面体マグ
ネタイト粒子を得た。Comparative Examples 5 and 6 In the same reaction as in Comparative Example 4, the air blowing rate was set to 40 L / min (Comparative Example 2) and 50 L / min (Comparative Example 3), and the desired particle size was formed. Particles were obtained. The resulting product particles were subjected to usual filtration, washing, drying and pulverization steps to obtain octahedral magnetite particles.
【００２７】〔実施例１〕比較例１の球状マグネタイト
粒子７００ｇ、比較例４の八面体マグネタイト粒子３０
０ｇをＶ型ブレンダーを用い、２０分間混合して球状マ
グネタイト粒子と八面体マグネタイト粒子の混在するマ
グネタイト粒子粉末を得た。Example 1 700 g of spherical magnetite particles of Comparative Example 1 and octahedral magnetite particles 30 of Comparative Example 4
0 g was mixed using a V-type blender for 20 minutes to obtain magnetite particle powder in which spherical magnetite particles and octahedral magnetite particles were mixed.
【００２８】〔実施例２〜３４〕表２〜３に示すマグネ
タイト粒子粉末となるように、比較例１〜６のマグネタ
イト粒子を用い、総重量１０ｋｇのマグネタイト粒子を
実施例１と同様にＶ型ブレンダーで混合し、マグネタイ
ト粒子粉末を得た。[Examples 2 to 34] The magnetite particles of Comparative Examples 1 to 6 were used to obtain the magnetite particle powders shown in Tables 2 and 3, and a total of 10 kg of magnetite particles were V-shaped in the same manner as in Example 1. The mixture was mixed with a blender to obtain magnetite particle powder.
【００２９】〔実施例３５〕比較例１の反応終了後のス
ラリー７リットルと比較例４の反応終了後のスラリー３
リットルを混合し、通常の濾過、洗浄、乾燥、粉砕工程
により処理し、マグネタイト粒子粉末を得た。Example 35 7 liters of the slurry after the reaction of Comparative Example 1 and the slurry 3 after the reaction of Comparative Example 4
Liters were mixed and treated by usual filtration, washing, drying and pulverization steps to obtain magnetite particle powder.
【００３０】このようにして得られた比較例１〜６のマ
グネタイト粒子又は実施例１〜３５のマグネタイト粒子
粉末について、下記の評価（平均粒径、全個数に対する
八面体マグネタイト粒子の存在個数率、式（１）による
八面体マグネタイト粒子の重量存在率、磁気特性、タッ
プ密度、安息角）を行った。結果を表１〜３に示す。With respect to the magnetite particles of Comparative Examples 1 to 6 or the magnetite particle powders of Examples 1 to 35 thus obtained, the following evaluation (average particle diameter, percentage of octahedral magnetite particles relative to the total number, The weight abundance, magnetic properties, tap density, angle of repose of the octahedral magnetite particles according to equation (1) were determined. The results are shown in Tables 1 to 3.
【００３１】＜評価方法＞ （１）平均粒径 走査型電子顕微鏡にて３万倍の写真を撮影し、２００個
測定し、フィレ径にてマグネタイト粒子粉末の個数平均
を求めた。その時に八面体マグネタイト粒子、球状マグ
ネタイト粒子の個数もチェックした。また、各形状の平
均粒径はそれぞれの形状の測定を１００個測定し、各形
状の個数平均粒径を求めた。 （２）全個数に対する八面体マグネタイト粒子の存在個
数率 上記（１）にてマグネタイト粒子粉末の平均粒径測定時
にチェックした各形状の個数を用い、八面体マグネタイ
ト粒子個数／（球状マグネタイト粒子個数＋八面体マグ
ネタイト粒子個数）×１００で求めた。 （３）式（１）による八面体マグネタイト粒子の重量存
在率 球状マグネタイト粒子の平均粒径をＸμｍ、八面体マグ
ネタイト粒子の平均粒径をＹμｍ、八面体マグネタイト
粒子の存在個数率Ｚ（％）とした時、下記式（１）の値
を求めた。 Ａ＝（５．２／６×πＹ3 Ｚ）／［（５．２／６×πＹ3 Ｚ）＋（５．２／６ ×πＸ3 （１−Ｚ）］×１００・・・・・（１） （４）磁気特性 東英工業製振動型磁力計ＶＳＭ−Ｐ７を用い、外部磁場
１ｋＯｅ、５ｋＯｅにて測定した。 （５）タップ密度、安息角 Ｈｏｓｏｋａｗａ Ｍｉｃｒｏｎ社製、「Ｐｏｗｄｅｒ
Ｔｅｓｔｅｒ ＴｙｐｅＰＴ−Ｅ」（商品名）を用い
て、タップ密度、安息角を求めた。<Evaluation Method> (1) Average Particle Size A 30,000-fold photograph was taken with a scanning electron microscope, 200 pieces were measured, and the number average of the magnetite particle powder was determined based on the fillet diameter. At that time, the number of octahedral magnetite particles and spherical magnetite particles was also checked. The average particle size of each shape was determined by measuring 100 shapes and measuring the number average particle size of each shape. (2) Percentage of octahedral magnetite particles present to the total number Using the number of each shape checked at the time of measuring the average particle size of the magnetite particle powder in (1) above, the number of octahedral magnetite particles / (the number of spherical magnetite particles + The number of octahedral magnetite particles) × 100. (3) Weight abundance of octahedral magnetite particles according to equation (1) The average particle size of spherical magnetite particles is X μm, the average particle size of octahedral magnetite particles is Y μm, and the abundance ratio Z (%) of octahedral magnetite particles is Then, the value of the following equation (1) was obtained. A = (5.2 / 6 × πY 3 Z) / [(5.2 / 6 × πY 3 Z) + (5.2 / 6 × πX 3 (1-Z)] × 100... 1) (4) Magnetic properties Measured with an external magnetic field of 1 kOe and 5 kOe using a vibration magnetometer VSM-P7 manufactured by Toei Kogyo Co., Ltd. (5) Tap density, angle of repose "Powder" manufactured by Hosokawa Micron
The tap density and angle of repose were determined using “Tester TypePT-E” (trade name).
【００３２】[0032]
【表１】 [Table 1]
【００３３】[0033]
【表２】 [Table 2]
【００３４】[0034]
【表３】 [Table 3]
【００３５】表１に示されるように、比較例１〜３の球
状マグネタイト粒子は、タップ密度が高く、安息角が大
きい。また、比較例４〜６の八面体マグネタイト粒子
は、残留磁化が高く、安息角も大きい。As shown in Table 1, the spherical magnetite particles of Comparative Examples 1 to 3 have a high tap density and a large angle of repose. In addition, the octahedral magnetite particles of Comparative Examples 4 to 6 have high residual magnetization and a large angle of repose.
【００３６】これに対して、実施例１〜３５のマグネタ
イト粒子粉末は、タップ密度が低く、安息角が小さく、
しかも残留磁化も低い。On the other hand, the magnetite particle powders of Examples 1 to 35 have low tap density, small angle of repose,
Moreover, the residual magnetization is low.
【００３７】[0037]
【発明の効果】以上説明したように、本発明の酸化鉄粒
子粉末は、流動性が高く、かつ充填密度が低く、しかも
磁気特性に優れる。As described above, the iron oxide particles of the present invention have high fluidity, low packing density and excellent magnetic properties.
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｇ０３Ｇ 9/107 Ｇ０３Ｇ 9/10 ３１１ ３３１ Ｆターム(参考） 2H005 AA02 BA02 BA03 CB03 EA02 EA05 EA07 EA10 4G002 AA04 AB04 AD04 AE01 AE02 4J037 AA15 CA09 DD05 DD12 DD30 EE28 FF01 FF05 FF15 4J038 HA216 KA07 KA08 KA18 KA20 NA22 NA23 Continued on the front page (51) Int.Cl. 7 Identification code FI Theme coat II (reference) G03G 9/107 G03G 9/10 311 331 F term (reference) 2H005 AA02 BA02 BA03 CB03 EA02 EA05 EA07 EA10 4G002 AA04 AB04 AD04 AE01 AE02 4J037 AA15 CA09 DD05 DD12 DD30 EE28 FF01 FF05 FF15 4J038 HA216 KA07 KA08 KA18 KA20 NA22 NA23
Claims (4)
在することを特徴とする酸化鉄粒子粉末。An iron oxide particle powder comprising a mixture of spherical iron oxide particles and octahedral iron oxide particles.
かつ全個数に対する八面体酸化鉄粒子の存在個数率［八
面体酸化鉄粒子個数／（球状酸化鉄粒子個数＋八面体酸
化鉄粒子個数）×１００］が５〜９０％で、その中の球
状酸化鉄粒子の平均粒径をＸμｍ、八面体酸化鉄粒子の
平均粒径をＹμｍ、八面体酸化鉄粒子の存在個数率Ｚ
（％）とした時、下記式（１）を満足する請求項１に記
載の酸化鉄粒子粉末。 １０≦（５．２／６×πＹ3 Ｚ）／［（５．２／６×πＹ3 Ｚ）＋（５．２／ ６×πＸ3 （１−Ｚ）］×１００・・・・・（１）2. A number average particle size of 0.15 to 0.5 μm,
And the ratio of the number of octahedral iron oxide particles present to the total number [octahedral iron oxide particle number / (number of spherical iron oxide particles + number of octahedral iron oxide particles) × 100] is 5 to 90%, and the spherical oxides therein The average particle size of the iron particles is X μm, the average particle size of the octahedral iron oxide particles is Y μm, and the number ratio of the octahedral iron oxide particles Z
The iron oxide particle powder according to claim 1, which satisfies the following expression (1) when expressed as (%). 10 ≦ (5.2 / 6 × πY 3 Z) / [(5.2 / 6 × πY 3 Z) + (5.2 / 6 × πX 3 (1-Z)] × 100... 1)
残留磁化が８ｅｍｕ／ｇ以下で、タップ密度１．４ｇ／
ｃｍ3 以下である請求項１又は２記載の酸化鉄粒子粉
末。3. The remanent magnetization at an external magnetic field of 5 kOe or 1 kOe is 8 emu / g or less and the tap density is 1.4 g / g.
3. The iron oxide particle powder according to claim 1, having a size of not more than cm 3 .
又は３に記載の酸化鉄粒子粉末。4. The method according to claim 1, wherein the angle of repose is 42 ° or less.
Or the iron oxide particle powder according to 3.
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| JP12504299A JP3600754B2 (en) | 1999-04-30 | 1999-04-30 | Iron oxide particle powder |
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|---|---|---|---|
| JP12504299A JP3600754B2 (en) | 1999-04-30 | 1999-04-30 | Iron oxide particle powder |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010207760A (en) * | 2009-03-11 | 2010-09-24 | Toshiba Corp | Oil adsorbent and oil recovery method |
| WO2014024464A1 (en) * | 2012-08-08 | 2014-02-13 | キヤノン株式会社 | Magnetic carrier and two-component developer |
| JP2022117444A (en) * | 2021-01-29 | 2022-08-10 | キヤノン株式会社 | magnetic toner |
-
1999
- 1999-04-30 JP JP12504299A patent/JP3600754B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010207760A (en) * | 2009-03-11 | 2010-09-24 | Toshiba Corp | Oil adsorbent and oil recovery method |
| US8470731B2 (en) | 2009-03-11 | 2013-06-25 | Kabushiki Kaisha Toshiba | Oil adsorbent, and method for recovering the same |
| WO2014024464A1 (en) * | 2012-08-08 | 2014-02-13 | キヤノン株式会社 | Magnetic carrier and two-component developer |
| JP2022117444A (en) * | 2021-01-29 | 2022-08-10 | キヤノン株式会社 | magnetic toner |
| JP7346613B2 (en) | 2021-01-29 | 2023-09-19 | キヤノン株式会社 | magnetic toner |
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