JP2007321043A - Iron oxide fine particles and magenta ink - Google Patents
Iron oxide fine particles and magenta ink Download PDFInfo
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本発明は、建材等の分野で、インクジェット方式の印刷や塗装に使用される酸化鉄微粒子とその酸化鉄微粒子を用いたマゼンダインクに関するものである。 The present invention relates to iron oxide fine particles used for ink jet printing and painting in the field of building materials and the like, and magenta ink using the iron oxide fine particles.
パソコン等のＯＡ機器に接続されるプリンタやデジタル写真のプリンタには、インクジェット方式のものが多く採用されている。これらインクジェット方式のプリンタでは、シアン、マゼンダ、イエロー、ブラック等の色インクが用いられているが、それらの着色剤には、主に、有機染料や有機顔料が用いられている。 Inkjet printers are often used as printers connected to OA devices such as personal computers and printers for digital photographs. In these ink jet printers, color inks such as cyan, magenta, yellow, and black are used. However, organic dyes and organic pigments are mainly used as the colorants.
また、近年では、インクジェット方式は、上記のようなプリンタ用途以外にも、建築分野で用いられる化粧板や、美術タイル等の陶材あるいはセラミックスのように、着色後に焼成を施すもの等への着色や模様付けにも、その適用が検討されている（例えば、特許文献１〜４参照）。また、上記に伴い、それぞれの分野に適した印刷装置も提案されている（例えば、特許文献５〜７参照）。 In addition, in recent years, in addition to the printer application as described above, the ink jet system is used for coloring decorative plates used in the field of construction, ceramics such as art tiles, and ceramics that are fired after coloring. Its application is also being studied for patterning and patterning (see, for example, Patent Documents 1 to 4). Along with the above, printing apparatuses suitable for each field have been proposed (see, for example, Patent Documents 5 to 7).
斯かる建材分野等で用いられる印刷物や塗装物は、屋外で長期に亘り使用されるものが多い。そのため、従来のプリンタによる印刷物と異なり、紫外線や風雨による退色等が起こらないこと、即ち、耐光性や耐候性に優れることが強く求められる。しかし、従来のインクジェット方式のプリンタで使用されているインクの着色剤は、耐光性や耐候性に問題があり、建材分野等で用いられる用途には適していない。また、有機染料や有機顔料は、焼成を伴う陶材への着色剤としては適したものではない。したがって、これらの用途に用いる耐光性や耐候性に優れる無機顔料の開発が望まれている。 Many printed materials and painted materials used in the field of building materials and the like are used outdoors for a long time. Therefore, unlike a printed matter obtained by a conventional printer, it is strongly demanded that no fading or the like due to ultraviolet rays or wind and rain occurs, that is, excellent in light resistance and weather resistance. However, ink colorants used in conventional ink jet printers have problems in light resistance and weather resistance, and are not suitable for use in the field of building materials. Also, organic dyes and organic pigments are not suitable as colorants for porcelain with firing. Accordingly, development of inorganic pigments excellent in light resistance and weather resistance for use in these applications is desired.
しかしながら、従来の無機顔料からなる着色剤は、粒径が大きくて分散性が悪いため、プリンタのプリントヘッドの目詰まりを起こし易く、吐出安定性が悪いという問題があり、また、色調の面でも、従来の有機系のものと比べて劣るという問題があった。そのため、従来の無機顔料は、その用途が限られたものでしかなかった。
そこで、印刷物や塗装物の屋外での使用を可とするため、耐光性や耐候性に優れた無機顔料を用いたインクジェット用のインクの開発が行われている。たとえば、赤系統の色については、マゼンダ色のインクの顔料（着色剤）として、酸化鉄（Ｆｅ２Ｏ３；ヘマタイト）を用いることが検討されている。 Therefore, in order to allow printed materials and painted materials to be used outdoors, ink-jet inks using inorganic pigments having excellent light resistance and weather resistance have been developed. For example, for red colors, it has been studied to use iron oxide (Fe 2 O 3 ; hematite) as a pigment (colorant) for magenta ink.
一般に、顔料用の酸化鉄（ヘマタイト）は、硫酸鉄溶液をアルカリ溶液で中和して空気酸化することでマグネタイト（Ｆｅ２Ｏ３）を生成させ、このマグネタイトを熱処理する湿式法で製造している。この酸化鉄の色調の鮮やかさは、酸化鉄中に含まれるＭｎ量が大きく影響していることが知られており、従来から、鮮やかな赤色を得るために、Ｍｎ含有量の少ない硫酸鉄溶液を原料として使用したり、Ｍｎが取り込まれ難い条件でマグネタイトを合成したりすることが行われている。 In general, iron oxide (hematite) for pigments is produced by a wet method in which an iron sulfate solution is neutralized with an alkali solution and air oxidized to generate magnetite (Fe 2 O 3 ), and the magnetite is heat-treated. Yes. It is known that the vividness of the color tone of iron oxide is greatly influenced by the amount of Mn contained in the iron oxide. Conventionally, in order to obtain a bright red color, an iron sulfate solution with a low Mn content is used. Is used as a raw material, or magnetite is synthesized under conditions where Mn is hardly taken up.
しかしながら、上記のような方法で製造した赤色顔料用酸化鉄は、鮮やかな赤色を示すが、これをプリントヘッドで目詰まりを起こさないように微粒化した場合には、黄色味の強いオレンジ色がかった赤色になって、マゼンダインクには適さないものとなってしまうという問題があった。 However, the iron oxide for red pigments produced by the method described above shows a bright red color, but when it is atomized so as not to cause clogging by the print head, it has a strong yellowish orange color. There is a problem that the color becomes red and becomes unsuitable for magenta ink.
そこで、本発明の目的は、屋外等において耐光性や耐候性に優れると共に、微粒子化しても黄色味掛かることがなく鮮やかなマゼンダ色を示すインクジェット用インクの着色剤として好適な酸化鉄微粒子と、その酸化鉄微粒子を用いたマゼンダインクを提供することにある。 Therefore, the object of the present invention is excellent in light resistance and weather resistance outdoors and the like, and iron oxide fine particles suitable as a colorant for ink-jet ink showing a bright magenta color without being yellowish even if finely divided, The object is to provide a magenta ink using the iron oxide fine particles.
発明者らは、従来技術が抱える上記問題点を解決すべく、鋭意検討を重ねた。その結果、酸化鉄を微粒子化しても、色調が黄色味掛からないようにするためには、酸化鉄Ｆｅ２Ｏ３中のＦｅ原子の一部を、他の適正な元素で置換してやることが有効であることを見出し、本発明を完成させた。 Inventors repeated earnest examination in order to solve the said problem which a prior art has. As a result, it is effective to replace some of the Fe atoms in the iron oxide Fe 2 O 3 with other appropriate elements in order to prevent the color tone from becoming yellowish even when the iron oxide is finely divided. As a result, the present invention was completed.
すなわち本発明は、平均粒径が１５０ｎｍ以下のＦｅ２Ｏ３粉であって、このＦｅ２Ｏ３のＦｅ原子の一部が、Ｖ，Ｎｂ，Ｔａ，Ｃｒ，Ｍｏ，Ｗ，Ｃｏ，Ｎｉ，ＣｕおよびＡｇの中から選ばれる１種以上の元素により、合計で０．３〜９ｍｏｌ％置換されてなるマゼンダインク用酸化鉄微粒子である。 That is, the present invention is Fe 2 O 3 powder having an average particle size of 150 nm or less, and a part of Fe atoms of this Fe 2 O 3 is V, Nb, Ta, Cr, Mo, W, Co, Ni, It is iron oxide fine particles for magenta ink that is substituted in total by 0.3 to 9 mol% with one or more elements selected from Cu and Ag.
本発明の酸化鉄微粒子は、インク用溶媒に分散させた時の凝集粒子の最大粒径が２μｍ以下であることを特徴とする。 The iron oxide fine particles of the present invention are characterized in that the maximum particle size of the aggregated particles when dispersed in an ink solvent is 2 μm or less.
また本発明は、上記酸化鉄微粒子を着色剤として含有するマゼンダインクである。 The present invention also provides a magenta ink containing the iron oxide fine particles as a colorant.
本発明によれば、耐光性や耐候性に優れていると共に、黄色味を抑えた紫色に近い鮮やかなマゼンダ色を有する酸化鉄微粒子を得ることができる。そして、この酸化鉄微粒子は、建材等、屋外で使用されるものの印刷や塗装に用いられるマゼンダインクの着色剤として好適に用いることができる。 ADVANTAGE OF THE INVENTION According to this invention, while being excellent in light resistance and a weather resistance, the iron oxide microparticles | fine-particles which have the vivid magenta color near purple which suppressed yellowishness can be obtained. And this iron oxide microparticles | fine-particles can be used suitably as a coloring agent of the magenta ink used for printing and coating of things used outdoors, such as building materials.
本発明に係る酸化鉄微粒子について説明する。
本発明の酸化鉄微粒子は、Ｆｅ２Ｏ３からなる酸化鉄（ヘマタイト）であり、平均粒径が１５０ｎｍ以下のものであることが必要である。平均粒径が１５０ｎｍよりも大きくなると、プリントヘッドからのインクジェットの吐出安定性が悪くなるだけでなく、色調も黒ずんだ色となってマゼンダインクの着色剤として適さなくなる。平均粒径は、好ましくは１２０ｎｍ以下、より好ましくは１００ｎｍ以下、さらに好ましくは８０ｎｍ以下である。ただし、平均粒径は、１０ｎｍ以上であることが好ましい。１０ｎｍ未満になると、黄色味が強くなると共に、均一分散性も悪くなるからである。
The iron oxide fine particles according to the present invention will be described.
The iron oxide fine particles of the present invention are iron oxide (hematite) made of Fe 2 O 3 and have an average particle size of 150 nm or less. When the average particle size is larger than 150 nm, not only the ejection stability of the ink jet from the print head is deteriorated, but the color tone is also darkened and becomes unsuitable as a magenta ink colorant. The average particle size is preferably 120 nm or less, more preferably 100 nm or less, and still more preferably 80 nm or less. However, the average particle size is preferably 10 nm or more. This is because when the thickness is less than 10 nm, the yellowish color becomes stronger and the uniform dispersibility becomes worse.
なお、上記平均粒径は、透過電子顕微鏡で撮影した写真を用いて２００個以上の鉄粉粒子の粒径を測定し、それらの粒径を平均した値を用いるのが好ましい。ただし、粒子形状が不定形や針状の場合には、比表面積を測定し、その比表面積から粒子の形状を球状と仮定して求めた粒径を平均粒径としてもよい。しかし、粒子表面に多数の凹凸があるような場合には、上記透過電子顕微鏡写真から求めた粒径が望ましい。 In addition, it is preferable to use the value which measured the particle diameter of 200 or more iron powder particles using the photograph image | photographed with the transmission electron microscope, and averaged those particle diameters as the said average particle diameter. However, when the particle shape is indefinite or needle-shaped, the specific surface area may be measured, and the particle diameter obtained from the specific surface area assuming that the particle shape is spherical may be used as the average particle diameter. However, when there are many irregularities on the particle surface, the particle size determined from the transmission electron micrograph is desirable.
なお、本発明の酸化鉄微粒子は、粒子の形状が針状である場合には、黄色味が強くまた溶液中の分散性も劣るものとなるため、非針状である球形や立方体状等の粒状であることが好ましい。 In addition, since the iron oxide fine particles of the present invention have a needle shape, the yellowish color is strong and the dispersibility in the solution is inferior. It is preferably granular.
次に、本発明の酸化鉄微粒子は、その酸化鉄Ｆｅ２Ｏ３中のＦｅの一部を、Ｖ，Ｎｂ，Ｔａ，Ｃｒ，Ｍｏ，Ｗ，Ｃｏ，Ｎｉ，ＣｕおよびＡｇの中から選ばれる１種以上の元素で置換したものであることを特徴とする。一般に、酸化鉄を微粒化していくと、黄色味が強くなるが、酸化鉄中のＦｅの一部を、Ｖ，Ｎｂ，Ｔａ，Ｃｒ，Ｍｏ，Ｗ，Ｃｏ，Ｎｉ，ＣｕおよびＡｇ等の元素で置換してやることにより、黄色味が強くなるのを防止することができる。置換する元素は、１種でも２種以上でも構わない。 Next, in the iron oxide fine particles of the present invention, a part of Fe in the iron oxide Fe 2 O 3 is selected from V, Nb, Ta, Cr, Mo, W, Co, Ni, Cu and Ag. It is substituted with one or more elements. Generally, when iron oxide is atomized, the yellow color becomes stronger. However, a part of Fe in iron oxide is replaced with elements such as V, Nb, Ta, Cr, Mo, W, Co, Ni, Cu, and Ag. By substituting with, it is possible to prevent the yellowish color from becoming strong. The element to be substituted may be one type or two or more types.
上記酸化鉄中のＦｅを置換する元素の量は、酸化鉄中のＦｅ原子の０．３〜９ｍｏｌ％の範囲であることが必要である。置換量が０．３ｍｏｌ％よりも少ない場合には、酸化鉄が微粒化するのに伴って黄色味が強くなるのを抑制する効果が充分ではない。逆に、９ｍｏｌ％を超える場合には、色が黒ずんでしまうため好ましくない。また、９ｍｏｌ％を超えると、ヘマタイトへの固溶限界を超えてしまうため、ヘマタイトが単相とならなくなる。上記元素による置換量は、好ましくは０．５〜７ｍｏｌ％、より好ましくは０．７〜５ｍｏｌ％の範囲である。 The amount of the element substituting Fe in the iron oxide needs to be in the range of 0.3 to 9 mol% of Fe atoms in the iron oxide. When the amount of substitution is less than 0.3 mol%, the effect of suppressing the yellowness from becoming stronger as iron oxide atomizes is not sufficient. On the contrary, when it exceeds 9 mol%, the color becomes dark, which is not preferable. On the other hand, if it exceeds 9 mol%, the solid solubility limit in hematite is exceeded, so that the hematite does not become a single phase. The amount of substitution with the above elements is preferably in the range of 0.5 to 7 mol%, more preferably 0.7 to 5 mol%.
また、本発明の酸化鉄微粒子は、インク用溶媒に分散させた時の凝集粒子の最大粒径が２μｍ未満であることが好ましい。２μｍを超えると、プリントヘッドからのインクの吐出安定性が悪くなる傾向があるからである。凝集粒子の最大粒径は、より好ましくは１μｍ以下、さらに好ましくは０．８μｍ以下である。 In the iron oxide fine particles of the present invention, the maximum particle size of the aggregated particles when dispersed in the ink solvent is preferably less than 2 μm. This is because if it exceeds 2 μm, the ejection stability of ink from the print head tends to deteriorate. The maximum particle size of the aggregated particles is more preferably 1 μm or less, and even more preferably 0.8 μm or less.
次に、本発明に係る酸化鉄微粒子の製造方法について説明する。
本発明の酸化鉄微粒子は、噴霧焙焼法、湿式法、水熱法など、一般に知られているヘマタイトの製造方法で製造することができる。原料溶液としては、塩化鉄溶液や硫酸鉄溶液など、酸化鉄を作るのに一般的に用いられている溶液を用いることができる。また、直接ヘマタイトを得る方法以外に、マグネタイトやゲータイト（α−ＦｅＯ（ＯＨ））等、他の形態の鉄酸化物を熱処理してヘマタイトとする方法であっても構わない。さらに、本発明の酸化鉄微粒子は、これらの方法で得られた酸化鉄を、通常公知の方法で粉砕や分級処理し、上述した平均粒径が１５０ｎｍ以下の粒径に調整したものであることが好ましい。
Next, the method for producing fine iron oxide particles according to the present invention will be described.
The iron oxide fine particles of the present invention can be produced by a generally known method for producing hematite, such as a spray roasting method, a wet method, or a hydrothermal method. As the raw material solution, a solution generally used for producing iron oxide, such as an iron chloride solution or an iron sulfate solution, can be used. In addition to the method of directly obtaining hematite, a method of heat-treating other forms of iron oxide such as magnetite or goethite (α-FeO (OH)) to form hematite may be used. Furthermore, the iron oxide fine particles of the present invention are obtained by pulverizing and classifying the iron oxide obtained by these methods by a generally known method to adjust the above-mentioned average particle size to a particle size of 150 nm or less. Is preferred.
本発明の酸化鉄微粒子は、鮮やかなマゼンダ色を示す。また、酸化鉄微粒子は、有機顔料と比較して、耐光性や耐候性に優れている。したがって、本発明の酸化鉄微粒子は、建材等の屋外で使用されるもののインクジェット方式による印刷や塗装に用いるマゼンダ色のインクの着色剤として好適である。なお、上記インクは、本発明の酸化鉄以外に、通常公知の組成物を含むことができ、また、インクの製法も、通常公知の方法を用いることができる。 The iron oxide fine particles of the present invention exhibit a bright magenta color. Moreover, the iron oxide fine particles are excellent in light resistance and weather resistance as compared with organic pigments. Therefore, although the iron oxide fine particles of the present invention are used outdoors such as building materials, they are suitable as a colorant for magenta ink used for printing and painting by an ink jet method. The ink can contain a generally known composition in addition to the iron oxide of the present invention, and a generally known method can also be used as a method for producing the ink.
各種の金属イオンを含む塩化第一鉄溶液または硫酸第一鉄溶液を原料とし、以下に示した湿式法または噴霧焙焼法を用いて、各種の酸化鉄粉を得た。
＜湿式法による酸化鉄粉の製造＞
０．５ｍｏｌ／ｌのＦｅおよびＶ，Ｎｂ，Ｔａ，Ｃｒ，Ｍｏ，Ｗ，Ｃｏ，Ｎｉ，ＣｕおよびＡｇのうちの１種以上を所定量含む塩化第一鉄溶液または硫酸第一鉄溶液に水酸化ナトリウムを加えて中和し、Ｆｅおよび上記金属イオンを含む水酸化鉄溶液を得、次いで、この溶液を温度８０℃、ｐＨ１０に維持しながら空気を吹き込んで酸化し、上記金属を含む鉄酸化物を得た。その後、この鉄酸化物を、脱塩し、ろ過し、乾燥し、解砕して微粉末にし、さらに、大気中で６００℃×２時間の熱処理を施し、表１のＮｏ．１１〜２４に示した上記金属を含む酸化鉄粉を作製した。
＜噴霧焙焼法による酸化鉄粉の製造＞
Ｆｅ濃度が１２０ｇ／ｌで、Ｖ，Ｎｂ，Ｔａ，Ｃｒ，Ｍｏ，Ｗ，Ｃｏ，Ｎｉ，ＣｕおよびＡｇを所定量含む塩化第一鉄溶液を、６００℃の温度で噴霧焙焼して熱分解し、表１のＮｏ．２５〜２８に示した上記金属を含む酸化鉄粉を作製した。
上記のようにして得た表１のＮｏ．１１〜２８に示した各種酸化鉄粉を、さらに振動ボールミルで２０分間粉砕して酸化鉄微粒子とし、以下の評価試験に供した。
Various iron oxide powders were obtained by using a ferrous chloride solution or a ferrous sulfate solution containing various metal ions as a raw material and using the wet method or spray roasting method described below.
<Manufacture of iron oxide powder by wet method>
0.5 mol / l Fe and V, Nb, Ta, Cr, Mo, W, Co, Ni, Cu and Ag are added to a ferrous chloride solution or a ferrous sulfate solution containing a predetermined amount of water. Sodium hydroxide is added to neutralize to obtain an iron hydroxide solution containing Fe and the above metal ions, and then this solution is oxidized by blowing air while maintaining the temperature at 80 ° C. and
<Manufacture of iron oxide powder by spray roasting>
A ferrous chloride solution having a Fe concentration of 120 g / l and containing a predetermined amount of V, Nb, Ta, Cr, Mo, W, Co, Ni, Cu, and Ag is spray roasted at a temperature of 600 ° C. and pyrolyzed. No. 1 in Table 1 The iron oxide powder containing the said metal shown to 25-28 was produced.
No. 1 of Table 1 obtained as described above. The various iron oxide powders shown in 11 to 28 were further pulverized for 20 minutes by a vibration ball mill to form iron oxide fine particles, which were subjected to the following evaluation tests.
また、上記酸化鉄粉の他に、比較材として、市販の塩化鉄系顔料用酸化鉄（Ｎｏ．１）およびその酸化鉄をビーズミルで粉砕し、乾燥したもの（Ｎｏ．２〜５）と、市販の硫酸鉄系顔料用酸化鉄（Ｎｏ．６）およびその酸化鉄をビーズミルで粉砕し、乾燥したもの（Ｎｏ．７〜１０）についても、上記と同様の評価を行った。 In addition to the iron oxide powder, as a comparative material, commercially available iron oxide for iron chloride pigments (No. 1) and the iron oxide pulverized with a bead mill and dried (No. 2 to 5), The same evaluation as above was performed for commercially available iron oxide for iron sulfate pigments (No. 6) and those obtained by pulverizing the iron oxide with a bead mill and drying (No. 7 to 10).
（平均粒径の測定）
透過電子顕微鏡を用いて、酸化鉄の粒子２００個以上について粒径を測定し、その粒径の平均値を求めた。
（凝集粒子の最大径の測定）
レーザー回折式粒度分布測定装置（Ｍｉｃｒｏｔｒａｃ ＨＲＡ；日機装製）を用いて、凝集粒子の最大径を求めた。
（色調評価）
酸化鉄微粒子１ｇにあまに油０．６ｇ加えてフーバー式マラーでペースト化し、これに透明ラッカー１２ｇを加えてから、アプリケーターで厚み０．２ｍｍの塗膜を作製し、日本電色製の色差計を用いて、色調（Ｌ値、ａ値およびｂ値）を測定し、市販の塩化鉄系酸化鉄（比較例１）のＬ値、ａ値およびｂ値を０（基準）とし、これらの値からのずれ（ΔＬ，Δａ，Δｂ）を求めた。なお、マゼンダインクとして好適に用いることができる色調範囲は、ΔＬが０．５〜２．５、Δａが１．０〜６．０、Δｂが０．５〜３．０であり、この範囲内にあるものを色調良（○）、この範囲から外れるものを色調劣（×）と評価した。
（安定吐出性の評価）
各酸化鉄微粒子を用いて実際にインクを作製して、直径２０μｍのプリントヘッドから吐出させ、目詰まりせずに吐出できるかどうかを評価し、目詰まりを起こさない場合を吐出性良（○）、目詰まりを起こさないが吐出むらがある場合を吐出性やや良（△）、目詰まりを起こす場合を吐出性劣（×）と評価した。
(Measurement of average particle size)
Using a transmission electron microscope, the particle size of 200 or more iron oxide particles was measured, and the average value of the particle sizes was determined.
(Measurement of maximum diameter of aggregated particles)
The maximum diameter of the aggregated particles was determined using a laser diffraction particle size distribution analyzer (Microtrac HRA; manufactured by Nikkiso).
(Color evaluation)
Add 0.6 g of oil to 1 g of iron oxide fine particles, paste it with a Hoover type muller, add 12 g of transparent lacquer to it, and then create a 0.2 mm thick coating film with an applicator. The color tone (L value, a value, and b value) was measured, and the L value, a value, and b value of a commercially available iron chloride-based iron oxide (Comparative Example 1) were set to 0 (reference). Deviations from (ΔL, Δa, Δb) were determined. The tone range that can be suitably used as magenta ink is 0.5 to 2.5 for ΔL, 1.0 to 6.0 for Δa, and 0.5 to 3.0 for Δb. The color tone was evaluated as good (◯), and the one out of this range was evaluated as poor color (×).
(Evaluation of stable ejection)
Ink is actually produced using each iron oxide fine particle, ejected from a print head with a diameter of 20 μm, evaluated whether it can be ejected without clogging, and ejection performance is good when clogging does not occur (○) In the case where clogging did not occur but the discharge was uneven, dischargeability was evaluated as slightly good (Δ), and in the case where clogging occurred, dischargeability was evaluated as poor (x).
上記評価結果について、総合評価と共に表１に示した。また、図１に、各酸化鉄微粒子のΔａとΔｂとの関係を示した。
これらの結果から、市販の塩化鉄系酸化鉄（比較例１）は、色がくすんでいて、また、この酸化鉄を微粉砕したもの（比較例２〜５）は、Δｂが大きく（黄色味が強く）、いずれもマゼンダインクに用いる酸化鉄として適さない。さらに、市販の塩化鉄系酸化鉄は、平均粒径が大きい場合には、吐出安定性が劣る。
また、市販の硫酸鉄系酸化鉄（比較例６）およびこれを微粉砕した酸化鉄（比較例７〜１０）は、いずれも鮮やか過ぎて、特に粉砕したものはΔｂも大きく（黄色味が強く）て、いずれもマゼンダインク用の酸化鉄には適さない。
これに対して、本発明に従って、置換金属を適量添加し、平均粒径を適正範囲に制御した酸化鉄微粒子（発明例１〜１５）は、いずれも、比較例１および比較例６の中間に位置している、即ち、適度の鮮やかさを有し、かつ、Δｂが適度に小さく（青みが強く）、マゼンダインクの添加剤に用いて好ましい色調を示している。また、本発明に適合する酸化鉄は、インクの安定吐出性にも優れている。一方、本発明の条件を外れた酸化鉄粉（比較例１１〜１３）は、上記好適範囲から外れたものとなっている。
About the said evaluation result, it showed in Table 1 with comprehensive evaluation. FIG. 1 shows the relationship between Δa and Δb of each iron oxide fine particle.
From these results, commercially available iron chloride-based iron oxide (Comparative Example 1) is dull in color, and those obtained by finely pulverizing this iron oxide (Comparative Examples 2 to 5) have a large Δb (yellowishness). Are not suitable as iron oxides for use in magenta inks. Further, commercially available iron chloride-based iron oxide has poor discharge stability when the average particle size is large.
In addition, commercially available iron sulfate-based iron oxide (Comparative Example 6) and finely pulverized iron oxide (Comparative Examples 7 to 10) are both too vivid, and especially those pulverized have a large Δb (strong yellowishness). Neither is suitable for iron oxide for magenta ink.
On the other hand, in accordance with the present invention, the iron oxide fine particles (Invention Examples 1 to 15), in which an appropriate amount of a substitution metal is added and the average particle diameter is controlled in an appropriate range, are both between Comparative Example 1 and Comparative Example 6. It is located, that is, has a moderate vividness, and Δb is moderately small (strong blueness), and shows a preferable color tone when used as an additive for magenta ink. Further, the iron oxide suitable for the present invention is excellent in stable ink ejection. On the other hand, iron oxide powders (Comparative Examples 11 to 13) that deviate from the conditions of the present invention are out of the preferred range.
本発明の酸化鉄微粒子は、耐光性や耐候性に優れているため、建材分野に限定されるものではなく、屋外で使用されるあらゆるものに用いられるインクジェット用のマゼンダ着色剤として好適に用いることができる。 Since the iron oxide fine particles of the present invention are excellent in light resistance and weather resistance, the iron oxide fine particles are not limited to the field of building materials, and are suitably used as magenta colorants for ink jets used in everything used outdoors. Can do.
Claims (3)
A magenta ink containing the iron oxide fine particles according to claim 1 as a colorant.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012121994A (en) * | 2010-12-08 | 2012-06-28 | Seiko Epson Corp | Inkjet recording ink, deinked pulp, and method for producing thereof |
| JP2015218218A (en) * | 2014-05-15 | 2015-12-07 | 富士フイルム株式会社 | Ink set for building material, image formation method and decorative building material |
| US11584659B2 (en) | 2018-06-21 | 2023-02-21 | Kogakuin University | Iron oxide powder, composition, ceramics, iron oxide powder precursor, method for producing iron oxide powder precursor, and method for producing iron oxide powder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002154826A (en) * | 2000-11-17 | 2002-05-28 | Mitsui Mining & Smelting Co Ltd | Iron oxide particle and manufacturing method therefor |
| JP2005289673A (en) * | 2004-03-31 | 2005-10-20 | Mitsui Mining & Smelting Co Ltd | Magnetite particle and manufacturing method thereof |
| JP2006124547A (en) * | 2004-10-29 | 2006-05-18 | Jfe Chemical Corp | Fine particle of iron oxide for coloring material of ink for inkjet, ink for inkjet, and method for producing ink for inkjet |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002154826A (en) * | 2000-11-17 | 2002-05-28 | Mitsui Mining & Smelting Co Ltd | Iron oxide particle and manufacturing method therefor |
| JP2005289673A (en) * | 2004-03-31 | 2005-10-20 | Mitsui Mining & Smelting Co Ltd | Magnetite particle and manufacturing method thereof |
| JP2006124547A (en) * | 2004-10-29 | 2006-05-18 | Jfe Chemical Corp | Fine particle of iron oxide for coloring material of ink for inkjet, ink for inkjet, and method for producing ink for inkjet |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012121994A (en) * | 2010-12-08 | 2012-06-28 | Seiko Epson Corp | Inkjet recording ink, deinked pulp, and method for producing thereof |
| JP2015218218A (en) * | 2014-05-15 | 2015-12-07 | 富士フイルム株式会社 | Ink set for building material, image formation method and decorative building material |
| US11584659B2 (en) | 2018-06-21 | 2023-02-21 | Kogakuin University | Iron oxide powder, composition, ceramics, iron oxide powder precursor, method for producing iron oxide powder precursor, and method for producing iron oxide powder |
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