JPH1121125A - Fine thin platy boehmite particles and their production - Google Patents
Fine thin platy boehmite particles and their productionInfo
- Publication number
- JPH1121125A JPH1121125A JP9188903A JP18890397A JPH1121125A JP H1121125 A JPH1121125 A JP H1121125A JP 9188903 A JP9188903 A JP 9188903A JP 18890397 A JP18890397 A JP 18890397A JP H1121125 A JPH1121125 A JP H1121125A
- Authority
- JP
- Japan
- Prior art keywords
- boehmite particles
- mol
- particles
- boehmite
- aluminum hydroxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ゴム・プラスチッ
ク等の各種フィラー及び顔料、塗工材として求められ
る、微細薄肉かつ分散性の良い板状ベーマイト粒子並び
にそれを効率よく製造する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various types of fillers and pigments such as rubber and plastic, and fine and thin plate-like boehmite particles having good dispersibility required as a coating material and a method for efficiently producing the same.
【０００２】[0002]
【従来の技術】バイヤー法によって得られる水酸化アル
ミニウムからアルミナ及びベーマイトを製造する方法と
して、水酸化アルミニウムを大気中で加熱処理する方法
がある。この方法の特徴は安価で大量に製品が出来ると
いう点にある。しかし、製品中には凝集粒子が多く存在
し、粒子形状も不均一である。そこで同じ水酸化アルミ
ニウムを水性スラリーにし、オートクレーブ中で水熱処
理することにより粒子形状の整ったアルミナ及びベーマ
イトが得られている。さらに水熱処理により製造する方
法において、製造された粒子の形状制御を目的とした研
究が行われている。板状ベーマイトの結晶外形を図１に
示す。本発明者等は先に、アルカリ金属の水酸化物を添
加することによりベーマイト粒子は板状になり、厚みの
小さい扁平な粒子を製造し得ることがわかり、特許出願
した（特開平６−２６３４３７）。この発明品は粒子が
並びやすい（配向性が高い）ことを特徴としている。2. Description of the Related Art As a method for producing alumina and boehmite from aluminum hydroxide obtained by the Bayer method, there is a method of heat-treating aluminum hydroxide in the atmosphere. The feature of this method is that a large number of products can be produced at low cost. However, many agglomerated particles are present in the product, and the particle shape is not uniform. Therefore, the same aluminum hydroxide is converted into an aqueous slurry and subjected to hydrothermal treatment in an autoclave to obtain alumina and boehmite with uniform particle shapes. Further, in a method of manufacturing by hydrothermal treatment, research for controlling the shape of manufactured particles has been conducted. FIG. 1 shows the crystal outline of the plate-like boehmite. The present inventors have previously found that by adding an alkali metal hydroxide, the boehmite particles become plate-like and flat particles having a small thickness can be produced, and a patent application has been filed (Japanese Patent Application Laid-Open No. Hei 6-263637). ). The product of the present invention is characterized in that particles are easily arranged (high orientation).
【０００３】各種フィラー、顔料の用途等に板状ベーマ
イト粒子を用いる際には、材料の補強効果及び表面の平
滑性の向上を目的として、配向性が良いうえに微細なも
のが求められることもある。しかし、従来の微細化技術
では板状を保ちながら微細薄肉化しにくく、かかる要請
に対し満足できるベーマイト粒子を提供できなかった。When plate-like boehmite particles are used for various fillers and pigments, fine particles having good orientation are required for the purpose of reinforcing the material and improving the smoothness of the surface. is there. However, the conventional micronization technique has difficulty in achieving a fine and thin wall while maintaining a plate shape, and has not been able to provide boehmite particles satisfying such demands.
【０００４】[0004]
【発明が解決しようとする課題】本発明の目的はベーマ
イト結晶が持つ板状形に着目し、その薄肉な板状形を維
持しながら微細化した粒子を提供し、又、その最適な製
造方法を提供することにある。なお、本発明のベーマイ
ト粒子は、図示された形状に限定されることになる類似
の形態も存在するが、この場合も前記と同様に長径、短
径、アスペクト比、比表面積が特定されるものである。SUMMARY OF THE INVENTION An object of the present invention is to pay attention to the plate-like shape of boehmite crystals, to provide fine particles while maintaining the thin plate-like shape, and to provide an optimum production method thereof. Is to provide. In addition, the boehmite particles of the present invention have a similar form which is limited to the illustrated shape, but also in this case, the major axis, the minor axis, the aspect ratio, and the specific surface area are specified as described above. It is.
【０００５】[0005]
【課題を解決するための手段】本発明は、粒子径（長
径）０．０５〜２μｍ、粒子厚さ０．０１〜０．２μ
ｍ、アスペクト比５以上、比表面積１０〜１００ｍ2／
ｇである微細薄肉板状ベーマイト粒子である。According to the present invention, a particle diameter (major axis) is 0.05 to 2 μm and a particle thickness is 0.01 to 0.2 μm.
m, aspect ratio 5 or more, specific surface area 10 to 100 m 2 /
g of fine thin plate-like boehmite particles.
【０００６】本発明のベーマイト粒子の代表的な形状は
前記図１に示すものであるが、ａ＝０．０５〜２μｍ、
ｃ＝０．０１〜０．２μｍ、アスペクト比≧５で、従来
のものより微細であり、比表面積が１０〜１００ｍ2／
ｇである。本発明においては粒子径とは長径（ａ）を示
し、アスペクト比は短径／粒子厚さ（ｂ／ｃ）を示す。
このような微細なベーマイト粒子は従来なく、ゴム・プ
ラスチック等の各種フィラー及び顔料、塗工材に用いて
分散性が良く、有用なものとなる。特に比表面積１０ｍ
2／ｇ未満では表面の平滑性が求められる所に使用した
場合、粒子が大きすぎて表面に突出したりして平滑性を
低下する恐れがある。又、１００ｍ2／ｇを越えると粒
子の強固な凝集が発生し、単一粒子に分散できなくなる
ので好ましくない。The typical shape of the boehmite particles of the present invention is as shown in FIG. 1, but a = 0.05 to 2 μm,
c = 0.01 to 0.2 μm, aspect ratio ≧ 5, finer than the conventional one, and specific surface area of 10 to 100 m 2 /
g. In the present invention, the particle diameter indicates the major axis (a), and the aspect ratio indicates the minor axis / particle thickness (b / c).
Such fine boehmite particles have never been used before and are useful for various fillers such as rubber and plastics, pigments, and coating materials with good dispersibility. Especially the specific surface area is 10m
If it is less than 2 / g, when used in a place where surface smoothness is required, the particles may be too large and protrude to the surface, resulting in a decrease in smoothness. On the other hand, if it exceeds 100 m 2 / g, strong aggregation of the particles will occur, and it will not be possible to disperse the particles into single particles, which is not preferable.
【０００７】本発明は、水、水酸化アルミニウム又はア
ルミナ水和物にリン酸イオンを含む結晶抑制剤を添加
し、温度１５０〜３５０℃、圧力１０〜１００ｋｇｆ／
ｃｍ2の条件下で水熱合成することを特徴とする微細薄
肉板状ベーマイト粒子の製造方法である。リン酸イオン
を含む結晶抑制剤と共に、アルカリ金属化合物を添加し
てもよい。リン酸イオンの添加量は、水酸化アルミニウ
ム又はアルミナ水和物１モルに対し、１×１０-3〜２×
１０-2モルの範囲が良い。アルカリ金属化合物の添加量
は水酸化アルミニウム又はアルミナ水和物１モルに対
し、３×１０-3〜１×１０-1モルの範囲が良い。According to the present invention, a crystal inhibitor containing a phosphate ion is added to water, aluminum hydroxide or alumina hydrate, and the temperature is 150 to 350 ° C., the pressure is 10 to 100 kgf /
This is a method for producing fine thin plate-like boehmite particles, which is characterized by performing hydrothermal synthesis under the condition of cm 2 . An alkali metal compound may be added together with the crystallization inhibitor containing phosphate ions. The addition amount of phosphate ion is 1 × 10 −3 to 2 × per 1 mol of aluminum hydroxide or alumina hydrate.
A range of 10 -2 mol is good. The addition amount of the alkali metal compound is preferably in the range of 3 × 10 -3 to 1 × 10 -1 mol per 1 mol of aluminum hydroxide or alumina hydrate.
【０００８】本発明において原料である水酸化アルミニ
ウム、アルミナ水和物はとくに限定されるものではな
く、バイヤー法工程より得られた水酸化アルミニウムが
使用できる。原料はあらかじめ粒度調整を行い、平均粒
径にて０．１μｍ〜５．０μｍ好ましくは０．１μｍ〜
２．０μｍにするとよい。原料の微細化は合成後のベー
マイトの微細化につながる。調整方法はボールミル、媒
体撹拌ミル等であるが、これに限定されるものではな
い。In the present invention, the starting materials aluminum hydroxide and alumina hydrate are not particularly limited, and aluminum hydroxide obtained from the Bayer process can be used. The raw material is adjusted in particle size in advance, and has an average particle size of 0.1 μm to 5.0 μm, preferably 0.1 μm to
The thickness may be set to 2.0 μm. Finer raw materials lead to finer boehmite after synthesis. The adjusting method is a ball mill, a medium stirring mill, or the like, but is not limited thereto.
【０００９】本発明による水熱合成処理は上記原料と水
を混合したスラリーを用いる。このスラリーの濃度は１
重量％〜６０重量％好ましくは２０重量％〜５０重量％
である。添加材として用いるリン酸イオンを含む結晶制
御剤にはオルトリン酸以外にメタリン酸、ピロリン酸、
三リン酸、四リン酸も使用できる。又、この中から２種
類以上の添加剤を混合して使用することも可能である。
リン酸の添加量を増やせば増やすほど生成する板状粒子
は微細化する。The hydrothermal synthesis treatment according to the present invention uses a slurry in which the above-mentioned raw materials and water are mixed. The concentration of this slurry is 1
% To 60% by weight, preferably 20% to 50% by weight
It is. In addition to orthophosphoric acid, metaphosphoric acid, pyrophosphoric acid,
Triphosphate and tetraphosphate can also be used. It is also possible to use a mixture of two or more of these additives.
The larger the amount of phosphoric acid added, the finer the plate-like particles formed.
【００１０】リン酸イオンを含む物質は勿論水溶性を示
す化合物でもよく、例えばナトリウム塩、カリウム塩の
様なアルカリ金属塩やアンモニウム塩などのオルトリン
酸塩又はこれらの脱水縮合などによって得られるヘキサ
メタリン酸塩やオルトメタリン酸塩のような各種の縮合
リン酸塩でもかまわない。但し水酸化アルミニウム１ｍ
ｏｌにつきオルトリン酸にて１×１０-3ｍｏｌ以下だと
効果に乏しく、一方、５×１０-2ｍｏｌ以上使用しても
使用量の割には微細化の効果が少なくなるので、好まし
くは１×１０-3〜５×１０-2ｍｏｌ程度の範囲で添加量
を調整するとよい。The substance containing phosphate ions may, of course, be a compound exhibiting water solubility. Various condensed phosphates such as salts and orthometaphosphates may be used. However, aluminum hydroxide 1m
If the amount of orthophosphoric acid is less than 1 × 10 −3 mol per mol, the effect is poor. On the other hand, even if it is used in an amount of 5 × 10 −2 mol or more, the effect of miniaturization is reduced for the amount used. It is advisable to adjust the addition amount in the range of about × 10 −3 to 5 × 10 −2 mol.
【００１１】さらに板状粒子の厚さを薄くし、アスペク
ト比を大きくするにはアルカリ金属の水酸化物を添加す
る。特に水酸化ナトリウム、水酸化カリウムが適当であ
るが必ずしもこれに限られるものではない。アルカリ金
属のリン酸塩として添加することも可能である。反応温
度は１５０℃〜３５０℃であり好ましくは２００℃〜３
００℃である。昇温速度は１００℃／時間〜４００℃／
時間の範囲で行う。合成時間は１０分〜１０時間とす
る。反応時間は合成温度が低いほど長時間を要する。To further reduce the thickness of the plate-like particles and increase the aspect ratio, an alkali metal hydroxide is added. Particularly, sodium hydroxide and potassium hydroxide are suitable, but not necessarily limited thereto. It is also possible to add as a phosphate of an alkali metal. The reaction temperature is 150 ° C to 350 ° C, preferably 200 ° C to 3 ° C.
00 ° C. The heating rate is 100 ° C / hour to 400 ° C /
Perform within a time range. The synthesis time is 10 minutes to 10 hours. The lower the synthesis temperature, the longer the reaction time.
【００１２】合成圧力は１０ｋｇｆ／ｃｍ2〜１００ｋ
ｇｆ／ｃｍ2好ましくは５０ｋｇｆ／ｃｍ2〜７０ｋｇｆ
／ｃｍ2とする。合成温度・圧力の関係はＡｌ2Ｏ3−Ｈ2
Ｏ系状態図でγ−Ａｌ2Ｏ3・Ｈ2Ｏ（ベーマイト）の範
囲でなければならない。合成圧力１０ｋｇｆ／ｃｍ2以
上を要するのは、この範囲を外れた低圧下では形の良い
ベーマイト単結晶を合成できず、生成物が凝集した塊状
の形状を有するからである。また合成圧力１００ｋｇｆ
／ｃｍ2になると粒子は厚肉粗大化の傾向を示すので好
ましくない。The synthetic pressure is 10 kgf / cm 2 -100 k
gf / cm 2, preferably 50 kgf / cm 2 to 70 kgf
/ Cm 2 . The relationship between synthesis temperature and pressure is Al 2 O 3 -H 2
It must be in the range of γ-Al 2 O 3 .H 2 O (boehmite) in the O system phase diagram. The reason why the synthesis pressure is required to be 10 kgf / cm 2 or more is that under a low pressure outside this range, a well-formed boehmite single crystal cannot be synthesized, and the product has an agglomerated lump shape. Also, synthetic pressure 100kgf
/ Cm 2 is not preferred because the particles tend to be thick and coarse.
【００１３】[0013]
【作用】本発明により粒子径（長径）０．０５μｍ〜２
μｍ、粒子厚さ０．０１〜０．２μｍ、アスペクト比５
以上、比表面積１０ｍ2／ｇ〜１００ｍ2／ｇの微細ベー
マイト単結晶（代表的なものとして、結晶形が斜方晶系
で特定の結晶面が平板状に成長した微細な板状粒子）を
提供することが出来る。上記の範囲で原料粒度、添加剤
の添加量を変化させることによって、粒子径及び厚さが
目的とする製品に合わせて細かい範囲で制御できる。According to the present invention, the particle diameter (major diameter) is 0.05 μm to 2 μm.
μm, grain thickness 0.01-0.2 μm, aspect ratio 5
Above, (as a typical, specific fine plate-like particles crystal face grown tabular crystal form in the orthorhombic system) fine boehmite single crystal having a specific surface area of 10m 2 / g~100m 2 / g and Can be provided. By changing the raw material particle size and the amount of additive in the above range, the particle diameter and thickness can be controlled in a fine range according to the target product.
【００１４】[0014]
【発明の実施の形態】以下、本発明を具体的な実施例並
びに比較例によって説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to specific examples and comparative examples.
【００１５】実施例１ 出発原料である水酸化アルミニウムを予めボールミル等
で粉砕し０．７μｍに粒度調整を行った。上記原料と水
を混合し４０重量％のスラリーを作成した後、水酸化ア
ルミニウム１ｍｏｌにつき添加剤としてオルトリン酸を
３×１０-3ｍｏｌ添加した。その後圧力容器に充填し、
昇温速度３００℃／時間で３００℃、２時間保持を行っ
た。容器を冷却後生成物を純水にて洗浄、濾過を行い１
００℃の乾燥器で１２時間乾燥して白色の粉体を得た。
本ベーマイト粉体の粒子形状測定結果は粒子径０．４μ
ｍ、厚さ０．０７μｍになった。Example 1 Aluminum hydroxide as a starting material was previously pulverized with a ball mill or the like to adjust the particle size to 0.7 μm. After mixing the above raw materials and water to prepare a 40% by weight slurry, 3 × 10 −3 mol of orthophosphoric acid was added as an additive per 1 mol of aluminum hydroxide. Then fill the pressure vessel,
The temperature was maintained at 300 ° C. for 2 hours at a rate of 300 ° C./hour. After cooling the vessel, the product was washed with pure water, filtered and
It was dried in a dryer at 00 ° C. for 12 hours to obtain a white powder.
The particle shape measurement result of this boehmite powder is 0.4 μm in particle diameter.
m and a thickness of 0.07 μm.
【００１６】実施例２ 上記実施例１におけるオルトリン酸の添加量を、水酸化
アルミニウム１ｍｏｌにつき８×１０-3ｍｏｌと増量し
て水熱合成を行い、白色の粉体を得た。本ベーマイト粉
体のＳＥＭによる観察結果は図２のようになり、粒子形
状測定結果は粒子径０．２μｍ、厚さ０．０３μｍにな
った。Example 2 The amount of orthophosphoric acid added in Example 1 was increased to 8 × 10 −3 mol per mol of aluminum hydroxide, and hydrothermal synthesis was performed to obtain a white powder. FIG. 2 shows the observation results of the boehmite powder by SEM, and the particle shape measurement results showed that the particle diameter was 0.2 μm and the thickness was 0.03 μm.
【００１７】実施例３ 上記実施例１において添加剤としてオルトリン酸を添加
し、さらに水酸化アルミニウム１ｍｏｌにつき水酸化ナ
トリウムを８×１０-2ｍｏｌ添加して水熱合成を行い、
白色の粉体を得た。本ベーマイト粉体の粒子形状測定結
果は粒子径１．２μｍ、厚さ０．０５μｍになった。Example 3 In Example 1, orthophosphoric acid was added as an additive, and 8 × 10 -2 mol of sodium hydroxide was added per 1 mol of aluminum hydroxide to conduct hydrothermal synthesis.
A white powder was obtained. The particle shape measurement result of this boehmite powder was 1.2 μm in particle diameter and 0.05 μm in thickness.
【００１８】実施例４ 上記実施例３におけるオルトリン酸の添加量を、水酸化
アルミニウム１ｍｏｌにつき８×１０-3ｍｏｌと増量し
て水熱合成を行い、白色の粉体を得た。本ベーマイト粉
体の粒子形状測定結果は粒子径０．５μｍ、厚さ０．０
２μｍになった。Example 4 Hydrothermal synthesis was carried out by increasing the amount of orthophosphoric acid in Example 3 to 8 × 10 −3 mol per mol of aluminum hydroxide to obtain a white powder. The particle shape measurement results of the boehmite powder were as follows: particle diameter 0.5 μm, thickness 0.0
It became 2 μm.
【００１９】比較例１ 上記実施例１，２においてリン酸及び水酸化ナトリウム
無添加のまま水熱合成を行い、白色の粉体を得た。本ベ
ーマイト粉体のＳＥＭによる観察結果は図３の様にな
り、粒子形状測定結果は粒子径０．９μｍ、厚さ０．２
μｍになった。Comparative Example 1 Hydrothermal synthesis was performed in the same manner as in Examples 1 and 2 without adding phosphoric acid and sodium hydroxide to obtain a white powder. The results of observation of the boehmite powder by SEM are as shown in FIG. 3, and the results of particle shape measurement are as follows: particle diameter 0.9 μm, thickness 0.2
μm.
【００２０】比較例２ 上記実施例３，４において水酸化ナトリウムの添加量は
水酸化アルミニウム１ｍｏｌにつきの８×１０-3ｍｏｌ
と変えないで、リン酸無添加にて水熱合成を行い白色の
粉体を得た。本ベーマイト粉体の粒子形状測定結果は粒
子径２．２μｍ、厚さ０．１μｍになった。Comparative Example 2 The amount of sodium hydroxide added in Examples 3 and 4 was 8 × 10 −3 mol per mol of aluminum hydroxide.
The hydrothermal synthesis was performed without adding phosphoric acid to obtain a white powder. The particle shape measurement result of this boehmite powder was 2.2 μm in particle diameter and 0.1 μm in thickness.
【００２１】以上、実施例１〜４、比較例１，２で得ら
れた板状ベーマイト粒子の粒子径及び厚さ、アスペクト
比、ＢＥＴによる比表面積測定結果を表１に示す。リン
酸の効果として特に粒子のアスペクト比を変えずに板状
粒子を微細化できることにある。粒子のアスペクト比を
変えるにはアルカリ金属の水酸化物添加量を調製すれば
よい。なお、オルトリン酸以外のリン酸イオンを含む結
晶抑制剤又は水酸化ナトリウム以外のアルカリ金属化合
物を用いても上記実施例とほぼ同様の結果が得られる。Table 1 shows the results of measurement of the particle size and thickness, aspect ratio, and BET of the plate-like boehmite particles obtained in Examples 1 to 4 and Comparative Examples 1 and 2. The effect of phosphoric acid is that the plate-like particles can be made fine without changing the aspect ratio of the particles. In order to change the aspect ratio of the particles, the amount of the hydroxide of the alkali metal may be adjusted. It should be noted that even when a crystallization inhibitor containing phosphate ions other than orthophosphoric acid or an alkali metal compound other than sodium hydroxide is used, substantially the same results as those in the above-described embodiment can be obtained.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【発明の効果】本発明では粒子径２．０μｍ以下の微細
な板状ベーマイトの粒子形状を細かく制御できる。粒子
形状が１つ１つ均一で、かつ分散性もよいために、配向
性の良いベーマイトが本発明によって高収率で製造する
ことが出来る。そしてかかるベーマイト粒子は各種フィ
ラー及び顔料、塗工材として優れた効果を発揮できる。According to the present invention, the particle shape of fine plate-like boehmite having a particle size of 2.0 μm or less can be finely controlled. Since the particle shapes are uniform one by one and have good dispersibility, boehmite having good orientation can be produced in high yield by the present invention. Such boehmite particles can exhibit excellent effects as various fillers, pigments, and coating materials.
【図１】本発明の対象であるベーマイト粒子の代表的な
形状を表わす模式図である。FIG. 1 is a schematic diagram showing a typical shape of boehmite particles which is an object of the present invention.
【図２】実施例２により得られたベーマイト粒子の電子
顕微鏡写真を示す。FIG. 2 shows an electron micrograph of boehmite particles obtained in Example 2.
【図３】比較例１で得られたベーマイト粒子の電子顕微
鏡写真を示す。FIG. 3 shows an electron micrograph of the boehmite particles obtained in Comparative Example 1.
Claims (5)
厚さ０．０１〜０．２μｍ、アスペクト比５以上、比表
面積１０〜１００ｍ2／ｇである微細薄肉板状ベーマイ
ト粒子。1. Fine and thin plate-like boehmite particles having a particle diameter (major axis) of 0.05 to 2 μm, a particle thickness of 0.01 to 0.2 μm, an aspect ratio of 5 or more, and a specific surface area of 10 to 100 m 2 / g.
にリン酸イオンを含む結晶抑制剤を添加し、温度１５０
〜３５０℃、圧力１０〜１００ｋｇｆ／ｃｍ2の条件下
で水熱合成することを特徴とする微細薄肉板状ベーマイ
ト粒子の製造方法。2. A crystallization inhibitor containing phosphate ions is added to aluminum hydroxide or alumina hydrate, and the temperature is adjusted to 150 ° C.
A method for producing fine and thin plate-like boehmite particles, wherein hydrothermal synthesis is performed at a temperature of 350 to 350 ° C and a pressure of 10 to 100 kgf / cm 2 .
アルカリ金属化合物を添加する請求項２記載の微細薄肉
板状ベーマイト粒子の製造方法。3. A crystallization inhibitor containing phosphate ions,
3. The method for producing fine thin plate-like boehmite particles according to claim 2, wherein an alkali metal compound is added.
ニウム又はアルミナ水和物１モルに対し、１×１０-3〜
２×１０-2モルの範囲とする請求項２又は請求項３記載
の微細薄肉板状ベーマイト粒子の製造方法。4. The addition amount of phosphate ion is 1 × 10 −3 to 1 mol of aluminum hydroxide or alumina hydrate.
The method for producing fine thin plate-like boehmite particles according to claim 2 or 3, wherein the amount is in the range of 2 × 10 -2 mol.
アルミニウム又はアルミナ水和物１モルに対し、３×１
０-3〜１×１０-1モルの範囲とする請求項３記載の微細
薄肉板状ベーマイト粒子の製造方法。5. The amount of the alkali metal compound added is 3 × 1 to 1 mol of aluminum hydroxide or alumina hydrate.
4. The method for producing fine and thin plate-like boehmite particles according to claim 3, wherein the range is from 0 -3 to 1 × 10 -1 mol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9188903A JPH1121125A (en) | 1997-07-01 | 1997-07-01 | Fine thin platy boehmite particles and their production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9188903A JPH1121125A (en) | 1997-07-01 | 1997-07-01 | Fine thin platy boehmite particles and their production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1121125A true JPH1121125A (en) | 1999-01-26 |
Family
ID=16231909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9188903A Pending JPH1121125A (en) | 1997-07-01 | 1997-07-01 | Fine thin platy boehmite particles and their production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1121125A (en) |
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