JP4744040B2 - Inorganic oxide spherical particles and method for producing the same - Google Patents
Inorganic oxide spherical particles and method for producing the same Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は、成分の異なる無機酸化物微粒子から構成される無機酸化物球状粒子に関し、更に詳しくは、少なくとも１種類の無機酸化物微粒子を球状粒子の表層部に高含有率で含有している無機酸化物球状粒子に関するものである。
【０００２】
【従来の技術】
無機酸化物微粒子から構成される無機酸化物球状粒子については、すでに公知であり、例えば、特開昭５６−１２０５１１号公報には、シリカ、アルミノシリケートをコアとしてアルミノシリケート化合物をコーティングした微粒子の集塊よりなるアルミノシリケート球状粒子およびその製造方法において、ゲル化させることなしに均一なサイズの微粒子を有するアルミノシリケート水性ゾルを乾燥させて粉末とする製造方法が開示されている。
また、本願出願人は特開平８−５９４０４号公報、特開平８−６７５０５号公報において、抗菌性金属成分を含有する無機酸化物微粒子、その他の無機酸化物微粒子から構成される無機酸化物球状粒子を開示したが、当該無機酸化物球状粒子は前記無機酸化物微粒子の平均粒子径が０．１〜１．０μｍと比較的大きく、かつ、粒子径分布も揃ったものとすることにより、水、有機溶媒等に添加したときに再分散可能な無機酸化物球状粒子を提案したものである。
【０００３】
【発明が解決しようとする課題】
本発明は、平均粒子径と成分が共に異なる無機酸化物微粒子から構成される新規な無機酸化物球状粒子を提供するものであって、無機酸化物微粒子の粒子径の違いによって、該球状粒子中の所定位置における存在割合を異ならしめ、例えば、抗菌性金属成分を含有する無機酸化物微粒子など、特定成分の無機酸化物微粒子を球状粒子の表層部に高含有率で含有させた無機酸化物球状粒子およびその製造方法を提供することを目的とするものである。
【０００４】
【課題を解決するための手段】
本発明に係る無機酸化物球状粒子は、平均粒子径と成分が共に異なる少なくとも２種類の無機酸化物微粒子から構成される無機酸化物球状粒子であって、該球状粒子の表層部における最小の平均粒子径を有する無機酸化物微粒子（ａ）の含有率が、球状粒子の内部における最小の平均粒子径を有する無機酸化物微粒子（ａ）の含有率の２倍以上であることを特徴とする。
前記最小の平均粒子径を有する無機酸化物微粒子（ａ）は、抗菌性金属成分を含有する無機酸化物微粒子であることが好ましい。
本発明に係る無機酸化物球状粒子の製造方法は、平均粒子径と成分が共に異なる少なくとも２種類の無機酸化物微粒子を含有する水懸濁液を噴霧乾燥することを特徴とする。
【０００５】
【発明の実施の形態】
本発明は、平均粒子径と成分が共に異なる少なくとも２種類の無機酸化物微粒子から構成される無機酸化物球状粒子に係る。無機酸化物微粒子を構成する無機酸化物としては、例えば、Ａｌ2 Ｏ3 、ＳｉＯ2 、ＴｉＯ2 、ＺｒＯ2 、Ｆｅ2 Ｏ3 、Ｓｂ2 Ｏ5 、ＷＯ3 、ＺｎＯ、ＭｇＯ、ＣａＯ、ＣｕＯ、などの単体の酸化物や、ＳｉＯ2 −Ａｌ2 Ｏ3 、ＳｉＯ2 −ＴｉＯ2 、ＳｉＯ2 −ＺｒＯ2 、ＴｉＯ2 −Ａｌ2 Ｏ3 、ＳｉＯ2 −Ｂ2 Ｏ3 、ＳｉＯ2 −Ｐ2 Ｏ5 、Ａｌ2 Ｏ3 −Ｐ2 Ｏ5 、ＴｉＯ2 −ＣｅＯ2 、ＴｉＯ2 −ＺｒＯ2 、ＳｎＯ2 −Ｓｂ2 Ｏ5 、ＳｉＯ2 −Ａｌ2 Ｏ3 −ＴｉＯ2 、ＳｉＯ2 −Ａｌ2 Ｏ3 −ＺｒＯ2 、ＳｉＯ2 −ＴｉＯ2 −ＣｅＯ2 、ＳｉＯ2 −Ａｌ2 Ｏ3 −ＭｇＯ、ＳｉＯ2 −Ａｌ2 Ｏ3 −Ａｇ2 Ｏ、ＳｉＯ2 −ＴｉＯ2 −Ｆｅ2 Ｏ3 、ＳｉＯ2 −Ａｌ2 Ｏ3 −ＣａＯ、ＳｉＯ2 −Ａｌ2 Ｏ3 −ＺｎＯ、などの複合酸化物を挙げることができる。
【０００６】
本発明は、無機酸化物球状粒子を構成する最小の平均粒子径を有する無機酸化物微粒子（ａ）の、該球状粒子の表層部における含有率が、球状粒子の内部における含有率の２倍以上であることを特徴とする無機酸化物球状粒子である。本発明において球状粒子の表層部とは、球状粒子の中心を原点０とし、球状粒子の半径（中心から表面までの距離）をｒとすると、球状粒子の（０．９５±０．０３）ｒからｒまでの範囲にある部分を言う。また、球状粒子の内部とは、球状粒子の原点０から（０．９５±０．０３）ｒまでの範囲にある部分を言う。
本発明の無機酸化物球状粒子は、平均粒子径と成分が共に異なる少なくとも２種類の無機酸化物微粒子を含有する水懸濁液を噴霧乾燥して得ることができる。噴霧乾燥は通常の方法、例えば、回転円板方式や加圧ノズルなどの装置を用いて、１００〜数百℃程度の温度で実施することができる。
【０００７】
上記噴霧乾燥により製造された無機酸化物球状粒子は、平均粒子径の小さな無機酸化物微粒子を該球状粒子の表層部に高い割合で含有する。これは、平均粒子径の異なる無機酸化物微粒子が均一に分散した水懸濁液を噴霧乾燥すると、無機酸化物微粒子が寄り集まって球状粒子を形成するが、このとき、粒子径の小さな無機酸化物微粒子は、それより大きな粒子径を有する無機酸化物微粒子の間を通って蒸発水分と共に球状粒子の内部から表層部に移動するからである。
本発明の無機酸化物球状粒子は、一般に触媒や抗菌性粉末など該球状粒子の表層部に機能を持たせることにより効果を発揮する粒子として好適である。例えば、無機酸化物球状粒子を触媒として使用する場合、最小の平均粒子径を有する無機酸化物微粒子（ａ）に触媒活性成分を有する無機酸化物微粒子を用い、該無機酸化物微粒子（ａ）と異なる無機酸化物微粒子（ｂ）に、通常シリカやアルミナなどの触媒担体として使用される無機酸化物微粒子を用いることにより、無機酸化物球状粒子の表層部に触媒活性成分を有する触媒が調製される。
また、無機酸化物球状粒子を抗菌性粉末として使用する場合、最小の平均粒子径を有する無機酸化物微粒子（ａ）に銀、銅、亜鉛、鉛、スズ、ビスマス、カドミウム、クロム、水銀、ニッケル、コバルトなどから選ばれる１種類以上の抗菌性金属成分を含有させた無機酸化物微粒子を用い、さらに該無機酸化物微粒子（ａ）と異なる無機酸化物微粒子（ｂ）を併用することにより、無機酸化物球状粒子の表層部に抗菌活性を有する抗菌性粉末が調製される。上記の中、特に、銀、銅、亜鉛は、抗菌作用、変色および人体に対する安全性などから、抗菌性金属成分として好ましい。
【０００８】
本発明において最小の平均粒子径を有する無機酸化物微粒子（ａ）の平均粒子径は、該無機酸化物微粒子（ａ）と異なる無機酸化物微粒子（ｂ）の平均粒子径の１／１０倍以下、特に、１／５０倍以下であることが好ましい。この値が１／１０倍より大きいと、最小の平均粒子径を有する無機酸化物微粒子（ａ）が該無機酸化物微粒子（ａ）と異なる無機酸化物微粒子（ｂ）の間を通って無機酸化物球状粒子の内部から表層部に移動することができないことがあるからである。
【０００９】
前記最小の平均粒子径を有する無機酸化物微粒子（ａ）は、平均粒子径が０．５〜５００ｎｍの範囲にあり、かつ、粒子径分布が平均粒子径±３０％の粒子径の範囲に占める割合が５０％以上であることが望ましい。また、該無機酸化物微粒子（ａ）と異なる無機酸化物微粒子（ｂ）は、平均粒子径が０．１〜２００μｍの範囲にあり、かつ、粒子径分布が平均粒子径±３０％の粒子径の範囲に占める割合が５０％以上であることが望ましい。
【００１０】
さらに、本発明では前記水懸濁液に含有される最小の平均粒子径を有する無機酸化物微粒子（ａ）が全無機酸化物微粒子に対して０．１〜３０重量％の範囲にあることが好ましい。この値が０．１重量％未満であると、水懸濁液に含有される最小の平均粒子径を有する無機酸化物微粒子（ａ）の粒子数が全無機酸化物微粒子の粒子数に対して少な過ぎて、無機酸化物球状粒子の表層部における最小の平均粒子径を有する無機酸化物微粒子（ａ）の含有率が低くなり、触媒や抗菌性粉末などに用いたとき表層部で十分な活性効果が得られない。一方、前記値が３０重量％より大きいと、水懸濁液に含有される最小の平均粒子径を有する無機酸化物微粒子（ａ）の粒子数が全無機酸化物微粒子の粒子数に対して多過ぎて、無機酸化物球状粒子の表層部および内部に最小の平均粒子径を有する無機酸化物微粒子（ａ）が均一に含有されることとなり、粒子径の違いによる本発明の効果が発現し難い。
【００１１】
【実施例】
以下に実施例を示し本発明を具体的に説明するが、これらに本発明が限定されるものではない。
【００１２】
参考例１
平均粒子径１０ｎｍのチタニアゾル（ＰＷ−１０１０、触媒化成工業（株）製）を固形分量で１０ｇと平均粒子径２μｍのシリカ粉末（アエロジル、日本アエロジル（株）製）を９９０ｇとを水９ｋｇに添加してホモジナイザーにて水懸濁液を作り、噴霧乾燥機（大河原加工社製）で噴霧乾燥（入口２３０℃、出口１４０℃）して、無機酸化物球状粒子（Ａ）を得た。
【００１３】
実施例２
平均粒子径２０ｎｍの銀担持アルミナ含有ゾル（ＡＴＯＭＹＢＡＬＬ−ＵＡ、触媒化成工業（株）製）を固形分量で１０ｇと平均粒子径２μｍのシリカ粉末（アエロジル、日本アエロジル（株）製）を９９０ｇとを水９ｋｇに添加してホモジナイザーにて水懸濁液を作り、噴霧乾燥機（大河原加工社製）で噴霧乾燥（入口２３０℃、出口１４０℃）して、抗菌性無機酸化物球状粒子（Ｂ）を得た。
【００１４】
比較例１
平均粒子径１μｍのアルミナ粉末（ＡＣ−２０、住友化学（株）製）を１０ｇと平均粒子径２μｍのシリカ粉末（アエロジル、日本アエロジル（株）製）を９９０ｇとを水９ｋｇに添加してホモジナイザーにて水懸濁液を作り、噴霧乾燥機（大河原加工社製）で噴霧乾燥（入口２３０℃、出口１４０℃）して、無機酸化物球状粒子（Ｃ）を得た。
【００１５】
比較例２
平均粒子径２μｍの銀担持アルミナ含有粉末（ＡＩＳ−ＮＡＺ３２０、触媒化成工業（株）製）を１０ｇと平均粒子径２μｍのシリカ粉末（アエロジル、日本アエロジル（株）製）を９９０ｇとを水９ｋｇに添加してホモジナイザーにて水懸濁液を作り、噴霧乾燥機（大河原加工社製）で噴霧乾燥（入口２３０℃、出口１４０℃）して、抗菌性無機酸化物球状粒子（Ｄ）を得た。
【００１６】
評価１（無機酸化物球状粒子の組成分析）
参考例１、実施２で得られた無機酸化物球状粒子（Ａ）、（Ｂ）と比較例１、２で得られた無機酸化物球状粒子（Ｃ）、（Ｄ）について、無機酸化物球状粒子の表層部を削って、無機酸化物球状粒子の表層部と内部とに分離し、発光プラズマ分析により組成分析を行った結果を表１に示す。
【００１７】
【表１】
評価２（抗菌性試験）
シェーク法による抗菌性試験を、次のように実施した。
【００１９】
【表２】
【発明の効果】
本発明の無機酸化物球状粒子は、平均粒子径と成分が共に異なる無機酸化物微粒子から構成される新規な無機酸化物球状粒子であって、最小の平均粒子径を有する無機酸化物微粒子（ａ）の含有率が、球状粒子の内部に対して表層部において２倍以上、単位容積当りの最小の平均粒子径を有する無機酸化物微粒子（ａ）の含有率としては、球状粒子の内部に対して１２倍以上が表層部に集中しているので、触媒、抗菌性粉末等、球状粒子の表層部に触媒活性や抗菌活性機能を持たせることにより効果を発揮する粒子として好適である。
本発明の無機酸化物球状粒子の製造方法によれば、前記無機酸化物球状粒子を容易かつ確実に製造することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to inorganic oxide spherical particles composed of inorganic oxide fine particles having different components, and more specifically, an inorganic material containing at least one kind of inorganic oxide fine particles at a high content in the surface layer portion of the spherical particles. It relates to oxide spherical particles.
[0002]
[Prior art]
Inorganic oxide spherical particles composed of inorganic oxide fine particles are already known. For example, JP-A-56-120511 discloses a collection of fine particles coated with an aluminosilicate compound using silica and aluminosilicate as a core. An aluminosilicate spherical particle composed of a lump and a method for producing the same have disclosed a method for producing a powder by drying an aluminosilicate aqueous sol having fine particles of uniform size without gelation.
In addition, the applicant of the present application disclosed in JP-A-8-59404 and JP-A-8-67505, inorganic oxide fine particles containing antibacterial metal components, and inorganic oxide spherical particles composed of other inorganic oxide fine particles. However, the inorganic oxide spherical particles have a relatively large average particle size of the inorganic oxide fine particles of 0.1 to 1.0 μm and a uniform particle size distribution. The present invention proposes inorganic oxide spherical particles which can be redispersed when added to an organic solvent or the like.
[0003]
[Problems to be solved by the invention]
The present invention provides a novel inorganic oxide spherical particle composed of inorganic oxide fine particles having different average particle diameters and different components, and the spherical particle The inorganic oxide spherical shape in which the inorganic oxide fine particles of a specific component, such as inorganic oxide fine particles containing an antibacterial metal component, are contained at a high content in the surface layer of the spherical particles An object of the present invention is to provide particles and a production method thereof.
[0004]
[Means for Solving the Problems]
The inorganic oxide spherical particles according to the present invention are inorganic oxide spherical particles composed of at least two types of inorganic oxide fine particles having different average particle diameters and components, and the minimum average in the surface layer portion of the spherical particles The content of the inorganic oxide fine particles (a) having a particle size is at least twice the content of the inorganic oxide fine particles (a) having the smallest average particle size inside the spherical particles.
The inorganic oxide fine particles (a) having the minimum average particle diameter are preferably inorganic oxide fine particles containing an antibacterial metal component.
The method for producing spherical inorganic oxide particles according to the present invention is characterized by spray-drying an aqueous suspension containing at least two types of inorganic oxide fine particles having different average particle diameters and components.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to inorganic oxide spherical particles composed of at least two types of inorganic oxide fine particles having different average particle sizes and components. Examples of the inorganic oxide constituting the inorganic oxide fine particles include Al 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , Fe 2 O 3 , Sb 2 O 5 , WO 3 , ZnO, MgO, CaO, CuO, A simple oxide such as SiO 2 —Al 2 O 3 , SiO 2 —TiO 2 , SiO 2 —ZrO 2 , TiO 2 —Al 2 O 3 , SiO 2 —B 2 O 3 , SiO 2 —P 2 O 5, Al 2 O 3 -P 2 O 5, TiO 2 -CeO 2, TiO 2 -ZrO 2, SnO 2 -Sb 2 O 5, SiO 2 -Al 2 O 3 -TiO 2, SiO 2 -Al 2 O 3 -ZrO 2, SiO 2 -TiO 2 -CeO 2, SiO 2 -Al 2 O 3 -MgO, SiO 2 -Al 2 O 3 -Ag 2 O, SiO 2 -TiO 2 -Fe 2 O 3, SiO 2 -Al 2 O 3 -CaO, SiO 2 -Al 2 O 3 -ZnO, be mentioned composite oxides such as It can be.
[0006]
In the present invention, the content of the inorganic oxide fine particles (a) having the minimum average particle diameter constituting the inorganic oxide spherical particles in the surface layer portion of the spherical particles is at least twice the content in the spherical particles. It is an inorganic oxide spherical particle characterized by the above. In the present invention, the surface layer portion of the spherical particle means (0.95 ± 0.03) r of the spherical particle, where the origin of the spherical particle is 0 and the radius (distance from the center to the surface) of the spherical particle is r. The part in the range from to r. Further, the inside of the spherical particle means a portion in the range from the origin 0 of the spherical particle to (0.95 ± 0.03) r.
The inorganic oxide spherical particles of the present invention can be obtained by spray drying an aqueous suspension containing at least two types of inorganic oxide fine particles having different average particle diameters and components. The spray drying can be carried out at a temperature of about 100 to several hundred degrees C. using an ordinary method such as a rotating disk system or a pressure nozzle.
[0007]
The inorganic oxide spherical particles produced by spray drying contain inorganic oxide fine particles having a small average particle size in a high proportion in the surface layer portion of the spherical particles. This is because when an aqueous suspension in which inorganic oxide fine particles having different average particle diameters are uniformly dispersed is spray-dried, the inorganic oxide fine particles gather together to form spherical particles. This is because the fine particles move from the inside of the spherical particles to the surface layer portion together with the evaporated water through the inorganic oxide fine particles having a larger particle diameter.
The inorganic oxide spherical particles of the present invention are generally suitable as particles that exert an effect by imparting a function to the surface layer portion of the spherical particles such as a catalyst and an antibacterial powder. For example, when inorganic oxide spherical particles are used as a catalyst, inorganic oxide fine particles having a catalytically active component are used as inorganic oxide fine particles (a) having a minimum average particle diameter, and the inorganic oxide fine particles (a) A catalyst having a catalytically active component in the surface layer part of inorganic oxide spherical particles is prepared by using inorganic oxide fine particles normally used as a catalyst carrier such as silica or alumina for different inorganic oxide fine particles (b). .
When inorganic oxide spherical particles are used as an antibacterial powder, silver, copper, zinc, lead, tin, bismuth, cadmium, chromium, mercury, nickel are added to the inorganic oxide fine particles (a) having the smallest average particle diameter. By using inorganic oxide fine particles containing at least one antibacterial metal component selected from cobalt and the like, and further using inorganic oxide fine particles (b) different from the inorganic oxide fine particles (a) in combination, Antibacterial powder having antibacterial activity is prepared on the surface layer of the oxide spherical particles. Among the above, silver, copper, and zinc are particularly preferable as antibacterial metal components from the viewpoint of antibacterial action, discoloration, safety to human body, and the like.
[0008]
In the present invention, the average particle size of the inorganic oxide fine particles (a) having the smallest average particle size is not more than 1/10 times the average particle size of the inorganic oxide fine particles (b) different from the inorganic oxide fine particles (a). In particular, it is preferably 1/50 times or less. When this value is larger than 1/10 times, the inorganic oxide fine particles (a) having the smallest average particle diameter pass between the inorganic oxide fine particles (a) and the different inorganic oxide fine particles (b), and the inorganic oxide fine particles (a). This is because it may not be possible to move from the inside of the object spherical particles to the surface layer portion.
[0009]
The inorganic oxide fine particles (a) having the minimum average particle size have an average particle size in the range of 0.5 to 500 nm, and the particle size distribution is in the range of the average particle size ± 30%. The ratio is desirably 50% or more. In addition, the inorganic oxide fine particles (b) different from the inorganic oxide fine particles (a) have an average particle size in the range of 0.1 to 200 μm and a particle size distribution with an average particle size of ± 30%. It is desirable that the ratio in the range is 50% or more.
[0010]
Further, in the present invention, the inorganic oxide fine particles (a) having the minimum average particle size contained in the aqueous suspension are in the range of 0.1 to 30% by weight with respect to the total inorganic oxide fine particles. preferable. When this value is less than 0.1% by weight, the number of inorganic oxide fine particles (a) having the minimum average particle size contained in the aqueous suspension is based on the number of all inorganic oxide fine particles. Too little, the content of the inorganic oxide fine particles (a) having the smallest average particle diameter in the surface layer portion of the inorganic oxide spherical particles is low, and the surface layer portion has sufficient activity when used as a catalyst or antibacterial powder. The effect is not obtained. On the other hand, if the value is larger than 30% by weight, the number of inorganic oxide fine particles (a) having the minimum average particle size contained in the aqueous suspension is larger than the number of all inorganic oxide fine particles. Thus, the inorganic oxide fine particles (a) having the smallest average particle size are uniformly contained in the surface layer portion and inside of the inorganic oxide spherical particles, and the effect of the present invention due to the difference in particle size is difficult to be exhibited. .
[0011]
【Example】
EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.
[0012]
Reference example 1
Add 10g of titania sol (PW-1010, produced by Catalyst Kasei Kogyo Co., Ltd.) with an average particle size of 10nm and 990g of silica powder (Aerosil, produced by Nippon Aerosil Co., Ltd.) with an average particle size of 2μm to 9kg of water. Then, a water suspension was made with a homogenizer, and spray dried (inlet 230 ° C., outlet 140 ° C.) with a spray dryer (manufactured by Ogawara Processing Co., Ltd.) to obtain inorganic oxide spherical particles (A).
[0013]
Example 2
10 g of silver-supported alumina-containing sol having an average particle diameter of 20 nm (ATOMYBALL-UA, manufactured by Catalytic Chemical Industry Co., Ltd.) and 990 g of silica powder (Aerosil, manufactured by Nippon Aerosil Co., Ltd.) having an average particle diameter of 2 μm Add water to 9kg, make water suspension with homogenizer, spray dry (inlet 230 ° C, outlet 140 ° C) with spray dryer (made by Ogawara Processing Co., Ltd.), antibacterial inorganic oxide spherical particles (B) Got.
[0014]
Comparative Example 1
Homogenizer by adding 10 g of alumina powder (AC-20, manufactured by Sumitomo Chemical Co., Ltd.) with an average particle size of 1 μm and 990 g of silica powder (Aerosil, manufactured by Nippon Aerosil Co., Ltd.) with an average particle size of 2 μm to 9 kg of water. A water suspension was prepared by spray spray drying (inlet 230 ° C., outlet 140 ° C.) with a spray dryer (manufactured by Ogawara Processing Co., Ltd.) to obtain inorganic oxide spherical particles (C).
[0015]
Comparative Example 2
10 g of silver-supported alumina-containing powder (AIS-NAZ320, produced by Catalyst Kasei Kogyo Co., Ltd.) having an average particle diameter of 2 μm and 990 g of silica powder (Aerosil, Nippon Aerosil Co., Ltd.) having an average particle diameter of 2 μm are added to 9 kg of water. The suspension was added to make a water suspension with a homogenizer, and spray dried (inlet 230 ° C., outlet 140 ° C.) with a spray dryer (manufactured by Ogawara Processing Co., Ltd.) to obtain antibacterial inorganic oxide spherical particles (D) .
[0016]
Evaluation 1 (Composition analysis of inorganic oxide spherical particles)
The inorganic oxide spherical particles (A) and (B) obtained in Reference Example 1 and Example 2 and the inorganic oxide spherical particles (C) and (D) obtained in Comparative Examples 1 and 2 were used. Table 1 shows the results of cutting the surface layer part of the particles to separate the surface part and the inside of the inorganic oxide spherical particles and analyzing the composition by emission plasma analysis.
[0017]
[Table 1]
Evaluation 2 (Antimicrobial test)
The antibacterial test by the shake method was performed as follows.
[0019]
[Table 2]
【The invention's effect】
The inorganic oxide spherical particles of the present invention are novel inorganic oxide spherical particles composed of inorganic oxide fine particles having different average particle sizes and components, and the inorganic oxide fine particles (a ) Content of the inorganic oxide fine particles (a) having a minimum average particle size per unit volume at least twice in the surface layer relative to the inside of the spherical particles. 12 times or more of them are concentrated on the surface layer portion, and therefore, it is suitable as a particle that exhibits an effect by imparting catalytic activity and antibacterial activity function to the surface layer portion of the spherical particle such as a catalyst and antibacterial powder.
According to the method for producing inorganic oxide spherical particles of the present invention, the inorganic oxide spherical particles can be produced easily and reliably.
Claims (4)
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| WO2008081890A1 (en) | 2006-12-28 | 2008-07-10 | Dow Corning Toray Co., Ltd. | Catalyst for dealcoholization condensation reaction and method for producing organopolysiloxane using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS61168503A (en) * | 1985-01-23 | 1986-07-30 | Shokubai Kasei Kogyo Kk | Production of truly spherical fine particle composed of compound inorganic oxide |
| JPS6279841A (en) * | 1985-10-02 | 1987-04-13 | Teikoku Kako Kk | Production of inorganic spherical body |
| JPS6393707A (en) * | 1986-10-08 | 1988-04-25 | Hosokawa Micron Kk | Cosmetic |
| JP2762574B2 (en) * | 1989-06-14 | 1998-06-04 | 東レ株式会社 | Composite particles |
| JP2858022B2 (en) * | 1989-12-12 | 1999-02-17 | 株式会社コーセー | Skin cosmetics |
| KR970000745B1 (en) * | 1993-11-19 | 1997-01-18 | 주식회사 엘지화학 | Coloring material for antibiotic cosmetics, method for their preparation and cosmetic compositions containing coloring material |
| JPH0859404A (en) * | 1994-08-26 | 1996-03-05 | Catalysts & Chem Ind Co Ltd | Antimicrobial inorganic oxide particle |
| JP2704509B2 (en) * | 1995-10-05 | 1998-01-26 | 日本インシュレーション株式会社 | Ultraviolet shielding agent and method for producing the same |
| JP3647527B2 (en) * | 1995-11-13 | 2005-05-11 | 花王株式会社 | Method for producing composite fine particles |
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| WO2008081890A1 (en) | 2006-12-28 | 2008-07-10 | Dow Corning Toray Co., Ltd. | Catalyst for dealcoholization condensation reaction and method for producing organopolysiloxane using the same |
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