JPS59199530A - Electrically conductive titanium oxide powder of low oxidation state and production thereof - Google Patents

Abstract

PURPOSE:Electrically conductive titanium oxide powder of low oxidation state, having a specified composition, specific resistance and average particle diameter and improved dispersibility in a base material and useful as an electric conductivity imparting agent. CONSTITUTION:Electrically conductive titanium oxide powder of low oxidation state, expressed by the formula TiOx (x is 1.5-1.9), and having <=100OMEGAcm specific resistance and 0.1-1mu average particle diameter. The above-mentioned titanium oxide powder is formed by treating a mixture of (A) titanium dioxide, e.g. a powdery material obtained by decomposing titanium tetrachloride oxidatively in the vapor phase, with (B) a metallic titanium powder having about <=100 mesh particle size at (2.4:1)-(12:1) molar ratio at about 800-1,000 deg.C in an inert atmosphere for 2-5hr, allowing the resultant powdery product to cool to 100 deg.C or below, and pulverizing the resultant cooled product into fine powder.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conductive low-order titanium oxide powder useful as a conductive material and a method for producing the same.

It is known that when titanium oxide is irradiated with ultraviolet rays or heated to high temperatures, it produces lower-order oxides, which tend to take on a grayish-black color and whose electrical conductivity and magnetic susceptibility increase. Recently, attention has been focused on the coloring properties of this low-order titanium oxide, and its use as a black pigment has been proposed, particularly for its application in cosmetics due to its high skin safety.

On the other hand, the use of low-order titanium oxide as an electronically conductive material is attracting attention, and there are many problems that need to be solved for its practical use. When applying low-order titanium oxide as a conductivity-imparting phase, it is necessary to increase the degree of reduction to give it high coloring power, which causes particles to become coarse during the reduction reaction. Low-order titanium oxide powder containing such coarse particles does not have good dispersibility in various conductivity-imparting substrates, and therefore does not provide a sufficient conductivity-imparting effect. A solution is desired.

The present invention solves the above problems by satisfying the T1:0 ratio, specific resistance, and average particle diameter of low-order titanium oxide within specific ranges. The first aspect of the present invention is based on the knowledge that the general formula T
i0x (where x is the degree of oxidation), X power, 5 to 1.9
It has a composition shown by, and a specific resistance of 1. (l OΩcm
The second aspect of the present invention is a conductive low-order titanium oxide powder characterized in that the average particle size is 0.1 to 1 μm, and the second aspect of the present invention is a molar ratio of titanium dioxide and metal titanium of h.2. ,′
I:I-12:I, the mixture is heated in an inert atmosphere, and then ground to form the general formula]"i
('') At X (where X is the degree of oxidation), is 1.,
5 = 1. , 9, and the average grain size is (), J~
This is a method for producing conductive titanium oxide powder, which is characterized in that a powdery product of 1 μm is produced at 10 μm.

The conductive low-order titanium oxide powder of the present invention has good conductive performance and good dispersibility in various conductive materials, and also has good conductive performance in environmental humidity and long-term use. It has excellent features such as being stable against other metals.

The conductive low-order titanium oxide powder of the present invention is a compound having a composition in which Ti:○ is on a specific side, and has a specific resistance and an average particle diameter within a specific range. (a) The ratio of T1:○ is the general formula Ti0x (where X is the degree of oxidation), where X is usually 1.5
~1.9, preferably 1.6-1.8, particularly preferably 1, 6-1. , 7. The conductive lower titanium oxide powder of the present invention having such an oxidation degree range is, for example, l'io, Ti2O3, Ti3O5, Tia (L, T
i3O5,i''; a Ot 1.1' i 701
3. Compounds such as Tl8015, Ti, 0.7, TiHOlg, etc. are substantially mono-primary within the range of the above-mentioned oxidation degree.
It may be the case that the compound exists in a single form, or the case that a plurality of these compounds coexist within the range of the above-mentioned oxidation degree. (1) The specific resistance is usually 1 (H)
Ωcan or less, preferably 5()9 cm or less, particularly preferably 30ΩC+Il or less. Further, (c) the average particle diameter is usually 0.1 to 1μ, preferably 0.2 to 1μ.
The thickness is preferably 0.7μ, 1μ, 0.2 to 0.5μ. In the present invention, the above (a), (1]) and (c)
If it does not satisfy each of the above-mentioned ranges, it is undesirable because properties such as conductive performance and dispersion performance are at least partially lacking.

In order to produce the conductive low-order titanium oxide powder of the present invention, first, (1) titanium dioxide and metallic titanium are mixed in a predetermined manner according to the ratio of 〇 to T of the low-order titanium oxide compound to be produced, heat treatment conditions, etc. Mix in a molar ratio of The mixing molar ratio of the titanium dioxide and metal titanium is usually 2.4:1 to 12:1,
Preferably 3:1 to 6:1, particularly preferably 3.4:1
~4:1 range.

The raw material titanium dioxide to be mixed with the titanium metal described above can be produced by various methods, and examples include the following. (a) Titanium dioxide powder produced by vapor phase oxidative decomposition of titanium tetrachloride (1)
If necessary, an alkaline compound is added to the precipitate of hydrated titanium dioxide obtained by hydrolyzing a titanyl sulfate solution or a titanium tetrachloride solution in the presence of seeds for nucleation to neutralize it. After removing the sulfuric acid groups and chlorine groups occluded in the precipitate and loosening the agglomeration of the precipitate, It is possible to use titanium dioxide powder which is pre-calcined at 550 to 700°C. In some cases, metallic titanium powder can also be directly mixed into the precipitate of hydrated titanium dioxide.

In addition, in order to suppress particle growth and sintering during the reduction reaction and to increase the conductivity of the product, various calcination processing aids such as phosphorus, alkali metals, alkaline earth metals, etc. may be added as necessary. It is also possible to add compounds such as aluminum, silicon, zinc, niobium, tungsten, and tantalum.

I) The amount of the auxiliary agent described in η varies depending on the mixing ratio of titanium dioxide and metal titanium, and the heat treatment conditions, but it is difficult to say more, but it is usually 0 in terms of oxide based on the weight of di-titanium oxide. .1 to 0.5%.

In the method of the present invention, when precalcined hydrated titanium dioxide precipitates are used as described above, or when a calcination aid is used during the reduction reaction, particle growth and particle sintering may be suppressed. Furthermore, since the reduction reaction can be carried out at a relatively low temperature, it is possible to obtain fine particles of conductive low-order titanium oxide powder with more desirable dispersibility and conductivity.

In the method of the present invention, the metallic titanium powder may be either fine powder or powder, and the particle size is usually 100 mesh or less, preferably 200 mesh or less, and particularly preferably 350 mesh or less.

Next, (2), the mixture of titanium oxide and metal titanium obtained in the above (1) is heated at a temperature of usually 800 to 1,000° in an inert atmosphere using a gas flow of nitrogen, argon, helium, etc. C: Desirably carried out at 850 to 900°C. The heating time varies depending on the heating temperature, the mixing ratio of raw materials, the particle size of the raw materials, etc.It is difficult to say, but it is usually 2~
It is 5 hours. The heat treatment may be carried out using various types of heating furnaces, but from an industrial perspective it is preferable to carry out the heat treatment in a rotary furnace under a nitrogen stream. The obtained powdered product is allowed to stand at 1()0°C or lower, preferably at room temperature, in a non-oxidizing atmosphere, and then pulverized by a dry method, a wet method, or a combination thereof to obtain the conductive material of the present invention. The product is made of low titanium oxide powder.

Example 1 Metallic titanium powder (particle size 3
25 mesh (all products, pure) 999, 1% by weight) were homogenized and mixed at a molar ratio of 4=1, and this mixture was charged into the converter and heated in an inert atmosphere of nitrogen gas flow. 85 (,
The powdered product was heated for 3 hours at 'l''('), then cooled to 70°C in the same atmosphere, and then allowed to cool to room temperature in the air. The powder was pulverized with a pulverizer and then pulverized with a pulverizer to obtain the conductive low-order titanium oxide powder of the present invention.

Example 2 In Example 1, rutile-type titanium dioxide powder (average particle size 0.
The conductive low-order titanium oxide powder of the present invention was prepared in the same manner as in the case of the same side, except that 26μ) was used and heated for 3 hours at ≦Joo'c.

Examples 3 to 5/1 In Example 2, except that the mixing ratio of titanium dioxide and metal titanium was changed to the molar ratio shown in Table 1, the treatment of the present invention was carried out in the same manner as in the case of the same side. Conductive low-order titanium oxide powder was obtained.

Table 1 Comparative Example In Example 2, the treatment was carried out in the same manner as on the same side, except that titanium dioxide and metal titanium were mixed at a molar ratio of 2:1.

Example 5 A titanyl sulfate solution was heated and hydrolyzed in the presence of seeds for nucleation. Potassium and thorium carbonate were each used as acidic substances with 0.
The product was pre-calcined at 650'C for 4 hours (open system). The conductive titanium oxide powder of the present invention was prepared in the same manner as in Example 1, except that the obtained fired product was used in place of the titanium dioxide raw material in Example 1.

The composition, resistivity, particle size, and dispersibility of the low titanium oxide powders obtained in the Examples and Comparative Examples described above were measured as follows. The results are shown in Table 2.

Table 2 As is clear from the results in Table 2, the conductive low-order titanium oxide powder of the present invention had good conductivity and good dispersibility.

The specific resistance in Table 2 was measured at a temperature of 20°C and a relative humidity of 50%, or was measured at a constant temperature of 90% relative humidity for the low titanium oxide powder samples of Examples 1 to 5 of the present invention. When measured after being left for a period of time, no effect was observed on any of the samples when j=J.

Compilation: × (degree of oxidation) of T10X in sample powder
The value was determined by chemical analysis. When the sample powders were subjected to X-ray diffraction, it was found that all of them were low-order titanium oxide crystals.

Specific resistance: The sample powder was molded at a pressure of 100 KB/cm" to form a circular powder compact (diameter 18 + n + n, thickness 3
nun), and its DC resistance was measured.

Particle size: Average particle size was measured by electron microphotography.

Dispersibility: The sample powder was mixed with melamine alkyd A4 fat varnish (pigment volume concentration 20%), the mixture was applied to a steel plate panel, and the glossiness (GO'
-60°) was measured and used as an index of dispersibility, and the following A -
D is displayed in four stages. (The higher the gloss, the better the dispersibility) A: Very good dispersibility B: Excellent dispersibility C: Slightly poor dispersibility D Very poor dispersibility.

The conductive low-order titanium oxide powder of the present invention having the characteristics described in Section 111j is suitable for use in a wide variety of fields as a conductive (=I) material.For example, it is suitable for use in a wide variety of fields. It is useful as an antistatic agent for magnetic tapes, paints, etc., and as a conductive material for supports of recording materials such as electrophotography and electrostatic recording. The conductive low-order titanium oxide powder of Example 1 was added in an amount of 3 parts by weight to 100 parts by weight of PVC resin powder.
0 parts by weight was kneaded into a sheet with a thickness of 0.6 mm.

The specific resistance of this sheet was 1.6 x 107 Ωcm, and it was found to have a sufficient antistatic effect for dust-proof flooring, and was comparable to that of conventional electron-conducting conductive oxides. . Further, the conductive low-order titanium oxide powder of Example 1 dispersed in a binder was applied onto a support paper. The surface resistance of the coated surface is 1. ．． 9 x 107 Ω, and the electrophotographic photosensitive material 4.4, which has a photosensitive layer based on titanium dioxide, has better continuous gradation and better image continuity than when conductive zinc oxide is used as a support. Both images were excellent in clarity. Further, the conductive low-order titanium oxide powder of Example 1 was mixed with magnetic iron oxide powder (fuwart-coated γ-F
e203) in a binder (the lower titanium oxide was 2% based on the weight of the iron oxide, and the volume concentration of the filled solids was 50%) was applied to a polyx stell tape. This coating tape has a surface resistance of 3.2X1.09
Ω and an absorbance of 0.295/μ, the magnetic properties were better and the antistatic properties and opacities were comparable to those when carbon black was used as a video magnetic tape. .

Patent Applicant: Ishihara Sangyo Co., Ltd. Procedural Amendments, (Method) % Formula % [0], Case Indication: 1982 Patent Application No. 72032 2
, Title of the invention Conductive low-order titanium oxide powder and its manufacturing method 3, Relationship with the case of the person making the amendment Patent applicant 1] - Location (550) Edobori, Nishi-ku, Osaka-shi, Shimome 3
No. 22・1. Correction σU Order Iyo (=I 1972
July 26, 2016 (shipment date) 5, Amendments Full text of the application and specification 6, Contents of the amendments As attached (as it has been transcribed and there is no change in the written content) Procedural amendments 1980, 8 & 4th Patent Office Commissioner Kazuo Wakasugi1, Case description 1982 Patent Application No. 720322, Title of invention Electrically conductive low-order titanium oxide powder and its manufacturing method 3
, Relationship with the person making the amendment Patent applicant address (3-2 Edobori-chome, Nishi-ku, Osaka 550)
2 No. 11, Daily Amendment Order Self Invention Specification 1, Title of the Invention Conductive low-order titanium oxide powder and method for producing the same 2, Scope (1) of seeking 'l, effect' [5, +' In the formula Ti0x (where X is the degree of oxidation),
is 1.5-1. It has the composition shown in parentheses and has a specific resistance of 1
1. A conductive low-order titanium oxide powder characterized by having a particle diameter of 0.0Ωcm or less and an average particle size of 0.1 to 1μ.

(2) The molar ratio of titanium dioxide and metal titanium is 2.4:
1 to 12:1, the mixture was heat treated in an inert atmosphere, and then ground to give the general formula TiO
Obtain a powdery product having a composition where X is 1.5 to 1.9 in x (where X is the degree of oxidation), has a specific resistance of 400 Ωcm or less, and has an average particle size of 0.1 to 1 μm. A method for producing conductive low-order titanium oxide powder, characterized by:

3. Detailed Description of the Invention The present invention relates to a conductive low-order titanium oxide powder useful as a conductivity-imparting shrine and a method for producing the same.

Titanium dioxide should be heated under ultraviolet rays or at high temperatures [
This produces lower-order oxides, which tend to take on a grayish-black color and are known to have increased electrical conductivity and magnetic susceptibility. Recently, it has been proposed to use low-order titanium oxide as a black pigment due to its coloring properties, particularly in cosmetics due to its high skin safety.

On the other hand, the use of low-order titanium oxide as an electron conductive type conductive material τj is also attracting attention, and there are many problems that need to be solved before its practical application. For example, when the lower titanium oxide for the black pigment is given conductivity,
When used as a coloring agent, it is necessary to reduce the degree of reduction to a relatively high degree in order to obtain high coloring power.
Because of this, particle coarsening and particle sintering are likely to occur during the reduction reaction. The low-order titanium oxide powder containing such coarse particles does not have good dispersibility for various conductivity (=I) effects, and therefore does not have sufficient conductivity (=1) effects. A solution is desired.

The present invention is based on the knowledge that the problems described in i'+ij can be solved by satisfying the T i:o ratio, specific resistance, and average particle diameter of low-order titanium oxide within specific ranges. That is, the first aspect of the present invention is that in the general formula Ti0x (where X is the degree of oxidation), X is 1.5 to 1.
．． It has a composition shown as 9, and has a specific resistance of 1 (1(,1Ω
It is a conductive low-order titanium oxide powder characterized by having Cl+1 or less and an average particle size of 0.1 to 1μ, and the second aspect of the present invention is titanium dioxide and metal titanium in a molar ratio of 2 to 2.
．． = l:1 to 12:1, the mixture is heated in an inert atmosphere, and then ground to obtain the general formula Ti
Powder-like powder having a composition expressed by 5 to 1.9 at 0x (where X is the degree of oxidation), a resistivity of 99cm or less, and an average particle size of 0.1 to 1μ. This is a method for producing a conductive low-order titanium oxide powder, which is characterized in that a product is obtained.

The conductive low-order titanium oxide powder of the present invention has good conductivity and good dispersibility in various conductivity-imparting substrates, and has good conductivity against environmental humidity and long-term use. It has excellent properties such as stability.

The conductive low-order titanium oxide powder of the present invention is a compound consisting of Ti:O in a specific ratio, and has a specific resistance and an average particle size within a specific range. (a) The ratio of l'i:O is in the general formula Ti0x (however, the degree of oxidation), or usually 1
．． 5 to 1.9, preferably 1.6 to 1.8, particularly preferably 1.6 to 1.7. The conductive titanium oxide powder of the present invention having such an oxidation degree range includes, for example, Goio, Tiz○2, Tl309, Ti4O7, T
i , 05.1' i G O11, ]' i 701
3, Tl8015, Ti90. . , 1゛11゜01. Even if compounds such as are present in a substantially single phase within the range of the oxidation degree, or within the range of the oxidation degree (2), those compounds may coexist in multiple phases. (・
This may be the case. (IJ) The specific resistance is usually 1
00ΩCτ0 or less, preferably 50Ωcm or less, particularly preferably 30ΩCl1l or less, and (c) the average particle diameter is usually 0.1 to 1μ, preferably 0.
It is 2-0.7μ, particularly preferably 0.2-0.5μ. In the present invention, if the above-mentioned (a), (b), and (c) do not add at least 714 to each of the above-mentioned ranges, the characteristics such as conductive performance and dispersion performance are at least partially lacking in ν. However, there are visible marks.

In order to produce the conductive low-order titanium oxide powder of the present invention, first, (1) titanium dioxide and metallic titanium are mixed, depending on the Ti:O ratio of the low-order titanium oxide compound to be produced, heat treatment conditions, etc. The mixing molar ratio of the titanium dioxide and metal titanium is usually 2.4:1 to 12:
L is preferably 3:1 to 6:1, particularly preferably 3.4:
It is in the range of 1 to 4:1.

The raw material titanium dioxide to be mixed with the titanium metal may be produced by various methods, including the following. (,) Titanium oxide powder produced by vapor phase oxidative decomposition of titanium tetrachloride, (1)
If necessary, a titanyl sulfate solution or a titanium tetrachloride IB solution is hydrolyzed in the presence of nucleation seeds to precipitate hydrated titanium dioxide, which is then neutralized by adding an alkaline compound as necessary. For example, by peptizing using various peptizing agents such as basic acids and their salts, the sulfate and chlorine groups occluded in the precipitate are removed and the agglomeration of the precipitate is loosened. After that, titanium dioxide powder obtained by pre-calcining at 550 to 7 (months) Celsius is used.

In some cases, metal titanium powder may be directly mixed into the precipitate of water-containing titanium dioxide.

In addition, in order to suppress particle growth and sintering during the reduction reaction and to increase the conductivity of the product, various calcination processing aids, such as phosphorus, alkali metals, alkaline earth It is also possible to add compounds such as metals, aluminum Uno 1, silicon, zinc, diopter, tungsten, and tankle.

1) The amount of the auxiliary agent described in 1j varies depending on the mixing ratio of titanium dioxide and titanium metal and the heat treatment conditions, and is usually 0.1 to 0.1 to oxide based on the weight of titanium dioxide. It is 0.5%.

In the method of the present invention, when precalcined hydrated titanium dioxide precipitates are used as described above, or when a calcination aid is used during the reduction reaction, particle growth and particle sintering may be suppressed. In addition, it is possible to obtain fine particles of conductive low-order titanium oxide powder with more desirable dispersibility and conductive performance by performing a reduction reaction at a relatively low temperature.
I can do that.

In the method of the present invention, the metallic titanium powder may be either fine powder or powder.
The particle size is usually below 00 mesh, preferably below 200 mesh, particularly preferably below 350 mesh.

Next (2), the mixture of titanium oxide and metal titanium obtained in the above (1) is heat-treated in an inert atmosphere using a gas flow of nitrogen, argon, helium, etc., usually for 8 hours.
00~1,000''C desirably 850~900℃
Do it with The heating time depends on the heating temperature, the mixing ratio of raw materials,
It is difficult to say because it depends on the particle size of the raw material, etc., but usually 2
~5 hours. The heat treatment is preferably carried out using various types of heating furnaces, or industrially preferably carried out in a rotary furnace under a nitrogen stream. The obtained powdered product is allowed to cool in a non-oxidizing atmosphere at a temperature below 100°C, preferably at room temperature, and then by a dry method or /+++! The conductive low-order titanium oxide powder product of the present invention is obtained by pulverizing using a formula method or a combination of these methods.

Example 1 Metallic titanium powder (particle size: 325 mesh, regular product, pure) 99.1% by weight) was added to anatase-type titanium dioxide powder (average particle size: 0.15μ) produced by the sulfuric acid method in a molar ratio. -1: Mix uniformly in the 1st bowl and charge this mixture into the same converter in an inert atmosphere of nitrogen gas flow at 85°C.
Heated at 0°C for 3 hours, then cooled the resulting powdered product to 70'C in the same atmosphere, and then allowed to cool to room temperature in the air. Thereafter, this material was pulverized with a sand mill and then pulverized with a pulverizer to obtain a conductive low-order titanium oxide powder of the present invention.

Example 2 In Example 1, rutile-type titanium dioxide powder (average particle size 0.
The conductive low-order titanium oxide powder of the present invention was treated in the same manner as in the same example, except that 26μ) was used and heated at 900° C. for 3 hours.

To Example 3, 4 The conductive material of the present invention was processed in the same manner as in Example 2, except that the mixing ratio of titanium dioxide and metal titanium was changed to the molar ratio shown in Table 1. It also contains low-grade titanium oxide powder.

Table 1 Comparative Example Example 33 was treated in the same manner as in Example 2, except that titanium dioxide and metallic titanium were mixed at a molar ratio of 2:1.

Example 5 Titanyl sulfate) solution H was heated and hydrolyzed in the presence of seeds for nucleation to form hydrated titanium dioxide (peptized particle diameter of about 5 (10A)), and phosphoric acid was added as a calcination aid. , potassium hydroxide and sodium carbonate 12 were added in an amount of 0.2% (calculated as oxides, both based on T i O2 weight), and this was preheated at 650''C for 11 hours; ).The electrically conductive low-order titanium oxide powder of the present invention was produced by the same method as in Example 2, except that the obtained fired product was used in place of the titanium dioxide raw material in Example. Obtained.

The composition, specific resistance, particle size, and dispersibility of the low-order titanium oxide powders used in the Examples and Comparative Examples described in Section 111j were measured using human testimonials. The results are shown in Table 2.

Table 2 As is clear from the results in Table 2, the conductive low-order titanium oxide powder of the present invention had good conductivity and dispersibility.

The specific resistance in Table 2 was measured at a temperature of 20° C. and a relative humidity of 50%, or was measured at a relative humidity of 50% relative humidity for the conductive low-order titanium oxide powder samples of Examples 1 to 5 of the present invention. When measured after being left for a certain period of time in an atmosphere of JO%, almost no effect on humidity changes was observed in either case.

Composition: × (degree of oxidation) of T10X in sample powder
The value was determined by chemical analysis. When the sample powders were subjected to X-ray diffraction, it was found that all of them were low-order titanium oxide crystals.

Specific resistance 2 The sample powder was molded at a pressure of 100 Kg/cqn2 to form a circular powder compact (diameter 1.8111111, thickness 3
III11), and its DC resistance was measured.

Particle size: Average particle size was measured by electron microphotography.

Dispersibility: The sample powder was mixed with melamine alkyd resin varnish (pigment volume concentration 20%), the mixture was applied to a steel plate panel, and the gloss of the dry coating (film thickness 46μ) was (60°-6).
0°) was measured, and the dispersibility index and waist were expressed in four stages, A to D, as shown below. (The higher the gloss, the better the dispersibility) A:
Very good dispersibility ■3 Excellent bidispersity C: Slightly poor dispersibility 1) Very poor bidispersity.

The conductive low-order titanium oxide powder of the present invention having a length of 1 and r in +iii is suitable for use as a conductive oxide 4 in a wide variety of fields. For example, it is useful as an antistatic agent for plastic/lath molded products, films, fibers, magnetic tapes, paints, etc., and as a conductive agent (=j-5) for supports for recording materials such as electrophotography and electrostatic recording. Here are a few specific examples: 30 parts by weight of the conductive low-order titanium oxide powder of Example] was kneaded to a weight of PVC resin (monthly) to a thickness of 0. A sheet l- of 6 +++m was molded.The specific resistance of this sheet was 1..6Xi
O7ΩQ m, which is sufficient for dust-proof floor use.;1
The anti-shock effect was observed, and was comparable to that of conventional electron-conducting conductive oxides. Further, the conductive low-order titanium oxide powder of Example 1 dispersed in bangu was coated on a support paper. The surface resistance of the coated surface is 9 x 107 Ω.
The material is superior in continuous gradation and brightness to images than when conductive zinc oxide is used as a support.
child. Further, the conductive low-order titanium oxide powder of Example 1 was dispersed together with the magnetic iron oxide powder (cobalt-coated 2% based on base wood, filling solids volume concentration 5
0%) was applied onto a polyester tape. This coating tape has a surface resistance of 3.2 x 109Ω and an absorbance (
1,295/μ, and the magnetic properties were better and the antistatic properties and opacities were comparable to those of the case where carbon fluff was used as a video magnetic tape.

Patent applicant: Ishihara Sangyo Co., Ltd.

Claims (2)

[Claims] (1) In the general formula Ti0x (where X is the degree of oxidation)
Power bow, 5~],! An electrically conductive titanium oxide powder having a composition represented by □J, having a specific resistance of 1()0ΩCnl or less, and an average particle size of 0.1 to 1μ. (2) The molar ratio of titanium dioxide and metal titanium is 2.4:
1 to 12:1, the mixture was heat treated in an inert atmosphere, and then ground to give the general formula TiOx
(where X is the degree of oxidation) has a composition of 1.5 to 1.9, has a resistivity of 00 Ωam or less, and has an average particle size of 0.1 to 1μ. A method for producing characteristically conductive titanium oxide powder.