JP3418015B2 - Pigment and its production method - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel non-toxic and non-polluting pigment.

[0002]

2. Description of the Related Art In recent years, the use of pigments containing harmful elements such as yellow lead, cadmium yellow, titanium yellow, etc. has been restricted due to the problem of environmental pollution, and a new yellow color that can replace pigments containing these harmful elements. The development of pigments is urgent. Fe ₂ TiO ₅ (pseudobrookite) has been reported as a mineral that exhibits a yellowish brown to reddish brown color and does not contain harmful elements. Suzuki synthesized Fe ₂ TiO ₅ using anatase-type TiO ₂ and α-Fe ₂ O ₃ (hematite) as raw materials,
Although it was reported that e ₂ TiO ₅ started to be generated, it was necessary to heat it to 1200 ° C or higher to complete the reaction, but since Fe ₂ TiO ₅ synthesized at such a high temperature has large particles, It was only inferior in degree, coloring power and hiding power (Fukuji Suzuki, Coloring Material, 57, 1052-1059 (1984)).

Japanese Unexamined Patent Publication No. 50-51128 proposed Fe ₂ TiO ₅ .xTiO ₂ (x = 0 to about 15) as a yellow pigment containing Fe ₂ TiO ₅ . This pigment is a yellow pigment composed of Fe ₂ TiO ₅ and TiO ₂ . In the present invention, the color tone can be adjusted by the mixing ratio of Fe ₂ TiO ₅ and TiO ₂ , and since the hydrous oxide is used as the raw material,
It is characterized in that it can be synthesized at a low temperature of 1100 ° C. and that fine particles of 1 μm or less can be obtained. Further, when it is reacted in a reducing atmosphere, a product with a strong yellowish color is obtained. Even if all the measures are taken, the color tone of the product obtained is only low in color saturation and cannot be used as a substitute for the above pigment. Suyama has TiCl ₄ −FeCl ₃ (or FeCl _3
2 ) system, TiO ₂ by gas phase reaction at 800 to 1250 ° C.
It was synthesized -fe ₂ O ₃ based fine powder, average particle diameter 0.03
Although 0.1 μm powder was obtained, these powders consisted of anatase type TiO ₂ , Fe ₂ TiO ₅ and α-Fe ₂ O ₃ , and their color tone was influenced by the mixture of α-Fe ₂ O _3. It had a strong red tint and could not be used as a yellow pigment (Yoko Suyama,
Akio Kato, Coloring Material, 53, 1035-1043 (1980)).

Only AlFeO ₃ exists as an Al ₂ O ₃ —Fe ₂ O ₃ type compound, and this compound is 1318 to 14 at atmospheric pressure.
It is reported to exist stably in the range of 08 ℃ (Arnu
lf Muan, American Journal of Science, 256, 413-4
22 (1958)). Kaneko, etc., is prepared by adding an aqueous sodium hydroxide solution to a mixed aqueous solution of ferric sulfate and aluminum sulfate.
Ferric hydroxide obtained by neutralizing H in the range of 10 to 12,
Co-precipitate aluminum hydroxide at 350-900 ℃ 5
When heated for a long time, AlFeO ₃ does not form and α-Fe ₂ O ₃ and α-A
It was reported that l ₂ O ₃ was generated (Sumihisa Kaneko, Seishiro Ito, Toshihide Kuwahara, Kinki University, 20th Anniversary Commemorative Papers, 15-21 (1
978)). Only Al ₂ TiO ₅ has been reported as an Al ₂ O ₃ —TiO ₂ -based compound, and this compound has a Fe ₂ TiO ₅ structure, and α-Al ₂ O ₃ and rutile at temperatures lower than 1250 ° C. It is said to decompose into type TiO ₂ . Goldberg also
Al synthesized by heating a coprecipitate obtained by adding ammonia to a mixed aqueous solution of TiCl ₄ and AlCl ₃ to a temperature of 1200 ° C. or higher.
Fe ₂ O ₃ was added to ₂ TiO ₅ to obtain Fe _x Al _2-x TiO _5, and this solid solution was stable at room temperature. (Daniel Goldberg, Rev. Int.
Haut es. Et Refract., 5, 181-194 (1968)). However, the solid solution synthesized by this method was not able to be used as a pigment because sintering proceeded remarkably and was in a condensed state.

Tokunaga et al. Are TiCl ₄ --AlBr ₃ --O ₂ system 800
The gas phase reaction at to 1400 ° C., was synthesized TiO ₂ -Al ₂ O ₃ based fine powder, 1200 ° C. or higher, A in Al ₂ O ₃ about 20 mol% or more
l ₂ TiO ₅ was generated, but this phase was metastable, and α-Al ₂ O ₃ and rutile T were formed at 1100 to 1250 ° C.
It was reported that it was decomposed into iO ₂ (Yukio Tokunaga, Yoko Suyama, Akio Kato, Journal of the Chemical Society of Japan, No. 11, 1758-17102 (1982)).
They make no mention of the Al ₂ TiO ₅ —Fe ₂ TiO ₅ system. In addition, it is known that Fe and Al are solid-dissolved in titanium dioxide (Kiyono Manabu, "Physical Properties and Applications of Titanium Oxide", Kogakudo Shuppan, (1991) pp.96).

[0006]

As described above, although there is an urgent need to develop a new yellow pigment that can replace the yellow pigment containing a harmful element, the development does not proceed slowly and in reality There was a situation in which the use of yellow pigments containing these harmful elements had to be used. In addition, there was no synthesis example of fine particle powder of Fe ₂ TiO ₅ -Al ₂ TiO ₅ based solid solution. An object of the present invention is to provide a novel pigment having excellent pigment characteristics, which can replace the yellow pigment containing the harmful element, and a method for producing the same.

[0007]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have found that Fe ₂ TiO ₅ -Al ₂ TiO ₅ based solid solution fine particle powder has an extremely strong yellow tint and The present invention has been completed by finding that it exhibits a highly yellow color. The present invention is 2
Specific surface area and composition Al _x Fe _{2 -x} TiO _{5 in} the range of up to 15 m ² / g
The present invention provides a pigment having yTiO ₂ (where 0 <x ≦ 1.5, 0 ≦ y). This pigment is Al
_x Fe _2-x TiO ₅ single phase, or composed of Al _x Fe _2-x TiO ₅ and TiO _2. A small amount of Fe and Al may form a solid solution in the TiO ₂ phase. In Al _x Fe _2-x TiO ₅ · yTiO ₂ , the value of x and y
The color tone changes depending on the value of, and when the value of x is increased, the yellowness is strengthened, and when the value of y is increased, the whiteness is high and a pigment having a light color tone is obtained. It should be noted that when Fe is solid-dissolved in TiO ₂ which is a constituent phase, it exhibits a pale yellow color and contributes to the yellow coloration. The specific surface area of the heat-resistant pigment according to the present invention may be within the range of 2 to 15 m ² / g, but more preferably in a range of 3~12m ² / g. The value of x of Al _x Fe _2-x TiO ₅ · yTiO ₂ of the present invention is 0 <x
It may be in the range of ≦ 1.5, more preferably 0.02
≦ x ≦ 1.2, most preferably 0.03 ≦ x ≦ 1.0. That is, when x is smaller than this value, the color tone of the powder is brown and the utility value as a yellow pigment is reduced, which is not preferable, and when it is too large, the refractive index is lowered and thus the coloring power and the hiding power are small. It is not preferable because it becomes a pigment.

Additivity generally holds for the refractive index,
It can be expressed by the following formula. n = 1 + ρΣPiKi ρ: Density Pi: Weight fraction of i-th component Ki: Weight refractive index of i-th component For each component of the pigment of the present invention, each data is as follows. N _D rutile type TiO ₂ 2.72 anatase type TiO ₂ 2.52 α-Al ₂ O ₃ 1.77 α-Fe ₂ O ₃ 3.08 having a refractive index at 589 nm Weight refractive index TiO ₂ 0.40 Al ₂ O ₃ 0.20 Fe ₂ O ₃ 0.39 Although the weight refractive index of Fe ₂ O ₃ is not described in the literature, it was calculated from the refractive index and density of α-Fe ₂ O ₃ . Using the above data, the refractive index of Fe ₂ TiO ₅ and Al ₂ TiO ₅ was calculated by the above equation, and the following results were obtained. Fe ₂ TiO ₅ 2.73 (ρ = 4.4) Al ₂ TiO ₅ 2.07 (ρ = 3.7) The pigment of the present invention has a refractive index calculated based on the above equation using the above numerical values. When it does, it is desirable to have a refractive index of 2.3 or more, preferably 2.4 or more.

The value of y may be 0 or more, preferably 0≤y≤10, more preferably 0≤y≤7. In this range, a pigment having more excellent saturation can be obtained.
The pigment of the present invention is characterized by being non-toxic and non-polluting and excellent in heat resistance, but since it has few sintered particles, it is also excellent in dispersibility and dispersion stability in water, so that it is soluble in various waters. Can be easily made into paint by mixing with resin. The average particle size of the pigment according to the present invention is preferably 1 μm or less, more preferably 0.1-1.0 μm, most preferably 0.2-m.
It is 0.7 μm. The particle size can be determined by dispersing the pigment in water and measuring with a particle size meter. The particle shape of the pigment according to the present invention is granular or columnar. When the salt produced by neutralization is baked without washing after the formation of the hydrous oxide, it tends to have a columnar shape.

The pigment according to the present invention has excellent heat resistance, for example, an organic plastic (polyvinyl chloride, polyethylene, polystyrene, etc.) which is treated at a temperature of about 200 ° C. or higher, or up to a temperature of 500 ° C. or higher. It can be used in the production of inorganic glazes for heated enamel, ceramics, ceramic agglomerates or concrete roof tile granules.

The pigment according to the present invention is typically manufactured by the following method. That is, a titania sol obtained by washing and deflocculating an aggregated precipitate produced by hydrolyzing an aqueous solution of titanyl sulfate by heating or a titania sol obtained by deflocculating an aqueous hydrochloric acid-acidic solution of titanium after heating and hydrolyzing the same is dissolved in water-soluble iron. After adding the compound and the water-soluble aluminum compound,
After neutralization by adding an alkali, filtration, washing, drying and baking may be performed. The titania fine particles, which are components of the titania sol, mean hydrous titanium oxide, and in the present invention, those having an amorphous structure or those having anatase type and rutile type structures are used. The titania sol from the aggregated precipitate produced by hydrolyzing the titanyl sulfate aqueous solution by heating is made into a slurry after washing the aggregated precipitate, neutralized with an alkali such as aqueous sodium hydroxide solution or ammonia water, filtered, and washed. To remove sulfate radicals, and subsequently to form a slurry, and add a monobasic acid such as hydrochloric acid or nitric acid to adjust the pH of the slurry to 3 or less,
It is preferably obtained by adjusting to 2-1 and peptizing. Further, the titania sol from the aggregated precipitate produced by hydrolyzing the hydrochloric acid acidic aqueous solution of titanium is filtered, washed, and then slurried, and a monobasic acid such as hydrochloric acid or nitric acid is added,
It can be obtained by adjusting the pH of the slurry to 3 or less, preferably 2-1.

The aggregated precipitate of hydrous titanium oxide obtained by hydrolyzing an aqueous solution of titanyl sulfate or an aqueous solution of titanium with hydrochloric acid may be used as it is as a TiO ₂ source, but it is excellent in dispersibility and has a clear color tone. It is preferable to use titania sol as the TiO ₂ source in order to obtain the yellow pigment powder.
In particular, when titanium oxide hydrous of a titanyl sulfate source is used as a TiO ₂ source, α-Fe is affected by the effect of SO ₃ contained in the hydrous titanium oxide.
_{Since 2} O ₃ remains in the pigment powder and a reddish pigment powder is easily obtained, it is desirable to remove SO ₃ by washing in advance. Water-soluble iron compounds include ferric chloride and ferric chloride.
Iron, ferric nitrate, ferrous nitrate, etc. can be used. Sulfates can be used without problems if x and y are large in the Al _x Fe _{2 -x} TiO ₅ · yTiO ₂ formula and Fe content is small, but generally α-Fe ₂ O ₃ remains As a result, a pigment powder having a strong redness tends to be obtained, and therefore it is preferable not to use. Further, when using the ferrous salt, it is necessary to perform firing in an oxidizing atmosphere. As the water-soluble aluminum compound, aluminum chloride, polyaluminum chloride,
Aluminum nitrate, sodium aluminate, etc. can be used. Aluminum sulfate is preferably not used for the same reason as the Fe ₂ O ₃ source.

Slurry for neutralizing by adding alkali
The pH is preferably in the range of 8-10. That is, in a region lower than this range, a pigment powder having a strong reddishness tends to be obtained due to the incorporation of α-Fe ₂ O _{3, and in} a region higher than this range, the solubility of aluminium becomes large, which is not preferable. The slurry obtained by neutralization may be spray-dried, or may be washed and dried after solid-liquid separation by filtration. A firing temperature of 800 to 1100 ° C is suitable. That is, if the temperature is lower than this, it takes a long time to complete the reaction, which is not preferable, and if the temperature is higher, the particles are more likely to be sintered and the dispersibility is poor and a pigment powder having an unclear color tone is easily obtained.
Incidentally, the above-mentioned water-soluble iron compound and water-soluble aluminum are added to and mixed with an acidic aqueous hydrochloric acid solution of titanium to obtain an acidic aqueous solution of titanium, iron and aluminum, and an alkali is added to this to obtain a hydrous oxide obtained by neutralization. 800 ~ 1100 ℃
The method of firing at is also effective.

Furthermore, the present invention provides a coating layer on the surface of the particles, preferably at least one hydroxide-containing coating layer selected from the group consisting of silicon hydrous oxide and aluminum hydrous oxide. Provide a pigment. The pigment of the present invention is excellent in water dispersibility, but with respect to dispersibility and dispersion stability in a coating material, compatibility with a dispersion medium resin resin or solvent becomes a problem, and dispersion stability may vary depending on the type of resin or solvent. May cause problems. In such a case, it is preferable to coat the surface of the particles with a hydrous oxide of silicon or aluminum by a known method to improve the familiarity. Since the pigment of the present invention is excellent in water dispersibility, such coating treatment is effectively utilized. Type of coating,
The amount used is not particularly limited and can be appropriately selected and treated according to the type of resin or solvent used. For example, the treatment with the hydrous oxide of silicon and / or aluminum described above may be performed, or the hydrous oxide of tin and / or the hydrous oxide of zirconium may be coated on the innermost layer, and then the hydrous oxide of silicon may be added. Covering the intermediate layer,
Finally, it may be coated with a hydrous oxide of aluminum. In addition, it may be coated with a hydrous oxide such as titanium, cerium or zinc. Further, known organic coating materials such as aluminum stearate, dodecylbenzene sulfonic acid, surfactants such as alkanolamines, polyhydric alcohols, organosiloxane compounds, silane-based, titanium-based and aluminum-based cups. A ring agent or the like can also be used. Generally, a treatment with a hydrous oxide of silicon and / or aluminum is preferably performed. When treating with hydrous oxides of silicon and aluminum, S
Converted to iO ₂ and Al ₂ O ₃ , 1-2 for TiO ₂ , respectively
0 wt% is suitable. If the amount of treatment is too large, the dispersibility will be reduced.

This coating treatment can be performed by a known method. For example, when treating with a hydrous oxide of silicon and / or aluminum, the Al _x Fe _2-x TiO ₅ phase or the Al _x Fe _2-x TiO ₅ phase obtained in the above firing step and Fe, Al
A solid solution titanium dioxide pigment is used as TiO _{2 in an amount} of 50 to ₂
An aqueous slurry is prepared by dispersing in water to a concentration of 50 g / liter, preferably 120 to 200 g / liter, and a water-soluble silicon and / or aluminum compound, preferably a hydrous oxide of silicon and / or Alternatively, neutralization may be carried out after addition of aluminum hydrous oxide in an amount such that the coated amount of SiO ₂ and Al ₂ O ₃ with respect to the calcined product is 1 to 20% by weight, respectively. For example, when sodium silicate is used as the water-soluble silicate, acids such as sulfuric acid, nitric acid and hydrochloric acid are added to the above aqueous slurry to adjust the pH of the slurry to 7. When aluminum sulfate is used as the water-soluble aluminum compound, the pH of the aqueous slurry in which the pigment particles are dispersed is adjusted to 7 by adding an alkali such as sodium hydroxide or potassium hydroxide.

Further, treatment methods using various inorganic / organic coating materials are known, and treatment can be carried out by an appropriate method if necessary. Incidentally, titanium compounds produced using ores such as naturally occurring rutile type titanium oxide and ilmenite as a TiO ₂ source contain various impurities derived from ores such as niobium and tantalum, and some of them are Although it remains in the pigment, the effect on the color tone is slight and there is no problem. The pigment according to the present invention can be used in all fields known as a non-toxic and non-polluting yellow pigment, and is used as a coloring material for thermoplastic resins, thermosetting resins, traffic paints for wear, enamel, ceramics, glazes and the like. Particularly preferably used. Hereinafter, the present invention will be described in more detail with reference to examples. The following examples are given for illustrative purposes only and the scope of the invention is not limited thereby.

Examples 1 to 10 TiO _{2 (} 120 g / liter) of titania sol (3 liters), Fe ₂ O _{3 (} 260 g / liter) ferric chloride aqueous solution and Al ₂ O _{3 (} 120 g / liter polyaluminum chloride aqueous solution) were prepared. After adding an amount corresponding to the composition shown in 1 above, 200 g / liter of sodium hydroxide aqueous solution was added dropwise to adjust the pH of the slurry to 9.0,
Stirring was continued for 1 hour. After filtration and washing, it was dried at 110 ° C. Put the dried product in an alumina crucible and insert it in an electric furnace.
After the temperature was raised to 950 ° C. at a rate of 200 ° C./hour, the temperature was maintained for 1 hour. After the temperature was lowered to 200 ° C. at a rate of 250 ° C./hour, the fired product was taken out from the electric furnace. After being crushed with an Ishikawa type crusher, the color tone of the sample pressure-molded at a pressure of 935 Kg / cm ² was measured by a color tester SC-2-CH manufactured by Suga Test Instruments Co., Ltd. Table 1 shows the colorimetric values. In addition, the measured value of the specific surface area by the BET method is also shown in this table.

[0018]

[Table 1]

Comparative Examples 1 to 5 To 3 liters of titania sol of 120 g / liter as TiO ₂ , 210 g / liter of ferric chloride aqueous solution as Fe ₂ O ₃ was added in an amount corresponding to the composition shown in Table 2, and then 200
The pH of the slurry was adjusted to 9.0 by dropwise addition of a g / liter aqueous sodium hydroxide solution, and stirring was continued for 1 hour. After filtration and washing, it was dried at 110 ° C. The dried product was placed in an alumina crucible, inserted into an electric furnace, heated to 950 ° C. at a rate of 200 ° C./hour, and then kept at the temperature for 1 hour. After the temperature was lowered to 200 ° C. at a rate of 250 ° C./hour, the fired product was taken out from the electric furnace. The color tone of the pressure-molded product and the BET specific surface area of the powder were measured under the same conditions as in Examples 1 to 10. The results are shown in Table 2.

[0020]

[Table 2]

When the products of Examples and Comparative Examples were examined by powder X-ray diffraction, the diffraction line of the pseudo-brookite phase of the Example was on the higher angle side than the diffraction line of the pseudo-brookite phase of the Comparative Example. It was transitioning. For example, the (230) lattice spacing d of the pseudo-brookite phase of Example 2 is 2.
721 angstroms, that of Comparative Example 1 is 2.
It was 749 angstroms. It is considered that this is because Al ^{3+, which} has a smaller ionic radius than Fe ³⁺ , was substituted and dissolved in the crystal lattice of pseudobrookite. The sample of the comparative example was composed of the pseudo-brookite phase and the rutile TiO ₂ phase, but the sample of the example was the pseudo-brookite phase,
Rutile TiO ₂ phase and anatase - was composed of peptidase type TiO ₂ phase. Products of Examples 1 to 10 and ABS manufactured by Ube Cycon
The resin Psycholac UT-30 was kneaded at 280 ° C. using a two-axis two-vent type extruder manufactured by Nakatani Machine, and then injection-molded at the same temperature by a vertical injection molding machine SAV-30-30 manufactured by Yamashiro Seiki. When the test piece was manufactured by changing the residence time in the injection tester to 5 to 60 minutes and the color tone was examined, it was found that there was no significant difference in the color tone of the test piece and there was no problem in heat resistance. It was

Examples 11 to 12 In 3 liters of titania sol of 100 g / liter as TiO ₂ , 260 g / liter of ferrous chloride aqueous solution as Fe ₂ O ₃ and 80 g / liter of aluminum nitrate aqueous solution as Al ₂ O ₃ are shown in Table 3. After adding an amount corresponding to the composition shown in 2
A pH of the slurry was adjusted to 9.5 by dropping an aqueous solution of sodium hydroxide (00 g / liter), and stirring was continued for 1 hour. After filtration and washing, it was dried at 110 ° C. The dried material was placed in an alumina crucible, inserted into an electric furnace, heated to 900 ° C. at a rate of 200 ° C./hour, and then kept at the temperature for 1 hour. After cooling down to 200 ° C at a rate of 250 ° C / hour,
The fired product was taken out from the electric furnace. The color tone of the pressure-molded product and the BET specific surface area of the powder were measured under the same conditions as in Examples 1 to 10. The results are shown in Table 3.

[0023]

[Table 3]

The sample of Example 11 was composed of two phases, a pseudo-brookite phase and a rutile type TiO ₂ phase.

Example 13 200 g of the calcined powder obtained in Example 2 was made into an aqueous slurry of 150 g / liter, 130 ml of a 200 g / liter aqueous solution of sodium aluminate as Al ₂ O ₃ was added, and then hydrochloric acid was added dropwise. The pH of the slurry was adjusted to 6.5. It was filtered, washed and dried at 110 ° C. The particle size of the pigment obtained is SK LASER MICRON manufactured by Seishin Enterprise Co., Ltd.
When measured by SIZER PRO-7000S, it was 0.25 μm. The pigments obtained were blended in the following proportions. Powder 8.0 g Oil-free alkyd 40.0 g (M-6401 manufactured by Dainippon Ink and Chemicals Inc.) Toluene / Butyl acetate (1/1) 4.0 ml 3mmφ alumina beads 60.0 g are used and a paint conditioner manufactured by Red Devil Co. To disperse the alkyd paint, and the particles in the paint at each dispersion time were examined every 5 minutes with a grind gauge. The dispersion time until it became 10 μm or less was 15 to 20 minutes, and the dispersibility was excellent.

Example 14 300 g of the calcined powder obtained in Example 2 was made into a 250 g / liter aqueous slurry, and 280 ml of an 85 g / liter sodium silicate aqueous solution as SiO ₂ was added.
Further, 240 ml of 107 g / liter aluminum sulfate aqueous solution was added as Al ₂ O ₃ . An aqueous sodium hydroxide solution was added dropwise to the slurry to adjust the pH to 7.0. It was filtered, washed and dried at 110 ° C. The particle size of the obtained pigment is SK LASER MICRON SIZER PR manufactured by Seishin Enterprise Co., Ltd.
When measured by O-7000S, it was 0.34 μm. The pigments obtained were blended in the following proportions. Powder 5.82g Nitrocellulose solvent 22.1g Solvent 10.1g DBP 1.9g Nitrocellulose solvent is a weight ratio of nitrocellulose:
Butyl acetate: Ethyl acetate: Ethyl cellosolve: Toluene = 10: 8: 5: 4: 6 mixed solvent, the solvent is parts by weight of butyl acetate: ethyl acetate: ethyl cellosolve: toluene = 8: 5: 4: 6. It is a mixed solvent. 80 ml mayonnaise bottle with the above mixture and 3 mmφ alumina beads 6
Add 5.0 g and disperse with a paint conditioner manufactured by Red Devil to prepare a nitrocellulose paint,
The particles in the paint at each dispersion time were examined every 5 minutes with a grind gauge. Dispersion time to reach 10 μm or less is 1
It was 5 to 20 minutes and was excellent in dispersibility.

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) C01G 49/00-49/08 C01G 23/00-23/08 C09C 1/00-3/12

Claims (7)

(57) [Claims] 1. A specific surface area of ² to 15 m ² / g and a composition of Al _x Fe _{2 -x} TiO ₅ .yTiO ₂ (where 0 <x ≦ 1.5, 0 ≦
A pigment having y). 2. The pigment according to claim 1, which has a coating layer on the surface of the particles. 3. The pigment according to claim 1, which has a coating layer of at least one kind of hydrous oxide selected from the group consisting of hydrous oxides of silicon and hydrous oxide of aluminum on the surface of particles. 4. A specific surface area of ² to 15 m ² / g and a composition of Al _x Fe _{2 -x} TiO ₅ .yTiO ₂ (where 0 <x ≦ 1.5, 0 ≦
a pigment having y) and a refractive index of 2.3 or more. 5. A water-soluble iron compound and a water-soluble aluminum compound are added to a dispersion slurry of hydrous titanium oxide, an alkali is added to neutralize the slurry, and after filtration, washing and drying,
The method for producing a pigment according to claim 1, wherein the pigment is baked at 800 to 1100 ° C. 6. After adding a water-soluble iron compound and a water-soluble aluminum compound to a dispersion slurry of hydrous titanium oxide, an alkali is added to neutralize the slurry, and after filtration, washing and drying,
After firing at 800 to 1100 ° C., the fired product is dispersed in water to form an aqueous slurry, and at least one compound selected from the group consisting of water-soluble silicon compounds and aluminum compounds is added to the slurry. Neutralization is carried out, The manufacturing method of the pigment of Claim 3 characterized by the above-mentioned. 7. A coating material and a resin composition comprising the pigment according to claim 1.