# US 2010/0166641 A1 · Titanium dioxide pigment and method for producing the same

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- Number: US 2010/0166641 A1
- Document ID: US20100166641A1
- Status: Published application
- Kind: A1
- Application number: 12/643,384
- Filed: 2009-12-21
- Published: 2010-07-01
- Earliest claimed: 2008-12-25
- Assignees: Sakai Chemical Industry Co., Ltd.
- Inventors: Kazunobu Abe; Kazumi Sugimoto; Atsuki Terabe; Masaru Mikami
- Web page: https://patentgrep.com/patent/US20100166641A1

## CPC

- C09C 1/36: Compounds of titanium {(C09C1/0009, C09C1/0015, C09C1/0078 take precedence)}
- C01G 23/006: {Alkaline earth titanates}
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2004/03: obtained by SEM
- C01P 2004/62: Submicrometer sized, i.e. from 0.1-1 micrometer
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The invention provides a titanium dioxide pigment particle inhibited in photocatalytic activity and reduced in amount of volatile water which has on the surface a composite compound of alkaline earth meta complexed with the titanium dioxide in an amount of 0.1-20% by weight based on the weight of the titanium dioxide pigment particle in terms of oxide of the alkaline earth metal, wherein the composite compound is obtained by heating a compound of at least one of alkaline earth metals selected from magnesium, calcium, barium and strontium and a titanium dioxide particle at a temperature of 60° C. or higher so that the alkaline earth metal is complexed with the titanium dioxide on the surface of the titanium dioxide pigment particle.

## Claims

### Claim 1

A titanium dioxide pigment particle having on the surface a composite compound of alkaline earth metal complexed with the titanium dioxide in an amount of 0.1-20% by weight based on the weight of the titanium dioxide pigment particle in terms of oxide of the alkaline earth metal, wherein the composite compound is obtained by heating a compound of at least one of alkaline earth metals selected from magnesium, calcium, barium and strontium and a titanium dioxide particle at a temperature of 60° C. or higher so that the alkaline earth metal is complexed with the titanium dioxide on the surface of the titanium dioxide pigment particle.

### Claim 2 (depends on 1)

A paint composition comprising the titanium dioxide pigment particle according to claim 1.

### Claim 3 (depends on 1)

A resin composition comprising the titanium dioxide pigment particle according to claim 1.

### Claim 4

A method for producing a titanium dioxide pigment particle which comprises heating a compound of at least one of alkaline earth metals selected from magnesium, calcium, barium and strontium and a titanium dioxide particle at a temperature of 60° C. or higher so that the alkaline earth metal is complexed with the titanium dioxide to form a composite compound on the surface of the titanium dioxide particle in an amount of 0.1-20% by weight based on the weight of the titanium dioxide pigment particle in terms of oxide of the alkaline earth metal.

### Claim 5 (depends on 4)

The method according to claim 4, wherein a dry mixture of a compound of at least one alkaline earth metal and the titanium dioxide particle is heated.

### Claim 6 (depends on 4)

The method according to claim 4, wherein a compound of at least one alkaline earth metal and the titanium dioxide particle are heated in a solvent under ambient pressure.

### Claim 7 (depends on 4)

The method according to claim 4, wherein a compound of at least one alkaline earth metal and the titanium dioxide particle are treated hydrothermally under pressure.