# US 4,391,792 A · Method for obtaining photostable valentinite and valentinite thus obtained

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- Number: US 4,391,792 A
- Document ID: US4391792A
- Status: Granted
- Kind: A
- Application number: 06/292,054
- Filed: 1981-08-12
- Granted: 1983-07-05
- Earliest claimed: 1980-08-12
- Assignees: Bureau de Recherches Geologiques et Minieres
- Inventors: Rene Bloise; Marcel Lorang; Georges Morizot; Genevieve Boissonnade
- Web page: https://patentgrep.com/patent/US4391792A

## CPC

- C01G 30/005: {Oxides}
- C09C 1/0096: {Compounds of antimony (C09C1/0015, C09C1/0078 take precedence)}
- C01P 2002/84: by UV- or VIS- data
- C01P 2004/51: Particles with a specific particle size distribution
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2004/62: Submicrometer sized, i.e. from 0.1-1 micrometer
- C01P 2006/60: Optical properties, e.g. expressed in CIELAB-values
- 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)
- 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}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The invention relates to a process for obtaining photostable valentinite and to valentinite obtained by said process. The process consists in carrying out a basic hydrolysis of antimony trichloride at a temperature comprised between about 80.degree. and 100.degree. C. with a weight ratio of H.sub.2 O/Sb.sub.2 O.sub.3 equal to or greater than about 10. Obtention of photostable valentinite.

## Claims

### Claim 1

Process for the production of photostable valentinite by basic hydrolysis of antimony trichloride, characterized in that it consists in effecting the hydrolysis at a temperature between about 80.degree. and about 100.degree. C. with a weight ratio of H.sub.2 O to Sb.sub.2 O.sub.3 equal to or higher than about 10.

### Claim 2 (depends on 1)

The process of claim 1 characterized in that the hydrolysis is effected under stirring.

### Claim 3 (depends on 2)

The process of claim 2, characterized in that the hydrolysis is carried out with an ammoniacal solution or a solution of sodium hydroxide.

### Claim 4 (depends on 3)

The process of claim 3 characterized in that the antimony trichloride in solution in water is introduced at the same time as the basic solution for the hydrolysis, within a thermostatically controlled reactor and under stirring so as to form a pulp, and in that the pulp is continuously withdrawn at a prescribed rate, and then filtered.