POUDRE DEGRADABLE D'OXYDE DE ZINC ET SON PROCEDE DE PRODUCTION
| N° de brevet: |
EP1892218 (A1) |
| Date de publication: |
2008-02-27 |
| Inventeur(s): |
SHIO SHOICHIRO [JP];ISHIKAWA YUKO [JP];SUDA YUKIMITSU [JP];WADA MASAYOSHI [JP]; |
| Demandeur(s): |
SHISEIDO CO LTD [JP]; |
| Classification: |
C01G9/00; |
| N° de demande: |
EP20060747119 20060602 |
| Numéro(s) de priorité: |
WO2006JP311089 20060602;JP20050163145 20050602;JP20050163146 20050602 |
The method for producing a disintegratable zinc oxide powder of the present invention is characterized by comprising: neutralizing an aqueous solution containing a water-soluble zinc salt and a carboxylic acid or an aqueous solution containing a water-soluble zinc carboxylate with an alkali carbonate to produce precipitate; and firing the precipitate to obtain zinc oxide powder. As a water-soluble zinc salt, zinc chloride or zinc acetate is preferably used. As an acid, acetic acid is preferably used. As an alkali carbonate, sodium carbonate is preferably used. The disintegratable zinc oxide powder has the morphology in which the primary particles of zinc oxide are aggregated to form secondary particles, and these secondary particles are further aggregated to form the zinc oxide powder. The powder can achieve excellent UV protection capability, excellent transparency, and excellent feeling in use through its disintegration. Also, it has good usability and good handling properties.
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