WIPO logo
Mobile | Deutsch | Español | Français | 日本語 | 한국어 | Português | Русский | 中文 | العربية |
PATENTSCOPE

Search International and National Patent Collections
World Intellectual Property Organization
Search
 
Browse
 
Translate
 
Options
 
News
 
Login
 
Help
 
Machine translation
1. (WO2007074436) METHODS FOR PRODUCTION OF TITANIUM OXIDE PARTICLES, AND PARTICLES AND PREPARATIONS PRODUCED THEREBY
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2007/074436    International Application No.:    PCT/IL2006/001468
Publication Date: 05.07.2007 International Filing Date: 21.12.2006
IPC:
C01G 23/053 (2006.01), C01G 23/08 (2006.01)
Applicants: JOMA INTERNATIONAL AS [NO/NO]; N-7898 Limingen (NO) (For All Designated States Except US).
VITNER, Asher [IL/IL]; (IL) (For US Only).
EYAL, Aharon [IL/IL]; (IL) (For US Only)
Inventors: VITNER, Asher; (IL).
EYAL, Aharon; (IL)
Agent: WOLFF, BREGMAN AND GOLLER; P.O. Box 1352, 19B Keren Hayesod St., 91013 Jerusalem (IL)
Priority Data:
172,836 27.12.2005 IL
Title (EN) METHODS FOR PRODUCTION OF TITANIUM OXIDE PARTICLES, AND PARTICLES AND PREPARATIONS PRODUCED THEREBY
(FR) PROCEDES DE PRODUCTION DE PARTICULES D'OXYDE DE TITANE, ET PARTICULES ET PREPARATIONS AINSI OBTENUES
Abstract: front page image
(EN)The invention provides a method for the formation of small-size titanium oxide particles, comprising the steps of a) preparing a starting aqueous solution comprising at least one of titanic ions and complexes thereof, at a concentration of at least 0.1 % w/w titanium; b) maintaining the solution at a temperature lower than 70°C for a retention time in which hydrolysis takes place, the extent of the hydrolysis being sufficient to produce O.immol protons per mmol of titanium present in solution, wherein the time does not exceed 14 days, to form a system containing a retained solution; and c) adjusting the conditions in the system by at least one of the steps of: i) heating the retained solution to elevate the temperature thereof by at least 1 °C; ii) changing the pH of the retained solution by at least 0.1 units; and iii) diluting the retained solution by at least 20% whereby there are formed particles, wherein the majority of the particles formed are between about 2nm and about 500nm in size.
(FR)La présente invention concerne un procédé de formation de particules d'oxyde de titane de petites dimensions. Le procédé comporte plusieurs opérations. a) On commence par préparer une solution aqueuse de départ comprenant des ions de titane ou certains de leurs complexes à une concentration massique d'au moins 0,1 % de titane. b) On maintient la solution à une température inférieure à 70 °C le temps nécessaire à la réalisation de l'hydrolyse, l'importance de l'hydrolyse étant suffisante pour produire 0,1 mmol protons par mmol de titane présent dans la solution, cette durée n'excédant pas 14 jours, de façon à former un système contenant la solution retenue. Enfin, c) on règle les conditions dans le système, ce qui nécessite les opérations suivantes. i) On chauffe la solution retenue pour en élever la température d'au moins 1 °C. ii) On modifie le pH de la solution d'au moins 0,1 point. Enfin, iii) on dilue la solution retenue d'au moins 20 %. On obtient ainsi des particules formées, la majorité d'entre elles étant d'un calibre d'environ 2nm à environ 500 nm.
Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LV, LY, MA, MD, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, SV, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LT, LU, LV, MC, NL, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG).
Publication Language: English (EN)
Filing Language: English (EN)