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1. WO2007074436 - METHODS FOR PRODUCTION OF TITANIUM OXIDE PARTICLES, AND PARTICLES AND PREPARATIONS PRODUCED THEREBY

Publication Number WO/2007/074436
Publication Date 05.07.2007
International Application No. PCT/IL2006/001468
International Filing Date 21.12.2006
IPC
C01G 23/053 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F94
23Compounds of titanium
04Oxides; Hydroxides
047Titanium dioxide
053Producing by wet processes, e.g. hydrolysing titanium salts
C01G 23/08 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F94
23Compounds of titanium
04Oxides; Hydroxides
047Titanium dioxide
08Drying; Calcining
CPC
B82Y 30/00
BPERFORMING OPERATIONS; TRANSPORTING
82NANOTECHNOLOGY
YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
30Nanotechnology for materials or surface science, e.g. nanocomposites
C01G 23/053
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
23Compounds of titanium
04Oxides; Hydroxides
047Titanium dioxide
053Producing by wet processes, e.g. hydrolysing titanium salts
C01G 23/0532
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
23Compounds of titanium
04Oxides; Hydroxides
047Titanium dioxide
053Producing by wet processes, e.g. hydrolysing titanium salts
0532by hydrolysing sulfate-containing salts
C01G 23/0536
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
23Compounds of titanium
04Oxides; Hydroxides
047Titanium dioxide
053Producing by wet processes, e.g. hydrolysing titanium salts
0536by hydrolysing chloride-containing salts
C01G 23/08
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
23Compounds of titanium
04Oxides; Hydroxides
047Titanium dioxide
08Drying; Calcining ; ; After treatment of titanium oxide
C01P 2004/62
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
2004Particle morphology
60Particles characterised by their size
62Submicrometer sized, i.e. from 0.1-1 micrometer
Applicants
  • JOMA INTERNATIONAL AS [NO]/[NO] (AllExceptUS)
  • VITNER, Asher [IL]/[IL] (UsOnly)
  • EYAL, Aharon [IL]/[IL] (UsOnly)
Inventors
  • VITNER, Asher
  • EYAL, Aharon
Agents
  • WOLFF, BREGMAN AND GOLLER
Priority Data
172,83627.12.2005IL
Publication Language English (EN)
Filing Language English (EN)
Designated States
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
(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.
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