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Sphaerische oxidische Partikel und deren Verwendung

Spherical oxide particles, used e.g. as x-ray-opaque dental filler, contrast agent, catalyst, tracer or in nuclear magnetic resonance or electro-optical device, contain lanthanide and titanium, zirconium, aluminum, yttrium or silicon oxides.
: Gellermann, C.; Wolter, H.

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DE 2000-10018405 A: 20000413
DE 2000-10018405 A: 20000413
EP 2001-109140 A: 20010412
DE 10018405 B4: 20040708
EP 1146072 A1: 20011017
Patent, Elektronische Publikation
Fraunhofer ISC ()

(A1) Die Erfindung betrifft sphaerische oxidische Partikel mit einer Partikelgroesse von 5 bis 10000 nm, enthaltend 0,1 bis 99,9 Gew.-% einer ersten oxidischen Verbindung, ausgewaehlt aus Titan, Zirkon, Aluminium, Yttrium und Silicium und mindestens ein weiteres Oxid der Lanthanoide.


EP 1146072 A UPAB: 20020123 NOVELTY - Spherical oxide particles with a particle size of 5-10000 nm contain 0.1-99.9 wt.% first oxide (I) of titanium (Ti), zirconium (Zr), aluminum (Al), yttrium (Y) or silicon (Si) and other lanthanide (Ln) oxide(s) (II). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the production of these particles. USE - The particles are used as fillers for medical purposes, e.g. as x-ray-opaque dental fillers; as x-ray opaque carriers for medical applications, contrast agent, catalyst and nuclear magnetic resonance (NMR) and tracer reagents; and in optical, electrical or electro-optical devices (all claimed). ADVANTAGE - Particles used as fillers in certain applications, e.g. for medical purposes, must have a narrow particle size distribution and spherical shape and be free from agglomerate. Surface functionalization and x-ray opacity may also be required. Spherical particles of tin dioxide (SnO2) and another oxide, described in DE 19643781, have these properties but give poor results in nuclear spin tomography. The present oxide particles, which retain the required properties, not only have satisfactory x-ray opacity but also can be detected by nuclear spin tomography.