Process for preparing grit blasting particles coated with titanium dioxide

US6468658B2 · kind B2 · utility

Assignee

• Degussa AG · DE

Inventors

• Gerlinde Lange · Langenselbold, DE
• Manfred Schuck · Sindelfingen, DE
• Katja Heck · Großkrotzenburg, DE
• Andreas Gutsch · Thedinghausen, DE
• Guido Zimmermann · Hanau, DE

Key dates

• Filing date: May 29, 2001
• Grant date: Oct 22, 2002
• Expiry date: May 29, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2993
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for preparing grit blasting particles coated with titanium dioxide by sinter-fusing titanium dioxide on the surface of grit blasting particles made of a base material. A mixture of finely divided titanium dioxide and grit blasting particles is passed continuously through the flame in a flame reactor, with the aid of conveying air, wherein the titanium dioxide is sinter-fused on the surface of the grit blasting particles over an average residence time of 0.1 to 5 seconds in a temperature range from 600 to 1200° C. An increase in the adhesive bond between metal framework and a facing material made of plastics in dentures can be achieved when metal framework is grit blasted with a grit blasting agent containing titanium dioxide coated grit blasting particles and then the grit blasted and titanium dioxide coated surface is treated with a silane bonding agent.