Patent · US Expired

Metal oxide particles coated with silicon dioxide

US6773814B2 · kind B2 · utility

26Cited by

7References

20Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Kai Schumacher · Hofheim, DE
Helmut Mangold · Rodenbach, DE
Steffen Hasenzahl · Hanau, DE
Harald Alff · Alzenau, DE

Key dates

Filing date	Aug 7, 2002
Grant date	Aug 10, 2004
Priority date	—
Expiry date	Aug 7, 2022

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2993
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

Metal oxide particles having a metal oxide core and a silicon dioxide coating have a low structure. The particle are produced by a base dissolved in water being added under agitation to a dispersion comprising a metal oxide, at least one compound of the type XnSi(OR)4−n, and water, the reaction product being separated out, optionally washed with water and dried. The metal oxide particles coated with silicon dioxide may be used in sun screening agents and in chemical-mechanical-polishing (CMP) applications.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.