Patent · US Expired

Precipitated silicas having a narrow particle size distribution

US6902715B2 · kind B2 · utility

5Cited by

6References

21Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Ralf Maus · Ditzingen, DE
Thomas Barthel · Detroit Lakes, US
Claas-Jurgen Klasen · Alzenau, DE

Key dates

Filing date	Feb 8, 2002
Grant date	Jun 7, 2005
Priority date	—
Expiry date	Aug 1, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/19
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The present invention provides silica particles, which include the following physical properties: BET surface area: 100-700 m2/g; DBP absorption: 100-500 g/100 g; tamped density: 100-250 g/l; ALPINE sieve residue>63μ: <5%; and particle sizes (cumulative volume distribution): d95<40 μm; d50<20 μm; and d5<10 μm. The present invention also provides a process for producing silica having a narrow particle size distribution, which includes drying a silica suspension in a pulse combustion dryer to produce silica particles having the following particle size distribution (cumulative volume distribution): d5<10 μm; d50<20 μm; and d95<40 μm.

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