Patent · US Expired

Method for increasing the bulk weight of silicon dioxide

US4326852A · kind A · utility

6Cited by

9References

4Claims

0Family size

Assignee

Wacker Chemie AG · DE

Inventors

Gunter Kratel · Kempten (Allgäu), DE
Gerhard Dummer · Altötting, DE
Peter Niessner · Kempten (Allgäu), DE
Burkhard Grune · Burghausen, DE
Gunter Stohr

Key dates

Filing date	Oct 11, 1979
Grant date	Apr 27, 1982
Priority date	—
Expiry date	Oct 11, 1999

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC10M2201/14
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

A method for increasing the bulk weight of silicon dioxide with a surface of at least 50m.sup.2 /g by means of sub-atmospheric pressure applied at a filter face, wherein the silicon dioxide is moved by means of a conveyor screw, whose longitudinal axis is arranged parallel with respect to the filter face and which preferably has a decreasing thread pitch in feeding direction. Furthermore, the invention relates to the use of the treated silicon dioxide as a filler material for polymeric masses, especially diorganopolysiloxane, which is storeable in the absence of water and when admixed with water at room temperature results in a hardened elastomer mass.

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