Patent · US Expired

Process for the production of silica with an aerogel type structure

US4150101A · kind A · utility

21Cited by

13References

28Claims

0Family size

Assignee

Deutsche Gold- und Silber-Scheideanstalt Vormals Roessler

Inventors

Felix Schmidt · Baldegg, CH
Kurt Spitznagel · Hanau, DE
Adolf Wagner · Gelnhausen, DE

Key dates

Filing date	Mar 14, 1975
Grant date	Apr 17, 1979
Priority date	—
Expiry date	Mar 14, 1995

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/19
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Aerogel like silica is prepared having: PA1 A BET surface area between 80-450 m.sup.2 /g; PA1 A bulk density between 10-60 g/l; PA1 A DBP number between 2.4-3.8; PA1 An average particle size range of 0.1-7 .mu.m; PA1 A most frequent particle size range of 1-2 .mu.m; PA1 A pH value in a 4% aqueous suspension of 6-8. The aerogel is produced by homogeneously distributing 5-50 weight % of water in air dispersed pyrogenic silica and drying the powdery mixture obtained. The products are especially useful as delustering agents.

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