Patent · US Expired

Hydrophobic silica aerogels

US5738801A · kind A · utility

31Cited by

7References

21Claims

0Family size

Assignee

BASF SE

Inventors

Bernd Ziegler · Ludwigshafen, DE
Norbert Mronga · Dossenheim, DE
Friedhelm Teich · Karlsruhe, DE
Gunter Herrmann · Calw, DE

Key dates

Filing date	Feb 29, 1996
Grant date	Apr 14, 1998
Priority date	—
Expiry date	Feb 29, 2016

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08K3/36
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Hydrophobic silica aerogels obtainable by reacting a waterglass solution with an acid at a pH of from 7.5 to 11, substantially removing ionic constituents from the resulting silica hydrogels by washing with water or dilute aqueous solutions of inorganic bases, while the pH of the hydrogels is kept in the range from 7.5 to 11, displacing the aqueous phase contained in the hydrogel by an alcohol, and subsequent supercritical drying of the resulting alcogels.

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