EP 0646097 A1 19950405 - PROCESS FOR THE PREPARATION OF A SILICA AEROGEL-LIKE MATERIAL.
Title (en)
PROCESS FOR THE PREPARATION OF A SILICA AEROGEL-LIKE MATERIAL.
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES KIESELSÄUREACHTIGEN MATERIALS.
Title (fr)
PROCEDE DE PREPARATION D'UN MATERIAU ANALOGUE A UN AEROGEL DE SILICE.
Publication
Application
Priority
- NO 9200096 W 19920522
- NO 912006 A 19910524
Abstract (en)
[origin: WO9220623A1] A process for the preparation of silica xerogel by hydrolysis and polycondensation of a tetraalkoxysilane to form an alcogel which is a silica skeleton surrounded by an aqueous methanol, whereafter the aqueous methanol is removed by evaporation. The alcogel formed is brought in contact with a solution of tetraalkoxysilane, the contact is maintained at or above room temperature to strengthen the silica skeleton, whereafter the gel is dried slowly at or above room temperature and at about atmospheric pressure. Before the alcogel is brought in contact with the solution of tetraalkoxylsilane it may be washed with a solution (e.g. aqueous methanol) to change the composition of the aqueous alcohol surrounding the silica skeleton or to change the functional groups on the surface of the alcogel.
IPC 1-7
IPC 8 full level
C01B 33/16 (2006.01)
CPC (source: EP)
C01B 33/163 (2013.01)
Citation (search report)
See references of WO 9220623A1
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE
DOCDB simple family (publication)
WO 9220623 A1 19921126; AU 1785292 A 19921230; AU 662147 B2 19950824; BR 9206051 A 19941115; CA 2109715 A1 19921126; EP 0646097 A1 19950405; FI 935203 A0 19931123; FI 935203 A 19940113; JP H06510268 A 19941117; NO 912006 D0 19910524; NO 934233 D0 19931123; NO 934233 L 19931123
DOCDB simple family (application)
NO 9200096 W 19920522; AU 1785292 A 19920522; BR 9206051 A 19920522; CA 2109715 A 19920522; EP 92910393 A 19920522; FI 935203 A 19931123; JP 51055292 A 19920522; NO 912006 A 19910524; NO 934233 A 19931123