EP 1094990 A1 20010502 - METHODS FOR MAKING ULTRA-LOW EXPANSION SILICA-TITANIA GLASSES
Title (en)
METHODS FOR MAKING ULTRA-LOW EXPANSION SILICA-TITANIA GLASSES
Title (de)
VERFAHREN ZUR HERSTELLUNG VON KIESELSÄURE-TITANDIOXID-GLÄSERN MIT ULTRANIEDRIGER AUSDEHNUNG
Title (fr)
PROCEDES DE FABRICATION DE VERRES EN SILICE-ANHYDRIDE TITANIQUE A EXPANSION ULTRA FAIBLE
Publication
Application
Priority
- US 9908777 W 19990421
- US 8271098 P 19980422
Abstract (en)
[origin: WO9954259A1] Ultra-low expansion silica-titania glasses are produced by flame deposition of a mixture of vaporized octamethylcyclotetrasiloxane (OMCTS) and vaporized titanium isopropoxide (Ti-Ipox). Ti-Ipox is vaporized by nitrogen bubbled from conduit (16) into tank (12) and OMCTS is vaporized by nitrogen bubbled from conduit (14) in tank (10). Before being mixed with the Ti-Ipox, the OMCTS is dried so that its water content is less than 2 ppm and preferably less than 1 ppm. In this way, the formation of a precipitate on the glass making equipment (e.g., burners (28), distribution manifold (26), static mixer (18), joint (13), and conduits (20, 22, 24 and 30)) is avoided. Such a precipitate if allowed to form will result in premature shutdown of the glass making process and can result in undesirable variations in the composition of the silica-titania glass being produced.
IPC 1-7
IPC 8 full level
C03B 8/04 (2006.01); C03B 19/14 (2006.01); C03C 3/06 (2006.01)
CPC (source: EP)
C03B 19/1415 (2013.01); C03C 3/06 (2013.01); C03B 2201/02 (2013.01); C03B 2201/42 (2013.01); C03B 2207/32 (2013.01); C03B 2207/34 (2013.01); C03B 2207/85 (2013.01); C03C 2201/42 (2013.01); C03C 2203/40 (2013.01)
Citation (search report)
See references of WO 9954259A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 9954259 A1 19991028; EP 1094990 A1 20010502; JP 2002512169 A 20020423
DOCDB simple family (application)
US 9908777 W 19990421; EP 99919954 A 19990421; JP 2000544606 A 19990421