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1. WO1996004210 - PROCESS FOR PRODUCING SILICA GLASS

Publication Number WO/1996/004210
Publication Date 15.02.1996
International Application No. PCT/JP1994/001289
International Filing Date 04.08.1994
Chapter 2 Demand Filed 01.03.1996
IPC
C03C 1/00 2006.01
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
1Ingredients generally applicable to manufacture of glasses, glazes or vitreous enamels
CPC
C03C 1/006
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
1Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
006to produce glass through wet route
Applicants
  • HITACHI CHEMICAL COMPANY, LTD. [JP/JP]; 1-1, Nishishinjuku 2-chome Shinjuku-ku Tokyo 160, JP (AllExceptUS)
  • TAKEI, Kouichi [JP/JP]; JP (UsOnly)
  • MACHII, Youichi [JP/JP]; JP (UsOnly)
  • SHIMAZAKI, Toshikatsu [JP/JP]; JP (UsOnly)
  • TERASAKI, Hiroki [JP/JP]; JP (UsOnly)
  • BANNO, Hidekuni [JP/JP]; JP (UsOnly)
  • HONNDA, Yutaka [JP/JP]; JP (UsOnly)
  • TAKANE, Nobuaki [JP/JP]; JP (UsOnly)
Inventors
  • TAKEI, Kouichi; JP
  • MACHII, Youichi; JP
  • SHIMAZAKI, Toshikatsu; JP
  • TERASAKI, Hiroki; JP
  • BANNO, Hidekuni; JP
  • HONNDA, Yutaka; JP
  • TAKANE, Nobuaki; JP
Agents
  • TOMITA, Kazuko ; Yokohama HS-Building 7F 9-10, Kitasaiwai 2-chome Nishi-ku Yokohama-shi Kanagawa 220, JP
Priority Data
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) PROCESS FOR PRODUCING SILICA GLASS
(FR) PROCEDE DE PRODUCTION DE VERRE DE SILICE
Abstract
(EN)
A process for producing silica glass wherein cracking is prevented from occurring in the gel drying step. The process comprises preparing a sol by hydrolyzing a partial polycondensate of an alkoxysilane in the presence of a solvent, an organic high-molecular compound and a basic catalyst, converting the sol into a gel, drying the gel, and firing the dried gel, wherein a salt is added in an amount of at least 1 x 10-4 mol to 100 g of the partial polycondensate in the step of preparing a sol.
(FR)
L'invention concerne un procédé de production de verre de silice qui permet d'empêcher la formation de fissures pendant l'étape de séchage du gel. Ledit procédé consiste à préparer un sol par hydrolyse d'un polycondensat partiel d'un alcoxysilane, en présence d'un solvant, d'un composé organique de masse moléculaire élévée et d'un catalyseur basique, à convertir le sol en un gel, à faire sécher le gel obtenu, et à faire cuire le gel séché. Pendant la préparation du sol, un sel est ajouté dans une proportion d'au moins 1 x 10-4 mol pour 100 grammes de polycondensat partiel.
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