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# United States Patent [19J 

# Wautier et al. 

# [54] PROCESS FOR THE MANUFACTURE OF VITREOUS METAL OXIDES 

[75] Inventors: Henri Wautier, Braine-le-Comte; Franz Legrand, Quaregnon; Luc Lerot, Brussels, all of Belgium 

[73] Assignee: Solvay & Cie (Societe , Brussels, Belgium 

[21] Appl. No.: 16,373 

[22] Filed: Feb. 19, 1987 

## [30] Foreign Application Priority Data 

Feb. 24, 1986 [FR] France ................................ 86 02618 

[51] Int. CI. 4 .............................................. corn 13/14 

[52] U.S. CI . .................................... 423/592; 423/593; 423/594;423/595;423/596; 423/598;423/599; 423/600;423/604;423/605;423/606;423/607; 423/608; 423/610; 423/617; 423/618; 423/619; 423/622; 423/630; 423/635; 423/641; 501/12 

[58] Field of Search ............... 423/592, 604, 605, 606, 423/608, 617, 618, 630, 635, 593, 594, 595, 598, 600, 607, 609, 610, 619, 622, 596, 599, 641; 501/12 

## [56] References Cited 

<img src='content_image/940806.jpg'>

## U.S. PATENT DOCUMENTS 

# [11] Patent Number: 4,853,207 

# [45] Date of Patent: Aug. 1, 1989 

## FOREIGN PATENT DOCUMENTS 

<img src='content_image/940807.jpg'>

The Condensed Chemical Dictionary 9th edition, Haw› ley, Van Nostrand Reinhold Company, NY, 1977, p. 662. 

Huber, W., Titrations in Nonaqueous Solvents, Academic Press, (1967), p. 220. 

S. R. Gurkovich & J. B. Blum, "Crystallization of Amorphous Lead-Titante Prepared by a Sol-Gel Pro› cess", Ferroelectrics, vol. 62, (1985), pp. 189-194. S. Sakka, "Gel Method for Making Glass", Treatise on Materials Science and Technology, vol. 22, (1982), pp. 129-167. 

S. R. Gurkovich & J. B. Blum, "Preparation of Mono› lithic Lead-Titanate by a Sol-Gel Process", Ultras› truct. Process. Ceram ... Proc. Int. Conf., (1984), pp. 152-160. 

Primary Examiner-Robert L. Stoll 

Assistant Examiner-Paige C. Harvey 

Attorney, Agent, or Firm-Spencer & Frank 

## [57] ABSTRACT 

Process for the manufacture of vitreous metal oxides in which a metal alcoholate derived from an alcohol, the pka of which is less than 15.74, is hydrolysed with an aqueous medium, the pH of which is greater than 1.5. The process is applied especially to the manufacture of vitreous zirconium oxide. 

## OTHER PUBLICATIONS 

## 12 Claims, No Drawings 

