C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/77
C03B 20/00 (2006.01) C03B 37/016 (2006.01) C03C 13/04 (2006.01) C03C 23/00 (2006.01)
Patent
CA 1174472
TITLE OF THE INVENTION A process for the production of an optical glass article ABSTRACT OF THE DISCLOSURE This invention relates to a process for the production of an optical glass article, which comprises neutralizing an aqueous solution containing silicic acid to form a porous gelled body, removing soluble materials from the porous gell- ed body to form a porous glass body, stuffing the porous glass body with a solution containing at least one compound capable of being converted into an oxide dopant for changing the refractive index, selected from the group consisting of CsNO3, RbNO3 and TlNO3, unstuffing with a solvent or solution having a suitable composition at a suitable temperature to leach the compound out of the outside and to give a predeter- mined consentration distribution in the micropores, optional- ly immersing the unstuffed body in an organic solvent, preci- pitating the compound in the micropores, drying the glass body in a predetermined atmosphere to decompose the compound, fur- ther heating at a higher temperature, and then firing at a temperature sufficient high to decompose completely the compound and to burn completely the organic materials but lower than the melting point of silica.
385478
Kurosaki Shiro
Watanabe Minoru
Riches Mckenzie & Herbert Llp
Sumitomo Electric Industries Ltd.
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