Aqueous solutions of alkali polysilicates

Details Aqueous solutions of alkali polysilicates Aqueous solutions of alkali polysilicates

1976-07-08

1978-10-17

Meros, Edward J.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

106 74, C01B 3332

Patent

active

041209389

ABSTRACT:
A process for the preparation of an aqueous alkali metal polysilicate solution having an SiO.sub.2 : alkali metal oxide mole ratio of 2.5 - 5.5 : 1 and a silica content of 16 - 23% by weight which comprises contacting a tetraalkoxysilane of the formula Si(OR).sub.4 wherein each R is independently a straight or branched-chain alkyl group of 1 to 3 carbon atoms with an aqueous alkali metal hydroxide solution at a temperature between room temperature and the boiling point of the reaction mixture and at a temperature up to 100.degree. C. distilling over alcohol formed by the reaction of the silane with the alkali metal hydroxide.

REFERENCES:
patent: 3180747 (1965-04-01), Patton et al.
patent: 3392039 (1968-07-01), Cuneo
patent: 3459500 (1969-08-01), Segura et al.
patent: 3984526 (1976-10-01), Haase et al.
Aelion et al., "J. Am. Chem. Soc.", vol. 72, 1950, pp. 5705-5712.

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