W. R. Grace Co.-conn.

Anthony J Colageo

Jacob Block

Roy W Rice

John W Lau

Noel J Tessier

Low sodium hollow glass microspheres containing less than about 3 wt. % Na.sub.2 O are produced from aqueous precursors. The method comprises

Method for making low sodium hollow glass microspheres

Small hollow glass spheres are prepared by adding a surfactant to a liquid glass precursor mixture. The surfactant-containing solution or dispersion can be formed into droplets which are directed into a heated zone and the product collected in a cooler zone. Alternately, the solution or dispersion may be spray-dried, and the spray-dried product is fed into the heated zone and collected in the cooler zone. Nonionic fluorocarbon surfactants are the preferred surfactants.

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Sharon, MA, United States of America

Anthony J Colageo