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US 5,069,702 AGranted
Method of making small hollow glass spheres
AssigneeW. R. Grace & Co.-Conn.
InventorsJacob Block, Noel J. Tessier, Anthony J. Colageo
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Abstract
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.
Claims20
A process for the preparation of hollow glass spheres comprising the steps of:
- a) combining
- i) a surfactant,
- ii) at least one source of components necessary to form said glass,
- iii) a compound capable of producing a gas when heated, and
- iv) water, to form an aqueous solution or dispersion;
- b) forming droplets from the surfactant-containing solution or dispersion;
- c) heating the droplets to form hollow glass spheres;
- and
- d) cooling and recovering the hollow glass spheres.
6 more elements
Dependencies are inferred from the claim text.