Method for the preparation of vitreous hollow microspheres

Details Method for the preparation of vitreous hollow microspheres Method for the preparation of vitreous hollow microspheres

1996-07-09

1997-03-25

Utech, Benjamin

Coating processes

Particles, flakes, or granules coated or encapsulated

427215, 4273722, 501 80, 501 84, 501 85, 106605, 65 214, 65 31, B05D 700

Patent

active

056142552

ABSTRACT:
Proposed is an efficient method for the preparation of vitreous hollow microspheres from particles of a vitreous volcanic deposit by a heat treatment to effect expansion of the particles by foaming. The inventive method comprises a step, prior to the heat treatment for expansion of the particles, in which the starting particles are dispersed in an aqueous medium containing aluminum sulfate and urea each in a specified concentration followed by a heating treatment of the dispersion so as to deposit a coating layer of aluminum hydroxide on the particle surface so that the efficiency of foaming can be greatly improved without the disadvantage of particle agglomeration.

REFERENCES:
patent: 3904377 (1975-09-01), Honda et al.
patent: 5017523 (1991-05-01), Kimura et al.

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