Hollow borosilicate microspheres and method of making

Details Hollow borosilicate microspheres and method of making Hollow borosilicate microspheres and method of making

1995-03-28

1996-07-09

Ryan, Patrick J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

428404, 428406, 501 39, 65 214, 65 22, B32B 900

Patent

active

055343481

ABSTRACT:
The present invention provides hollow borosilicate microspheres having a mean particle size between 15 and 20 microns, and a true density below 0.25 g/cc. The invention also provides a method for making such microspheres comprising spray drying a solution of sodium silicate and sodium borate in a spray tower to form a precursor, milling the precursor, and heating the crushed precursor to a temperature in excess of 600.degree. F. to form hollow borosilicate microspheres.

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patent: 3699050 (1972-10-01), Henderson
patent: 4119422 (1978-10-01), Rostoker
patent: 4778502 (1988-10-01), Garnier et al.
patent: 5069702 (1991-12-01), Block et al.

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