Preparation of very fine glass powder of high purity

Details Preparation of very fine glass powder of high purity Preparation of very fine glass powder of high purity

1992-05-12

1994-08-23

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C03C 300

Patent

active

053407768

ABSTRACT:
For the preparation of high purity glass powder having a mean particle size of .ltoreq.10 .mu.m, glass powder having a larger particle size up to 300 .mu.m is ground to the desired particle size in a stirred mill with glass grinding elements in the presence of a grinding liquid comprising water or preferably a mixture of at least 50% by weight of water and at least one water-soluble, oxygen-containing organic compound having 1 to 5 carbon atoms in the molecule, e.g., tert.-butyl alcohol; the ground slurry is then frozen, and the solvent is subsequently removed from the frozen slurry by freeze-drying. A resultant glass powder with a mean particle size d.sub.50 of 0.5 to 2 .mu.m is particularly suitable as a filler for synthetic resins in the dental sector.

REFERENCES:
patent: 3126293 (1964-03-01), McSheehy et al.
patent: 3358938 (1967-12-01), Browal
patent: 3423032 (1969-01-01), Eckert
patent: 3881661 (1975-05-01), Powers et al.
patent: 4056230 (1977-11-01), Decobart
patent: 4202815 (1980-05-01), Wegmann
patent: 5047182 (1991-09-01), Sundback et al.
James S. Reed, Introduction to the Principles of Ceramic Processing, Wiley & Sons 1988 (no month) pp. 53, 126-127, 255-258, 268-271, 274, 423.

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