Hollow glass spheres

Details Hollow glass spheres Hollow glass spheres

1988-08-24

1991-01-08

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 39, 501 57, 501 58, 501 59, 501 63, 501 65, 501 66, 501 67, 501 68, 501 69, 501 70, 501 72, 524494, C03C 1200

Patent

active

049835505

ABSTRACT:
Hollow glass spheres having average densities of approximately 0.10 grams/cc to approximately 2.0 grams/cc are prepared by heating solid glass particles. The glass spheres consist essentially of the following ingredients in the following amounts state as weight percentages: SiO.sub.2 (50 to 57%); R.sub.2 O(2 to 15%); B.sub.2 O.sub.3 (0 to 20%); S(0.05 to 1.5%); RO(2 to 25%); RO.sub.2 (other than SiO.sub.2) (0 to 5%); R.sub.2 O.sub.3 (other than B.sub.2 O.sub.3) (0 to 10%); R.sub.2 O.sub.5 (0 to 5%); and F(0 to 5%). R represents a metal or an element like phosphorous which combines with oxygen in glass. The sizes of the hollow glass spheres are selected to produce a maximum average strength for a desired average density.

REFERENCES:
patent: 3365315 (1968-01-01), Beck et al.
patent: 3519446 (1970-07-01), Earl
patent: 4391646 (1983-07-01), Howell
patent: 4661137 (1987-04-01), Garnier et al.
patent: 4677022 (1987-06-01), DeJaiffe
Volf, Chemical Approach to Glass, (7), pp. 219-221, 229, 418-421, 408-418, 1984.

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