Low density glass particles with low boron content
Assignee3M Innovative Properties Company
InventorGang Qi
Life of this patent
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Abstract
Glass particles comprise glass microbubbles. The glass particles have a size distribution with a d50 in the range of from 15 to 100 microns, and have a true density of less than 0.7 g/cm3. The glass particles comprise, on an equivalent weight basis: from 50 to 70 weight percent silica; from 2 to 7 weight percent of boria; from 0.5 to 4 weight percent of weight zinc oxide; from 8 to 17 weight percent of calcia; from 0.8 to 7 weight percent of phosphorus pentoxide; and from 2 to 9 weight percent of sodium oxide.
Claims12
Glass particles comprising glass microbubbles, wherein the glass particles have a size distribution with a d50 in the range of from 15 to 100 microns, wherein the glass particles have a true density of less than 0.7 g/cm3, and wherein the glass particles comprise, on an equivalent weight basis:
- from 50 to 70 percent of silica, from 4 to 5 percent of boria, from 0.5 to 4 percent of zinc oxide, from 8 to 17 percent of calcia, from 0.8 to 7 percent of phosphorus pentoxide, greater than zero and less than 5 percent of alumina, and from 2 to 9 percent of sodium oxide.
Dependencies are inferred from the claim text.