Brucite as a source of magnesium oxide in glass compositions
OwnerJoelle Boehmerinventor
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Abstract
Glass fibers suitable for textile and reinforcements are described. The glass fibers have compositions that include SiO2, CaO, Al2O3, and MgO. A significant amount of the MgO is derived from the mineral brucite. In some instances, the compositions are essentially free of fluorine, sulfate, and titania. These glass fiber compositions typically have broad or large values for delta T (i.e., the difference between the log 3 or forming temperature—the temperature at which the glass has a viscosity of approximately 1,000 poise—and the liquidus temperature).
Claims18
Continuous glass fiber having a composition essentially free of boron and consisting essentially of 59.0 to 62.0 weight percent SiO2, 20.0 to 24.0 weight percent CaO, 12.0 to 15.0 weight percent Al2O3, 1.0 to 4.0 weight percent MgO, 0.0 to 0.5 weight percent F2, 0.1 to 2.0 weight percent Na2O, 0.0 to 0.9 weight percent TiO2, 0.0 to 0.5 weight percent Fe2O3, 0.0 to 2.0 weight percent K2O, and 0.0 to 0.5 weight percent SO3, wherein the composition has (i) a viscosity of 1000 poise at a forming temperature of from 2100° F. (1149° C.) to 2500° F. (1371° C.) and (ii) a liquidus temperature at least 100° F. (38° C.) below the forming temperature;
- and wherein at least a portion of the MgO is derived from brucite.
Dependencies are inferred from the claim text.