Silica-alumina mixed oxide compositions
AssigneeTransparent Materials, LLC
InventorsPatrick M. Lambert, Joseph F. Bringley
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Abstract
The present invention relates to hetero-coagulated silica-alumina mixed oxide compositions that have a sharp refractive index and narrow refractive index dispersion between about 1.46 and 1.60.
Claims21
A composition comprising a hetero-coagulated silica-alumina mixed oxide particle comprising at least one silica colloid and at least one alumina or alumina precursor, wherein the alumina or alumina precursor has an average mean primary particle diameter of less than 50 nm, and wherein said hetero-coagulated silica-alumina mixed oxide particle has an index of refraction between 1.46 and 1.60, and a high transparency when dispersed in a fluid of substantially the same refractive index.
A composition comprising a hetero-coagulated silica-alumina mixed oxide particle comprising at least one silica colloid and at least one alumina or alumina precursor, wherein the alumina or alumina precursor has an average mean primary particle diameter of less than 50 nm, dispersed within a matrix, and wherein said hetero-coagulated silica-alumina mixed oxide particle has an index of refraction between 1.46 and 1.60, and a high transparency when dispersed in a fluid of substantially the same refractive index.
A method of making a hetero-coagulated silica-alumina mixed oxide particle comprising:
- a. simultaneously adding at least one silica colloid to at least one alumina or alumina precursor, wherein the alumina or alumina precursor has an average mean primary particle diameter of less than 50 nm, in a high shear mixing zone.
Dependencies are inferred from the claim text.