Blue inorganic colourants/pigments and process for preparation thereof
AssigneeCouncil of Scientific and Industrial Research
InventorsMundlapudi Lakshmipathi Reddy, Sheethu Jose
Life of this patent
Estimating the term…
Abstract
Nontoxic Near infra-red Reflecting (NIR) inorganic pigments, characteristically blue and well suited for the coloration of a wide variety of substrates, for example, plastics and concrete building roofing material, etc., comprise mixed metal silicate having the general formula: LaxSr1-xCu1-yLiySi4O10, where x is equal to 0 to 0.5 and y is equal to 0 to 0.5. These silicates with tetragonal crystal structure are prepared by calcination method in air atmosphere.
Claims9
A blue inorganic pigment represented by the general formula LaxSr1-xCu1-yLiySi4O10 wherein x is equal to 0.1 to 0.5 and y is equal to 0.1 to 0.5, wherein the pigment comprises an average particle size of 2 to 6 micrometers, wherein said pigment is having reflectance at near infra-red wavelength.
Dependencies are inferred from the claim text.