Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Padala Prabhakar Rao0
Mundlapudi Lakshmipathi Reddy0
Date of Patent
November 23, 2010
Patent Application Number
12036848
Date Filed
February 25, 2008
Patent Primary Examiner
Patent abstract
The present invention provides yellow inorganic pigments comprising praseodymium, oxides of transition metals selected from molybdenum, titanium, zirconium and combinations thereof, essentially molybdenum, optionally with alkaline earth metal (A) and the said yellow inorganic pigment has a general formula APr2MoTmxO6+η or Pr2MoTmxO6+η (Tm=Ti or Zr, x=0 or 1, and wherein η has a value commensurate with the value of x and sufficient to satisfy the valencies of the formula). High purity chemicals such as MgCO3, CaCO3, SrCO3, BaCO3, TiO2, ZrO2, (NH4)6Mo7O24.4H2O and Pr6O11 are weighted in the stoichiometric ratio, ball milled and calcined in the range 900°-1200° C. for 3-12 hrs in air.
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