Yellow inorganic pigments and process for preparing same

Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...

Reexamination Certificate

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C106S479000, C423S263000, C252S521100

Reexamination Certificate



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+ηor 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 Pr6O11are 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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