Yellow inorganic pigments and process for preparing same

Details Yellow inorganic pigments and process for preparing same Yellow inorganic pigments and process for preparing same

2008-02-25

2010-11-23

Michener, Jennifer K (Department: 1795)

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C106S479000, C423S263000, C252S521100

Reexamination Certificate

active

07837782

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+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.

REFERENCES:
patent: 3899347 (1975-08-01), de Ahna et al.
patent: 5275649 (1994-01-01), Linke et al.
J.A. Alonso, F. Rivillas, M.J. Martinez-Lope, V. Pomjakushin. Preparation and structural study from neutron diffraction data of R2MoO6 (R=Dy, Ho, Er, Tm, Yb, Y), J. Solid State Chem., 177 (2004) 2470-2476.
P.S. Berdonosov, D.O. Charkin, K.S. Knight, K.E. Johnston, R.J. Goff, V.A. Dolgikh, P. Lightfoot. Phase relations and crystal structures in the systems (Bi,Ln)2WO6 and (Bi,Ln)2MoO6 (Ln = lanthanide), J. Solid State Chem., 179 (2006) 3437-3444.
G. George, G. George, P.P. Rao, M.L. Reddy. Synthesis and Characterization of Environmentally Benign Nontoxic Pigments: RE2Mo2O9 (Re = La or Pr), Chem. Lett., vol. 34, No. 12 (2005) 1702-1703.
F. De Smet, P. Ruiz, B. Delmon, M. Devillers. Evaluation of the role played by praseodymium molybdates in Pr6O11-MoO3 catalysts for the selective oxidation of isobutene to methacrolein, Appl. Catal. A: General, 172 (1998) 333-349.
P. Gall and P. Gougeon. The pyrochlore-type molybdate Pr1.37Ca0.63Mo2O7, Acta Cryst. 2008, E64, i42.
T. Yamazaki, T. Shimazaki, T. Hashizume, K. Terayama. Investigation of double oxides in the system of Pr-Mo-O, J. Mater. Sci. Lett., 2002, 21, 29-31.
T. Shimazaki, T. Yamazaki, K. Terayama. Phase relations in the Pr-Mn-O system at 1000 oC, J. Mater. Sci. Lett., 2000, 19, 2029-2031.
Shin-Etsu Chemical Co., Product Information, 2005, 1-2.

Affiliated with

Also associated with

Rating

Yellow inorganic pigments and process for preparing same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Yellow inorganic pigments and process for preparing same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Yellow inorganic pigments and process for preparing same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4211883