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US 6,582,814 B2Granted
Rare earth-transition metal oxide pigments
Assigneedmc2 Degussa Metals Catalysts Cerdec AG
InventorsDaniel R. Swiler, Terry J. Detrie, Enos A. Axtell, III
Life of this patent
Estimating the term…
Abstract
Rare earth-transition metal oxides are used as pigments. The rare earth-transition metal oxide pigments are preferably of the formula (RexTm)Oy, where Re is at least one rare earth element, Tm is at least one transition metal, x ranges from 0.08 to 12, and y ranges from x+1 to 2x+2. The pigments are useful as colorants, and possess good stability.
Claims10
A coating composition comprising:
- a liquid carrier;
- and
- a pigment comprising rare earth-transition metal oxide dispersed in the carrier, wherein the rare earth-transition metal oxide is of the formula (RexTm)Oy, where Re is at least one rare earth element selected from Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, Tm is at least one transition metal selected from Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn, x ranges from 0.08 to 12, and y ranges from x+1 to 2x+2.
An enamel composition comprising:
- at least one glass frit;
- and
- a pigment comprising rare earth-transition metal oxide, wherein the rare earth-transition metal oxide is of the formula (RexTm)Oy, where Re is at least one rare earth element selected from Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, Tm is at least one transition metal selected from Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn, x ranges from 0.08 to 12, and y ranges from x+1 to 2x+2.
An article comprising:
- a substrate matrix;
- and
- a pigment comprising rare earth-transition metal oxide dispersed in the substrate matrix, wherein the rare earth-transition metal oxide is of the formula (RexTm)Oy, where Re is at least one rare earth element selected from Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, Tm is at least one transition metal selected from Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn, x ranges from 0.08 to 12, and y ranges from x+1 to 2x+2.
An article comprising:
- a substrate;
- and
- a coating including a pigment comprising rare earth-transition metal oxide covering at least a portion of the substrate, wherein the rare earth-transition metal oxide is of the formula (RexTm)Oy, where Re is at least one rare earth element selected from Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, Tm is at least one transition metal selected from Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn, x ranges from 0.08 to 12, and y ranges from x+1 to 2x+2.
A method of making a rare earth-transition metal oxide pigment comprising:
- mixing powders of rare earth oxide or precursors capable of forming a rare earth oxide with a transition metal oxide or precursors capable of forming a transition metal oxide;
- and
- calcining the mixture to form a pigment of the formula (RexTm)Oy, where Re is at least one rare earth element selected from Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, Tm is at least one transition metal selected from Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn, x ranges from 0.08 to 12, and y ranges from x+1 to 2x+2.
Dependencies are inferred from the claim text.