Inorganic rare earth pigments/colorants and synthesis/applications thereof
AssigneeRhone-Poulenc Chimie
InventorsThierry Chopin, Pierre Macaudiere
Life of this patent
Estimating the term…
Abstract
Thermally/chemically stable and nontoxic inorganic pigments/colorants, characteristically green and well suited for the coloration of a wide variety of materials and substrates, for example, plastics, ceramics, etc., comprise at least one mixed oxide of the formula: R2MxM′yO5 in which R is at least one element selected from among yttrium and a rare earth having an atomic number ranging from 62 to 71, inclusive, M and M′, which may be identical or different, are each at least one metallic element exhibiting at least one valence state of +2, and x and y are numbers, the sum x+y of which is equal to 2.
Claims28
A pigmented/colored composition comprising a substance to be colored and a coloring effective amount of agglomerates, grains, or mixtures thereof of a pigment made of at least one mixed oxide of the formula (I):
- R2MxCuyO5
- in which R is yttrium, a rare earths metal having an atomic number ranging from 62 to 71, inclusive, or combination thereof;
- M is barium, magnesium, calcium, or strontium;
- and x and y are two numbers, the sum x+y of which is equal to 2, said substance being different from said mixed oxide and being a synthetic resin, natural rubber, porcelain, crockery, earthenware, paper, dye, cosmetic, ink, or coating composition.
A pigmented/colored composition comprising a substance to be colored and a coloring effective amount of a pigment made of at least one mixed oxide of the formula (I):
- R2MxCuyO5
- in which R is yttrium, a rare earth metal having an atomic numbers ranging from 62 to 71, inclusive, or combination thereof;
- M is barium, magnesium, calcium, or strontium;
- x and y are two numbers, the sum x+y of which is equal to 2, said mixed oxides being in the form of agglomerates having a mean particle size of between 2 and 25 microns, said substance being different from said mixed oxide and being a synthetic resin, natural rubber, porcelain, crockery, earthenware, paper, cosmetic, ink, paper, dye or coating composition.
A pigmented/colored composition comprising a substance to be colored and a coloring effective amount of a pigment made of at least one mixed oxide of the formula (I):
- R2MxCuyO5
- in which R is yttrium, a rare earth metal having an atomic number ranging from 62 to 71, inclusive, or combination thereof;
- M is barium, magnesium, calcium, or strontium;
- and x and y are two numbers, the sum x+y of which is equal to 2, said mixed oxides being in the form of agglomerates having a mean particle size of between 2 and 25 microns, said agglomerates comprising grains having a mean size of between 0.2 and 5 microns, and said substance being different from said mixed oxide and being a synthetic resin, natural rubber, porcelain, crockery, earthenware, paper, cosmetic, ink, dye or coating composition.
A pigmented/colored composition comprising a substance to be colored and a coloring effective amount of a pigment made of at least one mixed oxide of the formula (I):
- R2MxCuyO5
- in which R is yttrium, a rare earth metal having an atomic number ranging from 62 to 71, inclusive, or combinations thereof;
- M is barium, magnesium, calcium, or strontium;
- x and y are two numbers, the sum x+y of which is equal to 2, said mixed oxides being in the form of grains having a mean size of between 0.2 and 5 microns, and said substance being different from said mixed oxide and being a synthetic resin, natural rubber, porcelain, crockery, earthenware, paper, cosmetic, ink, dye or coating composition.
Dependencies are inferred from the claim text.