Inorganic pigments of the empirical formula A.sub.x B.sub.y C.sub.z
First Claim
1. A pigment of irregular-shaped particles comprising crystallites of the empirical formula Ax By Cz wherein A is copper, iron, or manganese;
- B is chromium;
C is oxygen, selenium, tellurium or sulfur;
x is 1, 2 or 3;
y is 2 or 3; and
z is greater than 3;
the crystallites have an average size of from about 75 to about 600 Angstroms; and
the surface area of the pigment particles is greater than zero up to about 20 m2 /g.
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Abstract
A pigment of irregular-shaped particles is described which comprises crystallites of the empirical formula Ax By Cz wherein A and B are different; A is cobalt, nickel, copper, zinc, cadmium, iron, manganese or any combination thereof; B is aluminum, chromium, molybdenum, iron, vanadium, manganese or any combination thereof; C is oxygen, selenium, tellurium or sulfur; x is 1, 2 or 3; y is 2 or 3; and z is greater than 3; the crystallites have an average size of from about 75 to about 600 Angstroms; and the surface area of the pigment particles is greater than zero up to about 20 m2 /g. In one embodiment, when the pigment contains a mixture of copper oxide, iron oxide, manganese oxide and no chromium, the pigment contains no more than 10% of manganese, and when the pigment contains copper oxide, chromium oxide, and manganese oxide, the pigment contains up to about 5% of manganese oxide, the mole ratio of chromium to copper is no greater than about 1.3 to 1.
41 Citations
19 Claims
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1. A pigment of irregular-shaped particles comprising crystallites of the empirical formula Ax By Cz wherein A is copper, iron, or manganese;
- B is chromium;
C is oxygen, selenium, tellurium or sulfur;
x is 1, 2 or 3;
y is 2 or 3; and
z is greater than 3;
the crystallites have an average size of from about 75 to about 600 Angstroms; and
the surface area of the pigment particles is greater than zero up to about 20 m2 /g. - View Dependent Claims (2)
- B is chromium;
- 3. A pigment of irregular-shaped particles comprising crystallites of the empirical formula Cux Cry Oz wherein x and y are 2, z is 5, the mole ratio of chromium to copper in the pigment is less than about 1.3 to 1, the crystallites have an average size of from about 75 to about 250 Angstroms, the surface area of the pigment particles is greater than zero up to about 20 m2 /g, and the pigment also contains from zero to about 20% of manganese or titanium.
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5. A pigment of irregular-shaped particles comprising crystallites of the empirical formula Ax By Cz wherein A is copper, iron, or manganese;
- B is chromium, molybdenum;
C is oxygen, selenium, tellurium or sulfur;
x is 1, 2 or 3;
y is 2 or 3; and
z is greater than 3;
the crystallites have an average size of from about 75 to about 600 Angstroms;
the surface area of the pigment particles is greater than zero up to about 20 m2 /g, and the average particle size of the pigment particle is less than about one micron.
- B is chromium, molybdenum;
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6. A pigment of irregular-shaped particles comprising crystallites of the empirical formula Cux Cry Oz wherein x and y are 2, z is 5, the average crystallite size is from about 75 to about 250 Angstroms, the surface area of the pigment particles is greater than zero up to about 20 m2 /g;
- and the average particle size of the pigment particle is less than about 1 micron, and the pigment also contains from zero to about 20% of manganese or titanium.
- View Dependent Claims (7)
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8. A pigment of irregular-shaped particles comprising crystallites of the empirical formula Cux Cry Oz wherein x and y are 2, z is 5, the pigment also contains from about 3 to about 12% manganese, the average crystallite size is from about 100 to about 175 Angstroms, the surface area of the pigment particles is greater than zero up to about 20 m2 /g;
- and the average particle size of the pigment particle is less than about 1 micron.
- 9. A copper-chromium oxide pigment of irregular-shaped particles comprising crystallites of the empirical formula Cu2 Cr2 O5 having an average crystallite size of from about 75 to about 250 Angstroms, said pigment also containing from zero to about 20% by weight of manganese and having a surface area of greater than zero up to about 20 m2 /g, wherein the mole ratio of chromium to copper in the pigment is less than about 1.3 to 1.
- 15. An iron-chromium oxide pigment of irregular-shaped particles comprising crystallites of the formula FeCr3 O6 having an average crystallite size of from about 100 to about 600 Angstroms and the particles have a surface area of greater than zero up to about 20 m2 /g.
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17. A pigment of irregular-shaped particles comprising crystallites of the empirical formula FeCr3 O6 wherein the crystallites have an average size of from about 75 to about 600 Å
- ; and
the surface area of the pigment particles is greater than zero up to about 20 m2 /g.
- ; and
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18. A pigment of irregular-shaped particles comprising crystallites of the empirical formula Cu2 Cr2 O5 wherein the crystallites have an average size of from about 75 to about 600 Å
- ; and
the surface area of the pigment particles is greater than zero up to about 20 m2 /g.
- ; and
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19. A pigment of irregular-shaped particles comprising crystallites of the empirical formula Mn2 Cr2 Oz wherein z is greater than 3;
- the crystallites have an average size of from about 75 to about 600 Å
; and
the surface area of the pigment particles is greater than zero up to about 20 m2 /g.
- the crystallites have an average size of from about 75 to about 600 Å
Specification