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US4093777A
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US
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Coated stabilized cadmium chalcogenide pigments
Assignee: Bayer AG
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Filing: 1975-10-06
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Granted: 1978-06-06
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Expires: 1995-10-06
Abstract
Abstract A stabilized cadmium chalcogenide, in which optionally zinc and/or mercury is present in the lattice, carrying at least one coating of a sparingly-soluble sulfide is produced by adding at least one water-soluble salt of an element forming a sparingly-soluble sulfide to an aqueous chalcogenide suspension, mixing with a compound releasing sulfide ions and/or mixing the cadmium chalcogenide suspension with a soluble thio-compound of an element forming a sparingly-soluble sulfide thereby to precipitate a sparingly-soluble sulfide onto the chalcogenide, subsequently filtering, optionally washing, drying and annealing the aftertreated chalcogenide. Suitable sparingly-soluble sulfides are, for example, the sulfides of the elements Zn, Hg, In, Sn, Pb, As, Sb, Bi, V, Mo, W, Cu and Ag.
Inventors
- 👤 Heinrich Heine
- 👤 Peter Woditsch
- 👤 Theodor Bohmann
- 👤 Dieter Rade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:10
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/10; C01; C01B; C01B19/00; C01B19/007; C01G; C01G11/00; C01P; C01P2006/00; C01P2006/80; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998; Y10T428/31504; Y10T428/31652; Y10T428/31667
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
15 words
A coated stabilized cadmium chalcogenide pigment carrying a coating of at least one sparingly-soluble sulfide.
Claim 2
Dependent Claim
15 words
A coated stabilized cadmium chalcogenide pigment carrying a coating of at least one sparingly-soluble sulfide.
Claim 3
Dependent Claim
22 words
A cadmium chalcogenide according to claim 1, selected from the group consisting of cadmium sulfide, cadmium selenide, cadmium sulfo-selenide and mixtures thereof.
Claim 4
Dependent Claim
34 words
A cadmium chalcogenide according to claim 1, wherein up to about 20% of the cadmium in the lattice is replaced by at least one member selected from the group consisting of zinc and mercury.
Claim 5
Dependent Claim
48 words
A cadmium chalcogenide according to claim 1, wherein the coating comprises about 0.01 to 10% by weight of the chalcogenide of at least one sulfide of a member selected from the group consisting of zinc, mercury, indium, tin, lead, arsenic, antimony, bismuth, vanadium, molybdenum, tungsten, copper and silver.
Claim 6
Dependent Claim
42 words
A cadmium chalcogenide according to claim 1, further carrying a coating in about 0.1 to 10% by weight of the chalcogenide of at least one member selected from the group consisting of SiO 2 , a sparingly-soluble phosphate and a sparingly-soluble silicate.
Claim 7
Dependent Claim
101 words
A cadmium chalcogenide according to claim 2, wherein up to about 15% of the cadmium in the lattice is replaced by at least one member selected from the group consisting of zinc and mercury, the coating comprises about 0.01 to 2% by weight of the chalcogenide of at least one sulfide of a member selected from the group consisting of zinc, indium, tin and antimony, and carrying a further coating in about 1 to 5% by weight of the chalcogenide of at least one member selected from the group consisting of SiO 2 , a sparingly-soluble phosphate and a sparingly-soluble silicate.
Claim 8
Dependent Claim
41 words
In a lacquer or plastic pigmented with about 0.1 to 50% by weight of cadmium chalcogenide, the improvement wherein said cadmium chalcogenide is a coated pigment according to claim 1, whereby the pigment is stabilized against leaching out therefrom of cadmium.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |