US4179306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilizing titanium dioxide pigments with vanadates
Assignee: Kerr-Mcgee Pigments & Co KG GmbH
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Filing: 1978-06-08
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Granted: 1979-12-18
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Expires: 1998-06-08
Abstract
Abstract A process for the production of a light-stable and weather-stable titanium dioxide pigment comprising precipitating onto the pigment in aqueous suspension a colorless vanadate of at least one of zinc, magnesium, calcium, strontium and barium at a pH-value above 7 in about 0.01 to 5% by weight, expressed as V2O5, based on TiO2. Advantageously the pigment either before or after precipitation of the vanadate is coated with at least one oxide, oxide hydrate or phosphate of titanium, silicon, aluminum or zirconium.
Inventors
- 👤 Peter Woditsch
- 👤 Eckhard Bayer
- 👤 Peter Panek
- 👤 Heribert Stutgens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:44
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3607; C09C1/3653; C09C1/3661; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
59 words
A process for the production of a light-stable and weather-stable titanium dioxide pigment comprising precipitating onto the pigment in aqueous suspension a colorless vanadate of at least one of zinc, magnesium, calcium, strontium and barium at a pH-value above 7 in about 0.01 to 5% by weight, expressed as V 2 O 5 , based on TiO 2 .
Claim 2
Dependent Claim
59 words
A process for the production of a light-stable and weather-stable titanium dioxide pigment comprising precipitating onto the pigment in aqueous suspension a colorless vanadate of at least one of zinc, magnesium, calcium, strontium and barium at a pH-value above 7 in about 0.01 to 5% by weight, expressed as V 2 O 5 , based on TiO 2 .
Claim 3
Dependent Claim
19 words
A process according to claim 1, including the further steps of filtering off the pigment, washing and drying it.
Claim 4
Dependent Claim
34 words
A process according to claim 1, wherein the pigment either before or after precipitation of the vanadate is coated with at least one oxide, oxide hydrate or phosphate of titanium, silicon, aluminum or zirconium.
Claim 5
Dependent Claim
31 words
A process according to claim 3, wherein the vanadate is precipitated in about 0.5% by weight, the process including the further steps of filtering off the pigment, washing and drying it.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |