US4450012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flocculation-resistant, mixed phase pigments having a rutile structure, process for their preparation, and their use
Assignee: Bayer AG
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Filing: 1982-09-08
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Granted: 1984-05-22
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Expires: 2002-09-08
Abstract
Abstract Coated rutile mixed phase pigments comprise a mixed phase rutile pigment having a first coating of an oxide or hydrated oxide of titanium, zirconium, tin or a mixture thereof and a subsequent coating of an oxide or hydroxide of aluminum, and those pigments exhibit an improved tendency against flocculation in lacquers hardened with acid catalysts.
Inventors
- 👤 Dieter Messer
- 👤 Volker Wilhelm
- 👤 Robert Endres
- 👤 Heinrich Heine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:55
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3607; C09C1/3653; C09C1/3661; C09C1/0081; C09C1/0084; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
45 words
Coated rutile mixed phase pigments comprising a mixed phase rutile pigment having a first coating of an oxide or hydrated oxide of a metal selected from tetravalent titanium, zirconium, tin and mixtures thereof, and a final coating of an oxide or hydrated oxide of aluminium.
Claim 2
Dependent Claim
45 words
Coated rutile mixed phase pigments comprising a mixed phase rutile pigment having a first coating of an oxide or hydrated oxide of a metal selected from tetravalent titanium, zirconium, tin and mixtures thereof, and a final coating of an oxide or hydrated oxide of aluminium.
Claim 3
Dependent Claim
43 words
Coated rutile mixed phase pigments according to claim 1 wherein said first coating amounts to from 0.5 to 20% by weight, based on the dry pigment, and said final coating amounts to from 0.5 to 20% by weight, based on the dry pigment.
Claim 4
Dependent Claim
41 words
Coated rutile mixed phase pigments according to claim 2 wherein said first coating amounts to 1 to 10% by weight, based on the dry pigment, and said final coating amounts to 1 to 10% by weight, based on the dry pigment.
Claim 5
Dependent Claim
77 words
The process for preparation of coated rutile mixed phase pigments according to claim 1 comprising: (a) first precipitating a layer of an oxide or hydrated oxide of titanium, zirconium, tin or mixtures thereof onto annealed and ground mixed phase rutile pigment in an aqueous suspension; (b) subsequently precipitating a final layer of an oxide or hydrated oxide of aluminium on the once coated pigment from step (a); and (c) washing and drying the twice coated rutile pigment.
Claim 6
Dependent Claim
50 words
The process according to claim 4 wherein the mixed phase rutile pigment concentration in the aqueous suspension is from 10 to 60% by weight and each of the two precipitations is conducted until each of the two layers respectively amount to 0.5 to 20% by weight of the dry pigment.
Claim 7
Dependent Claim
48 words
The process according to claim 4 or claim 5 wherein the oxide or hydrated oxide of titanium, zirconium or tin is precipitated from an acidic solution of a water soluble salt and the final layer of aluminum oxide or hydrated oxide is precipitated from an aluminium sulfate solution.
Claim 8
Dependent Claim
72 words
The process according to claim 4 or claim 5 wherein an aqueous suspension of mixed phase rutile pigment is mixed with a titanyl sulfate solution; the ph of the suspension is adjusted with sodium hydroxide to precipitate hydrated titanium dioxide onto the rutile; the suspension is then mixed with an aluminium sulfate solution and the pH is adjusted to from 5 to 9 to precipitate hydrated aluminum oxide as a final layer.
Claim 9
Dependent Claim
73 words
The process according to claim 4 or claim 5 wherein an aqueous suspension of mixed phase rutile pigment is mixed with a zirconium sulfate solution; the pH of the suspension is adjusted with sodium hydroxide to precipitate hydrated zirconium dioxide onto the rutile pigment; the suspension is then mixed with an aluminium sulfate solution and the pH is adjusted to from 5 to 9 to precipitate hydrated aluminum oxide as a final layer.
Claim 10
Dependent Claim
32 words
In the process of pigmenting plastics and lacquers by adding a color-producing amount of a pigment, the improvement comprises said pigment being a coated rutile mixed phase pigment according to claim 1.
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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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |