US4222789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-stable titanium dioxide pigment composition
Assignee: EIDP Inc
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Filing: 1978-11-30
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Granted: 1980-09-16
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Expires: 1998-11-30
Abstract
Abstract Light-stable TiO 2 pigment composition consisting of TiO 2 , Al 2 O 3 and antimony oxide wherein the Al 2 O 3 and antimony oxide are in solid solution with the TiO 2 or in the form of AlSbO 4 or a combination of the two.
Inventors
- 👤 Howard W. Jacobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:56
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3607; C09C1/3653; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84; C01P2004/86; C01P2006/00; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
53 words
A pigment composition having the X-ray pattern only of rutile, said composition consisting essentially of from 92% to 99% by weight of TiO 2 , from 0.05% to 2% by weight of Al 2 O 3 and from 0.1% to 6% by weight of antimony oxide, calculated as Sb 2 O 3 .
Claim 2
Dependent Claim
53 words
A pigment composition having the X-ray pattern only of rutile, said composition consisting essentially of from 92% to 99% by weight of TiO 2 , from 0.05% to 2% by weight of Al 2 O 3 and from 0.1% to 6% by weight of antimony oxide, calculated as Sb 2 O 3 .
Claim 3
Dependent Claim
24 words
The pigment composition according to claim 1 wherein the weight ratio of antimony oxide to Al 2 O 3 is from 0.5:1 to 3:1.
Claim 4
Dependent Claim
36 words
The pigment composition according to claim 1 wherein the pigment composition consists essentially of 97% by weigh of TiO 2 , 1% by weight of Al 2 O 3 and 2% by weight of antimony oxide.
Claim 5
Dependent Claim
86 words
A process comprising contacting a rutile TiO 2 pigment having from 0.05% to 2% by weight of Al 2 O 3 incorporated therein, but which has a structure that is complete rutile, with Sb 2 O 5 , Sb(OH) 3 , Sb(OH) 5 , Sb 2 O 3 , or partially neutralized products from SbCl 3 and SbCl 5 , and heat treating the resulting composition at a temperature from 300° to 1500° C. to form a TiO 2 pigment composition having only a rutile structure.
Claim 6
Dependent Claim
86 words
A process comprising contacting a rutile TiO 2 pigment having from 0.05% to 2% by weight of Al 2 O 3 incorporated therein, but which has a structure that is complete rutile, with Sb 2 O 5 , Sb(OH) 3 , Sb(OH) 5 , Sb 2 O 3 , or partially neutralized products from SbCl 3 and SbCl 5 , and heat treating the resulting composition at a temperature from 300° to 1500° C. to form a TiO 2 pigment composition having only a rutile structure.
Claim 7
Dependent Claim
55 words
Process according to claim 4 wherein Sb(OH) 3 or partially neutralized SbCl 3 is contacted with the TiO 2 pigment by forming an aqueous slurry of SbCl 3 and TiO 2 pigment and increasing the pH of the slurry to precipitate the Sb(OH) 3 or partially neutralized products on the surface of TiO 2 pigment.
Claim 8
Dependent Claim
55 words
Process according to claim 4 wherein Sb(OH) 5 or partially neutralized SbCl 5 is contacted with the TiO 2 pigment by forming an aqueous slurry of SbCl 5 and TiO 2 pigment and increasing the pH of the slurry to precipitate the Sb(OH) 5 or partially neutralized products on the surface of TiO 2 pigment.
Claim 9
Dependent Claim
35 words
Process according to claim 4 wherein the TiO 2 pigment composition is prepared by intimately mixing TiO 2 pigment with particulate Sb 2 O 3 and heating at a temperature from 300° to 650° C.
Claim 10
Dependent Claim
43 words
Process according to claim 4 wherein the TiO 2 pigment composition is prepared by intimately mixing TiO 2 pigment and at least one of SbCl 3 and SbCl 5 in the presence of moisture and at a temperature from 300° to 650° C.
Claim 11
Dependent Claim
46 words
Process according to claim 4 wherein the TiO 2 pigment containing Al 2 O 3 is in the form of a 50-70 weight percent aqueous pigment slurry and the Sb 2 O 3 is in the form of a 20-50 weight percent aqueous antimony oxide slurry.
Claim 12
Dependent Claim
9 words
Product obtained according to the process of claim 9.
Claim 13
Dependent Claim
35 words
Process according to claim 4 wherein the TiO 2 pigment and Sb 2 O 3 are contacted and simultaneously heat treated at a temperature of from 650°-1500° C. for a period of from 5-30 seconds.
Claim 14
Dependent Claim
9 words
Product obtained according to the process of claim 11.
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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) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |