US3941603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
TiO2 Pigment for industrial paints based on water reducible systems
Assignee: EIDP Inc
•
Filing: 1974-02-01
•
Granted: 1976-03-02
•
Expires: 1994-02-01
Abstract
Abstract Rutile TiO 2 is coated successively with precipitates of titania and alumina, the weight ratio of titania:alumina being about 0.5:1 to 1:1 and the total percentage of titania and alumina being about 7 to 8%, based on the weight of said rutile TiO 2 . The pigment is especially suited for use in industrial paints, e.g., automotive and appliance coatings, which are based on water reducible systems.
Inventors
- 👤 Paul Gordon Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:49
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
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
A new pigment composition exhibiting a high level of hiding power, gloss and dispersibility comprising: rutile TiO 2 coated successively and separately with a precipitate of titania and a precipitate of alumina, the weight ratio of titania:alumina being about 0.5:1 to 1:1 and the total percentage of titania and alumina being about 7 to 8%, based on the weight of said rutile TiO 2 .
Claim 2
Dependent Claim
65 words
A new pigment composition exhibiting a high level of hiding power, gloss and dispersibility comprising: rutile TiO 2 coated successively and separately with a precipitate of titania and a precipitate of alumina, the weight ratio of titania:alumina being about 0.5:1 to 1:1 and the total percentage of titania and alumina being about 7 to 8%, based on the weight of said rutile TiO 2 .
Claim 3
Dependent Claim
21 words
Pigment according to claim 1 wherein the weight percentage of titania is 3% and the weight percentage of alumina is 4%.
Claim 4
Dependent Claim
154 words
Method for producing a new pigment composition exhibiting a high level of hiding power, gloss and dispersibility which comprises the following steps: a. forming an aqueous slurry of rutile TiO 2 having a pH below about 4, b. adding to the slurry a quantity of TiCl 4 in a predetermined amount, c. adjusting the pH of the slurry to within a value of about 6-9, d. adding to the slurry a quantity of an aqueous alkali metal aluminate solution in a predetermined amount, while raising the pH to at least about 10, e. adjusting the pH of the slurry to within a value of about 6-9, and f. recovering and washing the resultant pigment; the said predetermined amounts of TiCl 4 and alkali metal aluminate solution being such as to provide a weight ratio of titania:alumina of about 0.5:1 to 1:1 and the total percentage of titania and alumina being about 7 to 8%.
Claim 5
Dependent Claim
154 words
Method for producing a new pigment composition exhibiting a high level of hiding power, gloss and dispersibility which comprises the following steps: a. forming an aqueous slurry of rutile TiO 2 having a pH below about 4, b. adding to the slurry a quantity of TiCl 4 in a predetermined amount, c. adjusting the pH of the slurry to within a value of about 6-9, d. adding to the slurry a quantity of an aqueous alkali metal aluminate solution in a predetermined amount, while raising the pH to at least about 10, e. adjusting the pH of the slurry to within a value of about 6-9, and f. recovering and washing the resultant pigment; the said predetermined amounts of TiCl 4 and alkali metal aluminate solution being such as to provide a weight ratio of titania:alumina of about 0.5:1 to 1:1 and the total percentage of titania and alumina being about 7 to 8%.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |