US3329484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titanium dioxide pigment and method for preparation thereof
Assignee: Dow Chemical Co
•
Filing: 1966-09-15
•
Granted: 1967-07-04
•
Expires: 1986-09-15
Abstract
No abstract record available.
Inventors
- 👤 Ray S Long
- 👤 David A Ellis
- 👤 Kenneth E Cox
- 👤 James E Magner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:30
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C09; C09C; C09C1/00; C09C1/36; C09C1/3607; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/053; C01G23/0536; C01G23/0538; C01P; C01P2004/00; C01P2004/54; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
A PIGMENT GRADE, MONOCRYSTALLINE, ACICULAR, RUTILE TITANIUM DIOXIDE HAVING A CROSS-SECTIONAL DIAMETER OF FROM ABOUT 0.05 TO ABOUT 0.2 MICRON, A LENGTH OF FROM ABOUT 0.3 TO ABOUT 1.5 MICRONS AND FURTHER CHARACTERIZED IN THAT THE RATIO OF LENGTH TO CROSS SECTIONAL DIAMETER IS FROM ABOUT 3 TO ABOUT 15 SAID TITANIUM DIOXIDE HAVING A TINTING STRENGTH OF AT LEAST ABOUT 900.
Claim 2
Dependent Claim
62 words
A PIGMENT GRADE, MONOCRYSTALLINE, ACICULAR, RUTILE TITANIUM DIOXIDE HAVING A CROSS-SECTIONAL DIAMETER OF FROM ABOUT 0.05 TO ABOUT 0.2 MICRON, A LENGTH OF FROM ABOUT 0.3 TO ABOUT 1.5 MICRONS AND FURTHER CHARACTERIZED IN THAT THE RATIO OF LENGTH TO CROSS SECTIONAL DIAMETER IS FROM ABOUT 3 TO ABOUT 15 SAID TITANIUM DIOXIDE HAVING A TINTING STRENGTH OF AT LEAST ABOUT 900.
Claim 3
Dependent Claim
239 words
A PROCESS FOR PREPARING A PIGMENT GRADE, ACICULAR, RUTILE THANIUM DIOXIDE PRODUCT WHICH COMPRISES; (A) ADMIXING AN AQUEOUS TURBID, BLUISH-COLORED, OPALESCENT COLLOIDAL SUSPENSION OF TITANIUM DIOXIDE NUCLEATING SEED PARTICLES WITH AN ACIDIC TITANIUM CHLORIDE SOLUTION HAVING A MINIMUM CHLORIDE/ TITANIUM RATIO OF 4, A MINIMUM HYDROGEN ION/ TITANIUM RATIO OF 4, AND A TITANIUM CONCENTRATION OF FROM ABOUT 15 TO ABOUT 85 GRAMS PER LITER, THE TITANIUM DIOXIDE NUCLEATING SEED PARTICLES IN SAID SUSPENSION HAVING DIAMETERS RANGING FROM ABOUT 0.002 TO ABOUT 0.01 MICRON, SAID COLLOIDAL SUSPENSION PROVIDING FROM ABOUT 4 TO ABOUT 10 WEIGHT PERCENT OF THE TITANIUM VALUES IN THE RESULTING ADMIXTURE AND SAID COLLOIDAL SUSPENSION BEING PREPARED BY HEATING AN AQUEOUS TITANIUM CHLORIDE SOLUTION HAVING A CHLORIDE/TITANIUM RATIO OF FROM ABOUT 1.5 TO ABOUT 4, A PH OF FROM ABOUT 0.3 TO ABOUT 0.7 AND A TITANIUM CONCENTRATION OF FROM ABOUT 8 TO ABOUT 30 GRAMS PER LITER, (B) HEATING SAID ADMIXTURE AT A MINIMUM TEMPERATURE OF ABOUT 190*C. UNDER AUTOGENOUS PRESSURE TO HYDROLYZE THE TITANIUM CHLORIDE PRESENT THEREIN AND PRECIPITATE THE TITANIUM VALUES THEREIN AS A PIGMENT GRADE, ACICULAR, RUTILE TITANIUM DIOXIDE PRODUCT HAVING A CROSS-SECTIONAL DIAMETER OF FROM ABOUT 0.05 TO ABOUT 0.2 MICRON, A LENGTH OF FROM ABOUT 0.3 TO ABOUT 1.5 MICRONS AND FURTHER CHARACTERIZED IN THAT THE RATIO OF LENGTH TO CROSS-SECTIONAL DIAMETER IS FROM ABOUT 3 TO ABOUT 15, AND (C) SEPARATING SAID PRECIPITATED TITANIUM VALUES FROM THE REACTION MIXTURE.
Claim 4
Dependent Claim
239 words
A PROCESS FOR PREPARING A PIGMENT GRADE, ACICULAR, RUTILE THANIUM DIOXIDE PRODUCT WHICH COMPRISES; (A) ADMIXING AN AQUEOUS TURBID, BLUISH-COLORED, OPALESCENT COLLOIDAL SUSPENSION OF TITANIUM DIOXIDE NUCLEATING SEED PARTICLES WITH AN ACIDIC TITANIUM CHLORIDE SOLUTION HAVING A MINIMUM CHLORIDE/ TITANIUM RATIO OF 4, A MINIMUM HYDROGEN ION/ TITANIUM RATIO OF 4, AND A TITANIUM CONCENTRATION OF FROM ABOUT 15 TO ABOUT 85 GRAMS PER LITER, THE TITANIUM DIOXIDE NUCLEATING SEED PARTICLES IN SAID SUSPENSION HAVING DIAMETERS RANGING FROM ABOUT 0.002 TO ABOUT 0.01 MICRON, SAID COLLOIDAL SUSPENSION PROVIDING FROM ABOUT 4 TO ABOUT 10 WEIGHT PERCENT OF THE TITANIUM VALUES IN THE RESULTING ADMIXTURE AND SAID COLLOIDAL SUSPENSION BEING PREPARED BY HEATING AN AQUEOUS TITANIUM CHLORIDE SOLUTION HAVING A CHLORIDE/TITANIUM RATIO OF FROM ABOUT 1.5 TO ABOUT 4, A PH OF FROM ABOUT 0.3 TO ABOUT 0.7 AND A TITANIUM CONCENTRATION OF FROM ABOUT 8 TO ABOUT 30 GRAMS PER LITER, (B) HEATING SAID ADMIXTURE AT A MINIMUM TEMPERATURE OF ABOUT 190*C. UNDER AUTOGENOUS PRESSURE TO HYDROLYZE THE TITANIUM CHLORIDE PRESENT THEREIN AND PRECIPITATE THE TITANIUM VALUES THEREIN AS A PIGMENT GRADE, ACICULAR, RUTILE TITANIUM DIOXIDE PRODUCT HAVING A CROSS-SECTIONAL DIAMETER OF FROM ABOUT 0.05 TO ABOUT 0.2 MICRON, A LENGTH OF FROM ABOUT 0.3 TO ABOUT 1.5 MICRONS AND FURTHER CHARACTERIZED IN THAT THE RATIO OF LENGTH TO CROSS-SECTIONAL DIAMETER IS FROM ABOUT 3 TO ABOUT 15, AND (C) SEPARATING SAID PRECIPITATED TITANIUM VALUES FROM THE REACTION MIXTURE.
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) | 1970-07-03 | 1971-01-02 | 1971-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-03 | 1975-01-02 | 1975-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-03 | 1979-01-02 | 1979-07-04 | $7700.00 | Window Closed / Lapsed |