Rutile titanium dioxide pigment for paper laminates
Abstract
Abstract IN A PROCESS OF TREATING RUTILE TITANIUM DIOXIDE PIGMENT BY (A) MIXING TITANIUM DIOXIDE AND A SILICATE IN WATER FORMING A SLURRY; (B) NEUTRALIZING THE SLURRY TO OBTAIN A PH VALUE OF ABOUT 5-8, AT A TEMPERATURE OF ABOUT 50-70* C.; (C) ADDING A SOLUBLE ZINC SALT TO THE MIXTURE AND ADJUSTING THE PH OF THE MIXTURE TO A LEVEL OF ABOUT 6.5-7.5; (D) ISOLATING THE TREATED PIGMENT FROM THE MIXTURE; (E) CALCINING THE ISOLATED PIGMENT; AND (F) DRY-GRINDING THE CALCINED PIGMENT, THE LIGHT STABILITY OF THE PIGMENT AND THE ABILITY OF THE PIGMENT TO BE RETAINED BY PAPER PULP IN THE MANUFACTURE OF PAPER IS IMPROVED BY RAPIDLY ADDING SULFURIC ACID HAVING A CONCENTRATION OF 50-96 PERCENT TO THE SLURRY OF PIGMENT AND SILICATE, REDUCING THE PH OF THE SLURRY TO A VALUE OF 5 OR LESS AND EFFECTING RAPID PRECIPITATION OF SILICA.
Inventors
- 👤 Alfred John Werner
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |