Manufacture of pigments
Abstract
Abstract CRUDE ORGANIC SOLID PARTICLES ARE CONDITIONED TO DEVELOP PIGMENTARY PROPERTIES. A PARTIAL MILLING STEP IN WHICH THE CRUDE PIGMENT IS SUBJECTED TO PARTICLE SIZE REDUCTION BY DRY MILLING TO AN EXTENT LESS THAN THAT ORDINARILY REQUIRED TO DEVELOP FULL TINCTORIAL STRENGTH IS FOLLOWED BY A BREACHING TREATMENT IN WHICH THE PARTIALLY MILLED PIGMENT IS CONTACTED WITH A PHENOL BREACHING AGENT TO FURTHER CONDITION THE PIGMENT. THE RESULTING PIGMENT HAS TINCTORIAL STRENGTH SUBSTANTIALLY EQUAL TO THAT OBTAINED BY FULLY MILLING THE CRUDE PARTICLES WITHOUT THE BREACHING TREATMENT. THE PHENOL BREACHING AGENT MAY BE SEPARATED FROM THE CONDITIONED PIGMENT BY TREATMENT WITH A SOLUBILIZING BASE. THIS PROCESS IS USEFUL IN THE MANUFACTURE OF PHTHALOCYANINES, QUINACRIDONES, ETC., WITH SUBSTANTIAL IMPROVEMENT IN EQUIPMENT UTILIZATION IN MILLING.
Inventors
- 👤 R Flores
Bibliographic Details
Claims Analysis
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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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |