Production of pigmentary grade colorants
Abstract
Abstract CRUDE COLARANTS, PRIOR TO SALT GRINDING, ARE SUBJECTED TO ATTRITIONING AND SHEARING ACTIONS TO BREAK DOWN CRYSTALLINE STRUCTURE TO NON-PIGMENTARY, FLOCCULENT FORM. THE TIME REQUIRED FOR SALT GRINDING IS REDUCED, AND A STRONGER PIGMENTARY GRADE PRODUCT IS OBTAINED. WHEN BLUE SHADE PHTHALOCYANINE CRUDE IS SO TREATED AND THE SALT GRINDING IS CARRIED OUT IN THE PRESENCE OF CERTAIN NON-AROMATIC ORGANIC LIQUIDS, A CRYSTALLIZING RED SHADE PHTHALOCYANINE BLUE IS OBTAINED INSTEAD OF THE CUSTOMARY GREEN SHADE PRODUCT OBTAINED BY CONVENTIONAL SALT GRINDING OF THE PARTICULAR CRUDE COLORANT. A NON-CRYSTALLIZING RED SHADE PHTHALOCYANINE BLUE PIGMENT IS OBTAINED WHEN A PARTLY CHLORINATED PHTHALOCYANINE CRUDE IS THUS TREATED.
Inventors
- 👤 Geoffrey R Buckwalter
Bibliographic Details
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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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |