Pearlescent pigment
Abstract
Abstract MICA PLATELETS ARE COATED WITH BISMUTH OXYCHLORIDE CRYSTALS TO PROVIDE PEARLESCENT PIGMENTS WHICH ARE ESPECIALLY USEFUL IN COSMETIC APPLICATIONS. THE PIGMENTS ARE PRODUCED BY IMPREGNATING MICA PLATELETS WITH HYDROCHLORIC ACID, FOLLOWED BY HYDROLYSIS OF BISMUTH TRICHLORIDE IN THE PRESENCE OF THE PALATELETS. THE HYDROLYSIS REACTION IS EFFECTED WHILE THE IMPREGNATED PLATELETS ARE SUSPENDED IN AN AQUEOUS CRYSTALLIZATION MEDIUM, AND HYDROLYSIS RESULTS IN THE FORMATION OF BISMUTH OXYCHLORIDE CRYSTALS WHICH DEPOSIT ON THE SURFACE OF THE MICA. IN PREFERRED EMBODIMENTS OF THE PROCESS, BISMUTH TRICHLORIDE IS CONTAINED IN THE HYDROCHLORIC ACID WITH WHICH THE MICA IS IMPREGNATED. IN COMPARISON TO CONVENTIONAL BISMUTH OXYCHLORIDE PIGMENTS WHICH CONTAIN NO MICA, THESE NEW PRODUCTS ARE SUPERIOR IN MANY RESPECTS, AND EQUIVALENT PERARLESCENCE AND OPACITY CAN BE PROVIDED BY A SUBSTANTIALLY LESSER AMOUNT OF BISMUTH OXYCHLORIDE.
Inventors
- 👤 N Mullio
Bibliographic Details
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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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |