Polymer compositions containing talc filler, polar organic compound and antioxidant
Abstract
Abstract IN POLYPROPYLENE COMPOSITIONS CONTAINING SUBSTANTIAL AMOUNTS OF TALC AS FILLER, THE TALC SERIOUSLY DECREASES THE OXIDATION STABILITY OF COMPOSITIONS CONTAINING CONVENTIONAL ANTIOXIDANT SYSTEMS. IT HAS BEEN FOUND THAT THIS DEGRADING EFFECT IS DUE TO SELECTIVE SORPTION OF THE ANTIOXIDANTS ON THE TALC WHILE THE POLYMER COMPOSITION IS MELTED, AS IT NORMALLY IS DURING SOME STAGES OF PROCESSING. ACCORDING TO THIS INVENTION, THE STABILITY OF TALC-FILLED POLYPROPYLENE OR OTHER HYDROCARBON POLYMER COMPOSITIONS IS PRESERVED BY INCLUDING AS A "TALC-DEACTIVATOR" A POLAR ORGANIC COMPOUND WHICH IS SELECTIVELY SORBED ON THE TALC TO THE SUBSTANTIAL EXCLUSION OF THE ANTIOXIDANTS PRESENT IN THE COMPOSITON, WHILE NOT EXERTING A DEGRADING ACTION ON THE POLYMER COMPOSITION.
Inventors
- 👤 Evelyn G Gilfillan
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |