Textile fibers, films, shaped articles and the like particularly stable to heat, light and ageing
Abstract
Abstract Stabilized poly-alpha-olefin compositions comprising polymer and up to 5 percent by weight thereof of stabilizing mixture of: A. A THIOESTER DERIVED FROM THIODIPROPIONIC ACID OR FROM BISBeta -HYDROXYETHYL SULFIDE (THIODIGLYCOL); B. A PHOSPHITE HAVING THE FORMULA: WHEREIN X is oxygen or sulfur and R, R'', R'''' are the same or different radicals selected from the group consisting of unsubstituted or hydroxy substituted alkyl, aryl and alkylaryl radicals; C. A PHENOLIC ANTIOXIDIZING AGENT; D. AN ORGANOTIN COMPOUND; E. A METALLIC SOAP, SELECTED FROM THE GROUP CONSISTING OF THE STEARATES OF Ca, Mg and the like; and optionally a basic nitrogen containing polymer. 2. Description of the Prior Art Various compounds are known to stabilize poly-alpha-olefins against the deleterious effects of heat and/or light and/or ageing. No one of these compounds, nor any mixture thereof known to me, has given the surprising degree of stabilization afforded by the particular combination of ingredients comprising the stabilizing mixture of the present invention.
Inventors
- 👤 Millo Branchesi
Bibliographic Details
Claims Analysis
Total Claims: 6References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |