| US 7,468,410 B2 | ||
| Stabilization of polyolefins with liquid tris-(mono-alkyl)phenyl phosphites | ||
| Laura F. Chafin, Bologna (Italy); Walid Al-Akhdar, Mobile, Ala. (US); Sai Ping Shum, Pleasantville, N.Y. (US); Stanley J. Padegimas, Mobile, Ala. (US); and Roswell Easton King, Pleasantville, N.Y. (US) | ||
| Assigned to Ciba Specialty Chemicals Corporation, Tarrytown, N.Y. (US) | ||
| Filed on Jul. 17, 2006, as Appl. No. 11/487,839. | ||
| Claims priority of provisional application 60/701279, filed on Jul. 21, 2005. | ||
| Prior Publication US 2007/0021537 A1, Jan. 25, 2007 | ||
| Int. Cl. C08K 5/524 (2006.01) | ||
| U.S. Cl. 524—128 [524/585; 524/587] | 18 Claims |
| 1. A process for stabilizing a polyolefin against the deleterious effects of melt processing, heat aging and exposure to combustion
products-of natural gas, which process comprises
incorporating into or applying to said polyolefin
an effective stabilizing amount of a mixture of at least two different
tris-(mono-alkyl)phenyl phosphite esters of the formula l,
 where each R is the same or different and is a straight or branched chain alkyl of from 1 to 8 carbon atoms, and where said
mixture of phosphite esters is in the liquid state at 25° C. and 1 atm of pressure.
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