Patent ID: 7361703
Filing Date: 2008-04-22
Classification: C08K

Abstract:
1. A process for stabilizing a thermoplastic polyolefin during melt processing conditions said process comprising the step of incorporating into said thermoplastic polyolefin a stabilizer package comprising: (i) at least one aryl monophosphite; and (ii) at least one diphosphite, and subjecting said thermoplastic polyolefin to sufficient temperature to melt said polyolefin; with the proviso that said stabilizer package is essentially free of any additive selected from the group consisting of hindered phenolic antioxidants, lactone stabilizers and hydroxylamine stabilizers; wherein said thermoplastic polyolefin is a linear polyethylene which contains from 0.5 to 10 ppm of at least one transition metal selected from the group consisting of titanium, vanadium, zirconium and chromium.