Patent ID: 7875663
Filing Date: 2011-01-25
Classification: C08K,C08L,E04F,E04G

Abstract:
1. A polyolefin composition which comprises: (a) a polyolefin containing transition metal catalyst residue (excluding metallic co-catalyst residues) at a level below 5 ppm based on the weight of the polyolefin; (b) a first stabilising component consisting of a phenolic antioxidant or a mixture of phenolic antioxidants selected from the group consisting of: 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione; 2,2′-methylenebis(6-t-butyl-4-methylphenol); 4,4′-bu-tylidenebis(2-t-butyl-5-methylphenol); 2,2′-isobutylidenebis(4,6-dimethylphenol); 1,1,3-tris(2′-methyl-4′-hydroxy-5′-t-butylphenyl)butane; 2,5-di-t-amylhydroquinone; 2,2′-methylene-bis(4-methyl)-6-(1-methyl cyclohexyl)phenol; 4,4′-thiobis(2-t-butyl-5-methylphenol); 2,2′-thiobis(6-t-butyl-4-methyl phenol); triethylene glycol bis[3-(3-t-butyl-4-hydroxy-5-methylphenyl)propionate], synthetic alpha-tocopherol, and mixed tocopherols as found in Vitamin E; (c) a second stabilising component consisting of a phosphite antioxidant or a mixture of phosphite antioxidants with the proviso that if the phosphite antioxidant is trilauryl phosphite it must be used in combination with another phosphite; and (d) a third stabilising component which acts also as a colour suppressant and which is a polyfunctional alcohol selected from the group consisting of erythritol, pentaerythritol, dipentaerythritol, sorbitol, triisopropanolamine and polypentaerythritols wherein stabilising components (b) and (c) are present in a ratio of between 1/1 and 1/20.