Patent ID: 8501846

Claim:
A stabilizer composition, comprising: (a) a hindered arylalkyl phosphite compound according to formula (I), wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 are each individually selected from hydrogen, C 1 -C 12 alkyl, C 3 -C 12 cycloalkyl, C 4 -C 12 alkyl cycloalkyl, C 6 -C 10 aryl, and C 7 -C 12 alkylaryl; wherein R 1 and R 5 together comprise at least 5 carbons and at least one of R 1 and R 5 comprises a tertiary carbon; wherein R 6 and R 10 together comprise at least 5 carbons and at least one of R 6 and R 10 comprises a tertiary carbon; (b) a trisarylphosphite of the formula (III), wherein R 16 , R 17 , R 18 , R 19 , and R 20 are each individually selected from hydrogen, C 1 -C 20 alkyl, C 3 -C 20 cycloalkyl, C 4 -C 20 alkyl cycloalkyl, C 6 -C 10 aryl, and C 7 -C 20 alkylaryl; and (c) a hindered phenol comprising a molecular fragment selected from formulas (IVa), IVb) and (IVc), wherein R 21 is selected from hydrogen and C 1-3 alkyl; and wherein R 22 and R 23 are each individually selected from hydrogen, C 1 -C 20 alkyl, C 3 -C 20 cycloalkyl, C 4 -C 20 alkyl cycloalkyl, C 6 -C 10 aryl, and C 7 -C 20 alkylaryl, with the proviso that the hindered phenol is not 1,1,3-tris-(5-tert-butyl-4-hydroxy-2-methylphenyl)-butane.