Patent ID: 7879928

Claim:
A process for preventing the formation of aldehydic contaminants in polyether polyols, polyester polyols or polyurethanes which comprises incorporating into said polyether polyols, polyester polyols or polyurethanes an effective amount of (a) a phenolic antioxidant, and (b) an aminic antioxidant, where the phenolic antioxidant is and where the aminic antioxidant is of formula (II) wherein R 25 is C 1 -C 18 alkyl, phenyl-C 1 -C 4 alkyl, C 5 -C 12 cycloalkyl, phenyl or naphthyl; or is phenyl or naphthyl each of which is substituted by C 1 -C 12 alkyl, C 1 -C 12 alkoxy, benzyl or α,α-dimethylbenzyl and R 26 is phenyl or naphthyl; or is phenyl or naphthyl each of which is substituted by C 1 -C 12 alkoxy, benzyl or α,α-dimethylbenzyl, or R 25 and R 26 form a radical of formula III wherein R 27 and R 28 are hydrogen or C 1 -C 18 alkyl and R 29 is hydrogen or R 27 and R 29 , taken together, form a group of formula