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US 4,007,230 AGranted
Antioxidant composition for stabilizing polyols
AssigneeThe Dow Chemical Company
InventorKenneth J. Hinze
Life of this patent
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Abstract
Synergistic antioxidant compositions consisting of certain hindered phenols such as 2,4-dimethyl-6-octyl phenol and 4,4'-bis (.alpha.,.alpha.-dimethylbenzyl) diphenyl amine are useful to stabilize polyether polyols against oxidative degradation and prevent scorch in polyurethane foams prepared from the polyether polyols.
Claims9
A polyether polyol or mixture of such polyols containing as a stabilizer against oxidative degradation from about 500 to about 100,000 ppm of an antioxidant composition containing:
- A. from about 15 to about 85 percent by weight of a phenolic antioxidant selected from the group consisting of
- 2,4-dimethyl-6-octyl phenol,
- 2,6-ditertiarybutyl-4-methyl phenol,
- 2,6-ditertiarybutyl-4-ethyl phenol,
- 2,6-ditertiarybutyl-4-n-butyl phenol,
- 2,2'-methylenebis (4-methyl-6-tertiarybutyl phenol),
- 2.
4 more elements
Dependencies are inferred from the claim text.