The Dow Chemical Company

Kenneth J Hinze

Wayne R Willkomm

Ruben Solis

A polymer polyol is produced by a process comprising free radical polymerizing an addition polymerizable di-(substituted phenyl)monomer (e.g., methacrylic ester of diglycidylether of tetrabromobisphenol A) component in the presence of a polyol, wherein the monomer has at least one aromatic halogen and at least one aromatic ethylenically unsaturated substituent. The polymer polyol can also be made by copolymerizing said monomer with an additional ethylenically unsaturated monomer component such as styrene and acrylonitrile. Said polymer polyols are reacted with a polyisocyanate compound forming a flame retardant polyurethane foam.

Polymer polyols containing halogenated aromatic monomers and

Antioxidant compositions containing (a) a sterically hindered phenol, (b) 4,4'-bis(.alpha.,.alpha.-dimethylbenzyl) diphenyl amine and (c) a phenothiazine compound stabilize polyols against oxidative degradation and prevent urethane foams prepared therefrom from scorching.

Antioxidant compositions

Polyurethane foams are prepared from polyols stabilized against oxidative degradation with a synergistic combination of a sterically hindered phenol and 4,4'-bis(.alpha.,.alpha.-dimethylbenzyl)diphenyl amine in which a portion of either the phenol or the amine or a portion of both have been replaced with a phenothiazine compound.

Stabilization of polyether polyols and polyurethane foams prepared

Polyols stabilized against oxidative degradation with a synergistic combination of a sterically hindered phenol and 4,4'-bis(.alpha.,.alpha.-dimethylbenzyl)diphenyl amine are improved by replacing a portion of either the phenol or the amine or a portion of both with a phenothiazine compound.

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.

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Lake Jackson, TX, United States of America

Kenneth J Hinze