Liquid stabilizer compositions for polyols and polyurethane foam

Details Liquid stabilizer compositions for polyols and polyurethane foam Liquid stabilizer compositions for polyols and polyurethane foam

1992-06-16

1993-06-15

Hoke, Veronica P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

25218224, 25218227, 25218229, 252404, 252405, 521117, 521128, 524 83, 524258, 524291, C08K 547, C08K 518

Patent

active

052198928

ABSTRACT:
Polyether polyols and polyurethane foams are stabilized by including therein a stabilizer composition of (a) tetrakis[methylene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate)]methane and (b) a reaction product of diphenylamine and diisobutylene wherein the molar ratio of the amine to the diisobutylene is 1:1.1 to 1:2.5. The stabilizer composition may contain a third synergistic component, phenothiazine or certain alkyl derivatives of phenothiazine. The stabilizer composition may further contain trihydrocarbyl phosphite to stabilize the color of same.

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K. C. Frisch and J. H. Saunders, ed. Plastic Foams, Part 1, 118-125 (1972).
G. L. Statton and J. M. Gaul, Evaluation of Hindered Phenols for Minimization of Foam Discoloration using the Microwave Scorch Test, 20 J. Cellurac Plastics, 346-50 (1984).

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