Unsymmetrical phosphite-phenolic isocyanurate stabilizer combina

Details Unsymmetrical phosphite-phenolic isocyanurate stabilizer combina Unsymmetrical phosphite-phenolic isocyanurate stabilizer combina

1982-11-24

1984-04-24

Kight, III, John

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

Synthetic resins

Processes of preparing a desired or intentional composition...

252400R, 260967, 524151, C08K 534, C08K 552

Patent

active

044449291

ABSTRACT:
Sterically hindered 4-substituted-2,6-di-t-butylphenyl bis (substituted phenyl)phosphites form effective and improved antioxidant combinations with hydroxyphenylalkyleneyl isocyanurates. These systems provide enhanced antioxidant activity activity in organic materials subject to degradation by heat and oxygen, and are especeially effective in polymers such as the poly(olefins) represented by poly(propylene). The triphenyl phosphites are readily prepared by reacting a 2,6-di-t-butyl-4-substituted-phenylphosphorodichloridite with a sodium salt of a 2-t-butyl-substituted phenol.

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