Thiobis phenolic antioxidant/polyethylene glycol blends
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorsAntoni Adamczyk, Daniel Emley, Neil W. Dunchus, Jeffrey M. Cogen, Susan Song
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Abstract
Thiobis phenolic antioxidants are efficiently dry or melt blended with a tree-resistant, crosslinkable polyethylene by first forming a blend, preferably a dry blend, of the antioxidant with a polyalkylene glycol (PAG), and then mixing the blend with the polyethylene. The incorporation of thiobis phenolic antioxidant and PAG blend into polyethylene provides the PE with high oxidative induction time (OIT) which is a measure of the oxidative stability of the PE.
Claims9
An additive mixture consisting essentially of at least one thiobis phenolic antioxidant and at least one polyalkylene glycol (PAG) of a weight average molecular weight of at least 1,000 in which the thiobis phenolic antioxidant and PAG are present at a thiobis phenolic antioxidant to PAG weight ratio from 0.1:1 to 2:1.
Dependencies are inferred from the claim text.