| http://www.w3.org/ns/prov#value | - U.S. Pat. Nos. 4,260,661 and 4,824,883 disclose using an antioxidant system comprising a combination of a zinc salt of a mercaptoimidazole with a sterically hindered di-tertiary butyl phenol in polyolefin polymers and compounds thereof, such as polyethylene and copolymers of ethylene and other polymerizable materials.
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