A stabilized high-vinyl polybutadiene composition comprising a high-vinyl polybutadiene, and an antioxidant defined by the formula ##STR00001## where each R.sup.1 and R.sup.2, which may be the same or different, are mono-valent organic groups, or where each R.sup.1, which may be the same or different, is a mono-valent organic group and the two R.sup.2 groups join to form a divalent organic group.

 
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> Synthetic plastic material and a method of making thereof

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