A process for the preparation of an oxiditively stabilized polymer composition

摘要

Oxidatively stabilized polyolefin polymers containing an antioxidant are made more resistant to loss of antioxidant by converting at least some of the antioxidant comprising a polymer of dicyclopentadiene and a phenolic compound into a form non extractable with cyclohexane. The conversion is preferably by reaction in the melt phase in the presence of a radical initiator. Addition of organotin esters, sulphides, oxides or thioethers reduces the colour.