Stabilized polymers and their preparation
AssigneeBP Chemicals Limited
InventorsNeil S. Davidson, Hilda A. Leiper, Colette A. A. Di Murro, Kenneth Wilkinson
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Abstract
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 color.
Claims15
An oxidatively stabilized melt processable polymer composition comprising an olefin polymer and an antioxidant which comprises a polymer of dicyclopentadiene and a phenolic compound, said antioxidant having been reacted with said olefin polymer so that at least some of the antioxidant is in a form non-extractable with cyclohexane.
A method of making an oxidatively stabilized polymer composition comprising an olefin polymer and antioxidant characterised by reacting in the presence of a radical initiator and in the melt phase, said olefin polymer with antioxidant, which is a polymer of dicyclopentadiene and a phenolic compound.
Dependencies are inferred from the claim text.