Abstract: A process for deactivating an active catalyst species in an olefin polymer stream exiting a polymerization reactor and neutralizing catalyst residues, as well as reducing corrosion, plugging or fouling of olefin production and recovery equipment and imparting antioxidative properties to an olefin polymer comprising adding a catalyst deactivator and an alkaline earth metal salt of a phosphoric- or phosphonic acid to an olefin polymer stream exiting a polymerization reactor, each in a quantity at least sufficient to deactivate active catalytic species in the polymer stream and neutralize catalyst residues, respectively, and subsequently recovering the resulting polymer product.

Abstract: A process for deactivating an active catalyst species in an olefin polymer stream exiting a polymerization reactor and neutralizing catalyst residues comprising adding to the olefin polymer stream in a quantity at least sufficient to inactivate the catalyst species and neutralize catalyst residues a composition comprising an ionomer having a molecular weight of at least 100 g/mol, and subsequently recovering the resulting polymer product.