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Abstract

The present disclosure provides a method to improve the optical properties of an ethylene copolymer composition which is made in a multi reactor solution phase polymerization process. A single site catalyst is employed in a first polymerization reactor and a multi-site catalyst is employed in a second polymerization reactor arranged in series with the first polymerization reactor. The method involves increasing the amount of alpha olefin fed to a second polymerization reactor relative to the amount of alpha olefin fed to a first polymerization reactor, and if desired, optimizing other process conditions across the two reactors, such as the overall alpha-olefin to ethylene ratio, the polymerization temperature of the reactors, and the amount of hydrogen fed to each reactor, in order to maintain the density and the melt index of the ethylene copolymer composition.

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First Claim