Purification of polymerized olefins prepared with catalysts containing vanadium compounds

In the preparation of polymers of olefinic compounds using a catalyst formed by admixing an organometallic compound and a vanadium compound, coloured vanadium constituents in catalysts residues present in the polymer are removed by first treating the polymer and residues with an oxidizing agent havi...

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Bibliographic Details
Main Authors FUJIOKA GEORGE S, MARINAK MICHAEL J
Format Patent
LanguageEnglish
Published 19.03.1968
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:In the preparation of polymers of olefinic compounds using a catalyst formed by admixing an organometallic compound and a vanadium compound, coloured vanadium constituents in catalysts residues present in the polymer are removed by first treating the polymer and residues with an oxidizing agent having a pH below 9 in an amount sufficient to oxidize the vanadium constituent to the vanadium (V) state and the convert the oxidized vanadium constituent to the vanadate salt form with a solution of an alkaline compound at a pH between 9 and 14. Oxidizing agents include nitrites, persulphates, peroxides, and hypochlorites. Alkaline compounds include alkali metal hydroxides, and alkaline nitrogenous compounds such as ammonia and amines. Exemplified polymers are copolymers of ethylene and propylene or C6-C7 alpha-olefins.
Bibliography:Application Number: US19650471432