Patent ID: 7649079

Claim:
A method for removing metallic ruthenium from a polymer produced using a ruthenium complex as the polymerization catalyst or a polymer solution obtained following recovery of the polymer, wherein the metallic ruthenium is incorporated within a ruthenium complex having a ruthenium metal core surrounded by ligands, comprising: adding a compound selected from the group consisting of nitrile compounds and (alkyl)phosphorus-based compounds, that is capable of coordinating with ruthenium via a substitution of a ligand of said ruthenium complex, thereby precipitating another ruthenium complex in which a ligand has been substituted, wherein the quantity added of the compound that is capable of coordinating with ruthenium via a substitution of a ligand of said ruthenium complex is within a range from 1 to 100 molar equivalents relative to the ruthenium complex.