Patent ID: 7897720

Claim:
A method for removing a metallic compound catalyst residue from a polymer solution, comprising the steps of: a) mixing a polymer solution, which is prepared using a catalyst containing a metal of Group 10, and an organic thiourea compound as represented by Formula 1 to form a chelate compound of the organic thiourea compound with the metallic compound catalyst residue within the polymer solution; and b) adding the polymer solution containing the chelate compound formed therein to a polar solvent, adding the polar solvent to the polymer solution to dissolve the chelate compound while a polymer is precipitated and then filtered; or adding a filtering agent to the polymer solution containing the chelate compound therein to filter the chelate compound, wherein the method further comprises adding an acid to the polymer solution before the thiourea compound is added during step a), wherein R1, R2, R3, and R4 are each independently any one selected from the group consisting of hydrogen; halogen; linear or branched alkyl that has 1 to 20 carbon atoms and is substituted or unsubstituted with one or more substituent groups selected from the group consisting of halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, and haloalkynyl; linear or branched alkenyl that has 2 to 20 carbon atoms and is substituted or unsubstituted with one or more substituent groups selected from the group consisting of halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, and haloalkynyl; linear or branched alkynyl that has 2 to 20 carbon atoms and is substituted or unsubstituted with one or more substituent groups selected from the group consisting of halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, and haloalkynyl; cycloalkyl that has 3 to 12 carbon atoms and is substituted or unsubstituted with one or more substituent groups selected from the group consisting of halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, and haloalkynyl; aryl that has 6 to 40 carbon atoms and is substituted or unsubstituted with one or more substituent groups selected from the group consisting of halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, and haloalkynyl; aralkyl that has 7 to 15 carbon atoms and is substituted or unsubstituted with one or more substituent groups selected from the group consisting of halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, and haloalkynyl; alkoxy or aminoalkyl containing oxygen and nitrogen atoms; and an amine group containing an alkyl group or an aryl group.