Process for purifying rubbery polymers

摘要

A process for purifying a rubbery polymer by removing a catalyst residue from a rubbery polymer containing the catalyst residue obtained by polymerizing in slurry ethylene and an alpha -olefin or ethylene, an alpha -olefin and a non-conjugated diene in a poor solvent with a catalyst consisting of an organoaluminum compound and a transition metal compound, characterized in that the removal of the catalyst residue is conducted by water extraction consisting of (1) adding a good solvent and a surface active agent to the polymer slurry in the first step, and (2) adding water to the slurry obtained in above (1) in second step. This process enables the catalyst residue to be removed from EPDM in a very high efficiency.