| abstract |
[PROBLEMS] To produce a polymer with high energy efficiency by adding a phenolic antioxidant excellent in color tone and stability of the obtained polymer before polymerization without affecting the catalyst activity even if added before polymerization. To provide a process for producing a stabilized polymer. When polymerizing a monomer having an ethylenically unsaturated bond, one or more specific phenolic antioxidants masked with organoaluminum are added to the catalyst system or the polymerization system before or during the polymerization. A method for producing a stabilized polymer. [Selection figure] None |