Process for obtaining narrow molecular weight distribution in vinyl aromatic mass polymerization system

摘要

In a process for the mass polymerization of vinyl aromatic monomer wherein vinyl aromatic monomer is polymerized in successive stages of increasing temperature, the improvement which narrows the molecular weight distribution of the resulting polymer comprising incorporating a crosslinking agent into a polymerizing mass at a point where about 60 to about 95% of monomer is converted to polymer.