abstract |
The present invention relates to a styrenic quaternary copolymer comprising (A) an aromatic vinyl monomer, (B) an unsaturated nitrile monomer, (C) an N-substituted maleimide monomer and (D) an alpha -alkylstyrene monomer, ≪ / RTI > The styrene-based quaternary copolymer has advantages of lowering the reaction temperature by using suspension polymerization and shortening the reaction time, thereby maximizing the productivity. |