PREPARATION METHOD OF AROMATIC COPOLYMER HAVING MONOVINYL GROUP TO REDUCE AMOUNT OF INITIATOR AND TO OBTAIN RELIABLE QUALITY

摘要

PURPOSE: A method for preparing an aromatic copolymer having a monovinyl group is provided, to reduce the amount of an initiator and to simplify the reaction process by charging monomers in the reaction system for several times and adding an initiator only at initiation step. CONSTITUTION: The method comprises the steps of mixing an aromatic monomer having a monovinyl group, and a solvent containing a butyllithium-type initiator and a catalyst in the reaction system; charging additional aromatic monomer having a monovinyl group and a diene monomer for allowing polymerization to be carried out continuously; optionally re-charging additional aromatic monomer having a monovinyl group and diene monomer for allowing the monomers to be consumed for several times; charging an aromatic monomer having a monovinyl group in the reaction system; and carrying out polymerization until there is no free monomer and terminating the reaction.