Patent ID: 6767960
Filing Date: 2004-07-27
Classification: C08F

Abstract:
A continuous anion polymerization method for preparing transparent high impact vinyl aromatic polymer comprising the steps of:i) charging and polymerizing vinyl aromatic monomers and initiator to obtain vinyl aromatic polymer in the presence of solvent and polar organic compounds in a first reactor; ii) continuously charging and polymerizing vinyl aromatic monomers and conjugated diene monomers to the vinyl aromatic polymer obtained in the first reactor to obtain tapered vinyl aromatic polymer chain in the presence of organic solvent in a second reactor; iii) continuously charging and polymerizing vinyl aromatic monomers and multi-functional compounds to the vinyl aromatic polymer chain obtained in the second reactor to obtain high impact vinyl aromatic polymer in the presence of organic solvent in a third reactor; and iv) terminating the reaction with terminator and removing the remaining hydrocarbon solvent and unreacted monomers to obtain transparent high impact vinyl aromatic polymer having number average molecular weight: 20,000 to 1,000,000 and molecular weight distribution: 1.1 to 20, wherein the molar ratio of charged compounds is 100 mole of vinyl aromatic monomer/1 to 100 mole of conjugated diene monomer/0.01 to 1 mole of initiator; the amount of organic solvent is 50 to 500 (w/v) % of total reactant; and the polymerization temperature is 30 to 160Â° C.