METHOD FOR PREPARING THERMOPLASTIC NITRILE COPOLYMER

摘要

PURPOSE: A method for preparing a thermoplastic nitrile copolymer of an unsaturated nitrile compound and an aromatic vinyl compound is provided which reduces the content of the unsaturated nitrile compound and minimizes the content of the remaining monomer. CONSTITUTION: A nitrile copolymer comprising 10-20 wt.% of an unsaturated nitrile compound monomer and 80-90 wt.% of an aromatic vinyl compound monomer are prepared by using an underwater suspension polymerization method, wherein 0.1-0.8 wt.% of a polymerization initiator having a half life of 10 hours at 90-110 deg.C, 0.10-0.30 wt.% of a tert-dodecylmercaptan molecular weight controlling agent and 0.3-0.8 wt.% of a calcium phosphate tribasic suspension dispersion stabilizing agent are used based on 100 wt.% of the total monomer to reduce the amount of the remaining monomer to less than 1 wt.%.