METHOD FOR PREPARING THERMOPLASTIC NITRILE-BASED COPOLYMER

摘要

PURPOSE: A method for preparing a thermoplastic nitrile-based copolymer which maintains excellent mechanical and thermal properties as well as can minimize the content of residual monomers that is increased according to low content of unsaturated nitrile compound is provided. CONSTITUTION: A method for preparing a thermoplastic nitrile-based copolymer according to the present invention comprises suspending copolymer of unsaturated nitrile compound with aromatic vinyl compound in water wherein the method is characterized in that a mixed initiator containing two or more initiators in which one has 10 hours half-life less than 80 degees celsius and the other has 10 hours half-life more than 90 degees celsius is used as a polymerization initiator in the amount of 0.01 to 0.8 parts by weight based on 100 parts by weight of the total monomers.