Polymerization method and polymerization apparatus

摘要

In a polymerization apparatus in which the power of a motor is transmitted to a stirrer via oil-lubricated transmission box and speed reduction gear, the temperature of the lubricating oil in the transmission box and speed reduction gear is maintained constant by means of a heat exchanger, the torque between the motor and the transmission box or the speed reduction gear is measured with a torque meter, the viscosity of a reaction mixture is calculated from the measured torque and the number of rotation of the stirrer, and the stirrer is kept revolving until the calculated viscosity of the reaction mixture reaches a prescribed value.