Method for manufacturing (meth)acrylic resin composition

摘要

A method for producing a (meth)acrylic resin composition, the method comprises the steps of continuously feeding methyl methacrylate and the other materials into a tank reactor while controlling each of the amounts thereof, performing bulk polymerization in the tank reactor to obtain a reaction product, recovering a mixture (A) containing methyl methacrylate and the others from the reaction product, and continuously feeding the mixture (A) into the tank reactor, wherein each of the amounts of methyl methacrylate and the others being fed into the tank reactor are controlled on the basis of the amount of the mixture (A) being fed into the tank reactor and the proportions of methyl methacrylate and the others in the mixture (A), and the perfect-mixing time of the tank reactor, the half life of a radical polymerization initiator at a temperature equal to the temperature inside the tank reactor, the agitation power of the tank reactor, the mean residence time of a reaction starting material in the tank reactor, and the concentration of the radical polymerization initiator in the reaction starting material satisfy a particular relationship.

主权项

1. A method for producing a (meth)acrylic resin composition, the method comprising:
continuously feeding methyl methacrylate (1), a chain transfer agent (3), and a radical polymerization initiator (4) into a tank reactor while controlling each amount of the methyl methacrylate (1), the chain transfer agent (3), and the radical polymerization initiator (4), performing bulk polymerization in the tank reactor at a polymerization conversion of 40 to 70% by mass to obtain a reaction product, recovering a mixture (A) comprising methyl methacrylate (1′) and a chain transfer agent (3′) from the reaction product, and continuously feeding the mixture (A) into the tank reactor, wherein each of the amounts of the methyl methacrylate (1) and the chain transfer agent (3) being fed into the tank reactor is controlled on the basis of information comprising an amount of the mixture (A) being fed into the tank reactor and proportions of the methyl methacrylate (1′) and the chain transfer agent (3′) in the mixture (A), and a perfect-mixing time of the tank reactor (θM [hr]), a half life of the radical polymerization initiator at a temperature equal to a temperature inside the tank reactor (τ1/2 [hr]), an agitation power of the tank reactor (PV [kW/m3]), a mean residence time of a reaction starting material in the tank reactor (θ [hr]), and a concentration of the radical polymerization initiator in the reaction starting material (I [ppm]) satisfy:
θM>τ1/2, andPV×θ×I×τ1/2<4.