Patent ID: 8981019
Filing Date: 2015-03-17
Classification: C08F,Y10S

Abstract:
1. A method for producing a methacrylic-based polymer, comprising the following Steps (1) and (2): Step (1): using a complete mixing reactor (A) to thereby obtain a first syrup with the step comprising the following steps (1)-1, (1)-2 and (1)-3: wherein in the formula (1), α is a number of moles of the first radical polymerization initiator (a) based on 1 mol of the monomer mixture; and β is a proportion (mass %) of an alkyl acrylate unit in the methacrylic-based polymer to be produced; Step (2): using a reaction apparatus (D) comprising a plug flow mixer (B) and a plug flow reactor (C) to thereby obtain a second syrup, wherein a second radical polymerization initiator (c) is added to the first syrup with the plug flow mixer (B) having an inner wall temperature set at the temperature of the complete mixing reactor (A) interior or higher and 230° C. or lower to thereby make a syrup mixture, and then polymerization is carried out by the plug flow reactor (C) to obtain the second syrup.