| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a (meth)acrylic polymer in which unreacted (meth)acrylic monomer can be recovered/reutilized in a state in which self-polymerization is not carried out. SOLUTION: The method for producing the (meth)acrylic polymer comprises steps for continuously feeding a raw material composition containing a (meth)acrylic monomer containing≥50 mass% methyl methacrylate, a radical polymerization initiator and a chain-transfer agent to a polymerization vessel, continuously extracting a reaction mixture containing a (meth)acrylic polymer obtained by polymerizing at least a part of the (meth)acrylic monomer from the polymerization vessel, carrying out devolatilization treatment for separating and removing a volatile component containing a methyl methacrylate dimer and unreacted (meth)acrylic monomer, introducing the separated and removed volatile component into a distilling column and recovering a recovery component containing the methyl methacrylate dimer and the unreacted (meth)acrylic monomer so that the content of the methyl methacrylate dimer becomes 0.1-1.0 mass%. COPYRIGHT: (C)2005,JPO&NCIPI
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