| 摘要 |
A polymerization apparatus equipped with a circuit made up of a polymerization vessel, a heat exchanger placed outside said polymerization vessel, and a circulation pipeline extending from said polymerization vessel and returning to said polymerization vessel through said heat exchanger, a branch pipeline being connected to said circulation pipeline through a ball valve comprising a spherical valve element and a valve body for housing said spherical valve element, wherein the valve body of said ball valve is joined directly to said circulation pipeline, and a method of producing a polymer of a monomer having an ethylenically unsaturated double bond by using said apparatus. Scale and polymers in the form of blocks can be prevented from mixing with the reaction mixture. Therefore, where the obtained polymer is formed into a sheet or the like, the fish eyes can be decreased, and if the polymerization is repeated, clogging of the tubes of the heat exchanger and drop in the flow velocity of the reaction mixture can be prevented.
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