Polymerization apparatus.

摘要

A polymerization apparatus which comprises a polymerization vessel and a circulating passage for circulation of a reaction mixture comprising a heat exchanger installed outside the polymerization vessel and a circulating pipe extending from the polymerization vessel and returning to the polymerization vessel through the heat exchanger, wherein at least a part of the inner surfaces of the circulating passage with which the reaction mixture comes into contact is covered with a film of gold or a gold-based alloy. Polymer scale is prevented from being deposited in the circulating passage. When the polymer obtained is formed into a product such as a sheet, a very small amount of fish eyes are poduced. Therefore, polymers of high quality can be produced efficiently at a high productivity. <IMAGE>