A process for producing polycarbonate comprising: a) contacting a dialkyl carbonate with a dihydroxy compound in an oligomerization zone in the presence of an oligomerization catalyst under oligomerization conditions to form a first intermediate; and b) contacting the first intermediate with a diaryl carbonate in a polymerization zone in the presence of a polymerization catalyst under polymerization conditions to produce the polycarbonate wherein the molar ratio of dihydroxy compound to dialkyl carbonate in the oligomerization zone is at least 2:1.
一种生产聚
碳酸酯的工艺,包括:a) 在低聚物条件下,在低聚物催化剂存在下,将
碳酸二烷基酯与低聚物区中的二羟基化合物接触,形成第一中间体;b) 在聚合条件下,在聚合催化剂存在下,将第一中间体与聚合区中的
碳酸二芳基酯接触,生产聚
碳酸酯,其中低聚物区中二羟基化合物与
碳酸二烷基酯的摩尔比至少为 2:1。