The invention provides a method for preventing deposition of polymer scale on the reactor walls in the polymerization of an ethylenically unsaturated monomer, in particular, by emulsion polymerization. The method comprises coating the reactor walls with a coating composition containing, as the essential components, (A) an organic compound having at least 5 conjugated π bonds in a molecule, (B) a chelating agent and (C) a metal compound capable of producing metal ions having a coordination number of at leas 2 which presumably forms a metallic chelate compound with the chelating agent contributing to the formation of a strongly adsorbed layer on the reactor walls. The coating composition may be further admixed with a silicic acid compound such as a colloidal silica.
本发明提供了一种在
乙烯基不饱和单体聚合,特别是乳液聚合过程中防止聚合物垢沉积在反应器壁上的方法。该方法包括在反应器壁上涂上涂层组合物,涂层组合物的主要成分包括:(A) 分子中至少有 5 个共轭 π 键的有机化合物;(B)
螯合剂;(C) 能够产生配位数至少为 2 的
金属离子的
金属化合物,该
金属离子可与
螯合剂形成
金属螯合物,从而在反应器壁上形成强吸附层。涂层组合物还可进一步掺入
硅酸化合物,如胶体
二氧化硅。