Undesirable deposition of polyoxymethylene onto the inner wall of a polymerization vessel and onto a stirrer, which deposition is observed in the slurry polymerization of formaldehyde carried out in an inert organic liquid medium in the presence of a polymerization catalyst, can be minimized by carrying out the slurry polymerization in the presence of at least one polyvalent metal salt selected from polyvalent metal salts of alkylsalicylic acids and polyvalent metal salts of dialkyl esters of sulfosuccinic acid. Optionally, a polyethylene glycol monoether may be used in addition to the polyvalent metal salt.
在惰性有机液体介质中,在聚合催化剂存在下进行
甲醛淤浆聚合时,会观察到
聚甲醛在聚合容器内壁和搅拌器上有不理想的沉积,通过在至少一种多价
金属盐(选自烷基
水杨酸多价
金属盐和磺基
丁二酸二烷基酯多价
金属盐)存在下进行淤浆聚合,可将
聚甲醛在聚合容器内壁和搅拌器上的不理想沉积降至最低。 除多价
金属盐外,还可选择使用聚
乙二醇单醚。