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    • 5. 发明申请
    • BIPHASIC POLYMERIZATION PROCESS
    • 双向聚合工艺
    • WO99000442A1
    • 1999-01-07
    • PCT/US1998/013657
    • 1998-06-29
    • C08G63/685C08G63/79C08G63/87C08G64/12C08G64/24C08G75/18
    • C08G64/24C08G63/6856C08G63/79C08G63/87C08G64/12
    • Improvements are disclosed for biphasic polymerization processes in which an aqueous solution of a first monomer that is hydrolytically unstable below a pH of about six or above a pH of about eight is admixed with a water-immiscible organic solvent and there is added to the admixture a catalyst selected from tertiary amine, quaternary amine and phosphonium catalysts, an acid-forming co-monomer for the first monomer, an acid scavenger, after which the resulting polymer is recovered, wherein the improvement includes providing the aqueous solution at a pH between about six and about eight, and adding to the admixture the acid-forming co-monomer and the acid scavenger at relative rates effective to maintain the pH of the admixture between about six and about eight. The catalyst may be added in a molar ratio to the first monomer effective to provide a predetermined weight-average or number-average molecular weight for the resulting polymer. Biphasic polymerization processes for monomers that are not pH sensitive are also disclosed.
    • 对于双相聚合方法公开了改进,其中将水解稳定性低于约6或大于约pH 8的水解不稳定的第一单体的水溶液与水不混溶的有机溶剂混合并加入到混合物a 选自叔胺,季胺和鏻催化剂的催化剂,用于第一单体的酸形成共聚单体,酸清除剂,之后回收所得聚合物,其中改进包括提供水溶液的pH为约六 和约8,并且以相对速率加入酸形成共聚单体和酸清除剂,以有效地将混合物的pH保持在约6至约8之间。 催化剂可以与第一单体的摩尔比加入,有效地为所得聚合物提供预定的重均分子量或数均分子量。 还公开了对不敏感的单体的双相聚合方法。