METHOD FOR PRODUCING ALKYLPOLYALKYLENE GLYCOL CARBOXYLATE

摘要

PROBLEM TO BE SOLVED: To provide a catalyst which is suitable for the reaction of a carboxylic ester with an alkylene oxide and enables to produce a desired alkylpolyalkylene glycol carboxylate under a mild reaction condition without any undesirable byproduct formed. SOLUTION: The alkylpolyalkylene glycol carboxylate can be produced by a method comprising a process for reacting a carboxylic ester with an alkylene oxide in the presence of a multimetal cyanide compound as a catalyst represented by formula (I): M<3> 2 M<1> a [M<2> (CN)b (A)c ]d fM<1> g Xn mM<3> p Yq h(H2 O)eLkP, for example, by formula (II): M<a> Fe[Fe(CN)6 ]nH2 O [wherein M<a> is a potassium ion (K<+> ) or an ammonium ion (NH4 <+> )]; and can be used as a raw material for a concrete fluidizing polymer.