No abstract

No abstract

A stannous octoate catalyzed phenyl isocyanate method for the determination of the hydroxyl equivalent weight of polyoxyalkylene compounds is described. The method is relatively free from side reactions because stannous octoate is a relatively selective catalyst for the alcoholisocyanate reaction. The method is applicable to most hydroxyl compounds including sterically hindered and tertiary alcohols. Aromatic hydroxyl compounds are an exception and cannot be determined. Reaction times in the range of 30 to 40 minutes at room temperature are usually required.Thus, the method is rapid and the precision is comparable with conventional acylation methods.N THE manufacture of flexible and

No abstract

No abstract