| 摘要 |
<p>The invention relates to a method for producing pure a-alkoxy- -hydroxy-polyalkylene glycols, creating small impurities of the product on high-molecular a-O-di-hydroxy-polyalkylene glycols. Said method is based on the use of high-boiling initiator alcohols of the following general structure R2 -(OCH2 CHR)K OH wherein R2 represents an alkyl radical comprising between 1 and 4 C atoms, preferably R2 = CH3, k represents a number between 1 and 10, preferably between 1 and 4, and R represents H, CH3 or an alkyl radical comprising between 2 and 4 C atoms, preferably R = H, CH3. The use of the cited initiator alcohols enables the mixture of a basic catalyst and an initiator alcohol to be dried in such a way that it has a very low water content, and thus to produce very low concentrations of unwanted a-O-di-hydroxy-polyalkylene glycol impurities.</p> |
