| 摘要 |
<p>PROCESS FOR THE PREPARATION OF POLYOXYBUTYLENEPOLYOXYALKYLENE GLYCOL CARBOXYLIC ACID DIESTER The invention relates to a process for the preparation of polyoxybutylene-polyoxyalkylene glycol carboxylic acid diesters through the reaction of tetrahydrofuran with at least one 1,2-alkylene oxide and a carboxylic anhydride in the presence of bleaching earth having a water content of less than 3 percent by weight as the catalyst.</p> |
