Patent ID: 9029495
Filing Date: 2015-05-12
Classification: C07C,C08G

Abstract:
1. A process for producing polyether polyols having primary hydroxyl end groups, comprising the following steps: 1. reacting a starter compound comprising active hydrogen atoms with an epoxide of the general formula (1): 2. reacting the product obtained in step 1 with a cyclic carboxylic anhydride; and 3. reacting the product obtained in step 2 with ethylene oxide in the presence of a catalyst selected from the group consisting of: (A) amines of the general formula (2): wherein: R2 and R3 represent independently of each other hydrogen, alkyl or aryl; or R2 and R3 together with the N-atom bearing them form an aliphatic, unsaturated or aromatic heterocycle; n represents a whole number from 1 to 10; R4 represents hydrogen, alkyl or aryl; or R4 represents —(CH (B) amines of the general formula (3): m and o represent independently of each other a whole number from 1 to 10.