Covestro Deutschland Ag

Covestro LLC

Yue Yang

Jack R Reese

Jose F Pazos

Edward P Browne

This invention relates to process for preparing low viscosity polyoxyalkylene polyols (P) that have a narrow molecular weight distribution. This process comprises reacting a H-functional starter substance (S), a H-functional starter substance (S) and a H-functional starter substance (S) with one or more alkylene oxides in the presence of a double metal cyanide catalyst. The resultant polyoxyalkylene polyols (P) have a functionality of 2 to 8 and a hydroxyl number of greater than 35 to 115 mg KOH/g polyol.

Product-to-product process for preparation of low viscosity polyoxyalkylene polyols

This invention relates to a semi-batch process for preparing low viscosity polyoxyalkylene polyether polyols (P) that have a narrow molecular weight distribution. This process comprises reacting a H-functional starter substance (S), a H-functional starter substance (S) and a H-functional starter substance (S) with one or more alkylene oxides in the presence of a double metal cyanide (DMC) catalyst. The resultant polyoxyalkylene polyols (P) have a functionality of 2 to 8 and a hydroxyl number of 5 to 35 mg KOH/g polyol. In addition, the polyoxyalkylation can be completed with a low continuous addition of starter (CAOS) cap.

Product-to-product process for preparation of low viscosity polyoxyalkylene polyether polyols

This invention relates to a process for preparing low viscosity polyoxyalkylene polyols (P) that have a narrow molecular weight distribution. This process comprises reacting a H-functional starter substance (S), a H-functional starter substance (S) and a H-functional starter substance (S) with one or more alkylene oxides in the presence of a double metal cyanide catalyst. The resultant polyoxyalkylene polyols (P) have a functionality of 2 to 8 and a hydroxyl number of 5 to 35 mg KOH/g polyol.

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Canton, MI, United States of America

Yue Yang