Double-metal cyanide catalysts for preparing polyether polyols
US6797665B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 2002 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Aug 22, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2531/845
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to double-metal cyanide catalysts for preparing polyols by the polyaddition of alkylene oxides on to starter compounds containing active hydrogen atoms, wherein the DMC catalysts are composed of: a) at least one double-metal cyanide compound; b) at least one organic complexing ligand; and, optionally, c) at least one functionalized polymer, wherein the organic complexing ligand is a mixture of a C3-C7 aliphatic alcohol and from about 2 to about 98 mole %, based on the total amount of organic complexing ligand, of a cyclic, aliphatic, cycloaliphatic or aromatic ketone. The DMC catalysts of the present invention have increased activity compared to known catalysts. Additionally, the DMC catalysts of the present invention can be used to prepare polyols with reduced high molecular weight components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.