Double metal cyanide catalysts for producing polyether polyols
AssigneeBayer Aktiengesellschaft
InventorsJörg Hofmann, Pieter Ooms, Pramod Gupta, Walter Schäfer, John Lohrenz
Life of this patent
Estimating the term…
Abstract
This invention relates to novel double metal cyanide (DMC) catalysts for the production of polyether polyols by polyaddition of alkylene oxides onto starter compounds having active hydrogen atoms, wherein the catalyst contains a) double metal cyanide compounds, b) organic complex ligands other than c) and c) ionic surface- or interface-active compounds. The catalysts according to the invention have greatly increased activity in the production of polyether polyols.
Claims19
A double-metal cyanide catalyst comprising:
- a). at least one double-metal cyanide compound;
- b). at least one organic complex ligand which is not an ionic-surface or interface-active compound;
- and
- c). at least one monomeric ionic-surface or interface-active compound.
A process for the preparation of a double-metal cyanide catalyst comprising the steps of:
- (a) reacting, in aqueous solution, (i) at least one metal salt, (ii) with at least one metal cyanide salt, in the presence of (iii) an organic complex ligand, which is not an ionic-surface or interface-active compound, to form a suspension;
- and (b) treating the suspension with at least one monomeric ionic-surface or interface-active compound.
A double-metal cyanide catalyst comprising:
- a). at least one double-metal cyanide compound;
- b). at least one organic complex ligand which is not an amphiphillic ionic-surface or interface-active compound;
- and
- c). at least one amphiphillic ionic-surface or interface-active compound.
Dependencies are inferred from the claim text.