Patents Assigned to Bsyer Aktiengesellschaft
  • Bimetallic-cyanide catalysts used for preparing polyether polyols
    Patent number: 6878661
    Abstract: The invention relates to novel double metal cyanide (DMC) catalysts for the preparation of polyether polyols by polyaddition of alkylene oxides to starter compounds containing active hydrogen atoms, wherein the catalyst contains a) double metal cyanide compounds, b) organic complex ligands other than c), and c) complex ligands formed by introduction of a glycidyl ether into the catalyst. The catalysts according to the invention have greatly increased activity in the preparation of polyether polyols.
    Type: Grant
    Filed: July 20, 1999
    Date of Patent: April 12, 2005
    Assignee: Bsyer Aktiengesellschaft
    Inventors: Pieter Ooms, Jörg Hofmann, Pramod Gupta, Walter Schäfer