Multi-metal cyanide complexes as catalysts and their use in...

Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing

Reexamination Certificate

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C568S618000, C568S620000, C568S623000, C568S624000, C568S625000, C502S152000, C502S159000, C502S162000, C502S167000, C502S175000

Reexamination Certificate

active

06303833

ABSTRACT:

The invention relates to crystalline multimetal cyanide complexes, mixtures thereof, processes for their preparation, their use as catalysts and a process for preparing polyetherpolyols using this catalyst.
Tailor-made polyetherpolyols are required for preparing polyurethane foams with a wide range of properties. For example, high molecular weight polyols are used for soft foams and shorter-chain polyols are used for hard foams.
Polyetherpolyols are, as a rule, prepared from alkylene oxides in the presence of a starter using various catalysts such as bases, hydrophobic bilayer hydroxides, acidic or Lewis-acidic systems, organometallic compounds or multimetal cyanide complex compounds.
There is increasing commercial interest in long-chain polyetherpolyols which have a low content of unsaturated components. Multimetal cyanide complex compounds have proven particularly suitable as catalysts for preparing such polyetherpolyols with low contents of unsaturated components.
Multimetal cyanide complex catalysts are known per se. These are, as a rule, compounds which are difficult to characterize by X-ray analysis, are of low crystallinity and, in some cases, are X-ray amorphous, or crystalline two-metal cyanides having a cubic structure.
EP-A-0 654 302 describes improved two-metal cyanide complex catalysts. Particular mention is made of zinc hexacyanocobaltate catalysts which are employed for polymerizing epoxides.
EP-A-0 743 093 describes highly active two-metal cyanide complex catalysts. The described catalysts are essentially amorphous and are based on zinc hexacyancobaltate. They are employed for polymerizing epoxides.
EP-A-0 755 716 describes highly active two-metal cyanide complex catalysts. They are essentially crystalline and are based on zinc hexacyanocobaltate complexes.
Two-metal cyanide catalysts are regarded as suitable for polymerizing epoxides either when they are amorphous, in which case they contain more than 0.2 mol of metal salt per mole of two-metal cyanide, or when they are crystalline, in which case they contain less than 0.2 mol of metal salt per mole of two-metal cyanide.
It is an object of the present invention to provide multimetal cyanide complexes which are substantially or completely crystalline and show high catalytic activity.


REFERENCES:
patent: 5158922 (1992-10-01), Hinney et al.
patent: 5498583 (1996-03-01), Le-Khac
patent: A-2228651 (1998-09-01), None
patent: A-0 654 302 (1995-05-01), None
patent: A-0 743 093 (1996-11-01), None
patent: A-0 755 716A1 (1997-01-01), None
patent: A-0 862 947A1 (1998-09-01), None

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