Process for preparing reactive polyether polyols having an...

Details Process for preparing reactive polyether polyols having an... Process for preparing reactive polyether polyols having an...

2007-03-06

2007-03-06

Keys, Rosalynd (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S620000, C568S621000

Reexamination Certificate

active

10828967

ABSTRACT:
Process for preparing polyether polyols having an end block of ethylene oxide by addition of alkylene oxides onto H-functional starter substances, in whichA) a polyether polyol precursor is prepared by means of double metal cyanide (DMC) catalysis in a semicontinuous mode of operation in which previously prepared polyether polyol together with the DMC catalyst are placed in a reactor and H-functional starter substance and propylene oxide are added continuously,B) the polyether polyol precursor from stage A) is reacted with propylene oxide or an ethylene oxide/propylene oxide mixture in the presence of the DMC catalyst in a continuously operating reactor to give a polyether polyol intermediate,C) the intermediate from stage B) is mixed with an alkali metal hydroxide as catalyst andD) reacted with ethylene oxide in a continuously operating reactor to give the final product,E) the catalyst is separated off from the final product obtained in stage D).

REFERENCES:
patent: 4355188 (1982-10-01), Herold et al.
patent: 5689012 (1997-11-01), Pazos et al.
patent: 7005552 (2006-02-01), Kaushiva
patent: 0 750 001 (2001-02-01), None
patent: WO 97/29146 (1997-08-01), None

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