Process for alkoxylation with DMC catalysts in a loop...

Details Process for alkoxylation with DMC catalysts in a loop... Process for alkoxylation with DMC catalysts in a loop...

2008-11-25

2011-11-15

Gulakowski, Randy (Department: 1766)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From organic oxygen-containing reactant

C564S505000, C568S623000, C568S624000, C568S620000, C568S679000

Reexamination Certificate

active

08058388

ABSTRACT:
The invention relates to a process for preparing polyethers of the formula (I)in-line-formulae description="In-line Formulae" end="lead"?R1—(CHR2CHR3—O)n—H  (I)in-line-formulae description="In-line Formulae" end="tail"?wheren=1 to 12 000,R1=a radical comprising at least one carbon atom andR2and R3are each independently H or a hydrocarbon radical, where the units designated with the index n may be the same or different (the R2and R3radicals in the different units n may thus be the same or different),by alkoxylating a starter compound which comprises the R1radical in the presence of a double metal cyanide catalyst (DMC catalyst) in a loop reactor, which is characterized in that the alkoxylation is performed in a loop reactor which has an ejector mixing nozzle, in which all substances involved in the reaction or assistants can be added to the circulated reaction mixture, an alkylene oxide or a plurality of different alkylene oxides being metered into the reaction mixture via the ejector mixing nozzle at the same time (random addition) or at different times (block addition).

REFERENCES:
patent: 5159092 (1992-10-01), Leuteritz
patent: 6673972 (2004-01-01), Ostrowski et al.
patent: 6838061 (2005-01-01), Berg et al.
patent: 198 54 637 (2000-05-01), None
patent: 0 419 419 (1991-03-01), None
patent: WO 01/62826 (2001-08-01), None
Derwent 2001-638918, Bauer et al., Aug. 2001.

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