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US 2014/0275632 A1Published application
Catalyst for the production of polyols having lower amounts of high molecular weight tails
AssigneeBayer MaterialScience AG
InventorsKenneth G. McDaniel, George G. Combs
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Abstract
This invention relates to novel double metal cyanide catalysts and to a process for the production of these double metal cyanide catalysts. These DMC catalysts can be used to prepare polyoxyalkylene polyols which have low amounts of high molecular weight tail compared polyoxyalkylene polyols prepared from DMC catalysts of the prior art.
Claims13
A double-metal cyanide catalyst comprising:
- (a) at least one metal salt,
- (b) at least one metal cyanide salt,
- (c) at least one alkali metal salt of an oxyacid with a pKa equal to or less than 3.5,
- (d) at least one organic complexing ligand,
- and
- (e) optionally, one or more functionalized polymers;
- wherein alkali metal is present in the catalyst in an amount of from 0.4 to 10 wt. %, based on the total weight of the catalyst.
4 more elements
A process for preparing a double-metal cyanide catalyst comprising
- (1) reacting
- (a) at least one metal salt,
- (b) at least one metal cyanide salt,
- and
- (c) at least one alkali metal salt of an oxyacid with a pKa equal to or less than 3.5,
- in the presence of
- (d) at least one organic complexing ligand,
- and
- (e) optionally, one or more functionalized polymer;
- under conditions sufficient to form a catalyst, wherein alkali metal is present in the catalyst in an amount of from 0.4 to 10 wt. %, based on the total weight of the catalyst.
7 more elements
Dependencies are inferred from the claim text.