Process for preparing polyether polyols
AssigneeBayer MaterialScience AG
InventorsKlaus Lorenz, Marcus Eichmann
Life of this patent
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Abstract
The present invention relates to a process for preparing polyether polyols by base-catalyzed addition of alkylene oxides (epoxides) onto starter compounds which are solid at room temperature and have Zerevitinov-active hydrogen atoms, a particular feature of which is that visually clear and/or homogeneous products are obtained even in the absence of solvents.
Claims16
Process for preparing polyether polyols having n En blocks each comprising at least 75% by weight of oxyethylene units, and m Am blocks being different from the En blocks, where n and m are each natural numbers from 1 to 10 and at least one starter compound having at least one Zerevitinov-active hydrogen atom and a melting point of ≧40° C., comprising reacting the at least one starter compound with ethylene oxide and at least one further alkylene oxide compound in the presence of a catalyst, wherein the En block(s) are metered in under the conditions of the following inequation;
- T
- n
- *
- x
-
- (
- cat
- )
- *
- t
- n
- x
- n
-
- (
- EO
- )
- >
- 2.9
-
-
- in
-
- [
- °C
- .
-
- *
-
- h
- ]
- (
- 1
- )
- where
- Tn is defined as the man reaction temperature in ° C. during the metered addition of the ethylene oxide for the En block,
- x(cat) is defined as the amount of catalyst used in mol,
- tn is defined as the metering time for the ethylene oxide in the En block in hours,
- xn (EO) is defined as the amount of ethylene oxide metered in for the En block in mol, and
- n is as defined above,
- and wherein the total content of oxyethylene units in the polyether polyols, based on the total mass of all the alkylene oxides metered in, is from 5 to 85% by weight.
Process according to claim wherein the alkylene oxides used are ethylene oxide and propylene oxide.
Dependencies are inferred from the claim text.