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US 5,672,761 AGranted
Method for reducing the viscosity of high viscosity polyether polyols
AssigneeBayer Aktiengesellschaft
InventorsRick L. Adkins, William E. Slack
Life of this patent
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Abstract
The viscosity of polyether polyols characterized by functionalities greater than or equal to 1, viscosities greater than 500 mPa.multidot.s at 25.degree. C. and at least 20% terminal secondary hydroxyl groups is reduced by converting at least one terminal hydroxyl group of the polyether to a leaving group and then reacting the conversion product with a primary amine or ammonia at a temperature of from about 70.degree. to 250.degree. C.
Claims4
A method for reducing the viscosity of a polyether polyol comprising
- a) converting at least one terminal hydroxyl group of a polyether polyol characterized by a viscosity greater than 500 mPa.multidot.s at 25.degree. C. and at least 20% terminal propylene oxide groups to a leaving group, and
- b) reacting the product of a) with a primary amine or ammonia at a temperature of from about 70.degree. to about 250.degree. C.
Dependencies are inferred from the claim text.