Preparing polyester polyols
AssigneeBASF SE
InventorsLionel Gehringer, Joern Duwenhorst, Fin Lammers, Axel Wilms
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Abstract
A process for preparing a polyester polyol comprises the steps of: (a) preparing a reaction mixture comprising the following components: A: at least one carboxylic acid recovered from natural raw materials and having at least two acid groups, B: at least one polyhydric alcohol, C: at least one organic phosphite compound, D: at least one Lewis acid; (b) heating the reaction mixture to a temperature of at least 160° C. and removing the water formed in the course of the reaction; (c) heating the reaction mixture to a temperature of at least 210° C. under a pressure below 1013 mbar for a period of time in the range from 0.1 to 25 hours.
Claims22
A process for preparing a polyester polyol, the process comprising of:
- (a) preparing a reaction mixture comprising:
- A:
- at least one carboxylic acid recovered from a natural raw material and having at least two acid groups, selected from the group consisting of sebacic acid, azelaic acid, dodecanedioic acid and succinic acid,
- B:
- at least one polyhydric alcohol,
- C:
- at least one organic phosphite compound,
- D:
- at least one Lewis acid;
- (b) heating the reaction mixture to a temperature of at least 160° C. and removing water formed during a reaction;
- and
- (c) heating the reaction mixture to a temperature of at least 210° C. at a pressure below 1013 mbar for 0.1 to 25 hours,
- to obtain a polyester polyol.
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Dependencies are inferred from the claim text.