Process for the preparation of polyester polyols

Details Process for the preparation of polyester polyols Process for the preparation of polyester polyols

C - Chemistry, Metallurgy

07

C

260/486.4, 260/4

C07C 69/34 (2006.01) C07C 69/80 (2006.01) C08G 63/12 (2006.01) C08G 63/16 (2006.01)

Patent

CA 1059529

ABSTRACT Polyester polyols are prepared by the reaction of a polycarboxylic acid or anhydride with a polyhydric alcohol employing in an initial step a stoichiometric excess of poly- carboxylic acid or anhydride, thereafter removing between 90% to 95% of the water of esterification, adjusting the stoichiometry of the reaction by addition of polyhydric alcohol, and continuing the esterification reaction until a polyester polyol having an acid number of less than two is obtained. The process allows for an increase in reactor capacity without equipment modification at the same cycle times and a decrease in side product formation.

261929

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