Process for the preparation of polyester polyols

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

1975-09-29

1977-04-19

Phynes, Lucille M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 75M, 260468K, 260475P, C07C 6934, C07C 6952

Patent

active

040188159

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 polycarboxylic 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.

REFERENCES:
patent: 3803210 (1974-04-01), Rod et al.
patent: 3907863 (1975-09-01), Voss
patent: 3911048 (1975-10-01), Vargiu et al.

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