Process for the preparation of polyester polyols

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

1987-04-10

1989-07-04

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560 84, 560 90, 560193, 560198, 524296, C07C 6708, C07C 6980

Patent

active

048452661

ABSTRACT:
A process for the preparation of polyester polyols having an acid number of less than 1, a hydroxyl number of approximately 20 to about 400, and having a functionality of efficaciously 2 to 3, wherein polycarboxylic acids and/or their anhydrides and multivalent alcohols are polycondensed, preferably in the absence of common esterification catalysts, at temperatures of from about 150.degree. to 250.degree. C., optionally under reduced pressure, up to an acid number of from 20 to 5. The resulting polycondensate is then oxyalkylated per carboxyl group using from 1 to 5 moles of an alkylene oxide, for example 1,2-propylene oxide and/or preferably ethylene oxide, in the presence of at least one tertiary amine catalyst from the group consisting of N-methylimidazole, diazabicyclo[2,2,2]octane, diazabicyclo[5,4,0]undec-7-ene and pentamethyldiethylenetriamine and mixtures thereof, in a quantity of from about 0.001 to 1.0 weight percent based on the weight of the polycondensate, at temperatures from about 100.degree. to 170.degree. C. and under a pressure of about 1 to 10 bar.

REFERENCES:
patent: 2863855 (1958-12-01), Wilson et al.
patent: 3459733 (1969-08-01), Byrd et al.
patent: 3462395 (1969-08-01), Wiener
patent: 4582926 (1986-04-01), Straehle et al.

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