Process for the preparation of polyester or polyether-polyester

Details Process for the preparation of polyester or polyether-polyester Process for the preparation of polyester or polyether-polyester

1984-04-09

1986-04-15

Trousof, Natalie

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

Organic compounds

Carboxylic acid esters

560 83, 560 89, 560127, 560192, 560197, 560198, 560200, 560 93, C07C 6708, C07C 6726

Patent

active

045829268

ABSTRACT:
In order to prepare polyester or polyetherpolyester polyols, polyols, preferably di- to hexafunctional polyether polyols having hydroxyl numbers from 15 to 250 are esterified with at least one carboxylic acid anhydride, preferably phthalic acid anhydride, in the presence of N-methylimidazole, triethylenediamine, and/or triphenylphosphine as catalysts to form a carboxylic acid half-ester, and said half-ester is then oxyalkylated with at least one alkylene oxide, preferably ethylene oxide, in the presence of N-methylimidazole, triethylenediamine, triphenylphosphine, thiodialkylene glycol, employing a mixture of at least two of the compounds cited as catalysts.

REFERENCES:
patent: 3459733 (1969-08-01), Byrd et al.
patent: 3462395 (1969-08-01), Wiener
patent: 3585185 (1971-06-01), Levis et al.
patent: 4144395 (1979-03-01), Murphy et al.

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