Manufacture of block polyester polyols, and polyurethanes...

Details Manufacture of block polyester polyols, and polyurethanes... Manufacture of block polyester polyols, and polyurethanes...

C - Chemistry, Metallurgy

08

G

402/213

C08G 63/20 (2006.01) C08G 18/42 (2006.01) C08G 18/79 (2006.01)

Patent

CA 1323952

ABSTRACT OF THE DISCLOSURE A method for the manufacture of polyester polyols is disclosed. The method comprises feeding to a reactor at least one aliphatic carboxylic acid or ester thereof, at least one secondary dihydric alcohol and at least one primary trihydric alcohol, heating the resultant admixture and removing water. When at least 95% of the water has been removed, additional primary trihydric alcohol is added and heating is continued. The reactants are selected so that the range of molecular weights thereof is not more than 100. A block polyester polyol is obtained. Polyurethanes obtained from the polyester polyol tend to have more uniform and superior properties. The polyurethanes may be used in variety of end uses.

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