Manufacture of block polyester polyols, and polyurethanes derive

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof

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528300, 528307, 521157, C08G 6302

Patent

active

049755234

ABSTRACT:
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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patent: 4400477 (1983-08-01), Blanpied
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patent: 4608413 (1986-08-01), Nachtkamp
patent: 4716213 (1987-12-01), Altounian et al.
patent: 4789719 (1988-12-01), Altounian

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