Abstract
AbstractA convenient three‐stage reaction has been devel‐oped for the preparation of polyols from epoxidized tallow (ET), trimethylolpropane (TMP), and propyl‐ene oxide (PO), without the previously required water washing step. ET is first heated with excess TMP under catalysis by BF3, causing rapid ring open‐ing of the oxirane function. In the second stage, KOH catalyzes ester interchange of TMP with the triglyc‐eride. Finally, PO is caused to react with free TMP and with other available hydroxylic components, to produce a homogeneous mixture of polyols. The polyols, all liquid at room temperature, were adjusted to equivalent weights of 100 and 120 with added triisopropanolamine and reacted with a polymeric isocyanate in the presence of a blowing agent to give low‐density rigid foams. Densities ranged from 1.6 to 1.8 lb/ft3 and compressive strengths from 21 to 30psi.
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