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The above amounts of diethanolamine and iodine were added to the above amount of soybean oil with stirring. The mixture was stirred for 23 hours at a temperature between about 210° F. and about 226° F. Then, the above amounts of maleic anhydride, diethylene glycol, and p-toluenesulfonic acid were added with stirring. The mixture was stirred under vacuum for 8 hours at a temperature between about 210° F. and about 230° F. to give a liquid soybean oil based polyol with a hydroxyl number of 55. A reaction mixture of about 10.00 grams of the polyol and the above indicated amount of diphenylmethane diisocyanate yielded a solid soybean oil based polyurethane material.

1. stirringThe mixture was stirred for 23 hours at a temperature between about 210° F. and about 226° F
2. stirringwith stirring
3. stirringThe mixture was stirred under vacuum for 8 hours at a temperature between about 210° F. and about 230° F.
4. customto give a liquid soybean oil