Carefully selected fatty acids allow esters to be composed which, additionally, have excellent polymerization stabdity (Table 9). Polymerization and in the final resort, carbonization are undesirable reactions occurring when unsaturated oils are exposed to air and heat. Viscosity increases until finally rubber-like films are built up which tend to stick very tightly to solid surfaces and which cannot be removed by any solvent. Polymerization-stable substances are of outstanding importance in the composition of high-quality release agents and bread cutting oils or emulsions. K u r . o $ r and Dr. WMori& for advice and aid in physico-chemical measurements and Dagmar Gobels, Ulrich Haas and Damian Slaps for technical assistance.Etheralcohols (polyols), which are ofinterest inanumberoffieldsofapplication such as, e. g.,PU foams,PU dispersions and PU casting resins,are readily accessible by the acid-catalyzed conversion ofepoxidized fatty materials with mono-and polyvalent alcohols. By means of epoxidized triglycerides and epoxidized oleyl alcohol it is exemplified how polyols with a wideley variable hydroxyl value can be built up by variation ofthe reaction course or the alcohol component. Two selected fields of application are illustrated in more detail.
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