Aminimides XIII long chain aminimides and isocyanates

Aminimides were prepared from esters of stearic, oleic, linoleic, phenylstearic, 9,10-dihydroxystearic, ricinoleic and dimer acids. Thermolysis of the aminimides to isocyanates was carried out in a wiped film molecular still and by vacuum distillation of a bulk sample. The latter process is suitable only for small samples of the simple aminimides. Acyl N,N-dimethylhydrazides, which are aminimide precursors, can generally be prepared by dehydration of carboxylic acid-unsym-dimethylhydrazine mixtures. Details of the preparation of dimer acid diisocyanate by this route are presented. Some information on the use of long chain aminimides as emulsifiers for halocarbon mixtures, e.g., bromoform-water, is presented.