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Polyaddition reactions between polymethylene bis‐ N,N ‐ethyleneurethanes and polymethylene dimercaptans were investigated. The most successful polyaddition was carried out in dimethylformamide at 75°C. in the presence of triethylamine as catalyst; a fiber‐forming polyurethane sulfide having an intrinsic viscosity of 1.05 was obtained in about 90% yield. Arguments for the linear structure of the product are given.
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Iwakura et al. (1960) studied this question.
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