The urethane foam industry in japan as well as in european and american countries experienced a dramatic growth within the last decade.
Isocyanate is obtained form the the reaction of amine with trichloromethyl chloroformate by simple heating these two reagents in toluene. This offers a conventient new method for synthesizing isoanate from amine. A new method to prepare unsaturated polyurethanes from, 1,4 dicchloro-2- butene sodium cynate and glkycol is described.