Multiple-step process for the preparation of 3-...

Details Multiple-step process for the preparation of 3-... Multiple-step process for the preparation of 3-...

C - Chemistry, Metallurgy

07

C

260/456.4

C07C 69/00 (2006.01) C07C 263/04 (2006.01) C07C 265/14 (2006.01)

Patent

CA 1225997

MULTIPLE-STEP PROCESS FOR THE PREPARATION OF 3-ISOCYANATOMETHYL-3,5/5-TRIMETHYLCYCLOHEXYLISOCYANATE Abstract of the Disclosure This invention discloses a non-phosgene process for the preparation of 3-isocyanatomethyl-3,5,5-trimethyl- cyclohexylisocyanate by the reaction of the precursor diamine with urea and an aliphatic alcohol in the presence of a dialkyl carbonate and an alkyl carbonate. The inter- mediate diurethane is separated from starting materials and by-products and thermally cleaved to alcohol and diisocya- nate which are separated by fractional condensation of the products from the vapor state. This process gives high yields of the desired diisocyanate and lends itself particu- larly to continuous processing.

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