MULTIPLE-STEP PROCESS FOR THE PREPARATION OF3-ISOCYANATOMETHYL-3,5/5-TRIMETHYLCYCLOHEXYLISOCYANATE Abstract of the Disclosure This invention discloses a non-phosgene processfor the preparation of 3-isocyanatomethyl-3,5,5-trimethyl-cyclohexylisocyanate by the reaction of the precursordiamine with urea and an aliphatic alcohol in the presenceof a dialkyl carbonate and an alkyl carbonate. The inter-mediate diurethane is separated from starting materials andby-products and thermally cleaved to alcohol and diisocya-nate which are separated by fractional condensation of theproducts from the vapor state. This process gives highyields of the desired diisocyanate and lends itself particu-larly to continuous processing.

Title
Preparation en plusieurs etapes de 3-isocyanatomethyl-3,5,5- trimethylcyclohexylisocyanate
Multiple-step process for the preparation of 3- isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate
Application Number
452345
Publication Number
1225997
Application Date
April 18, 1984
Publication Date
August 25, 1987
Inventor
Towae Friedrich
Merger Franz
Hellbach Hans
Agent
ROBIC ROBIC & ASSOCIES ASSOCIATES
Assignee
Basf Aktiengesellschaft
IPC
C07C 119/045
C07C 265/14
C07C 263/04
C07C 69/00
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