公开(公告)号：DE3227748A1

公开(公告)日：1984-01-26

申请号：DE3227748

申请日：1982-07-24

Applicant: BASF AG

Inventor： MERGER FRANZ DR ,  NESTLER GERHARD DR ,  TOWAE FRIEDRICH DR ,  HELLBACH HANS

IPC: C07C265/14 ,  C07C67/00 ,  C07C241/00 ,  C07C263/04 ,  C07C265/04 ,  C07C119/042 ,  C07C118/00

Abstract: To prepare hexamethylene diisocyanate, hexamethylene dialkyl urethanes are evaporated at temperatures from 220 to 300 DEG C, advantageously under reduced pressure, without decomposition, the vapours are subsequently cleaved thermally in the gas phase at temperatures above 300 DEG C and under a pressure of 0.1 to 100 mbar, and the cleavage products are subjected to fractional condensation, the first condensation step giving mostly hexamethylene diisocyanate and the second condensation step giving the alcohol.

公开(公告)号：DE3160799D1

公开(公告)日：1983-09-29

申请号：DE3160799

申请日：1981-10-24

Applicant: BASF AG

Inventor： MERGER FRANZ DR ,  HUTMACHER HANS-MARTIN DR ,  TOWAE FRIEDRICH DR

IPC: C07C265/06 ,  C07C67/00 ,  C07C241/00 ,  C07C263/04 ,  C07C269/06 ,  C07C119/042 ,  C07C118/00

Abstract: 1-Alkenyl isocyanates are prepared by reacting aldehydes with carbamates to give N-(1-alkenyl)-carbamates and splitting these compounds at elevated temperatures. The 1,2-unsaturated isocyanates obtained are valuable starting materials for the preparation of pest control agents, dyes, drugs, textile water repellents, detergents, plastics, bleaches and adhesives, since they possess an activated double bond or an activated alpha -carbon atom, in addition to a reactive isocyanate group.

公开(公告)号：DE3063431D1

公开(公告)日：1983-07-07

申请号：DE3063431

申请日：1980-04-23

Applicant: BASF AG

Inventor： MERGER FRANZ DR ,  TOWAE FRIEDRICH DR ,  HARDER WOLFGANG DR

IPC: C07C271/06 ,  C07C125/06

Abstract: A process for the preparation of an aryl mono-, di-, and/or polyurethane comprising the steps of A. reacting a primary aromatic mono-, di-, and/or polyamine with an O-alkyl carbamate in the presence of an alcohol at temperatures greater than 160 DEG C., and B. separating the ammonia and other by-products from the aryl mono-, di-, and/or polyurethane. The reaction is preferably carried out in the presence of urea. The aryl mono-, di-, and/or polyurethanes produced are valuable end and intermediate products. They can be transferred into the corresponding isocyanates which can then be used for the preparation of polyurethanes.