Title:
MANUFACTURE OF POLYISOCYANATE
Document Type and Number:
Japanese Patent JPS5824553
Kind Code:
A
Abstract:
Polyisocyanates are prepared by reacting a polyamine solution with a phosgene solution. Excess phosgene and hydrogen chloride formed during the reaction are removed from the reaction mixture. The solvent is subsequently removed from the reaction mixture (e.g., by evaporation and condensation) and treated with a compound containing isocyanate reactive hydrogen atoms to convert any isocyanates present into urethanes and/or ureas. The thus-treated solvent may then be reused, preferably after any urethanes and/or ureas present in the solvent have been removed.
Inventors:
GERUHARUTO BUEEGENAA
HARUTOMUUTO KUNEEFUERU
GIYUNTAA ERENTO
MARUSERU PETEINAUKUSU
HARUTOMUUTO KUNEEFUERU
GIYUNTAA ERENTO
MARUSERU PETEINAUKUSU
Application Number:
JP12685082A
Publication Date:
February 14, 1983
Filing Date:
July 22, 1982
Export Citation:
Assignee:
BAYER AG
International Classes:
C07C265/14; C07C67/00; C07C241/00; C07C263/10; C08G18/10; C08G18/76; (IPC1-7): C07C118/02; C07C119/042
Attorney, Agent or Firm:
Kazuho Kawarada