EP 2714649 A2 20140409 - PROCESS FOR PREPARING POLYISOCYANATES
Title (en)
PROCESS FOR PREPARING POLYISOCYANATES
Title (de)
VERFAHREN ZUR HERSTELLUNG VON POLYISOCYANATEN
Title (fr)
PROCÉDÉ DE PRODUCTION DE POLYISOCYANATES
Publication
Application
Priority
- EP 11168028 A 20110530
- EP 2012059993 W 20120529
- EP 12726063 A 20120529
Abstract (en)
[origin: WO2012163894A2] The invention provides a multistage process for continuously preparing organic polyisocyanates, preferably diisocyanates, more preferably aliphatic or cycloaliphatic diisocyanates, by reacting the corresponding organic polyamines with carbonic acid derivatives and alcohols to give low molecular weight monomeric polyurethanes and cleaving the latter. The invention further provides a corresponding preparation process in which the polyisocyanates prepared and unutilizable residues are removed at particular reaction stages, and reusable by-products and intermediates are recycled into preceding stages.
IPC 8 full level
C07C 263/06 (2006.01)
CPC (source: EP)
C07C 263/06 (2013.01); C07C 273/1863 (2013.01)
Citation (search report)
See references of WO 2012163894A2
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2012163894 A2 20121206; WO 2012163894 A3 20130718; CN 103596920 A 20140219; EP 2714649 A2 20140409; JP 2014524892 A 20140925
DOCDB simple family (application)
EP 2012059993 W 20120529; CN 201280027059 A 20120529; EP 12726063 A 20120529; JP 2014513151 A 20120529