公开(公告)号：DE50100705D1

公开(公告)日：2003-11-06

申请号：DE50100705

申请日：2001-12-04

Applicant: BASF AG

Inventor： MURRAR IMBRIDT ,  PLAUMANN DR ,  WINKLER JUERGEN ,  SCHUSTER MARITA

IPC: C07C273/18 ,  C08G18/16 ,  C08G18/40 ,  C08G18/78

Abstract: Highly functional aromatic polyisocyanates are prepared by reacting aromatic polyisocyanates, if required as a mixture with further mono- and/or polyisocyanates, with addition of catalytic acidic substances and water, by a process wherein the aromatic polyisocyanates used comprise at least one tolylene diisocyanate and the catalytic acidic substance used is at least one alkyl and/or aralkyl phosphate, and the process is carried out in such a way that the water is added with a temperature/time gradient increase from 5 to 60°/hour and until an isocyanate modification of the starting NCO terminal groups from 1 to 80% is established. The highly functional aromatic polyisocyanates prepared by this process are used for the preparation of polyurethane foams, in particular flexible polyurethane foams.