公开(公告)号：MX168491B

公开(公告)日：1993-05-27

申请号：MX320986

申请日：1986-07-21

Applicant: BASF AG

Inventor： STRAEHLE WOLFGANG ,  MARX MATTHIAS ,  SCHETT UWE

IPC: C08G18/38 ,  C08G18/40 ,  C08G18/64 ,  C08G18/65 ,  C08L75/04

Abstract: The invention relates to a process for preparing high temperature-resistant dense or cellular polyurethane elastomers by reacting the following, preferably using low-pressure processing techniques: (a) organic polyisocyanates, preferably in the form of isocyanate group-containing prepolymers and/or modified urethane group-containing organic polyisocyanates, with (b) relatively high molecular weight compounds having at least 2 reactive hydrogen atoms, (c) urea derivatives and, optionally, (d) chain extenders and/or cross-linking agents in the presence of (e) catalysts and, optionally, (f) blowing agents (g) auxiliaries and/or additives wherein amino and/or hydroxyl group-substituted ureas and/or polyureas having molecular weights from 200 to 4000 are also used as the urea derivatives. Said ureas and/or polyureas are prepared by reacting organic diisocyanates with primary aliphatic and/or cycloaliphatic diamines and/or alkanolamines in molar ratios of from 1:1.1 to 1:2, preferably in the presence of polyester or polyether polyols as solvents or diluting agents.