C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/131, 403/14,
C08G 18/38 (2006.01) C08G 18/40 (2006.01) C08G 18/64 (2006.01)
Patent
CA 1266945
PROCESS FOR THE PREPARATION OF HIGH-TEMPERATURE- RESISTANT DENSE OR CELLULAR POLYURETHANE ELASTOMERS Abstract of the Disclosure 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 dilsocyanates with primary aliphatic and/or cyclo- aliphatic 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.
514041
Marx Matthias
Schuett Uwe
Straehle Wolfgang
Basf Aktiengesellschaft
Robic Robic & Associes/associates
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