C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/44 (2006.01) C08G 18/12 (2006.01) C08G 18/40 (2006.01) C09K 3/10 (2006.01)
Patent
CA 2156011
Isocyanate prepolymers having an NCO content of 1.5 to 5.0 wt.% and a monomeric diisocyanate content of less than 0.5 wt.% which are the reaction products of A) aromatic or cycloaliphatic diisocyanates with B) mixtures of B1) polyether polyols having a molecular weight of 1000 to 3000 and B2) polyester carbonate diols having a molecular weight of 700 to 3000, wherein components B1) and B2) are present in a weight ratio of 0.25:1 to 1.5:1; a process for the preparation of these isocyanate prepolymers by reacting the preceding starting materials at an NCO/OH equivalent ratio of at least 1.5:1 and optionally with subsequent removing unreacted monomeric diisocyanate by distillation; and the use of these isocyanate prepolymers as binders for sealing or coating compositions.
Hortelano Edwin R.
Rettig Rainer
Schmalstieg Lutz
Walter Ulrich
Aktiengesellschaft Bayer
Corporation Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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