C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 275/60 (2006.01) C08G 18/78 (2006.01) C09D 175/04 (2006.01)
Patent
CA 2204084
The present invention relates to a process for the production of polyisocyanatescontaining heteroallophanate groups and aromatically bound isocyanate groups by reacting a) a di- and/or polyurethane component which is substantially free from isocyanate groups and is based on the reaction product of a1) a linear aliphatic isocyanate component and a2) a hydroxyl group-containing component having an average OH functionality of 1 to 1.75 with b) an isocyanate component containing at least 90 wt.% of 2,4- and/or 2,6-diisocyanatotoluene to form allophanate groups at a ratio of NCO groups to urethane groups of 3:1 to100:1 and removing excess distillable isocyanate component b) to a content below0.5%. The present invention also relates to the use of the polyisocyanate compounds asbinders for coating, adhesive, sealant and polymer molding compositions.
Arning Eberhard
Brahm Martin
Rettig Rainer
Schmalstieg Lutz
Schwindt Jurgen
Aktiengesellschaft Bayer
Swabey Ogilvy Renault
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