C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 275/60 (2006.01) C08G 18/78 (2006.01) C08G 18/80 (2006.01) C09D 175/04 (2006.01)
Patent
CA 2185521
The present invention relates to polyisocyanates prepared from diphenylmethane diisocyanate wherein at least 95% of the isocyanate groups are blocked with diethyl malonate and wherein the polyisocyanates have, based on solids, A) a content of unblocked and blocked isocyanate groups (calculated as NCO) of 9% to 13%, B) a content of allophanate groups (calculated as C2HN2O3, molecular weight 101) of 3% to 9% and C) a calculated average functionality of 2.0 to 2.5. The present invention also relates to a process for the production of these polyisocyanates and to their use as crosslinking agents for organic polyhydroxyl compounds in polyurethane stoving lacquers.
Casselmann Holger
Engbert Theodor
Kobelka Frank
Pedain Josef
Schmalstieg Lutz
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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