C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/48 (2006.01) C07C 209/78 (2006.01) C07C 263/10 (2006.01) C08G 18/32 (2006.01) C08G 18/76 (2006.01) C07C 211/50 (2006.01) C07C 265/14 (2006.01)
Patent
CA 2399483
Polyisocyanates of the diphenylmethane series are produced by a) reacting aniline and formaldehyde in the presence of an acidic catalyst to produce a polyamine, b) neutralizing the reaction mixture from step a) with a base at a temperature of more than 110°C or neutralizing the reaction mixture from step a) with a base and heating the neutralized mixture to a temperature of more than 110°C, and c) phosgenating the polyamine from step b) to convert it to the corresponding polyisocyanate.
Kamper Friedhelm
Koch Daniel
Muller Heinz-Herbert
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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