C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 263/10 (2006.01) C07C 209/78 (2006.01) C07C 265/12 (2006.01) C08G 18/32 (2006.01) C08G 18/76 (2006.01) C07C 211/50 (2006.01) C07C 265/14 (2006.01)
Patent
CA 2421395
Polyisocyanates of the diphenyl methane series having reduced color values are obtained by a) reacting aniline and formaldehyde in the presence of an acid catalyst to form a polyamine, b) neutralizing the reaction mixture containing polyamine with a base, c) separating the neutralized mixture into the aqueous and the organic phases, d) adding a base to the organic phase and then e) phosgenating the resulting polyamine to produce the corresponding polyisocyanate.
Hagen Torsten
Kaemper Friedhelm
Koch Daniel
Uchdorf Rudolf
Wershofen Stefan
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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