C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 265/14 (2006.01) C07C 263/00 (2006.01) C07C 263/10 (2006.01) C07C 263/20 (2006.01) C08G 18/70 (2006.01)
Patent
CA 2146512
Isocyanates or isocyanate mixtures which contain no appreciable amounts of color causing materials are produced by phosgenating the amine corresponding to the desired isocyanate and treating the isocyanate-containing phosgenation mixture with hydrogen in the presence of a supported catalyst. The supported catalyst is in a form such that its shortest dimension is from about 0.3 to about 3.0 mm. This catalyst has a BET surface of from about 0.5 to about 150 m2/g. No alkali material can be present in the catalyst. These isocyanates are particularly useful for the production of light-colored foams.
Buysch Hans-Josef
Gallus Manfred
Gebauer Herbert
Immel Otto
Langer Reinhard
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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