Patent · US Expired

Process for the production of isocyanates and for the production of light-colored foams therefrom

US5583251A · kind A · utility

4Cited by

7References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Hans-Josef Buysch · Krefeld, DE
Manfred Gallus · Krefeld, DE
Herbert Gebauer · Krefeld, DE
Otto Immel · Krefeld, DE
Christine Mendoza-Frohn · Erkrath, DE
Reinhard Langer · Krefeld, DE

Key dates

Filing date	Mar 31, 1995
Grant date	Dec 10, 1996
Priority date	—
Expiry date	Mar 31, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C263/10
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

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 m.sup.2 /g. No alkali material can be present in the catalyst. These isocyanates are particularly useful for the production of light-colored foams.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.