Process for the preparation of isocyanates or isocyanate mixture

Details Process for the preparation of isocyanates or isocyanate mixture Process for the preparation of isocyanates or isocyanate mixture

1993-03-15

2000-10-31

Gorr, Rachel

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

560352, 560353, C08G 1870

Patent

active

061403822

ABSTRACT:
Isocyanates or isocyanate mixtures which are substantially free of color-imparting components are made by treating the isocyanate with hydrogen in the presence of a catalyst at a pressure of from about 3 to about 150 bar, a temperature of from about 100 to about 180.degree. C. for from about 15 minutes to about 4 hours. These isocyanates are particularly useful for the preparation of light-colored polyurethane rigid foams.

REFERENCES:
patent: 4465639 (1984-08-01), Hatfield, Jr.
patent: 4774357 (1988-09-01), Keggenhoff et al.
patent: 4876380 (1989-10-01), Chen et al.

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