Process for the production of light-colored isocyanates

Details Process for the production of light-colored isocyanates Process for the production of light-colored isocyanates

2008-05-06

2008-05-06

Jiang, Shaojia Anna (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

C560S336000, C560S338000

Reexamination Certificate

active

07368595

ABSTRACT:
The invention relates to an improved process for the production of isocyanates by the reaction of an amine or a mixture of two or more amines with phosgene, the improvement involving the phosgene containing less than about 100 ppm of sulfur in elemental or bound form. The inventive process yields light-colored isocyanates that are suitable for the production of polyurethanes or their precursors (e.g. prepolymers) without the treatment processes heretofore required.

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Database Caplus [Online] Chemical Abstracts Service, Columbus, Ohio, US; Manabe, Akiyoshi et al: “Polycarbonates with excellent color tone and durability and their manufacture” XP002435080 Database accession No. 2000:580011 & JP 2000 230046 A (Teijin Chemicals Ltd., Japan) Aug. 22, 2000.

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