Color reduction of polymeric isocyanates via multiple solvent fr

Details Color reduction of polymeric isocyanates via multiple solvent fr Color reduction of polymeric isocyanates via multiple solvent fr

1988-08-31

1989-10-24

Siegel, Alan

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

Organic compounds

Isocyanate esters

C07C14300

Patent

active

048763802

ABSTRACT:
Disclosed is an extraction process wherein a crude polyisocyanate is separated into a purified fraction and residual fraction wherein the purified fraction is characterized by greatly improved color over the crude material but with little or no difference in viscosity. The residual fraction remains perfectly useful for those applications where color is not a critical requirement.
Significantly, the disclosed purification is achieved with literally a 100 percent material balance. No loss in polyisocyanate is encountered.

REFERENCES:
patent: 3211631 (1965-10-01), Fuchs
patent: 3479384 (1969-11-01), Heiss
patent: 3892634 (1975-07-01), Hajek et al.
patent: 3912600 (1975-10-01), Hatfield et al.
patent: 4189354 (1980-02-01), Ellendt et al.
patent: 4193932 (1980-03-01), Yamamoto et al.

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