Stabilized isocyanate compositions

Details Stabilized isocyanate compositions Stabilized isocyanate compositions

1978-02-22

1979-05-01

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

560 26, C07C119042, C07C12506

Patent

active

041523482

ABSTRACT:
Color stabilized isocyanates, particularly methylene-bridged aromatic isocyanates [methylenebis(phenyl isocyanate) and prepolymers thereof], are derived by incorporating in the isocyanate a color stabilizing amount of a compound of the formula ##STR1## wherein R.sub.1 =alkyl, aryl; R.sub.2 =alkyl; R.sub.3 =H, alkyl or aralkyl; and R.sub.1 and R.sub.2 taken together represent the residue of an oxazoline or oxazine. 2-Ethyloxazoline is a preferred color stabilizing compound. The above compounds can also be used to discharge undesirable colors which have developed in such isocyanates on storage.

REFERENCES:
patent: 3380959 (1968-04-01), Frump
patent: 3661861 (1972-05-01), Hunsucker
patent: 3846419 (1974-11-01), Seeliger et al.
patent: 3914189 (1975-11-01), Rudner et al.

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