Dichloroparabanic acid stabilized diphenylmethane diisocyanate-p

Details Dichloroparabanic acid stabilized diphenylmethane diisocyanate-p Dichloroparabanic acid stabilized diphenylmethane diisocyanate-p

1981-03-23

1982-06-01

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260453P, C07C119048

Patent

active

043327419

ABSTRACT:
Liquid reaction product mixtures of diphenylmethane diisocyanates and polymethylene polyphenyl isocyanates resulting from the thermal decomposition of the corresponding carbamates produced by the acid condensation of an N-aryl carbamic acid ester, such as ethylphenylcarbamate, with formaldehyde are storage stabilized against an increase in viscosity and decrease in free NCO content, by incorporating therein an effective amount of a dichloroparabanic acid compound having the formula ##STR1## wherein R is an alkyl group of from 1 to 4 carbon atoms or a phenyl group which may be substituted with a 1 to 4 carbon atom alkyl group.

REFERENCES:
patent: 3660456 (1972-05-01), Naito et al.
patent: 3962302 (1976-06-01), Rosenthal et al.
patent: 4162362 (1979-07-01), Shawl

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