Preparation of biuret polyisocyanates

Details Preparation of biuret polyisocyanates Preparation of biuret polyisocyanates

1970-06-17

1977-09-27

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 25AT, 260 775AT, C07C119042

Patent

active

040511650

ABSTRACT:
A method of preparing biuret polyisocyanates by reacting diisocyanates with up to about 0.4 mol per mol of diisocyanate of a monohydric tertiary alcohol in the presence of from about 0.001 to about 0.1 mol per mol of tertiary alcohol of a catalyst consisting of salts and salt mixtures of nitrogen containing bases and organic or inorganic acids at a temperature of between about 60.degree. and about 210.degree. C. The volume/time yield of biuret polyisocyanate according to this process is from 3 to 5 times greater than volume/time yields obtained with comparative known methods.

REFERENCES:
patent: 2842506 (1958-07-01), Roussel
patent: 2973361 (1961-02-01), Rudner
patent: 3239480 (1966-03-01), Windemuth et al.
patent: 3358010 (1967-12-01), Britain
"Kirk-Othmer Encyclopedia of Chemical Technology," Second Edition, vol. 12, Interscience Publishers, Inc., New York, NY 1967, pp. 45, 48-50.

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