Polyamines and processes for the production of such polyamines a

Details Polyamines and processes for the production of such polyamines a Polyamines and processes for the production of such polyamines a

1981-10-05

1983-05-31

Waltz, Thomas A.

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

Organic compounds

Amino nitrogen containing

564 57, 564 59, 564 61, 564511, 564512, 560159, 528 68, C07C12715, C07C12724

Patent

active

043862187

ABSTRACT:
A compound having a terminal isocyanate group is hydrolyzed to produce a polyamine having a urethane and/or a urea and/or a biuret group. More particularly, a carbamate is made by mixing an isocyanate prepolymer having urethane and/or urea and/or biuret groups present with aqueous base solutions at a temperature of from 0.degree. to 0.degree. C. and in quantities such that the equivalent ratio of hydroxyl to isocyanate groups is between from 0.3:1 to .gtoreq.1.01 to 1. The carbamate is then treated with an acid ion exchanger to form an amine. The amine is then removed from any other material which may be present. A preferred polyamine thus-produced corresponds to the general formula: ##STR1## in which each R radical may represent a divalent straight or branched-chain aliphatic radical; a divalent cycloaliphatic radical; a 4,4'- and/or a 2,4'-dicyclohexylmethane radical; or a 2,4- and/or 2,6-methyl cyclohexane radical. Such an amine may be reacted with a polyisocyanate and optionally with other known additives to form a polyurethane plastic or foam.

REFERENCES:
patent: 3955774 (1976-05-01), Kalopissis et al.
patent: 4303780 (1981-12-01), Bellos
patent: 4324739 (1982-04-01), Zondler et al.
Sidgwick, Sidgwick's Organic Chem. of Nitrogen, 3rd edition, pp. 236-237 (1966).
"Spectrophotometric Determination of Aliphatic Isocyanates in the Occupational Atmosphere", Analyst, Walker et al., Oct., 1979, vol. 104, pp. 928-936.

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