Process for the preparation of polyamines and their use for the

Details Process for the preparation of polyamines and their use for the Process for the preparation of polyamines and their use for the

1988-03-24

1989-06-27

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521163, 528 44, 528 48, 528 52, 528 57, 564305, 564395, 564414, 564444, C08G 1814

Patent

active

048431079

ABSTRACT:
Polyamines containing primary amino groups are made by a one-shot process for the hydrolysis of prepolymers containing isocyanate end groups and having an isocyanate content of from 0.5 to 40 weight % with 0.75 to 40 mol of water per equivalent of isocyanate groups in the presence of very small quantities of sodium hydroxide in certain organic, polar solvents. The compounds containing isocyanate groups used for this process are isocyanate prepolymers (preferably containing urethane groups). Hydrolysis according to this process leads directly to the polyamines with elimination of carbon dioxide. These polyamines may be isolated by the usual methods and the removal of the small quantities of catalyst may advantageously be omitted. These polyamines are useful for the preparation of polyurethane(urea)s.

REFERENCES:
patent: 4386218 (1983-05-01), Rasshofer et al.
patent: 4515923 (1985-05-01), Fauss et al.
patent: 4540720 (1985-09-01), Rasshofer
patent: 4565645 (1986-01-01), Rasshofer et al.
The Organic Chemistry of Nitrogen by N. V. Sidgwick, Clarendon Press, Oxford, p. 326, 1966.
Advanced Organic Chemistry: Reactions, Mechanisms, and Structure, by J. March, McGraw Hill, p. 658, 1968.
The Organic Chemistry of Nitrogen by N. V. Sidgwick, Claredon Press, Oxford, p. 236, 1966.

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