Method for making a polyamine

Details Method for making a polyamine Method for making a polyamine

1974-04-26

1980-02-19

Hines, Robert V.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260570D, 260453AM, C07C 8520, C07C11904

Patent

active

041894430

ABSTRACT:
A process is provided for making an aromatic polyamine by condensing an aromatic amine with formaldehyde wherein the reaction mixture is maintained at a boiling temperature under reflux and formaldehyde is mixed with the stream of condensed vapors returning to the reactor from the reflux condenser. The process produces a diphenylmethane polyamine particularly well suited for phosgenation to form the corresponding polyisocyanate.

REFERENCES:
patent: 1803331 (1931-05-01), Kladiyko
patent: 1954484 (1934-04-01), Mattison
patent: 2818433 (1957-12-01), Erickson
patent: 2974168 (1961-03-01), Sharp et al.

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