Process for the preparation of highly pure aromatic diurethanes

Details Process for the preparation of highly pure aromatic diurethanes Process for the preparation of highly pure aromatic diurethanes

1992-12-10

1995-03-21

Dees, Jose G.

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

Organic compounds

Carboxylic acid esters

560158, C07C12506

Patent

active

053997360

ABSTRACT:
This invention relates to a process for the preparation of highly pure aromatic diurethanes and/or polyurethanes by reaction of the corresponding aromatic diamines and/or polyamines with unsubstituted carbamates with the release of ammonia. The reaction is carried out in the presence of excess carbamates. The resultant reaction mixture is freed from any solvents used, and the formed aromatic diurethanes and/or polyurethanes are purified by extraction with water.

REFERENCES:
patent: 2181663 (1939-11-01), Martin
patent: 3919278 (1975-11-01), Rosenthal et al.
patent: 4081472 (1978-03-01), Tsumura et al.
patent: 4278805 (1981-07-01), Merger et al.
patent: 4290970 (1981-09-01), Merger
patent: 4369141 (1983-01-01), Motier
patent: 4375000 (1983-02-01), Merger et al.
patent: 4388238 (1983-06-01), Heitkamper et al.
patent: 4388246 (1983-06-01), Sundermann et al.
patent: 4482499 (1984-11-01), Merger et al.
patent: 4611079 (1986-09-01), Merger
patent: 4692550 (1987-09-01), Engbert et al.

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