Process for the production of poly(O-alkylurethanes) of the diph

Details Process for the production of poly(O-alkylurethanes) of the diph Process for the production of poly(O-alkylurethanes) of the diph

1992-04-21

1994-09-13

Dees, Jose G.

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

Organic compounds

Carboxylic acid esters

560 24, C07C26100

Patent

active

053470346

ABSTRACT:
The present invention relates to an improved process for the production of monomeric and polymeric poly(O-alkylurethanes) of the diphenyl methane series. The process comprises the reaction of the corresponding amines with dialkyl carbonates in the presence of a catalyst, followed by the isolation of the products in a highly pure form. The invention also relates to the use of the produced monomeric and polymeric poly(O-alkylurethanes) for the production of the corresponding isocyanates.

REFERENCES:
patent: 3763217 (1973-10-01), Brill
patent: 4450188 (1984-05-01), Kawasumi

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