Selective process for the preparation of diphenylmethane bis-(di

Details Selective process for the preparation of diphenylmethane bis-(di Selective process for the preparation of diphenylmethane bis-(di

1992-10-19

1993-06-15

Dees, Jose G.

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

Organic compounds

Amino nitrogen containing

564 55, C07C27318

Patent

active

052200612

ABSTRACT:
A selective process for the preparation of diphenylmethane bis(dialkylureas) is disclosed. An alkyl phenylcarbamate or an N,N-dialkyl-N'-phenylurea is reacted with a methylene bis(alkyl carbamate) in the presence of an acid catalyst. The use of a staged addition of phenylcarbamate or phenylurea to the methylene bis(carbamate) and the use of a ramped temperature program are the keys to good selectivity to MDI dimer products.

REFERENCES:
patent: 4422871 (1988-12-01), Schirmer et al.
patent: 4820871 (1989-04-01), Kissener et al.
patent: 4996359 (1991-02-01), Kesling, Jr. et al.

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