Preparation of mixtures of diphenylmethane diisocyanates and pol

Details Preparation of mixtures of diphenylmethane diisocyanates and pol Preparation of mixtures of diphenylmethane diisocyanates and pol

1991-06-28

1993-05-04

Dees, Jose G.

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

Organic compounds

Isocyanate esters

560347, 560352, C07C24914

Patent

active

052083683

ABSTRACT:
Mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates (crude MDI) of reduced iodine color number are prepared by reacting the corresponding mixtures of diphenylmethanediamines and polyphenylpolymethylenepolyamines with phosgene in the presence of at least one inert organic solvent at elevated temperature, at least one monohydric or polyhydric polyoxyalkylene alcohol, preferably having a functionality of from 2 to 3, and advantageously having a hydroxyl number of from 20 to 1800, or mixtures thereof in an effective amount, expediently in an amount of from 0.1 to 10% by weight, based on the weight of the crude MDI, being introduced into the reaction mixture when the phosgenation is complete, the phosgene and the inert organic solvent then being removed, up to 5% by weight, based on the weight of crude MDI, of at least one phenol-based antioxidant and/or aryl phosphite being added, if desired to the reaction product, and the reaction mixture being heated.

REFERENCES:
patent: 3226411 (1965-12-01), Smith
patent: 3394164 (1968-07-01), McClellan et al.
patent: 3449256 (1969-06-01), Farrissey et al.
patent: 3585229 (1971-06-01), Christian et al.

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