Process for the preparation of low molecular weight 4,4'-dipheny

Details Process for the preparation of low molecular weight 4,4'-dipheny Process for the preparation of low molecular weight 4,4'-dipheny

1982-08-02

1985-06-04

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D22900

Patent

active

045213380

ABSTRACT:
Low molecular weight 4,4'-diphenylmethane-uretdione-diisocyanates corresponding to the formula: ##STR1## wherein n is a number from 0 to 1,
are made by dimerizing diphenylmethane-4,4'-diisocyanate at a temperature of 50.degree. C. or less in a mixture of non-polar and moderately polar solvents in the presence of a dimerization catalyst. The dimerization product may then be worked up at low temperatures (i.e., .ltoreq.50.degree. C.). The dimerization products of diphenylmethane-diisocyanate thus obtained generally have only a small amount of oligomeric uretdione-diisocyanates present. These dimerization products may be used advantageously in the synthesis of polyurethanes.

REFERENCES:
patent: 2683144 (1954-07-01), Balon et al.
patent: 3290288 (1966-12-01), Oertel et al.
patent: 3919195 (1975-11-01), Bakhitov et al.
patent: 3993641 (1976-11-01), Tiemann et al.
patent: 4022752 (1977-05-01), Horn et al.
J. Org. Chem. 8 23, 1943.

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