Modified isocyanate compositions

Details Modified isocyanate compositions Modified isocyanate compositions

1981-01-02

1982-03-30

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260453AR, 260453AL, 260453SP, 521162, 528 44, 560 35, 560168, 260239A, C07C119048, C07C119055

Patent

active

043223648

ABSTRACT:
A process for the production of a modified isocyanate by reacting a composition containing carbodiimide groups and free isocyanate groups with a diester of an aliphatic dicarboxylic acid in the presence of oxalic or formic acid.
The process permits the production of liquid forms of diphenylmethane diisocyanate useful in the manufacture of polyurethanes.

REFERENCES:
patent: 3914269 (1975-10-01), Nersasian
patent: 4077989 (1978-03-01), Schafer et al.

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