Preparation of partially carbodiimidized methylenebis (phenyl is

Details Preparation of partially carbodiimidized methylenebis (phenyl is Preparation of partially carbodiimidized methylenebis (phenyl is

1978-05-05

1979-05-15

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260239A, 260453AM, C07C119055

Patent

active

041547527

ABSTRACT:
The instant invention is directed to storage stable liquid, partially carbodiimidized methylenebis(phenyl isocyanate) and to the method of manufacture thereof. The products of the instant invention are produced by heating methylenebis(phenyl isocyanate) at a temperature of from 150.degree. to 300.degree. C. in the presence of from 1 ppb to 10 ppm of a phospholine oxide catalyst. The reaction mixture is then cooled once the desired isocyanate content has been reached. The resultant product can be used to produce a variety of isocyanate-addition reaction products, including polyurethanes, polyureas and the like.

REFERENCES:
patent: 3152162 (1964-10-01), Fischer et al.
patent: 3761502 (1973-09-01), Kan et al.
patent: 4014935 (1977-03-01), Ibbotson
patent: 4088665 (1978-05-01), Findeisen et al.

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