Stabilized diphenylmethane diisocyanate prepolymer

Details Stabilized diphenylmethane diisocyanate prepolymer Stabilized diphenylmethane diisocyanate prepolymer

1977-09-26

1978-11-14

Cockeram, H.S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 18TN, 260453A, 260453P, 528 67, 528 76, 528 81, C09F 706, C07C11800, C08L 9100

Patent

active

041255453

ABSTRACT:
Liquid 4,4'diphenylmethane diisocyanate (MDI) prepolymers have been produced which remain fluid and do not crystallize at temperatures below 40.degree. F. These prepolymers comprise the reaction product of a polyol, 4,4'diphenylmethane diisocyanate (MDI) and an aliphatic and/or cycloaliphatic diisocyanate. The polyol employed is selected from the group consisting of castor oil, polyoxypropylene glycol, polyhydric alcohol mono- and di-esters of hydroxyacids of at least 12 carbon atoms and mixtures thereof.
The reaction product contains the polyol in amount from about 10% to about 40%, the 4,4'diphenylmethane diisocyanate in amount from about 50% to about 70% and the aliphatic or cycloaliphatic isocyanate in amount from about 10% to about 20%. The prepolymer should be prepared such that the NCO/OH ratio should fall within the range of about 3 to about 7.

REFERENCES:
patent: 3143517 (1964-08-01), Heiss
patent: 3591560 (1971-07-01), Wagner et al.
patent: 3790508 (1974-02-01), Triolo
patent: 3925319 (1975-12-01), Hiatt et al.

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