Stabilized diphenylmethane diisocyanate prepolymer

Details Stabilized diphenylmethane diisocyanate prepolymer Stabilized diphenylmethane diisocyanate prepolymer

C - Chemistry, Metallurgy

08

G

260/455.4

C08G 18/72 (2006.01) C08G 18/10 (2006.01)

Patent

CA 1091242

STABILIZED DIPHENYLMETHANE DIISOCYANATE PREPOLYMER ABSTRACT OF THE DISCLOSURE Liquid 4,4'diphenylmethane diisocyanate (MDI) prepolymers have been produced which remain fluid and do not crystallize at temperatures below 40°F. These prepolymers comprise the re- action 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, polyethers and polyesters 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 and/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.

272313

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