Liquid diphenylmethane diisocyanate compositions

Details Liquid diphenylmethane diisocyanate compositions Liquid diphenylmethane diisocyanate compositions

C - Chemistry, Metallurgy

08

G

260/455.4

C08G 18/80 (2006.01)

Patent

CA 1234831

Mo-2628 PU-127-III LIQUID DIPHENYLMETHANE DIISOCYANATE COMPOSITIONS ABSTRACT OF THE DISCLOSURE The present invention is directed to a process for the preparation of a stable, liquid adduct compris- ing reacting a mixture of 1,3-butane diol and propylene glycol with diphenylmethane diisocyanate at a tempera- ture of from about 25°C to about 120°C in an amount such that the resultant product has an isocyanate group content of from about 20 to about 30 percent by weight, and wherein the ratio of mole equivalents of 1,3-butane diol to mole equivalents of propylene glycol is from 0.05:0.95 to 0.95:0.05, with the further proviso that (i) if the 4,4'-isomer content of the diphenylmethane diisocyanate is equal to or greater than 90 percent by weight, then said ratio is from 0.45:0.55 to 0.70:0.30, and (ii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 90 percent by weight, but not less than 70 percent by weight, then said ratio is from 0.30:0.70 to 0.85:0.15. The invention is also directed to a product produced from such process. Mo-2628 PU-127-III

476943

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