C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
260/455.4
C08G 18/80 (2006.01)
Patent
CA 1234830
Mo-2626 PU-127-I 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 neopentyl glycol with diphenylmethane diisocyanate at a tempera- ture of from about 25°C to about 120°C in an amount such that said adduct 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 neopentyl 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 98 percent by weight, then said ratio is from 0.30:0.70 to 0.65:0.35, (ii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 98 percent by weight but not less than 90 percent by weight, then said ratio is from 0.30:0.70 to 0.75:0.25, (iii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 90 percent by weight but not less than 80 percent by weight, then said ratio is from 0.30:0.70 to 0.85:0.15 and (iv) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 80 percent by weight but not less than 65 percent by weight, then said ratio is from 0.30:0.70 to 0.95:0.05. The invention is also directed to a product produced from such process. Mo-2626
476942
Dewhurst John E.
Dormish Jeffrey F.
Pantone Richard S.
Mobay Chemical Corporation
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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