C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/455.4
C07C 119/048 (1985.01) C07C 125/06 (1985.01)
Patent
CA 1216856
LIQUID DIPHENYLMETHANE DIISOCYANATE COMPOSITIONS ABSTRACT OF THE DISCLOSURE The invention is directed to a process for the production of an isocyanate which is both stable and liquid at room temperature comprising reacting an iso- cyanate selected from the group consisting of (a) a diphenylmethane diisocyanate containing from 25 to 70 percent, by weight, of the 4,4'-isomer, from 30 to 75 percent, by weight, of the 2,4'-isomer and from 0 to 10 percent, by weight, of the 2,2'-isomer, and (b) crude diphenylmethane diisocyanate, with a diol selected from the group consisting of 1-methyl-1,3-propane diol, 2,2-dimethyl-1,3-propane diol, 1,4-dimethyl-1,4-diethyl- 1,4-butane diol and 3-methyl-1,5-pentane diol, at a temperature of from 20 to 110°C, in a ratio such that the resultant product has an isocyanate group content of from 20 to 30%, by weight.
469635
Pantone Richard S.
Reiff Helmut F.
Marcoux & Sher Swabey Mitchell Houle
Mobay Chemical Corporation
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