Liquid diphenylmethane diisocyanate compositions

Claim 2

A DIPHENYLMETHANE DIISOCYANATE COMPOSITION WHICH CONSISTS ESSENTIALLY OF A 4,4''-DIPHENYLMETHANE DIISOCYANATE CONTAINING NOT MORE THAN 10 PERCENT OF ISOMERS THEREOF, AND IN WHICH FROM 15 TO 30 PERCENT OF THE ISOCYANATE GROUPS HAVE BEEN REACTED AT A TEMPERATURE OF 40* TO 120*C WITH A MIXTURE OF THREE ALKYLENE GLYCOLS, SAID ALKYLENE GLYCOLS BEING SELECTED FROM THE GROUP CONSISTING OF DIETHYLENE GLYCOL, TRIETHYLENE GLYCOL, TETRAETHYLENE GLYCOL, 1,2-PROPYLENE GLYCOL, 1,3PROPYLENE GLYCOL, NEOPENTYL GLYCOL, 1,3-BUTANE DIOL AND 1,2BUTANE DIOL EACH OF SAID GLYCOLS BEING PRESENT IN SAID MIXTURE IN SUCH PROPORTIONS THAT NO ONE GLYCOL CONSTITUTES MORE THAN 50 OR LESS THAN 25 MOLAR PER CENT OF SAID TOTAL GLYCOLS.

Claim 3

Composition as claimed in claim 1 wherein the heating is carried out at a temperature of from 60* - 100*C.

Claim 4

Process for the manufacture of a diphenylmethane diisocyanate composition which is liquid at room temperature, which comprises reacting together diphenylmethane-4,4''-diisocyanate containing not more than 10 percent of isomers thereof with from 0.10 to 0.35 molar proportions of a mixture of alkylene glycols, said mixture containing at least three constituent glycols each containing at least three carbon atoms, each of said glycols being present in such proportion that no one glycol constitutes more than 50 or less than 25 molar per cent of the total glycols, at a temperature of from 40* - 120*C, said glycols being selected from the group consisting of diethylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, neopentyl glycol, 1,3-butane diol and 1,2-butane diol.

Claim 5

Process for the manufacture of a diphenylmethane diisocyanate composition which is liquid at room temperature, which comprises reacting together diphenylmethane-4,4''-diisocyanate containing not more than 10 percent of isomers thereof with from 0.10 to 0.35 molar proportions of a mixture of alkylene glycols, said mixture containing at least three constituent glycols each containing at least three carbon atoms, each of said glycols being present in such proportion that no one glycol constitutes more than 50 or less than 25 molar per cent of the total glycols, at a temperature of from 40* - 120*C, said glycols being selected from the group consisting of diethylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, neopentyl glycol, 1,3-butane diol and 1,2-butane diol.