Liquid diphenylmethane diisocyanate compositions

• US 3,883,571 A
• Filed: 09/10/1973
• Issued: 05/13/1975
• Est. Priority Date: 09/26/1972
• Status: Expired due to Term

• Current Assignee: Dennis Charlton Allport, Graham Briggs
• Original Assignee: Dennis Charlton Allport, Graham Briggs
• Inventors: Allport, Dennis Charlton, Briggs, Graham
• Primary Examiner(s): Gotts, Lewis
• Assistant Examiner(s): Torrence, Dolph H.
• Application Number:
  US05/395,599
• Time in Patent Office: 610 Days
• Field of Search: 260/453SP,453AM
• US Class Current: 560/351
• CPC Class Codes: C07C 265/14 containing at least two isocyanate groups bound to the same carbon skeleton
• CPC Class Codes: C08G 18/7664 containing alkylene polyphenyl groups
• CPC Class Codes: C08G 18/8019 Masked aromatic polyisocyanates

Abstract

A diphenylmethane diisocyanate composition which comprises diphenylmethane diisocyanate in which from 10 to 35 percent of the isocyanate groups have been reacted with a mixture of alkylene glycols containing at least three carbon atoms. The composition is made by heating together the reactants.

Claims

1. 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.

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

3. 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.