46881-07-6

Basic information

• Product Name: biphenyl-2,4'-diyl diisocyanate
• CAS NO: 46881-07-6
• Molecular Weight: 236.23
• Mol File: 46881-07-6.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: biphenyl-2,4'-diyl diisocyanate(CAS DataBase Reference)
• NIST Chemistry Reference: biphenyl-2,4'-diyl diisocyanate(46881-07-6)
• EPA Substance Registry System: biphenyl-2,4'-diyl diisocyanate(46881-07-6)

Safety Data

• Hazardous Substances Data: 46881-07-6(Hazardous Substances Data)

Upstream product

• 75-44-5 phosgene 
• 50-00-0 formaldehyd 

Relevant articles and documents

Process for the preparation of highly pure 2,4'-methylenediphenyldiisocyanate

In the production of a diphenylmethanedi-isocyanate fraction containing at least 99 wt% binuclear di-isocyanate by reaction of aniline and formaldehyde followed by phosgenation and separation, the crude product is worked up by removal of some or all of the 2,2'-MDI to give a fraction containing 0-0.4 wt% 2,2'-MDI, 1-95 wt% 4,4'MDI and 5-98.6 wt% 2,4'-MDI. A method for the production of a diphenylmethanedi-isocyanate (MDI) fraction (I) containing at least 99 wt% binuclear MDI, involves (a) acid-catalysed reaction of aniline and formaldehyde to give di- and poly-amines, (b) phosgenation (optionally in solvent) to give crude di- and poly-isocyanate, (c) separation to give a faction containing at least 95 wt% binuclear MDI with a 4,4'-MDI content of 49-95.99 wt%, a 2,4'-MDI content of 4-45 wt% and a 2,2'-MDI content of 0.01-20 wt%, (d) optional removal of 10-98 wt% of the 4,4'-MDI and (e) removal of some or all of the 2,2'-MDI to give a fraction containing 0-0.4 wt% 2,2'MDI, 1-95 wt% 4,4'-MDI and 5-98.6 wt% 2,4'-MDI. An independent claim is also included for a method for the production of polyurethanes and prepolymers by reacting (I) with polyethers or polyesters.