4,4 -diphenylene methane diisocyanate

Two series of polyether polyurethanes (PU) based on hydroquinone bis (P-hydroxyethyl) ether (HQEE) or 1,4-butanediol (BDO) as a chain extender were prepared by the one step bulk polymerisation process. By varying the mole ratio of poly tetra methylene oxide (PTMO) extender (with Mn = 1000 and Mn = 2000) and 4,4 -diphenylene methane diisocyanate (MDI) the two series of HQEE (PUlOOOHj, PU 1000H2, PU2000Hj,... 

Synonyms 4,4 -diphenyl methane diisocyanate 4,4 -diisocyanodiphenylmethane MBI 4,4 -methylenediphenyl diisocyanate PMDI methylene bis(phenylisocyanate) diphenyl methane diisocyanate 4,4 -methylene bisphenyl isocyanate methylene diphenyl diisocyanate i,i -methylene bis(4-isocyanato)-benzene methylenebis(4-isocyanatobenzene) bis(p-isocyanatophenyl)methane i,i-methylenebis(4-isocyanatobenzene) bis(i,4-isocyanatophenyl)methane methylene bis(p-phenylene isocyanate) Caradate 30 Desmodur 44 4,4 diisocyanatodiphenylmethane Hylene M50 Isonate 125M Isonate 125MF methylene bis(p-phenyl isocyanate) methylene di-p-phenylene diisocyanate 4,4 -methylene diphenylene isocyanate Nocconate 300 methylene di-p-phenyl diisocyanate diphenylmethyl diisocyanate methylene bisphenyl isocyanate MDI... 

The production of aniline is a major international business, carried on in the US, Europe and Asia, mainly for the conversion, by reaction with formaldehyde under acid-catalyzed conditions, into diaminodiphenylmethanes 9a, 9b and 9c, and then into isocyanates, mainly 4,4/-methylenebis(phenylisocyanate) (MDI, also known as 4,4 -methylene-di-paraphenylene isocyanate, 4,4 -diphenylmethane diisocyanate, methylene diphenylene diisocyanate and diisocyanato diphenyl methane) (9d), from which polyurethanes are produced. This accounts for well over 60% of total demand (Figure 1). Aniline is also used in bulk for the production of antioxidants and vulcanization accelerators for rubber. Some 15.5 million lbs. of cyclohexylamine are made each year mainly by catalytic hydrogenation of aniline. Half the demand is for use as a boiler water additive. Other major uses include in the manufacture of herbicides, plasticizers, emulsifying agents, dyes, dry-cleaning soaps, acid gas absorbents and, in Asia, cyclamate sweeteners. Apart from India, the use of aniline for dyestuff manufacture represents about 10% of demand. 

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