Methylene bisphenyl diisocyanate

Isocyanate is added to provide an equivalent ratio of 1.5-2 isocyanatc/alcohol. The higher the ratio, the more free isocyanate, and diisocyanate monomer, and the lower the viscosity. Most common is 4,4 -methylene bisphenyl diisocyanate (MDl). Its saturated analog or other aliphatic isocyanates are used where light stability is critical. Most common is isophorone diisocyanate. 

Precaution Combustible moderate fire risk incompat. with strong oxidizers, halogen gases, halogenated compds., 2,4,6-trichloro-1,3,5-triazine vigorous reactions possible polymerizes violently on contact with methylene bisphenyl diisocyanate Hazardous Decomp. Prods. On decomp., emits toxic fumes of NOx... 

A polycarbonate TPE polyurethane that claims biostability is achieved through its replacement of virtually all ether or ester linkages with carbonate groups. The soft segment is composed of a polycarbonate diol formed by the condensation reaction of 1,6-hexanediol with ethylene carbonate. The polycarbonate diol is converted to a high molecular weight polyurethane by the reaction with 1,4-methylene bisphenyl diisocyanate (MDI) and 1,4-butanediol. It is reported to be resistant to environmental stress cracking as experienced with insulation on pacemaker lead wires. The polymer can be extruded, injection molded or compression-molded, and can be bonded with conventional urethane adhesives and solvents (Tables 4.4, 4.12, 4.13, and 4.14). 

Diphenylmethane diisocyanate, see Isocyanates Methylene bisphenyl isocyanate... 

Monoethanoamine, diethanolamine, ethylenediamine H2N-CH2-CH3-NH2 Acetonitrile CH3-CN, acrylonitrile CH2=CH-CN, calcium cyanamide N=Ca, o-chlorobenzylidene malonitrile ClCgH4CH=C (CN)2, hydrogen cyanide HCN Toluene diisocyanate (TDl), methylene bisphenyl isocyanate (MDl)... 

Sensitizer. A chemical that causes vulnerable, exposed individuals to develop a respiratory allergic reaction following repeated exposure. Methylene bisphenyl isocyanate, toluene diisocyanate, and trimellitic anhydride are examples of respiratory sensitizers. It should be noted that sensitizing chemicals that are inhaled have the propensity to also induce dermal sensitization and that skin exposure to sensitizers (e.g., ammonium thioglycolate) can induce respiratory sensitization. Such cross-sensitization is discussed below and in Chapter 29. 

Alternative Names/Abbreviations Diphenylmethane diisocyanate, methylene bisphenyl isocyanate, MDI... 

Synonyms Bis (1,4-isocyanatophenyl) methane Bis (4-isocyanatophenyl) methane Bis (p-isocyanatophenyl) methane 4,4 -Diisocyanatodiphenylmethane Diphenylmethane diisocyanate Diphenylmethane-4,4 -diisocyanate 4,4 -Diphenylmethane diisocyanate p,p -Diphenylmethane diisocyanate MBI 1,1-Methylenebis (4-isocyanatobenzene) Methylenebis (4-isocyanatobenzene) Methylenebis (p-phenylene isocyanate) Methylene bisphenyl isocyanate Methylene diphenyl diisocyanate Methylene di (phenylene isocyanate)... 

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... 

Methylene bisphenyl-4,4 -diisocyanate Paraphenylene diisocyanate crude Polymethylene polyphenyl isocyanate Toluene-1,3-diisocyanate Toluene-2,4-diisocyanate Toluene-2,4-diisocyanate >70% Toluene-2,6-diisocyanate... 

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