4,4'-DIPHENYLMETHANE DIISOCYANATE

PRODUCT IDENTIFICATION

CAS NO. 101-68-8

4,4'-DIPHENYLMETHANE DIISOCYANATE

EINECS NO. 202-966-0
FORMULA CH2(C6H4NCO)2
MOL WT. 250.25
H.S. CODE  

TOXICITY

 
SYNONYMS MDI; MDR; Methylbisphenyl isocyanate;
4,4'-Diphenylmethane diisocyanate; Methylenebis(4-phenylisocyanate); 1,1'-Methylenebis(4-isocyanatobenzene); 4,4'-Diisocyanatodiphenylmethane; 4,4'-Diphenylmethane diisocyanate; 4,4'-Diphenylmethanediisocyante; 4,4'-Methylenebis(phenyl isocyanate); 4,4'-Methylenedi-p-phenylene diisocyanate; 4,4'-Methylenediphenyl diisocyanate; 4,4'-Methylenediphenyl isocyanate; 4,4'-Methylenediphenylene isocyanate; 4-4'-Diisocyanate de diphenylmethane; Benzene, 1,1'-methylenebis(4-isocyanato-; Bis(1,4-isocyanatophenyl)methane; Bis(4-isocyanatophenyl)methane; Bis(p-isocyanatophenyl)methane; Bis(para-isocyanatophenyl)methane; Di(4-isocyanatophenyl)methane; Difenil-metan-diisocianato; Difenylmethaan-dissocyanaat; Diphenyl methane diisocyanate; Diphenylmethan-4,4'-diisocyanat; Diphenylmethane diisocyanate; Diphenylmethyl diisocyanate; Isocyanic acid, ester with diphenylmethane; Isocyanic acid, methylenedi-p-phenylene ester; Isonate 125 MF; Isonate 125M; Methylene bisphenyl isocyanate; Methylene di-p-phenylene isocyanate; Methylenebis(4-isocyanatobenzene); Methylenebis(4-phenyl isocyanate); Methylenebis(4-phenylene isocyanate); Methylenebis(p-phenyl isocyanate); Methylenebis(p-phenylene isocyanate); Methylenebis(para-phenyl isocyanate); Methylenebis(para-phenylene isocyanate); Methylenedi-p-phenylene diisocyanate; Methylenedi-para-phenylene diisocyanate; p,p'-Diphenylmethane diisocyanate; p,p'-Methylenebis(phenyl isocyanate); para,para'-Diphenylmethane diisocyanate; para,para'-Methylenebis(phenyl isocyanate); 1,1'-Methylenebis(4-isocyanatobenzene); 4,4'-Methylenediphenyl diisocyanate; 4,4'-Methylenediphenylene diisocyanate; Benzene, 1,1'-methylenebis(4-isocyanato-  Isocyanic acid, methylenedi-p-phenylene ester; 1,1'-Methylenebis(4-isocyanatobenzene); 4,4'-Diphenylmethane diisocyanate; 4,4'-Methylenediphenyl diisocyanate; Benzene, 1,1'-methylenebis(4-isocyanato-; Diphenylmethane diisocyanate; Diphenylmethane-4,4'-diisocyanate; Isocyanic acid, methylenedi-p-phenylene ester; Methylene bisphenyl isocyanate; Methylene diphenyl diisocyanate; Methylenebis(phenylisocyanate
OTHER CAS RN

53633-14-0; 55157-41-0; 57460-66-9; 77090-48-3; 88001-94-9; 97568-33-7; 142690-07-1;153986-89-1; 201528-77-0;

DERIVATION

 

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE white to light yellow crystals
MELTING POINT 40 C
BOILING POINT

314 C

SPECIFIC GRAVITY 1.23
SOLUBILITY IN WATER Reacts
pH

 

VAPOR DENSITY  

AUTOIGNITION

 

REFRACTIVE INDEX

 

NFPA RATINGS

 
FLASH POINT

212

STABILITY  

APPLICATIONS

Diisocyanates (or polyisocyanates) are monomers for polyurethane production. Polyurethane is made from a variety of diisocyanates in conjunction with polyether and polyester polyols as co-reactants by addition polymerization which needs at least two -N=C=O groups. Polyurethanes are widely used in the manufacture of flexible and rigid foams, fibres, coatings, and elastomers. The most common diisocyantes for this reaction are:

DIISOCYNATES

CAS #

EINECS #

N=C=O

FORMULA
4,4'-METHYLENEDIPHENYL DIISOCYANATE (MDI) 101-68-8 202-966-0

33.6%

CH2(C6H4NCO)2 (250.25)

P-PHENYLENE DIISOCYANATE (PPDI)

104-49-4 203-207-6

52.5%

C6H4(NCO)2 (160.13)

1.6-HEXAMETHYLENE DIISOCYANATE (HDI)

822-06-0 212-485-8

49.9%

(CH2)6(NCO)2  (168.19)

1,5-NAPHTHALENE DIISOCYANATE (NDI)

3173-72-6 221-641-4

39.9%

C10H6(NCO)2 (210.19)

ISOPORON DIISOCYANATE (IPDI)

4098-71-9 223-861-6

37.8%

(CH3)2C6H7(CH3)CH2(NCO)2 (222.29)

TOLUENE DIISOCYANATE (TDI)

26471-62-5 247-722-4

48.3%

CH3C6H3(NCO)2 (174.16)
 

An aromatic diisocyanate Methylene diphenyl diisocyanate ( MDI) is the most consumed diisocyanate used as a major raw material used in the production of rigid polyurethane foam and polyurethane elastomers and strength adhesive. Typically, one tonne of polyurethane foam needs 0.616 tonne of MDI and balance tonne of polyols (such as polyester and polyether), with small amount blowing agent. MDI exists in three isomers, 2,2'-, 2,4'-, and 4,4'-MDI. The 4,4' isomer, a symmetrical molecule having equal reactivity of two groups, is practically useful. End application include foam insulation, refrigeration, coatings, adhesives, sealants and elastomers..

SALES SPECIFICATION

APPEARANCE

 
PURITY

 

N=C=O CONTENT

 

COLOR, APHA

 

NCO EQUVALENT WT.

 

TRANSPORTATION
PACKING  
HAZARD CLASS  
UN NO. 2489
OTHER INFORMATION
Hazard Symbols: XN, Risk Phrases: 20-36/37/38-42/43, Safety Phrases: (2-)-23-36/37-45

GENERAL DESCRIPTION OF CYANATE (ISOCYANATE)

Cyanic acid (the isomer of fulminic acid) is an unstable (explosive), poisonous, volatile, clear liquid with the structure of H-O-CN (the oxoacid formed from the pseudohalogen cyanide), which is readily converted to cyamelide and fulminic acid. There is another isomeric cyanic acid with the structure of H-N=C=O, called isocyanic acid. Cyanate group (and isocyanate group) can react with itself. Cyanuric acid (also called pyrolithic acid), white monoclinic crystal with the structure of [HOC(NCOH)2N], is the trimer of cyanic acid. The trimer of isocyanic acid is called biuret.
  • Cyanic acid: H-N=C=O or H-O-CN
  • Fulminic acid: (H-C=N-O) or H-CN-O
  • Isocyanic acid: H-N=C=O
  • Cyanuric acid: HOC(NCOH)2N
  • Biuret: (NH2)CO)2 NH

Cyanic acid hydrolyses to ammonia and carbon dioxide in water. The salts and esters of cyanic acid are cyanates. But esters of normal cyanic acid are not known. The salts and esters of isocyanic acid are isocyanates. The isocyanate group reacts with the hydroxyl functional group to form a urethane linkage. Diisocyanates (or polyisocyanates) are monomers for polyurethane production. Polyurethane is made from a variety of diisocyanates in conjunction with polyether and polyester polyols as co-reactants by addition polymerization which needs at least two -N=C=O groups. Polyurethanes are widely used in the manufacture of flexible and rigid foams, fibres, coatings, and elastomers. If isocyanate monomer is polymerized with amine group, polyurea is produced. Cyanates (or Isocyanates) are readily reacts with various form of amine (including ammonia, primary-, secondary-amines, amides and ureas) and hydroxyl functional group. They are used in the synthesis for the target molecules such as pharmaceuticals, pesticides, textile softener, lubricants and industrial disinfectants. They can convert to polycyclic compounds such as hydantoins and imidazolons. They are used as plastic additives and as heat treatment salt formulations for metals.