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| CAS No.: | 139-25-3 |
|---|---|
| Name: | 4,4'-DIISOCYANATO-3,3'-DIMETHYLDIPHENYLMETHANE |
| Molecular Structure: | |
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| Formula: | C17H14 N2 O2 |
| Molecular Weight: | 278.31 |
| Synonyms: | Isocyanicacid, methylenebis(2-methyl-p-phenylene) ester (7CI,8CI);3,3'-Dimethyldiphenylmethane 4,4'-diisocyanate;4,4'-Diisocyanato-3,3'-dimethyldiphenylmethane;4,4'-Diphenyl-3,3'-dimethylmethane diisocyanate; NSC 84203; Nacconate 310 |
| Density: | 1.1 g/cm3 |
| Boiling Point: | 410.4 °C at 760 mmHg |
| Flash Point: | 169.5 °C |
| Safety: | Poison by intravenous route. A sensitizer. When heated to decomposition it emits toxic fumes of NOx and CN−. |
| PSA: | 58.86000 |
| LogP: | 3.82880 |
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Chemistry
IUPAC Name:1-Isocyanato-4-[(4-isocyanato-3-methylphenyl)methyl]-2-methylbenzene
Synonyms: 3,3'-Dimethyldiphenylmethane 4,4'-diisocyanate ; 3,3'-Dimethyldiphenylmethane-4,4'-diisocyanate ; 3,3'-Dimethyldiphenylmethane-4,4'-diisocyanate [Diisocyanates] ; 4, 4'-Diisocyanato-3,3'-dimethyldiphenylmethane ; 4,4'-Diisocyanato-3,3'-dimethyldiphenylmethane ; 5, 5'-Methylenebis (2-isocyanatotoluene) ; 5, 5'-Methylenebis (2-isocyanatotoluene)
Product Categories: Diphenylmethanes (for High-Performance Polymer Research);Functional Materials;Reagent for High-Performance Polymer Research
CAS NO: 139-25-3
Molecular Formula of 4, 4'-Diisocyanato-3,3'-dimethyldiphenylmethane (CAS NO. 139-25-3) : C17H14N2O2
Molecular Weight of 4, 4'-Diisocyanato-3,3'-dimethyldiphenylmethane (CAS NO. 139-25-3): 278.31
Molecular Structure of 4, 4'-Diisocyanato-3,3'-dimethyldiphenylmethane (CAS NO. 139-25-3) : 
Mol File: 139-25-3.mol
Index of Refraction: 1.576
Surface Tension: 41.1 dyne/cm
Density: 1.1 g/cm3
Flash Point: 169.5 °C
Enthalpy of Vaporization: 66.27 kJ/mol
Boiling Point: 410.4 °C at 760 mmHg
Vapour Pressure: 6.04E-07 mmHg at 25°C
Toxicity Data With Reference
| 1. | ivn-mus LD50:320 mg/kg | CSLNX* U.S. Army Armament Research & Development Command, Chemical Systems Laboratory, NIOSH Exchange Chemicals. (Aberdeen Proving Ground, MD 21010) NX#00946 . |
Consensus Reports
Reported in EPA TSCA Inventory.
Safety Profile
RTECS NQ8820000
Standards and Recommendations
NIOSH REL: (Diisocyanates) TWA 0.005 ppm; CL 0.02 ppm/10M
Specification
Reactivity Profile: Isocyanates and thioisocyanates, such as 4, 4'-Diisocyanato-3,3'-dimethyldiphenylmethane (CAS NO. 139-25-3) , are incompatible with many classes of compounds, reacting exothermically to release toxic gases. Reactions with amines, aldehydes, alcohols, alkali metals, ketones, mercaptans, strong oxidizers, hydrides, phenols, and peroxides can cause vigorous releases of heat. Acids and bases initiate polymerization reactions in these materials. Some isocyanates react with water to form amines and liberate carbon dioxide. Base-catalysed reactions of isocyanates with alcohols should be carried out in inert solvents. Such reactions in the absence of solvents often occur with explosive violence.