Name: 4,4'-DIISOCYANATO-3,3'-DIMETHYLDIPHENYLMETHANE
SKU: 139-25-3

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Basic Information

Molecular Structure:
CAS No.:	139-25-3
Name:	4,4'-DIISOCYANATO-3,3'-DIMETHYLDIPHENYLMETHANE

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 NO_x 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

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.