DIMERIC TOLUENE-2,4-DIISOCYANATE

Dimeric toluene-2,4-diisocyanate is primarily used in the production of polyurethane materials.
Dimeric toluene-2,4-diisocyanate is primarily used as a curing agent or crosslinker in polyurethane systems.

CAS Number: 26747-90-0
EC Number: 247-953-0
Molecular Formula: C₁₈H₁₂N₄O₄
Molar Mass: 348.32 g/mol

SYNONYMS:
2,4-TDI Dimer, 2,4-Toluenediisocyanate Dimer, 2,4-Tolylene Diisocyanate Dimer, 2,4-Dioxo-1,3-diazetidine-1,3-bis(methyl-m-phenylene) Diisocyanate, Isocyanic Acid, (2,4-dioxo-1,3-uretidinediyl)bis(methyl-m-phenylene) Ester, THANECURE T9 SUPERFINE, 1,3-bis(3-iso cyanatomethyl phenyl)-1,3-diazetidine-2,4-dione, 1,3-bis(3-iso cyanatomethylphenyl)-1,3-diazetidine-2,4-dione, 1,3- diazetidine-2,4-dione, 1,3-bis(3-isocyanatomethylphenyl)-, 2,4- dioxo-1,3-diazetidine-1,3-bis(methyl-m-phenylene) diisocyanate, 2,4-Toluene diisocyanate dimer, PZP0846SQD, 2,4-Dioxo-1,3-diazetidine-1,3-bis(methyl-m-phenylene) diisocyanate, Toluene diisocyanate dimer, THANECURE T9 SUPERFINE, EINECS 247-953-0, 2,4-TOLUENEDIISOCYANATE DIMER, ISOCYANIC ACID, (2,4-DIOXO-1,3-URETIDINEDIYL)BIS(METHYL-M-PHENYLENE) ESTER, 247-953-0, 1,3-bis(3-isocyanato-4-methylphenyl)-1,3-diazetidine-2,4-dione, 26747-90-0, TDIC, UNII-PZP0846SQD, SCHEMBL1987759, DTXSID20865315, LOCPTSFJZDIICR-UHFFFAOYSA-N, NS00050148, 1.3 Bis (3-isocyanato-4- methylphenyl) -1.3-diazetidin-2.4-dione, 1,3-Bis(3-isocyanatomethylphenyl)urete-2,4-dione, 2,4-TDI dimer, 2,4-Toluenediisocyanate dimer, 2,4-Tolylene diisocyanate cyclic dimer, 2,4-Tolylene diisocyanate dimer, Isocyanic acid, (2,4-dioxo-1,3-uretidinediyl)bis(methyl-m-phenylene) ester, m-Tolylene diisocyanate dimer, 2,4-DIOXO-1,3-DIAZETIDINE-1,3-BIS(METHYL-M-PHENYLENE) DIISOCYANATE, 2,4-TDI DIMER, 2,4-TOLUENE DIISOCYANATE DIMER, 2,4-TOLUENEDIISOCYANATE DIMER, ISOCYANIC ACID, (2,4-DIOXO-1,3-URETIDINEDIYL)BIS(METHYL-M-PHENYLENE) ESTER, THANECURE T9 SUPERFINE

Dimeric Toluene-2,4-diisocyanate is a dimerized form of 2,4-toluene diisocyanate (TDI).
Dimeric Toluene-2,4-diisocyanate is a modified form of the aromatic isocyanate 2,4-toluene diisocyanate (TDI).
Dimeric toluene-2,4-diisocyanate is produced by chemically bonding two TDI molecules through a controlled dimerization reaction.

This process transforms the monomeric TDI into a more stable, less volatile compound with enhanced safety and handling characteristics.
Dimeric toluene-2,4-diisocyanate typically exists as a solid or viscous liquid, depending on formulation and temperature.

Dimeric toluene-2,4-diisocyanate retains reactive isocyanate groups, making it suitable for further chemical reactions with polyols or amines in polyurethane chemistry.

Due to its reduced toxicity and slower reactivity, Dimeric toluene-2,4-diisocyanate is favored in applications requiring safer processing conditions and longer pot life.

USES and APPLICATIONS of DIMERIC TOLUENE-2,4-DIISOCYANATE:
Dimeric toluene-2,4-diisocyanate is primarily used in the production of polyurethane materials.
Dimeric toluene-2,4-diisocyanate is primarily used as a curing agent or crosslinker in polyurethane systems.

In the polyurethane industry, Dimeric toluene-2,4-diisocyanate helps manufacture elastomers, foams, and thermosetting resins with enhanced mechanical properties.
Dimeric toluene-2,4-diisocyanate is used in high-performance adhesives and sealants, where strong bonding, flexibility, and chemical resistance are essential.

In industrial coatings, Dimeric toluene-2,4-diisocyanate enhances weather resistance, abrasion durability, and chemical stability of surface finishes.
Dimeric toluene-2,4-diisocyanate is also utilized in RIM (reaction injection molding) and SPUA (spray polyurea applications), where controlled reactivity and reduced emissions are important.

Because of its low volatility, Dimeric toluene-2,4-diisocyanate is preferred in environments where exposure to hazardous fumes must be minimized.
Its improved handling safety over monomeric TDI makes Dimeric toluene-2,4-diisocyanate suitable for use in confined or poorly ventilated production areas.

APPLICATIONS AND BENEFITS OF DIMERIC TOLUENE-2,4-DIISOCYANATE:
Dimeric Toluene-2,4-diisocyanate is utilized in various industrial applications:

*Polyurethane Production:
Dimeric toluene-2,4-diisocyanate serves as a curing agent or crosslinker in the manufacture of polyurethane elastomers, foams, and coatings.

*Adhesives and Sealants: 
Dimeric toluene-2,4-diisocyanate is used in formulations requiring enhanced mechanical properties and chemical resistance.

*Coatings:
Dimeric toluene-2,4-diisocyanate provides improved durability and resistance to environmental factors in protective coatings.

The dimerized form offers benefits such as reduced volatility and lower toxicity compared to monomeric TDI.
This makes Dimeric toluene-2,4-diisocyanate safer to handle in industrial settings.

KEY BENEFITS OF DIMERIC TOLUENE-2,4-DIISOCYANATE:
*Reduced Volatility
Unlike Dimeric toluene-2,4-diisocyanate, the dimeric form is a solid at room temperature.
Dimeric toluene-2,4-diisocyanate exhibits very low vapor pressure, which significantly reduces the risk of inhalation exposure, making it safer for workers.

Lower Toxicity Profile
Dimerization of Dimeric toluene-2,4-diisocyanate leads to lower reactivity toward biological tissues, decreasing its immediate toxicity.
Dimeric toluene-2,4-diisocyanate is often preferred where occupational safety regulations are stringent.

*Improved Handling and Storage
Being a stable, non-volatile powder, it’s easier to transport, store, and dose than liquid Dimeric toluene-2,4-diisocyanate.
Dimeric toluene-2,4-diisocyanate is less likely to require pressurized containers or specialized ventilation.

*Selective Reactivity
Dimeric toluene-2,4-diisocyanate contains isocyanate functional groups that are available for curing reactions, but its reactivity is more controlled, allowing better process control during polyurethane formation.

*Enhanced Environmental Stability
Dimeric toluene-2,4-diisocyanate is less moisture-sensitive than monomeric TDI, helping to reduce unwanted reactions during processing and extending shelf-life.

*Suitable for High-Performance Applications
Offers better mechanical strength and thermal stability in the final polymer.
Ideal for applications in elastomers, adhesives, coatings, and high-end sealants.

Overview
Dimeric Toluene-2,4-diisocyanate (commonly referred to as TDI Dimer) is a dimerized form of the widely used monomer 2,4-TDI (Toluene-2,4-diisocyanate), an essential building block in the production of polyurethanes.
In its dimeric form, Dimeric toluene-2,4-diisocyanate undergoes a chemical transformation where two TDI molecules combine, typically through a uretdione or biuret linkage, resulting in a more stable, solid compound.

While monomeric TDI is highly effective in creating flexible foams, coatings, elastomers, and adhesives, it is also volatile and hazardous, posing inhalation and sensitization risks during manufacturing.

Dimeric toluene-2,4-diisocyanate is specifically designed to overcome these health and safety concerns, offering a safer, more controlled alternative with retained isocyanate functionality.

Because it maintains reactive isocyanate groups, the Dimeric toluene-2,4-diisocyanate can still participate in essential polyaddition reactions, making it suitable for a wide range of industrial polyurethane applications, especially where worker safety and environmental compliance are top priorities.

PHYSICAL and CHEMICAL PROPERTIES of DIMERIC TOLUENE-2,4-DIISOCYANATE:
IUPAC Name: 1,3-Diazetidine-2,4-dione, 1,3-bis(3-isocyanatomethylphenyl)-
Molecular Formula: C₁₈H₁₂N₄O₄
Molar Mass: 348.32 g/mol
CAS Number: 26747-90-0
EC Number: 247-953-0
PubChem CID: 93102
Appearance: Fine, white powder
Odor: Slight aromatic odor
Melting Point: Not readily available; however, as a solid, 
it has a higher melting point compared to monomeric TDI

Boiling Point: Decomposes before boiling
Density: Approximately 1.2 g/cm³
Solubility: Reacts with water; soluble in organic solvents like acetone and toluene
Stability: Stable under recommended storage conditions; decomposes upon heating
XlogP3-AA: 5.00 (est)
Molecular Weight: 348.31844000
Formula: C18 H12 N4 O4
Assay: 95.00 to 100.00
Food Chemicals Codex Listed: No
Soluble in: water, 0.08745 mg/L @ 25 °C (est)

Molecular Weight: 348.3 g/mol
XLogP3-AA: 5
Hydrogen Bond Donor Count: 0
Hydrogen Bond Acceptor Count: 6
Rotatable Bond Count: 4
Exact Mass: 348.08585488 Da
Monoisotopic Mass: 348.08585488 Da
Topological Polar Surface Area: 99.5 Ų
Heavy Atom Count: 26
Formal Charge: 0

Complexity: 609
Isotope Atom Count: 0
Defined Atom Stereocenter Count: 0
Undefined Atom Stereocenter Count: 0
Defined Bond Stereocenter Count: 0
Undefined Bond Stereocenter Count: 0
Covalently-Bonded Unit Count: 1
Compound Is Canonicalized: Yes
Number: 26747-90-0
Unique Ingredient Identifier: PZP0846SQD
Molecular formula: C18H12N4O4
International Chemical Identifier (InChI): LOCPTSFJZDIICR-UHFFFAOYSA-N
SMILES: C(=Nc1cc(N2C(N(C2=O)c3cc(N=C=O)c(cc3)C)=O)ccc1C)=O

FIRST AID MEASURES of DIMERIC TOLUENE-2,4-DIISOCYANATE:
-Description of first-aid measures
*General advice:
Show this material safety data sheet to the doctor in attendance.
*If inhaled:
After inhalation: 
Fresh air.
*In case of skin contact: 
Take off immediately all contaminated clothing. 
Rinse skin with
water/ shower.
*In case of eye contact:
After eye contact: 
Rinse out with plenty of water. 
Call in ophthalmologist. 
Remove contact lenses.
*If swallowed:
After swallowing: 
Immediately make victim drink water (two glasses at most). 
Consult a physician.
-Indication of any immediate medical attention and special treatment needed.
No data available

ACCIDENTAL RELEASE MEASURES of DIMERIC TOLUENE-2,4-DIISOCYANATE:
-Environmental precautions:
Do not let product enter drains.
-Methods and materials for containment and cleaning up:
Cover drains. 
Collect, bind, and pump off spills. 
Observe possible material restrictions. 
Take up dry. 
Dispose of properly. 
Clean up affected area.

FIRE FIGHTING MEASURES of DIMERIC TOLUENE-2,4-DIISOCYANATE:
-Extinguishing media:
*Suitable extinguishing media:
Carbon dioxide (CO2) 
Foam 
Dry powder
*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.

EXPOSURE CONTROLS/PERSONAL PROTECTION of DIMERIC TOLUENE-2,4-DIISOCYANATE:
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection. 
Safety glasses
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter A 
-Control of environmental exposure:
Do not let product enter drains.

HANDLING and STORAGE of DIMERIC TOLUENE-2,4-DIISOCYANATE:
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed. 
Dry.

STABILITY and REACTIVITY of DIMERIC TOLUENE-2,4-DIISOCYANATE:
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature) .
-Possibility of hazardous reactions:
No data available