2,4-Toluene diisocyanate dimer

2,4-Toluene diisocyanate dimer (CAS 26747-90-0) is a solid, low-vapor-pressure blocked isocyanate derived from TDI; it releases reactive isocyanate groups upon thermal activation.

Where is 2,4-Toluene diisocyanate dimer used?

• Powder coatings and one-component polyurethane systems: latent crosslinker that activates during cure cycles, enabling stable pre-mixed formulations with extended shelf life
• Rubber and tire compounding: curative improving adhesion between rubber substrates and reinforcing materials, particularly in belt and hose constructions
• Adhesives and sealants: controlled crosslink density in polyurethane systems without handling complications of free TDI
• Thermoplastic polyurethane and elastomer production: reactive monomer contributing to hard-segment formation and mechanical performance
• Unlike monomeric TDI, the dimerized form offers significantly reduced volatility.

Good to know: Unlike monomeric TDI, the dimerized form offers significantly reduced volatility, making it a preferred building block where handling safety and formulation stability are procurement priorities.

Commercial specifications

• Purity specifications typically confirmed by NCO content titration
• Packaging in multi-kilogram bags through to bulk quantities depending on supplier