Isophorone diisocyanate
What is Isophorone diisocyanate?
Isophorone diisocyanate (CAS 4098-71-9), commonly known as IPDI, is an aliphatic cycloaliphatic diisocyanate monomer used to build polyurethane polymers with superior UV and weathering resistance.
Where is Isophorone diisocyanate used?
- Automotive and industrial coatings: two-component polyurethane topcoats and clearcoats that resist yellowing under prolonged UV exposure
- Aerospace and defense: protective coatings on aircraft exteriors and structural components
- Adhesives and sealants: crosslinker for moisture-cure or two-part systems bonding plastics, composites, and metals
- It also serves as a building block for dispersions.
Good to know: Unlike aromatic isocyanates, IPDI-based systems retain color stability over time. Prepolymer and trimer forms are also commercially available for formulators requiring modified reactivity or reduced vapor pressure.
Commercial specifications
- Purity specifications are typically at 99%+ for polymer-grade applications.
- Clear to slightly yellow liquid in standard industrial packaging including drums and IBC containers.
Other Names (Synonyms)
Isophorone diamine diisocyanate|Isocyanic acid, methylene(3,5,5-trimethyl-3,1-cyclohexylene) ester|3-Isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate|IPDI|5-Isocyanato-1-(isocyanatomethyl)-1,3,3-trimethylcyclohexane|Cyclohexane, 5-isocyanato-1-(isocyanatomethyl)-1,3,3-trimethyl-|3,3,5-Trimethyl-5-(isocyanatomethyl)cyclohexyl isocyanate|1-(Isocyanatomethyl)-5-isocyanato-1,3,3-trimethylcyclohexane