Tetramethyl Xylene Diisocyanate(TMXDI)

TMXDI is an aliphatic isocyanate because the NCO is not conjugated to the aromatic ring.

- Excellent light stability and exterior durability

• Steric hindrance by dimethyl groups provides lower reactivity and reduces hydrogen bonding

- Lower reactivity with water

- Controlled reactivity by use of catalysts

- No self-condensation「eactions leading to branching, allophanate, biuret, isocyanurate

- Minimal reactivity with carboxyl groups

- Significantly lower prepolymer viscosity

• Equal isocyanate reactivity

• Higher reaction temperatures possible for prepolymer formation

- 100°C-120°C not a problem

- Stable viscosity in absence of water