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a. 2,4-TDI monomer.
H3C OCN O
b. Polyisocyanate of TDI.
N C
O C N
CH3 N C
NCO O
NCO H3 C
O
H H 2C O C N O
H3C CH2 C CH2
H O C N O
H H 2C O C N
NCO CH3 NCO CH3 NCO CH3
c. Prepolymer adduct of TDI and trimethylol propane.
Figure 1. Examples of isocyanate structures.
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NIOSH Manual of Analytical Methods
