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Physical & Chemical properties

Partition coefficient

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Description of key information

The partition coefficient (log Kow) of m-Trifluormethylphenylisocyanat is 3.56 (estimatet by Currenta, 2012).
The partition coefficient (log Kow) of the corresponding hydrolysis product m-Trifluormethylanilin is 2.04 (estimatet by Currenta, 2012).

Key value for chemical safety assessment

Log Kow (Log Pow):
2.04

Additional information

Due to hydrolysis the calculated logKow of 3.56 is from theoretical interest only. For the assessment of m-Trifluormethylphenylisocyanat the calculated logKow of 2.04 for m-Trifluormethylanilin, the hydrolysis product should be taken into account.

Isocyanates are known to rapidly hydrolyse under the formation of the corresponding amine as well as solid polyurea compounds *. However, the insoluble inert polyurea is not assumed to cause environmental hazards due to the reduced uptake of high molecular mass compounds, whereas the amine is assumed to be the ecotoxicological relevant species. Concluding, tests performed using the corresponding amine can equally be used to assess the ecotoxicological hazards of isocyanates assuming the complete transfer of the isocyanate into the corresponding amine while neglecting the formation of a certain fraction ecotoxicological not active polyurea compounds. An underestimation of environmental hazards is thus avoided supporting a conservative and thus protective hazard assessment.

* Bayer Industry Services (2004). 4-chlorophenyl-isocyanate: Investigation on Stability in Aqueous Test Solutions. Project No: 200300181. Leverkusen, Germany. Bayer Industry Services (2003). Isopropylisocyante: Investigation on Stability in Aqueous Test Solutions. Project No: 200300095. Leverkusen, Germany.