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Adsorption / desorption

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Description of key information

logKoc = 4.3 (worst case assumption based on component Rosin)

Key value for chemical safety assessment

Koc at 20 °C:
19 952

Additional information

The complexity of the test substance and its components hampers the calculation of an accurate value for the logKoc. Therefore, calculations of the logKoc have been performed with representative structures of the components compounds Rosin, Rosin, maleated (CAS 8050-28-0), Fatty acids, tall oil (TOFA; CAS 6170-12-3) and TOFA, maleated (CAS 68139-89-9). Although the model used (MCI, part of KOCWIN) is not based on the logKow, the range of values as calculated is rather wide. The resulting LogKoc values are 4.3 for rosin, 2.8 for rosin maleated, 4.1 for TOFA and 2.5 for TOFA maleated, respectively.

As a consequence, the logKoc for the substance Reaction products of tall oil fatty acids and tall oil rosin with maleic anhydride is chosen to be 4.3 in a worst case approach.

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