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Physical & Chemical properties

Dissociation constant

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Description of key information

No test is performed for this complex UVCB in view of the very low water solubility. The pKa for the different components was calculated to vary between 4.71 and 4.77. The average value of 4.75 is chosen as representative for the UVCB

Key value for chemical safety assessment

pKa at 20°C:
4.75

Additional information

Calculated values (by QSAR) from the major compounds Rosin (CAS 8050 -09 -7), Rosin, maleated (CAS 8050-28-0), TOFA, maleated (CAS 68139-89-9) and Fatty acids, tall-oil (CAS 61790-12-3) are in range of 4.71 - 4.77. As the pKa is based on a representative structure for each of the UVCB components, it is expected that the branching and length of the C-chain in TOFA influences the outcome of the individual calculations marginally.

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