Registration Dossier
Registration Dossier
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EC number: 457-670-6 | CAS number: 157859-20-6
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
log Kow [ tri(isopropyl)silyl acrylate]: Not relevant due to very rapid hydrolysis in contact with water
log Kow [tris(1-methylethyl)silanol]: 3.9 at 20°C (QSAR)
log Kow [acrylic acid]: 0.46 at 25°C (non-ionised form)
Key value for chemical safety assessment
Additional information
The requirement to conduct an n-octanol/water partition coefficient for the submission substance is waived because in contact with water, the substance hydrolyses very rapidly to form tris(1-methylethyl)silanol and acrylic acid.
An estimated log Kow of 5.2 was obtained for the parent substance based on estimation of the solubility of the substance in octanol and in water.
The silanol hydrolysis product has a predicted log Kow of 3.9 at 20°C using a validated QSAR estimation method.
Acrylic acid has a log Kow value of 0.46 at 25°C (ECB 2002). Log Kow of value of -2.3 for the ionised form of acrylic acid at pH 7 and 25°C was obtained from the log Kow value of the un-ionised form using the standard equation as stated in R7a (ECHA 2008).
References:
ECB (2002). European Union Risk Assessment Report acrylic acid CAS No: 79-10-7 EINECS No: 201-177-9 Risk Assessment, PL-1 Vol 28, 2002.
ECHA (2008) Guidance on information requirements and chemical safety assessment. Chapter R.7a: Endpoint specific guidance.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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