Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 931-288-4 | CAS number: -
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
The calculated atmospheric oxidation rate constant of 1,3-Diazetidine-2,4-dione, 1,3-bis(6-isocyanatohexyl), the main constituent of HDI Uretdion (n = 2) is 25.0 * E-12cm3/(molecule *sec) and its atmospheric half-life is 15.4 hrs at 25 °C. The value is a result of a QSAR estimation (Currenta, 2014 c).
The atmospheric oxidation rate constant of the corresponding diamine of the main constituent of HDI Uretdion (n=2) is 86.1 * E-12cm3/(molecule *s) and its atmospheric half-life is 4.5 hrs at 25 °C (Currenta, 2014 d).
Key value for chemical safety assessment
- Half-life in air:
- 15.4 h
Additional information
The substance hydrolyses rapidly with a half-life of far less than 24 hours, approx. 6.1 hours. Therefore, an experimental study with HDI Uretdion is scientifically unjustified. The hydrolysis product is a complex mixture of water-insoluble oligomeric and polymeric ureas and of 1,3-Diazetidine-2,4-dione, 1,3-bis(6-isocyanatohexyl), the main constituent of HDI Uretdion, where the isocyanate groups have been transformed to amino groups.
Although being a more theoretical approach, an ideal structure the "corresponding diamine of HDI Uretdion (n=2) was considered in order to get an estimation on the behaviour of the hydrolysed product in air. For both, the unreacted HDI Uretdion (n=2) as well as for the corresponding diamine of HDI Uretdion (n=2), calculated values with two estimation methods are presented.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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
