Recently, the European Chemicals Agency (ECHA) officially announced the inclusion of diphenyl(2,4,6-trimethyl benzoyl)phosphine oxide (TPO) in the 29th batch of Substances of Very High Concern (SVHC) Candidate List.
For the chemicals on the list, the companies concerned have the responsibility to manage the risk of the chemicals and provide information to customers and consumers on the safe use of these chemicals. If a substance is on this list, its use will be banned, unless the company applies and the European Commission authorizes them to continue using it.
Catalyst is pleased to offer a viable, high performance and environmentally friendly alternate in TMO.
TMO is (2,4,6-trimethyl benzoyl)bis(p-tolyl)phosphine oxide, CAS 270586-78-2. From a structural point of view, TMO is based on TPO with the introduction of a methyl group on each of the two benzene rings, significantly reducing TPO’s biological toxicity.
Initiation Efficiency
It has been found experimentally that TMO has an even slightly better initiation efficiency than TPO while not yellowing and migrating much less.
Double bond conversion curves of TMO and TPO initiated TMPTA
Toxicity Testing:
- Reproductive Toxicity: Independent testing of TMO for reproductive toxicity in parental generation show No Observed Adverse Effect Level (NOAEL).
- Developmental Toxicity: Independent testing of TMO for developmental toxicity in the offspring generation show No Observed Adverse Effect Level (NOAEL).
Production
TMO is now in mass production and has obtained the registration certificate of the European Union’s Regulation on the Registration, Evaluation, Authorisation and Restriction of Chemicals (“REACH”), which allows it to be sold in Europe, the region with the most stringent control of chemicals.
Request for TSCA approval has been submitted to EPA. Samples are available for R&D purposes only.
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