By E. Chiellini, T. Corner, J. V. Crivello, G. Galli, T. Higashimura, A. Ledwith, M. Sawamoto, R. Solaro
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Extra info for Initiators Poly-Reactions Optical Activity
Food Contact Rubbers 2 - Products, Migration and Regulation It complied with all the BfR requirements for Category 3 materials, but not for Categories 1 and 2, where the limits were exceeded for acidic foods, and also Nnitrosomorpholine extraction into all three simulants in the 24 hour and 10 day tests. Diethylamine Morpholine N-nitrosamines N-nitrosodimethylamine N-nitrosodiethylamine 2. Nitrile rubber compound N-nitrosomorpholine N-nitrosodibutylamine The nitrile rubber compound did not meet the extraction requirements of the FDA for use with fatty food.
These findings confirmed the requirement for using high purity carbon blacks in food contact rubbers. c) The toxic monomer, acrylonitrile, was released from the NBR2 compound on heating at 150 °C. Dicyclopentadiene monomer was also released from the EPDM2 sample under similar conditions. It was unclear whether or not these monomers were present as polymerisation residues or were generated by the heating process. Migration testing for these monomers is advisable. d) Migration of detectable quantities of aromatic amines from compounds containing para-phenylene diamine antiozonants has been observed.
3. Effect of ageing and sanitisers/cleaning agents on the potential migrants identified a) Autoclaving samples does not necessarily reduce the amount of available migrating species (see Table 9 where the level of mercaptobenzothiazole from NR2 and EPDM2 increases after autoclaving) and can lead to the production of new migrants. b) Heat ageing at high temperatures, when it results in surface hardening, has reduced the level of migrating species. However new potential migrants can be formed (see Figure 7).