Irgafos - Process and heat stabilizers - BASF SE

Kunststoffe international, 2005-11-21, Consumer Protection: Migration Models for the Assessment of Plastic Products
...is relatively low, however. If a comparison is drawn, for example, between the two frequently-used antioxidants 3-octadecyl-(3,5-di-tert-butyl-4-hydroxy-phenyl)propionate (Irganox 1076) and tris(2,4-di-tert-butyl-phenyl)phosphite (Irgafos 168) (Fig. 3) in respect of their diffusion in PE-HD at 70°C, then the AP value obtained for Irgafos 168 is 0.8 units lower than for Irganox 1076, and that means a DP value that is 0.5 times lower. The contribution of the molecule structure thus falls within th...

Kunststoffe international, 2006-03-23, Packaging Recycling: From Bottle to Bottle
...that of virgin PE-HD. However, the washed flakes were found to contain elevated concentrations of two substances: the aroma substance limonene and di-tert.-butylphenol, which is a product of the thermal degradation of the polymer additive Irgafos 168. Both substances are non-critical from toxicological aspects. Nevertheless, their concentrations in the recycled material should be kept to a minimum. For this reason, a further decontamination step was introduced. The flakes were heated in a contin...

Kunststoffe international, 2014-04-14, Surface Analysis: Polymers Under the Chemical Magnifying Glass
...istic and can be used for identification. ToF-SIMS spectra are highly sensitive to changes in molecular structure. As an example, Figure 4 shows the spectra for the oxidation-inhibiting additive tris(2,4-ditert-butylphenyl) phosphite (grade: Irgafos 168; manufacturer: Ciba AG, Basel, Switzerland), both in its starting form and after oxidation. The two forms of the additive can be distinguished analytically. This detection limit of this technique is a few ppb for elements and fmol for molecules. ...