Irgafos Tris phosphite

Applications Extraction is typically accomplished by refluxing the polymer in an appropriate solvent for l-48h [84,199]. In many cases, ultrasonic exposure reduces the extraction time [90,200], According to Table 3.5 there are several reports of US extraction from polymers. Ultrasonic extraction has been used for HDPE/(BHT, Irganox antioxidants, Isonox, Cyasorb, Am 340, MD 1024, Irgafos 168) [56], LDPE/Chimassorb 81 [201], SBR/tri(nonylphenyl) phosphite [200], HDPE/(Tinuvin 770, Chimassorb 944) [114], etc. Nielson [90] compared the recoveries obtained for a variety of analytes from PP, LDPE and HDPE with Soxhlet, ultrasonic bath and microwave oven. For all samples, the ultrasonic extraction could be achieved within 1 h. For LDPE and PP most compounds (except Irganox 1010) were extracted within 10 min. Further experiments by Nielson [56] on extraction from HDPE confirmed these results. Where phosphite antioxidants (such as Irgafos 168) are present the use of the solvent mixture DCM-cyclohexane was preferred as it prevented hydrolysis of the phosphite by extraction solvents such as alcohols [56]. Similarly, phosphite esters also undergo hydrolysis... 

Pentaerythrityl tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (Irganox 1010) and tris(2,4-di-tert-butylphenyl)phosphite (Irgafos 168), additives 9 and 12 in Table 25. 

Secondary (hydroperoxide decomposer) Irgafos 168 Tris(2,4-di-terf-butylphenyl)phosphite... 

Weston 626 (2,4-di-5-butylphenyl) pentaerythritol diphosphite Ciba Irgafos 168 tris-(2,4-di-r-butylphenyl) phosphite. 

Irgacure 907. See 2-Methyl-1 -[4-(methylthio) phenyl]-2-morpholinopropan-1-one /rgacwre 2959. See 2-Hydroxy-[4 -(2-hydroxyethoxy) phenyl]-2-methyl propanone Irgafos 12. See 2,2, 2"-Nitrilo [triethyl-tris (3,3, 5,5 -tetra-t-butyl-1,1 -biphenyl-2,2 -diyl) phosphite]... 

Irgafos OPH. See Dioctyl phosphite Irgafos TNPP. See Tris (nonylphenyl) phosphite... 

In an article in 1998 examining new trends in stabilising additives. Solera [55] noted that, while phosphites are effective process stabilisers in PET, they can themselves be subject to hydrolytic degradation. A new phosphorus-based stabiliser with increased hydrolytic stability was suggested in the form of 2,2, 2 -nitrilo[triethyl-tris(3,3, 5,5 -tetra- -butyl-l,T-biphenyl-2,2 -diyl)]phosphite (Irgafos 12 Ciba). 

FIGURE 1 The molecular structure of Irgafos 168 [tris (2, 4-di-tert-butylphenyl) phosphite], (Schwetlick 1990)... 

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