Antiblocking agents, analysis

Hunt et al. [354] used cSFC for the separation of extracts of poly(alkylene glycol) lubricants and sorbitan ester formulations. Doehl et al. [337] have compared the performance of cSFC-FID and pSFC-FID with both scC02 and scN20 in the analysis of the antiblocking agents oleamide and erucamide, the antistatic Armostat 400 and antioxidant Hostanox SE-10, none of which can be detected by UV absorption. By using open-tubular capillary columns, PAs as well as (un)substituted heavy carboxylic acids (> C ) can be eluted. 

Plastic foils used for wrapping TLC plates were once reported to contain amides of oleic, stearic, or palmitic acid as antiblocking agents which may migrate from the wrapping material [28]. Similarly, Amos [447] has encountered interferences from contaminants in solvents in the TLC analysis of phenolic AOs in turbine oils. 

It is also possible to determine multiadditives in the same sample using FTIR and multivariate analysis methods. For example, the simultaneous determination of the concentrations of silica, erucamide and butylhydroxytoluene in PE were measured using IR spectroscopy and suitable calibration models. The concentrations were between 20 and 1100 wt/ppm (366). A multiadditive method was developed for characterisation of an antiblocking agent (silica) and lubricant (erucamide) in molten low density polyethylene (LDPE) samples (324). 

Fidler [74,92,93] has similarly reported on-line FTIR analysis of silica antiblocking agent, eru-camide and oleamide lubricant levels using a high-temperature (210°C) pressure flow cell (with 750 /xm... 

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