Pentaerythritol tetrastearate

If simple sample pretreatment procedures are insufficient to simplify the complex matrix often observed in process mixtures, multidimensional chromatography may be required. Manual fraction collection from one separation mode and re-injection into a second mode are impractical, so automatic collection and reinjection techniques are preferred. For example, a programmed temperature vaporizer has been used to transfer fractions of sterols such as cholesterol and stigmasterol from a reversed phase HPLC system to a gas chromatographic system.11 Interfacing gel permeation HPLC and supercritical fluid chromatography is useful for nonvolatile or thermally unstable analytes and was demonstrated to be extremely useful for separation of compounds such as pentaerythritol tetrastearate and a C36 hydrocarbon standard.12... 

Number-average molar masses were determined using a vapor pressure osmometer (VPO) (Hitachi 117 Molecular Weight Apparatus) at 54.8 0.1°C in toluene (Fisher Scientific, certified A.C.S.) which was distilled from freshly crushed CaH2. The VPO apparatus was calibrated with pentaerythritol tetrastearate (Pressure Chemical). Gel permeation chromatographic (GPC) analyses were performed in tetrahydrofuran by HPLC (Perkin-Elmer 601 HPLC) using six y-Styragel columns (106, 105, 10l, 103, 500, and 100 A) after calibration with standard polystyrene samples. 

For optical applications requiring extreme clarity it is desirable to minimize silver streaking, and yellowing. For example, Topas 5013 can be modified pentaerythritol tetrastearate, pentaerythritol distearate, or zinc stearate in order to improve the optical properties (59). These blends are suitable for high precision optical applications. 

Pentastit Swiss expl contg PETN pentaerythritol tetrastearate (PETS)... 

Hexonit (such as RDX 20-50 NG 80-50% or RDX 50, NG 46 collod cotton 4%) Pentastit 93/7 (PETN 93, phlegmatized with 7% pentaerythritol-tetrastearate, with or w/o 20% A1 added) Pentastit 96.5/3.5 (PETN 96.5 PETS 3-5% with or w/o 3.5% A1 added) Pentrimt (mixt of PETN with not less than 20% NG) Pentro or Pentryl (mixts of PETN TNT with or w/o A1 powder) Plastitfa plastic military expl based on PETN and manufd by Schweiz-Sprengstoff-Fabrik AG its compn has not been revealed) Simplonit (Gamist with 10-15%... 

Congress. The L no longer has any significance pentaerythritol tetrastearate(PETS)... 

Gu, W. (1993). Factor analysis of phase transitions and conformational changes in pentaerythritol tetrastearate. Ana/. Chem., 65, 823-7. [125]... 

Variable-temperature vibrational spectroscopy can be a powerful tool for the study of phase transitions and/or desolvation processes. The technique has been combined with factor analysis to deduce the three phase transitions and four conformational changes associated with pentaerythritol tetrastearate [129]. In this particular work, each thermal event was substantiated by analogous DSC studies. The dihydrates prepared from the two polymorphs of carbamazepine were also studied using variable-temperature techniques [130]. 

Pentaerythritol tetrastearate. See Pentaerythrityl tetrastearate Pentaerythritol triacrylate. See Pentaerythrityl triacrylate Pentaerythritol triallyl ether. See Pentaerythrityl triallyl ether... 

Synonyms 2,2-Bis [[(1 -oxooctadecyl) oxy] methyl]-1,3-propanediyl octa-decanoate Pentaerythritol tetrastearate Definition Tetraester of pentaerythritol and stearic acid Empirical CnHmO,... 

ACM compounds are difficult to process and processing aids must be used, e.g., stearic acid, zinc soaps, fatty alcohol residues, octadecylamine, or pentaerythritol tetrastearate. This later processing aid does not affect vulcanization characteristics, whereas the others retard or accelerate vulcanization. 

In addition to the fatty acids and their metal soaps, fatty acid esters and fatty alcohols are used, because they give outstanding processing improvements but without other types of action—for example, cure and activation or breakdown enhancement during the mastication of NR or IR. Pentaerythritol tetrastearate is a example of an ester-type process aid with a broad range of applications. It does not bloom or exert unwanted effects. 

Pentaerythritol Tetrastearate Form Flake/Bead Melting Range, C 59-63... 

Pentaerythritol tetrastearate. The toxicological properties of this material have not been fully investigated. The substance is not registered with any testing agency and no animal studies were reported. 

Adhesives butyl stearate, cetyl alcohol, emcamide, fatty acid salts of Al, Ca, K, Na and Zn, montan wax, oleamide, palmitamide, pentaerythritol tetrastearate, petroleum waxes, polyethylene oxidized, sorbitan monooleate, stearamide, stearic acid... 

Ester lubricants ate based frequently on pentaerythritol. The mixed mono- and distearate ester blend is particularly useful in wire and cable compounds for improving output and providing a smooth surface without bloom. It is often used in combination with low-MW PE wax in high-speed extmsions. Some use has also been made in rigid PVC profile extmsions, for similar reasons. The latter application has also seen use of pentaerythritol tetrastearate, a lubricant of somewhat lower cost than the mono/diblend. The tetrastearate is, however, more external in rigid PVC and thus more prone to bloom or deposit. 

Chem. Descrip. Pentaerythritol tetrastearate Ionic Nature Nonionic... 

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