Antiblock agents

S. antibioticus Antiblock agent Antiblocking agents Antibodies... 

Additives. Compounds are often added to the polymer at the extmder or melt homogenizer. Common additives are antioxidants (qv), thermal stabilizers, sHp agents, antiblock agents, anduv stabilizers. Popular antioxidants are 2,6-di-/-butyl-/)-cresol (BHT), octadecyl... 

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. 

While pure erucamide does not exhibit absorption in the 250-280 nm range all commercial products showed UV absorption maxima at 230, 257, 267 and 278 nm (with variable intensities), indicative of the presence of oxidation products (up to 8 wt%) as impurities with chromophoric groups. Colourless impurities do not have an interference effect. 1JV/VIS was also used to evaluate discoloration of 50wt/wt% mixtures of commercial erucamide and inorganic antiblock agents [59]. Apart from the interference by impurities from solvents chemical methods suffer from lengthy procedures. 

See Antiblocking agents, Release agents, Slip agents. 

On a related theme, we can take advantage of the diffusion of molecules incorporated into a polymer to its surface. Thus we can blend lubricants, bactericides, and antiblock agents into polymers, which slowly exude to the surface where they perform a useful role. 

Ecoflex Batch SL 1 Ecoflex Batch SL 2 Ecoflex Batch AB 1 Ecoflex Batch AB 3 Ecoflex Batch C White Ecoflex Batch C Black Lubricant Lubricant Antiblocking agent Antiblocking agent White batch Black batch 10% Erucamide ESA 5% Wax, additive 60% Eine chalk 40% Very fine chalk 60% Ti02 25% Carbon black... 

Antiblock agents like talc, chalk or silica can be used in form of masterbatches [23, 25]. The antiblock batches for processing Ecoflex and Ecovio are sold by BASF under the name Ecoflex Batch AB 1 or AB 3. 

Example 1 Film extrusion on blown film line. Antiblock agents like masterbatches of talc, chalk or silica (e.g., Ecoflex Batch AB 1) can be used for Ecoflex and Ecovio . The recommended level is higher than for polyolefins, e.g., 1 % of antiblock agent. If Ecovio compounds are processed, an antiblock agent in most cases is not needed for Ecovio F Film and Ecovio E Blend, because PLA acts as antiblock agent in higher quantities. 

There are at least five types of synthetic silicas that can be considered for use in polymers. These are generally known as fumed, arc, fused, gel and precipitated. A detailed review of their production and uses has been given by Watson [96]. The types most often encountered in thermoplastics are the gel and precipitated silicas which are frequently used as antiblocking agents in polymer films and as gloss reducing agents in polymer sheets. 

Modification of surface properties Antistatic agent Slip agent Antiblocking agent Adhesion promoter Corrosion inhibitor Surfactant ... 

Antiblock agent -for LDPE film [OLEFIN POLYTffiRS - POLYETHYLENE - LOW DENSITY POLYETHYLENE] (Vol 17)... 

Antiblocking agents, slip additives Silica, amide waxes, oleamide... 

The Dylux 503 formulation contained a HABI, the leucodye TLA-454, a mixture of quinones, triethanolamine triacetate, several plasticizers, an organic acid, cellulose acetate butyrate binders, as well as antiblocking agents (fluorinated derivatives) as well as a silica derivative to provide tooth to the coating. The selection was made to provide maximum performance at minimum mill cost. The paper substrate required had high holdout, so as to permit two-sided coatings as well as to minimize the wicking of chemistry into the base. 

Some fine particle fillers, such as silica gel or chalk, called as antiblocking agents, can also be classified as external lubricants. They make the separation of rolled films easier. 

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