Polyolefins, applications

Today, large polyolefin extruders are built as ZSK MEGAcompounders, mainly as 320, 350, and 380 Me sizes. The reason for this is clear from Fig. 14.8 which shows the same relationship as Figure 14.7, but specifically for polyolefin applications, here with the ZSK Me limit curve for maximum throughput. Normally, the torque limit is only reached with LLDPE and FfDPE if pressure is also built up by the ZSK and the powder from the polymerization reactor is coarse enough to prevent intake problems. With PP or melt-charged LDPE or two-stage machines for bimodal polyethylene, the torque required is well below the Me limit curve. 

General purpose phenolic antioxidant used for polyolefin applications such as petroleum, animal feed, and for food products and packaging. 

The combination of mutually independent reaction stages in series, combined with a specially developed family of Himont s catalysts, gives rise a highly versatile process. This process is suitable for designing special polymeric structures ready to meet today s existing polyolefinic applications and tomorrow s future developments. 

With one exception, all of the 7% PY13 and PY83 concentrate/LLDPE compounds showed negligible increases in 3,3 -DCB levels after treatment at 240°C. Levels increase sig-nifieantly after treatment at 270°C. Pigment Yellow 83 appeared to be more thermally stable than Pigment 13 at typical loading levels encountered in polyolefin applications. 

GOAD 12 calcium stearate series polyolefin applications, product data sheet (4/05). Norac, Inc. 

Figure 12.5 Range of particle sizes for talc-filled polyolefin applications [3], (With permission from the publisher.)...

Synthetic hydrotalcites employed in plastics applications are finely divided, free-flotving, odorless, amorphous powders. For polyolefin applications, hydrotalcites with an average particle size of 0.5 (tm and a specific surface area ofless than 20 m /g (BETmethod) are recommended. Their density varies around 2.1 g/cm depending on the composition. Sodium, zinc, and calcium stearate-coated hydrotalcites are available, which show enhanced compatibility with polyolefins [13]. Figure 20.3 is a scanning electron micrograph of a typical submicron-size synthetic hydrotalcite [20]. 

Although metallocene-produced polyolefins can compete with commodity polyolefins synthesized with conventional Ziegler-Natta catalysts, they wiU probably not be restricted to the pol)uner commodity market. Because of the better pol3uner microstructure control obtained with metallocene catalysts, it will be possible to produce specialty polyolefins to compete with nonolefinic polymers, thus opening an entire new market for polyolefin applications. 

Both functional polyolefins and polyolefin block/graft copolymers have been shown to dramatically increase in polyolefin adhesion, compatibihty, wettabihty, printability, and ion conductivity through functionalization [71-78]. Traditionally, they are the most difficult areas for polyolefin application and limit polyolefins in high-end applications. I have discussed new applications such as dielectrics for energy storage. 

Hot Runner Solutions for Packaging Parts, Closures, and Miscellaneous Polyolefin Applications... 

Abundant information on the sorption and diffusion of water in various polymers is available. The data acceptable for polyolefins application in medicine are shown in Table 1. 

Some of their characteristics are given in T able 1. The following are producers and tradenames of the blowing agents of present interest in polyolefin applications. 

Pigmented polyolefin applications such as polypropylene indoor/outdoor carpets and synthetic turf. Synergistic combination with ZnO or AM-300. 

Broad-band benzotriazole UV absorber recommended for polyolefin applications. 

FDA-sanctioned polymeric HALS characterized by low volatility and recommended for polyethylene film, polypropylene fiber and molded polyolefin applications. 

Hindered benzoate recommended for halogenated flame retardant polyolefin applications. 

Such improvements are of value in a variety of polyolefin applications, including ... 

Though polyolefins are suitable polymers to use in outdoor durable applications they must be used in concert with weatherfast, heat resistant colorants to maintain color. Dyes are not recommended for use in polyolefin applications because they will be soluble and migrate out of the matrix. 

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