Polyethylene metallocene

Processes for Making Linear Low-density Polyethylene and Metallocene Polyethylene... 

It is generally claimed that metallocene polyethylenes (often abbreviated to m-PE) exhibit superior mechanical and optical properties as well as better organoleptic properties (resulting from the lower residue levels). As an example m-LLDPE is particularly favoured as a stretch film for wrapping because of the good prestretchability, high puncture resistance and tear strength, all of which are claimed to be better than with conventional LLDPE. 

Brookfield, Ct., SPE, 2002, Paper 192, Session M38-Rotational Molding Materials, pp.5, CD-ROM, 012 INVESTIGATION OF THE PROCESSING CHARACTERISTICS AND MECHANICAL PROPERTIES OF METALLOCENE POLYETHYLENE FOAMS FOR ROTATIONAL MOULDING... 

A textured metallocene polyethylene foam sheet suitable for use in a floor covering is made using a highly coactivated azodicarbonamide package which blows the metallocene polyethylene effectively. The preferred coactivators are zinc oxide and urea. The textured surface of metallocene polyethylene foam is formed by a chemical embossing process which utilises a liquid triazole having an alkyl moiety as a foam-expansion inhibitor. The triazole is dissolved in a non-polar solvent to form the foam inhibitor. The preferred inhibitor is a hydrocarbon which may be halogenated. 

Metallocene Polyethylene Polypropylene Polyvinyl chloride Other vinyl polymers... 

Chen X, Yasuda K, Sato Y et al (2004) Measurement and correlation of phase equilibria of ethylene + n-hexane + metallocene polyethylene at temperatures between 373 and 473 K and at pressures up to 20 MPa. Fluid Phase Equilib 215(1) 105-115... 

Guo, G. Wang, K.H. Park, C.B. et al. Effects of nanoparticles on the density reduction and cell morphology of extruded metallocene polyethylene/wood fiber nanocomposites. J. Appl. Polym. Sci. 2007, 104, 1058-1063. 

Linear Low-Density Polyethylene (LLDPE). Ziegler and metallocene polyethylene can be modified by copolymerization with several percent (e.g., 10%) of butene, hexene, or octene, to reduce regularity/crystallinity and modulus, and thus produce... 

Wood-Adams, P.M. Dealy, J.M. Using rheological data to determine the branching level in metallocene polyethylenes. Macromolecules 2000, 33 (20), 7481-7488. 

The thermal activity of a series of nano- and micron-particle grade anatase and rutile titanium dioxide pigments, with various densities of surface treatments, particle size, and surface area, have been determined by chemiluminescence in monomodal metallocene polyethylene [57]. 

TABLE 3.3 Chemiluminescence Under Nitrogen at 170°C of Metallocene Polyethylene Films Containing the Nano and Micron Grade Titania Pigments at 0.5% w/w Concentrations with 0.05% w/w Irganox 1010 Antioxidant Together with Control Unpigmented Samples... 

In general, the stabilization effect observed in the presence of titania was enhanced with the content of pigment, and lower values of /cL-max and CL-peak were obtained for metallocene polyethylene with 2% w/w pigment in comparison with 0.5% content. 

FIGURE 3.4 First and second chemiluminescence peak curves versus time of metallocene polyethylene films free, stabilized with Irganox 1010 (0.05% w/w), and pigmented with micron- and nanoparticle titanium dioxide (0.5%), determined at 170°C under oxygen. 

MPE metallocene polyethylene MUP Danish Materials Research Program... 

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