Polyolefin materials

The cover of claim 1 wherein said polyolefin material has a tensile strength ranging from about 300 psi to 15,000 psi. 

The cover of claim 1 wherein said polyolefin material comprises polypropylene. 

Polypropylene block and graft copolymers are efficient blend compatibilizers. These materials allow the formation of alloys, for example, isotactic polypropylene with styrene-acrylonitrile polymer or polyamides, by enhancing the dispersion of incompatible polymers and improving their interfacial adhesion. Polyolefinic materials of such types afford property synergisms such as improved stiffness combined with greater toughness. 

Progress in Olefin Polymerization Catalysts and Polyolefin Materials... 

Karlsson, S. Recycled Polyolefins. Material Properties and Means for Quality Determination. Vol. 169, pp. 201-229. 

Volume 161 Progress in Olefin Polymerization Catalysts and Polyolefin Materials Proceedings of the First Asian Polyolefin Workshop, Nara, Japan, December 7-9, 2005... 

In this contribution, we describe the discovery and application of phenoxy-imine ligated early transition metal complexes (FI catalysts) for olefin polymerization, including the concept behind our catalyst design, the discovery and the polymerization behavior of FI catalysts, and their applications to new polyolefinic materials. 

Transition metal catalysis plays a key role in the polyolefin industry. The discovery by Ziegler and Natta of the coordination polymerization of ethylene, propylene, and other non-polar a-olefins using titanium-based catalysts, revolutionized the industry. These catalysts, along with titanium- and zirconium-based metallocene systems and aluminum cocatalysts, are still the workhorse in the manufacture of commodity polyolefin materials such as polyethylene and polypropylene [3-6],... 

The aqueous batteries use water based electrolytes (e.g., KOH electrolyte for NiCd and NiMH and H2-SO4 electrolyte for lead acid), which are less resistive then nonaqueous electrolytes. Polyolefin materials are generally suitable for use in the manufacture of separators for these batteries, but they are not inherently wettable by aqueous electrolytes. Such electrolytes are therefore unable to penetrate the pores of a separator formed from such a material, so that ion migration through the pores in solution will not occur without modification. This problem is sometimes overcome by treating the polyolefin material with a surfactant, which allows an aqueous electrolyte to wet the material. However, such surfactant can be removed from the surfaces of the polyolefin material when electrolyte is lost from the device, for example during charging and discharging cycles, and it is not subsequently replaced on the material when the electrolyte is replenished. 

This problem has also been more durably addressed by modifying the surface properties of the polyolefin materials used to form polymeric sheets, by graft-copolymerizing to those surfaces a monomeric substance which, after copolymerization, confers hydrophilic properties and, in some cases, ion exchange properties. This technique has been found to be practical when the porous substrate is formed from PE, which has been found to lend itself well to a graft-copolymerization reaction of this kind. However, it has been found that when such a reaction is... 

Jenke D, Poss M, Story J, Odufu A, Zietlow D, Tsilipetros T. Development and validation of chromatographic methods for the identification and quantitation of organic compounds leached from a laminated polyolefin material. J Chromatogr Sci 2004(Aug) 42(7) 388-395. 

S. Kobayashi, T. Mizoe, and Y. Iwanami, Process for continuous production of polyolefin material, US Patent 5 200129, assigned to Nippon Oil Co., Ltd. (Tokyo, JP), April 6,1993. 

Recycled Polyolefins. Material Properties and Means for Quality Determination... 

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