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Polyolefin elastomers metallocene catalyst

Metallocene catalysts are the latest innovations to make a big impact in the polymer industry. They have been used mostly to make new polyolefin plastics, such as very-high-molecular-weight, bullet-proof polyethylene, but they have also been used to make elastomers. The catalysts make very regular stereospecific polymers similar to the Ziegler-Natta catalysts. [Pg.714]

Within the past five years, commercial interest in metallocene catalyst components for the polymerization of olefins has increased enormously. Commercial production of a rising number of polyolefin types from different companies is creating a burgeoning and highly diversified demand for metallocenes. New brand names (e. g., Metocene (Basell), Elite (Dow Chemical), Engage (DuPont), Exact (ExxonMobil), Luflexen (Basell), Apel (Mitsui Chemicals), Borecene (Borealis), Finathene (TotalFinaElf), Topas (Ticona), just to name a few) characterize polyolefins such as PE, elastomers, PP, cycloolefin copolymers (COCs) and PS from metallocene-type catalysts [1-3]. [Pg.265]

Ho, T. Martin, J. M. Structure, Properties and Applications of Polyolefin Elastomers Produced by Constrained Geometry Catalysts. In Metallocene-based Polyolefins Preparation, Properties and Technology, Scheirs, J., Kaminsky, W., Eds. Wiley Chichester, 2000 Vol. 2 175. [Pg.1156]

With metallocene catalysts, not only homopolymers such as polyethylene or polypropylene can be synthesized but also many kinds of copolymers and elastomers, copolymers of cyclic olefins, polyolefin covered metal powders and inorganic fillers, oligomeric optically active hydrocarbons [20-25]. In addition, metallocene complexes represent a new class of catalysts for the cyclopolymerization of 1,5- and 1,6-dienes [26]. The enantio-selective cyclopolymerization of 1,5-hexadiene yields an optically active polymer whose chirality derives from its main chain stereochemistry. [Pg.91]

Thermoplastic elastomers (TPEs) are an extremely fast growing segment of polymer manufacturing. A rate of 5% growth per year is expected until 2007, at which time the total U.S. demand for these materials will reach 1.5 billion lb at a total annual sales of approximately 3 billion dollars per year [1]. The majority of this growth comes in the form of replacements for other types of materials, and the growth of so-called soft-touch surfaces. In the approximately 10 years since the second edition of this book appeared, there has been an important technological advancement in this area the vastly increased production of thermoplastic polyolefin elastomers as a result of the worldwide adoption of metallocene catalysts. [Pg.555]

Lu, H. L., Hong, S., and Chung, T. C. 1998. S5m thesis of new polyolefin elastomers, poly(ethylene-ter-propylene-fer-p-methylestyrene) and poly(ethylene-ter-l-octene-fer-p-methylstyrene), using metallocene catalysts with constrained ligand geometry. Macromolecules 31 2028-2034. [Pg.392]

Until recently, all compounded TPOs were based on PP/EP rubber blends. However, the new metallocene catalyst-based polyolefin elastomers (POEs) are now steadily displacing the EPR and EPDM rubber modifiers in the TPO blends due to the ease of handling and the overall lower cost of POEs. The evolution of the use of POEs in TPO blends will be discussed in the next section. [Pg.1757]

EPM [poly(ethylene-co-propylene)] and EPDM [poly(ethylene-co-propylene-co-5-ethylidene-2-norbomene)P can be metallocene catalyst polymerized. Metallocene catalyst technologies include (1) Insite, a constrained geometry group of catalysts used to produce AfiGnity polyolefin plastomers (POP), Elite PE, Nordel EPDM, and Engage polyolefin elastomers (POP) and (2) Exxpol ionic metallocene catalyst compositions used to produce Exact plastomer octene copolymers.2 Insite technology produces EPDM-based Nordel IP with property consistency and predictability (see Sec. 3.2.2). [Pg.229]

Polyolefins, PO. First impact modification of PO, by addition of elastomers, was patented independently by Bayer A.-G. and Standard Oil Co. in 1937. The isotactic polypropylene, PP, was commercialized in 1957, and its first blends (with polyisobutylene, PIB, and polyethylene, PE) were patented in 1958. In 1960, du Pont started manufacturing ethylene-propylene, EPR, and three years later ethylene-propylene-diene, EPDM, copolymers [Gresham and Hunt, I960]. The first patent on impact modification of PP by addition of EPR dates from 1960. Direct reactor blending of PE/PP/EPR resulting in a thermoplastic polyolefin, R-TPO, dates from 1979. The newest (introduced in 1992) single-site metallocene catalysts generate polymers with controlled tacticity, co-monomer sequences, molecular... [Pg.16]

Sehanobish, K., et al, Constrained Geometry Single-Site Catalyst Technology Elastomers and Elastomers for Impact Modifications and Automotive Applications, Metallocene-Based Polyolefins, Preparation, Properties, and Technology, Volume 2, John Scheirs and Walter Kaminsky, eds., ISBN 978-0-471-99912-6, John Wiley Sons, New York, 2000. [Pg.44]


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See also in sourсe #XX -- [ Pg.86 ]




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