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Topic: Metallocene

Related Topics

Ferrocene

Organometallic chemistry

Cyclopentadiene

Organic chemistry

Polymerization

LDPE

Benzene

Polyethylene

Glass transition

Inorganic chemical reaction

Melting point

Phillips Petroleum Company

Phillips Petroleum

Ferrocene

In the News (Tue 8 Dec 09)

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	BENZOYLFERROCENE (FERROCENYL PHENYL KETONE)
		Metals known to form metallocene complexes are titanium, zirconium, hafnium, vanadium, chromium, molybdenum, tungsten, manganese, iron, ruthenium, osmium, cobalt, rhodium, and nickel.
		The commonest metallocene is ferrocene, yellow to orange crystal melting at 173 C, is an organometallic compound of sandwich structure.
		Metallocenes having catalytic site in systematic molecular structure are used as polymerization catalyst to produce uniform polymer with unique structures and physical properties.
	www.chemicalland21.com /industrialchem/organic/BENZOYLFERROCENE.htm (389 words)

	Patents in Class 556/53
		This invention relates to metallocene compounds represented by formula: ##STR00001## wherein M is a group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; E is a substituted or unsubstituted indenyl...
		This invention relates to a metallocene compounds represented by formula: ##STR00001## wherein M is a group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; E is an indenyl ligand that is substitute...
		The invention relates to a metallocene catalyst in which the metal is coordinated by any η 5 cyclopentadienyl ligand characterised in that said ligand is directly or indirectly substituted by a pendant siloxy or germyloxy group wh...
	www.freepatentsonline.com /CCL556-53.html (2041 words)

	Metallocene Catalysts Breakthrough
		Metallocene catalysts are becoming increasingly popular in the plastics industry.
		Metallocenes are made of a single metal atom held between two carbon rings.
		University of Rochester chemist Guillermo Bazan announced a breakthrough with metallocene catalysts by adding boron atoms to the standard structures.
	www.cheresources.com /metallocenezz.shtml (352 words)

	Reference.com/Encyclopedia/Metallocene
		Metallocenes of the type Cp M are not useful for catalysis.
		Metallocenes are a subset of a broader class of organometallic compounds called sandwich compounds.
		Neutral metallocenes are soluble in common organic solvents and can generally be purified by vacuum sublimation.
	www.reference.com /browse/wiki/Metallocene (400 words)

	Metallocene Summary
		Metallocenes are a type of organometallic complex, i.e., a chemical compound in which a metal atom is bonded to an organic structure.
		Metallocenes of all 3d-row elements are known, but with the exception of ferrocene all of these are sensitive to air, paramagnetic and do not possess a closed-shell electron structure (see 18-Electron rule).
		Derivatives of metallocenes include structures with an intramolecular bridge between the two cyclopentadienyl rings (ansa-metallocenes), compounds with just one facially-bound planar organic ligand (half-sandwich compounds), compounds with three Cp anions and two metal cations in alternating order (tripledecker configuration) and compounds where one cyclopentadienyl ligand is replaced by three other ligands (piano stool configuration).
	www.bookrags.com /Metallocene (804 words)

	[Report] Metallocene & Single Site Polymers to 2009
		Demand for metallocene and single-site polymers is projected to advance 20 percent per year to 5.1 billion pounds in 2009, valued at $5.3 billion.
		Metallocene and single-site polymers are expected to account for about nine percent of the total market for polyolefin polymers in 2009.
		Metallocene film and sheet, the leading application for metallocene polymers, is expected to grow at a slightly below average pace through 2009 to 2.8 billion pounds.
	www.the-infoshop.com /study/fd29020_metallocene.html (491 words)

	Metallocenes: Introduction
		Metallocene based catalyst technology is expected to revolutionize the immense polyolefin industry, particularly in polyethylene and polypropylene markets.
		Metallocenes are a relatively old class of organometallic complexes, with ferrocene being the first discovered in 1951.
		The MAO cocatalyst is believed to i) alkylate the metallocene, forming the active complex, ii) scavenge for impurities, iii) stabilize the cationic center in an ion-pair interaction, and iv) possibly prevent bimetallic deactivation processes from occurring.
	www.chem.ucalgary.ca /groups/ziegler/met_intro.html (798 words)

	Metallocene-Based Polyolefins: Preparation, Properties and Technology
		The first patent for a metallocene catalyst was filed in 1980 but it has been the last five years that have seen a dramatic increase in the volume of research into metallocenes and the maturing of metallocene technology.
		Metallocenes as Catalysts for the Copolymerization of Ethene with Propene and Dienes
		Homo- and Copolymerization of Cycloolefins by Metallocene Catalysts
	www.polysurfacesbookstore.com /pages/3616.html (407 words)

	Metallocene-Catalysed Polymerisation (Datos del libro)
		In metallocene catalysis, polymerisation takes place at a defined transition metal centre, which provides a means to control monomer insertion and other reaction steps precisely.
		The variety of metallocenes available is increasing, the range includes titanocenes, hafnocenes, and zirconocenes with different symmetries, which give tailored polymers of totally different structures.
		Metallocenes provide a tool for producing ‘designer polymers’, giving the polymer technologist the ability to vary structure and properties to match different applications.
	www.plastunivers.com /Tecnica/Libreria/titulo.asp?L=1513 (409 words)

	Mastio & Company Metallocene Press Release
		Metallocene resin displacement of these five resins will near 2.9 billion pounds by 2004, over 77% of the total volume of metallocene resins.
		Metallocene penetration is also examined in key markets as diverse as adhesives and sealants, automotive parts, disposable medical packaging and disposable products, flexible foam products, plastic closures, and wire and cable insulation and jacketing.
		Part II traces the development of metallocene catalysts and resins from the patenting of the "Kaminsky catalyst" in 1980 to the introduction of commercial grades of metallocene resins in 1991 to the product and technology announcements of major resin producers through 1995.
	www.mastio.com /press/mepress.html (580 words)

	Chemical & Engineering News
		Because metallocene catalysts often can be substituted in existing processes, the most significant cost factor, say polymer and catalyst producers, has been the catalyst and, even more specifically, the cocatalyst used.
		Metallocene catalysts cost from a few thousand to several thousand dollars per pound, many times the cost of traditional Ziegler-Natta catalysts.
		Hoechst, a major developer of polypropylene metallocene technology, says the catalysts are "already in a cost-performance domain where the economic scale-up of [their synthesis] becomes an important factor" for long-term competition.
	pubs.acs.org /hotartcl/cenear/950911/art02.html (652 words)

	Metallocene Catalysis Polymerization
		Metallocene polymerization is making a big stir in the plastics business.
		Metallocene polymerization is also good for making polymers of very specific tacticities.
		Again, I could give simple answer that a metallocene is a positively charged metal ion sandwiched between two negatively charged cyclopentadienyl anions.
	www.pslc.ws /mactest/mcene.htm (2055 words)

	"Technical Paper Series: Performance Properties of Metallocene Polyethylene, EVA, and Flexible PVC Films" (MPB archive, ...
		As manufacturers of medical devices and supplies continue efforts to conserve resources and reduce waste, they are seeking new materials that can meet application needs while providing opportunities for volume or weight reduction.
		Among the materials that have been introduced as alternatives to flexible PVC are films made with metallocene polyethylene (mPE) or ethylene-vinyl acetate (EVA) resins.
		Lipsitt B, "Metallocene Polyethylene Films as Alternatives to Flexible PVC Film for Medical Device Fabrication," in Proceedings of the Society of Plastics Engineers, Inc., Annual Technical Conference (ANTEC 97), Brookfield, CT, SPE, pp 2854–2858, 1997.
	www.devicelink.com /mpb/archive/98/09/004.html (2437 words)

	Albemarle Corporation - Catalysts - Polyolefin - Metallocenes
		We realize that metallocene structures are typically the result of intensive (and expensive) exploration by polymer producers, and metallocene performance is intimately connected with the polymer's architecture and the reaction process.
		We manufacture more metallocenes than anyone else in the world, and we've worked on metallocene synthesis for nearly forty years.
		In fact, we produced hundreds of metallocene structures in the 1950's and 1960's during our research on improved gasoline combustion modifiers.
	www.albemarle.com /Products_and_services/Catalysts/Polyolefin/Metallocenes (237 words)

	Solid metallocene catalyst system page
		A solid metallocene-containing catalyst system of an organoaluminoxane, at least one metallocene having at least one olefinically unsaturated substituent and a polyolefin is disclosed.
		The polyolefin is formed from at least one olefin polymerized in the presence of a combination of a solution of the organoluminoxane in an aromatic liquid, the at least one metallocene, and an aliphatic liquid.
		Полиолефин сформирован от по крайней мере одного олефина полимеризованного in the presence of комбинация разрешения organoluminoxane в ароматичной жидкости, по крайней мере одном metallocene, и алифатической жидкости.
	www.patentalert.com /docs/001/z00160585.shtml (153 words)

	Metallocene catalysts with lewis acids and aluminum alkyls (US5561092)
		The Lewis acid must be of sufficient acidity to ionize a neutral metallocene compound to form a cationic metallocene catalyst.
		Any metallocene catalyst compound having two cyclopentadienyl rings, substituted or unsubstituted, attached to a transition metal which can be ionized by a Lewis acid would be useful in this invention.
		wherein the ligands of the Lewis acid are not reactive with the metallocene cation, and
	www.delphion.com /details?pn=US05561092__ (418 words)

	Metallocene Polyolefins expected to grow at 20% between 2004-2009 in USA
		Metallocene Polyolefins expected to grow at 20% between 2004-2009 in USA
		A leading market research company has recently concluded that Metallocene Polyolefins (PE/PP) in USA will grow from 772 KT in 2004 to almost 2 million tons in 2009.
		Western European consumption of metallocene PE saw an increase from 350,000 tons in 2002 to 483,000 tons in 2004.
	www.plastemart.com /upload/literature/metallocenepolyolefins.asp (155 words)

	Alibris: Metallocenes
		That terms like sandwich complexes or the concept of compounds without direct chemical bonds between the central metal atom and the ligating atoms are nowadays common knowledge can be attributed to the sensational discovery of ferrocene in the early 1950s.
		Metallocene is a well known sandwich complex with two cyclopentadienyl ligands such as ferrocene.
		Recently, such metallocene compounds have been found to be very characteristic and they have become very important, not only in the area of organic synthesis, but also in polymerization in industry.
	www.alibris.com /search/books/subject/Metallocenes (342 words)

	News \| Gainesville.com \| The Gainesville Sun \| Gainesville, Fla. (Site not responding. Last check: )
		Metallocene catalysts are homogeneous single-site systems, implying that there is a single, uniform type of catalyst present in the system.
		The catalysts are able to homopolymerize ethylene to a variety of structures that range from high density polyethylene through hydrocarbon plastomers and elastomers to hyperbranched hydrocarbon oils by a mechanism referred to as 'chain-walking.'.
		As opposed to metallocenes, they can also randomly copolymerize ethylene with polar comonomers such as methyl acrylate.
	www.gainesville.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Post-metallocene_catalyst (767 words)

	News \| Gainesville.com \| The Gainesville Sun \| Gainesville, Fla. (Site not responding. Last check: )
		Metallocenes are a subset of a broader class of organometallic compounds called sandwich compounds.
		Many metallocenes have proven to be useful for catalysis.
		One of the more important commercial uses for metallocenes is olefin polymerization with cationic group 4 metallocene derivatives related to 2
	www.gainesville.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=metallocene (388 words)

	Macromolecular Chemistry I: Publications: Use of metallocene complexes of metals in the 4th sub-group of the periodic ... (Site not responding. Last check: )
		Macromolecular Chemistry I: Publications: Use of metallocene complexes of metals in the 4th sub-group of the periodic table as triplet emitters in organic light-emitting diodes (OLEDs).
		The invention relates to the use of metallocene complexes of metals in the 4th sub-group of the periodic table as emitter mols.
		The use is described of Group IVB metallocene complexes, esp. hafnocenes and zirconocenes, in org.
	www.uni-bayreuth.de /content/mci/en/pub/patent/detail.php?id_obj=27824 (161 words)

	Polyolefin Elastomers - Chemistry and Processing of Polyolefin Elastomers ( POE )
		The metallocene catalyst selectively polymerises the ethylene and comonomer sequences and increasing the comonomer content will produce polymers with higher elasticity as the comonomer incorporation disrupts the polyethylene crystallinity.
		Polyolefin elastomers are produced using refined metallocene catalyst often referred to as single-site or constrained geometry catalysts.
		The metallocene catalyst can be used in a number of polymerisation processes including slurry, solution, and gas phase operations.
	www.azom.com /details.asp?ArticleID=1960 (496 words)

	Accelrys
		The industrial importance of metallocene based olefin polymerization has increased significantly in recent years.
		The interaction between cationic metallocene complexes and ethylene in gas phase was studied in a triple stage mass spectrometer.
		In fact, NMR spectra show that no polarized complexes are observed with zirconium metallocenes - alkylaluminum systems and this observation confirms the generally accepted hypothesis that the catalytic activity is related to the formation of strongly polarized or cationic like species [10].
	www.accelrys.com /reference/cases/studies/enichem_full.html (1386 words)

	The ABB Group: Novolen launched its next generation of advanced metallocene PP catalysts
		The focus of our computational and experimental RandD activities is to deliver tailored metallocene catalysts as a source for value added polypropylene applications, such as high tenacity spun-bonded and melt blown fibers, and random and impact co-polymers with superior balance of properties," explained Dr. Andreas Winter, head of RandD catalyst development.
		Novolen offers comprehensive and tailored metallocene technology license packages to PP producers who want to upgrade their product portfolio, including versatile high performance metallocene polymerization catalysts, intellectual property rights and support for process and product implementation.
		Novolen Technology Holdings C.V., a joint venture of ABB and Equistar, is a leading polypropylene technology provider with extensive research facilities in the United States and Europe.
	www.abb.com /cawp/seitp202/1d54ef1eaa5ebe80852571a200566b21.aspx (302 words)

	Metallocene Catalyzed Polymers
		In the first part of the book, catalysts and their effect and economy are discussed for the major groups of polymers in which these catalysts found their commercial applications.
		The second part discusses the effect of metallocene catalysts on key processing properties of metallocene catalyzed polymers.
		The last is further developed in the series of contributions on the impact of metallocene catalyzed polymers on the future position of various traditional polymeric materials.
	www.chemtec.org /books/book1-22.html (186 words)

	Alexander's Gas & Oil Connections - Exxon wins metallocene catalyst patent suit (Site not responding. Last check: )
		"With metallocene catalysts revolutionising the plastics industry, the value of this technology to the polyolefins marketplace is enormous," Nesbitt continued.
		Exxon Chemical is a recognised world-wide leader in the highly-specialised field of metallocene catalysis.
		Exxpol(R) metallocene catalysts are used primarily to manufacture plastics and rubber, and are considered "smart" catalysts because they provide better manufacturing control of product quality and improve end-use products.
	www.gasandoil.com /goc/company/cnn84263.htm (195 words)

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