· John Severn completed his Ph.D. at the University of Sussex and joined the group of Prof. R. van Santen at the Eindhoven University of Technology as a postdoc, working on the immobilization of alpha-olefin polymerization catalysts and the use of ...
· The catalysts for olefin polymerization may be divided into two vast classes according to the method of formation of the propagation center: two-component and one-component.'' Two-component systems are obtained by the interaction of transition metal compounds of groups IV-VIII of the periodic system with organometallic compounds of groups 1-111 elements (Ziegler-Natta catalysts).
Designing Polymerization Reaction Systems. Important considerations in polymerization reactor design include heat removal, kinetics, and process dynamics, as well as polymer properties and product quality. Polymer reaction engineering is an interesting field, …
· The components used to prepare the catalysts were as follows: VOCl 3, which was preliminarily distilled ... One of the important problems of the olefin polymerization catalysis is the immobilization of MAO-activated homogeneous metallocene catalysts for their ...
A catalyst component for olefin polymerization, prepared by bringing a titanium-containing solid which comprises (a) a metal oxide, (b) an organomagnesium compound represented by the following general formula: R 1>MgR2> wherein R1> and R2> each represents a hydrocarbon group containing from 1 to 20 carbon atoms, a halogen atom, or an OR3> group in which R3> represents a hydrocarbon group ...
olefin polymerization mixture bis compound Prior art date 1993-06-07 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Xiao‐Wei Kan, Xin‐Xing Deng, Fu‐Sheng Du, Zi‐Chen Li, Concurrent Oxidation of Alcohols and the Passerini Three‐Component Polymerization for the Synthesis of Functional Poly(ester amide)s, Macromolecular Chemistry and Physics, 10.1002/macp.201400264,
The olefin polymerization catalyst components of the present invention are characterized by comprising an organoaluminum oxy-compound [A] having less than 10% in terms of Al atom of Al component dissolving in benzene kept at 60 C. The first olefin [A] an ...
· The olefin polymerization process can be divided in three phases involving (1) activation of a neutral (usually 16e −) precursor, leading to an IP, (2) coordination of the olefin, with the consequent displacement of the counterion from a coordination site to the second coordination sphere, and (3) multiple migratory insertions of olefin into the M–R bond, resulting in the polymer chain (P ...
· Cationic active sites responsible for olefin polymerization can be obtained by reaction of the neutral ligands with nickel precursors such as (DME)NiBr 2 and then activated by aluminum reagents. Dibromide complexes [N,N]NiBr 2 can be further methylated using MeMgBr and treated with H(Et 2 O) 2 BArF to give [N,N]NiMe(OEt 2 ) cationic Ni-Me species ( Fig. 3 a) [23] .
· Olefin Polymerization with Ziegler-Natta Catalyst. The Ziegler-Natta (ZN) catalyst, named after two chemists: Karl Ziegler and Giulio Natta, is a powerful tool to polymerize α-olefins with high linearity and stereoselectivity (Figure 1). A typical ZN catalyst system usually contains two parts: a transition metal (Group IV metals, like Ti, Zr ...
· During the past 50 years, polyolefins have become, by far, the highest volume commercial class of synthetic polymers. Olefin polymerization catalysts have evolved during this time from heterogeneous mixtures to well-defined soluble molecules (), allowing chemists to understand and control the effects of catalyst structure on polymer composition and microstructure.
The present invention relates to a catalyst component that is used for olefin (copolymerization) polymerization and in particular to being used for the preparation of LLDPE. The catalyst component comprises Mg, Ti, halogen and electron donor compounds (ED) of ether, ester, amine or nitrile and is characterized in that the mol ratio of Mg and Ti is more than 5; and the mol ratio of ED and Ti is ...
· Polymerization olefin catalyst components has been depicted in Figure 8 including a metal, ligand(s), a growing polymer chain, a coordinated olefin, and a cocatalyst [40-42]. As can bee seen in Figure 8, FI catalysts are heteroatom [O-, N] …
· olefin polymerization olefin oligomerization NMR spectroscopy chemical shift tensor analysis frontier molecular orbitals Oligomerization and polymerization processes are a highly active field of research (1 –5) and at the heart of the petrochemical industry, producing α-olefins and polyolefins, respectively, that are some of the most important commodity chemicals and polymers ().
· Special Issue Information. Since the Nobel Prize winning discovery made by Ziegler and Natta, transition-metal-catalyzed olefin polymerization has enjoyed great success in both industry and academia. Currently, polyolefin materials constitute almost half of the 300 million tons of the worldwide plastics production.
· effects. Therefore, catalytic olefin polymerization activity, which is already very high for the previously studied catalysts, increase considerably by attaching para-amino groups to the chelating pyridine or quinoline, respectively. Combining electron-rich indenyl para
Single component catalysts for polymerization of olefins based on organoscandium and organoyttrium compounds of the types ( η5-C5Me5)2Sc-R, {( η5-C5Me4)2SiMe2} Sc-R
· Clathrochelates have apparently not been suggested as components of catalysts for olefin polymerization. On the other hand, the ability to incorporate transition metals and/or Group 13 atoms in the apical (or capping) positions of clathrochelates provides an as-yet unexplored opportunity to use the unique electronics of clathrochelates for tuning an olefin polymerization reaction.
An alpha-olefin (or α-olefin) is an alkene where the carbon-carbon double bond starts at the α-carbon atom, i.e. the double bond is between the #1 and #2 carbons in the molecule. Alpha-olefins such as 1-hexene may be used as co-monomers to give an alkyl branched polymer (see chemical structure below), although 1-decene is most commonly used for lubricant base stocks.
Cocatalysts for Metal-Catalyzed Olefin Polymerization: Activators, Activation Processes, and Structure−Activity Relationships Eugene You-Xian Chen* The Dow Chemical Company, Catalysis R&D, Midland, Michigan 48674 Tobin J. Marks* Department of Chemistry
Vanadium-based catalyst system for olefin polymerization. China Patent, CN 106977633A, 2016-01-18 (in Chinese) [,,,,, . .
Solid catalyst components and catalysts for olefin polymerization - Patent JP-3745982-B2 - PubChem. National Center for Biotechnology Information. 8600 Rockville Pike, Bethesda, MD, 20894 USA. Contact. Policies. FOIA. National Library of Medicine. National Institutes of Health. Department of Health and Human Services.
· Lesson Summary. Polymerization is the process of forming larger macromolecules from simpler sub-units known as monomers. The two major types of polymerization are addition polymerization and ...
· @article{osti_1132301, title = {FINAL TECHNICAL REPORT Synthetic, Structural and Mechanistic Investigations of Olefin Polymerization Catalyzed by Early Transition Metal Compounds}, author = {Bercaw, John E.}, abstractNote = {The goal of this project is to develop new catalysts and provide understanding of ligand effects on catalyst composition in order to guide …
Polymerization and alkylation The light gaseous hydrocarbons produced by catalytic cracking are highly unsaturated and are usually converted into high-octane gasoline components in polymerization or alkylation processes. In polymerization, the light olefins propylene and butylene are induced to combine, or polymerize, into molecules of two or three times their original molecular weight.
Olefin, compound made up of hydrogen and carbon that contains one or more pairs of carbon atoms linked by a double bond. Olefins are important commercial petrochemicals and are produced through various methods, including fluid catalytic cracking. Learn …
7, 34 Of course, the olefin polymerization behavior of Cp 2 ZrCl 2 and to a lesser extent Cp 2 ZrMe 2 upon activation with MAO has been extensively studied, and both precursors require a large Al ...
· Severn JR, Chadwick JC, Duchateau R, Friederichs N (2005) Bound but not gagged-immobilizing single-site alpha-olefin polymerization catalysts. Chem Rev 105(11):4073–4147 CAS Article Google Scholar 17.
WO2018158966A1 - Metallocene compound, catalyst component for olefin polymerization and catalyst for olefin polymerization including same, and method for producing olefin polymer using catalyst for olefin polymerization - Google Patents Metallocene compound ...
· Olefin Polymerization - Catalysts from Group 10 to Group 4. Download PDF Copy. Interview conducted by Dr. Changle Chen Nov 27 2011. The development of catalysts that are capable of polymerizing or copolymerizing functionalized vinyl monomers (CH2=CHX) by insertion mechanisms would enable the synthesis of new polyolefins with enhanced properties.
· Scope of Olefin Polymerization Nickel Catalysts. K. Aleksander Ostoja Starzewski. Bayer AG, Central Research Department, 51368 Leverkusen, Germany. Todd R. Younkin. Arnold and Mabel Beckman Laboratories for Chemical Synthesis, California Institute of Technology, Pasadena, CA 91125, USA To whom correspondence should be addressed. Eric F. Connor ...
Controlled radical polymerization is a means of manufacturing highly branched three-dimensional macromolecules known as hyperbranched polymers. It might employ inimers, compounds containing an initiating group and a vinyl group in one molecule, or transmers, a compound containing a chain transfer group and a vinyl group in one molecule.