Patents Examined by R. Rabago
  • Patent number: 6610805
    Abstract: New ligands having a backbone comprised of NCCX can be combined with a metal or metal precursor compound or formed into a metal-ligand complex to catalyze a number of different chemical transformations, including polymerization.
    Type: Grant
    Filed: October 5, 2000
    Date of Patent: August 26, 2003
    Assignee: Symyx Technologies, Inc.
    Inventors: Anil S. Guram, Anne Marie LaPointe, Howard W. Turner, Tetsuo Uno
  • Patent number: 6610800
    Abstract: Ethylene-based polymer blends having an MWD of at least about 2 are made in a single reactor using a mixed constrained geometry catalyst (CGC) system. The process comprises the steps of contacting under polymerization conditions and in a single reaction vessel (i) ethylene, (ii) at least one C3-C20 &agr;-olefin, (iii) optionally, at least one polyene, and (iv) a mixed CGC system.
    Type: Grant
    Filed: January 3, 2002
    Date of Patent: August 26, 2003
    Assignee: DuPont Dow Elastomers LLC
    Inventors: Michael K. Laughner, Debra J. Mangold, Deepak R. Parikh
  • Patent number: 6608137
    Abstract: Stable, gel-free, water-in-oil microdispersions comprising a continuous phase of an oil and an emulsifier and a discontinuous phase of an aqueous solution of a hydroxamated vinyl polymer are disclosed. Also disclosed is a method for the production of the above-described microdispersions wherein neutralized hydroxylamide and excess base are reacted with a microdispersion of the vinyl polymer.
    Type: Grant
    Filed: December 17, 1993
    Date of Patent: August 19, 2003
    Assignee: Cytec Technology Corp.
    Inventors: Howard Ivan Heitner, Roderick Glyn Ryles
  • Patent number: 6596827
    Abstract: Disclosed are olefin polymerization methods comprising the use of the following compounds: wherein M is a metal atom, R1-R8 are univalent radicals, X1 and X2 are univalent ligands, X3 is a divalent ligand, and (RnY—T) is an optional donor or non-donor group. The relatively stable and simply synthesized pre-catalyst is activated by a co-catalyst under mild reaction conditions, producing exceptionally reactive polymerization of a wide variety of alpha-olefin monomers, and forming a variety of poly(alpha-olefin) products, having high molecular weight and low molecular weight distribution (PDIs close to 1). Living polymerization is performed at or above room temperature, along with achieving block co-polymerization of alpha-olefin monomers at room temperature, and producing polymers and oligomers having a wide range of molecular weights.
    Type: Grant
    Filed: July 13, 2001
    Date of Patent: July 22, 2003
    Assignees: Ramot at Tel Aviv University Ltd., Bar Ilanresearch and Development Company Ltd.
    Inventors: Moshe Kol, Edit Y. Tshuva, Zeev Goldschmidt
  • Patent number: 6593442
    Abstract: A semicrystalline propylene polymer composition with good suitability for producing biaxially oriented films and prepared by polymerizing propylene, ethylene and/or C4-C18-1-alkenes, where at least 50 mol % of the monomer units present arise from the polymerization of propylene. Also described is the use of the semicrystalline propylene polymer composition for producing films, fibers or moldings, the films, fibers and moldings made from these compositions, biaxially stretched films made from the semicrystalline propylene polymer compositions, and also a method for characterizing the semicrystalline propylene polymer compositions.
    Type: Grant
    Filed: December 18, 2000
    Date of Patent: July 15, 2003
    Assignee: Basell Polypropylen GmbH
    Inventors: Wolfgang Bidell, Roland Hingmann, Franz Langhauser, Dieter Lilge, Volker Rauschenberger, Günther Schweier, Florian Stricker, Jürgen Suhm
  • Patent number: 6590055
    Abstract: This invention relates to olefin polymers particularly suited to satisfying the dielectric properties required in electrical device use. The olefin polymers can be prepared by contacting polymerizable olefin monomers with catalyst complexes of Group 3-11 metal cations and noncoordinating or weakly coordinating anion compounds bound directly to the surfaces of finely divided substrate particles or to polymer chains capable of effective suspension or solvation in polymerization solvents or diluents under solution polymerization conditions. Thus, the invention includes polyolefin products prepared by the invention processes, particularly ethylene-containing copolymers, having insignificant levels of mobile, negatively charged particles as detectable by Time of Flight SIMS.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: July 8, 2003
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventor: Patrick Brant
  • Patent number: 6586541
    Abstract: Polyolefins, especially branched polyethylenes, can be made by combining a catalyst that can oligomerize ethylene to one or more alpha-olefins and a polymerization catalyst which can copolymerize ethylene and &agr;-olefins, by first carrying out the process in, for example, a continuous stirred tank reactor or its equivalent, and then in a plug flow reactor or its equivalent. The process minimizes the occurrence of (unreacted) &agr;-olefins in the final polymer product.
    Type: Grant
    Filed: January 30, 2001
    Date of Patent: July 1, 2003
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Joel David Citron
  • Patent number: 6586540
    Abstract: The invention relates to a method for the production of copolymer based on ethylene by continuous copolymerization of ethylene and comonomer in a reactor in the presence of a catalyst. In this method, in a first step of the copolymerization, a mixture comprising ethylene and comonomer of such a composition that a copolymer-containing coating deposits in the reactor is metered into the reactor and/or generated in the reactor, and, in a second step, the concentration of the comonomer in the metered-in mixture and/or in the mixture generated in the reactor is reduced sufficiently and/or the concentration of the ethylene in the metered-in mixture and/or in the mixture generated in the reactor is increased sufficiently that the coating is removed from the reactor either partially or completely. The method has the advantage that the production of copolymer does not have to be interrupted during cleaning of the reactor.
    Type: Grant
    Filed: July 19, 2001
    Date of Patent: July 1, 2003
    Assignee: Basell Polyolefine GmbH
    Inventors: Paulus De Lange, Volker Billert, Bernd Brunner, Werner Ritter, Andreas Deckers
  • Patent number: 6583254
    Abstract: A propylene-based polymer having a melt flow rate of 0.1 to 20 g/10 min. and a melting point Tm (° C.) measured by using a differential scanning calorimeter (DSC) of 147 to 159° C., in which the half width HW (° C.) of the melting peak measured by using a differential scanning calorimeter (DSC) and the melting point Tm (° C.) satisfy the relation: HW≦(188−Tm)/5.
    Type: Grant
    Filed: October 23, 2001
    Date of Patent: June 24, 2003
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Mitsuji Tsuji, Kenichiro Yada, Syunji Yunoki
  • Patent number: 6579957
    Abstract: Single-site catalysts useful for polymerizing olefins are disclosed. The catalysts incorporate a Group 3 to 10 transition, lanthanide, or actinide metal and an anionic thiopyran dioxide ligand. Because a wide variety of thiopyran dioxides are easy to prepare from commercially available starting materials, the invention enables the preparation of a new family of single-site catalysts.
    Type: Grant
    Filed: April 11, 2001
    Date of Patent: June 17, 2003
    Assignee: Equistar Chemicals, LP
    Inventors: Gregory G. Hlatky, Sandor Nagy
  • Patent number: 6579962
    Abstract: A process for the production of biaxially-oriented polypropylene film involving the provision of a polypropylene polymer produced by the polymerization of propylene in the presence of a metallocene catalyst characterized by a bridged racemic bis(indenyl) ligand substituted at the proximal position. The polypropylene contains 0.5 to 2% 2,1 insertions and has an isotacticity of at least 96% meso pentads and at least 99% meso diads. The film is formed by stressing the polymer produced from a slot die in the machine direction at a stretch ratio of about 5 or 6 and in the transverse direction at a stretch ratio of about 8 or 9 to produce a biaxially-oriented film having a non-uniform melt temperature of a peak value of less than 160° C. The polypropylene polymer has meltflow index of less than 5 grams per 10 minutes and has an average molecular weight within the range of 100,000-400,000 grams per mole.
    Type: Grant
    Filed: May 22, 2000
    Date of Patent: June 17, 2003
    Assignee: Fina Technology, Inc.
    Inventors: William R. Wheat, Aiko Hanyu
  • Patent number: 6579956
    Abstract: A method for producing a polymer by coordination polymerization, comprising the steps of (a) reacting an unsaturated polar monomer having a functional group releasing a proton or a salt of the unsaturated polar monomer, with a masking agent comprising a halogenated organometallic compound or a organoaluminum compound capable of masking the functional group to form a corresponding masked monomer; and (b) polymerizing the masked monomer either alone or in combination with another monomer in the presence of the coordination polymerization catalyst to obtain the polymer.
    Type: Grant
    Filed: June 7, 2001
    Date of Patent: June 17, 2003
    Assignees: Kabushiki Kaisha Toyota Chuo Kenkyusho, University of Massachusetts
    Inventors: Hiromitsu Tanaka, Bruce M. Novak
  • Patent number: 6573343
    Abstract: Olefin polymers are prepared in a plurality of polymerization stages, optionally in a plurality of polymerization reactors, in the presence of hydrogen and an olefin polymerization multisite catalyst, preferably a dualsite catalyst, having at least catalytic sites A and B, site A capable of yielding polymers of different molecular weights and differing MFR2 or MFR21 depending on the concentration of hydrogen in the polymerization reactor and site B capable of yielding polymers of certain molecular weight and MFR2 or MFR21 depending on the concentration of hydrogen in the polymerization reactor where the ratio between MFR2 or MFR21 of polymers produced by site B at two different selected hydrogen concentrations is less than ten and the ratio between MFR2 or MFR21 of polymers produced by site A at the same hydrogen concentrations is more than 50.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: June 3, 2003
    Assignee: Borealis Technology Oy
    Inventor: Arild Follestad
  • Patent number: 6573345
    Abstract: The present invention is directed to processes of polymerizing olefin monomers and copolymerizing olefin monomer(s) with functionalized alpha-olefin monomers in the presence of certain late transition metal pyrrolaldimine chelates, especially bidenate or in the presence of a combination of a transition metal in its zero valence and a pyrrolaldimine represented by the formula: wherein each R1, R2, R3, R4, R5, R6, M and L are defined in the specification herein below.
    Type: Grant
    Filed: January 15, 1998
    Date of Patent: June 3, 2003
    Assignee: Cryovac, Inc.
    Inventors: Donald Albert Bansleben, Stefan K. Friedrich, Todd Ross Younkin, Robert Howard Grubbs, Chunming Wang, Robert Tan Li
  • Patent number: 6573353
    Abstract: Disclosed herein are processes for polymerizing ethylene, acyclic olefins, and/or selected cyclic olefins, and optionally selected olefinic esters or carboxylic acids, and other monomers. The polymerizations are catalyzed by selected transition metal compounds, and sometimes other co-catalysts. Since some of the polymerizations exhibit some characteristics of living polymerizations, block copolymers can be readily made. Many of the polymers produced are often novel, particularly in regard to their microstructure, which gives some of them unusual properties. Numerous novel catalysts are disclosed, as well as some novel processes for making them. The polymers made are useful as elastomers, molding resins, in adhesives, etc.
    Type: Grant
    Filed: September 12, 2000
    Date of Patent: June 3, 2003
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Maurice S. Brookhart, Lynda Kaye Johnson, Christopher Moore Killian, Elizabeth Forrester McCord, Stephan James McLain, Daniel Joseph Tempel
  • Patent number: 6569963
    Abstract: A process for controlling the MWD of a broad or bimodal resin in a single fluid bed reactor using a mixed catalyst composition containing a bimetallic catalyst and a make-up catalyst of at least one metallic component of the bimetallic catalyst. The bimetallic catalyst, which is formed with at least one metallocene of a transition metal, produces broad or bimodal molecular weight distribution polyolefin resin whose composition depends on the ratio of the concentration of the two catalyst components producing the HMW/LMW components. The make-up catalyst consisting of a single metal component is added in proportion necessary to make-up the deficiencies in the amount of the HMW/LMW component. The type of make-up catalyst added depends on whether increase of the HMW or LMW component produced by the bimetallic catalyst is sought. The mixed catalyst compostion may be fed into the reactor as a mixture or through separate catalyst ports of the reactor.
    Type: Grant
    Filed: May 9, 2002
    Date of Patent: May 27, 2003
    Assignee: ExxonMobil Oil Corporation
    Inventors: Thomas E. Nowlin, Sandra D. Schregenberger, Pradeep P. Shirodkar, Grace O. Tsien
  • Patent number: 6562920
    Abstract: This invention relates to olefin polymerization processes suitable for limiting or eliminating aromatic solvents or diluents. The invention processes can be conducted by contacting polymerizable olefin monomers with catalyst complexes of Group 3-11 metal cations and noncoordinating or weakly coordinating anions bound directly to the surfaces of finely divided substrate particles or to polymer chains capable of effective suspension or solvation in polymerization solvents or diluents under polymerization conditions. These processes minimize problems associated with using largely insoluble organometallic or organometalloid catalysts and cocatalysts in aliphatic, solution, or diluent polymerization processes.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: May 13, 2003
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventor: Patrick Brant
  • Patent number: 6562930
    Abstract: Bis(salicylaldiminato)titanium complex with optionally substituted phenyl or cyclohexyl on nitrogen catalyzes highly syndiospecific polymerization of propylene. Syndiotactic polypropylene with defects of the type rmr having [rrrr] content greater than 0.70 and block copolymer containing block(s) of the syndiotactic polypropylene and block(s) of poly(ethylene-co-propylene) and/or poly(alpha-olefin-co-propylene) are obtained. Certain of the catalysts provide living polymerization. Living olefin polymers and olefin terminated oligomers and polymers are also products.
    Type: Grant
    Filed: September 18, 2001
    Date of Patent: May 13, 2003
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Geoffrey W. Coates, Jun Tian, Phillip D. Hustad
  • Patent number: 6562918
    Abstract: A catalyst for olefin polymerization, which is obtained by contacting (A) a compound of a transition metal of Groups 4 to 6 of the Periodic Table, (B) an organoaluminiumoxy compound, and optionally (C) a carrier with each other, and for which they are exposed to elastic waves at least in any step of contacting them with each other. Preferably, the elastic waves are ultrasonic waves falling between 1 and 1000 kHz. Provided are high-activity metallocene catalysts for olefin polymerization. As having high polymerization activity, they are favorable to vapor-phase or slurry polymerization for producing olefinic polymers.
    Type: Grant
    Filed: October 4, 2000
    Date of Patent: May 13, 2003
    Assignee: Idemitsu Petrochemical Co., Ltd.
    Inventors: Yutaka Minami, Masami Kanamaru
  • Patent number: 6559247
    Abstract: A process and apparatus for passing a polymerization effluent, comprising solid polymer, unreacted monomer, diluent and minor amounts of contaminants, to a high pressure flash where most of the fluid components are flashed and wherein a slip stream comprising diluent and minor amounts of monomer is separated from the bulk of the flashed fluid components. The slip stream is subjected to olefin removal to give an essentially olefin-free stream for recycle to a catalyst mud preparation area. The bulk of the flashed fluid components are recycled directly back to the polymerization zone without expensive olefin removal, although treatment to remove other contaminants can optionally be performed. The polymer and entrained fluid is passed to a low pressure flash zone where the fluids are flashed off, compressed and joined with the flash from the high pressure flash tank.
    Type: Grant
    Filed: July 17, 2002
    Date of Patent: May 6, 2003
    Assignee: Chevron Phillips Chemical Company, LP
    Inventors: Scott E. Kufeld, David H. Burns, Ragavan Vaidyanathan