Patents Examined by Alan Holler
  • Patent number: 4215207
    Abstract: Process and device for cooling a mixture of polymer and monomer from a reactor in which ethylene is polymerized or copolymerized at a pressure greater than 1,000 bars between a pressure-reduction valve located downstream of the reactor and a medium pressure separator. The cooling is achieved by injecting monomer at a pressure below that of the separator using a device with a nozzle cross-section S.sub.1 through which the mixture from the reactor passes, a convergent mixing zone in which the mixture is mixed with the monomer injected, which is supplied at a flow rate q, and a diffuser of throat cross-section S.sub.3, which makes it possible to bring the mixture to the pressure of the separator. The dimensions of the device are such that the ratio Q/S.sub.1 is between 0.20 and 1.35 t/hr.mm2 and the ratio (q+Q/S.sub.3 is between 0.1 and 0.3 t/hr.mm2.
    Type: Grant
    Filed: June 3, 1976
    Date of Patent: July 29, 1980
    Assignee: Societe Chimique des Charbonnages-CdF Chimie
    Inventors: Pierre Durand, Pierre Charlon, Guy Jouffroy
  • Patent number: 4186260
    Abstract: A method for preparing a composition of matter comprising silica and titanium, convertible to a catalyst suitable for olefin polymerization by the addition of chromium and the process performable therewith, the preparation involving adding an alkali metal silicate to an acid containing a titanium compound, and recovering a dry gel for use as a polymerization catalyst upon the addition of chromium.
    Type: Grant
    Filed: August 1, 1978
    Date of Patent: January 29, 1980
    Assignee: Phillips Petroleum Company
    Inventor: Richard E. Dietz
  • Patent number: 4184028
    Abstract: Olefin polymerization catalysts are prepared by depositing an organophosphoryl chromium product and an aluminum compound on an inorganic support material, and heating the support material in a non-reducing atmosphere at a temperature above about 300.degree. C. up to the decomposition temperature of the support material.
    Type: Grant
    Filed: June 29, 1977
    Date of Patent: January 15, 1980
    Assignee: National Petro Chemicals Corporation
    Inventors: Louis J. Rekers, Stanley J. Katzen, Jerome H. Krekeler
  • Patent number: 4182810
    Abstract: An olefin or mixture of olefins is polymerized in a hydrocarbon diluent in a turbulent reaction zone to produce particles of polymer which are substantially insoluble in the diluent (particle form process). Fouling of the reactor by adherence of polymer particles to the walls of the reactor is reduced by adding to the reaction medium a composition which comprises a mixture of (a) a polysulfone copolymer, (b) a polymeric polyamine, and (c) an oil-soluble sulfonic acid.
    Type: Grant
    Filed: April 21, 1978
    Date of Patent: January 8, 1980
    Assignee: Phillips Petroleum Company
    Inventor: Kenneth W. Willcox
  • Patent number: 4173696
    Abstract: A novel and improved method for polymerizing a vinyl monomer in a polymerization reactor is provided. The inner walls of the polymerization reactor and other surfaces coming into contact with the monomer are coated with an aqueous liquid containing at least one alkali metal or ammonium salt of an anionic dye of the sulfonic carboxylic acid form and having a pH value adjusted not to exceed 7 by aid of a pH adjusting agent, and the thus coated surfaces are dried with heat before the polymerization is conducted. The method serves to greatly reduce the deposition of polymer scale on those surfaces and, consequently, improve the productivity as well as the quality of polymer product.
    Type: Grant
    Filed: January 23, 1978
    Date of Patent: November 6, 1979
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Shunichi Koyanagi, Niichiro Hasegawa, Toshihide Shimizu, Sensaku Katusima, Ichiro Kaneko
  • Patent number: 4170589
    Abstract: An improved method for preparing ethylene polymers with certain supported chromium [II] catalysts wherein the improvement comprises employing said catalyst in the presence of phenolic antioxidant.
    Type: Grant
    Filed: February 22, 1978
    Date of Patent: October 9, 1979
    Assignee: Union Carbide Corporation
    Inventors: George L. Goeke, Anthony D. Hamer, Frederick J. Karol
  • Patent number: 4169925
    Abstract: A process for the manufacture of olefin polymers by polymerizing .alpha.-monoolefins at relatively low temperatures and relatively low olefin pressures by means of a catalyst obtained from a silicate carrier (component a), an aluminum compound (component b) and a chromium compound (component c). The catalyst is obtained by (1) in a first stage, initially (1.1) charging a particular silicate carrier (component a) with (1.2) a mixture of (1.2.1) an aluminum salt or a mixture of an aluminum salt with up to 80 mole%, based on the salt mixture, of a nickel-II salt (component b) and (1.2.2) a chromium compound (component c), this compound being chromium trioxide or a compound which is converted to chromium trioxide under the conditions of stage (2), by treatment with a solution of the mixture (1.2), and (2), in a second stage then maintaining the product, obtained from stage (1), for a certain time at a high temperature in an anhydrous oxygen-containing gas stream.
    Type: Grant
    Filed: April 28, 1978
    Date of Patent: October 2, 1979
    Assignee: BASF Aktiengesellschaft
    Inventors: Wolfgang Gruber, Hans Frielingsdorf, Robert Bachl, Guenther Schweier
  • Patent number: 4169929
    Abstract: A process for the continuous high pressure polymerization of ethylene in a polymerization system which comprises a polymerization zone (A), a high pressure product isolation zone (B), a throttling and control system (C), a low pressure product isolation zone (D), a second throttling and control system (E) and a discharge extruder (F), and wherein, according to the invention, the level of the ethylene polymer in the high pressure product isolation zone (B) and in the low pressure product isolation zone (D) is varied periodically. The process gives an ethylene polymer of improved homogeneity, which when used to manufacture films does not tend to form specks or fisheyes.
    Type: Grant
    Filed: May 3, 1978
    Date of Patent: October 2, 1979
    Assignee: BASF Aktiengesellschaft
    Inventors: Oskar Buechner, Volker Gierth
  • Patent number: 4169926
    Abstract: Inorganic hydrogels, e.g., silica-containing hydrogels, are contacted with contacting agents comprising oxygen-containing organic compounds and then dried to remove the liquid components therefrom. The contacting agent can also be an oxygen-containing organic compound in combination with a liquid hydrocarbon or an oxygen-containing compound in combination with a liquid hydrocarbon and a surfactant. The hydrogel can be treated with a catalytic metal compound prior to or during the contacting with the contacting agents in order to produce a composition after drying and calcining that is catalytically active for olefin polymerization. The treated hydrogel can also, after drying, be treated anhydrously with a catalytic metal compound to produce a composition that is active for 1-olefin polymerization upon calcination.
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: October 2, 1979
    Assignee: Phillips Petroleum Company
    Inventor: Max P. McDaniel
  • Patent number: 4168356
    Abstract: A process and apparatus for the polymerization of ethylene in at least one multizone reactor at a pressure of 300 to 2500 bars and at a temperature of 150 to 350.degree. C. The reaction mixture is passed from the reactor to a separator at a pressure of 50 to 500 bars in which the polymer separates from the gas. The polymer is then passed to a hopper at a pressure of 1 to 20 bars in which the major part of the gas remaining dissolved in the polymer is removed. The gas from the separator is recompressed and is returned only to the first zone of the reactor.
    Type: Grant
    Filed: March 29, 1978
    Date of Patent: September 18, 1979
    Assignee: Societe Chimique des Charbonnages-CdF Chimie
    Inventors: Bernard Levresse, Robert Fonmartin
  • Patent number: 4168355
    Abstract: A continuous process for producing polyethylene or copolymers of ethylene with other copolymerizable compounds at a pressure of at least 1,000 kg/cm.sup.2 in a tubular reactor under steady conditions without imposing on the polymerization system flow pulses, while keeping the monomer conversion at 35% or lower and the melt index of the polymer at 0.1 or more.
    Type: Grant
    Filed: March 17, 1975
    Date of Patent: September 18, 1979
    Assignee: Sumitomo Chemical Company Limited
    Inventors: Ryuichi Sonoda, Mitsuru Tamura, Hikaru Nagashima
  • Patent number: 4167615
    Abstract: Hydrocarbon-soluble compositions useful as the transition metal component in the Ziegler polymerization of .alpha.-olefins are provided by reacting molecular nitrogen or hydrogen with a transition metal compound such as titanium trichloride to form a dinitrogen or dihydrogen complex of the transition metal compound.
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: September 11, 1979
    Assignee: The Dow Chemical Company
    Inventors: Donald E. Gessell, Kirby Lowery, Jr.
  • Patent number: 4166167
    Abstract: Gas-phase polymerization of an .alpha.-olefin, especially propylene, in a stirred or fluidized bed of substantially uniform and approximately spherical carrier particles of an .alpha.-olefin polymer of diameter 100-500 .mu.m, using a catalyst comprising an organo-metallic compound and a solid transition metal compound which has a particle size of less than 5 .mu.m, produces a propylene polymer having unexpectedly good powder flow characteristics. The transition metal compound is conveniently a titanium trichloride-containing material which has been treated with a dialkyl ether solution.
    Type: Grant
    Filed: June 20, 1977
    Date of Patent: August 28, 1979
    Assignee: Imperial Chemical Industries Limited
    Inventors: Ashley D. Bye, John E. Priddle, Victor A. Wilson
  • Patent number: 4166081
    Abstract: Graft copolymers of resin-forming monomers on monoolefin-type rubber spines, particularly ethylene-propylene-non-conjugated diene rubber spines, are made in solution with the aid of a free radical polymerization initiator. The graft copolymers have high impact strength.
    Type: Grant
    Filed: December 5, 1977
    Date of Patent: August 28, 1979
    Assignee: Uniroyal, Inc.
    Inventors: Albert A. Fournier, Jr., Charles F. Paddock
  • Patent number: 4161574
    Abstract: A polypropylene having a strongly reduced melting temperature and improved optical properties is obtained by copolymerization of propylene with small quantities of ethylene and butene-(1).
    Type: Grant
    Filed: August 22, 1977
    Date of Patent: July 17, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Helmut Strametz, Kurt Rust
  • Patent number: 4158571
    Abstract: Bingham fluid compositions are provided which contain a functional material such as a polymerization initiator dispersed in a solid continuous phase, which is a mixture of a wax and a liquid hydrocarbon. Such compositions are prepared by heating the wax and the liquid hydrocarbon to form a melt and dispersing the functional material in the melt. Upon cooling, the composition solidifies with the functional material being uniformly dispersed throughout the continuous solid phase. The compositions, while solid at ambient temperature and pressure, assume the flow characteristics of a liquid under an applied pressure and can be pumped to feed the functional material to a polymerization reactor or molten polymer on a continuous basis.
    Type: Grant
    Filed: May 19, 1978
    Date of Patent: June 19, 1979
    Assignee: Gulf Oil Corporation
    Inventors: Thomas J. Lynch, Robert J. Rowatt
  • Patent number: 4157362
    Abstract: Ethylene-vinyl acetate copolymers are carboxylated by copolymerizing an alpha, beta-unsaturated carboxylic acid and/or anhydride thereof with at least one vinylidene monomer having the formula: ##STR1## wherein X and Y can be the same or different, and each represents hydrogen, chlorine, alkyl, acetoxy, carboxylic acid ester group or cyano; with an ethylene-vinyl acetate copolymer in the presence of a polymerization initiator in a reaction medium of a ketone compound or a mixture of a ketone compound and an acetic acid ester, wherein the reaction is conducted in a heterogeneous state.
    Type: Grant
    Filed: March 16, 1978
    Date of Patent: June 5, 1979
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Nobuo Morishita, Mitsutaka Saito
  • Patent number: 4155954
    Abstract: An improved process for grafting vinyl chloride onto ethylene-vinyl acetate or ethylene-alkyl acrylate copolymers in the gel phase in the presence of radical formers soluble in the monomer wherein the ethylene-vinyl acetate or ethylene-alkyl acrylate copolymer is in powder form and a combination of at least two initiators having different decomposition temperatures are employed during the grafting, the resultant grafted copolymer and the use of the same as an impact strength improving component or polyvinyl chloride or vinyl chloride copolymers.
    Type: Grant
    Filed: May 23, 1977
    Date of Patent: May 22, 1979
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Robert Buning, Kurt Huhn, Rudolf Rasche
  • Patent number: 4155899
    Abstract: An improved polyvinyl halide or a polyvinyl halide copolymer containing up to 50 percent of a comonomer can be obtained by post polymerizing in a single stage or two-stage bulk process in contact with a base polymer, the same or different monomer as the monomer used to form the base polymer. Compositions produced by the process of the invention are useful in making films, coated fabrics and molded objects. The liquid phase post polymerization process of the invention is applicable to base polymers in powder form prepared by emulsion, suspension and bulk polymerization processes. The base polymer can be present in a polymerization mixture in which only a partial amount of monomer has been converted to base polymer such as in a two-stage polymerization process or the base polymer can be used in dry, solid form. Polymers of the invention have improved bulk density and reduced plasticizer uptake and can be used to prepare fabric coatings.
    Type: Grant
    Filed: August 4, 1976
    Date of Patent: May 22, 1979
    Assignee: Hooker Chemicals & Plastics Corp.
    Inventors: Anthony L. Lemper, Gilbert Witschard, Victor A. Pattison
  • Patent number: RE30148
    Abstract: A melt finish process is disclosed herein for working up solid, particulate polymer from a vapor state polymerization reactor, which reactor employs high yield catalysts, whereby the polymer is moved out of the reactor and into a post polymerization zone characterized by essentially adiabatic polymerization and the heat of such polymerization is used in raising the temperature of and melting said solid, particulate polymer to form molten polymer for further processing.
    Type: Grant
    Filed: July 17, 1978
    Date of Patent: November 13, 1979
    Assignee: Standard Oil Company (Indiana)
    Inventors: James L. Jezl, Edwin F. Peters