Patents Examined by Edward J. Smith
  • Patent number: 5571877
    Abstract: Low or medium-density straight-chain ethylene polymers are prepared by copolymerising ethylene with a C.sub.4 -C.sub.6 alpha-olefin at elevated temperature and pressure in a tubular reactor and in the presence of a Ziegler-type catalyst comprising a trialkyl aluminium as co-catalyst and a solid component, the solid component being obtained:by spray-drying an ethanolic solution of magnesium chloride to obtain a solid substrate of magnesium chloride particles containing alcoholic hydroxyls,by reacting the substrate with titanium tetrachloride to form an activated substrate, andby reacting the activated substrate with an alkyl aluminium chloride to chlorinate the titanium and partially or completely reduce the titanium from the tetravalent to the trivalent state.
    Type: Grant
    Filed: May 8, 1995
    Date of Patent: November 5, 1996
    Assignee: Enichem Base S.p.A.
    Inventors: Mauro Mirra, Renzo Invernizzi, Francesco Masi, Antonio Bani
  • Patent number: 5565532
    Abstract: The invention disclosed herein includes a process for producing highly amorphous polypropylene and a highly amorphous polypropylene produced by this process comprising contacting propylene with (1) a catalyst comprising a titanium compound supported on a rare earth halide and (2) a metal alkyl cocatalyst wherein the metal is selected from the group consisting of groups II and III of the Periodic Table under conditions for producing a highly stereo- and regio-irregular amorphous propylene polymer.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: October 15, 1996
    Assignee: Dureco Chemicals, Inc.
    Inventors: Vincenzo Busico, Wigi De Martino
  • Patent number: 5556893
    Abstract: Catalyst support containing an .alpha.-olefin polymer which is in the form of particles of mean size from 5 to 350 .mu.m in which the pore volume generated by the pores of radius from 1,000 to 75,000 .ANG. is at least 0.2 cm.sup.3 /g.Catalyst usable for the polymerization of .alpha.-olefins, including a compound containing at least one transition metal belonging to groups IIIb, IVb, IVb and VIb of the Periodic Table, bound in or on this support.
    Type: Grant
    Filed: May 24, 1994
    Date of Patent: September 17, 1996
    Assignee: Solvay (Soci et e Anonyme)
    Inventors: Jean-Louis Costa, Vincent Laurent, Philippe Francois, Dirk Vercammen
  • Patent number: 5543377
    Abstract: An olefin polymerization catalyst of the present invention comprises (A) a metallocene compound, (B) an organoaluminum oxy compound, and (C) at least one kind of carbonyl-containing compound selected from ketoalcohol and .beta.-diketone, and optionally (D) an organoaluminum compound, and therefore, the catalyst is excellent in polymerization activity per catalyst unit weight, and is capable of giving olefin (co)polymers having high molecular weight.A supported olefin polymerization catalyst and its olefin prepolymerized catalyst of the present invention are excellent in polymerization activity per catalyst unit weight, and is capable of giving olefin (co)polymers having uniform particle size.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: August 6, 1996
    Assignee: Mitsui Petrochemical Industries Co., Ltd.
    Inventors: Toshiyuki Tsutsui, Ken Yoshitsugu
  • Patent number: 5539067
    Abstract: Disclosed are catalysts for the polymerization of alpha-olefins which comprise the reaction product of:(a) an Al alkyl compound;(b) a silicon compound containing at least a Si--OR or Si--OCOR or Si--NR.sub.2 bond, R being a hydrocarbyl radical;(c) a solid comprising, as essential support, a Mg dihalide in active form and, supported thereon, a Ti halide or a halo-Ti-alcoholate and a particular, selected type of electron-donor compound.
    Type: Grant
    Filed: May 12, 1995
    Date of Patent: July 23, 1996
    Assignee: Montedison S.p.A.
    Inventors: Sandro Parodi, Roberto Nocci, Umberto Giannini, Pier C. Barbe', Umerto Scata'
  • Patent number: 5539069
    Abstract: An olefin polymerization catalyst of the present invention comprises (A) a metallocene compound, (B) an organoaluminum oxy compound, and (C) at least one kind of carbonyl-containing compound selected from ketoalcohol and .beta.-diketone, and optionally (D) an organoaluminum compound, and therefore, the catalyst is excellent in polymerization activity per catalyst unit weight, and is capable of giving olefin (co)polymers having high molecular weight.A supported olefin polymerization catalyst and its olefin prepolymerized catalyst of the present invention are excellent in polymerization activity per catalyst unit weight, and is capable of giving olefin (co)polymers having uniform particle size.
    Type: Grant
    Filed: August 9, 1994
    Date of Patent: July 23, 1996
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Toshiyuki Tsutsui, Ken Yoshitsugu
  • Patent number: 5532325
    Abstract: A process for producing polypropylene is provided which comprises polymerizing propylene in multiple stages, in the presence of a catalyst which is prepared by reacting a first organoaluminum compound (i), or a reaction product (vi) formed between the first organoaluminum compound (i) and an electron donor (a), with titanium tetrachloride (c) to obtain a first solid product (ii), reacting the resulting first solid product (ii) with the electron donor (a) and an electron acceptor (b) to obtain a second solid product (iii), and combining the resulting second solid product (iii) with a second organoaluminum compound (iv) and an aromatic carboxylic acid ester (v) at a molar ratio of the aromatic carboxylic acid ester to the second solid product (v/iii molar ratio) of from 0.1 to 10.
    Type: Grant
    Filed: October 19, 1995
    Date of Patent: July 2, 1996
    Assignee: Chisso Corporation
    Inventors: Takahiro Oka, Hiromasa Chiba
  • Patent number: 5527751
    Abstract: A polymerization catalyst comprising a reaction product of an organic rare earth metal compound of the formula (I),Cp.sub.a Lx.sub.b M.sub.c D.sub.d (I)(wherein in the formula (I), Cp is a substituted or unsubstituted cyclopentadienyl group, indenyl group, fluorenyl group or their derivatives, or a multidentate coordination compound residue obtained by bonding these groups by way of hydrocarbon or silicon,L is a metal selected from the group consisting of elements having an atomic number of 39 and 57-71,X is a halogen atom,M is an alkaline metal or alkaline earth metal,D is an electron donor,a is 1-2,b is 1-2,c is 0-1, andd is 0-3) with a Grignard reagent of the formula (II),RMgX (II)wherein in the formula (II), R is a hydrocarbon group, and X is a halogen atom); a method for producing a polyolefin or an olefin block copolymer by using the above-mentioned catalyst; and an olefin block copolymer produced by the above-mentioned method.
    Type: Grant
    Filed: June 27, 1994
    Date of Patent: June 18, 1996
    Assignee: Maruzen Petrochemical Co., Ltd.
    Inventors: Kunihiro Inamatsu, Tsuyoshi Matsumoto, Kazuo Soga
  • Patent number: 5525690
    Abstract: A process for the preparation of a polyolefin by polymerization of at least one olefin, the said process comprising contacting the at least one olefin with a catalytic system comprising a metallocene and a cocatalyst, wherein the metallocene is selected from the group consisting of rac-2,2-dimethylpropylidene(1-.eta..sup.5 -cyclopentadienyl)(1-,.eta..sup.5 -fluorenyl)dichlorometallocene of titanium, zirconium, hafnium and vanadium.Syndiotactic polypropylene having a melting temperature T.sub.m from 95.degree. to 160.degree. C., a syndiotactic pentad fraction [rrrr] from 0,91 to 0,96, a crystalline fraction f.sub.C from 25 to 50% and a viscosity-average molecular weight M.sub.v from 60,000 to 200,000.
    Type: Grant
    Filed: August 5, 1994
    Date of Patent: June 11, 1996
    Assignee: Solvay (Societe Anonyme)
    Inventors: James C. W. Chien, Marvin D. Rausch
  • Patent number: 5521135
    Abstract: A solid component of catalyst for the (co)polymerization of ethylene is composed of a silica carrier and a catalytically active part including titanium, magnesium, chlorine and alkoxylic groups and is obtained: by suspending an activated silica in a solution of magnesium chloride and titanium tetraalcoholate in a liquid aliphatic acid ester; eliminating the aliphatic acid ester from the resulting suspension to recover a solid; and making this solid react with an aluminium alkyl chloride. It is preferable to add also some measured quantities of a silicon halide to the solution in aliphatic acid ester.
    Type: Grant
    Filed: December 14, 1993
    Date of Patent: May 28, 1996
    Assignee: ECP Enichem Polimeri s.r.l.
    Inventors: Luciano Luciani, Maddalena Pondrelli, Renzo Invernizzi, Italo Borghi
  • Patent number: 5516866
    Abstract: Novel crystalline copolymers of propylene with minor proportions of ethylene and/or alpha-olefins, endowed with very good mechanical properties, a low melting point and a limited solubility in xylene at 25.degree. C., and the process for preparing them by means of the polymerization of mixtures of propylene with ethylene and/or alpha-olefins of suitable composition, by using catalysts obtained from stereorigid and chiral compounds of zirconium, and methylalumoxanic compounds.
    Type: Grant
    Filed: July 25, 1994
    Date of Patent: May 14, 1996
    Assignee: Montell Technology Company bv
    Inventors: Luigi Resconi, Enrico Albizzati, Romano Mazzocchi
  • Patent number: 5502125
    Abstract: An olefin copolymer is prepared by copolymerizing ethylene, an .alpha.-olefin and, optionally a diene having non-conjugated double bonds by solution polymerization in the presence of:(a) an organoaluminum compound,(b) a vanadium compound in the oxidation state from +3 to +5, and(c) an activator in a molar ratio of from 0.5 to 100 relative to vanadium of said vanadium compound, and an activator of a 2-halomalonic ester substituted by an aromatic group and having the formula ##STR1## wherein X=F, Cl, Br or I, Ar is an aromatic radical which is unsubstituted, monosubstituted or polysubstituted by alkyl or alkoxy groups and which is bound to the central carbon atom either directly or by an intervening carbonyl group; and R.sub.1 and R.sub.2 are hydrocarbon radicals having from 1 to 20 carbon atoms.
    Type: Grant
    Filed: March 10, 1995
    Date of Patent: March 26, 1996
    Assignee: Huels Aktiengesellschaft
    Inventors: Radu Bordeianu, Christoph Theis
  • Patent number: 5496781
    Abstract: In accordance with the present invention, there is provided catalyst systems and processes for preparing such catalyst systems comprising reacting a metallocene compound, a solid organoaluminoxy product, and an organometal compound. Further there is provided processes for the polymerization of olefins using the catalyst systems.
    Type: Grant
    Filed: May 16, 1994
    Date of Patent: March 5, 1996
    Assignee: Phillips Petroleum Company
    Inventors: Rolf L. Geerts, Syriac J. Palackal, Ted M. Pettijohn, Robert M. Infield
  • Patent number: 5491205
    Abstract: Polymers of C.sub.2 -C.sub.10 -alk-1-enes are prepared at from 0.5 to 3000 bar and from -50.degree. to 300.degree. C. using a catalyst system by a process in which the catalyst system used is one which contains, as active components:a) a metallocene complex of the general formula I ##STR1## where M is titanium, zirconium, hafnium, vanadium, niobium or tantalum,X is fluorine, chlorine, bromine, iodine, hydrogen, C.sub.1 -C.sub.10 -alkyl, C.sub.6 -C.sub.15 -aryl or --OR.sup.7,R.sup.7 is C.sub.1 -C.sub.10 -alkyl, C.sub.6 -C.sub.15 -aryl, alkylaryl, arylalkyl, fluoroalkyl or fluoraryl, where each alkyl radical is of 1 to 10 carbon atoms and each aryl radical is of 6 to 20 carbon atoms,R.sup.1 to R.sup.6 are each hydrogen, C.sub.1 -C.sub.10 -alkyl, 5-membered to 7-membered cycloalkyl, which in turn may carry C.sub.1 -C.sub.10 -alkyl radicals as substituents, C.sub.6 -C.sub.15 -aryl or arylalkyl, where two adjacent radicals together may furthermore be a cyclic group of 4 to 15, carbon atoms, or Si(R.sup.8).sub.3R.
    Type: Grant
    Filed: October 28, 1994
    Date of Patent: February 13, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Langhauser, Jurgen Kerth, Gunther Schweier, Hans-Herbert Brintzinger, Stefan Mansel, Werner Roell, Robin Kirsten
  • Patent number: 5491208
    Abstract: In an improved process for producing elastomeric ethylene-propylene copolymers with a propylene content comprised within the range of from 22 to 38% by weight and a content of residual chlorine, coming from the co-catalyst, lower than 300 parts per million parts, the polymerization is carried out in suspension in the monomers in the liquid state, with vanadium triacetylacetonate and alkyl-Al compounds, and the obtained polymer is recovered without any washing steps.
    Type: Grant
    Filed: March 31, 1994
    Date of Patent: February 13, 1996
    Assignee: Enichem Elastomeri S.r.l.
    Inventors: Tiziano Tanaglia, Viviano Banzi, Elisa Zecchi
  • Patent number: 5489634
    Abstract: A method for producing a stereospecific polyolefin in the presence of a catalyst comprising a transition metal compound and an organometallic compound, wherein a catalyst system is used which comprises (A) a solid catalyst component prepared by reacting a homogeneous solution containing (i) at least one member selected from the group consisting of metal magnesium and a hydroxylated organic compound, and oxygen-containing organic compounds of magnesium, (ii) an oxygen-containing organic compound of aluminum and (iii) an oxygen-containing organic compound of titanium, with (iv) at least one aluminum halide compound to obtain a solid product, and further reacting to this solid product, (v) an electron-donative compound and (vi) a titanium halide compound, (B) at least one member selected from the group consisting of organometallic compounds of Groups IA, IIA, IIB, IIIB and IVB of the Periodic Table, and (C) an oxygen-containing organic compound of silicon which has no aromatic substituent and which has at least
    Type: Grant
    Filed: July 27, 1994
    Date of Patent: February 6, 1996
    Assignee: Tosoh Corporation
    Inventors: Daiji Hara, Morihiko Sato, Mitsuhiro Mori
  • Patent number: 5476914
    Abstract: The invention provides for highly crystalline syndiotactic polypropylene comprising a high percentage of racemic (r) dyads. The high crystallinity may be due to the polymerization mechanism of metallocene catalysts of a particular structure which appear to produce syndiotactic polypropylene of a new microstructure.
    Type: Grant
    Filed: March 20, 1992
    Date of Patent: December 19, 1995
    Assignee: Fina Technology, Inc.
    Inventors: John A. Ewen, Abbas Razavi
  • Patent number: 5473027
    Abstract: Disclosed is a process for making polyethylene resin by reacting ethylene or ethylene and a C.sub.3 -C.sub.8 alpha-olefin in the presence of a CrO.sub.3 /TiO.sub.2 catalyst on a silica support in a gas-phase polymerization reactor and in the presence of a catalyst productivity reduction agent such as oxygen. The resin in one embodiment has a melt flow ratio between 65 and 140 and a melt index between 0.1 and 0.6 g/10 min. The resin is particularly suitable for use in blow-molding applications.
    Type: Grant
    Filed: June 9, 1994
    Date of Patent: December 5, 1995
    Assignee: Chevron Chemical Company
    Inventors: Robert L. Batchelor, Gene E. Kellum
  • Patent number: 5457171
    Abstract: Catalyst systems for the polymerization of C.sub.2 -C.sub.10 -alkenes contain, as active components, a metallocene complex of a metal of subgroup IV or V of the Periodic Table, an oligomeric alumina compound and a cyclic boron compound of the general formula IV ##STR1## where R.sup.18 to R.sup.20 are each C.sub.1 -C.sub.10 -alkyl which may be monosubstituted to trisubstituted by halogen, C.sub.6 -C.sub.15 -aryl or C.sub.1 -C.sub.10 -alkoxy,C.sub.4 -C.sub.7 -cycloalkyl which may be monosubstituted to trisubstituted by halogen, C.sub.1 -C.sub.10 -alkyl or C.sub.1 -C.sub.10 -alkoxy,C.sub.1 -C.sub.10 -alkoxy which may be monosubstituted to trisubstituted by halogen, C.sub.1 -C.sub.10 -alkyl or C.sub.6 -C.sub.15 -aryl, or C.sub.6 -C.sub.15 -aryl which may be monosubstituted to pentasubstituted by halogen, C.sub.1 -C.sub.10 -alkyl or C.sub.1 -C.sub.10 -alkoxy.
    Type: Grant
    Filed: August 3, 1994
    Date of Patent: October 10, 1995
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Langhauser, Martin Lux, Rolf Muelhaupt, David Fischer
  • Patent number: RE35289
    Abstract: A process for production of styrene polymers of high syndiotactic configuration is disclosed, comprising polymerizing styrene or styrene derivatives by the use of a catalyst comprising: (A) a titanium compound, e.g., at least one compound selected from those represented by the formulae: TiR.sup.1.sub.a R.sup.2.sub.b R.sup.3.sub.c X.sup.1.sub.4 -(a+b+c) and TiR.sup.1.sub.d R.sup.2.sub.e X.sup.1.sub.3-(d+e) (all the symbols are as defined in the appended claims); and (B) a contact product of an organoaluminum compound and a condensation agent, e.g., a product resulting from modification of trimethylaluminum with water. Because of such high syndiotactic configuration, the styrene polymers are greater in thermal resistance and solvent resistance than conventional atactic polystyrene.
    Type: Grant
    Filed: June 1, 1993
    Date of Patent: July 2, 1996
    Assignee: Idemitsu Kosan Company Limited
    Inventors: Nobuhide Ishihara, Masahiko Kuramoto, Michitake Uoi