Abstract: Disclosed is an ethylenic copolymer having Mw/Mn, as measured through GPC, of from 1.5 to 4, Mw of from 3,000 to 1,000,000, and a resin density of from 0.85 and 0.95 g/cm3. The relationship between the half width at the half maximum [W/2] of the curve as obtained through Gaussian distribution approximation relative to the essential peak of the compositional distribution curve of the copolymer obtained through temperature rising elution fractionation analysis, and the average, n, of short-chain branches existing in the copolymer satisfies an equation, 0.704+0.147n ≦W/2≦−0.055+0.577n. Also disclosed is an ethylenic copolymer having Mw/Mn of from 1.5 to 4 and a resin density of from 0.85 and 0.95 g/cm3.

Abstract: This invention relates to propylene impact copolymer compositions. In particular, these unique and improved compositions can be produced using conventional, commercial-scale processes.

Abstract: A process for polymerization of an olefin comprising contacting one or more olefins, optionally in the presence of an inert aliphatic, alicyclic or aromatic hydrocarbon, with a catalyst system comprising a Group 3-10 metal complex, a dispersible clay catalyst activator comprising finely divided clay having a correlated settling rate less than 0.03 cm/sec, and from 0.001 to 10 mmol/g of clay of a Group 1 to 14 metal alkyl compound. The foregoing process is particularly adapted for use in the preparation of olefin polymers under solution polymerization conditions.

Abstract: Process for manufacturing olefin polymers, in which some of the suspension of olefin polymer particles formed in a diluent is drawn off from the polymerization reactor and diluted by means of a liquid before being sent into a hydrocyclone separator in which, on the one hand, a concentrated suspension of polymer particles and, on the other hand, a stream essentially comprising diluent are formed and separated.

Abstract: The invention comprises an olefin polymerization process comprising contacting ethylene alone or with one or more olefinically unsaturated comonomers with a Group 3-6 metallocene catalyst compound comprising one &pgr;-bonded ring having a C3 or greater hydrocarbyl, hydrocarbylsilyl or hydrocarbylgermyl substituent said substituent bonded to the ring through a primary carbon atom; and, where the compound contains two &pgr;-bonded rings, the total number of substituents on the rings is equal to a number from 3 to 10, said rings being asymmetrically substituted where the number of substituents is 3 or 4. The invention process is particularly suitable for preparing ethylene copolymers having an MIR less than about 35, while retaining narrow CD even at high comonomer incorporation rates, and with certain embodiments providing ethylene copolymers having improved melt strength with the low MIR.

Abstract: Propylene homopolymers or propylene-olefin copolymers, having at least one olefin selected from ethylene and &agr;-olefins having 4 or more carbon atoms where the propylene content in this copolymer is 98% by weight or more, are provided that are suitable for producing films with excellent antistatic performance, high rigidity and metallizability.

Abstract: The present invention is directed to improved drag reducing agents and methods of forming improved drag reducing agents comprising the steps of isomerizing olefin monomers to form isomerized olefin monomers, polymerizing the isomerized olefin monomers in the presence of at least one catalyst to form a polyolefin drag reducing agent having unexpectedly superior drag reduction properties when combined with liquid hydrocarbons, such as viscous crude oil. Therefore, the drag reducing agents of the present invention may be introduced into conduits, such as pipelines, to increase the flow of the hydrocarbons through the conduit.

Abstract: A polymer of ethylene and at least one alpha olefin having at least 5, carbon atoms obtainable by a continuous gas phase polymerization using supported catalyst of an activated molecularly discrete catalyst such as a metallocene in the substantial absence of an aluminum alkyl based scavenger which polymer has a Melt Index (MI) as herein defined of from 0.1 to 15; a Compositional Distribution Breadth Index (CDBI) as defined herein of at least 70%, a density of from 0.910 to 0.930 g/ml; a Haze value as herein defined of less than 20%; a Melt Index ratio (MIR) as herein defined of from 35 to 80; an averaged Modulus (M) as herein defined of from 20 000 to 60 000 psi (pounds per square inch) and a relation between M and the Dart Impact Strength in g/mil (DIS) complying with the formula: DIS≧0.8×[100+e(11.71-0.000268×M+2.183×10−9×M2)].

Abstract: An ethylene polymerization process is disclosed. The process uses a single-site catalyst that contains a boraaryl ligand. It comprises supporting the catalyst, forming a slurry of the supported catalyst in an organic solvent, mixing the catalyst slurry with trialkyl aluminum compound, and polymerizing ethylene in the presence of the trialkyl aluminum-treated catalyst slurry. The process gives polyethylene having a controlled long-chain-branch index.

Abstract: The present invention provides a method for producing a polyolefin composition having a narrow composition distribution and is characterized in that when at least two olefins are copolymerized in the presence of a transition metal compound catalyst using at least two gas phase fluidized bed reactors, a saturated aliphatic hydrocarbon is allowed to exist in each reactor in a concentration from 0.1 to 30 mol %, and the ratio of the concentration (C2) of a saturated aliphatic hydrocarbon in a reactor of a second stage to the concentration (C1) of a saturated aliphatic hydrocarbon in a reactor of a first stage (C2/C1) is 0.13 or more.

Abstract: Polyolefins, preferably polyethylene, are prepared in a continuous gas-phase polymerization process in which the fluid monomeric component, preferably ethylene, and, optionally, one or more comonomers is/are polymerized in the polymerization zone of a fluidized-bed reactor in the presence of one or more catalysts, optionally with the addition of various auxiliaries, under reaction conditions where the fluidizing gas is circulated to remove the heat of polymerization or reaction and the polymerization product is taken from the circuit and the corresponding amount of monomer and, optionally, comonomers and optionally further auxiliaries are fed in, wherein the fluidizing gas discharged from the fluidized-bed reactor is cooled by means of a direct cooling apparatus in which the coolant is brought into direct contact with the fluidizing gas and heated coolant is passed to at least one further cooling stage in order to cool it and is, after cooling, wholly or partly returned to the direct cooling apparatus and/or

Abstract: Ethylene based copolymers having high molecular weights, narrow molecular weight distributions, and a very good homogeneous distribution of the comonomer units can be obtained in high yields at temperatures of industrial interest, by carrying out the polymerization reaction in the presence of metallocene catalysts comprising particular bridged bis-indenyl compounds substituted in the 3-position on the indenyl groups.

Abstract: A method of making a sterile adhesive composition includes placing a mixture of a polymerizable adhesive monomer and a thickening agent in a container, sealing the container, and sterilizing the mixture and the container. The method provides superior viscosity for the monomer composition. An adhesive composition includes 2-octyl cyanoacrylate and at least one thickener. The sterile adhesive composition is particularly useful as a medical adhesive and can comprise 1,1-disubstituted ethylene monomers, such as &agr;-cyanoacrylates.

Abstract: The subject invention pertains to a non-pourable homogeneous ultra-low molecular weight ethylene polymer composition and a process for the preparation thereof. Such polymer compositions have longer lamella and a greater degree of crystalline organization than corresponding higher molecular weight materials at an equivalent density.

Abstract: &agr;-Olefins are polymerized in the gas phase at from 30 to 150° C. and a pressure of from 5 to 80 bar using a catalyst or a catalyst mixture containing as antistatic agent from 0.1 to 5% by weight of ZnO and/or anhydrous MgO, based on the total amount of the catalyst mixture, except for a process in which the catalyst mixture comprises a chromium catalyst and MgO-supported Ziegler catalyst which is modified with an alkene and with alkylaluminum hydride and also comprises free MgO and the total amount of the MgO is not less than 2% by weight of the catalyst mixture.

Abstract: New ligands, compositions, metal-ligand complexes and arrays with pyridyl-amine ligands are disclosed that catalyze the polymerization of monomers into polymers. Certain of these catalysts with hafnium metal centers have high performance characteristics, including higher comonomer incorporation into ethylene/olefin copolymers, where such olefins are for example, 1-octene, isobutylene or styrene. Certain of the catalysts are particularly effective at polymerizing propylene to high molecular weight isotactic polypropylene in a solution process at a variety of polymerization conditions.

Abstract: There are disclosed a catalyst for the polymerization of an olefin which comprises (A) a transition metal complex compound represented by the general formula (I) wherein the respective symbols are as defined in the specification, (B) a Lewis acid and/or an ionic compound capable of reacting with the transition metal complex compound of the component (A) or its derivative to form an ionic complex, and (C) an organic aluminum compound, and a process for preparing an olefin polymer in the presence of this catalyst. The catalyst of the present invention is inexpensive and has a high activity, and according to the present invention, the deterioration of the activity can be inhibited and the molecular weight of the obtained polymer can be easily adjusted, so that the olefin polymer can efficiently be prepared which has an optional molecular weight and can possess a molecular weight distribution in which low-molecular weight and high-molecular weight portions decrease.

Abstract: A propylene copolymer comprising propylene, at least one olefin selected from the group consisting of olefins having 2 to 20 carbon atoms except propylene, and a cyclic olefin, wherein the total number of carbon atoms of the monomers except the cyclic olefin is at least 7. This copolymer is mixed with a thermoplastic resin such as polypropylene to provide a thermoplastic resin composition having excellent flexibility, transparency, resistance to whitening on bending, scratch resistance and heat resistance.

Abstract: Blown films of linear low density polyethylene are produced by a high stalk process comprising extruding the linear low density polyethylene through an annular die to form an extruded tube of molten material, cooling the extruded tube while drawing the tube so cooled, to maintain the tube diameter identical to that of the annular die and expanding the tube or bubble to attenuate the walls thereof by introducing a gas to the interior of the tube or bubble. The resulting films are characterized by superior impact strength and MD tear resistance.

Abstract: A process for the gas-phase (co-)polymerisation of olefins in a fluidised bed reactor using a chromium oxide catalyst. The polymerisation is performed in the presence of a process aid additive.

Abstract: A process for the continuous gas-phase (co-)polymerization of olefins in a fluidized bed reactor using a Ziegler-Natta type catalyst. The polymerization is performed in the presence of a process aid additive.

Abstract: A solid self-supported cycloalkadienyl catalyst component is disclosed that includes: (i) a mixed metal alkoxide complex which is the reaction product of a magnesium alkoxide or aryloxide and at least one group IVB metal-containing alkoxide or aryloxide; and (ii) Cp, where Cp is a cyclic or polycyclic hydrocarbon having from 3-30 carbon atoms. A self-supported hybrid catalyst also is disclosed which contains the above components (i) and (ii), as well as (iii) a Ziegler-Natta catalyst species. A method of making the self-supported cycloalkadienyl catalyst and the self-supported hybrid catalyst and a method of polymerizing olefins using the catalysts also are disclosed. The catalysts are capable of producing polyolefins in high yield having a broad molecular weight distribution, or a bimodal distribution.

Abstract: Elastic fibers and fabrics made from homogeneously branched substantially linear ethylene polymers are disclosed which can be produced on conventional polypropylene or polyethylene fiber or fabric processes. They can be used to produce highly elastic structures that can have recycle compatibility between elastic and non-elastic components. The novel fibers have at least about 50% recovery at 100% strain. The fibers and fabrics are especially useful in making fabricated articles and components thereof (e.g., disposable diapers).

Abstract: Ethylene based copolymers having high molecular weights, narrow molecular weight distributions, and a very good homogeneous distribution of the comonomer units can be obtained in high yields at temperatures of industrial interest, by carrying out the polymerization reaction in the presence of metallocene catalysts comprising particular bridged bis-indenyl compounds substituted in the 3-position on the indenyl groups.

Abstract: A polyolefin resin composition comprising (A) an ethylene-based polyolefin having a density of 0.865 to 0.980 g/cm3 and MFR of 0.01 to 50 g/10 min, (B) a phosphorous compound, and (C) at least one heat stabilizer selected from the group consisting of a phenol-based heat stabilizer and a tocopherol-based heat stabilizer. The polyolefin resin composition has excellent heat resistance, moisture resistance and discoloration resistance, and also when used as a packaging material, does not impair the taste of contents to be packaged, such as flavor or odor, and therefore does not impair the taste of the contents.

Abstract: Metallocene catalysts useful for the preparation of syndiotactic/atactic block polyolefins have the general formula R″(C4R′mC5C4R′n)XMeQ wherein X is an hetero-atom ligand with one or two lone pair electrons selected from the elements of Group VA or VIA which can be substituted or non-substituted; (C4Rm′C5C4Rn′) is a fluorenyl or a symmetrically substituted fluorenyl or cyclopentadienyl ring; R′ is hydrogen or hydrocarbyl radical having from 1-20 carbon atoms, a halogen, an alkoxy, and alkoxy alkyl or an alkylamino or alkylsilylo radical, each R′ may be the same or different and m and n independently are 0, 1, 2, 3 or 4, with the proviso that the bilateraly symmetry is maintained; R″ is a structural bridge between X and the (C4R′mC5C4R′n) ring to impart stereorigidity; Q is a hydrocarbyl radical having 1-20 carbon atoms or is a halogen; Me is a Group IIIB, IVB, VB, or VIB metal as positioned in the Periodic Table of Elements; and Me can be in any o

Abstract: The present invention relates to a process for the preparation of rubber-like ethylene/&agr;-olefin copolymers and ethylene/&agr;-olefin/non-conjugate diene terpolymers using a metallocene as catalyst, which process is characterized in that the metallocene used is a compound of the general formula (I) 1

Abstract: The present invention relates to a Group 15 containing transition catalyst compound, a catalyst system and a supported catalyst system thereof and to a process for polymerizing olefin(s) utilizing them.

Abstract: A process for preparing aqueous polymer dispersions by means of a polymerization, conducted in an aqueous system, of at least one free-radically polymerisable ethylenically unsaturated monomer in the presence of a polymerisation initiator, wherein the pH of the aqueous dispersion is adjusted during the preparation process by adding at least two different, basic reagents, at least one of said basic reagents being added in a plurality of stages.

Abstract: A process for preparing pillared chromium phyllosilicate clay &agr;-olefin catalysts is disclosed This process utilizes palygorskite and sepiolite clays. The pillaring of said clays comprise the steps of: (a) preparing a hydrolyzed first solution by dissolving a chromium salt and a base in water, heating said first solution to a temperature in the range of about 20° C. to about 100° C. while stirring continuously until the solution reaches a pH in the range of about 1.5 to about 2.

Abstract: Fluorinated amine compounds, R′iArF-ER2, where ArF is a fluoroaryl substituent, E is nitrogen or phosphorous, each R is independently a C1-C20 hydrocarbyl substituent, or the two R's may be connected to form an unsubstituted or substituted C2-C20 cycloaliphatic substituent, R′ is a C1-C20 hydrocarbyl or halogenated hydrocarbyl, and i is 0, 1 or 2 are disclosed. These compounds may be protonated and complexed with suitable substantially noncoordinating anions to prepare polymerization catalyst components. When these catalyst components are combined with organometallic catalyst precursors, the catalyst precursor is activated to a catalyst. This catalyst is combined with monomer under olefin polymerization conditions to prepare polymer. High number-average molecular weight polymers at high productivity rates were observed from using metallocene catalysts activated with [N-pentafluorophenyl pyrrolidinium][tetrakis(pentafluorophenyl)borate].

Abstract: Disclosed is a polymetallic supported catalyst component comprising an activated anhydrous MgCl2 solid support which has been treated with at least one treatment of at least two halogen-containing transition metal compounds, wherein one is a halogen-containing titanium metal compound and one is a halogen-containing non-titanium transition metal compound, optionally, in the presence of an electron donor and the processes for producing the component. A catalyst for the polymerization of at least one alpha-olefin of the formula CH2═CHR, where R is H or a C1-12 branched or straight chain alkyl or substituted or unsubstituted cycloalkyl, by reacting this supported catalyst component with an organometallic cocatalyst, optionally in the presence of an electron donor, and the polymerization of at least one alpha-olefin with the catalyst are also disclosed.

Abstract: This invention relates to a polymer capable of forming an ultra-fine pattern with excellent rectangular shape in a silylated surface resolution process using a chemically amplified type resist composition as single layer or the most upper layer among multiple layers and to a resist composition using the polymer. The said polymer and resist composition are useful in a silylated surface resolution process, and by conducting the silylated surface resolution process using the said resist composition, contrast of silylation becomes higher and it becomes possible to obtain ultra-fine pattern regardless of the kind of exposure energy.

Abstract: The present invention provides ethylene polymers capable of preparing various molded articles such as films, sheets or the like, and having excellent moldability, particularly excellent high-speed moldability.

Abstract: A process for the gas phase polymerization of one or more alpha-olefins in the presence of a polymerization catalyst system under reactive conditions in a fluidized bed reactor which process comprises introducing into the reactor a deactivating agent characterized in that the deactivating agent is introduced close to the reactor wall and that said introduction does not terminate the polymerization reaction.

Abstract: Described are certain tetramethylcyclopentadienyl titanium compounds, catalyst systems comprising such compounds and an activator, and to a process using such catalyst systems for the production of polyolefins, particularly ethylene-&agr;-olefin copolymers having a high molecular weight and high level of &agr;-olefin incorporation.

Abstract: &pgr;-complex compounds and in particular metallocene compounds of formula (Ia)(Ib), in which &pgr;I and &pgr;II represent &pgr;-systems, D designates a donor atom and A designates an acceptor atom, D and A being linked by a reversible coordinative bond such that the donor group assumes a positive (partial) charge and the acceptor group assumes a negative (partial) charge, at least one of D and A being part of the associated &pgr;-system in each case, M stands for a transition metal of the 3rd, 4th, 5th or 6th subgroup of the (Mendelian) periodic system of elements, X designates an anion equivalent and n designates the number zero, one, two three or four depending on the charges of M and those of &pgr;I and &pgr;II, are novel and can be used as catalysts for the (co)polymerization of olefins, i-olefins, alkines and/or diolefins or for ring-opening polyaddition.

Abstract: The invention relates to a method to safely produce, handle and transport packaged organic peroxide formulations comprising a reactive phlegmatiser and to the use of such packaged material in polymerisation and polymer modification processes, particularly the high-pressure (co)polymerisation process of ethylene and/or the suspension (co)polymerisation process of styrene.

Abstract: A process for the gas-phase (co-)polymerisation of olefins in a fluidised bed reactor using a metallocene catalyst. The polymerisation is performed in the presence of a process aid additive.

Abstract: A process for producing high density polyethylene having a bimodal molecular weight distribution, the process comprising pre-contacting a chromium-based catalyst with an alkyl metal oxane, the chromium-based catalyst comprising chromium oxide on a silica-containing support, to form a catalyst system wherein the atomic ratio of the metal of the oxane to the chromium is less than 1, and polymerising ethylene or copolymerising ethylene and an alpha-olefinic comonomer comprising from 3 to 10 carbon atoms in the presence of the catalyst system. A catalyst system for polymerising ethylene or copolymerising ethylene and an alpha-olefinic comonomer comprising from 3 to 10 carbon atoms to produce high density polyethylene, the catalyst system comprising in combination a chromium-based catalyst comprising chromium oxide on a silica-containing support and an alkyl metal oxane with which the chromium-based catalyst has been precontacted whereby the atomic ratio of the metal of the oxane to the chromium is less than 1.

Abstract: A novel process for producing homopolymers and interpolymers of olefins which involves contacting an olefin and/or an olefin and at least one or more other olefin(s) under polymerization conditions with a Ziegler-Natta catalyst comprising at least one transition metal compound and at least one organometallic co-catalyst compound and tetrahydrofuran in amounts sufficient to reduce the electrostatic charge in the polymerization medium. Also disclosed is a process for reducing electrostatic charge in an olefin polymerization medium.

Abstract: Isoblock polymers of 1-olefins with a narrow molecular weight distribution are obtained when 1-olefins are polymerized using a catalyst consisting of a chiral metallocene, containing bridges, of formula I: and an aluminoxane. The polymers have rubber-like properties.

Abstract: A process for producing a polymer of an &agr;-olefin. The process includes polymerizing one or more &agr;-olefins having at least 4 carbon atoms in the presence of a catalyst for producing polymers of olefins. The catalyst contains (A) a specific metal compound and (B) either or both of (b-1) an organoaluminum oxy compound and (b-2) an ionic compound. The polymer of an &agr;-olefin is useful as a lubricant component.

Abstract: Olefins of the formula R11—CH═CH—R12 (R11, R12=H or C1-C14-alkyl) are polymerized in the presence of a catalyst consisting of at least one metallocene of the formula I (M=zirconium or hafnium) and an aluminoxane. Polymers having a high molecular weight are obtained in a high yield.

Abstract: A process for producing terpolymers of propylene, comprising a) feeding into a slurry reactor a reaction mixture containing 50-85 w- % of propylene, 1-10 w- % of ethylene, 15-40 w- % of another C4-C8 alpha-olefin, a catalyst system maintaining olefin polymerization at said temperature conditions, and optionally hydrogen, b) polymerizing said reaction mixture at a temperature of lower than 70° C. a sufficient time to obtain a propylene terpolymer amounting to 50-99 w- % of the end product, c) transferring said reaction mixture into a gas phase reactor operating at a pressure of higher than 5 bars, preferably higher than 10 bars, optionally adding 0-30 w- % of ethylene, 0-10 w- % of another C4-C8 alpha-olefin, 0-40 w- % of propylene and optionally hydrogen, and d) continuing polymerization in said gas phase reactor for obtaining a propylene terpolymer amounting to 1-50 wt- % of the end product. The terpolymer has a melting temperature a less than 135° C., preferably less than 132° C.

Abstract: A stereorigid metallocene compound contains, as ligands, an aryl-substituted cyclopentadienyl radical, linked via a hydrogen bridge, and a substituted or unsubstituted fluorenyl radical. The novel metallocene compound is suitable as a catalyst component for olefin polymerization.

Abstract: A method of multistage gas phase polymerization is provided comprising performing polymerization of a feed gas mixture at least containing ethylene gas, an &agr;-olefin gas and hydrogen gas in an upstream fluid bed reactor to thereby produce a polymer powder, recovering the thus-produced polymer powder and performing further polymerization of the polymer powder in a downstream fluid bed reactor, the downstream fluid bed reactor being continuously connected to the upstream fluid bed reactor so that the polymer powder recovered from the upstream fluid bed reactor is introduced into the downstream fluid bed reactor, which method comprises the steps of: recovering polymer powder from the upstream fluid bed reactor, treating the recovered polymer powder so as to lower the content of &agr;-olefin gas and hydrogen gas therein by contacting the polymer powder with a stream of gas comprising ethylene or an inert gas, and introducing the treated polymer powder into the downstream fluid bed reactor.

Abstract: A set of trim forward bins is utilized to set aside, distribute and allocate portions of granular product made in a continuous, usually fluidized bed, olefin polymerization reactor, to form blends which more efficiently utilize the products made during transitions from one set of specifications to another and/or to maintain a target property substantially continuously during steady state production of a single product.

Abstract: Petroleum resins are produced by using a supported halide based Lewis acid polymerization catalyst wherein the Lewis acid is chemically bound to the support and free hydrogen halide and/or alkane formed by the reaction of the Lewis acid with the support has been removed. The more active catalysts are useful with both pure monomer and mixed feeds.

Abstract: A process for preparing a butyl polymer having a weight average molecular weight of at least about 400,000. The process comprises the step of contacting a C4 to C8 monoolefin monomers with a C4 to C14 multiolefin monomer at a temperature in the range of from about −100° C. to about +50° C. in the presence of an aliphatic hydrocarbon diluent and a catalyst mixture comprising a major amount of a dialkylalumium halide, a minor amount of a monoalkylaluminum dihalide, and a minute amount of at least one of a member selected from the group comprising water, aluminoxane and mixtures thereof.