Abstract: A catalyst composition for the polymerization of olefins is provided, comprising a transition metal precursor containing sulfur ligands and an activating co-catalyst.

Abstract: A method of halogenating a precursor to form a polymerization procatalyst is disclosed whereby a magnesium/transition metal-containing alkoxide complex precursor is contacted with a halogenating agent selected from alkylaluminum halide, TiX4, SiX4, BX3, and Br2, where halide and X are reach respectively a halogen, and when an alkylaluminum halide, TiX4, SiX4, BX3, and Br2 are used as the halogenating agent, they are used together or in combination in a multi-step halogenation. The procatalyst then can be converted to an olefin polymerization catalyst by contacting it with a cocatalyst and optionally a selectivity control agent, and used to polymerize olefins in high yield with desired properties.

Abstract: Catalysts for the production of alkylene oxide by the epoxidation of alkene with oxygen comprise a silver-containing support, and a sufficient amount of cobalt component to enhance at least one of activity and/or efficiency and/or stability as compared to a similar catalyst which does not contain cobalt component.

Abstract: The present invention teaches the use of particular soluble metallocene catalyst to produce stereo-regular polymers in gas phase polymerizations wherein the catalysts are fed into a particle lean zone in the react. The metallocenes catalysts are bridged bis-(substituted indenyl) compounds.

Abstract: A process is disclosed for removing particulate product from a fluidized bed reactor to optimize, within the constraints of the product removal cycle, conservation of gas in which the product is entrained. Data are compiled on the time required for equalizing pressure between product discharge tanks, and these data are used to determine the optimum times for various valves to be open. Product movement steps and equalization steps can be performed simultaneously.

Abstract: Processes are disclosed for the oxidation of alkanes such as, for example, propane, to form unsaturated carboxylic aldehydes and acids such as, for example, acrolein and acrylic acid. The processes utilize oxygen and recycle alkanes, e.g. propane, to the aldehyde reactor. The presence of the alkane-to-aldehyde reaction can enhance the efficiency of the processes.

Abstract: A process comprising: (i) providing a first polyethylene, prepared independently, having a melt index in the range of about 5 to about 3000 grams per 10 minutes and a density in the range of about 0.900 to about 0.975 gram per cubic centimeter and a second polyethylene, prepared independently, having a flow index in the range of about 0.01 to about 30 grams per 10 minutes and a density in the range of about 0.860 to about 0.940 gram per cubic centimeter, the weight ratio of the first polyethylene to the second polyethylene being in the range of about 75:25 to about 25:75; (ii) blending the first polyethylene with the second polyethylene; (iii) melting the blend; and, prior to extrusion or pelletizing, (iv) passing the molten blend through one or more active screens, in the case of two or more active screens, positioned in series, each active screen having a micron retention size in the range of about 2 to about 70, at a mass flux of about 5 to about 100 pounds per hour per square inch.

Abstract: This invention relates to processes for conducting equilibrium-limited reactions such as esterification and alcoholysis reactions, using a single reaction zone and an acid separation column containing a rectification zone and a stripping zone. The single reaction zone temperature and pressure are sufficient to crack heavies, e.g., Michael-Addition heavies, formed in or introduced into said single reaction zone and to vaporize at least a portion of the product upon production thereof. The rate of supply of withdrawn bottoms fraction from the acid separation column to the single reaction zone can be controlled and adjusted to provide stable and efficient operation of the acid separation column and single reaction zone.

Abstract: The liquid content of granular product removed from a fluidized bed polymerization reactor operating in the condensing mode is reduced or minimized by removing the product from a level in the fluidized bed which is about 0.21 to about 0.59 of its height while venting the product discharge tank to a point higher in the fluidized bed.

Abstract: Bimodal resin products are produced in a single reactor by using two bicomponent catalyst compositions, each having a high molecular weight and a low molecular weight component, in different ratios. The HMW/LMW split of the final resin product is controlled accurately by controlling the ratio of the feed of the two bicomponent catalyst compositions. Bimodal or polymodal effects are also achieved for properties or characteristics other than molecular weight. More complex results can be achieved with more than two components. The invention is applicable to a wide variety of polymer products, particularly polyolefins and polyethylene.

Abstract: The dynamic fluidized-bed level in an olefin polymerization reactor is determined by radar or ultrasound waves. Echoes are processed to take into account the turbulence caused by bubbles, which can be as large as four meters in diameter, bursting on the surface, expelling resin particles into the freeboard above the dynamic fluidized-bed level.

Abstract: A spray-dryable composition is provided, comprising a catalyst compound, an activator for the catalyst compound, and at least one compound selected from among siloxanes, polyethylene glycols and crown ethers, the composition optionally further comprising a filler. There are further provided a method of spray-drying such a composition, and polymerization processes which employ such spray-dried compositions.

Abstract: A composition comprising: (a) polyethylene; (b) as a stabilizer, (A) 1,6-hexanediamine, N,N′-bis(2,2,6,6-tetramethyl-4-piperidinyl)-polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with N-butyl-1-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine (CAS number 192268-64-7) or (B) poly[(6-morpholino-s-triazine-2,4-diyl) [2,2,6,6-tetramethyl-4-piperidyl)imino]-hexamethylene[(2,2,6,6-tetramethyl-4-piperidyl)imino]] (CAS number 082451-48-7); and (c) an organic peroxide.

Abstract: Polyethylene having a broad molecular weight distribution is extruded in pellet form using a pelletizing extruder having one or more zones essentially filled with the polyethylene and two or more zones partially filled with the polyethylene. The polyethylene is fed into the extruder at a temperature sufficient to melt the polyethylene, and a mixture of an inert gas and oxygen is fed into at least one partially filled zone of the extruder with the exception of the feed zone. The mixture contains about 1 to about 21% by volume oxygen based on the volume of the gas mixture.

Abstract: The partially condensed fluid recycle stream of a fluidized bed polyolefin reactor operating in the condensing mode is split into two portions by a stream splitter. In a preferred mode, the smaller stream from the splitter contains a higher ratio of liquid to gas than the larger stream. One portion of the split stream is injected below the fluidized bed and the other, preferably with enhanced liquid content, is injected into the fluidized bed at a level above the distributor plate, preferably above the product withdrawal level.

Abstract: Novel active catalyst compositions comprising a compound or mixture of compounds represented by the formula SbFXmY4−m a complex of such a compound or mixture of such compounds being represented by the formula R·SbFXmY4−m or a combination of such compounds and complexes where in each formula, X is an anionic moiety, Y is an anion or anions resulting from the deprotonation of an active hydrogen-containing compound(s), m is 0 to 3 and R is one or more active hydrogen containing compound acting as molecules of solvation. The catalyst compositions are useful to promote alkoxylation reactions.

Abstract: A conducting polymer composite including: (i) a phase I material consisting essentially of a polar copolymer of ethylene and an unsaturated ester having 4 to 20 carbon atoms, said copolymer having a crystallinity of 0 to about 30 percent as determined by differential scanning calorimetry analysis and having a melt viscosity &eegr;I; (ii) a phase II material having a crystallinity of 0 to about 30 percent as determined by differential scanning calorimetry analysis and having a melt viscosity &eegr;II, said phase II material consisting essentially of (A) a non-polar copolymer of ethylene, an alpha-olefin having 3 to 12 carbon atoms, and, optionally, a diene, or (B) a non-polar elastomer, either of which, when mixed with the phase I material, will not enter into a completely homogeneous state, but is compatible with the phase I material; and (iii) a conducting filler material dispersed in the phase I material and/or the phase II in an amount sufficient to be equal to or greater than the amount required to gen

Abstract: An expandable composition comprising: (A) about 60 to about 98 percent by weight of a polyolefin or mixture of polyolefins wherein the polyolefin or mixture has an &eegr;0 of less than about 9.0 kilopascal.seconds (kPa.s), a Jr greater than about 50×10−5/pascals (Pa), and an Ea greater than about 6.7 kilocalories per mole (kcal/mol); and (B) about 2 to about 40 percent by weight of a polyolefin or mixture of polyolefins having an nRSI greater than about 4.5, and no greater than about 19; or (C) a polyolefin or mixture of polyolefins wherein the polymer or mixture has an &eegr;0 of less than about 9.0 kilopascal.seconds, a Jr greater than about 50×10−5/pascals, an Ea greater than about 6.7 kilocalories/mole, and an nRSI greater than about 9.

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: A process for controlling the molecular weight (Mw) and molecular weight distribution (MWD) of polybutadiene polymerized in an otherwise gas phase process using a rare earth catalyst is provided.