Abstract:
Metal complexes useful as olefin polymerization catalysts corresponding to formula (I), wherein L is a delocalized, pi -bonded group that is bound to M, containing up to 50 nonhydrogen atoms; M is a metal of Group 3, 4 or the Lanthanide series of the Periodic Table of the Elements; Z is a covalently bound, divalent substituent of up to 50 non-hydrogen atoms having the formula: -(ER2)m-, wherein E independently each occurrence is carbon, silicon or germanium, R independently each occurrence is selected from the group consisting of C1-20 hydrocarbyl, and C1-20 hydrocarbyloxy, with the proviso that in at least one occurrence R is C1-20 hydrocarbyloxy, and m is an integer from 1 to 3; Y is a divalent ligand group comprising nitrogen, phosphorus, oxygen or sulfur, said Y containing up to 20 nonhydrogen atoms; X' is a neutral Lewis base ligand having up to 20 non-hydrogen atoms; X'' independently each occurrence is a monovalent, anionic moiety selected from hydride, halo, hydrocarbyl, silyl, germyl, hydrocarbyloxy, amide, siloxy, halohydrocarbyl, halosilyl, silylhydrocarbyl, and aminohydrocarbyl having up to 20 non-hydrogen atoms, or two X'' groups together form a divalent hydrocarbadiyl group; n is a number from 0 to 3; and p is an integer from 0 to 2.
Abstract:
Perfluoroaryl-substituted compounds are prepared from perfluoroaryl compounds, particularly tris pentafluorophenyl borane is prepared from hexafluorobenzene. The method comprises contacting a perfluoroaryl compound with an organomagnesium reagent in the presence of a catalyst to form a perfluoroaryl magnesium compound, and contacting the perfluoroaryl magnesium compound with a trihalide element to form a tris perfluoroaryl-substituted compound.
Abstract:
An electrochemical fuel cell having a membrane electrode assembly (1) and a flow field (4) adjacent thereto wherein the flow field comprises an electrically conductive porous material having a porosity of at least 50 percent and a mean pore size of at least 35 microns. This fuel cell is able to operate at relatively high current densities and relatively high voltages at reduced gas flow rates.
Abstract:
An environmentally friendly polymer film pouch (10) made from a polyethylene film structure for the packaging of flowable materials, for example, a pouch made from a monolayer or multilayer film structure (13) such as a two-layer or a three-layer coextruded film containing at least one layer of a blend of a substantially linear ethylene polymer and a high pressure low density polyethylene as a seal layer (12). Also disclosed is a process for making the pouch for packaging flowable materials using a film structure described hereinabove.
Abstract:
A monolayer or multilayer label filmstock having low haze while maintaining sufficient stiffness and die-cuttability to be used in a deformable, pressure-sensitive label. The low haze allows the deformable labels to be substantially clear. The label filmstock comprises a polymer blend of a polyolefin and a glassy polymer.
Abstract:
The present invention is a rigid thermoplastic polyurethane having a Tg of at least 50 DEG C having a sufficient concentration of units of an aromatic diol to lower the temperature at which the rigid thermoplastic polyurethane can be melt processed. The present invention is also a thermoplastic polyurethane with a flex modulus of at least 690,000 kPa (100,000 psi), and having a sufficient concentration of units of an aromatic diol to lower the temperature at which the thermoplastic polyurethane can be melt processed. The compositions of the present invention show improved processability with insubstantial loss of physical properties.
Abstract:
A transition metal carbide is formed from a precursor mixture comprising at least one of the group consisting of: a transition metal, a transition metal carbide and a transition metal oxide. The precursor mixture may contain the desired transition metal carbide (for example, WC), but if the desired transition metal carbide is present in the precursor mixture, there is necessarily a significant amount of another compound such as a transition metal oxide, undesired carbide (for example, W2C) or transition metal. The method involves forming an admixture by mixing the precursor mixture with a sufficient amount of carbon to carburize the precursor mixture to the transition metal carbide and reacting the admixture in an inert or reducing atmosphere at a temperature for a time sufficient to convert the admixture to the transition metal carbide, wherein the admixture is reacted in the presence of a means to enhance transfer of heat into the admixture, an inert or reducing gas flowing through at least a portion of the admixture or combination thereof.
Abstract:
The present invention describes a process to reduce the volume and/or weight of magnesium slag when the magnesium slag contains radioactive thorium. The process contacts the magnesium slag as an aqueous slurry with an acid in a pH range from about 4.0 to about 8.0, preferably from about 5.0 to about 5.5, followed by separating insoluble solids from the aqueous solution. Optionally, the acid digested solids are heated, either before or after the acid digestion, at a temperature from about 350 to about 500 DEG C. The solid waste can then be further compacted, if desired, prior to disposal.
Abstract:
Solutions comprising at least one polyamino disuccinic acid and one of more polyamino monosuccinic acids are useful in gas conditioning (preferably as the iron chelate). The copper chelates are also useful in electroless copper plating. Another aspect of the invention includes the use of the aminosuccinic acid mixtures in laundry detergent compositions.
Abstract:
Curable compositions contain: (a) at least one nitrile oxide monomer which contains on average more than one stable nitrile oxide group per molecule; and (b) at least one polyunsaturated monomer which: (1) has a weight average molecular weight of no more than 5000; and (2) contains on average more than one insaturated moiety which contains a sterically-unhindered carbon-carbon or carbon-nitrogen double bond or triple bond. The monomers are selected such that either the nitrile oxide monomers or the polyunsaturated monomers or both contain on average more than two reactive groups per molecule, and such that the equivalent ratio of nitrile oxide to unsaturated moieties is more than 0.5:1 and less than 2:1. The compositions can be used in coatings, composites, laminates and injection moldings.