Abstract: Polyimides useful in multilayer electronic devices containing the 4,4'-bis(4-amino-2-trifluoromethylphenoxy) biphenyl moiety have low dielectric constants, low moisture uptake, high thermal degradation stability, low glass transition temperature.

Abstract: The present invention relates to a spent hydroprocessing catalyst regeneration process wherein the catalyst is subjected to an initial partial decoking step, followed by impregnation with a Group VIB metal-containing component, and then subjected to a final decoking step.

Abstract: Effective quenching is provided in a catalytic cracking unit to increase product yield and decrease thermal cracking. Advantageously, the quench is injected at special locations. In the illustrated embodiment, the quench is injected into the oil product immediately downstream of the oil product exit of an internal gross cut separator in a disengaging vessel.

Abstract: Layered, fiber-reinforced composites are toughened by the use of thermosetting matrix resins including polyphenylene ether particles. The method of the invention is particularly effective in improving the toughness of composites based on thermoset matrix resins.

Abstract: An aromatic alkylation process comprising continuously feeding catalyst particles through at least one substantially vertically-positioned permeable tube disposed in a vessel surrounding said permeable tube, contacting said catalyst particles with at least one aromatic hydrocarbon and at least one alkylating agent under liquid phase alkylation conditions, continuously removing said catalyst particles from a lower end of said tube, and recovering said alkyl-substituted aromatic.

Abstract: A process for the halogen-assisted conversion of lower alkanes to higher molecular weight hydrocarbons is provided. A first reaction mixture including lower alkanes, a hydrogen halide and an oxygen-containing gas are contacted with a catalytic composition of crystalline copper aluminum borate at appropriate reaction conditions to form an intermediate composition including halogenated alkanes. The halogenated alkanes are subsequently contacted with a catalytic composition of a pentasil molecular sieve material under appropriate reaction conditions to form a product mixture including hydrocarbons having molecular weights greater than the lower alkanes.

Abstract: A method for halogenating hydrocarbons wherein a reaction mixture including a hydrocarbon-containing feed, a hydrogen halide and an oxygen-containing gas is contacted at appropriate reaction conditions with a catalyst of copper aluminum borate to form halogenated hydrocarbons.

Abstract: This invention relates to a labyrinth seal comprising a first side in alignment with a radial axis and a second side opposite said first side, said first and said second side each including an inclined tooth, and an inner-axial surface in alignment with an axial axis and an outer-axial surface opposite said inner-axial surface having at least one hole extending to said inner-axial surface, said inner-axial surface including a plurality of teeth extending substantially inwardly toward the axial axis having grooves therebetween.

Abstract: A poly(aryl ether sulfone) blend comprising (a) from about 25 to about 99 percent by weight of a poly(biphenyl ether sulfone) and (b) from about 1 to about 75 percent by weight of a second poly(phenylene ether sulfone).

Abstract: Novel poly(aryl ether sulfone)-poly(aryl ether ketone) block copolymers are described. They are prepared by the nucleophilic polycondensation of a hydroxy- or halo-terminated poly(aryl ether ketone) oligomer with the poly(aryl ether sulfone) forming reagents; alternatively, a preformed poly(aryl ether sulfone) block may be used.The novel copolymers are tough materials with excellent heat, solvent, and stress-crack resistance. They display high HDT's (heat distortion temperatures) and are useful in molding, extrusion and composites applications.

Abstract: Epoxy resins containing epoxidized polybutenes and a process for preparing them are disclosed. The cured epoxy resin containing epoxidized polybutene demonstrates improved flexibility and ductility and improved chemical and water resistance with no loss in heat deflection temperature.

Abstract: A laser is characterized by a glass gain medium which contains trivalent samarium Sm.sup.3+ ions and which, when optically pumped on one or a number of absorption bands to achieve excitation at or above the metastable .sup.4 G.sub.5/2 level, radiates light at a wavelength substantially corresponding to transitions from the .sup.4 G.sub.5/2 level of samarium.

Abstract: Nucleic acid probes capable of specifically hybridizing to rRNA of E. coli and Shigella species and not to rRNA of non-E. coli/Shigella are described along with methods utilizing such probes for the specific detection of E. coli and/or Shigella in food and other samples.

Abstract: Described herein are miscible blends of polycarbonomides, defined as amide and/or imide containing polymers, and a polyarylate or arylate-carbonate copolymer which are useful in the manufacture of extruded sheets, high temperature connectors, aircraft and mass transportation vehicle interiors, injection molded articles, and extruded profiles and thermoformable articles.

Abstract: The preparation, structure, and properties of solid inorganic materials containing aluminum, boron, oxygen and at least one Group VIII metallo element, selected from the group consisting of cobalt and nickel is described. Also described in the use of such materials in catalytic compositions for the conversion of organic compounds. In particular, the new materials having the general formula:(x) (M.sub.m :M'.sub.n)O.(y)Al.sub.2 O.sub.3.(z)B.sub.2 O.sub.

Abstract: This invention encompasses diagnostic reagents comprising a polynucleic acid probe having a specific binding sequence and having one or more cytidines outside of the specific binding sequence. The polynucleic acid probe is bound to an amino functionalized solid support by a bisulfite mediated transamination between a cytidine and an amino group on the solid support. When the specific binding sequence contains cytidine, the cytidine is replaced with 5-methylcytidine which has essentially the same binding capacity and yet does not participate in transamination reactions. The invention encompasses compositions of the polynucleic acid probe as well as test kits including the above identified reagent and assays utilizing the above reagent. This invention is useful in detecting viruses, fungi and bacteria in test samples such as body fluids and food samples as well as detecting DNA or RNA sequences in mammalian cells.

Abstract: An improved process is disclosed for preparation of silicon-containing aromatic polyacids by liquid phase oxidation of a silyl compound in the presence of oxygen and a catalyst comprising cobalt-manganese-bromine. 2-Trimethylsilyl-p-xylene is oxidized to 2-trimethylsilyl-terephthalic acid; 5-trimethylsilyl-m-xylene is oxidized to 5-trimethylsilyl-isophthalic acid, 2,5-bis (trimethylsilyl)-p-xylene is oxidized to 2,5-bis (trimethylsilyl)-terephthalic acid; 5-trimethylsilyl-pseudocumene is oxidized to 1,2,4-tricarboxy-5-trimethylsilyl benzene; and 1,3-bis-(p-tolyl)-tetramethyl-disiloxane is oxidized to 1,3-bis(p-carboxyphenyl)-tetramethyl-disiloxane.

Abstract: A regiospecific, catalyzed process for preparing acyl derivatives of aromatic nitrogen-containing heterocyclic compounds in which the keto group is selectively added ortho to the nitrogen atom on the aromatic ring. In the presence of a ruthenium carbonyl compound, carbon monoxide and an olefin, the aromatic heterocyclic compound which has an unsubstituted carbon atom ortho to at least one of the heterocyclic atoms adds the acyl group essentially completely in ortho position.

Abstract: There is provided a process for the partial oxidation of a polymethylbenzene to the corresponding aromatic polycarboxylic acid, which process comprises contacting in a reaction zone said polymethylbenzene with molecular oxygen in the presence of an oxidation catalyst comprising at least one heavy-metal compound, said heavy-metal compound being acetate free, a source of bromine, and a non-metal acetate compound, the concentration of acetate in the reaction zone being employed to control the rate of oxidation and the selectivity of oxidation.There is also provided the catalyst that is employed in the process.

Abstract: There are provided methods for monitoring the oligomeric content of prepolymers and polymers, which methods employ high-performance liquid chromatographic techniques. Typically, the methods of the present invention may be used to determine the oligomeric content of polyethylene terephthalate polymers and prepolymers.