摘要:
Curable mixtures comprising: a) an epoxy resin having more than 1,2-epoxy group per molecule and b) as curing catalyst, an imidazole compound of formula (I), wherein R1, R2 and R3 are each independtly of the others a hydrogen atom, a halogen atom, alkyl having from 1 to 20 carbon atoms, alkoxy having from 1 to 20 carbon atoms, unsubstituted or halo-, nitro-, C1-4alkyl- or C1-4alkoxy-substituted aralkyl having from 7 to 20 carbon atoms, or unsubstituted or halo-, nitro-, C1-4alkyl- or C1-4alkoxy-substituted aryl having from 6 to 20 carbon atoms, and R4 is alkyl having from 1 to 20 carbon atoms, alkenyl having from 2 to 20 carbon atoms, alkynyl having from 2 to 20 carbon atoms, unsubstituted or halo-, nitro-, C1-4alkyl- or C1-4alkoxy-substituted aralkyl having from 7 to 20 carbon atoms or unsubstituted or halo-, nitro-, C1-4alkyl- or C1-4alkoxy-substituted aryl having from 6 to 20 carbon atoms, are suitable for the manufacture of moulding compounds and coatings, especially for the manufacture of foamed materials.
摘要:
Chiral or nonchiral ditertiary diphosphines having solubilizing substituents, for example -NH-C(O)-NH-C(CH2-O-CH2CH2CO2H)3, in the diphosphine framework are excellent ligands for d8 metal complexes which are soluble in polar media, for example water or alcohols, and which can be used as asymmetric or symmetric hydrogenation catalysts for compounds having carbon-carbon or carbon-heteroatom double bonds.
摘要:
A process for the halogenation of activated methylene and methine compounds with at least equimolar amounts of an electrophilic halogenation reagent, which comprises reacting said activated methylene and methine compounds in the presence of catalytic amounts of a titanium compound of the formula I or of a titanium compound of the formula II R 1 TiX 1 X 2 X 3 R 2 R 3 TiX 1 X 2 in which
R 1 is chlorine, bromine or iodine, a substituted or unsubstituted cyclopentadienyl or indenyl, and X 1 , X 2 and X 3 are, independently of one another, chlorine, bromine or iodine, or X 1 , X 2 and X 3 are an organic sulfonate group where R 1 is a substituted or unsubstituted cyclopentadienyl or indenyl; R 2 and R 3 are a substituted or unsubstituted cyclopentadienyl or indenyl, R 2 and R 3 together are a substituted or unsubstituted and bridged or unbridged biscyclopentadienyl or bisindenyl, or R 2 and R 3 together are a substituted or unsubstituted 1,3-, 1,4- or 1,5-diolate, and X 1 and X 2 are, independently of one another, chlorine, bromine or iodine or an organic sulfonate group. If the diolate is enantiopure, the process is enantioselective on use of racemic activated methine compounds.
a) nucleophiles selected from the group alcohols, thioles, amines, metallised hydrocarbons, CH-acidic compounds and metal cyanides, or of b) carbon monoxide mixed with water, alcohols, ammonia, primary or secondary amines, to organic compounds selected from the group of leaving-group-containing aromatics, hetero-aromatics with a C-bonded leaving group, aromatic or hetero-aromatic methyl compounds with a leaving group bonded to the methyl group, ethylenically unsaturated organic compounds with a C-bonded leaving group, or organic allyl compounds with a leaving group in allyl position, or c) vinyl compounds with leaving-group-containing aromatics, whilst cleaving the leaving group in the presence of Pd complexes with monophospholine ligands as the catalyst, whereby variants b) and c) are carried out in the presence of an inorganic base or organic nitrogen base, the process being characterised in that the Pd complex contains secondary monophosphines with aliphatic, branched or cyclic substituents as ligands.
摘要:
An optical detector for carrying out chemical analyses has at least one light source, at least one electric detection unit and at least one measurement cell. One or several optical paths coupled to the measurement cell(s) are formed between the light source(s) and the photoelectric detection unit(s). Separate edge-emitting semiconductor lasers applied on a substrate have been used in the prior art when miniaturising such detection devices arranged in arrays to simultaneously detect a plurality of analytes. The invention provides instead the use of surface-emitting semiconductor lasers as light sources, which have the advantage of being relatively easy to produce and of occupying considerably less space. The process hitherto required to separate the laser from the mother substrate and to glue it on a foreign substrate can be dispensed with in the disclosed detector.
摘要:
An optical sensing unit is provided which comprises at least one sample measurement cell (20), at least one excitation light source acting upon the or each measurement cell to provide one or more sensor fields defining an array of measurement fields, a photoelectric detector array (17) for detecting the intensity of light emitted from the or each measurement cell in response to excitation light, and means for directing light emitted from each measurement field to a respective portion of the photoelectric detector array (14, 15, 16, 17). The sensing unit may be used in combination with multiplexed waveguide arrays or multiplexed planar capillary chromatography or electrophoresis chips.
摘要:
A solid electrolytic capacitor having a solid electrolyte layer, which layer comprises an electrically conductive thermoplastic organic polymer complex having an electric conductivity of 0.1 Scm -1 or more and a glass transition temperature of -100 to 150°C formed on a valve metal foil through a dielectric film. A small and larege-capacity solid electrolytic capacitor having excellent highfrequency characteristic and long-term stability is provided.
摘要:
A planar, electrochemical sensor having a substrate, conductive strips deposited on the substrate, and a dielectric layer insulating portions of the conductive strips except those portions which define a working electrode and at least one second electrode. The working electrode may be defined by an open printed region of the dielectric, or by a needle-punched or laser-burned hole or opening in the dielectric which exposes a small region of one of the conductive strips. A solid electrolyte contacting the electrodes is covered by a semipermeable membrane which may comprise an acrylonitrile butadiene copolymer or an acrylate-based copolymer. A sample chamber is defined by the membrane, a cover member, and a gasket therebetween, and has a volume of from about 1 to about 2 ml. The gasket is formulated from the highly cross-linked polymerization product of epichlorohydrin. All sensor components are selected such that a sensor operable for at least 2 days under normal conditions is produced.
摘要:
A protein adsorbed shapable electroconductive polymer film comprising
1) a film made of a composition comprising
a) at least one polyheteroaromatic compound or aniline in oxidized, polycationic form, and b) at least one polyanion of a film-forming thermoplastic polymer containing sulfated alcoholic groups and/or sulfonatalkylated groups in repeating structural units, wherein the group -(C n H 2n )- is linear or branched C₂-C₁₂-alkylene containing 2 to 5 C-atoms in the carbon main chain, the alkylene being unsubstituted or substituted by C₁-C₄-alkoxy; and
2) a protein adsorbed on said film.
This protein adsorbed shapable electroconductive polymer film can be suitably applied as biosensors, bioreactor materials and immunosensors.
摘要:
A photoreceptor comprises a charge generating layer and a charge transporting layer, the former containing:
(i) as a charge generating compound at least one selected from the group consisting of pyrrolopyrrol, mono- or dithio-pyrrolopyrrol, azo-pigments, quinacridone, phthalocyanine, indanthrone, flavathrone, pyranthrone, anthraquinon, perylene, dioxazine, perinone, thioindigo, isoindoline, isoindolinon and metal complexes ; and (ii) 1-100 wt%, relative to the weight of the above charge generating compound, of a nitroxyl or hydroxylamino compound composed of at least an unsubstituted or substituted 5-, 6- or 7-membered heterocycle containing a divalent group of Formula wherein R 1 and R 2 independently represent methyl, ethyl or phenyl or altogether form a 4-12 membered aliphatic ring, L represents an aromatic residue, Y means O. or OH, or an acid addition salts thereof, or (iia) 0.01-100 wt%, relative to the weight of the above charge generating compound, of a condensation or addition polymer the repeating molecular unit of which contains at least a nitroxyl or hydroxylamino group containing residue, or is substituted by a nitroxyl or hydroxylamino group containing side group, as well as a mixture among them or a mixture with nitroxyl- or hydroxylamine-free components.