Abstract: The present invention relates to a blue light-emitting compound for organic polymer EL devices and organic EL devices having superior color purity and light-emitting efficiency by providing a blue light-emitting compound for organic EL devices represented by Chemical Formula 1 and an organic EL device using the blue light-emitting compound: 1

Abstract: A plurality of solder layers are disposed on a substrate and an optical component is aligned on each of the solder layer. Laser beams are applied to a corresponding section of the substrate to heat a first solder layer on which a first optical component is positioned. Then, the first solder layer is cooled so that the first optical component is bonded to the substrate. Subsequently, laser beams are applied to a second solder layer to bond a second optical component thereon to the substrate.

Abstract: The present invention relates to a novel epoxy resin curing system comprising a cationic latent catalytic curing agent containing a hexafluoroantimonate, characterized by exhibiting no shrinkage of volume or inducing an expansion of volume during the curing reaction of the epoxy resin.

Abstract: The present invention relates to a novel latent curing agent which is capable of controlling the initiation reaction stage and is curable by heat and/or UV-light, an epoxy resin composition containing it, and a mixed epoxy composition (blend) having different functional groups. Particularly, it has been found that the epoxy resin composition consisting of an aliphatic type epoxy (CAE) and/or a difunctional bisphenol A type epoxy (DGEBA) has excellent mechanical properties.

Abstract: An easy method proposes a passive alignment by using an alignment mark. That is, V-shaped grooves are utilized as alignment marks in place of a metal pattern of the prior art in observing an optical contrast. Also, in order to adjust a height of an optical device, the support made of a metal is formed in the conventional method, whereas in the present invention a height of an optical device is adjusted by etching the silicon substrate and clamped through the use of solder bumps formed in the V-shaped grooves. And also, in this invention, it is possible that V-shaped grooves can be facilely formed on a non-planarized substrate by using a method of burying a mask material during the formation of the V-shaped grooves. By applying the above principle, the present invention proposes a process capable of passive aligning an optical device, a planar lightwave circuit (PLC) and an optical fiber, simultaneously.

Abstract: A polymer/liquid crystal dispersion includes a liquid crystal, a surfactant and a water soluble copolymer obtained by polymerizing a hydrophilic monomer with one or more hydrophobic monomers. The concentration of the hydrophobic monomer may be 14 to 25% by weight based on the combined weight of the hydrophobic monomer and the hydrophilic monomer. The hydrophobic monomer may be styrene, 3-(trifluoromethyl)styrene, nonylphenol, methacryloyl chloride, methacrylate, and acrylate. The hydrophilic monomer may be acrylamide, acrylonitrile or acryloyl chloride. Preferably, the hydrophilic monomer is acrylamide or a derivative thereof and the hydrophobic monomer is styrene, methyl methacrylate or vinyl acetate. The liquid crystal may be a nematic liquid crystal formed of an azomethine compound or an azo compound. The water soluble copolymer, the liquid crystal, the surfactant and water may form a liquid crystal/aqueous polymer solution.

Abstract: A polymer liquid crystal emulsion includes a liquid crystal and a water soluble copolymer obtained by polymerizing a hydrophilic monomer with one or more hydrophobic monomers. The concentration of the hydrophobic monomer may be 14 to 25% by weight based on the combined weight of the hydrophobic monomer and the hydrophilic monomer. The hydrophobic monomer may be styrene, methyl methacrylate, vinyl acetate, acrylate or methacrylate. The hydrophilic monomer may be acrylamide, acrylonitrile or acryloylchloride. Preferably, the hydrophilic monomer is acrylamide or a derivative thereof and the hydrophobic monomer is styrene, methyl methacrylate or vinyl acetate. The liquid crystal may be a nematic liquid crystal formed of an azomethine compound or an azo compound. The water soluble copolymer, the liquid crystal and water may form a liquid crystal/aqueous polymer solution. In this case, the concentration of the liquid crystal in the liquid crystal/aqueous polymer solution is in the range of 50 to 70% by weight.

Abstract: The present invention relates to a method for preparing a carbon-carbon composite. The method of the present invention comprises adding a ceramic-based oxidation inhibitor having a brittle-to-ductile transition, to thereby eliminate high densification processes via re-impregnation and re-carbonization. The present invention also relates to a carbon-carbon composite prepared thereby that comprises a ceramic powder added to a thermosetting resin.

Abstract: A polymer liquid crystal emulsion includes a liquid crystal and a water soluble copolymer obtained by polymerizing a hydrophilic monomer with one or more hydrophobic monomers. The concentration of the hydrophobic monomer may be 14 to 25% by weight based on the combined weight of the hydrophobic monomer and the hydrophilic monomer. The hydrophobic monomer may be styrene, methyl methacrylate, vinyl acetate, acrylate or methacrylate. The hydrophilic monomer may be acrylamide, acrylonitrile or acryloylchloride. Preferably, the hydrophilic monomer is acrylamide or a derivative thereof and the hydrophobic monomer is styrene, methyl methacrylate or vinyl acetate. The liquid crystal may be a nematic liquid crystal formed of an azomethine compound or an azo compound. The water soluble copolymer, the liquid crystal and water may form a liquid crystal/aqueous polymer solution. In this case, the concentration of the liquid crystal in the liquid crystal/aqueous polymer solution is in the range of 50 to 70% by weight.

Abstract: The present invention relates to a process for manufacturing activated carbon fibers having greatly improved adsorption performance time and adsorption performance when in contact with surface oxides such as in the case where gas and liquid impurities are treated. The process of the present invention comprises the following steps: a) placing conventional activated carbon fibers between an anode and a cathode plate in an acidic or an alkaline electrolytic solution, and b) applying a certain voltage at a current density between said graphite anode and graphite cathode plate. The present invention also relates to the product resulting from this process and the use of this product.

Abstract: A method for preparing a high-heat-resistant-epoxy-resin composition which comprises adding, as catalytic curing agent, a quinoxalinium salt having a benzyl group to difunctional and multifunctional epoxy resin and thermoset resin having a similar structure. The epoxy-resin composition obtained by the present invention is excellent in its impregnating property, processability, impact resistance, drug resistance, electric-insulating property, and adhesiveness.

Abstract: A heat-curable resin composition comprising a multifunctional epoxy resin monomer and a heat-latent curing agent of formula (I) provides a cured epoxy resin having good thermal and dimensional stability: ##STR1## wherein: R is hydrogen, a C.sub.1-4 alkyl or C.sub.1-4 alkoxy group.

Abstract: The present invention provides a method for producing a honeycomb core having excellent thermal stability, mechanical properties and a rapid setting speed, which comprises applying adhesives onto ribbon type of carbon fiber fabrics at regular intervals so as to form the specific size of a cell, attaching the ribbons in a layered form and heat setting and expanding the attached portion to form a basic honeycomb core and then impregnating and setting the basic honeycomb core in phenol resin containing 0.5 to 4% by weight of graphite powder having 0.3 to 2 .mu.m of average diameter. This method is characterized by the fact that fiber breakage due to thermal decomposition gas occurring in the setting treatment is prevented and the dispersing effect of surface of graphite is maximized, and thereby the thermal and mechanical properties of the honeycomb core can be optimized.