Abstract: This invention relates to a denitrifying composition which is a material to be used for decomposing nitrates nitrogen in effluent by sulfur-oxidizing bacteria that consume sulfur and carbonate as nutrients and is characterized by containing particles of calcium carbonate dispersed in sulfur. Preferably, the composition contains 10 parts by weight of sulfur coexisting with 10-15 parts by weight of calcium carbonate and 1-3 parts by weight of a microporous substance. This denitrifying composition can be prepared by heating powder of calcium carbonate and sulfur thereby melting the sulfur, dispersing the powder of calcium carbonate in liquid sulfur and solidifying the dispersion by rapid cooling. The composition simultaneously contains nutrients and alkali source and hence enables denitrification to proceed stably without addition of other components.

Abstract: This invention relates to a resin composition useful as a vibration-damping agent and the like. The resin composition is formulated by adding 1 wt % or more of styrenated phenol obtained by the reaction of a phenol with styrene to a polycyclic aromatic oligomer obtained by condensing a polycyclic aromatic compound containing 2 to 3 rings and formaldehyde. The polycyclic aromatic oligomer is obtained by the reaction of a polycyclic aromatic compound with formaldehyde and, if necessary, further with a phenol in the presence of an acid catalyst and has a number average molecular weight of 300–1000. The styrenated phenol is obtained by the reaction of 1 mole of a phenol with 1–2.5 moles of styrene in the presence of an acid catalyst.

Abstract: This invention relates to a laminate which is excellent in heat resistance after moisture absorption required in a lead-free solder joint, and is suitable for use in flexible printed wiring boards or HDD suspensions. The laminate for electronic materials of this invention is constituted of a conductor layer and an insulating resin layer having a polyimide-based resin layer (A) and a polyimide-based resin layer (B). The polyimide-based resin layer (A) constituting the insulating layer includes a polyimide-based resin obtained by reacting a diamine containing 40 mol % or more of 4,4?-diamino-2,2?-dimethylbiphenyl with an aromatic tetracarboxylic acid, and the polyimide-based resin layer (B) includes a polyimide-based resin containing 80 mol % or more of a structural unit generated from bis(4-aminophenoxy)benzene or 2,2-bis[4-(4-aminophenoxy)phenyl]propane, and pyromellitic acid, benzophenonetetracarboxylic acid, diphenylsulfonetetracarboxylic acid or biphenyltetracarboxylic acid.

Abstract: This invention relates to a fuel cell separator of excellent electrical conductivity, gas impermeability and strength. The composition for a fuel cell separator of this invention comprises a resin binder with a viscosity of 0.01–0.5 Pa·s at 150° C. and a viscosity of 3 Pa·s or more at 25° C. and graphite particles at a weight ratio of 1:(5–15) and a curing accelerator. The resin binder is exemplified by an epoxy resin binder composed of an epoxy resin and a curing agent for the epoxy resin. The process for producing the fuel cell separator of this invention is practiced by kneading and molding the aforementioned composition for a fuel cell separator and curing above the curing temperature of the composition. The fuel cell separator of this invention to be obtained by the aforementioned process shows a bulk density of 1.90 g/cm3 or more, a sheet resistance (areal pressure, 0.5 MPa) of 40 m ?cm2 or less, a gas permeability of 1×10?14 cm2 or less and a flexural strength of 30 MPa or more.

Abstract: This invention relates to a process for preparing high-purity aromatic oligomers by effectively separating an organic layer containing aromatic oligomers or the reaction products of a polycyclic aromatic compound with formaldehyde from an aqueous layer containing an acid catalyst in a simplified manner, hitherto regarded difficult to accomplish, and obtaining high-purity aromatic oligomers from the organic layer containing a reduced amount of impurities. In separating the aqueous layer containing the acid catalyst and the organic layer containing the oligomers from the reaction mixture formed by the condensation of a polycyclic aromatic compound and formaldehyde, the emulsion phase is broken by adding a nonionic or cationic surfactant in an effective amount and an alkali in an amount sufficient to neutralize 1–70% of the acid in the acid catalyst, the organic and aqueous layers are separated and the aromatic oligomers are recovered from the organic layer.

Abstract: This invention relates to a method for treating acidic waste water, particularly mine effluent, and to a solid waste water treating material useful for the method. This waste water treating material is obtained by solidifying a mixture of rock wool and an inorganic binder mainly containing at least one kind selected from silicates, hydroxides and oxides of alkaline earth metals and alkali metals and has a porosity of 50% or more. When brought into contact with acidic waste water containing iron ions and sulfate ions, this waste treating material can not only neutralize the waste water but also remove harmful heavy metals such as iron and arsenic. Furthermore, it is easy to dispose the spent waste water treating material.

Abstract: This invention relates to a silicone resin composition which exhibits high heat resistance, high transparency and high dimensional stability and thus can be suitably used for optical applications such as a lens, an optical disc, an optical fiber, a substrate for a plat panel display, a window material for an automobile, and the like.

Abstract: Provided are an amorphous coke for a special carbon material characterized in that it is an amorphous coke obtained by blending a coal tar base heavy oil and/or a petroleum base heavy oil with a resin and subjecting the mixture to thermal decomposition polycondensation; it has a larger thermal expansion coefficient than that of a coke obtained from a heavy oil alone; and a molded article of the coke is shrunk by 0.3% or more in terms of a volume change rate before and after the treatment when it is subjected to graphitizing treatment, and a production process of an amorphous coke for a special carbon material characterized in that in subjecting a coal tar base heavy oil or a petroleum base heavy oil to thermal decomposition polycondensation, the raw material is blended with a resin to modify a coke crystal structure.

Abstract: This invention relates to a laminate which changes in dimension to such a small extent as not to cause curling and warpage when the ambient humidity changes and is useful for flexible printed wiring boards. The laminate possesses a polyimide layer or layers of polyimides formed on a conductor by coating and at least one of the polyimide layers is composed of polyimide of low hygroscopic expansion obtained by the reaction of diamines containing 20 mol % or more of 4,4?-diamino-2,2?-dimethylbiphenyl with a tetracarboxylic acid compound and exhibiting a coefficient of linear hygroscopic expansion of 15×10?6/% RH or less.

Abstract: This invention relates to a siloxane-modified polyimide resin which shows excellent adhesiveness and can be bonded by thermocompression at high temperature even after subjection to thermal hysteresis in the manufacturing step for electronic parts. This polyimide resin is obtained from an aromatic tetracarboxylic acid dianhydride (A) and a diamine (B) comprising 30–95 mol % of a bis(4-aminophenoxy)alkane (B1) and 5–70 mol % of a siloxanediamine (B2) as essential components.

Abstract: This invention relates to highly reliable organic electroluminescent (EL) materials and devices exhibiting high luminance, high light emitting efficiency, minimal deterioration in light emission, usability at high temperature and good storage stability. The organic electroluminescent device of this invention has intermediate layers such as light emitting layer, hole transport layer, hole injection layer and the like arranged between the anode and the cathode and at least one of the intermediate layers comprises a triarylamine derivative represented by general formula (1) (wherein Ar1-Ar3 are substituted or unsubstituted aryl groups and at least one of Ar1-Ar3 is 9-phenanthryl group represented by general formula (2)); (wherein R1-R9 are H, halogen, alkyl group, aralkyl group, alkenyl group, cyano group, acyl group, alkoxycarbonyl group, alkoxy group or the like).

Abstract: The hydrogenated aromatic oligomer of this invention is represented by the following formula (1) (A-F)n-A??(1) (wherein A is a segment comprising mainly a polycyclic aromatic compound, a phenol and at least partly hydrogenated products of these two, F is methylene or dimethylene ether and n is a number in the range of 1-100) and obtained by the reaction of a polycyclic aromatic compound such as naphthalene with formaldehyde or a derivative thereof and a phenol in the presence of an acid catalyst followed by hydrogenation of the product aromatic oligomer. This oligomer is odorless, highly transparent and useful as an improver of the adhesiveness and vibration damping properties when incorporated in resins and rubbers and performs excellently as a vibration damping agent in a wide temperature range.

Abstract: This invention relates to novel epoxy resins and epoxy resin compositions comprising said epoxy resins or cured articles thereof. The cured articles have excellent properties in respect to flame retardance, adhesiveness, moisture resistance and heat resistance and can be used in applications such as lamination, molding, casting and adhesion. The epoxy resins of this invention are represented by the following formula (3) wherein Y1 denotes a glycidyloxyarylmethyl group represented by —CH2—Ar—OG, Y2 and Y3 denote independently a glycidyl group or the aforementioned glycidyloxyarylmethyl group, Ar denotes a phenylene group which can be substituted with up to two hydrocarbon groups and G denotes a glycidyl group.

Abstract: There is provided a durable low-torque lubricating oil for bearings and fluid dynamic bearings, porous oil-impregnated bearings and hydrodynamic type porous oil-impregnated bearings suitable for use as bearings in small-sized spindle motors for information equipment. The lubricating oil composition comprising (A) a diester of a monovalent aliphatic alcohol containing 6-10 carbon atoms and a saturated aliphatic dicarboxylic acid containing 10 carbon atoms as base oil and (B) 3-20% by weight of a low-viscosity lubricating oil with a kinematic viscosity of less than 11 mm2/s at 40° C., a fluid dynamic pressure bearing unit or a porous oil-impregnated bearing unit containing said lubricating oil composition or a spindle motor provided with said bearing unit.

Abstract: An adhesive polyimide resin which comprises a siloxane polyimide resin obtained from (A) an aromatic tetracarboxylic dianhydride and (B) a diamine ingredient comprising (B1) a diamine having a phenolic hydroxyl group, carboxyl group, or vinyl group as a crosslinkable reactive group and (B2) a siloxanediamine and has a glass transition temperature of 50 to 250?C and a Young's modulus (storage modulus) at 250?C of 105 Pa or higher; and a laminate which comprises a substrate comprising a conductor layer and an insulating supporting layer having at least one polyimide resin layer and, disposed on a surface of the substrate, an adhesive layer comprising a layer of the adhesive polyimide resin. The adhesive polyimide resin and the laminate have satisfactory adhesion strength even after exposure to a high temperature of up to 270?C and further have excellent heat resistance in reflow ovens. They are hence suitable for use in the bonding of electronic parts.

Abstract: This invention relates to a method for sublimation refining which gives a high-purity product in high yield while preventing corrosion of the apparatus, contamination of the product and change in quality of the product and to an apparatus useful for the method. The apparatus of this invention for sublimation refining comprises a heat generating unit made of a material generating heat by electromagnetic induction, sublimating unit A and collecting units B and C, respectively independently controllable in temperature by electromagnetic induction heating and the inner surface or the inner tube of the sublimating or collecting unit is made of a material like metal and ceramic inert to sublimable substances.

Abstract: This invention relates to a low-molecular-weight compound which is soluble in solvents and useful for a luminescent material and to an organic electroluminescent element (EL element) which comprises said luminescent material in its electroluminescent layer. The EL element comprises an EL material represented by the following formula (1) between electrodes at least one of which is transparent In formula (1), Ar1 is a group represented by the following formula (2), Ar2 is a group represented by the following formula (3) or (4) and Ar1 and Ar2 may condense to form a 10-membered ring in case Ar2 is represented by the following formula (3); wherein R1-R4 and R5 are hydrogen, alkyl, aryl and the like, Z is a divalent or trivalent metal such as zinc, aluminum, copper, beryllium, ruthenium, cobalt, rhodium, iridium and platinum and n is 2 or 3.

Abstract: This invention relates to a novel polyarylene sulfide resin or a resin composition comprising said polyarylene sulfide resin moldable with reduced generation of flash. The polyarylene sulfide resin of this invention comprises 0.5-10% by weight of the constituent unit represented by the following general formula (1) and 80-99.5% by weight of the constituent unit represented by the following general formula (2): —(Ar1—S—)n  (1) —(Ar2—S—)m  (2) wherein Ar1 is the radical represented by general formula (3), Ar2 is phenylene or alkyl-substituted phenylene radical, R1-R7 are independently hydrogen atoms or lower alkyl radicals containing 1-3 carbon atoms and n and m are integers of 1 or more.

Abstract: This invention relates to a photo- or heat-curable resin composition which yields a cured product with minimal cracking and high reliability. The resin composition of this invention comprises 100 parts by weight of the resin-forming component containing a photo- or heat-polymerizable unsaturated compound and 0.01-5 parts by weight of an inorganic filler such as silica sol with its average particle diameter controlled in the range 5 nm-0.5 &mgr;m. The composition exhibits high heat resistance and good microfabrication quality and is useful as a peripheral material of electronic parts such as semiconductor devices by the build-up process, for example, as a material for forming insulation layers in multilayer printed wiring boards.

Abstract: This invention relates to an insulating resin composition which exhibits high impact resistance and heat resistance and good adhesiveness to the plating metal, is selectively etchable by a permanganate salt commonly used in a plating operation and suited for an insulating layer in multilayer wiring boards. The insulating resin composition is a photo-polymerizable or thermally polymerizable resin composition comprising 3-10 parts by weight of a crosslinked elastic polymer per 100 parts by weight of a resin component (excluding the crosslinked elastic poly and including monomers) and said crosslinked elastic polymer has carboxyl groups and is dispersed with an average secondary particle diameter in the range of 0.5-2 &mgr;m.