Abstract: An improved process for producing an ethylene copolymer composed of a major proportion of ethylene and a minor proportion of an alpha-olefin having 3 to 10 carbon atoms and having a density of 0.910 to 0.945 g/cm.sup.3 and an ethylene content of 85 to 99.5 mole %. The use of a titanium catalyst component (A) which meets a parametric combination of specific requirements is essential in this process. The process can industrially advantageously give a low to medium density ethylene copolymer of high quality with high productivity while advantageously circumventing the operational troubles which have been difficult to avoid by conventional processes.

Abstract: Adhesives for ceramics obtained as first adhesives for ceramics according to the invention are excellent in bond properties as well as in water resistance because they contain first acidic compounds such as organic carboxylic acids in addition to silane coupling agents, polymerizable monomers and polymerization catalysts. Further, adhesives for ceramics obtained as second adhesives for ceramics according to the invention are excellent in bond properties as well as in dependability and water resistance because they contain metal salts in addition to silane coupling agents, polymerizable monomers and polymerization catalysts. Furthermore, adhesives for ceramics obtained as third adhesives for ceramics according to the invention are excellent in bond properties as well as dependability and water resistance because they contain second acidic compounds selected from among metal salts and organic carboxylic acid anhydrides in addition to silane coupling agents, polymerizable monomers and polymerization catalysts.

Abstract: An elongated flexible metal clad laminate formed of at least one metal layer and at least one plastic layer and having a smaller interlayer dimensional difference and excellent process-ability. A defect that a dimension of the metal layer is longer than a corresponding dimension of the plastic layer when they are compared to each other as discrete layers has been corrected by causing the metal layer to continually undergo compression plastic deformation in the form of the laminate and hence compressing the metal layer. A production method for the laminate and an apparatus for the method.

Abstract: A polyethylene resin composition comprised of(A) 30 to 50% by weight of a linear low density polyethylene resin wherein(i) the MFR.sub.190.degree. C. is 0.3 to 3.0/10 min,(ii) the density is 0.900 to 0.918 g/cc,(iii) the MI.sub.20 /MI.sub.2 is 40 or less,(iv) there are one or more endothermic peaks of the melting point determined by a differential scanning calorimeter, wherein, when there are two or more peaks, the highest melting point (T.sub.m1) is 118.degree. to 125.degree. C. and the ratio T.sub.m1 H/T.sub.m2 H between the endothermic peak height (T.sub.m1 H) of the highest melting point and the next low temperature side endothermic peak height (T.sub.m2 H) of 1.2 or less, and(v) the comonomer is an .alpha.-olefin having four or more carbon atoms;(B) 20 to 40% by weight of a high density polyethylene resin wherein(i) the MFR.sub.190.degree. C. is 0.01 to 0.2 g/10 min,(ii) the density is 0.935 to 0.950 g/cc, and(iii) the MI.sub.20 /MI.sub.

Abstract: Ceramic green tape formulations are described comprising critical amounts of a ceramic powder, poly(propylene carbonate) as the binder, a solvent mixture and a plasticizer. These ingredients are admixed to yield a slurry having a Brookfield viscosity in the range of about 500 to 4500 cps at 25.degree. C. The slurry is cast into a thin film on a substrate, the solvent mixture is removed from the film and the green tape is removed from the substrate. The poly(propylene carbon)-based green tapes have been shown to have tensile strengths of greater than 35 psi and flexibility which would permit successful punching of register and feed-through (via) holes and screen printing. The green tapes of this method are easily laminated to produce multilayered capacitors and other multilayered structures having ceramic contents well in the range generally considered desirable for ceramic processing.

Abstract: The present invention relates to a novel (-)-2-pyrazoline compound and therapeutic agents containing the same as an effective ingredient; furthermore, it relates to a method for optically resolving 1-(3-pyridylcarbonyl)-5-methyl-2-pyrazoline.

Abstract: An optical molding method includes the step of radiating a light flux onto a photocurable fluid substance while moving the light flux in such a manner as to draw a section of a target object so as to cure the irradiated portion. A plurality of light fluxes having different diameters is used in such a manner that only a light flux having a large diameter, or both a light flux having a large diameter and a light flux having a small diameter are used for a section having a thickness larger than the diameter of the light flux having a large diameter, while only a light flux having a small diameter is used for a section having a thickness smaller than the diameter of the light flux having a large diameter.

Abstract: In one method, a base for supporting a cured object is brought into close contact with or close to an aperture of a container so as to remove the bubbles therebetween. When one layer is formed, parts of the layer may be successively formed, wherein the base is moved back and forth to separate each part. Also, the aperture or container with the aperture may be inclined relative to the base to separate the layer from the aperture.

Abstract: A norcamphane dicarbonitrile is produced by hydrocyanation of bicyclo [2,2,1]-5-heptene-2-carbonitrile in the presence of a zerovalent nickel complex catalyst and Lewis acid and treating the resulting crude product by contact with a catalyst treating agent.

Abstract: A method for preparing 2,2-bis(4-hydroxyphenyl)propane comprises reacting acetone and phenol in the presence of an acidic ion-exchange resin as a catalyst wherein the reaction of acetone and phenol is performed while removing a part of the water generated during the reaction from a mixed solution containing acetone and phenol by a pervaporation method. According to the method, the water generated through the reaction can rapidly be removed simultaneously with or alternatively to the reaction by a pervaporation operation and, therefore, the catalytic activity of the ion-exchange resin is not impaired at all. Moreover, any complicated operations associated with the dehydration are not required. Thus, the acidic ion-exchange resin catalyst can continuously be used over a long time period without any treatment for the regeneration thereof. Further, according to the method, bisphenol A can be economically prepared from acetone and phenol in a high conversion rate and high yield.

Abstract: Polyimide having repeating units of the following formula (I) and its polyamic acid precursor having repeating units of the following formula (II) are disclosed; ##STR1## (where Y is a radical selected from the group consisting of a bond, divalent hydrocarbon having 1 to 10 carbons, hexafluorinated isopropylidene, carbonyl, thio, sulfinyl, sulfonyl and oxide, and R is a tetra-valent radical selected from the group consisting of aliphatic radical having 2 and more carbons, cyclo-aliphatic radical, monoaromatic radical, condensed polyaromatic radical, and noncondensed polyaromatic radical wherein aromatic radicals are mutually connected with a bond or a crosslinking function).Typical examples of polyimide and polyamic acid include where Y is thio radical and R is ##STR2## Y is a bond and R is III or IV, and Y is isopropylidene radical and R is IV.The polymers can be prepared from corresponding diamine and tetracarboxylic acid dianhydride.

Abstract: Provided are carbon-fiber-reinforced polyimide resin compositions having excellent mechanical strength. The compositions are formed of (a) 5-50 parts by weight of carbon fibers, which have been obtained by coating starting carbon fibers at surfaces thereof with an aromatic polysulfone resin and then heating the thus-coated carbon fibers at 300.degree.-400.degree. C., and (b) 95-50 parts by weight of a polyimide resin which perferably have recurring units of following formula: ##STR1## wherein X represents a specific divalent radical and R represents a particular tetra-valent radical.

Abstract: Novel fluoran compounds represented by the formula (I): ##STR1## wherein R.sup.1 is an alkyl group having from 1 to 4 carbon atoms, preparation process of the fluoran compounds, and a heat-sensitive and a pressure-sensitive recording material comprising the fluoran compound, are disclosed.

Abstract: A discharge electrode for a charger has a thin wire or core made of stainless steel or electrolytically polished tungsten, and a coating provided on the thin line. To form the coating, amorphous alloy containing tantalum, niobium, zirconium, titanium or similar element belonging to the same group on the periodic table is deposited on the thin wire by sputtering, CVD (Chemical Vapor Deposition) or similar technology. The content of tantalum in the amorphous alloy is selected to be 10 at % to 70 at %.

Abstract: The present invention relates to a mercapto compound, a process for preparing the mercapto compound, a process for preparing a polythiourethane base resin containing the mercapto compound, and a process for preparing plastic lenses containing the resin.

Abstract: A moisture curable polyurethane composition comprising a polyaldimine represented by the formula (I):Y--N=CH-X).sub.n (I)wherein X is an aryl group having from 6 to 15 carbon atoms, Y is a divalent or trivalent hydrocarbon group having from 2 to 15 carbon atoms or a divalent or trivalent polyoxyalkylene group having a molecular weight of from 70 to 6000, and n is an integer of 2 or 3, and a polyisocyanate and/or a polyurethane prepolymer having 2 or more isocyanate groups; and a water proof material, flooring material, sealing material, wall covering material and paint comprising said composition and various fillers, are disclosed. The polyurethane composition has excellent storage stability and quick rate of curing in application.

Abstract: A dust-proof film comprising a pellicle frame and a pellicle film spread on one side face of the frame, which is attached to a photomask, a reticle or the like to prevent a foreign substance from adhering to a pattern, wherein a paint is coated on the inner side face of the pellicle frame to form a coating layer, whereby a generation of dust from a surface of the pellicle frame is prevented.

Abstract: This invention relates to molding resin compositions, and more particularly relates to polyimide resin compositions having markedly improved molding ability in addition to excellent high temperature stability, chemical resistance and mechanical strength.The polyimide resin composition of this invention comprises 99.9 to 50% by weight of the polyimide and 0.1 to 50% by weight of high temperature engineering polymer. The polyimide has recurring units of the following formula: ##STR1## wherein X is a sulfonyl radical or a carbonyl radical and R is a tetravalent radical selected from an aliphatic radical, alicyclic radical, monoaromatic radical, condensed aromatic radical and non-condensed aromatic radical.

Abstract: An electrolytic cell for the production of a nitrogen trifluoride gas by a molten salt electrolysis comprises electrodes, partition plates, bottom surface, liquid surface of an elecrolytic bath and lids, at least some of these members being in a particular distance relationship.

Abstract: A process for preparing substantially purified aqueous indole solution. In the process of the present invention, crude indole containing an organic impurity is dissolved in an organic solvent which is immiscible with water, the distribution ratio of the impurity to the organic phase, when two-phase liquid system is formed with the organic solvent and an aqueous medium, being greater than that of indole; and the indole solution is contacted with water or an aqueous reaction medium for conducting the reaction to form two-phase liquid system and to distribute indole to the aqueous phase.