Abstract: The olefin polymer composition according to the invention comprises [I] an (.alpha.-olefin/polyene copolymer-containing polymer in an amount of 0.005 to 99 by weight, said .alpha.-olefin/polyene copolymer-containing polymer comprising (i) an .alpha.-olefin/polyene copolymer and (ii) a polyethylene, and [II] a polyethylene in an amount of 1 to 99.995% by weight. The olefin polymer composition comprising the .alpha.-olefin/polyene copolymer-containing polymer [I] and the olefin polymer [II] has a high melt tension and an excellent moldability in an inflation molding, and further it can be molded into a large sized container, etc. by means of a blow molding or the like.

Abstract: A multi-layer film is described having an outer layer containing a linear ethylene-.alpha.-olefin copolymer, an intermediate layer containing a linear ethylene-.alpha.-olefin copolymer, and an inner layer containing a resin in which a predetermined amount of polypropylene is contained in a linear ethylene-.alpha.-olefin copolymer, wherein each component has a predetermined density, respectively, and a predetermined amount of a high-density polyethylene is contained in all layers, and a container using the film. There is no fear of a decrease in sealing strength, deformation, deterioration of transparency, etc., even if sterilization is conducted at a temperature condition of not less than 120.degree. C., and, furthermore, the easy peelable seal part is stable even if the film is molded into a container having a plurality of chambers. Therefore, the resulting container can be suitably used for an infusion bag, etc.

Abstract: There has been provided by the present invention a process for producing a single crystal of potassium niobate which comprises disposing a positive electrode directly or via a semi-insulating substance layer on one c-plane of a single crystal of potassium niobate and also a negative electrode via a semi-insulating substance layer on the other c-plane of the single crystal of potassium niobate, said positive and negative electrodes being disposed in mutually facing relationship, and applying voltage between the positive and negative electrodes so as to pole (convert to the single-domain state) the single crystal of potassium niobate, and which enables to pole the entire region of the single crystal of potassium niobate without quality deterioration.

Abstract: The olefin polymer of the invention is an .alpha.-olefin/polyene copolymer-containing olefin polymer comprising (i) an .alpha.-olefin/polyene copolymer and (ii) an olefin polymer,wherein the polyene is an aliphatic polyene having 7 or more carbon atoms and having an olefinic double bond at both terminals, and the .alpha.-olefin/polyene copolymer contains constituent units derived from the .alpha.-olefin in an amount of 99.999 to 70 mol % and contains constituent units derived from the polyene in an amount of 0.001 to 30 mol %,the olefin polymer (ii) is a polymer of olefin having 3 or more carbon atoms,the .alpha.-olefin/polyene copolymer-containing olefin polymer comprises the .alpha.-olefin/polyene copolymer (i) in an amount of 0.001 to 15% by weight and the olefin polymer (ii) in an amount of 99.999 to 85% by weight, andthe .alpha.-olefin/polyene copolymer-containing olefin polymer is obtained by using a prepolymerized catalyst containing the .alpha.-olefin/polyene copolymer.

Abstract: The polycarbonates of the present invention include those of sucrose series having a specific cyclic structure, those of oligosaccharide and monosaccharide series other than the sucrose series, those derived from specific saccharides having no cyclic structure, those having a skeletal structure of pentaerythritol, neopentyl glycol or trimethylolmethane, and specific dicarbonates.The lubricating oil and electrical insulating oil of the invention contain the above-mentioned polycarbonates.The polycarbonates of tile invention are excellent in compatibility with Freon R-134a (HFC) as well as in lubricating properties, detergency and electrical insulating properties, and are capable of providing lubricating oil for refrigerator, automotive engine oil, automotive gear oil, lubricating oil for rolling and lubricating oil for fiber, especially lubricating oil for which electrical insulating properties are required, and electrical insulating oil.

Abstract: A process for the production of lower olefins by dehydrating lower alcohols having 2 to 4 carbon atoms which comprises using a .gamma.-alumina catalyst containing 0.3% by weight or less of impurities in total excluding SiO.sub.2, the impurities including 0.2% by weight or less of sulfur content calculated in terms of SO.sub.4 - and 0.05% by weight or less of sodium content calculated in terms of Na.sub.2 O, and/or a process for the production of lower olefins by dehydrating lower alcohols having 2 to 4 carbon atoms that comprises using a .gamma.-alumina catalyst which contains 0.5 to 5% by weight of SiO.sub.2.According to the process of the present invention, lower olefins can be produced from lower alcohols with high yield and high selectivity for a prolonged period of time without reducing the catalytic activity.

Abstract: There is disclosed a process for producing an aromatic hydroxylic compound by acid decomposition of a hydroperoxide having the general formula (I) ##STR1## wherein Ar represents an aromatic hydrocarbon group having a valence of n; and n represents an integer of 1 or 2, in the presence of an acid catalyst, thereby to provide an aromatic hydroxylic compound having the general formula (II)Ar--(OH)n (II)wherein Ar and n are the same as above defined, characterized in that tetrafluoroboric acid, hexafluorosilicic acid or hexafluorophosphoric acid is used as the acid catalyst. According to this process, the aromatic hydroxylic compound is obtained in a high yield while the by-production of hydroxyacetone is effectively suppressed.

Abstract: A chlorinated ethylene/.alpha.-olefin copolymer rubber which is a chlorinated product of an ethylene/.alpha.-olefin copolymer rubber having a vinylidene bond at the terminal of the molecule, the number of said vinylidene bond being 0.05 to 1.00 per 1,000 carbon atoms, which has a chlorine content of 20 to 40% by weight, and which has a Mooney viscosity [ML.sub.1+4 (121.degree. C.)] of 10 to 190; and a composition comprising the chlorinated ethylene/.alpha.-olefin copolymer rubber, (a) a reinforcing agent, (b) a softening agent, and (c) a vulcanizing agent.

Abstract: Disclosed is a titanium catalyst component for ethylene polymerization obtained by contacting [A] a solid magnesium aluminum complex containing magnesium, halogen, aluminum and an alkoxy group and/or alcohol having at least 6 carbon atoms, with [B] a tetravalent titanium compound. The solid magnesium aluminum complex [A] is obtained by contacting (a-1) a magnesium solution formed from a halogen-containing magnesium compound, an alcohol having at least 6 carbon atoms and a hydrocarbon solvent, with (a-2) an organoaluminum compound. Also disclosed is a process for ethylene polymerization comprising polymerizing ethylene or copolymerizing ethylene with an .alpha.-olefin having 3 to 20 carbon atoms in the presence of a catalyst for ethylene polymerization comprising [I] the above-mentioned titanium catalyst component for ethylene polymerization and [II] an organoaluminum compound catalyst component.

Abstract: A semiconductor laser of this invention, having a structure of an element composed of: carrier block layers, formed bilaterally externally of an active layer in section which is formed in the vertical direction from the surface of the element, for reducing a light guiding function of the active layer; wave guide layers provided bilaterally externally of said carrier block layers and clad layers provided so that the wave guide layers are sandwiched in between the clad layers. This invention overcomes a dilemma inherent in the conventional weakly guiding laser and LOC structured laser in terms of designing the device for controlling a guided mode. The present invention also solves the problems in terms of attaining higher outputting and a low dispersion of the radiation beams and improving a beam profile.

Abstract: An ethylene/.alpha.-olefin copolymer composition containing a first and second ethylene/.alpha.-olefin copolymer is disclosed. The first ethylene/.alpha.-olefin copolymer is prepared in the prsence of a polymerization catalyst containing an organoaluminum oxy compound and at least two kinds of metallocene compounds (b) and the second ethylene/.alpha.-olefin copolymer, which differs from the first in at least one physical property, is prepared in the presence of a polymerization catalyst containing an organoaluminum oxy compound and a metallocene compound (b'). The ethylene/.alpha.-olefin copolymer composition has excellent moldability and heat stability properties and forms films having high transparency and mechanical strength.

Abstract: The present invention provides an ethylene/.alpha.-olefin copolymer comprising constituent units (a) derived from ethylene and constituent units (b) derived from an .alpha.-olefin having 3 to 20 carbon atoms, the ethylene copolymer being characterized in that(A) the ethylene/.alpha.-olefin copolymer has a density (d) of 0.88 to 0.95 g/cm.sup.3 ;(B) the ethylene/.alpha.-olefin copolymer has a MFR of 0.01 to 200 g/10 min as measured at a temperature of 190.degree. C. and a load of 2.16 kg;(C) the temperature (Tm) at which the exothermic curve of the ethylene/.alpha.-olefin copolymer measured by a differential scanning calorimeter (DSC) shows the highest peak and the density (d) satisfy the relationTm<400d-250;(D) the quantity fraction (W) of a n-decane-soluble component at room temperature satisfy the relation,in the case of MFR.ltoreq.10 g/10 min.,W<80.times.exp (-100(d-0.88))+0.1in the case of MFR.gtoreq.10 g/10 min.,W<80.times.(MFR-9).sup.0.35 .times.exp (-100(d-0.88))+0.

Abstract: A process for isomerization of an endo-form of aromatic group-containing norbornenes represented by the following formula (I) to an exo-form which comprises bringing the endo-form into contact with a solid acid catalyst. ##STR1## wherein p is 0 or an integer of 1 or more, q and r are each 0, 1 or 2, R.sup.1 to R.sup.15 are each independently hydrogen or halogen atom, aliphatic hydrocarbon group, aromatic hydrocarbon group or alkoxy group, R.sup.5 (or R.sup.6) are R.sup.9 (or R.sup.7) may be linked together through an alkylene group of 1-3 carbons or may be directly linked together.

Abstract: The present invention relates to a solid catalyst composed of a specific solid catalyst component [A-1], the catalyst containing the solid catalyst and the olefin polymerization process using the solid catalyst, in which the solid catalyst component [A-1] comprises; (a-1) a particulate carrier composed of a specific oxide of a metal; (a-2) an organoaluminum oxy compound; and (a-3) a specific transition metal compound containing a specific ligand, wherein the organoaluminum oxy compound (a-2) and the transition metal compound (a-3) are supported on the particulate carrier (a-1).The catalysts are applicable to a suspension polymerization and a vapor phase polymerization, and capable of preparing spherical olefin polymers excellent in particle characteristics at high polymerization activity.

Abstract: A topsheet for use in body fluid absorptive articles is so improved that collapse and clogging of liquid passages therein may be reliably avoided. The topsheet includes an upper sheet, provided with skin-contacting areas and liquid passages, and a lower sheet provided with skin-non-contacting areas, areas welded to the liquid passages, and exposed areas. The exposed areas are welded to each of the liquid passages around lower openings thereof so as to protect the liquid passage against collapse and clogging. The exposed areas define a skin-contacting surface which rises up into each of the liquid passages without extending above the upper surface of the skin-contacting areas. The upper sheet cooperates with the lower sheet to define cavities extending in the direction of the topsheet thickness.

Abstract: The ethylene/.alpha.-olefin/diene rubber composition of the present invention is a specific ethylene/.alpha.-olefin/diene rubber composition comprising a high-molecular ethylene/.alpha.-olefin/diene copolymer rubber (A) having a specific molecular weight distribution, a specific intrinsic viscosity [.eta.] and a specific iodine value, and a low-molecular liquid ethylene/.alpha.-olefin copolymer (B) having a specific intrinsic viscosity [.eta.]. This ethylene/.alpha.-olefin/diene rubber composition of the invention is excellent in both the processability (flowability) and the shape retention properties in the vulcanization molding process, and the rubber composition can provide a vulcanized rubber molded product which is excellent in surface smoothness, mechanical strength, low-compression permanent strain properties, resistance to abrasion and resistance to dynamic fatigue.

Abstract: Information recording discs comprise a disc substrate having a recording layer on one side thereof, one hub having an insertion portion to be inserted into a center hole of the disc substrate and a flange portion to cover the disc substrate in the vicinity of the center hole, at least an apex of the insertion portion being composed of a magnetic material, the hub being inserted into the center hole so that the flange portion is positioned on the recording layer side of the disc substrate, and an adhesive layer is provided between the flange portion and the disc substrate. By this construction, a portion of the hub which protrudes from the back surface of the disc substrate, facing toward the spindle of a turn table can be altered in dimension and/or the diameter of the protrusion portion of the hub can be made smaller than that of the center hole of the disc substrate.

Abstract: An active energy ray-curable composition comprising (A) an epoxy resin, (B) a compound selected from the group consisting of sulfonium salts and cyclopentadienyl iron compounds, (C) a compound selected from the group consisting of acrylates, methacrylates and oligomers thereof, and (D) an organic peroxide, and optionally (E) a rubber component. The composition is useful for an adhesive layer of an optical recording medium.

Abstract: A novel hydrazine compound represented by the formula (I) is disclosed. ##STR1## Also disclosed are a process for preparing the novel hydrazine compound comprising reacting a specific hydrazine compound and a specific acid halide, a nonlinear optical organic material comprising the hydrazine compound represented by the above formula (I), and a nonlinear optical organic element comprising the nonlinear optical organic material. The nonlinear optical organic material shows excellent nonlinear optical effect, and the material is favorably applied to nonlinear optical organic elements such as an optical wavelength conversion element and an electrooptical element.

Abstract: Disclosed is a photocurable composition comprising (a) a radical-polymerizable monomer, (b) an .alpha.-ketocarbonyl compound and (c) a derivative of mercaptobenzimidazole, mercaptobenzothiazole or mercaptobenzoxazole or an aromatic amine nucleus-substituted with an electron-attractive group. This composition has a high photocuring speed at a temperature close to normal temperature and gives a cured product excellent in various physical properties. This composition is valuable as a dental adhesive or resin.