Abstract: A thermotropic liquid crystal polyester and a sealing material used for electric and electronic parts prepared from the thermotropic liquid crystal polyester, which polyester can be molded at low temperatures, while which polyester has heat resistance capable of well withstanding the process such as soldering. The thermotropic liquid crystal polyester is characterized in that it contains five kinds of specified repeating structural units in the respective ratios and it meets specific conditions of an intrinsic viscosity or the temperature of complete melting and storage elastic modulus.

Abstract: A web spreading apparatus for transversely spreading a web, such as a split web formed of a longitudinally uniaxially stretched film, includes a spreading means arranged in a travelling path of the web for transversely spreading the web. The spreading means comprises a curved rod-like member and projections arranged generally circumferentially about an axis of the curved rod-like member. The curved rod-like member is arranged so that the concave side is directed forward and the convex side is directed rearward, in the web travelling direction, and the projections are rotatable about the axis of the curved rod-like member at a speed higher than the travelling speed of the web. In one aspect, the curved rod-like member comprises a curved shaft and an outer tube arranged about the curved shaft and rotatable relative to the curved shaft, the projections being formed between the grooves cut on the outer tube. In another aspect, the projections are formed of a spring arranged about the curved rod-like member.

Abstract: A method for producing cyclopentadienes which comprises the step of cyclodehydration of an unsaturated carbonyl compound having a specific chemical structure in a vapor phase in the presence of a specific solid acid catalyst. The cyclopentadienes of the invention can be produced in a high yield from inexpensive starting materials through a simplified reaction process and are useful as intermediate compounds for organic synthesis.

Abstract: A controlled elastic composite material which is produced by forming a flexible elastomer layer or layers on one or both surfaces of at least one member selected from the group consisting of (a) a longitudinally monoaxially oriented reticular web, (b) a transversally monoaxially oriented reticular web, (c) a woven or non-woven fabric composed of monoaxially oriented tapes, and (d) a stretched long fiber web in which long fibers are aligned almost in one direction.

Abstract: A wholly aromatic polyester having excellent moldability, heat resistance and blistering resistance and a composition thereof are obtained from an aromatic polyester composed of six specified types of structural unit and having an optical melt anisotropy. The composition can provide electronic heater parts and oven-ware both excellent in mechanical strength, heat resistance, moldability and microwave oven resistance, and various other heat-resistant members. Molded articles made from this composition can be coated with fluorocarbon resin without the necessity for pretreatment such as heat treatment.

Abstract: A method for polymerizing or copolymerizing .alpha.-olefin in a vapor phase condition by supplying to a reactor a catalyst composed of a solid catalyst component containing at least titanium and/or vanadium as well as magnesium and an organic aluminum compound wherein the current due to the electric charge transferred from polymer particles electrified to an electrode disposed at a position where sheet-like polymers will be produced in a reactor, as a result of contact of the polymer particles in the reactor with the electrode is determined, and the polymerization or copolymerization is carried out under such condition where the mean value of current is zero or a positive value. As a result, it becomes possible to prevent production of sheet-like polymers and to stably continue the reaction for polymerization.

Abstract: A monoaxially oriented material of a longitudinally monoaxially oriented reticular web (a), a transversely monoaxially oriented reticular web (b) or a monoaxially oriented multi-layer tape (c) which comprises a polypropylene resin layer and an adhesive layer comprising a mixture of polypropylene resin and polyethylene resin and laminated on one surface or both surfaces of the polypropylene resin layer, and a polypropylene woven or non-woven fabric prepared by laminating crosswise or weaving the monoaxially oriented materials with interposing the adhesive layer so that the orientation axes of the materials may intersect; and a method for preparing the polypropylene woven or non-woven fabric and a heat-resistant reinforced laminate material.

Abstract: A method for manufacturing a rotary cutting tool for fabricating a sheet having transverse slits. The rotary cutting tool has a cylindrical body having generally longitudinally extending grooves, and cutting blades. The cutting blades are first fitted in the grooves with the cutting edges seated on the bottom surfaces of the grooves, and the base surfaces of the cutting blades projecting from the grooves are machined with a rotary grinding wheel while the cylindrical body is rotated. The cutting blades are then removed from the grooves and are finally fitted in the same grooves. The cutting edges of the cutting blades can be accurately arranged about an axis of the cylindrical body, and the rotary cutting tool can be easily manufactured.

Abstract: In the polymerization of olefins with a vapor phase fluidized bed reactor, the improvement comprises the steps of feeding seed polymer particles and the reaction is then started after feeding an organoaluminum compound on a prescribed basis, thereby avoiding the formation of sheet-like polymer in the initial period of the reaction and the lowering of the bulk density of the product polymer.

Abstract: In the preparation of polyolefin in a vapor phase polymerization using catalysts comprising a solid catalyst component containing titanium and/or vanadium; and magnesium and an organoaluminum compound, when the reaction is stopped for a certain period of time, the restarting of reaction is possible by feeding in the first place an organoaluminum compound into the reaction system with retaining of polymer particles in the reactor.

Abstract: In the polymerization of olefins using a catalyst comprising an organoaluminum compound and solid catalyst components containing titanium and/or vanadium; and magnesium in a vapor phase fluidized bed, the formation of sheet-like polymer and other abnormal conditions in the initial stage of the polymerization are avoided by means of previous drying of the reactor by feeding an organoaluminum compound prior to the feeding of seed polymer, the quantity of said organoaluminum compound being calculated by the following equation (I):A=k.multidot.V.sup. 2/3 (I)wherein A is the feed quantity (mol) of the organoaluminum compound, k is a coefficient (mol/m.sup.2) in the range from 0.15 to 4, and V is the volume (m.sup.3) of the whole system including gas circulation pipings.

Abstract: A process for producing polyolefin with a vapor-phase fluidized-bed reactor, wherein the reaction is started after filling the reactor with particles which contain moisture and/or molecular oxygen and can form a fluidized bed in order to prevent the formation of molten resin which is liable to occur at the start of the reaction and to attain a smooth operation of the reactor.

Abstract: A method of cooking edible foods by heating the foods on an electromagnetic cooker cover plate, formed by molding using a composition comprising a wholly aromatic, liquid crystalline polyester and a filler, said composition having a heat deformation temperature of not lower than 200.degree. C. at a load of 18.5 kg/cm.sup.2.

Abstract: A method for producing a lower alkyl acetate in which undesirable polymerization of the starting material of olefin and deterioration of catalyst can be avoided, a higher catalytic efficiency and a higher reaction rate are attained, the installation of reaction equipment is inexpensive and the operation of the reaction can be carried out without difficulty. The method of the invention comprises the steps of feeding acetic acid and an olefin both in a liquid state and in cocurrent through a continuous flow type fixed bed reactor containing an acidic ion exchange resin catalyst(s) under the conditions that the molar ratio of acetic acid to the olefin in a feed current is in the range of 1.0 to 2.0 and an LHSV of acetic acid relative to the catalyst layer is 0.1 to 10.0 with maintaining the inlet of the catalyst bed at 70.degree. C. to 120.degree. C.; cooling the obtained reaction mixture to a temperature not lower than 70.degree. C.; and recycling it to the catalyst bed.

Abstract: A method for the photodynamic therapy of rheumatoid arthritis of mammals, which agent comprises at least one member of fluorescent compounds selected from the group consisting of tetrapyrrole carboxylic acids having at least one carboxyl group, corresponding di- or tetrahydrotetrapyrrole carboxylic acids, and mono-, di- or polyamides of the tetrapyrrole carboxylic acids with amino-mono- or dicarboxylic acids and their salts.

Abstract: The present invention relates to provide a drawn optical transmission medium having excellent heat resistance and a continuous refractive index distribution in a good productivity at a low cost, and the disadvantages in a conventional synthetic resin optical transmission medium can be eliminated, which method is characterized by a step of crosslinking a polymer having a continuous refractive index gradient distributed from the peripheral portion to the central portion in its cross section and having a crosslinkable functional groups, after the step of heating and drawing.

Abstract: Provided is an abrasion-resistant composition comprising:(I) 100 parts by weight of a polymer component containing:(A) 50-90% by weight, based on the total polymer weight, of a polyolefinic resin having a maximum peak temperature (Tm) of higher than 125.degree. C. as measured by differential scanning calorimetry (DSC); and(B) 10-50% by weight, based on the total polymer weight, of a polyethylenic resin or rubber having a maximum peak temperature (Tm) of lower than 125.degree. C. as measured by DSC; and(II) 30-200 parts by weight of an inorganic flame retardant, said polymer component (I) containing 10.sup.-8 -10.sup.-3 gram equivalent based on 1 g of the polymers, of at least one functional group selected from:a: carboxyl group, an ester group thereof, or an anhydride group thereof,b: epoxy group,c: hydroxyl group,d: amino group,e: alkenyl cyclic imino ether group, andf: silane group.

Abstract: An improved tier sheet and method for producing the same. The tier sheet is suitable for use in conveying receptacles such as cans and bottles with palletizing and depalletizing operations and it can allow the smooth sliding of receptacles in loading and unloading and can avoid the slipping off of receptacles during conveying operation. The tier sheet comprises a first zone having a first frictional resistance and a second zone having a second frictional resistance, wherein the second frictional resistance is lower than the first frictional resistance. The method of the invention comprises a feeding means to feed a tier sheet material, a forming means to form the first zone and the second zone, and a cutting means to cut the formed tier sheet.

Abstract: A process for producing polyolefin with a vapor-phase fluidized-bed reactor, wherein the reaction is started after filling the reactor with particles which contain moisture and/or molecular oxygen and can form a fluidized bed in order to prevent the formation of molten resin which is liable to occur at the start of the reaction and to attain a smooth operation of the reactor.

Abstract: An MF capacitor of an oil impregnation type, whose durability in constant voltage application is so high that it is suitable for practical use. The metallized plastic film is impregnated with an electrically insulating oil composition obtained by adding 5-80% by weight of natural fatty acid triglyceride which contains a less amount of fatty acid ester having free hydroxyl radical to an aromatic hydrocarbon having a specific chemical structure and being liquid at -30.degree. C.