Abstract: A thermostable polymer electrolyte gel containing an acrylonitrile polymer, an electrolyte and a solvent, the acrylonitrile polymer having an acrylonitrile content of from 89 wt % to 98 wt % and meeting the following relationship:1,040,000-(A.times.10,000).ltoreq.B.ltoreq.1,490,000-(A.times.10,000)where A is the acrylonitrile content in wt % and B is the weight average molecular weight of the acrylonitrile polymer, the polymer electrolyte gel having an ion conductivity of 10.sup.-3 S/cm or higher at 20.degree. C., exhibiting the "retention of shape" in a thermostability test, and containing the acrylonitrile polymer in a proportion of from 3 wt % to 9 wt %. The thermostable polymer electrolyte gel can be produced by dissolving an acrylonitrile polymer and an electrolyte in a solvent to prepare a solution of the polymer, and cooling the polymer solution to a temperature of 0.degree. C. or lower.

Abstract: A system for the automatic dispensation of dye solutions characterized in that it is provided with a plurality of weighing devices for converting weight changes of dye solution materials supplied to receiving containers into electric signals. A control system for controlling the quantities of material supply, and for repeating a dispensing operation continuously for a plural number of times, the dispensing operation forming one cycle consisting of [I] setting the receiving container in a fixed position, [II] placing the receiving container onto the weighing device, [III] supplying the material to the predetermined receiving container and weighing the material, [IV] releasing the receiving container from the weighing device, and [V] transferring the receiving container. This system increases to a maximum, the range of the dye solutions that can be dispensed and the dispensing speed so as to reduce the cost and floor space occupied.

Abstract: Aromatic polyester fibers having high strength and high modulus of elasticity can be obtained stably for a long period of time by melt spinning by using a screw type extruder having a screw which has a compression ratio of 2.5 to 4.0 and thereby inhibiting entrapment in the resultant molten polyester of gases present in or on prowders, granules or pellets being melted, and by back pressure of the molten polyester sending gas generated by decomposition of the molten polyester to a back portion of the extruder, and then extruding and melt spinning the molten polyester at a temperature of 280.degree. C. to 420.degree. C.

Abstract: An optical communication cable with less breakage or damage during the preparation and handling which comprises an optical fiber strand, a tension-resistant material, and a synthetic resin coating layer, the tension-resistant material being provided between the optical fiber strand and the synthetic resin coating layer and being fibers obtained by melt spinning an aromatic polyester showing an anisotropy in the molten state.

Abstract: An aromatic polyester showing anisotropy in the molten state is melt spun stably for a long period of time by controlling an extrusion pressure at a nozzle portion to 3 kg/cm.sup.2 G or higher and an atmospheric temperature T.sub.N at a nozzle outlet to a degree satisfying the following formula: (T.sub.F -100).ltoreq.T.sub.N .ltoreq.T.sub.F, wherein T.sub.F is a flowing temperature of the aromatic polyester, and preferably controlling the pressure of a polymer melt at a tip outlet of an extruder to 15 kg/cm.sup.2 G or higher, whereby a highly orientated fiber of fine denier is obtained.

Abstract: The present invention provides chemically stable colloidal antimony oxide which has been treated with a particular organosilicon compound in the ratio of from 0.5 to 25 weight % based on the antimony and whose pH has been regulated to within the range of from 2 to 12.

Abstract: Polyacrylonitrile (PAN) fiber of high strength (tensile strength.gtoreq.20 g/d) produced from a polymer composed mainly of acrylonitrile (AN) and having a weight average molecular weight not less than 400,000, and a method of producing said fiber characterized by a multistage stretching step and a drying step under particular conditions.

Abstract: The invention provides a polyacrylonitrile fiber having a tensile strength above 13 g/d and a modulus of elasticity above 2.4.times.10.sup.11 dyne/cm.sup.2, which is useful for tire cords, fiber-reinforced composite materials, precursors for producing carbon fiber, etc. The fiber is produced by integrally combining technical means which comprise using a polymer composed mainly of acrylonitrile whose weight average molecular weight is more than 400,000 and Mw/Mn ratio is less than 7.0; preparing a spinning solution from the polymer; spinning the solution into filaments; subjecting the resulting filaments to multistage stretching; and drying the filaments, all these steps being conducted under particular conditions.

Abstract: A process for copolymerizing acrylonitrile (AN) with an amount of a monomer of a specific structure in an organic solvent which can dissolve AN but cannot dissolve polyacrylonitrile (PAN). The polymer dispersion in the solvent is stable upon storage. The dispersed particles of the polymer are uniform and fine, and are sufficiently prevented from agglomeration and agglutination.

Abstract: A gasket sheet obtained by the milling and vulcanization of 50-85% by weight of a fibrous material, 10-50% by weight of a rubber material and at least 1-23% by weight of a water-insoluble and -swelling substance. The gasket sheet may be a one layer or a three layer sheet.

Abstract: A process is provided for producing carbon fibers characterized by fixing a specified amount of a chemical substance onto thermally stabilized fibers and/or carbonized fibers to impart good collectivity and then carbonizing and/or graphitizing the fibers, said chemical substance selected from one or more of the compounds of glycerin, polyethylene glycol, polypropylene glycol and alkyl derivatives thereof.

Abstract: A process for producing polyacrylonitrile membranes for use in reverse osmosis, which comprises dissolving an acrylonitrile polymer in formamide (FA)-containing dimethylformamide (DMF) to prepare an acrylonitrile polymer solution for membrane formation; shaping the solution into a membranous product of a desired form while maintaining the temperature of the solution within a specific range; removing the solvent from the membranous product under a specified solvent removal condition (solidifying condition); subjecting the thus-obtained membrane to a heat treatment, and further to a plasma treatment. The polyacrylonitrile membrane thus obtained is asymmetric and porous in structure, and excellent both in separation ability and in mechanical strength. This membrane is very suitable for use in reverse osmosis.

Abstract: The present invention relates to a process for producing carbin fibers which involves thermally stabilizing and carbonizing or graphitizing acrylic fibers containing 0.1-5 weight %, based on the weight of the fibers, of a straight chain silicone substance and further containing 0.1-5 weight %, based on the weight of the fibers, of a chemical substance which is selected from glycerine, polyethylene glycol, polypropylene glycol, alkyl derivatives thereof, and mixtures or compounds of two or more of these substances, and which generates only a residue less than 5 weight % under the action of heat at 240.degree. C. for one hour. According to applicant's invention, such problems as fluffiness, spreading, filament breakage etc. can be greatly reduced and it is possible to produce fibers free from agglutination or fusion and having high strength and high modulus of elasticity by heat-treatment in a short time.