Abstract: An electrofusion joint used as a pipe joint for plastic pipes, wherein a coil electric heating wire is embedded inside and it is heated by application of an electric current after insertion of the plastic pipes to cause fusion/adhesion at the contact surface therebetween. The characteristic feature is to use one or more means of items (a) to (c) below to improve adhesion of the coil and the resin constituting the joint:(a) To use adhesive resins for the resin constituting the joint.(b) To provide a coil with the surface substantially not oxidized.(c) To cover the surface of the coil with a substance which has an affinity to both the resin and the coil.

Abstract: This invention provides a wafer processing film comprising a base film having a Shore D hardness of 40 or less and an adhesive layer disposed on one surface of the base film. In grinding the surfaces of wafers such as silicon and similar wafers, breakage can be prevented by affixing the wafers to the adhesive layer of the processing film and then grinding them.

Abstract: Actuator for locking device of doors and trunks of automobiles comprising a rotating member that is rotated by a power source; a cam groove formed in the rotating member; a cam follower that moves along the cam groove;anda displacement member which moves between a first position and a second position as a result of the movement of the cam follower. If the cam follower should stop in a communicating groove, the disk can be rotated by a small motor or the cam follower can be operated normally under circumstances when the motor fails.

Abstract: Disclosed is a process for producing a modified ultrahigh-molecular-weight polyolefin composition, which comprises mixing a powder of an ultrahigh-molecular-weight polyolefin (A) having an intrinsic viscosity of at least 5 dl/g, a flowability improver (B) having a melting point lower than the melting point of the ultrahigh-molecular-weight polyolefin (A), a monomer (C) having an olefinically unsaturated bond and a radical initiator (D) with stirring at the melting point of the flowability improver (B) or a higher temperature but below the melting point of the ultrahigh-molecular-weight polyolefin (A), and then melt-kneading them at the melting point of the ultrahigh-molecular-weight polyolefin (A) or a higher temperature to react the monomer (C) with the ultrahigh-molecular-weight polyolefin (A).

Abstract: A crude drug ingredient having bactericidal activity incorporated into a curable composition comprising a (meth)acrylate type monomer, a polymerization initiator and if necessary a filler to formulate the ingredient into the drug having sustained release property. The curable composition containing the crude drug ingredient is applied to a defective part of a tooth or an artificial gum for preventing dental diseases such as carious tooth, pyorrhea alveolaris, and the like.

Abstract: An aromatic polyamide is produced by subjecting an aromatic diisocyanate and an aromatic dicarboxylic acid to polycondensation in the presence of an alkali metal compound and/or an alkaline earth metal compound as a catalyst in an aprotonic polar solvent. The aromatic polyamide can be rendered suitable for use in the production of high-tenacity fibers by charging in advance the solvent, aromatic dicarboxylic acid and catalyst in a mixing system, reducing the water content in the mixing system to at least 50 ppm and then introducing the aromatic diisocyanate to conduct the polycondensation.

Abstract: A method of vaporizing and removing a binder from a powder-molded product containing the binder, which method comprises:coating the greater part of the surface of said powder-molded product with a thin resin film having air-tightness thereby leasing an exposed surface portion;pressurizing the thus-coated surface portion of the pressure-molded product hydrostatically;vaporizing the binder in the power-molded product under said hydrostatic pressurization; andremoving the vaporized binder to the exterior of the power-molded product through said exposed surface portion not coated with the thin film.

Abstract: The solid catalyst of this invention for olefin polymerization comprises a compound of a transition metal of Group IV of the periodic table and an aluminoxane as catalyst ingredients. The catalyst is characteristic in that it has a high specific surface area, and shows very high polymerization activity on the homopolymerization or copolymerization of olefins. Polymers obtained by using the catalyst of the invention have a high bulk density, a uniform particle size, a low fine powder content and a narrow molecular weight distribution, and in the case of copolymers, a narrow composition distribution as well.

Abstract: A polyaminobisimide resin composed of an unsaturated bisimide and a diamine which employs 1,3-bis and/or 1,4-bis(2-p-anilinopropylidene) benzene as a diamine component, when cured and used in a laminate, exhibit improved ply separation strength and water absorption.

Abstract: A hydrogenation catalyst which is prepared by adsorbing ruthenium ions on a hydrotalcite (i.e. an anionic clay mineral) and/or a compound capable of conversion to a hydrotalcite structure by hydration, and then reducing said adsorbed ruthenium ions. The catalyst suitable for use in a process by which a monocyclic aromatic hydrocarbon is partially reduced to produce cyclohexene.

Abstract: A block copolymer of propylene can be obtained with its quality controlled uniform by conducting at first continuous polymerization of propylene in a polymerization system, receiving a polymer slurry, which has been discharged continuously from the polymerization system, in a batchwise polymerization tank, feeding ethylene to the tank to conduct batchwise polymerization of ethylene and propylene. Upon discharge of a copolymer slurry formed by the preceding batchwise polymerization, at least a predetermined amount of unreacted ethylene is left over in the tank. Into the tank with the unreacted ethylene still left over therein, there are simultaneously charged the polymer slurry from the polymerization system and a deactivator. During this charging, ethylene is not supplied.

Abstract: A liquid polymer composition contains:(A) a liquid low molecular weight ethylene-.alpha.-olefin copolymer comprising 30 to 70 mol % of ethylene component units and 30 to 70 mol % of .alpha.-olefin component units, having a number average molecular weight (Mn) in the range of 150 to 10000, with a Q-value (weight average molecular weight/number average molecular weight) of 3 or less, and(B) A high molecular weight polymer which is in an amount of 0.05 to 100 parts by weight based on 100 parts by weight of the liquid low molecular weight polymer (A), having a number average molecular weight (Mn) of 20000 or higher, witha Q-value of 6 or less, and is soluble in the liquid low molecular weight polymer (A), which liquid polymer composition has an excellent viscosity characteristic, lubrication characteristic, and oxidation stability, without denaturation by moisture adsorption, and therefore, is suitable for use as an actuation oil.

Abstract: A process for producing a porous film having practically sufficient mechanical strengths, good flexibility, uniform fine pores and high moisture vapor permeability, and further an extremely thin porous film, which process comprises blending 30 to 80 parts by weight of an inorganic fine powder having a specific surface area of 15 m.sup.2 /g or less and an average particle size of 0.4 to 4 .mu.m with 20 to 70 parts by weight of a polyolefin resin, followed by melt-molding the resulting blend into a film and then stretching the film to 2 to 7 times the original length at least in the uniaxial direction.

Abstract: A gas-permeable porous film which is prepared by stretching a film made from a mixture containing a polyolefin resin and an inorganic filler at least uniaxially and possesses a rugged pattern on its surface. One process for producing the film comprises forming the aforesaid mixture into a film, providing on the surface of the film a rugged pattern, stretching the resulting film at least uniaxially, and forming on the stretched film thus-formed a rugged pattern by means of a heated emboss roll and simultaneously allowing the stretched film to contract.

Abstract: A plunger pump comprises a cylinder (1); a plunger (2) reciprocating within said cylinder; a sucking chamber (1a) formed upon a top of said plunger; a sucking pipe (4) and a discharge pipe (5) communicated with said sucking chamber; and slidable means (1b) formed upon an inner wall of said cylinder in the proximity of an open end thereof. The sucking chamber and the slidable means are intercepted from each other by an intercepting fluid stream formed therebetween, thereby any contaminants occurring from the slidable means are prevented from being penetrated into the sucking chamber, and discharged outside the plunger pump together with the intercepting fluid stream.

Abstract: Aromatic polyamide having good high-temperature resistance and processing ability is obtained by specifying the ratio of storage modulus at the glass transition temperature (Tg).degree.C. to that of (Tg+100).degree.C.

Abstract: This invention is a catalyst for polymerization of olefins, comprising a compound of a transition metal of Group IVB of the periodic table, an aluminoxane and a particulate organic or inorganic compound carrier.This catalyst shows very high activity in the polymerization and copolymerization of olefins and gives polymers having a high bulk density, a uniform particle size, a low content of fine particles and a narrow molecular weight distribution and in the case of copolymers, a narrow composition distribution as well.

Abstract: Hexamethylene diisocyanate (HDI) is prepared by introducing a hexamethylenediamine (HDA) solution and an equivalent amount or more of hydrogen chloride gas simultaneously into a turbulent zone in the vicinity of an agitating blade in an inert organic solvent held under agitation within a tank-shaped reactor and allowing them to undergo a successive salt-forming reaction so as to obtain a high-concentration slurry of hexamethylenediamine hydrochloride (HDA.multidot.HCl) and then reacting the slurry with phosgene. The phosgenation is effected by charging an HDA.multidot.HCl slurry of a high concentration, such as that obtained by the above process, into a tank-shaped reactor held under a pressure above the atmosphere pressure but below 5 kg/cm.sup.2 G and controlling the amount of phosgene, which is to be blown into the reactor, at a level 1-18 molar times per hour the total amount of HDA.multidot.HCl and HDI in the reaction mixture.

Abstract: A curable composition is provided, comprising a monofunctional (meth)arcylate monomer, a poly functional (meth)acrylate monomer, a (meth)acrylate monomer containing an acidic group and at least one (meth)acryloyloxyl group in its molecule, a monofunctional (meth)acrylamide monomer, and a trialkylboron and/or a partial oxide thereof. The composition has improved low-temperature curability at approximately room temperature and water-resistant adherence, and excellent adhesiveness to tooth substances including enamel and dentin and dental alloys, and gives no adverse influence of stimulation to dental pulp. Most preferably, the composition is used as a bonding agent for dental composite resins.

Abstract: An apparatus for draining condensate from vapor equipment comprises a cylindrical casing connected in fluid communication with the vapor equipment and defining a flow path for conveying vapor and condensate, an orifice disk disposed in the casing to traverse the flow path and having a plurality of orifices formed therein, and at least one partition disposed in the casing upstream or downstream of the orifice disk with a predetermined spacing therefrom, the partition covering a predetermined portion of the flow path. The structure is applicable to a variety of valves including sluice and ball valves.