Abstract: A process for producing benzophenone tetracarboxylic dianhydride, which comprises adding benzophenone tetracarboxylic acid to a solvent comprising, as the main constituent, an organic compound having a boiling point of more than 100.degree. C. and being inert to benzophenone tetracarboxylic acid and benzophenone tetracarboxylic anhydrides, and heating the resulting mixture. This process enables one to produce benzophenone tetracarboxylic dianhydride having a very low moisture absorbency.

Abstract: There is disclosed acrylate-terminated oligomers which are radiation-curable and which can be pigmented with magnetizable power to cure on electron beam exposure to provide superior magnetic recording structures. These oligomers include sulfonic acid groups which improve pigment wetting and which can be included in amide-containing compounds.

Abstract: A multi-component copolymer rubber consisting essentially of (A) 20 to 69.5% by weight of a cyano-substituted alkyl (meth)acrylate, (B) 30 to 79.5% by weight of an alkyl acrylate, (C) 0.5 to 10% by weight of a crosslinkable monomer and (D) 0 to 10% by weight of other ethylenically unsaturated monomer copolymerizable with (A), (B) and (C), excels in heat resistance, ozone resistance, sour gasoline resistance and sour gasohol resistance. There properties of said multi-component copolymer rubber can further be improved by incorporating into the copolymer rubber a crosslinking agent, a metal salt, a vinylidene fluoride polymer, a vinyl chloride resin or other multi-component copolymer rubber.

Abstract: A heat-resistant copolymer obtained by copolymerizing (A) 72-82 parts by weight of .alpha.-methylstyrene and (B) 26-18 parts by weight of acrylonitrile, characterized in that the copolymer contains (a) 0-15% by weight of monomer chain --(A)--(A)--(A)--, (b) 50% by weight or more of monomer chain --(A)--(A)--(B)--, and (c) 50% by weight or less of monomer chain--(B)--(A)--(B)--, the total of (a), (b) and (c) being 100% by weight. This copolymer is excellent in heat stability and moldability when molded at high temperatures, and the blending of this copolymer with other thermoplastic resins gives thermoplastic resins with excellent heat resistance.

Abstract: A silicone elastomer composition which has novel crosslinking points comprises (A) 100 parts by weight of a polyorganosiloxane of a polymerization degree of at least 20, wherein the organic groups are selected from monovalent substituted and unsubstituted hydrocarbon groups and are attached to silicon atom, and at least two of the organic groups are monovalent hydrocarbon groups possessing at least five carbon astoms and a carbon-carbon double bond bonded to a silicon atom via at least one carbon atom, (B) 5 to 200 parts by weight of an inorganic filler having a specific surface area of at least 50 m.sup.2 /g, and (C) 0.1 to 25 parts by weight of a vulcanizer selected from the group consisting of sulfur, sulfur donor, substituted or unsubstituted alkylphenol resins, and quinoids.

Abstract: A resin composition comprising 100 parts by weight of a thermosetting resin and 1 to 100 parts by weight of a functional, rubbery copolymer containing among the monomer units which constitute the copolymer, at least one monomer containing a substituent selected from the group consisting of epoxy, hydroxyl, carboxyl and amino groups, said copolymer being prepared by one of three emulsion polymerization processes in which a nonionic surface active agent and/or ionic surface active agent is employed as the emulsifying agent.

Abstract: An optical product having a thin film on the surface which is obtained by subjecting a mixed gas of oxygen and a hydrocarbon compound having a double bond to plasma polymerization in the presence of an optical product, thereby forming on the surface of the optical product a thin film of a reaction product of said plasma polymerization. Said optical product having a thin film on the surface has excellent resistance to fogging due to adhesion of water drops when used in gas phase, excellent resistance to adhesion of air bubbles when used in liquid phase, high resistance to being stained by oils and fats and an excellent removability of stains due to oils and fats.

Abstract: A novel raddery organopolysilsesquioxane having lower alkyl groups and alkenyl groups as the side chains and, if necessary, having aryl groups and/or hydrogen atoms bonded as the side chains can be produced by adding water to a solution of a lower-alkyltrihalogenosilane, an alkenyltrihalogenosilane, and, if necessary, an aryltrihalogenosilane and/or a trihalogenosilane in an organic solvent, and heating the resulting mixture. The aforesaid organopolysilsesquioxane can be used for forming a patterned surface-protecting layer or insulating layer for a semiconductor device, in the form of a mixture with a compound which generates crosslinking-reaction-active species upon irradiation with light or an ionizing radiation.

Abstract: A multi-component copolymer rubber consisting essentially of (A) 20 to 69.5% by weight of a cyano-substituted alkyl (meth)acrylate, (B) 30 to 79.5% by weight of an alkyl acrylate, (C) 0.5 to 10% by weight of a crosslinkable monomer and (D) 0 to 10% by weight of other ethylenically unsaturated monomer copolymerizable with (A), (B) and (C), excels in heat resistance, ozone resistance, sour gasoline resistance and sour gasohol resistance. These properties of said multi-component copolymer rubber can further be improved by incorporating into the copolymer rubber a crosslinking agent, a metal salt, a vinylidene fluoride polymer, a vinyl chloride resin or other multi-component copolymer rubber.

Abstract: An ionizing radiation sensitive resist consisting essentially of a polymer having a recurring unit represented by the following formula: ##STR1## wherein X is a hydrogen atom, a methyl group, or a halogen atom and R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5, which may be identical or different, are hydrogen atoms, halogen atoms, alkyl groups having 1 to 3 carbon atoms, alkoxy groups having 1 to 3 carbon atoms, haloalkyl groups having 1 to 3 carbon atoms or haloalkoxy groups having 1 to 3 carbon atoms, at least a part of the X groups present in said polymer being a halogen atom, at least a part of the Y.sup.1 and Y.sup.2 group present in said polymer being a halogen atom, and at least a part of the R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 groups present in said polymer being a haloalkyl or haloalkoxy group having 1 to 3 carbon atoms. Said ionizing radiation sensitive resist is suitable as a negative type resist.

Abstract: A branched styrene-butadiene copolymer and a pneumatic tire using the same as a tread base rubber are disclosed. This copolymer is produced by coupling an active styrene-butadiene copolymer anion, which is obtained by polymerizing styrene and butadiene in a hydrocarbon solvent in the presence of ether or a tertiary amine and an initiator of an organolithium compound, with a tin halide compound. In the copolymer, the ratio of branched copolymer connected with tin-butadienyl bond is at least 20% by weight, and the content of bound styrene is not less than 3% by weight but less than 25% by weight, and the content of vinyl bond in butadiene portion is not less than 30% but less than 50%.

Abstract: An alkenyl aromatic compound-conjugated diene block copolymer having a combined alkenyl aromatic compound content of 25-95% by weight, characterized in that said copolymer is represented by the formula,A--B--Awherein A represents an alkenyl aromatic compound polymer block, the total amount of A's in both ends being 50-97% by weight of the total combined alkenyl aromatic compound content; B represents a conjugated diene-alkenyl aromatic compound copolymer block, said B portion having (a) 2-10 taper blocks where the amount of the alkenyl aromatic compound increases gradually and (b) a weight ratio of alkenyl aromatic compound/conjugated diene of 3-85/97-15; and the total amount of the chains that 1-4 alkenyl aromatic compound monomers are linked is 5-30% by weight of the total combined alkenyl aromatic compound content. Said copolymer is excellent in the balance of impact strength, tensile strength and elongation.

Abstract: A rubber composition consisting essentially of 5-99 parts by weight of a thermosetting resin and 94-1 parts by weight of one of the following functional rubber-like copolymers (I) to (III) having a Mooney viscosity ML.sub.1+4.sup.

Abstract: In a method of basting in the tailoring of clothes wherein an adhesive is used to secure the cloth, the improvement wherein said adhesive comprises as the main component a liquid, addition-reaction-type silicone polymer. Said basting method is applicable to basting interlinings and/or shoulder pads to front bodices, basting two back bodices and the like to simplify and automatize the tailoring process.

Abstract: A curing apparatus utilizing ultraviolet radiation for curing a coating over the surface of a line-shaped medium such as an optical fiber, comprising: a pair of reflecting mirrors, each of which has an elliptical mirror surface, the ratio between the major and minor axes of which is within a range from 1.02 to 1.35; a source for producing ultraviolet radiation having a tube which is disposed along a first focal axis of the pair of reflecting mirrors for emitting ultraviolet radiation and has a diameter within a range from 12 mm to 24 mm and a light emission length equal to or longer than 15 cm; and an ultraviolet radiation transmission hollow tube which is disposed along a second focal axis of the pair of reflecting mirrors and through which the line shaped medium is passed in the axial direction of the hollow tube. The ultraviolet radiation emitting tube is air-cooled.

Abstract: A loud speaker assembly including members which are bonded together with an adhesive compound, wherein the adhesive compound comprises at least one composition selected from the group consisting of alkyl acrylate, alkyl methacrylate, acrylic acid and methacrylic acid; a copolymerized elastomer including at least 5 percent by weight of a functional monomer, an unsaturated nitrile and at least one of butadiene and isoprene; and an organic peroxide.

Abstract: A diene polymer produced by polymerizing a conjugated diene monomer in a solvent solution of an active lithium-terminated polymer in the presence of a catalyst consisting of (A) a cobalt compound and (B) carbon disulfide and/or phenylisothiocyanic acid. The diene polymer comprises a 1,2-polybutadiene portion having a high percentage of vinyl conformation. The diene polymer has substantially no mercaptan compound.

Abstract: A dynamic viscoelasticity measuring apparatus of torsional vibration type comprising a driving portion for converting a rotary movement to a rotary vibratory movement having a driving shaft having an eccentric end for rotation at an isometric velocity, a driven shaft supported at a right angle to said driving shaft for rotation, an intermediate arm revolving along the side of a cone having a top at the point of intersection of the center line of said driving shaft and the center line of said driven shaft disposed at right angles to each other and a bottom at a circle described by the eccentric end of the driving shaft, and connecting means for operatively connecting opposite ends of said intermediate arm to said driven shaft and said driving shaft and a driving dice for imparting vibration to a specimen, dynamic viscoelasticity of which is to be measured, through said swinging shaft, said vibration having an approximately sinusoidal waveform with complete symmetry.

Abstract: A process for purifying a rubbery polymer by removing a catalyst residue from a rubbery polymer containing the catalyst residue obtained by polymerizing in slurry ethylene and an .alpha.-olefin or ethylene, an .alpha.-olefin and a non-conjugated diene in a poor solvent with a catalyst consisting of an organoaluminum compound and a transition metal compound, characterized in that the removal of the catalyst residue is conducted by water extraction consisting of(1) adding a good solvent and a surface active agent to the polymer slurry in the first step, and(2) adding water to the slurry obtained in above (1) in second step.This process enables the catalyst residue to be removed from EPDM in a very high efficiency.

Abstract: A method for inspecting printed wiring boards which comprises superposing, on a printed wiring board to be inspected, a pressure-sensitive, electroconductive, elastic sheet, any portions of which become electroconductive in the direction of thickness of the elastic sheet when the portions have been pressed in the same direction, pressing the elastic sheet at portions corresponding to the electroconductive portions of said board by the use of inspecting electrodes, thereby electrically connecting the corresponding inspecting electrodes to the intended electroconductive portions of the printed wiring board.