Abstract: Disclosed herein is a rubber composition for use in vibration insulating material, which comprises as rubber components 5-50 parts by weight of a copolymer consisting of 99.5-45% by weight of a conjugated diolefin, 0.5-30% by weight of an ethylenically unsaturated carboxylic acid and 0-40% by weight of another vinly monomer polymerizable therewith, and 50-95 parts by weight of at least one rubber selected from natural rubber and synthetic diene rubbers. This rubber composition is excellent in the breaking properties and vibration insulating properties with a small temperature dependence of hysteresis loss.

Abstract: A UV-ray curable resin composition comprising a polyurethane derived from a polyether polyol and a diene polymer having hydroxyl group, said polyurethane having polymerizable double bond different from the carbon-carbon double bonds contained in said diene polymer having hydroxyl group, and a coated optical fiber having a coated layer comprising the cured product of said resin composition. This composition has good coating characteristics, and the cured product thereof has small modulus over a wide temperature range and good hydrolysis resistance, and water absorption resistance. The coated optical fiber has small transmission loss over a wide temperature range and has high strength even in water.

Abstract: The present invention concerns a process for producing a novel polymeric thin film having high density, high hardness and high toughness on the surface of a substrate by plasma polymerization. This process comprises providing a gas containing at least one compound selected from halogenated alkanes, alkanes, hydrogen and halogens in specific combinations for plasma polymerization, the atomic ratio of halogen/hydrogen in the aforesaid gas being 0.1 to 5 and the electron temperature of the plasma in the reaction zone being 6,000.degree. K. or higher and lower than 30,000.degree. K. The polymeric thin film obtained is useful on various articles for the purpose of protection, surface hardening, rust proofing, scratch proofing, providing gas barrier, etc. In particular, it is suitable as the protective film of magnetic recording media.

Abstract: Disclosed herein is a rubber composition comprising at least 20% by weight of styrene-butadiene copolymer based on the total weight of the rubber content. The styrene-butadiene copolymer is obtained by randomly copolymerizing styrene with 1,3-butadiene in a hydrocarbon solvent in the presence of an organolithium compound as an initiator and then subjecting to a coupling reaction with a polyfunctional coupling agent, and contains 30-70% by weight of branched polymers therein, and has the following properties:(a) a content of bound styrene in the copolymer 3-15% by weight;(b) a content of vinyl bonds contained in the butadiene units is 15-30% by weight;(c) a Mooney viscosity (ML.sub.1+4.sup.100.degree. C.) is 15-50; and(d) a molecular weight distribution of the copolymer is bimodal at a ratio Mw/Mn of 1.4-2.2 in which Mw is a weight-average molecular weight and Mn is a number-average molecular weight.

Abstract: A cyclic sulfur compound represented by the formula, ##STR1## wherein R is --CH.sub.2 CH.sub.2 O).sub.n CH.sub.2 CH.sub.2 --, m is an integer of 2 to 4 and n is an integer of 1 to 3 is novel and can be used as a crosslinking agent instead of sulfur per se and also as a monomer for preparing polysulfide polymer. Said cyclic sulfur compound can be produced by reacting a metal sulfide represented by the formula, ##STR2## wherein R is the same as defined above, R' and R" are independently selected from alkyl groups and aryl groups and M is silicon or tin, with a halogen, sulfur dichloride or sulfur monochloride.

Abstract: A pressure sensitive conductor comprising an elastomer containing from 3 to 40% by volume of electrically conductive magnetic particles, which particles are dispersed in the elastomer so that high-sensitivity pressure sensitive conductor portions and insulator portions or low-sensitivity pressure sensitive conductor portions are both present therein. A method of manufacturing the pressure sensitive conductor comprises forming a sheet of a mixture containing electrically conductive magnetic particles in an elastomer, and subjecting the sheet to the action of magnetic fields before or during cross linking, thereby allowing the conductive magnetic particles to be uniformly dispersed in the sheet in a selected pattern.

Abstract: A process for producing a 5-alkylidenenorbornene, which comprises subjecting a 5-alkenylnorbornene to catalytic reaction in the presence of ammonia and at least one alkali metal hydride selected from the group consisting of lithium, sodium and potassium hydrides. By using said alkali metal hydride supported on a carrier, the above-noted isomerization can be efficiently carried out with a relatively small amount of the catalyst.

Abstract: A process for ortho-para-hydrogen conversion characterized by the use as a catalyst of a sulphur-containing semiconductive polymer produced by the dehalogenation of a poly(tetrahalophenylene sulphide) in the presence or absence of an organic solvent at 150.degree.-500.degree. C.

Abstract: A stripping liquor composition consisting essentially of (A) at least one compound selected from among sulfonic acids, acid esters of sulfuric acid, and acid esters of phosphoric acid, (B) hydrogen peroxide, and (C) at least one of organic solvents, with or without the addition of (D) at least one of polyhydric alcohols.

Abstract: A process for preparing alkali metal dispersions comprises continuously feeding a molten alkali metal, a dispersing agent, and an inactive dispersion liquid to a multipass emulsifier to form an emulsion of the molten alkali metal, and rapidly cooling the emulsion to a temperature at least 10.degree. C lower than the melting point of the alkali metal.

Abstract: A method of measurement of relaxation phenomena, in which input signals representing a relaxation phenomenon are recorded at equal intervals for logarithmic values of time.A measuring device for relaxation phenomena which comprises a logarithmic time pulse oscillator for producing pulse signals at equal intervals for logarithmic values of time, and a recorder for recording input signals representing a relaxation phenomenon converted into an electrical quantity, which operates to perform recording each time a pulse signal is produced.

Abstract: A highly weather-resistant, thermoformable sheeting prepared by mixing from 45 to 70 parts by weight of a rigid thermoplastic resin selected from the group consisting of polyvinyl chlorides and copolymers each of which is composed mostly of a vinyl chloride and a small amount of a monoolefinic monomer copolymerizable with the vinyl chloride, from 20 to 50 parts by weight of a thermoplastic resin obtained by a graft polymerization of from 20 to 40 parts by weight of an ethylene-propylene copolymer rubber or ethylene-propylene-diene terpolymer with from 60 to 80 parts by weight of a vinyl monomer mixture consisting of from 40 to 90 percent by weight of an alkenyl aromatic compound and from 10 to 60 percent by weight of at least one monomer copolymerizable with the alkenyl aromatic compound, and from 5 to 35 parts by weight of an acrylonitrile-butadiene rubber, with from 5 to 50 parts by weight of a plasticizer or plasticizers added to the 100 parts by weight of the resinous mixture.

Abstract: Solvent-developed type photosensitive compositions containing as an essential ingredient at least one selected from the group of the cyclization product of butadiene polymer or copolymer and organic solvent, with or without at least one member selected from the group consisting of photosensitizer and photosensitive crosslinking agent, both soluble in an organic solvent.

Abstract: A flame-retardant polymer composition comprising a flame-retardant polymer and a different kind of a polymer, the amount incorporated of the flame-retardant polymer being 2 to 50 percent by weight based on the different polymer and said flame-retardant polymer being prepared by copolymerizing 2 to 100 percent by weight of a monomer represented by the following general formula (A) ##SPC1##wherein R.sup.1 and R.sup.2 stand for H or CH.sub.3, R.sup.3 is a linear or branched alkylene group having 2 to 6 carbon atoms, which may be substituted by a hydroxyl group, X designates Br or Cl, n is a number of from 3 to 5, and m is a number of from 0 to 1,With 98 to 0 percent by weight of at least one unsaturated compound copolymerizable with the monomer (A).