Abstract: A rubber composition including (i) a partially hydrogenated unsaturated nitrile-conjugated diene copolymer having an iodine value not larger than 120, (ii) an ethylene-propylene copolymer and (iii) a material selected from an ethylene-vinyl acetate copolymer, an acrylic rubber and a halogenated butyl rubber. The rubber composition prodides a vulcanized rubber having an improved constant-elongation fatigue performance, as well as balanced thermal resistance, oil resistance and other properties.

Abstract: A process for preparation of latex of a hollow polymer which comprises adding a base, in the presence of a monomer, to latex containing carboxy-modified copolymer particles to make the pH of the latex 8 or more; adding a carboxyl group-containing monomer to make the pH of the latex 7 or less; and then polymerizing these monomers.

Abstract: A temporary pacing catheter having an integrally attached temporary pacemaker function is disclosed. The pacemaker integrally built in this catheter for temporary pacing has a very small size and can be fixed to the body of a patient, and therefore, the patient can be transferred conveniently. Furthermore, if this catheter is packaged in the sterilized condition, problems or another's help required for the connection of the catheter to the pacemaker and the like operations in the conventional technique can be avoided, and therefore, the packaged catheter is suitably used for an emergency treatment. Moreover, if a balloon is attached and arranged so that when the balloon is inflated, the balloon envelopes an electrode at the distal end, the catheter can be caused to flow in the heart and blood vessel safely and promptly.

Abstract: A method of production of a plastic laminate having a protective layer on a foamed layer comprising coating plastisol containing a vinyl chloride resin or an acrylic resin having epoxy group and having average particle diameter of 0.05 to 5 mm and plasticizer as the essential components on the surface of vinyl chloride resin layer containing an organic foaming agent, then forming the combined layers by heating and foaming is provided. A plastic laminate having a protective layer of polyvinyl chloride having excellent surface strength, abrasion resistance and resistance to chemicals on a foamed layer can be produced efficiently.

Abstract: A method of production of polyvinyl chloride resin for paste processing comprises recovering in 98% or more the polyvinyl chloride resin from an aqueous dispersion of the polyvinyl chloride resin for paste processing as aggregates by adding an organic fluid which is at most barely soluble in water and does not dissolve or swell the polyvinyl chloride resin to the aqueous dispersion in the presence of an aggregating agent, followed by separating the aggregated polyvinyl chloride resin particles from the aqueous phase of the aqueous dispersion. By the addition of the aggregating agent, dispersion of the resin particles into a medium is improved, fluidity of a sol thereof and the physical properties of molded articles formed therefrom are improved and blocking during the drying process is prevented.

Abstract: Disclosed herein is an adhesive composition comprising (A) 100 parts by weight of at least one rubber component selected from the group consisting of unsaturated nitrile-conjugated diene copolymer rubbers prepared by an aqueous suspension polymerization, containing 10-45 wt. % of unsaturated nitrile units in their polymer chains and having a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 30-100, and hydrogenated unsaturated nitrile-conjugated diene copolymer rubbers obtained by hydrogenating at least part of carbon-carbon double bonds in each of the unsaturated nitrile-conjugated diene copolymer rubbers, and (B) 50-500 parts by weight of at least one thermosetting resin selected from the group consisting of phenolic resins and epoxy resins.

Abstract: There are provided an acrylate polymer elastomer containing a particular acrylic ester unit as a constitutive component, and a vulcanizable composition comprising the elastomer and a vulcanizing agent.The acrylate polymer elastomer is obtained by copolymerizing(a) 45 to 89.9 wt. % of a monomer represented a by the formula ##STR1## wherein R.sup.1 represents an alkyl group having 1 to 8 carbon atoms, and/or a monomer represented by the formula ##STR2## wherein R.sup.2 represents an alkylene group having 1 to 8 carbon atoms and R.sup.3 represents an alkyl group having 1 to 8 carbon atoms,(b) 10 to 35 wt. % of a monomer represented by the formula t,0012wherein R.sup.4 represents a hydrogen atom or a methyl group, R.sup.5 represents a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms, and n represents an integer of 1 to 5,(c) 0.1 to 10 wt. % of crosslinkable monomer, and(d) 0 to 30 wt. % of a monoethylenic unsaturated monomer copolymerizable with the above(a) , (b) and (c) components.

Abstract: A vulcanizable elastomer composition comprising an epoxy group-containing elastomer, and blended therewith(1) an organic compound having at least two bonds of the formula --C(X)'NH--C(Y)--, wherein X and Y are both oxygen or sulfur, or one of X and Y is oxygen and the other is sulfur, in the molecule,(2) a quaternary compound selected from quaternary ammonium salts and quaternary phosphonium salts, andoptionally, (3) a compound having one >N--C(Z)--N<bond wherein Z represents an oxygen or sulfur.

Abstract: A thermoplastic norbornene based molded article which can be used as a substrate for liquid crystal display having an excellent performance; said substrate having a specified surface roughness of 0.05 .mu.m or less, and a liquid crystal display produced therefrom.

Abstract: A non-magnetic one-component developer comprises a binder resin and a colorant, and has a volume-average particle diameter (dv) in a range of 5-15 .mu.m, a ratio (dv/dn) of the volume-average particle diameter (dv) to the number-average particle diameter (dn) in a range of 1.00-1.40, a quotient (Sc/Sr) obtained by dividing the area (Sc) of a circle supposing the absolute maximum length of a particle is a diameter by the real projected area (Sr) of the particle in a range of 1.00-1.30, a product (AxdnxD) of the specific surface area (A) (m.sup.2 /g) as measured in accordance with the BET method, the number-average particle diameter (dn) (.mu.m) and the true specific gravity (D) in a range of 5-10, and a ratio (Q/A) of the charge level (Q) (.mu.c/g) to the specific surface area (A) in a range of 80-150. The developer is substantially spherical from both conditions of Sc/Sr and AxdnxD, and is suitable for use in a development process in which cleaning is conducted at the same time as development.

Abstract: There is provided a tubular connector to connect first and second fluid tubes wherein separately formed first and second tubular sections are jointed together with a built-in artificial valve in the inside fluid path.

Abstract: A magnetic recording medium comprises a non-magnetic support on which is coated a magnetic layer. The magnetic layer contains a ferromagnetic powder dispersed in a binder. The binder comprises a styrene copolymer or an acrylic copolymer, respectively containing both of (i) an epoxy group and (ii) at least one hydrophillic group, such as a strong salt group or a tertiary ammonium salt group. The magnetic recording medium exhibits excellent recording density and S/N ratio, causes no environmental pollution, because of the absence of generation of hydrochloric acid on incineration of the magnetic recording medium for disposal after use. The magnetic recording medium is favorably utilized for magnetic tapes, magnetic sheets, magnetic discs and like products.

Abstract: A polyvinyl chloride plastisol composition is provided, which contains as essential components (A) polyvinyl chloride resin particles prepared by microsuspension polymerization of vinyl chloride in the presence of a polymethyl methacrylate resin soluble in vinyl chloride and having polymethyl methacrylate resin localized on the surfaces of the resin particles, and (B) a plasticizer, and which has excellent thermal stability and stability with time of viscosity. The composition can be used advantageously as a material for use in processing procedures in which heat accumulates in plastisol being retained, for example, in slush processing, dip processing, etc. or for use in coating processing in which adhesiveness is required.

Abstract: The present invention provides a magnetic recording medium comprising a non-magnetic substrate and a magnetic layer formed on a substrate, comprising (a) a binder containing a vinyl chloride resin having sulfoxide groups and (b) a magnetic powder dispersed in the binder (a); and a binder used in said medium for dispersion of magnetic powder, containing a vinyl chloride resin containing sulfoxide groups. The present invention further provides a process for producing said vinyl chloride resin (a binder resin) having sulfoxide groups. The use of the binder resin of the present invention makes it possible to obtain a magnetic coating in which a fine magnetic powder is dispersed stably and which has good coatability. The magnetic recording medium obtained using the magnetic coating has good surface smoothness and good surface durability and is excellent in travelling, magnetic property and electromagnetic conversion property.

Abstract: A process for preparation of a rubber composition which comprises mixing a modified diene polymer wherein at least one functional group represented by the formula >C.dbd.N.sup.+ < was bound to the main chain of the polymer or the main chain and terminal of the polymer directly or through another atomic group, with carbon black in an organic solvent, and separately the mixture of the modified diene polymer with carbon black from the resultant mixture solution.

Abstract: There is provided a vulcanizable rubber composition comprising(a) 100 weight parts of a polymer component comprising 10 to 40 wt. % of an ethylenically unsaturated nitrile-conjugated diene highly saturated copolymer rubber wherein the content of the conjugated diene unit in the polymer chain is 30 wt. % or less and 90 to 60 wt. % of a polyethylenic polymer,(b) 10 to 80 weight parts of a metal salt of an ethylenically unsaturated carboxylic acid, and(c) 0.2 to 10 weight parts of an organic peroxide.This composition gives a vulcanized rubber excellent not only in ozone resistance but in low temperature resistance and strength characteristics.

Abstract: The present invention relates to a process for bonding a molded article of a thermoplastic saturated norbornene resin in which when the molded article is bonded to an adherend widely different from the molded article in coefficient of linear expansion, the adhesion surface of the molded article and that of the adherend are stuck together with an adhesive composed mainly of an epoxy resin which has an elasticity (Shore hardness D: about 40 or less) imparted by modification with a polymer having reactive silyl groups, and then the adhesive is cured. Thus, there is provided such an excellent bonding process that the adhesive strength is hardly deteriorated by a temperature change.

Abstract: Disclosed herein is a positive resist composition comprising an alkali-soluble phenolic resin and a photosensitive agent, characterized in that the positive resist composition contains, as the photosensitive agent, the quinonediazide sulfonate of at least one of phenolic compounds represented by the following general formulae (I) and (II): ##STR1## wherein R.sub.1 through R.sub.4 mean individually a hydrogen or halogen atom, a hyaroxyl group, an alkyl or alkenyl group having 1-3 carbon atoms, or a hydroxyalkyl group having 1-3 carbon atoms and may be equal to or different from one another, and R.sub.5 denotes a hydrogen atom, an alkyl or alkenyl group having 1-3 carbon atoms, or an aryl group with the proviso that the number of hydroxyl groups is 3 or 4; and ##STR2## wherein R.sub.6 through R.sub.9 mean individually a hydrogen or halogen atom, an alkyl or alkenyl group having 1-3 carbon atoms, or a hydroxyalkyl group having 1-3 carbon atoms and may be equal to or different from one another, and R.sub.

Abstract: A difluorinated hydrocarbon compound represented by the general formula (1) is reacted with cobalt trifluoride to give a trifluorinated hydrocarbon compound represented by the general formula (2), wherein R represents lower alkyl and R' and R" represent each hydrogen, halogen or lower alkyl which may be halogenated. The reacton proceeds under mild conditions to yield the objective compound with high selectivity.

Abstract: A molded article, particularly for optical use, formed of a thermoplastic saturated norbornene-based polymer composition including a thermoplastic saturated norbornene-based polymer excellent in heat resistance, etc., and a filler, the composition being capable of preventing cracks even when an insertion part having a linear expansion coefficient greatly different from that of the polymer is present and a thermal change occurs. The filler is selected from a fibrous filler and a combination of a fibrous filler with a powdery filler.