Abstract: A process for manufacturing a cycloolefin addition polymer includes polymerizing monomers containing a cycloolefin compound using a catalyst containing a nickel compound or a palladium compound by addition polymerization in the presence of a molecular weight controlling agent in two steps, that is a step of a initiating the polymerization reaction using the monomers in an amount of not more than 80 wt % of the total monomers and a step of supplying the remaining monomers to the reaction system during the polymerization reaction. A cycloolefin addition polymer with a uniform quality, having a narrow molecular weight distribution and a controlled molecular weight, and excellently balanced processability and mechanical strength can be obtained at a high polymerization conversion rate using the process. The process can be operated at a highly controlled polymerization temperature, and is thus suitable for industrially manufacturing a cycloolefin addition polymer.

Abstract: The present invention provides a method for producing a cyclic olefin addition copolymer wherein a monomer composition containing 5 to 80 mol % of a cyclic olefin having a substituent selected from alkyl groups, alkylsilyl group, and alkylsilylmethyl group represented by formula (1) below and 20 to 95 mol % of a cyclic olefin represented by formula (2) below is addition-copolymerized in the presence of a palladium-based multicomponent catalyst containing a specific palladium compound (i), a specific phosphorus compound (ii), and an ionic boron compound or an ionic aluminum compound (iii): (one of A1 to A4 is a C4-5 alkyl group, trimethylsilyl group, or trimethylsilylmethyl group, and the others each independently are a hydrogen atom, halogen atom, or methyl group) (B1 to B4 are each independently a hydrogen atom, methyl group, or halogen atom.

Abstract: A process for manufacturing a cycloolefin addition polymer includes polymerizing monomers containing a cycloolefin compound using a catalyst containing a nickel compound or a palladium compound by addition polymerization in the presence of a molecular weight controlling agent in two steps, that is a step of a initiating the polymerization reaction using the monomers in an amount of not more than 80 wt % of the total monomers and a step of supplying the remaining monomers to the reaction system during the polymerization reaction. A cycloolefin addition polymer with a uniform quality, having a narrow molecular weight distribution and a controlled molecular weight, and excellently balanced processability and mechanical strength can be obtained at a high polymerization conversion rate using the process. The process can be operated at a highly controlled polymerization temperature, and is thus suitable for industrially manufacturing a cycloolefin addition polymer.

Abstract: A composition comprising a cyclic olefin addition copolymer containing recurring units of the following formulas (1) and (2), and at least one compound selected from (A) a compound acting as an acid when heated to 50° C. or higher, (B) a metal compound of an alkoxy compound, aryloxy compound, carboxyl compound, &bgr;-diketone compound, halogen compound, or oxide, (C) an organic carboxylic acid, organic phosphoric acid, organic sulfonic acid, ammonia, primary to tertiary amine compound, or quaternary ammonium hydroxide compound. The composition exhibits excellent optical transparency, solvent resistance, dimensional stability, heat resistance, and adhesion to metals and inorganic materials, and suitable for use in optical transparent materials and electronic material parts, to a cross-linked product obtained by crosslinking the composition via siloxane bonds, and to a film, sheet, or coating made from the composition.

Abstract: A composition comprising a cyclic olefin addition copolymer containing recurring units of the following formulas (1) and (2), 1

Abstract: An ethylene copolymer rubber composition which comprises an ethylene copolymer rubber and at least one member selected from the group consisting of a vulcanizing agent and a cross-linking agent and optionally a conjugated diene rubber, said ethylene copolymer rubber being composed of ethylene, an .alpha.-olefin having 3 to 12 carbon atoms, a non-conjugated diene represented by the following structural formula (I): ##STR1## wherein R.sup.1 and R.sup.2 represent independently hydrogen atoms or alkyl groups having 1 to 8 carbon atoms, R.sup.3 represents an alkyl group having 1 to 8 carbon atoms, and n is an integer of 2 to 10, and an .alpha.,.omega.-diene represented by the following structural formula (II) :CH.sub.2 .dbd.CH--(CH.sub.2).sub.m --CH.dbd.CH.sub.

Abstract: A hydrogenated copolymer rubber which is a hydrogenation product of a random copolymer rubber consisting of:(A) 30-70 mole % of a unit derived from at least one monomer selected from the group consisting of alkyl acrylates and alkoxy-substituted alkyl acrylates,(B) 20-70 mole % of a unit derived from at least one conjugated diene, and(C) 0-10 mole % of a unit derived from at least one other ethylenically unsaturated compound copolymerizable with the components (A) and (B) [(A)+(B)+(C)=100 mole %] wherein at least 90% of the double bonds of the conjugated diene unit is hydrogenated; a crosslinkable rubber composition comprising said hydrogenated copolymer rubber and a crosslinking agent; and a thermoplastic polymer comprising said hydrogenated copolymer rubber and a thermoplastic resin. These rubbers and compositions are superior in low-temperature resistance, heat resistance, ozone resistance, mechanical strengths, compression set, impact resilience and oil resistance.

Abstract: A substantially random, linear vinylidene fluoride-acrylic acid ester copolymer comprising:(A) 5-85% by weight of a vinylidene fluoride unit,(B) 15-95% by weight of at least one unit selected from the group consisting of an alkyl acrylate unit and an alkoxy-substituted alkyl acrylate unit, and(C) optionally 10% by weight or less, based on the total weight of (A), (B) and (C), of a crosslinking monomer unit, and having an intrinsic viscosity of 0.01-10 dl/g as measured at 30.degree. C. in N,N-dimethylformamide. Said copolymer has not only excellent heat resistance, ozone resistance and sour gasoline resistance but also excellent resistance to gasoline permeation.

Abstract: A substantially random, linear vinylidene fluoride-acrylic acid ester copolymer comprising:(A) 5-85% by weight of a vinylidene fluoride unit,(B) 15-95% by weight of at least one unit selected from the group consisting of an alkyl acrylate unit and an alkoxy-substituted alkyl acrylate unit, and(C) optionally 10% by weight or less, based on the total weight of (A), (B) and (C), of a crosslinking monomer unit, and having an intrinsic viscosity of 0.01-10 dl/g as measured at 30.degree. C. in N,N-dimethylformamide. Said copolymer has not only excellent heat resistance, ozone resistance and sour gasoline resistance but also excellent resistance to gasoline permeation.

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 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 FM tuner comprising means for producing an intermediate frequency signal, a frequency discriminator circuit having "S" characteristics, a differential amplifier circuit, and detector means. The bias of said differential amplifier circuit is controlled in accordance with the direct current component of the output of said frequency discriminator circuit, and part of said intermediate frequency signal is passed to said detector means through said differential amplifier circuit, whereby that frequency position of said intermediate frequency signal which corresponds to the center of said direct current component is detected. Thus, it is possible to determine whether or not the FM tuner is in an optimum tuned state.

Abstract: An FM tuner comprising means for producing an intermediate frequency signal, a frequency discriminator circuit having "S" characteristics, a differential amplifier circuit, and detector means. The bias of said differential amplifier circuit is controlled in accordance with the direct current component of the output of said frequency discriminator circuit, and part of said intermediate frequency signal is passed to said detector means through said differential amplifier circuit, whereby that frequency position of said intermediate frequency signal which corresponds to the center of said direct current component is detected. Thus, it is possible to determine whether or not the FM tuner is in an optimum tuned state.

Abstract: An amplifier circuit comprising a differential circuit including means for preventing base bias voltages applied to driver transistors connected with the transistors constituting the differential amplifier from becoming unbalanced. Means is also provided which is adapted to prevent so-called shock noise from appearing at the output of the amplifier circuit. Such means may be constructed by using a delay circuit.

Abstract: Conjugated diolefinic polymers having a molecular weight of less than 1,000,000 can be produced at high polymerization rates and in high yields by polymerizing a conjugated diolefin or copolymerizing a conjugated diolefin with a vinyl aromatic hydrocarbon in the presence of an alfin catalyst, in which as a molecular weight regulator is used a halogenated unsaturated hydrocarbon represented by the formula, ##EQU1## wherein R is an alkyl group having 1 to 7 carbon atoms, a vinyl group, a phenyl group, an alkyl-substituted phenyl group, a halogen atom or a hydrogen atom, and X, Y and Z which may be same or different are individually a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms, at least one of the R, X, Y and Z being a halogen atom.