Abstract: The invention provides a metallocene compound and an olefin polymerization catalyst for use for a catalyst for producing an olefin polymer having a sufficiently high molecular weight while maintaining excellent copolymerizability at a polymerization temperature and under polymerization conditions industrially advantageous in polymerization of an olefin such as ethylene or the like, and provides a method for producing nan olefin polymer using the catalyst.

Abstract: A polyethylene based resin exhibiting excellent moldability and durability and having an excellent balance between impact resistance and stiffness; and a hollow plastic molded article using the foregoing resin, which exhibits excellent moldability, durability and barrier properties and has an excellent balance between impact resistance and stiffness, are provided. The polyethylene based resin satisfies the following requirements (1) to (4): (1) a high-load melt flow rate (HLMFR) is from 1 to 100 g/10 min; (2) a density is from 0.940 to 0.960 g/cm3; (3) a strain hardening parameter ?max of elongational viscosity is from 1.05 to 1.50; and (4) a rupture time in a full notch tensile creep test and a density satisfy the following relational expression (A): log(rupture time)??355×(density)+337.6(A).

Abstract: The invention is a polyacetal resin composition containing a polyacetal resin (A) and a polyethylene resin (B), in which the blending proportion of the polyacetal resin (A) occupying in the total mass of the polyacetal resin (A) and the polyethylene resin (B) is 10 to 90 mass %, the melt flow rate of the polyacetal resin (A) measured at a condition of 190° C. and 2.16 kg load is 30 g/10 minutes or less, and the polyethylene resin (B) consists of a modified polyethylene resin and the modification rate is 0.01 mass % or more based on 100 mass % of the total mass of the polyethylene resin and the melt flow rate of the polyethylene resin (B) measured at a condition of 190° C. and 2.16 kg load is 2.5 g/10 minutes or less.

Abstract: The present invention is to provide a polyethylene resin composition for container closures and a container closure exhibiting excellent mouldability, high flowability, excellent balance between rigidity and impact resistance, excellent stress cracking resistance, excellent sliding property, low odour level, harmlessness for food, decreased elongation at high temperatures and sterilizability by electron beam upon attachment of the closure to a container. The present invention is a polyethylene resin composition for a container closure, this composition having, relative to 100 parts by weight of a polyethylene resin, 0.01 to 0.50 parts by weight of a hindered amine compound and having the following properties (a) to (f): (a) a melt flow rate (MFR) of 0.5 to 10 g/10 min, a melt flow rate (HLMFR) of 100 to 500 g/10 min and HLMFR/MFR of 50 to 200; (b) a density of 0.956 to 0.

Abstract: The present invention relates to a polar group-containing olefin copolymer (A?) which is produced through polymerization using a transition metal catalyst, which has a weight-average molecular weight falling within a specific range and which contains a polar group-containing monomer within a specific range; a multinary polar olefin copolymer (A?) indispensably containing a polar monomer component that has a norbornene skeleton and a carboxyl group or an acid anhydride group and having three or more types of monomer units; and a resin composition (C) containing a specific amount of a polar group-containing olefin copolymer (A) and a specific amount of an olefin resin (B).

Abstract: An object of the present invention is to provide a polyethylene-based resin composition excellent in the moldability and at the same time, excellent in the balance between impact strength and stiffness as well as in the transparency, and a molded product and a film, which are obtained by the molding of the polyethylene-based resin composition. The polyethylene-based resin composition of the present invention comprises from 41 to 99 wt % of (A) an ethylene-based polymer satisfying specific conditions and from 1 to 59 wt % of (B) an ethylene-based polymer satisfying specific conditions, wherein MFR of the composition as a whole is from 0.05 to 50 g/10 min and the density is from 0.910 to 0.960 g/cm3.

Abstract: A resin composition for a solar cell encapsulant is provided, containing an ethylene•?-olefin copolymer and an organic peroxide or a silane coupling agent or the like, and having superior heat resistance, transparency, flexibility and adhesion property to a glass substrate, as well as good balance between rigidity and cross-linking efficiency, as well as a solar cell encapsulant, and a solar cell module using the same. The resin composition has an ethylene•?-olefin copolymer (A), having the characteristics (a1) to (a4), along with characteristics (a5) or (a6), and an organic peroxide (B) and/or a silane coupling agent (C).

Abstract: An object of the invention is to provide an ethylene-based polymer excellent in moldability and durability, and also excellent in the balance of stiffness and durability, and to provide a molded product of hollow plastic using the ethylene-based polymer. The ethylene-based polymer according to the invention is an ethylene-based polymer having specific characteristics and manufactured by a homopolymerization of ethylene or a copolymerization of ethylene and ?-olefin using a chromium catalyst.

Abstract: A novel catalyst component for producing a crystalline ?-olefin polymer or ?-olefin/(meth)acrylate copolymer having few branches, especially a polymer having a high molecular weight, and a method for producing an ?-olefin polymer or an ?-olefin/(meth)acrylate copolymer using the catalyst component. A metal complex represented by the following general formula (D), as well as a method for producing an ?-olefin polymer and a method for producing an ?-olefin/(meth)acrylate copolymer using the metal complex.

Abstract: A welding material, comprising a modified polyethylene resin composition (Z) comprising from 0.5 to 95 wt % of a modified polyethylene resin (X) having at least one monomer selected from the group consisting of an unsaturated carboxylic acid and its derivative, grafted to a polyethylene resin (A) having a density of from 0.910 to 0.965 g/cm3 and a MFR (temperature: 190° C., load: 2.16 kg) of from 0.1 to 5.0 g/10 min, and from 5 to 99.5 wt % of an unmodified polyethylene resin (Y) having a density of from 0.930 to 0.965 g/cm3, a MFR of from 0.01 to 5.0 g/10 min and a melt flow rate ratio (HL-MFR (temperature: 190° C., load: 21.6 kg)/MFR of from 40 to 270, and having a density of from 0.938 to 0.965 g/cm3 and a MFR of from 0.05 to 1.0 g/10 min.

Abstract: A solar cell encapsulant used the resin component containing an ethylene.?-olefin copolymer and a copolymer of ethylene-a functional group-containing monomer, having good productivity, superior transparency, and also superior modulus of elasticity in tension, heat resistance, adhesive property and steam transmittance resistance, and the solar cell module using the same. It is provided by the solar cell encapsulant, characterized by using a resin composition comprising a component (A) and a component (B), satisfying the following formula (x), as resin components, or the like: (a1) a density of 0.860 to 0.920 g/cm3 ?480×[d]+425?[CM]??480×[d]+433??Expression (x) (wherein [d] represents density of the component (A); and [CM] represents comonomer content (mol %) of the component (B)).

Abstract: A resin composition for a solar cell encapsulant containing an ethylene.?-olefin copolymer and an organic peroxide or a silane coupling agent or the like, and having superior heat resistance, transparency, flexibility and adhesion property to a glass substrate, as well as good balance between rigidity and cross-linking efficiency, the solar cell encapsulant and a solar cell module using the same. It is provided by a resin composition for the solar cell encapsulant characterized by containing the ethylene.?-olefin copolymer (A) having the characteristics of the following (a1) to (a5), and the organic peroxide (B) and/or the silane coupling agent (C). (a1) a density of 0.860 to 0.920 g/cm3 (a2) a ratio, (Mz/Mn), of Z average molecular weight (Mz) and number average molecular weight (Mn) determined by a gel permeation chromatography (GPC), of 8.0 or less (a3) a melt viscosity (?*1) measured at 100° C. under a shear rate of 2.43×10 s?1 of 1.2×105 poise or more (a4) a melt viscosity (?*2) measured at 100° C.

Abstract: A polyethylene based resin exhibiting excellent moldability and durability and having an excellent balance between impact resistance and stiffness; and a hollow plastic molded article using the foregoing resin, which exhibits excellent moldability, durability and barrier properties and has an excellent balance between impact resistance and stiffness, are provided. The polyethylene based resin satisfies the following requirements (1) to (4): (1) a high-load melt flow rate (HLMFR) is from 1 to 100 g/10 min; (2) a density is from 0.940 to 0.960 g/cm3; (3) a strain hardening parameter ?max of elongational viscosity is from 1.05 to 1.50; and (4) a rupture time in a full notch tensile creep test and a density satisfy the following relational expression (A): log (rupture time)??355×(density)+337.6 (A).

Abstract: A resin composition for a solar cell encapsulant is provided, containing an ethylene•?-olefin copolymer and an organic peroxide or a silane coupling agent or the like, and having superior heat resistance, transparency, flexibility and adhesion property to a glass substrate, as well as good balance between rigidity and cross-linking efficiency, as well as a solar cell encapsulant, and a solar cell module using the same. The resin composition has an ethylene•?-olefin copolymer (A), having the characteristics (a1) to (a4), along with characteristics (a5) or (a6), and an organic peroxide (B) and/or a silane coupling agent (C).

Abstract: To provide an industrially useful ?-olefin.((meth)acrylic acid)-based olefin copolymer having both a high molecular weight and a high comonomer content, a catalyst component capable of realizing a production of two different kinds of ?-olefin.((meth)acrylic acid)-based olefin copolymers, and a production process using the catalyst. An ?-olefin.((meth)acrylic acid)-based olefin copolymer is produced by using a metal complex complexed with a ligand represented by the following formula (Y is phosphorus or arsenic) for a catalyst composition.

Abstract: A novel catalyst component for producing a crystalline ?-olefin polymer or ?-olefin/(meth)acrylate copolymer having few branches, especially a polymer having a high molecular weight, and a method for producing an ?-olefin polymer or an ?-olefin/(meth)acrylate copolymer using the catalyst component. A metal complex represented by the following general formula (D), as well as a method for producing an ?-olefin polymer and a method for producing an ?-olefin/(meth)acrylate copolymer using the metal complex.

Abstract: A permeation-preventive member and a multilayered container for fuel tank employing the permeation-preventive member, the permeation-preventive member is for preventing a permeation of hydrocarbon compound by fusion-bonding the member to a discontinuous part of the permeation-preventive layer in a multilayered container for fuel tank which comprises an inner polyolefin resin layer, an outer polyolefin resin layer and a permeation-preventive layer as an interlayer, wherein the permeation-preventive member comprises a metal sheet or foil and an adhesive resin layer comprising a modified polyolefin that satisfies the following requirements (a) to (e): (a) the melt flow rate as measured at a temperature of 190° C. under a load of 2.16 kg is 0.1-100 g/10 min; (b) the density is 0.910-0.965 g/cm3; (c) the initial adhesive strength to the metal sheet or foil is 0.1 kg/10 mm or higher; (d) the adhesive strength to the metal sheet or foil as measured after 2,500-hour immersion at 65° C.

Abstract: An easy-to-tear laminate is provided which is satisfactory in tearability and heat-sealing strength and excellent in ease of opening and contents-protecting performance. The laminate comprises a base layer and a layer comprising 10-95% by weight specific ethylene-based terpolymer (A) and 5-90% by weight specific low-density polyethylene (B) produced by the high-pressure radical polymerization method.

Abstract: The invention relates to a polyethylene resin having excellent slow crack growth property, in particular a resin having excellent durability in a pipe application, which has a specific (a) high-load melt flowrate (HLMFR; HLa), a specific (b) density (Da), and a specific (c) ?-olefin content (Ca) and in which (d) a breaking time (T) measured by notched Lander ESCR, the HLa, and the Ca satisfy log T??2.9×log HLa+5.1×log Ca+6.8. It further relates to a process for producing the resin and to a pipe and a joint each comprising the resin.

Abstract: A method for producing an ethylene polymer which comprises continuously polymerizing ethylene alone or copolymerizing ethylene and a C3-C8 ?-olefin by multistage polymerization in a plurality of polymerization reactors connected in series in the presence of a chromium catalyst having at least a part of chromium atoms converted to hexavalent chromium carried on an inorganic oxide carrier by calcination-activating in a non-reducing atmosphere, wherein an organoaluminum compound of the formula (1): (R1)xAl(OR2)y(OSiR3R4R5)z??(1) (in the above formula, R1 and R2 may be the same or different, each represents a C1-C18 alkyl group or a C6-C18 aryl group, R3, R4 and R5 may be the same or different, each represents a C1-C18 alkyl group or a C6-C18 aryl group, R1, OR2 and OSiR3R4R5 respectively may be the same or different when each has a plurality of kinds, and x, y and z are respectively 0?x?3, 0?y<3, 0?z<3, and x+y+z=3) is introduced at least one or all of the polymerization reactors.