Japan Polyethylene Corporation

Japan Polyolefins Co., Ltd.

Satoshi Kanazawa

Takashi Monoi

Kouichi Ogawa

Yuuichi Kuzuba

Koichi Ogawa

Takaaki Hattori

Keiichi Yoshimoto

Osamu Miyachi

Ritsuya Matsumoto

Daizo Tabuchi

Kei Takahashi

Haruhiko Kondou

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 &#x3b1;-olefin using a chromium catalyst.

Ethylene-based polymer, manufacturing method of ethylene-based polymer and manufacturing method of catalyst for polymerization, and molded article of hollow plastics containing ethylene-based polymer and use thereof

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/cm; (3) a strain hardening parameter &#x3bb;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)&#x2267;&#x2212;355&#xd7;(density)+337.6(A).

Polyethylene based resin, producing catalyst for the same, method for producing the same, hollow plastic molded article containing polyethylene based resin, and use of the same

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):

Permeation-inhibiting members and multi-layer containers made by using the same

Ethylene (co)polymers each having specified values of (a) density, (b) molecular weight distribution (Mw/Mn), (c) relationship between die swell (DS) and shear rate (&ggr;) in a region of shear rate ({dot over (&ggr;)}), (d) relationship between stress (&sgr;) and maximum stress (&sgr; max) in a stress-strain curve in uniaxial stretching, (e) the ratio of sample diameter to initial sample diameter and the time for sample breakage during uniaxial stretching under a constant tension, blow molding process in which the thickness of a parison is adjusted by using the said ethylene (co)polymer, and the method of improving fire resistance in moldings, laminates and hollow moldings made by using the same. The ethylene (co)polymers are excellent in drawdown resistance, puncture resistance, parison control response, pinch-off properties, durability, and fire resistance, by using it, parison thickness can be controlled freely in blow molding, and large blow moldings having complicated shapes excellent in durability and fire resistance can be obtained.

Ethylene (co) polymers, and laminate and hollow molding made by using the same

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Kanagawa, Japan

Satoshi Kanazawa