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AssigneeJapan Polyethylene Corporation
InventorsYuuichi Kuzuba, Takashi Monoi, Ritsuya Matsumoto, Kouichi Ogawa, Satoshi Kanazawa, Takaaki Hattori
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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 λmax 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).
A polyethylene based resin satisfying the following requirements (1) to (4):
A polyethylene based resin-producing catalyst comprising a chromium catalyst having a chromium compound supported on an inorganic oxide carrier, wherein at least a part of chromium atoms is a hexavalent chromium atom, and an organoaluminum compound is present concentrated on the surface of the inorganic oxide carrier.
A method for producing a polyethylene based resin, comprising homopolymerizing ethylene or copolymerizing ethylene and an α-olefin using a chromium catalyst supporting an organoaluminum compound, wherein the organoaluminum compound-supported chromium catalyst is one obtained by supporting a chromium compound on an inorganic oxide carrier having a specific surface area of from 250 to 800 m2/g and a pore volume of from 0.5 to 3.0 cm3/g;
Dependencies are inferred from the claim text.