Japan Polyethylene Corporation

Japan Polychem Corporation

Japan Polypropylene Corporation

Yoshiyuki Ishihama

Masaru Aoki

Tsutomu Sakuragi

Kazuya Sakata

Tetsurou Fukuda

Keiichi Yoshimoto

Ryousuke Asakawa

Kenji Kawagishi

Toshihiko Sugano

Hiroto Hayashi

Kazushi Kodama

Kenji Iiba

Ryotaro Harada

Hideshi Uchino

Hiroshi Nakano

Takao Tayano

Kuninori Takahashi

Masato Nakano

Kazuo Asuka

Etsushi Akashige

Masayuki Yamazaki

Masaaki Ito

Fumiyo Ikehata

Fusaaki Katou

Kou Obata

Shuuichi Toriu

Hirotugu Niwa

Hisao Uchida

Mikio Kawase

Masafumi Shimizu

Akihira Watanabe

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/cm.

Ethylene-based polymer, polyethylene-based resin composition and use thereof, catalyst component for olefin polymerization, olefin polymerization catalyst containing the component, and method for producing ethylene-based polymer by using the catalyst

The metallocene compound represented by the following general formula (1): (the numerals and signs in the general formula (1) are as described in the description).

Metallocene compound, catalyst component for olefin polymerization and catalyst for olefin polymerization containing the same, and method for producing olefin polymer using catalyst for olefin polymerization

[Problem] To provide an ethylene-&#x3b1;-olefin copolymer that is highly effective in improving the molding properties of polyolefin resins, improving the balance between impact strength and stiffness, and improving transparency. [Solution] Provided is an ethylene-&#x3b1;-olefin copolymer having a specific MFR, a specific density, and a specific molecular weight distribution, containing a suitable amount of a long-chain branching structure characterized by a branching index, and having a specific composition distribution structure characterized by solvent fractionation behavior.

Ethylene-&#x3b1;-olefin copolymer and olefin resin composition

[Problem] To provide an ethylene-&#x3b1;-olefin copolymer that is highly effective in improving the molding properties of polyolefin resins and at the same time highly effective improving the balance between impact strength and stiffness. [Solution] Provided is an ethylene-&#x3b1;-olefin copolymer having a specific MFR, a specific density, and a specific molecular weight distribution, containing a suitable amount of a long-chain branching structure characterized by a branching index, and having a specific composition distribution structure characterized by solvent fractionation behavior.

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 % (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/cm.

[Problem] To provide an ethylene-&#x3b1;-olefin copolymer having high mechanical strength and good molding properties. [Solution] Provided is an ethylene-&#x3b1;-olefin copolymer having a specific MFR, a specific density, and a specific molecular weight distribution, containing a suitable amount of a long-chain branching structure characterized by a branching index, and having a specific composition distribution structure characterized by solvent fractionation behavior.

A propylene-based polymer which is suitably applicable to foam molding, sheet molding, blow molding or the like, because of having good flow characteristics, high melt tension, high swell ratio and thus good molding workability. It is attained by a propylene-based polymer or the like characterized by satisfying the following requirements (i) to (vi). Requirement (i): MFR is 0.1 g/10 minutes to 100 g/10 minutes. Requirement (ii): Q value by GPC is 3.5 to 10.5. Requirement (iii): ratio of components with a molecular weight of equal to or higher than 2,000,000, in a molecular weight distribution curve obtained by GPC, is equal to or larger than 0.4% by weight and less than 10% by weight. Requirement (iv): components, which elute at a temperature of equal to or lower than 40&#xb0; C., are equal to or less than 3.0% by weight, in temperature rising elution fractionation by ODCB. Requirement (v): isotactic triad fraction (mm) measured withC-NMR is equal to or higher than 95%. Requirement (vi): strain hardening degree (&#x3bb;max), in measurement of extensional viscosity, is equal to or higher than 6.0.

Propylene-based polymer, production method therefor, composition using the same, and application thereof

An ethylene polymer excellent in molding processability represented by uniform extensibility, drawdown resistance, swell and extrudability, and mechanical properties represented by rigidity, impact resistance and ESCR, is provided. Particularly, an ethylene polymer remarkably excelent in balance between rigidity and ESCR as compared with a conventionally known ethylene polymer is provided. An ethylene polymer, which is an ethylene homopolymer or a copolymer of ethylene with an &#x3b1;-olefin having a carbon number of from 3 to 20, and which satisfies the following conditions (1) to (4): (1) the melt index (HLMI) under a load of 21.6 kg at 190&#xb0; C. is from 0.1 to 1000 g/10 min, (2) the density (d) is from 0.935 to 0.985 g/cm, (3) the relation between HLMI and d satisfies the following formula (i): d&#x2267;0.00900&#xd7;log(HLMI)+0.951, (4) the relation between ESCR and the flexural modulus (M) satisfies the following formula (ii): M&#x2267;&#x2212;7310&#xd7;log(ESCR)+32300.

Ethylene polymers

The present invention provides a catalyst for olefin polymerization having high olefin polymerization activity without being accompanied by generation of an adhered polymer on the wall of a polymerization reactor and the wall of pipe line and generation of a locking massive polymer, and capable of manufacturing an olefin polymer industrially and stably for a long period of time. That is, the present invention related to a catalyst for olefin polymerization comprising [A1] a hafnium compound or a zirconium compound having at least one conjugated 5-membered ring ligand, [A2] a zirconium compound having at least one conjugated 5-membered ring ligand but different from [A1], and [B] phyllosilicate, and relates to a method of polymerizing or copolymerizing olefin in the presence of the catalyst.

Catalyst for olefin polymerization and method of polymerization of olefin

Component of catalyst for olefin polymerization

An ethylene/&agr;-olefin copolymer having a density of 0.900 to 0.965 g/cm ; having an MI of 0.01 to 100 g/10 minutes; in a chromatogram with the use of Rayleigh ratio obtained by extrapolating GPC-MALLS data at a scattering angle of 0&deg;, showing an average {overscore (Mc)} obtained by measuring five times of 0.5% or more and a standard deviation <&sgr;> from the average of 35% or less, wherein Mc stands for the chromatographic area ratio of the components having molecular weight of 1,000,000 or more calculated on the basis of the above measurement; and having a W30 (weight fraction of the portion eluted below 30&deg; C.) in CFC measurement of 1 (% by weight) or less; and a film thereof.

Ethylene/&agr;-olefin copolymer and film made thereof

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Mie, Japan

Yoshiyuki Ishihama